Move Experimental Discord plugin into master (#1843)

Since the discord branch is being used in production by many projects (MetaGame, AraCred, RaidGuild, etc), and we also want to start using it for SourceCred, it would be a good idea to merge it into master in a separate experimental-discord plugin so the proper discord plugin can be developed in parallel while allowing the other projects to stay up to date with master. paired with @decentralion
2025-02-27 11:40:26 +00:00 · 2020-06-08 01:00:25 -06:00 · 2020-06-08 01:00:25 -06:00 · a38860a3d2
commit a38860a3d2
parent 1abed5f0ed
47 changed files with 3749 additions and 26 deletions
--- a/sharness/snapshots/example-github-load/projects/c291cmNlY3JlZC10ZXN0L2V4YW1wbGUtZ2l0aHVi/project.json
+++ b/sharness/snapshots/example-github-load/projects/c291cmNlY3JlZC10ZXN0L2V4YW1wbGUtZ2l0aHVi/project.json
@ -1 +1 @@
-[{"type":"sourcecred/project","version":"0.5.1"},{"discourseServer":null,"id":"sourcecred-test/example-github","identities":[],"initiatives":null,"repoIds":[{"name":"example-github","owner":"sourcecred-test"}],"timelineCredParams":null}]
+[{"type":"sourcecred/project","version":"0.5.2"},{"discord":null,"discourseServer":null,"id":"sourcecred-test/example-github","identities":[],"initiatives":null,"repoIds":[{"name":"example-github","owner":"sourcecred-test"}],"timelineCredParams":null}]
--- a/src/api/load.js
+++ b/src/api/load.js
@ -4,6 +4,7 @@ import {type Project} from "../core/project";
 import {type Weights as WeightsT} from "../core/weights";
 import {type PluginDeclaration} from "../analysis/pluginDeclaration";
 import {type TimelineCredParameters} from "../analysis/timeline/params";
+import {type DiscordToken} from "../plugins/experimental-discord/params";
 import {type GithubToken} from "../plugins/github/token";
 import {type CacheProvider} from "../backend/cache";
 import {DataDirectory} from "../backend/dataDirectory";
@ -17,6 +18,7 @@ export type LoadOptions = {|
  +plugins: $ReadOnlyArray<PluginDeclaration>,
  +sourcecredDirectory: string,
  +githubToken: ?GithubToken,
+  +discordToken: ?DiscordToken,
  +initiativesDirectory: ?string,
 |};

@ -30,6 +32,7 @@ export async function load(
  const {
    sourcecredDirectory,
    githubToken,
+    discordToken,
    project,
    params,
    weightsOverrides,
@ -39,6 +42,7 @@ export async function load(
  const context = new LoadContext({
    cache: (data: CacheProvider),
    githubToken,
+    discordToken,
    reporter,
    initiativesDirectory,
  });
--- a/src/backend/loadContext.js
+++ b/src/backend/loadContext.js
@ -6,6 +6,7 @@ import {type WeightedGraph as WeightedGraphT} from "../core/weightedGraph";
 import * as WeightedGraph from "../core/weightedGraph";
 import {type TimelineCredParameters} from "../analysis/timeline/params";
 import {type GithubToken} from "../plugins/github/token";
+import {type DiscordToken} from "../plugins/experimental-discord/params";
 import {type CacheProvider} from "./cache";
 import {TaskReporter} from "../util/taskReporter";
 import {TimelineCred} from "../analysis/timeline/timelineCred";
@ -14,8 +15,9 @@ import {type PluginLoaders as PluginLoadersT} from "./pluginLoaders";
 import * as ComputeFunction from "./computeFunction";
 import * as PluginLoaders from "./pluginLoaders";
 import {default as githubLoader} from "../plugins/github/loader";
-import {default as identityLoader} from "../plugins/identity/loader";
+import {default as discordLoader} from "../plugins/experimental-discord/loader";
 import {default as discourseLoader} from "../plugins/discourse/loader";
+import {default as identityLoader} from "../plugins/identity/loader";
 import {default as initiativesLoader} from "../plugins/initiatives/loader";
 import {type PluginDeclarations} from "../analysis/pluginDeclaration";

@ -29,6 +31,7 @@ export type LoadContextOptions = {|
  +cache: CacheProvider,
  +reporter: TaskReporter,
  +githubToken: ?GithubToken,
+  +discordToken: ?DiscordToken,
  +initiativesDirectory: ?string,
 |};

@ -84,6 +87,7 @@ export class LoadContext {
  +_compute: ComputeFunctionT = TimelineCred.compute;
  +_pluginLoaders: PluginLoadersT = {
    github: githubLoader,
+    discord: discordLoader,
    discourse: discourseLoader,
    identity: identityLoader,
    initiatives: initiativesLoader,
--- a/src/backend/loadContext.test.js
+++ b/src/backend/loadContext.test.js
@ -70,6 +70,7 @@ const mockProxyMethods = (
 describe("src/backend/loadContext", () => {
  describe("LoadContext", () => {
    const githubToken = validateToken("0".repeat(40));
+    const discordToken = "fakeBotToken";
    const project = createProject({id: "testing-project"});
    const params = {alpha: 0.123};
    const initiativesDirectory = fakes.initiativesDirectory;
@ -90,6 +91,7 @@ describe("src/backend/loadContext", () => {
        const loadContext = new LoadContext({
          cache,
          githubToken,
+          discordToken,
          reporter,
          initiativesDirectory,
        });
@ -121,6 +123,7 @@ describe("src/backend/loadContext", () => {
        const loadContext = new LoadContext({
          cache,
          githubToken,
+          discordToken,
          reporter,
          initiativesDirectory,
        });
@ -134,6 +137,7 @@ describe("src/backend/loadContext", () => {
        const expectedEnv = {
          initiativesDirectory,
          githubToken,
+          discordToken,
          reporter,
          cache,
        };
@ -183,6 +187,7 @@ describe("src/backend/loadContext", () => {
        const loadContext = new LoadContext({
          cache,
          githubToken,
+          discordToken,
          reporter,
          initiativesDirectory,
        });
@ -195,6 +200,7 @@ describe("src/backend/loadContext", () => {
        const expectedEnv = {
          initiativesDirectory,
          githubToken,
+          discordToken,
          reporter,
          cache,
        };
@ -219,6 +225,7 @@ describe("src/backend/loadContext", () => {
        const loadContext = new LoadContext({
          cache,
          githubToken,
+          discordToken,
          reporter,
          initiativesDirectory,
        });
--- a/src/backend/pluginLoaders.js
+++ b/src/backend/pluginLoaders.js
@ -7,9 +7,11 @@ import * as WeightedGraph from "../core/weightedGraph";
 import {type PluginDeclaration} from "../analysis/pluginDeclaration";
 import {type CacheProvider} from "./cache";
 import {type GithubToken} from "../plugins/github/token";
+import {type DiscordToken} from "../plugins/experimental-discord/params";
 import {type Loader as GithubLoader} from "../plugins/github/loader";
-import {type Loader as IdentityLoader} from "../plugins/identity/loader";
+import {type Loader as DiscordLoader} from "../plugins/experimental-discord/loader";
 import {type Loader as DiscourseLoader} from "../plugins/discourse/loader";
+import {type Loader as IdentityLoader} from "../plugins/identity/loader";
 import {type Loader as InitiativesLoader} from "../plugins/initiatives/loader";
 import {type LoadedInitiativesDirectory} from "../plugins/initiatives/initiativesDirectory";
 import {
@ -25,6 +27,7 @@ import {
 */
 export type PluginLoaders = {|
  +github: GithubLoader,
+  +discord: DiscordLoader,
  +discourse: DiscourseLoader,
  +identity: IdentityLoader,
  +initiatives: InitiativesLoader,
@ -52,19 +55,21 @@ opaque type PluginGraphs = {|
 type MirrorEnv = {
  +initiativesDirectory: ?string,
  +githubToken: ?GithubToken,
+  +discordToken: ?DiscordToken,
  +reporter: TaskReporter,
  +cache: CacheProvider,
 };

 type GraphEnv = {
  +githubToken: ?GithubToken,
+  +discordToken: ?DiscordToken,
 };

 /**
 * Gets all relevant PluginDeclarations for a given Project.
 */
 export function declarations(
-  {github, discourse, identity, initiatives}: PluginLoaders,
+  {github, discourse, discord, identity, initiatives}: PluginLoaders,
  project: Project
 ): $ReadOnlyArray<PluginDeclaration> {
  const plugins: PluginDeclaration[] = [];
@ -74,6 +79,9 @@ export function declarations(
  if (project.discourseServer != null) {
    plugins.push(discourse.declaration());
  }
+  if (project.discord != null) {
+    plugins.push(discord.declaration());
+  }
  if (project.identities.length) {
    plugins.push(identity.declaration());
  }
@ -87,8 +95,8 @@ export function declarations(
 * Updates all mirrors into cache as requested by the Project.
 */
 export async function updateMirror(
-  {github, discourse, initiatives}: PluginLoaders,
-  {githubToken, cache, reporter, initiativesDirectory}: MirrorEnv,
+  {github, discourse, discord, initiatives}: PluginLoaders,
+  {githubToken, discordToken, cache, reporter, initiativesDirectory}: MirrorEnv,
  project: Project
 ): Promise<CachedProject> {
  const tasks: Promise<void>[] = [];
@ -105,6 +113,14 @@ export async function updateMirror(
      github.updateMirror(project.repoIds, githubToken, cache, reporter)
    );
  }
+  if (project.discord) {
+    if (!discordToken) {
+      throw new Error("Tried to load Discord, but no Discord bot token set");
+    }
+    tasks.push(
+      discord.updateMirror(project.discord, discordToken, cache, reporter)
+    );
+  }

  let loadedInitiativesDirectory: ?LoadedInitiativesDirectory;
  if (project.initiatives) {
@ -160,8 +176,8 @@ export async function createReferenceDetector(
 * Creates PluginGraphs containing all plugins requested by the Project.
 */
 export async function createPluginGraphs(
-  {github, discourse, initiatives}: PluginLoaders,
-  {githubToken}: GraphEnv,
+  {github, discourse, discord, initiatives}: PluginLoaders,
+  {githubToken, discordToken}: GraphEnv,
  {cache, project, loadedInitiativesDirectory}: CachedProject,
  referenceDetector: ReferenceDetector
 ): Promise<PluginGraphs> {
@ -177,6 +193,12 @@ export async function createPluginGraphs(
    }
    tasks.push(github.createGraph(project.repoIds, githubToken, cache));
  }
+  if (project.discord) {
+    if (!discordToken) {
+      throw new Error("Tried to load Discord, but no Discord bot token set");
+    }
+    tasks.push(discord.createGraph(project.discord, cache));
+  }

  if (loadedInitiativesDirectory) {
    tasks.push(
--- a/src/backend/pluginLoaders.test.js
+++ b/src/backend/pluginLoaders.test.js
@ -22,6 +22,7 @@ export function createWG(name: string) {

 const mockGraphs = {
  github: createWG("github"),
+  discord: createWG("discord"),
  discourse: createWG("discourse"),
  initiatives: createWG("initiatives"),
  contracted: createWG("identity-contracted"),
@ -29,6 +30,7 @@ const mockGraphs = {

 const fakes = {
  githubDeclaration: ({fake: "githubDeclaration"}: any),
+  discordDeclaration: ({fake: "discordDeclaration"}: any),
  githubReferences: ({fake: "githubReferences"}: any),
  discourseDeclaration: ({fake: "discourseDeclaration"}: any),
  discourseReferences: ({fake: "discourseReferences"}: any),
@ -59,6 +61,11 @@ const mockPluginLoaders = () => ({
    referenceDetector: jest.fn().mockResolvedValue(fakes.githubReferences),
    createGraph: jest.fn().mockResolvedValue(mockGraphs.github),
  },
+  discord: {
+    declaration: jest.fn().mockReturnValue(fakes.discordDeclaration),
+    updateMirror: jest.fn(),
+    createGraph: jest.fn().mockResolvedValue(mockGraphs.discord),
+  },
  discourse: {
    declaration: jest.fn().mockReturnValue(fakes.discourseDeclaration),
    updateMirror: jest.fn(),
@ -149,6 +156,7 @@ describe("src/backend/pluginLoaders", () => {
      const cache = mockCacheProvider();
      const reporter = new TestTaskReporter();
      const githubToken = null;
+      const discordToken = null;
      const initiativesDirectory = null;
      const project = createProject({
        id: "has-discourse",
@ -158,7 +166,7 @@ describe("src/backend/pluginLoaders", () => {
      // When
      await PluginLoaders.updateMirror(
        loaders,
-        {githubToken, cache, reporter, initiativesDirectory},
+        {githubToken, discordToken, cache, reporter, initiativesDirectory},
        project
      );

@ -177,6 +185,7 @@ describe("src/backend/pluginLoaders", () => {
      const loaders = mockPluginLoaders();
      const cache = mockCacheProvider();
      const githubToken = null;
+      const discordToken = null;
      const initiativesDirectory = null;
      const reporter = new TestTaskReporter();
      const project = createProject({
@ -187,7 +196,7 @@ describe("src/backend/pluginLoaders", () => {
      // When
      const p = PluginLoaders.updateMirror(
        loaders,
-        {githubToken, cache, reporter, initiativesDirectory},
+        {githubToken, discordToken, cache, reporter, initiativesDirectory},
        project
      );

@ -203,6 +212,7 @@ describe("src/backend/pluginLoaders", () => {
      const cache = mockCacheProvider();
      const reporter = new TestTaskReporter();
      const githubToken = null;
+      const discordToken = null;
      const initiativesDirectory = __dirname;
      const project = createProject({
        id: "has-initiatives",
@ -212,7 +222,7 @@ describe("src/backend/pluginLoaders", () => {
      // When
      await PluginLoaders.updateMirror(
        loaders,
-        {githubToken, cache, reporter, initiativesDirectory},
+        {githubToken, discordToken, cache, reporter, initiativesDirectory},
        project
      );

@ -233,6 +243,7 @@ describe("src/backend/pluginLoaders", () => {
      const loaders = mockPluginLoaders();
      const cache = mockCacheProvider();
      const githubToken = null;
+      const discordToken = null;
      const initiativesDirectory = null;
      const reporter = new TestTaskReporter();
      const project = createProject({
@ -243,7 +254,7 @@ describe("src/backend/pluginLoaders", () => {
      // When
      const p = PluginLoaders.updateMirror(
        loaders,
-        {githubToken, cache, reporter, initiativesDirectory},
+        {githubToken, discordToken, cache, reporter, initiativesDirectory},
        project
      );

@ -258,6 +269,7 @@ describe("src/backend/pluginLoaders", () => {
      const loaders = mockPluginLoaders();
      const cache = mockCacheProvider();
      const githubToken = exampleGithubToken;
+      const discordToken = null;
      const reporter = new TestTaskReporter();
      const initiativesDirectory = null;
      const project = createProject({
@ -268,7 +280,7 @@ describe("src/backend/pluginLoaders", () => {
      // When
      await PluginLoaders.updateMirror(
        loaders,
-        {githubToken, cache, reporter, initiativesDirectory},
+        {githubToken, discordToken, cache, reporter, initiativesDirectory},
        project
      );

@ -291,6 +303,7 @@ describe("src/backend/pluginLoaders", () => {
      const loaders = mockPluginLoaders();
      const cache = mockCacheProvider();
      const githubToken = null;
+      const discordToken = null;
      const project = createProject({
        id: "has-discourse",
        discourseServer: {serverUrl: "http://foo.bar"},
@ -300,7 +313,7 @@ describe("src/backend/pluginLoaders", () => {
      // When
      const pluginGraphs = await PluginLoaders.createPluginGraphs(
        loaders,
-        {githubToken},
+        {githubToken, discordToken},
        cachedProject,
        references
      );
@ -325,6 +338,7 @@ describe("src/backend/pluginLoaders", () => {
      const cache = mockCacheProvider();
      const loadedInitiativesDirectory = mockLoadedDirectory();
      const githubToken = null;
+      const discordToken = null;
      const project = createProject({
        id: "has-initiatives",
        initiatives: {remoteUrl: "http://example.com/initiatives"},
@ -334,7 +348,7 @@ describe("src/backend/pluginLoaders", () => {
      // When
      const pluginGraphs = await PluginLoaders.createPluginGraphs(
        loaders,
-        {githubToken},
+        {githubToken, discordToken},
        cachedProject,
        references
      );
@ -358,6 +372,7 @@ describe("src/backend/pluginLoaders", () => {
      const loaders = mockPluginLoaders();
      const cache = mockCacheProvider();
      const githubToken = null;
+      const discordToken = null;
      const project = createProject({
        id: "has-github",
        repoIds: [exampleRepoId],
@ -367,7 +382,7 @@ describe("src/backend/pluginLoaders", () => {
      // When
      const p = PluginLoaders.createPluginGraphs(
        loaders,
-        {githubToken},
+        {githubToken, discordToken},
        cachedProject,
        references
      );
@ -384,6 +399,7 @@ describe("src/backend/pluginLoaders", () => {
      const loaders = mockPluginLoaders();
      const cache = mockCacheProvider();
      const githubToken = exampleGithubToken;
+      const discordToken = null;
      const project = createProject({
        id: "has-github",
        repoIds: [exampleRepoId],
@ -393,7 +409,7 @@ describe("src/backend/pluginLoaders", () => {
      // When
      const pluginGraphs = await PluginLoaders.createPluginGraphs(
        loaders,
-        {githubToken},
+        {githubToken, discordToken},
        cachedProject,
        references
      );
@ -419,6 +435,7 @@ describe("src/backend/pluginLoaders", () => {
      const loaders = mockPluginLoaders();
      const cache = mockCacheProvider();
      const githubToken = exampleGithubToken;
+      const discordToken = null;
      const loadedInitiativesDirectory = mockLoadedDirectory();
      const project = createProject({
        id: "has-github-discourse-initiatives",
@ -431,7 +448,7 @@ describe("src/backend/pluginLoaders", () => {
      // When
      const references = await PluginLoaders.createReferenceDetector(
        loaders,
-        {githubToken},
+        {githubToken, discordToken},
        cachedProject
      );

--- a/src/cli/common.js
+++ b/src/cli/common.js
@ -7,6 +7,7 @@ import deepFreeze from "deep-freeze";
 import fs from "fs-extra";
 import {type Weights, fromJSON as weightsFromJSON} from "../core/weights";
 import {validateToken, type GithubToken} from "../plugins/github/token";
+import {type DiscordToken} from "../plugins/experimental-discord/params";

 export type PluginName = "git" | "github";

@ -33,6 +34,10 @@ export function githubToken(): ?GithubToken {
  return validateToken(envToken);
 }

+export function discordToken(): ?DiscordToken {
+  return process.env.SOURCECRED_DISCORD_TOKEN || null;
+}
+
 export async function loadWeights(path: string): Promise<Weights> {
  if (!(await fs.exists(path))) {
    throw new Error("Could not find the weights file");
--- a/src/cli/discord.js
+++ b/src/cli/discord.js
@ -0,0 +1,42 @@
+// @flow
+
+import * as Common from "./common";
+import {type Command} from "./command";
+import {LoggingTaskReporter} from "../util/taskReporter";
+import {DataDirectory} from "../backend/dataDirectory";
+import Loader from "../plugins/experimental-discord/loader";
+
+function die(std, message) {
+  std.err("fatal: " + message);
+  std.err("fatal: run 'sourcecred help discord' for help");
+  return 1;
+}
+
+// TODO: hack
+const reactionWeights = {"sourcecred:678399364418502669": 4};
+
+const discord: Command = async (args, std) => {
+  if (args.length !== 1) {
+    return die(std, "Expected one positional argument (or --help).");
+  }
+  const [guildId] = args;
+
+  const taskReporter = new LoggingTaskReporter();
+  const dir = new DataDirectory(Common.sourcecredDirectory());
+  const token = process.env.SOURCECRED_DISCORD_TOKEN || null;
+  if (!token) {
+    throw new Error("Expecting a SOURCECRED_DISCORD_TOKEN");
+  }
+
+  const opts = {
+    guildId,
+    reactionWeights,
+  };
+
+  await Loader.updateMirror(opts, token, dir, taskReporter);
+  const wg = await Loader.createGraph(opts, dir);
+  console.log(wg.graph, wg.weights);
+  return 0;
+};
+
+export default discord;
--- a/src/cli/discourse.js
+++ b/src/cli/discourse.js
@ -102,6 +102,7 @@ const command: Command = async (args, std) => {
      plugins,
      sourcecredDirectory: Common.sourcecredDirectory(),
      githubToken: null,
+      discordToken: null,
      initiativesDirectory: null,
    },
    taskReporter
--- a/src/cli/load.js
+++ b/src/cli/load.js
@ -149,6 +149,7 @@ const loadCommand: Command = async (args, std) => {
      params,
      weightsOverrides: weights,
      plugins,
+      discordToken: Common.discordToken(),
      sourcecredDirectory: Common.sourcecredDirectory(),
      githubToken,
      initiativesDirectory,
--- a/src/cli/load.test.js
+++ b/src/cli/load.test.js
@ -22,6 +22,7 @@ const load: JestMockFn = (require("../api/load").load: any);

 describe("cli/load", () => {
  const exampleGithubToken = validateToken("0".repeat(40));
+  const exampleDiscordToken = "fakeBotToken";
  beforeEach(() => {
    jest.clearAllMocks();
    // Tests should call `newSourcecredDirectory` directly when they
@ -34,6 +35,7 @@ describe("cli/load", () => {
    const dirname = tmp.dirSync().name;
    process.env.SOURCECRED_DIRECTORY = dirname;
    process.env.SOURCECRED_GITHUB_TOKEN = exampleGithubToken;
+    process.env.SOURCECRED_DISCORD_TOKEN = exampleDiscordToken;
    process.env.SOURCECRED_INITIATIVES_DIRECTORY = tmp.dirSync().name;
    return dirname;
  }
@ -82,6 +84,7 @@ describe("cli/load", () => {
        plugins: [githubDeclaration],
        sourcecredDirectory: Common.sourcecredDirectory(),
        githubToken: exampleGithubToken,
+        discordToken: exampleDiscordToken,
        initiativesDirectory: Common.initiativesDirectory(),
      };
      expect(await invocation).toEqual({
@ -107,6 +110,7 @@ describe("cli/load", () => {
        plugins: [githubDeclaration],
        sourcecredDirectory: Common.sourcecredDirectory(),
        githubToken: exampleGithubToken,
+        discordToken: exampleDiscordToken,
        initiativesDirectory: Common.initiativesDirectory(),
      });
      expect(await invocation).toEqual({
@ -145,6 +149,7 @@ describe("cli/load", () => {
        plugins: [githubDeclaration],
        sourcecredDirectory: Common.sourcecredDirectory(),
        githubToken: exampleGithubToken,
+        discordToken: exampleDiscordToken,
        initiativesDirectory: Common.initiativesDirectory(),
      };
      expect(await invocation).toEqual({
--- a/src/cli/sourcecred.js
+++ b/src/cli/sourcecred.js
@ -12,6 +12,7 @@ import output from "./output";
 import clear from "./clear";
 import genProject from "./genProject";
 import discourse from "./discourse";
+import discord from "./discord";

 const sourcecred: Command = async (args, std) => {
  if (args.length === 0) {
@ -35,6 +36,8 @@ const sourcecred: Command = async (args, std) => {
      return output(args.slice(1), std);
    case "gen-project":
      return genProject(args.slice(1), std);
+    case "discord":
+      return discord(args.slice(1), std);
    case "discourse":
      return discourse(args.slice(1), std);
    default:
--- a/src/core/project.js
+++ b/src/core/project.js
@ -7,6 +7,7 @@ import {type ProjectParameters as Initiatives} from "../plugins/initiatives/para
 import {type Identity} from "../plugins/identity/identity";
 import {type DiscourseServer} from "../plugins/discourse/server";
 import type {TimelineCredParameters} from "../analysis/timeline/params";
+import {type ProjectOptions as Discord} from "../plugins/experimental-discord/params";

 export type ProjectId = string;

@ -26,24 +27,26 @@ export type ProjectId = string;
 * the future (e.g. showing the last update time for each of the project's data
 * dependencies).
 */
-export type Project = ProjectV051;
+export type Project = ProjectV052;
 export type SupportedProject =
  | ProjectV030
  | ProjectV031
  | ProjectV040
+  | ProjectV050
  | ProjectV051
-  | ProjectV050;
+  | ProjectV052;

-export type ProjectV051 = {|
+export type ProjectV052 = {|
  +id: ProjectId,
  +initiatives: Initiatives | null,
  +repoIds: $ReadOnlyArray<RepoId>,
  +discourseServer: DiscourseServer | null,
+  +discord: Discord | null,
  +identities: $ReadOnlyArray<Identity>,
  +timelineCredParams: $Shape<TimelineCredParameters> | null,
 |};

-const COMPAT_INFO = {type: "sourcecred/project", version: "0.5.1"};
+const COMPAT_INFO = {type: "sourcecred/project", version: "0.5.2"};

 /**
 * Creates a new Project instance with default values.
@ -61,6 +64,7 @@ export function createProject(p: $Shape<Project>): Project {
    discourseServer: null,
    initiatives: null,
    timelineCredParams: null,
+    discord: null,
    ...p,
  };
 }
@ -83,11 +87,26 @@ export function encodeProjectId(id: ProjectId): string {
  return base64url.encode(id);
 }

-const upgradeFrom050 = (p: ProjectV050): ProjectV051 => ({
+const upgradeFrom051 = (p: ProjectV051): ProjectV052 => ({
  ...p,
-  timelineCredParams: {},
+  discord: null,
 });

+export type ProjectV051 = {|
+  +id: ProjectId,
+  +initiatives: Initiatives | null,
+  +repoIds: $ReadOnlyArray<RepoId>,
+  +discourseServer: DiscourseServer | null,
+  +identities: $ReadOnlyArray<Identity>,
+  +timelineCredParams: $Shape<TimelineCredParameters> | null,
+|};
+
+const upgradeFrom050 = (p: ProjectV050) =>
+  upgradeFrom051({
+    ...p,
+    timelineCredParams: {},
+  });
+
 export type ProjectV050 = {|
  +id: ProjectId,
  +initiatives: Initiatives | null,
@ -143,4 +162,5 @@ const upgrades = {
  "0.3.1": upgradeFrom030,
  "0.4.0": upgradeFrom040,
  "0.5.0": upgradeFrom050,
+  "0.5.1": upgradeFrom051,
 };
--- a/src/core/project.test.js
+++ b/src/core/project.test.js
@ -15,7 +15,7 @@ import {

 import {makeRepoId} from "../plugins/github/repoId";
 import {toCompat} from "../util/compat";
-import type {ProjectV050} from "./project";
+import type {ProjectV050, ProjectV051} from "./project";

 describe("core/project", () => {
  const foobar = deepFreeze(makeRepoId("foo", "bar"));
@ -27,6 +27,7 @@ describe("core/project", () => {
    initiatives: null,
    identities: [],
    timelineCredParams: null,
+    discord: null,
  });
  const p2: Project = deepFreeze({
    id: "@foo",
@ -40,6 +41,7 @@ describe("core/project", () => {
      },
    ],
    timelineCredParams: null,
+    discord: {guildId: "1234", reactionWeights: {}},
  });
  describe("to/from JSON", () => {
    it("round trip is identity", () => {
@ -77,6 +79,7 @@ describe("core/project", () => {
          // It should strip the apiUsername field, keeping just serverUrl.
          discourseServer: {serverUrl: "https://example.com"},
          initiatives: null,
+          discord: null,
          timelineCredParams: {},
        }: Project)
      );
@ -107,6 +110,7 @@ describe("core/project", () => {
          // It should strip the apiUsername field, keeping just serverUrl.
          discourseServer: {serverUrl: "https://example.com"},
          initiatives: null,
+          discord: null,
          timelineCredParams: {},
        }: Project)
      );
@ -133,6 +137,7 @@ describe("core/project", () => {
          ...body,
          // It should add a default initiatives field.
          initiatives: null,
+          discord: null,
          timelineCredParams: {},
        }: Project)
      );
@ -160,10 +165,37 @@ describe("core/project", () => {
          ...body,
          // It should add default params field.
          timelineCredParams: {},
+          discord: null,
        }: Project)
      );
    });
  });
+  it("should upgrade from 0.5.1 formatting", () => {
+    // Given
+    const body: ProjectV051 = {
+      id: "example-050",
+      repoIds: [foobar, foozod],
+      discourseServer: {serverUrl: "https://example.com"},
+      identities: [],
+      initiatives: null,
+      timelineCredParams: {},
+    };
+    const compat = toCompat(
+      {type: "sourcecred/project", version: "0.5.1"},
+      body
+    );
+
+    // When
+    const project = projectFromJSON(compat);
+
+    // Then
+    expect(project).toEqual(
+      ({
+        ...body,
+        discord: null,
+      }: Project)
+    );
+  });
  describe("encodeProjectId", () => {
    it("is a base64-url encoded id", () => {
      const project = {id: "foo bar", repoIds: []};
@ -202,6 +234,7 @@ describe("core/project", () => {
        repoIds: [],
        identities: [],
        timelineCredParams: null,
+        discord: null,
      });
    });
    it("treats input shape as overrides", () => {
@ -219,6 +252,12 @@ describe("core/project", () => {
          },
        ],
        timelineCredParams: {alpha: 0.2, intervalDecay: 0.5},
+        discord: {
+          guildId: "123",
+          reactionWeights: {
+            emoji: 1,
+          },
+        },
      };

      // When
--- a/src/core/project_io.test.js
+++ b/src/core/project_io.test.js
@ -39,6 +39,12 @@ describe("core/project_io", () => {
    identities: [{username: "foo", aliases: ["github/foo", "discourse/foo"]}],
    initiatives: {remoteUrl: "https://example.com/initiatives"},
    timelineCredParams: {alpha: 0.2, intervalDecay: 0.5},
+    discord: {
+      guildId: "123",
+      reactionWeights: {
+        emoji: 1,
+      },
+    },
  });

  it("setupProjectDirectory results in a loadable project", async () => {
--- a/src/plugins/discord/update_discord_api_snapshots.sh
+++ b/src/plugins/discord/update_discord_api_snapshots.sh
@ -2,7 +2,7 @@

 set -eu

-snapshots_dir=src/plugins/discord/snapshots
+snapshots_dir=src/plugins/experimental-discord/snapshots
 test_instance_url="https://discordapp.com/api"

 if [ ! "$(jq --version)" ]; then
--- a/src/plugins/experimental-discord/README.md
+++ b/src/plugins/experimental-discord/README.md
@ -0,0 +1,68 @@
+# SourceCred Discord plugin
+
+This plugin loads data from a Discord server.
+
+## Developer notes
+
+Discord developer docs can be found at:
+https://discordapp.com/developers/docs
+
+### Setting up a bot
+
+To query the API with a reasonable rate-limit, you should set up a Discord app,
+and a Discord bot as part of that app.
+
+```
+Discord app
+ └── Discord bot
+```
+
+You can create both on the developer portal here:
+https://discordapp.com/developers/applications
+
+
+Permissions this bot will need:
+
+- `View Channels`
+- `Read Message History`
+
+Represented as `66560` integer.
+
+Then, someone with appropriate permissions needs to invite this bot to the server.
+There isn't a simple generator for this link on the dev portal, you'll need to format it yourself like this:
+
+`https://discordapp.com/api/oauth2/authorize?client_id={{clientID}}&scope=bot&permissions={{permissionsInt}}`
+
+And open it in the browser, as a logged-in server admin.
+
+Read more: https://discordapp.com/developers/docs/topics/oauth2#bot-authorization-flow
+
+### Authenticating API requests
+
+You'll want to set your bot's token in a bot style Authorization header.
+
+https://discordapp.com/developers/docs/reference#authentication
+
+`Authorization: Bot MTk4NjIyNDgzNDcxOTI1MjQ4.Cl2FMQ.ZnCjm1XVW7vRze4b7Cq4se7kKWs`
+
+### Finding configuration values / parameters
+
+Many of the ID's you will need for configuration are exposed using the Discord client.
+
+By enabling developer mode (under Appearance > Advanced > Developer Mode).
+A right-click menu option "Copy ID" will appear.
+
+Not every element will support this "Copy ID". For example custom emoji.
+You can find some of those out by using the browser version of Discord and inspecting the DOM.
+
+Otherwise you can also use the API and query for it yourself with tools like Postman or CURL.
+
+
+With the bot invited and auth set up. Find out the Guild ID using:
+
+`GET https://discordapp.com/api/users/@me/guilds`
+
+Find your custom emoji using:
+
+`GET https://discordapp.com/api/guilds/{{discordGuildId}}/emojis`
+
--- a/src/plugins/experimental-discord/snapshots/fetcher.test.js.snap
+++ b/src/plugins/experimental-discord/snapshots/fetcher.test.js.snap
@ -0,0 +1,394 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`plugins/experimental-discord/fetcher snapshot testing loads channels 1`] = `
+Array [
+  Object {
+    "id": "678348980756938813",
+    "name": "Text Channels",
+    "type": "GUILD_CATEGORY",
+  },
+  Object {
+    "id": "678348980798881844",
+    "name": "Voice Channels",
+    "type": "GUILD_CATEGORY",
+  },
+  Object {
+    "id": "678348980849213472",
+    "name": "general",
+    "type": "GUILD_TEXT",
+  },
+  Object {
+    "id": "678348980878573661",
+    "name": "General",
+    "type": "GUILD_VOICE",
+  },
+  Object {
+    "id": "678394406507905129",
+    "name": "pagination",
+    "type": "GUILD_TEXT",
+  },
+  Object {
+    "id": "678696874869522446",
+    "name": "notmymessage",
+    "type": "GUILD_TEXT",
+  },
+]
+`;
+
+exports[`plugins/experimental-discord/fetcher snapshot testing loads emojis 1`] = `
+Array [
+  Object {
+    "id": "678399364418502669",
+    "name": "sourcecred",
+  },
+]
+`;
+
+exports[`plugins/experimental-discord/fetcher snapshot testing loads guilds 1`] = `
+Array [
+  Object {
+    "id": "453243919774253079",
+    "name": "sourcecred",
+    "permissions": 104193601,
+  },
+  Object {
+    "id": "629411177947987986",
+    "name": "MetaGame",
+    "permissions": 104324673,
+  },
+  Object {
+    "id": "678348980639498428",
+    "name": "SourceCred Test Server",
+    "permissions": 33620992,
+  },
+]
+`;
+
+exports[`plugins/experimental-discord/fetcher snapshot testing loads members 1`] = `
+Array [
+  Object {
+    "nick": null,
+    "roles": Array [
+      "678349848684003359",
+      "678350026946117694",
+    ],
+    "user": Object {
+      "bot": false,
+      "discriminator": "5887",
+      "id": "143776454050709505",
+      "username": "Beanow",
+    },
+  },
+  Object {
+    "nick": null,
+    "roles": Array [
+      "678349848684003359",
+      "678350026946117694",
+    ],
+    "user": Object {
+      "bot": false,
+      "discriminator": "8636",
+      "id": "420341518948237331",
+      "username": "decentralion",
+    },
+  },
+  Object {
+    "nick": null,
+    "roles": Array [
+      "678349848684003359",
+      "678350026946117694",
+    ],
+    "user": Object {
+      "bot": false,
+      "discriminator": "8658",
+      "id": "432981598858903585",
+      "username": "wchargin",
+    },
+  },
+  Object {
+    "nick": null,
+    "roles": Array [
+      "678349848684003359",
+      "678350026946117694",
+    ],
+    "user": Object {
+      "bot": false,
+      "discriminator": "2386",
+      "id": "439050857921904640",
+      "username": "Brian Litwin",
+    },
+  },
+  Object {
+    "nick": null,
+    "roles": Array [
+      "678359229433905152",
+    ],
+    "user": Object {
+      "bot": true,
+      "discriminator": "1705",
+      "id": "678351352770068560",
+      "username": "CredBot-Beanow",
+    },
+  },
+]
+`;
+
+exports[`plugins/experimental-discord/fetcher snapshot testing loads messages 1`] = `
+Array [
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "10",
+    "id": "678394455849566208",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812242234,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "9",
+    "id": "678394451462193154",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812241188,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "8",
+    "id": "678394448497082388",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812240481,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "7",
+    "id": "678394445351092275",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812239731,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "6",
+    "id": "678394442301833247",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812239004,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "5",
+    "id": "678394436757094410",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [
+      Object {
+        "id": "678399364418502669",
+        "name": "sourcecred",
+      },
+    ],
+    "timestampMs": 1581812237682,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "4",
+    "id": "678394433233747978",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812236842,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "3",
+    "id": "678394431149178940",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812236345,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "2",
+    "id": "678394428569813013",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812235730,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "1",
+    "id": "678394426153893948",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [
+      Object {
+        "id": null,
+        "name": "👍",
+      },
+    ],
+    "timestampMs": 1581812235154,
+  },
+]
+`;
+
+exports[`plugins/experimental-discord/fetcher snapshot testing loads messages 2`] = `
+Array [
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "20",
+    "id": "678394498098659349",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812252307,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "19",
+    "id": "678394493124476939",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812251121,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "18",
+    "id": "678394489391415348",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812250231,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "17",
+    "id": "678394486644146187",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812249576,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "16",
+    "id": "678394484291141700",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812249015,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "15",
+    "id": "678394480184918016",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [
+      Object {
+        "id": null,
+        "name": "😆",
+      },
+    ],
+    "timestampMs": 1581812248036,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "14",
+    "id": "678394477106167818",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812247302,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "13",
+    "id": "678394473428025354",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812246425,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "12",
+    "id": "678394469048909841",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812245381,
+  },
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "content": "11",
+    "id": "678394468373626890",
+    "mentions": Array [],
+    "nonUserAuthor": false,
+    "reactionEmoji": Array [],
+    "timestampMs": 1581812245220,
+  },
+]
+`;
+
+exports[`plugins/experimental-discord/fetcher snapshot testing loads reactions 1`] = `
+Array [
+  Object {
+    "authorId": "143776454050709505",
+    "channelId": "678394406507905129",
+    "emoji": Object {
+      "id": "678399364418502669",
+      "name": "sourcecred",
+    },
+    "messageId": "678394436757094410",
+  },
+]
+`;
+
+exports[`plugins/experimental-discord/fetcher snapshot testing loads roles 1`] = `
+Array [
+  Object {
+    "id": "678348980639498428",
+    "name": "@everyone",
+  },
+  Object {
+    "id": "678349848684003359",
+    "name": "allow-adding-data",
+  },
+  Object {
+    "id": "678350026946117694",
+    "name": "admins",
+  },
+  Object {
+    "id": "678359229433905152",
+    "name": "CredBot-Beanow",
+  },
+]
+`;
--- a/src/plugins/experimental-discord/createGraph.js
+++ b/src/plugins/experimental-discord/createGraph.js
@ -0,0 +1,271 @@
+// @flow
+
+import {escape} from "entities";
+import {type WeightedGraph as WeightedGraphT} from "../../core/weightedGraph";
+import {type Weights, type NodeWeight} from "../../core/weights";
+import {
+  Graph,
+  NodeAddress,
+  EdgeAddress,
+  type Node,
+  type Edge,
+  type NodeAddressT,
+  type EdgeAddressT,
+} from "../../core/graph";
+import {SqliteMirrorRepository} from "./mirrorRepository";
+import {
+  memberNodeType,
+  messageNodeType,
+  reactionNodeType,
+  authorsMessageEdgeType,
+  addsReactionEdgeType,
+  reactsToEdgeType,
+  mentionsEdgeType,
+} from "./declaration";
+import * as Model from "./models";
+
+// Display this many characters in description.
+const MESSAGE_LENGTH = 30;
+
+function messageUrl(
+  guild: Model.Snowflake,
+  channel: Model.Snowflake,
+  message: Model.Snowflake
+) {
+  return `https://discordapp.com/channels/${guild}/${channel}/${message}`;
+}
+
+export function userAddress(userId: Model.Snowflake): NodeAddressT {
+  return NodeAddress.append(memberNodeType.prefix, "user", userId);
+}
+
+function memberAddress(member: Model.GuildMember): NodeAddressT {
+  return NodeAddress.append(
+    memberNodeType.prefix,
+    member.user.bot ? "bot" : "user",
+    member.user.id
+  );
+}
+
+function messageAddress(message: Model.Message): NodeAddressT {
+  return NodeAddress.append(
+    messageNodeType.prefix,
+    message.channelId,
+    message.id
+  );
+}
+
+function reactionAddress(reaction: Model.Reaction): NodeAddressT {
+  // Hacky order, so we can boost categories.
+  return NodeAddress.append(
+    reactionNodeType.prefix,
+    reaction.channelId,
+    Model.emojiToRef(reaction.emoji),
+    reaction.authorId,
+    reaction.messageId
+  );
+}
+
+function memberNode(member: Model.GuildMember): Node {
+  const description = `${escape(member.user.username)}#${
+    member.user.discriminator
+  }`;
+  return {
+    address: memberAddress(member),
+    description,
+    timestampMs: null,
+  };
+}
+
+function messageNode(
+  message: Model.Message,
+  guild: Model.Snowflake,
+  channelName: string
+): Node {
+  const url = messageUrl(guild, message.channelId, message.id);
+  const partialMessage = escape(message.content.substring(0, MESSAGE_LENGTH));
+  const description = `#${channelName} message ["${partialMessage}..."](${url})`;
+  return {
+    address: messageAddress(message),
+    description,
+    timestampMs: message.timestampMs,
+  };
+}
+
+function authorsMessageEdge(
+  message: Model.Message,
+  author: Model.GuildMember
+): Edge {
+  const address: EdgeAddressT = EdgeAddress.append(
+    authorsMessageEdgeType.prefix,
+    author.user.bot ? "bot" : "user",
+    author.user.id,
+    message.channelId,
+    message.id
+  );
+  return {
+    address,
+    timestampMs: message.timestampMs,
+    src: memberAddress(author),
+    dst: messageAddress(message),
+  };
+}
+
+function reactionNode(
+  reaction: Model.Reaction,
+  timestampMs: number,
+  guild: Model.Snowflake
+): Node {
+  const msgUrl = messageUrl(guild, reaction.channelId, reaction.messageId);
+  const reactionStr = reaction.emoji.id
+    ? `:${reaction.emoji.name}:`
+    : reaction.emoji.name;
+  const description = `Reacted \`${reactionStr}\` to message [${reaction.messageId}](${msgUrl})`;
+  return {
+    address: reactionAddress(reaction),
+    description,
+    timestampMs,
+  };
+}
+
+function addsReactionEdge(
+  reaction: Model.Reaction,
+  member: Model.GuildMember,
+  timestampMs: number
+): Edge {
+  const address: EdgeAddressT = EdgeAddress.append(
+    addsReactionEdgeType.prefix,
+    member.user.bot ? "bot" : "user",
+    member.user.id,
+    Model.emojiToRef(reaction.emoji),
+    reaction.channelId,
+    reaction.messageId
+  );
+  return {
+    address,
+    // TODO: for now using timestamp of the message,
+    // as reactions don't have timestamps.
+    timestampMs,
+    src: memberAddress(member),
+    dst: reactionAddress(reaction),
+  };
+}
+
+function reactsToEdge(reaction: Model.Reaction, message: Model.Message): Edge {
+  const address: EdgeAddressT = EdgeAddress.append(
+    reactsToEdgeType.prefix,
+    Model.emojiToRef(reaction.emoji),
+    reaction.authorId,
+    reaction.channelId,
+    reaction.messageId
+  );
+  return {
+    address,
+    // TODO: for now using timestamp of the message,
+    // as reactions don't have timestamps.
+    timestampMs: message.timestampMs,
+    src: reactionAddress(reaction),
+    dst: messageAddress(message),
+  };
+}
+
+function mentionsEdge(message: Model.Message, member: Model.GuildMember): Edge {
+  const address: EdgeAddressT = EdgeAddress.append(
+    mentionsEdgeType.prefix,
+    message.channelId,
+    message.authorId,
+    message.id,
+    member.user.bot ? "bot" : "user",
+    member.user.id
+  );
+  return {
+    address,
+    timestampMs: message.timestampMs,
+    src: messageAddress(message),
+    dst: memberAddress(member),
+  };
+}
+
+export type EmojiWeightMap = {[ref: Model.EmojiRef]: NodeWeight};
+
+export function createGraph(
+  guild: Model.Snowflake,
+  repo: SqliteMirrorRepository,
+  declarationWeights: Weights,
+  emojiWeights: EmojiWeightMap
+): WeightedGraphT {
+  const wg = {
+    graph: new Graph(),
+    weights: declarationWeights,
+  };
+
+  const memberMap = new Map(repo.members().map((m) => [m.user.id, m]));
+  const channels = repo.channels();
+  for (const channel of channels) {
+    const messages = repo.messages(channel.id);
+    for (const message of messages) {
+      const hasMentions = message.mentions.length > 0;
+      if (!hasMentions && message.reactionEmoji.length === 0) continue;
+      if (message.nonUserAuthor) continue;
+
+      let hasWeightedEmoji = false;
+      const reactions = repo.reactions(channel.id, message.id);
+      for (const reaction of reactions) {
+        const emojiRef = Model.emojiToRef(reaction.emoji);
+        const reactionWeight = emojiWeights[emojiRef];
+
+        // TODO: Skip all unweighted emoji in prototype.
+        if (!reactionWeight) continue;
+
+        const reactingMember = memberMap.get(reaction.authorId);
+        if (!reactingMember) {
+          console.warn(
+            `Reacting member not loaded ${reaction.authorId} (reacted ${emojiRef}), maybe a Deleted User?\n` +
+              `${messageUrl(guild, channel.id, message.id)}`
+          );
+          continue;
+        }
+
+        hasWeightedEmoji = true;
+        const node = reactionNode(reaction, message.timestampMs, guild);
+        wg.weights.nodeWeights.set(node.address, reactionWeight);
+        wg.graph.addNode(node);
+        wg.graph.addNode(memberNode(reactingMember));
+        wg.graph.addEdge(reactsToEdge(reaction, message));
+        wg.graph.addEdge(
+          addsReactionEdge(reaction, reactingMember, message.timestampMs)
+        );
+      }
+
+      for (const userId of message.mentions) {
+        const mentionedMember = memberMap.get(userId);
+        if (!mentionedMember) {
+          console.warn(
+            `Mentioned member not loaded ${userId}, maybe a Deleted User?\n` +
+              `${messageUrl(guild, channel.id, message.id)}`
+          );
+          continue;
+        }
+        wg.graph.addNode(memberNode(mentionedMember));
+        wg.graph.addEdge(mentionsEdge(message, mentionedMember));
+      }
+
+      // Don't bloat the graph with no-weighted-reaction messages.
+      if (hasWeightedEmoji || hasMentions) {
+        const author = memberMap.get(message.authorId);
+        if (!author) {
+          console.warn(
+            `Message author not loaded ${message.authorId}, maybe a Deleted User?\n` +
+              `${messageUrl(guild, channel.id, message.id)}`
+          );
+          continue;
+        }
+        wg.graph.addNode(memberNode(author));
+        wg.graph.addNode(messageNode(message, guild, channel.name));
+        wg.graph.addEdge(authorsMessageEdge(message, author));
+      }
+    }
+  }
+
+  return wg;
+}
--- a/src/plugins/experimental-discord/declaration.js
+++ b/src/plugins/experimental-discord/declaration.js
@ -0,0 +1,79 @@
+// @flow
+
+import deepFreeze from "deep-freeze";
+import type {PluginDeclaration} from "../../analysis/pluginDeclaration";
+import type {NodeType, EdgeType} from "../../analysis/types";
+import {NodeAddress, EdgeAddress} from "../../core/graph";
+
+export const nodePrefix = NodeAddress.fromParts(["sourcecred", "discord"]);
+export const edgePrefix = EdgeAddress.fromParts(["sourcecred", "discord"]);
+
+export const memberNodeType: NodeType = deepFreeze({
+  name: "Member",
+  pluralName: "Members",
+  prefix: NodeAddress.append(nodePrefix, "MEMBER"),
+  defaultWeight: 0,
+  description: "A member of the Discord server",
+});
+
+export const messageNodeType: NodeType = deepFreeze({
+  name: "Message",
+  pluralName: "Messages",
+  prefix: NodeAddress.append(nodePrefix, "MESSAGE"),
+  defaultWeight: 0,
+  description: "A Discord message, posted in a particular channel",
+});
+
+export const reactionNodeType: NodeType = deepFreeze({
+  name: "Reaction",
+  pluralName: "Reactions",
+  prefix: NodeAddress.append(nodePrefix, "REACTION"),
+  defaultWeight: 1,
+  description: "A reaction by some user, directed at some message",
+});
+
+export const authorsMessageEdgeType: EdgeType = deepFreeze({
+  forwardName: "authors message",
+  backwardName: "message is authored by",
+  prefix: EdgeAddress.append(edgePrefix, "AUTHORS", "MESSAGE"),
+  defaultWeight: {forwards: 1 / 4, backwards: 1},
+  description: "Connects an author to a message they've created.",
+});
+
+export const addsReactionEdgeType: EdgeType = deepFreeze({
+  forwardName: "adds reaction",
+  backwardName: "reaction added by",
+  prefix: EdgeAddress.append(edgePrefix, "ADDS_REACTION"),
+  defaultWeight: {forwards: 1, backwards: 1 / 16},
+  description: "Connects a member to a reaction that they added.",
+});
+
+export const reactsToEdgeType: EdgeType = deepFreeze({
+  forwardName: "reacts to",
+  backwardName: "is reacted to by",
+  prefix: EdgeAddress.append(edgePrefix, "REACTS_TO"),
+  defaultWeight: {forwards: 1, backwards: 1 / 16},
+  description: "Connects a reaction to a message that it reacts to.",
+});
+
+export const mentionsEdgeType: EdgeType = deepFreeze({
+  forwardName: "mentions",
+  backwardName: "is mentioned by",
+  prefix: EdgeAddress.append(edgePrefix, "MENTIONS"),
+  defaultWeight: {forwards: 1, backwards: 1 / 16},
+  description: "Connects a message to the member being mentioned.",
+});
+
+export const declaration: PluginDeclaration = deepFreeze({
+  name: "Discord",
+  nodePrefix,
+  edgePrefix,
+  nodeTypes: [memberNodeType, messageNodeType, reactionNodeType],
+  edgeTypes: [
+    authorsMessageEdgeType,
+    addsReactionEdgeType,
+    reactsToEdgeType,
+    mentionsEdgeType,
+  ],
+  userTypes: [memberNodeType],
+});
--- a/src/plugins/experimental-discord/fetcher.js
+++ b/src/plugins/experimental-discord/fetcher.js
@ -0,0 +1,189 @@
+// @flow
+
+import fetch from "isomorphic-fetch";
+import * as Model from "./models";
+
+export interface DiscordApi {
+  guilds(): Promise<$ReadOnlyArray<Model.Guild>>;
+  emojis(guild: Model.Snowflake): Promise<$ReadOnlyArray<Model.Emoji>>;
+  channels(guild: Model.Snowflake): Promise<$ReadOnlyArray<Model.Channel>>;
+  roles(guild: Model.Snowflake): Promise<$ReadOnlyArray<Model.Role>>;
+  members(guild: Model.Snowflake): Promise<$ReadOnlyArray<Model.GuildMember>>;
+  messages(
+    channel: Model.Snowflake,
+    after: Model.Snowflake,
+    limit: number
+  ): Promise<$ReadOnlyArray<Model.Message>>;
+  reactions(
+    channel: Model.Snowflake,
+    message: Model.Snowflake,
+    emoji: Model.Emoji
+  ): Promise<$ReadOnlyArray<Model.Reaction>>;
+}
+
+const fetcherDefaults: FetcherOptions = {
+  apiUrl: "https://discordapp.com/api",
+  token: null,
+  fetch,
+};
+
+type FetcherOptions = {|
+  +apiUrl: string,
+  +fetch: typeof fetch,
+  +token: ?Model.BotToken,
+|};
+
+export class Fetcher implements DiscordApi {
+  +_options: FetcherOptions;
+
+  constructor(opts?: $Shape<FetcherOptions>) {
+    this._options = {...fetcherDefaults, ...opts};
+    if (!this._options.token) {
+      throw new Error("A BotToken is required");
+    }
+  }
+
+  _fetch(endpoint: string): Promise<Response> {
+    const {apiUrl, token} = this._options;
+    if (!token) {
+      throw new Error("A BotToken is required");
+    }
+    const requestOptions = {
+      method: "GET",
+      headers: {
+        Accept: "application/json",
+        Authorization: `Bot ${token}`,
+      },
+    };
+    const url = new URL(`${apiUrl}${endpoint}`).href;
+    return this._options.fetch(url, requestOptions);
+  }
+
+  async _fetchJson(endpoint: string): Promise<any> {
+    const res = await this._fetch(endpoint);
+    failIfMissing(res);
+    failForNotOk(res);
+    return await res.json();
+  }
+
+  async guilds(): Promise<$ReadOnlyArray<Model.Guild>> {
+    const guilds = await this._fetchJson("/users/@me/guilds");
+    return guilds.map((x) => ({
+      id: x.id,
+      name: x.name,
+      permissions: x.permissions,
+    }));
+  }
+
+  async emojis(guild: Model.Snowflake): Promise<$ReadOnlyArray<Model.Emoji>> {
+    const emojis = await this._fetchJson(`/guilds/${guild}/emojis`);
+    return emojis.map((x) => ({
+      id: x.id,
+      name: x.name,
+    }));
+  }
+
+  async channels(
+    guild: Model.Snowflake
+  ): Promise<$ReadOnlyArray<Model.Channel>> {
+    const channels = await this._fetchJson(`/guilds/${guild}/channels`);
+    return channels.map((x) => ({
+      id: x.id,
+      name: x.name,
+      type: Model.channelTypeFromId(x.type),
+    }));
+  }
+
+  async roles(guild: Model.Snowflake): Promise<$ReadOnlyArray<Model.Role>> {
+    const roles = await this._fetchJson(`/guilds/${guild}/roles`);
+    return roles.map((x) => ({
+      id: x.id,
+      name: x.name,
+    }));
+  }
+
+  async members(
+    guild: Model.Snowflake
+  ): Promise<$ReadOnlyArray<Model.GuildMember>> {
+    // TODO: hack, should have pagination.
+    const members = await this._fetchJson(
+      `/guilds/${guild}/members?limit=1000`
+    );
+    if (members.length === 1000) {
+      throw new Error(
+        "TODO: getting 1000 members, needs to implement pagination"
+      );
+    }
+    return members.map((x) => ({
+      user: {
+        id: x.user.id,
+        username: x.user.username,
+        discriminator: x.user.discriminator,
+        bot: x.user.bot || x.user.system || false,
+      },
+      nick: x.nick || null,
+      roles: x.roles,
+    }));
+  }
+
+  async messages(
+    channel: Model.Snowflake,
+    after: Model.Snowflake,
+    limit: number
+  ): Promise<$ReadOnlyArray<Model.Message>> {
+    const messages = await this._fetchJson(
+      `/channels/${channel}/messages?after=${after}&limit=${limit}`
+    );
+    return messages.map((x) => ({
+      id: x.id,
+      channelId: channel,
+      authorId: x.author.id,
+      timestampMs: Date.parse(x.timestamp),
+      content: x.content,
+      reactionEmoji: (x.reactions || []).map((r) => r.emoji),
+      nonUserAuthor: x.webhook_id != null || false,
+      mentions: (x.mentions || []).map((user) => user.id),
+    }));
+  }
+
+  async reactions(
+    channel: Model.Snowflake,
+    message: Model.Snowflake,
+    emoji: Model.Emoji
+  ): Promise<$ReadOnlyArray<Model.Reaction>> {
+    // TODO: implement pagination.
+    const after = "0";
+    const limit = 100;
+    const emojiRef = Model.emojiToRef(emoji);
+    const reactingUsers = await this._fetchJson(
+      `/channels/${channel}/messages/${message}/reactions/${emojiRef}?after=${after}&limit=${limit}`
+    );
+    if (reactingUsers.length === 100) {
+      throw new Error("TODO: implement reactions pagination");
+    }
+    return reactingUsers.map((x) => ({
+      channelId: channel,
+      messageId: message,
+      emoji,
+      authorId: x.id,
+    }));
+  }
+}
+
+function failIfMissing(response: Response) {
+  if (response.status === 404) {
+    throw new Error(`404 Not Found on: ${response.url}; maybe bad serverUrl?`);
+  }
+  if (response.status === 403) {
+    throw new Error(`403 Forbidden: bad API username or key?\n${response.url}`);
+  }
+  if (response.status === 410) {
+    throw new Error(`410 Gone`);
+  }
+}
+
+function failForNotOk(response: Response) {
+  if (!response.ok) {
+    throw new Error(`not OK status ${response.status} on ${response.url}`);
+  }
+}
--- a/src/plugins/experimental-discord/fetcher.test.js
+++ b/src/plugins/experimental-discord/fetcher.test.js
@ -0,0 +1,41 @@
+// @flow
+
+import {snapshotFetcher} from "./mockSnapshotFetcher";
+
+describe("plugins/experimental-discord/fetcher", () => {
+  describe("snapshot testing", () => {
+    const guildId = "678348980639498428";
+    const channelId = "678394406507905129";
+    const messageId = "678394436757094410";
+    const emoji = {id: "678399364418502669", name: "sourcecred"};
+
+    it("loads guilds", async () => {
+      expect(await snapshotFetcher().guilds()).toMatchSnapshot();
+    });
+    it("loads channels", async () => {
+      expect(await snapshotFetcher().channels(guildId)).toMatchSnapshot();
+    });
+    it("loads emojis", async () => {
+      expect(await snapshotFetcher().emojis(guildId)).toMatchSnapshot();
+    });
+    it("loads roles", async () => {
+      expect(await snapshotFetcher().roles(guildId)).toMatchSnapshot();
+    });
+    it("loads members", async () => {
+      expect(await snapshotFetcher().members(guildId)).toMatchSnapshot();
+    });
+    it("loads messages", async () => {
+      expect(
+        await snapshotFetcher().messages(channelId, "0", 10)
+      ).toMatchSnapshot();
+      expect(
+        await snapshotFetcher().messages(channelId, "678394455849566208", 10)
+      ).toMatchSnapshot();
+    });
+    it("loads reactions", async () => {
+      expect(
+        await snapshotFetcher().reactions(channelId, messageId, emoji)
+      ).toMatchSnapshot();
+    });
+  });
+});
--- a/src/plugins/experimental-discord/loader.js
+++ b/src/plugins/experimental-discord/loader.js
@ -0,0 +1,56 @@
+// @flow
+
+import {type PluginDeclaration} from "../../analysis/pluginDeclaration";
+import {type WeightedGraph} from "../../core/weightedGraph";
+import {TaskReporter} from "../../util/taskReporter";
+import {type CacheProvider} from "../../backend/cache";
+import {SqliteMirrorRepository} from "./mirrorRepository";
+import {weightsForDeclaration} from "../../analysis/pluginDeclaration";
+import {createGraph as _createGraph} from "./createGraph";
+import {type ProjectOptions} from "./params";
+import {declaration} from "./declaration";
+import * as Model from "./models";
+import {Fetcher} from "./fetcher";
+import {Mirror} from "./mirror";
+
+export interface Loader {
+  declaration(): PluginDeclaration;
+  updateMirror: typeof updateMirror;
+  createGraph: typeof createGraph;
+}
+
+export default ({
+  declaration: () => declaration,
+  updateMirror,
+  createGraph,
+}: Loader);
+
+export async function updateMirror(
+  {guildId}: ProjectOptions,
+  token: Model.BotToken,
+  cache: CacheProvider,
+  reporter: TaskReporter
+): Promise<void> {
+  const repo = await repository(cache, guildId);
+  const fetcher = new Fetcher({token});
+  const mirror = new Mirror(repo, fetcher, guildId);
+  await mirror.update(reporter);
+}
+
+export async function createGraph(
+  {guildId, reactionWeights}: ProjectOptions,
+  cache: CacheProvider
+): Promise<WeightedGraph> {
+  const repo = await repository(cache, guildId);
+  const declarationWeights = weightsForDeclaration(declaration);
+  return await _createGraph(guildId, repo, declarationWeights, reactionWeights);
+}
+
+async function repository(
+  cache: CacheProvider,
+  guild: Model.Snowflake
+): Promise<SqliteMirrorRepository> {
+  // TODO: should replace base64url with hex, to be case insensitive.
+  const db = await cache.database(`discord_${guild}`);
+  return new SqliteMirrorRepository(db, guild);
+}
--- a/src/plugins/experimental-discord/mirror.js
+++ b/src/plugins/experimental-discord/mirror.js
@ -0,0 +1,98 @@
+// @flow
+
+import {TaskReporter} from "../../util/taskReporter";
+import {type DiscordApi} from "./fetcher";
+import {SqliteMirrorRepository} from "./mirrorRepository";
+import * as Model from "./models";
+
+// How many messages for each channel to reload.
+const RELOAD_DEPTH = 50;
+
+export class Mirror {
+  +_repo: SqliteMirrorRepository;
+  +_api: DiscordApi;
+  +guild: Model.Snowflake;
+
+  constructor(
+    repo: SqliteMirrorRepository,
+    api: DiscordApi,
+    guild: Model.Snowflake
+  ) {
+    this._repo = repo;
+    this._api = api;
+    this.guild = guild;
+  }
+
+  async update(reporter: TaskReporter) {
+    const guild = await this.validateGuildId();
+    reporter.start(`discord/${guild.name}`);
+    await this.addMembers();
+    const channels = await this.addTextChannels();
+    for (const channel of channels) {
+      reporter.start(`discord/${guild.name}/#${channel.name}`);
+      try {
+        await this.addMessages(channel.id);
+      } catch (e) {
+        console.warn(e);
+      }
+      reporter.finish(`discord/${guild.name}/#${channel.name}`);
+    }
+    reporter.finish(`discord/${guild.name}`);
+  }
+
+  async validateGuildId() {
+    const guilds = await this._api.guilds();
+    const guild = guilds.find((g) => g.id === this.guild);
+    if (!guild) {
+      throw new Error(
+        `Couldn't find guild with ID ${this.guild}\nMaybe the bot has no access to it?`
+      );
+    }
+    // TODO: validate bot permissions
+    return guild;
+  }
+
+  async addMembers() {
+    const members = await this._api.members(this.guild);
+    for (const member of members) {
+      this._repo.addMember(member);
+    }
+    return this._repo.members();
+  }
+
+  async addTextChannels() {
+    const channels = await this._api.channels(this.guild);
+    for (const channel of channels) {
+      if (channel.type !== "GUILD_TEXT") continue;
+      this._repo.addChannel(channel);
+    }
+    return this._repo.channels();
+  }
+
+  async addMessages(channel: Model.Snowflake, messageLimit?: number) {
+    const loadStart = this._repo.nthMessageFromTail(channel, RELOAD_DEPTH);
+    // console.log(channel, (loadStart || {}).id);
+
+    const limit = messageLimit || 100;
+    let page: $ReadOnlyArray<Model.Message> = [];
+    let after: Model.Snowflake = loadStart ? loadStart.id : "0";
+    do {
+      page = await this._api.messages(channel, after, limit);
+      for (const message of page) {
+        after = after < message.id ? message.id : after;
+        this._repo.addMessage(message);
+        for (const emoji of message.reactionEmoji) {
+          const reactions = await this._api.reactions(
+            channel,
+            message.id,
+            emoji
+          );
+          for (const reaction of reactions) {
+            this._repo.addReaction(reaction);
+          }
+        }
+      }
+    } while (page.length >= limit);
+    return this._repo.messages(channel);
+  }
+}
--- a/src/plugins/experimental-discord/mirror.test.js
+++ b/src/plugins/experimental-discord/mirror.test.js
@ -0,0 +1,28 @@
+// @flow
+
+import Database from "better-sqlite3";
+import {snapshotFetcher} from "./mockSnapshotFetcher";
+import {SqliteMirrorRepository} from "./mirrorRepository";
+import {Mirror} from "./mirror";
+
+describe("plugins/experimental-discord/mirror", () => {
+  describe("smoke test", () => {
+    const guildId = "678348980639498428";
+    // const channelId = "678394406507905129";
+
+    it("should print", async () => {
+      // Given
+      const repo = new SqliteMirrorRepository(
+        new Database(":memory:"),
+        guildId
+      );
+      const api = snapshotFetcher();
+
+      // When
+      const mirror = new Mirror(repo, api, guildId);
+      await mirror.addMembers();
+      await mirror.addTextChannels();
+      // await mirror.addMessages(channelId, 10);
+    });
+  });
+});
--- a/src/plugins/experimental-discord/mirrorRepository.js
+++ b/src/plugins/experimental-discord/mirrorRepository.js
@ -0,0 +1,463 @@
+// @flow
+
+import type Database from "better-sqlite3";
+import stringify from "json-stable-stringify";
+import * as Model from "./models";
+import dedent from "../../util/dedent";
+
+const VERSION = "discord_mirror_v1";
+
+export class SqliteMirrorRepository {
+  +_db: Database;
+
+  constructor(db: Database, guild: Model.Snowflake) {
+    if (db == null) throw new Error("db: " + String(db));
+    this._db = db;
+    this._transaction(() => {
+      this._initialize(guild);
+    });
+  }
+
+  _transaction(queries: () => void) {
+    const db = this._db;
+    if (db.inTransaction) {
+      throw new Error("already in transaction");
+    }
+    try {
+      db.prepare("BEGIN").run();
+      queries();
+      if (db.inTransaction) {
+        db.prepare("COMMIT").run();
+      }
+    } finally {
+      if (db.inTransaction) {
+        db.prepare("ROLLBACK").run();
+      }
+    }
+  }
+
+  _initialize(guild: Model.Snowflake) {
+    const db = this._db;
+    // We store the config in a singleton table `meta`, whose unique row
+    // has primary key `0`. Only the first ever insert will succeed; we
+    // are locked into the first config.
+    db.prepare(
+      dedent`\
+        CREATE TABLE IF NOT EXISTS meta (
+            zero INTEGER PRIMARY KEY,
+            config TEXT NOT NULL
+        )
+      `
+    ).run();
+
+    const config = stringify({
+      version: VERSION,
+      guild,
+    });
+
+    const existingConfig: string | void = db
+      .prepare("SELECT config FROM meta")
+      .pluck()
+      .get();
+    if (existingConfig === config) {
+      // Already set up; nothing to do.
+      return;
+    } else if (existingConfig !== undefined) {
+      throw new Error(
+        "Database already populated with incompatible server or version"
+      );
+    }
+    db.prepare("INSERT INTO meta (zero, config) VALUES (0, ?)").run(config);
+
+    const tables = [
+      dedent`\
+        CREATE TABLE channels (
+            id TEXT PRIMARY KEY,
+            type TEXT NOT NULL,
+            name TEXT NOT NULL
+        )
+      `,
+      dedent`\
+        CREATE TABLE members (
+            user_id TEXT PRIMARY KEY,
+            username TEXT NOT NULL,
+            discriminator TEXT NOT NULL,
+            bot INTEGER NOT NULL,
+            nick TEXT
+        )
+      `,
+      dedent`\
+        CREATE TABLE member_roles (
+            user_id TEXT,
+            role TEXT NOT NULL,
+            CONSTRAINT user_role PRIMARY KEY (user_id, role)
+        )
+      `,
+      dedent`\
+        CREATE TABLE messages (
+            id TEXT PRIMARY KEY,
+            channel_id TEXT NOT NULL,
+            author_id TEXT NOT NULL,
+            non_user_author INTEGER NOT NULL,
+            timestamp_ms INTEGER NOT NULL,
+            content TEXT NOT NULL
+        )
+      `,
+      dedent`\
+        CREATE TABLE message_reactions (
+            channel_id TEXT NOT NULL,
+            message_id TEXT NOT NULL,
+            author_id TEXT NOT NULL,
+            emoji TEXT NOT NULL,
+            CONSTRAINT value_object PRIMARY KEY (channel_id, message_id, author_id, emoji)
+        )
+      `,
+      dedent`\
+        CREATE TABLE message_mentions (
+            channel_id TEXT NOT NULL,
+            message_id TEXT NOT NULL,
+            user_id TEXT NOT NULL,
+            CONSTRAINT value_object PRIMARY KEY (channel_id, message_id, user_id)
+        )
+      `,
+    ];
+    for (const sql of tables) {
+      db.prepare(sql).run();
+    }
+  }
+
+  members(): $ReadOnlyArray<Model.GuildMember> {
+    return this._db
+      .prepare(
+        dedent`\
+        SELECT
+          user_id,
+          username,
+          discriminator,
+          bot,
+          nick
+        FROM members`
+      )
+      .all()
+      .map((x) => ({
+        user: {
+          id: x.user_id,
+          username: x.username,
+          discriminator: x.discriminator,
+          bot: x.bot === 1,
+        },
+        nick: x.nick,
+        roles: this.memberRoles(x.user_id),
+      }));
+  }
+
+  memberRoles(user: Model.Snowflake): $ReadOnlyArray<Model.Snowflake> {
+    return this._db
+      .prepare(
+        dedent`\
+        SELECT
+          user_id,
+          role
+        FROM member_roles
+        WHERE user_id = :user_id`
+      )
+      .all({user_id: user})
+      .map((x) => x.role);
+  }
+
+  channels(): $ReadOnlyArray<Model.Channel> {
+    return this._db
+      .prepare(
+        dedent`\
+        SELECT
+          id,
+          type,
+          name
+        FROM channels`
+      )
+      .all();
+  }
+
+  messages(channel: Model.Snowflake): $ReadOnlyArray<Model.Message> {
+    return this._db
+      .prepare(
+        dedent`\
+        SELECT
+          id,
+          channel_id,
+          author_id,
+          non_user_author,
+          timestamp_ms,
+          content
+        FROM messages
+        WHERE channel_id = :channel_id`
+      )
+      .all({channel_id: channel})
+      .map((m) => ({
+        id: m.id,
+        channelId: m.channel_id,
+        authorId: m.author_id,
+        nonUserAuthor: m.non_user_author === 1,
+        timestampMs: m.timestamp_ms,
+        content: m.content,
+        reactionEmoji: this.reactionEmoji(m.channel_id, m.id),
+        mentions: this.mentions(m.channel_id, m.id),
+      }));
+  }
+
+  nthMessageFromTail(channel: Model.Snowflake, n: number): ?Model.Message {
+    const count = this._db
+      .prepare(
+        dedent`\
+        SELECT count(*) as count
+        FROM messages
+        WHERE channel_id = :channel_id`
+      )
+      .get({channel_id: channel}).count;
+
+    if (count < n) return null;
+    const offset = count - n;
+    const m = this._db
+      .prepare(
+        dedent`\
+        SELECT
+          id,
+          channel_id,
+          author_id,
+          non_user_author,
+          timestamp_ms,
+          content
+        FROM messages
+        WHERE channel_id = :channel_id
+        ORDER BY timestamp_ms
+        LIMIT 1
+        OFFSET :offset
+        `
+      )
+      .get({channel_id: channel, offset});
+
+    return {
+      id: m.id,
+      channelId: m.channel_id,
+      authorId: m.author_id,
+      nonUserAuthor: m.non_user_author === 1,
+      timestampMs: m.timestamp_ms,
+      content: m.content,
+      reactionEmoji: this.reactionEmoji(m.channel_id, m.id),
+      mentions: this.mentions(m.channel_id, m.id),
+    };
+  }
+
+  mentions(
+    channel: Model.Snowflake,
+    message: Model.Snowflake
+  ): $ReadOnlyArray<Model.Snowflake> {
+    return this._db
+      .prepare(
+        dedent`\
+        SELECT user_id
+        FROM message_mentions
+        WHERE channel_id = :channel_id
+          AND message_id = :message_id`
+      )
+      .all({channel_id: channel, message_id: message})
+      .map((res) => res.user_id);
+  }
+
+  reactionEmoji(
+    channel: Model.Snowflake,
+    message: Model.Snowflake
+  ): $ReadOnlyArray<Model.Emoji> {
+    return this._db
+      .prepare(
+        dedent`\
+        SELECT DISTINCT
+          emoji
+        FROM message_reactions
+        WHERE channel_id = :channel_id
+          AND message_id = :message_id`
+      )
+      .all({channel_id: channel, message_id: message})
+      .map((e) => Model.refToEmoji(e.emoji));
+  }
+
+  reactions(
+    channel: Model.Snowflake,
+    message: Model.Snowflake
+  ): $ReadOnlyArray<Model.Reaction> {
+    return this._db
+      .prepare(
+        dedent`\
+        SELECT
+          channel_id,
+          message_id,
+          author_id,
+          emoji
+        FROM message_reactions
+        WHERE channel_id = :channel_id
+          AND message_id = :message_id`
+      )
+      .all({channel_id: channel, message_id: message})
+      .map((r) => ({
+        channelId: r.channel_id,
+        messageId: r.message_id,
+        authorId: r.author_id,
+        emoji: Model.refToEmoji(r.emoji),
+      }));
+  }
+
+  addChannel(channel: Model.Channel) {
+    this._db
+      .prepare(
+        dedent`\
+          INSERT OR IGNORE INTO channels (
+              id,
+              type,
+              name
+          ) VALUES (
+              :id,
+              :type,
+              :name
+          )
+        `
+      )
+      .run({
+        id: channel.id,
+        type: channel.type,
+        name: channel.name,
+      });
+  }
+
+  addMessage(message: Model.Message) {
+    this._db
+      .prepare(
+        dedent`\
+          INSERT OR IGNORE INTO messages (
+              id,
+              channel_id,
+              author_id,
+              non_user_author,
+              timestamp_ms,
+              content
+          ) VALUES (
+              :id,
+              :channel_id,
+              :author_id,
+              :non_user_author,
+              :timestamp_ms,
+              :content
+          )
+        `
+      )
+      .run({
+        id: message.id,
+        channel_id: message.channelId,
+        author_id: message.authorId,
+        non_user_author: Number(message.nonUserAuthor),
+        timestamp_ms: message.timestampMs,
+        content: message.content,
+      });
+
+    for (const user of message.mentions) {
+      this.addMention(message, user);
+    }
+  }
+
+  addReaction(reaction: Model.Reaction) {
+    this._db
+      .prepare(
+        dedent`\
+          INSERT OR IGNORE INTO message_reactions (
+              channel_id,
+              message_id,
+              author_id,
+              emoji
+          ) VALUES (
+              :channel_id,
+              :message_id,
+              :author_id,
+              :emoji
+          )
+        `
+      )
+      .run({
+        channel_id: reaction.channelId,
+        message_id: reaction.messageId,
+        author_id: reaction.authorId,
+        emoji: Model.emojiToRef(reaction.emoji),
+      });
+  }
+
+  addMention(message: Model.Message, user: Model.Snowflake) {
+    this._db
+      .prepare(
+        dedent`\
+          INSERT OR IGNORE INTO message_mentions (
+              channel_id,
+              message_id,
+              user_id
+          ) VALUES (
+              :channel_id,
+              :message_id,
+              :user_id
+          )
+        `
+      )
+      .run({
+        channel_id: message.channelId,
+        message_id: message.id,
+        user_id: user,
+      });
+  }
+
+  addMember(member: Model.GuildMember) {
+    this._db
+      .prepare(
+        dedent`\
+          INSERT OR IGNORE INTO members (
+              user_id,
+              username,
+              discriminator,
+              bot,
+              nick
+          ) VALUES (
+              :user_id,
+              :username,
+              :discriminator,
+              :bot,
+              :nick
+          )
+        `
+      )
+      .run({
+        user_id: member.user.id,
+        username: member.user.username,
+        discriminator: member.user.discriminator,
+        bot: Number(member.user.bot),
+        nick: member.nick,
+      });
+
+    for (const role of member.roles) {
+      this.addMemberRole(member.user.id, role);
+    }
+  }
+
+  addMemberRole(user: Model.Snowflake, role: Model.Snowflake) {
+    this._db
+      .prepare(
+        dedent`\
+          INSERT OR IGNORE INTO member_roles (
+              user_id,
+              role
+          ) VALUES (
+              :user_id,
+              :role
+          )
+        `
+      )
+      .run({
+        user_id: user,
+        role,
+      });
+  }
+}
--- a/src/plugins/experimental-discord/mockSnapshotFetcher.js
+++ b/src/plugins/experimental-discord/mockSnapshotFetcher.js
@ -0,0 +1,24 @@
+// @flow
+
+import base64url from "base64url";
+import path from "path";
+import fs from "fs-extra";
+import {Fetcher} from "./fetcher";
+
+async function snapshotFetch(url: string | Request | URL): Promise<Response> {
+  const snapshotDir = "src/plugins/experimental-discord/snapshots";
+  const filename = base64url(url);
+  const file = path.join(snapshotDir, filename);
+  if (await fs.exists(file)) {
+    const contents = await fs.readFile(file);
+    return new Response(contents, {status: 200});
+  } else {
+    throw new Error(`couldn't load snapshot for ${file} (${String(url)})`);
+  }
+}
+
+export const snapshotFetcher = () =>
+  new Fetcher({
+    fetch: snapshotFetch,
+    token: "mock-token",
+  });
--- a/src/plugins/experimental-discord/models.js
+++ b/src/plugins/experimental-discord/models.js
@ -0,0 +1,112 @@
+// @flow
+
+// https://discordapp.com/developers/docs/reference#snowflakes
+export type Snowflake = string;
+export const ZeroSnowflake: Snowflake = "0";
+
+export type Guild = {|
+  +id: Snowflake,
+  +name: string,
+  +permissions: number,
+|};
+
+export type BotToken = string;
+
+// https://discordapp.com/developers/docs/resources/channel#channel-object-channel-types
+export type ChannelType =
+  | "GUILD_TEXT"
+  | "DM"
+  | "GUILD_VOICE"
+  | "GROUP_DM"
+  | "GUILD_CATEGORY"
+  | "GUILD_NEWS"
+  | "GUILD_STORE";
+
+export function channelTypeFromId(id: number): ChannelType {
+  switch (id) {
+    case 0:
+      return "GUILD_TEXT";
+    case 1:
+      return "DM";
+    case 2:
+      return "GUILD_VOICE";
+    case 3:
+      return "GROUP_DM";
+    case 4:
+      return "GUILD_CATEGORY";
+    case 5:
+      return "GUILD_NEWS";
+    case 6:
+      return "GUILD_STORE";
+    default: {
+      throw new Error(`Unknown channel type ID: ${id}`);
+    }
+  }
+}
+
+export type Channel = {|
+  +id: Snowflake,
+  +type: ChannelType,
+  +name: string,
+|};
+
+export type Role = {|
+  +id: Snowflake,
+  +name: string,
+|};
+
+export type User = {|
+  +id: Snowflake,
+  +username: string,
+  +discriminator: string,
+  +bot: boolean,
+|};
+
+export type GuildMember = {|
+  +user: User,
+  +nick: string | null,
+  +roles: $ReadOnlyArray<Snowflake>,
+|};
+
+export type Emoji = {|
+  +id: ?Snowflake,
+  +name: string,
+|};
+
+export type EmojiRef = string;
+
+export function emojiToRef({id, name}: Emoji): EmojiRef {
+  // Built-in emoji, unicode names.
+  if (!id) return name;
+
+  // Custom emoji.
+  return `${name}:${id}`;
+}
+
+export function refToEmoji(ref: EmojiRef): Emoji {
+  const [name, id] = ref.split(":");
+  if (!id) return {id: null, name};
+  return {id, name};
+}
+
+export type Message = {|
+  +id: Snowflake,
+  +channelId: Snowflake,
+  +authorId: Snowflake,
+  // Could be a message from a webhook, meaning the authorId isn't a user.
+  +nonUserAuthor: boolean,
+  +timestampMs: number,
+  +content: string,
+  // Normally includes reaction counters, but we don't care about counters.
+  // We could filter based on which types of emoji have been added though.
+  +reactionEmoji: $ReadOnlyArray<Emoji>,
+  // Snowflake of user IDs.
+  +mentions: $ReadOnlyArray<Snowflake>,
+|};
+
+export type Reaction = {|
+  +channelId: Snowflake,
+  +messageId: Snowflake,
+  +authorId: Snowflake,
+  +emoji: Emoji,
+|};
--- a/src/plugins/experimental-discord/params.js
+++ b/src/plugins/experimental-discord/params.js
@ -0,0 +1,11 @@
+// @flow
+
+import * as Model from "./models";
+import {type EmojiWeightMap} from "./createGraph";
+
+export type {BotToken as DiscordToken} from "./models";
+
+export type ProjectOptions = {|
+  +guildId: Model.Snowflake,
+  +reactionWeights: EmojiWeightMap,
+|};
--- a/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvY2hhbm5lbHMvNjc4MzQ4OTgwODQ5MjEzNDcyL21lc3NhZ2VzLzY3ODY5NzM1MDM4NTg5MzQwNC9yZWFjdGlvbnMvc291cmNlY3JlZDo2NzgzOTkzNjQ0MTg1MDI2Njk_YWZ0ZXI9MCZsaW1pdD01
+++ b/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvY2hhbm5lbHMvNjc4MzQ4OTgwODQ5MjEzNDcyL21lc3NhZ2VzLzY3ODY5NzM1MDM4NTg5MzQwNC9yZWFjdGlvbnMvc291cmNlY3JlZDo2NzgzOTkzNjQ0MTg1MDI2Njk_YWZ0ZXI9MCZsaW1pdD01
@ -0,0 +1,16 @@
+[
+  {
+    "id": "143776454050709505",
+    "username": "Beanow",
+    "avatar": "6496446fe1455f31f9536b132dcc4ac8",
+    "discriminator": "5887",
+    "public_flags": 0
+  },
+  {
+    "id": "439050857921904640",
+    "username": "Brian Litwin",
+    "avatar": "1cc439c3506ede04a77be8105d934df4",
+    "discriminator": "2386",
+    "public_flags": 0
+  }
+]
--- a/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvY2hhbm5lbHMvNjc4MzQ4OTgwODQ5MjEzNDcyL21lc3NhZ2VzP2FmdGVyPTAmbGltaXQ9MTA
+++ b/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvY2hhbm5lbHMvNjc4MzQ4OTgwODQ5MjEzNDcyL21lc3NhZ2VzP2FmdGVyPTAmbGltaXQ9MTA
@ -0,0 +1,224 @@
+[
+  {
+    "id": "678697350385893404",
+    "type": 0,
+    "content": "@here could each of you add one message to <#678696874869522446>? Content doesn't matter :]",
+    "channel_id": "678348980849213472",
+    "author": {
+      "id": "143776454050709505",
+      "username": "Beanow",
+      "avatar": "6496446fe1455f31f9536b132dcc4ac8",
+      "discriminator": "5887"
+    },
+    "attachments": [],
+    "embeds": [],
+    "mentions": [],
+    "mention_roles": [],
+    "pinned": false,
+    "mention_everyone": true,
+    "tts": false,
+    "timestamp": "2020-02-16T20:20:57.919000+00:00",
+    "edited_timestamp": null,
+    "flags": 0,
+    "reactions": [
+      {
+        "emoji": {
+          "id": "678399364418502669",
+          "name": "sourcecred"
+        },
+        "count": 1,
+        "me": false
+      },
+      {
+        "emoji": {
+          "id": null,
+          "name": "👍"
+        },
+        "count": 1,
+        "me": false
+      },
+      {
+        "emoji": {
+          "id": null,
+          "name": "🐙"
+        },
+        "count": 1,
+        "me": false
+      },
+      {
+        "emoji": {
+          "id": null,
+          "name": "🌱"
+        },
+        "count": 1,
+        "me": false
+      },
+      {
+        "emoji": {
+          "id": null,
+          "name": "🔥"
+        },
+        "count": 1,
+        "me": false
+      },
+      {
+        "emoji": {
+          "id": null,
+          "name": "❤️"
+        },
+        "count": 1,
+        "me": false
+      },
+      {
+        "emoji": {
+          "id": null,
+          "name": "💯"
+        },
+        "count": 1,
+        "me": false
+      }
+    ]
+  },
+  {
+    "id": "678401508219420682",
+    "type": 7,
+    "content": "",
+    "channel_id": "678348980849213472",
+    "author": {
+      "id": "439050857921904640",
+      "username": "Brian Litwin",
+      "avatar": "1cc439c3506ede04a77be8105d934df4",
+      "discriminator": "2386"
+    },
+    "attachments": [],
+    "embeds": [],
+    "mentions": [],
+    "mention_roles": [],
+    "pinned": false,
+    "mention_everyone": false,
+    "tts": false,
+    "timestamp": "2020-02-16T00:45:23.650000+00:00",
+    "edited_timestamp": null,
+    "flags": 0
+  },
+  {
+    "id": "678370372390748199",
+    "type": 0,
+    "content": "Made <@!420341518948237331> and <@!432981598858903585> admins 😄",
+    "channel_id": "678348980849213472",
+    "author": {
+      "id": "143776454050709505",
+      "username": "Beanow",
+      "avatar": "6496446fe1455f31f9536b132dcc4ac8",
+      "discriminator": "5887"
+    },
+    "attachments": [],
+    "embeds": [],
+    "mentions": [
+      {
+        "id": "432981598858903585",
+        "username": "wchargin",
+        "avatar": "012988df3eab485878fd588696097802",
+        "discriminator": "8658"
+      },
+      {
+        "id": "420341518948237331",
+        "username": "decentralion",
+        "avatar": "d54a9b690fd2e47abd4268c55cc25b8f",
+        "discriminator": "8636"
+      }
+    ],
+    "mention_roles": [],
+    "pinned": false,
+    "mention_everyone": false,
+    "tts": false,
+    "timestamp": "2020-02-15T22:41:40.290000+00:00",
+    "edited_timestamp": "2020-02-16T00:06:41.114000+00:00",
+    "flags": 0,
+    "reactions": [
+      {
+        "emoji": {
+          "id": null,
+          "name": "👀"
+        },
+        "count": 1,
+        "me": false
+      },
+      {
+        "emoji": {
+          "id": null,
+          "name": "👍"
+        },
+        "count": 1,
+        "me": false
+      }
+    ]
+  },
+  {
+    "id": "678367818013737031",
+    "type": 7,
+    "content": "",
+    "channel_id": "678348980849213472",
+    "author": {
+      "id": "420341518948237331",
+      "username": "decentralion",
+      "avatar": "d54a9b690fd2e47abd4268c55cc25b8f",
+      "discriminator": "8636"
+    },
+    "attachments": [],
+    "embeds": [],
+    "mentions": [],
+    "mention_roles": [],
+    "pinned": false,
+    "mention_everyone": false,
+    "tts": false,
+    "timestamp": "2020-02-15T22:31:31.279000+00:00",
+    "edited_timestamp": null,
+    "flags": 0
+  },
+  {
+    "id": "678365403600257034",
+    "type": 7,
+    "content": "",
+    "channel_id": "678348980849213472",
+    "author": {
+      "id": "432981598858903585",
+      "username": "wchargin",
+      "avatar": "012988df3eab485878fd588696097802",
+      "discriminator": "8658"
+    },
+    "attachments": [],
+    "embeds": [],
+    "mentions": [],
+    "mention_roles": [],
+    "pinned": false,
+    "mention_everyone": false,
+    "tts": false,
+    "timestamp": "2020-02-15T22:21:55.638000+00:00",
+    "edited_timestamp": null,
+    "flags": 0
+  },
+  {
+    "id": "678359229685563412",
+    "type": 7,
+    "content": "",
+    "channel_id": "678348980849213472",
+    "author": {
+      "id": "678351352770068560",
+      "username": "CredBot-Beanow",
+      "avatar": "04fdfc8af8cca3c0b3155a946dccc435",
+      "discriminator": "1705",
+      "bot": true
+    },
+    "attachments": [],
+    "embeds": [],
+    "mentions": [],
+    "mention_roles": [],
+    "pinned": false,
+    "mention_everyone": false,
+    "tts": false,
+    "timestamp": "2020-02-15T21:57:23.662000+00:00",
+    "edited_timestamp": null,
+    "flags": 0
+  }
+]
--- a/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvY2hhbm5lbHMvNjc4MzQ4OTgwODQ5MjEzNDcyL21lc3NhZ2VzP2FmdGVyPTAmbGltaXQ9NQ
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--- a/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvY2hhbm5lbHMvNjc4Mzk0NDA2NTA3OTA1MTI5L21lc3NhZ2VzP2FmdGVyPTY3ODM5NDQ5ODA5ODY1OTM0OSZsaW1pdD0xMA
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@ -0,0 +1 @@
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--- a/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvY2hhbm5lbHMvNjc4Mzk0NDA2NTA3OTA1MTI5L21lc3NhZ2VzP2FmdGVyPTY3ODM5NDQzNjc1NzA5NDQxMCZsaW1pdD01
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--- a/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvZ3VpbGRzLzY3ODM0ODk4MDYzOTQ5ODQyOA
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@ -0,0 +1,87 @@
+{
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+  "discovery_splash": null,
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+  "max_members": 250000,
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+  "embed_enabled": false,
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+}
--- a/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvZ3VpbGRzLzY3ODM0ODk4MDYzOTQ5ODQyOC9jaGFubmVscw
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@ -0,0 +1,73 @@
+[
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+  {
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+    "type": 0,
+    "name": "pagination",
+    "position": 1,
+    "parent_id": "678348980756938813",
+    "topic": "A known length of messages to test pagination.",
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+    "rate_limit_per_user": 0
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+  {
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+    "type": 0,
+    "name": "notmymessage",
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+    "parent_id": "678348980756938813",
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+]
--- a/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvZ3VpbGRzLzY3ODM0ODk4MDYzOTQ5ODQyOC9lbW9qaXM
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@ -0,0 +1,11 @@
+[
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+    "id": "678399364418502669",
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+]
--- a/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvZ3VpbGRzLzY3ODM0ODk4MDYzOTQ5ODQyOC9tZW1iZXJzP2FmdGVyPTAmbGltaXQ9NQ
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@ -0,0 +1,92 @@
+[
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+      "678350026946117694"
+    ],
+    "nick": null,
+    "premium_since": null,
+    "mute": false,
+    "deaf": false,
+    "joined_at": "2020-02-15T21:16:40.215000+00:00"
+  },
+  {
+    "user": {
+      "id": "420341518948237331",
+      "username": "decentralion",
+      "avatar": "a70b70bc0471e6a1efe5124c39c76020",
+      "discriminator": "8636",
+      "public_flags": 0
+    },
+    "roles": [
+      "678349848684003359",
+      "678350026946117694"
+    ],
+    "nick": null,
+    "premium_since": null,
+    "mute": false,
+    "deaf": false,
+    "joined_at": "2020-02-15T22:31:31.243000+00:00"
+  },
+  {
+    "user": {
+      "id": "432981598858903585",
+      "username": "wchargin",
+      "avatar": "012988df3eab485878fd588696097802",
+      "discriminator": "8658",
+      "public_flags": 0
+    },
+    "roles": [
+      "678349848684003359",
+      "678350026946117694"
+    ],
+    "nick": null,
+    "premium_since": null,
+    "mute": false,
+    "deaf": false,
+    "joined_at": "2020-02-15T22:21:55.613000+00:00"
+  },
+  {
+    "user": {
+      "id": "439050857921904640",
+      "username": "Brian Litwin",
+      "avatar": "1cc439c3506ede04a77be8105d934df4",
+      "discriminator": "2386",
+      "public_flags": 0
+    },
+    "roles": [
+      "678349848684003359",
+      "678350026946117694"
+    ],
+    "nick": null,
+    "premium_since": null,
+    "mute": false,
+    "deaf": false,
+    "joined_at": "2020-02-16T00:45:23.478000+00:00"
+  },
+  {
+    "user": {
+      "id": "678351352770068560",
+      "username": "CredBot-Beanow",
+      "avatar": "6f5b83041061a114c9f0fb26b863622c",
+      "discriminator": "1705",
+      "public_flags": 0,
+      "bot": true
+    },
+    "roles": [
+      "678359229433905152"
+    ],
+    "nick": null,
+    "premium_since": null,
+    "mute": false,
+    "deaf": false,
+    "joined_at": "2020-02-15T21:57:23.609000+00:00"
+  }
+]
--- a/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvZ3VpbGRzLzY3ODM0ODk4MDYzOTQ5ODQyOC9tZW1iZXJzP2xpbWl0PTEwMDA
+++ b/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvZ3VpbGRzLzY3ODM0ODk4MDYzOTQ5ODQyOC9tZW1iZXJzP2xpbWl0PTEwMDA
@ -0,0 +1,87 @@
+[
+  {
+    "user": {
+      "id": "143776454050709505",
+      "username": "Beanow",
+      "avatar": "6496446fe1455f31f9536b132dcc4ac8",
+      "discriminator": "5887"
+    },
+    "roles": [
+      "678349848684003359",
+      "678350026946117694"
+    ],
+    "nick": null,
+    "premium_since": null,
+    "mute": false,
+    "deaf": false,
+    "joined_at": "2020-02-15T21:16:40.215000+00:00"
+  },
+  {
+    "user": {
+      "id": "420341518948237331",
+      "username": "decentralion",
+      "avatar": "d54a9b690fd2e47abd4268c55cc25b8f",
+      "discriminator": "8636"
+    },
+    "roles": [
+      "678349848684003359",
+      "678350026946117694"
+    ],
+    "nick": null,
+    "premium_since": null,
+    "mute": false,
+    "deaf": false,
+    "joined_at": "2020-02-15T22:31:31.243000+00:00"
+  },
+  {
+    "user": {
+      "id": "432981598858903585",
+      "username": "wchargin",
+      "avatar": "012988df3eab485878fd588696097802",
+      "discriminator": "8658"
+    },
+    "roles": [
+      "678349848684003359",
+      "678350026946117694"
+    ],
+    "nick": null,
+    "premium_since": null,
+    "mute": false,
+    "deaf": false,
+    "joined_at": "2020-02-15T22:21:55.613000+00:00"
+  },
+  {
+    "user": {
+      "id": "439050857921904640",
+      "username": "Brian Litwin",
+      "avatar": "1cc439c3506ede04a77be8105d934df4",
+      "discriminator": "2386"
+    },
+    "roles": [
+      "678349848684003359",
+      "678350026946117694"
+    ],
+    "nick": null,
+    "premium_since": null,
+    "mute": false,
+    "deaf": false,
+    "joined_at": "2020-02-16T00:45:23.478000+00:00"
+  },
+  {
+    "user": {
+      "id": "678351352770068560",
+      "username": "CredBot-Beanow",
+      "avatar": "04fdfc8af8cca3c0b3155a946dccc435",
+      "discriminator": "1705",
+      "bot": true
+    },
+    "roles": [
+      "678359229433905152"
+    ],
+    "nick": null,
+    "premium_since": null,
+    "mute": false,
+    "deaf": false,
+    "joined_at": "2020-02-15T21:57:23.609000+00:00"
+  }
+]
--- a/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvZ3VpbGRzLzY3ODM0ODk4MDYzOTQ5ODQyOC9yb2xlcw
+++ b/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvZ3VpbGRzLzY3ODM0ODk4MDYzOTQ5ODQyOC9yb2xlcw
@ -0,0 +1,42 @@
+[
+  {
+    "id": "678348980639498428",
+    "name": "@everyone",
+    "permissions": 33620992,
+    "position": 0,
+    "color": 0,
+    "hoist": false,
+    "managed": false,
+    "mentionable": false
+  },
+  {
+    "id": "678349848684003359",
+    "name": "allow-adding-data",
+    "permissions": 104324673,
+    "position": 1,
+    "color": 2123412,
+    "hoist": false,
+    "managed": false,
+    "mentionable": false
+  },
+  {
+    "id": "678350026946117694",
+    "name": "admins",
+    "permissions": 104324681,
+    "position": 2,
+    "color": 15105570,
+    "hoist": false,
+    "managed": false,
+    "mentionable": false
+  },
+  {
+    "id": "678359229433905152",
+    "name": "CredBot-Beanow",
+    "permissions": 66560,
+    "position": 1,
+    "color": 0,
+    "hoist": false,
+    "managed": true,
+    "mentionable": false
+  }
+]
--- a/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvdXNlcnMvQG1lL2d1aWxkcw
+++ b/src/plugins/experimental-discord/snapshots/aHR0cHM6Ly9kaXNjb3JkYXBwLmNvbS9hcGkvdXNlcnMvQG1lL2d1aWxkcw
@ -0,0 +1,26 @@
+[
+  {
+    "id": "453243919774253079",
+    "name": "sourcecred",
+    "icon": "934f3f7c5d6df1d014c55c1760090d7d",
+    "owner": false,
+    "permissions": 104193601,
+    "features": []
+  },
+  {
+    "id": "629411177947987986",
+    "name": "MetaGame",
+    "icon": "e3602d4e34004a5053e4d43d81cf8291",
+    "owner": false,
+    "permissions": 104324673,
+    "features": []
+  },
+  {
+    "id": "678348980639498428",
+    "name": "SourceCred Test Server",
+    "icon": null,
+    "owner": false,
+    "permissions": 33620992,
+    "features": []
+  }
+]
--- a/src/plugins/experimental-discord/update_discord_api_snapshots.sh
+++ b/src/plugins/experimental-discord/update_discord_api_snapshots.sh
@ -0,0 +1,40 @@
+#!/bin/bash
+
+set -eu
+
+snapshots_dir=src/plugins/experimental-discord/snapshots
+test_instance_url="https://discordapp.com/api"
+
+if [ ! "$(jq --version)" ]; then
+  printf >&2 'This script depends on jq. Please install it.\n'
+  exit 1
+fi
+
+if [ -z "${SOURCECRED_DISCORD_BOT_TOKEN:-}" ]; then
+  printf >&2 "Please set the SOURCECRED_DISCORD_TOKEN environment variable.\n"
+  exit 1
+fi
+
+toplevel="$(git -C "$(dirname "$0")" rev-parse --show-toplevel)"
+cd "${toplevel}"
+
+fetch() {
+  url="${test_instance_url}$1"
+  filename="$(printf '%s' "${url}" | base64 -w 0 | tr -d '=' | tr '/+' '_-')"
+  path="${snapshots_dir}/${filename}"
+  curl -sfL "$url" \
+    -H "Accept: application/json" \
+    -H "Authorization: Bot ${SOURCECRED_DISCORD_BOT_TOKEN}" \
+    | jq '.' > "${path}"
+}
+
+rm -r "${snapshots_dir}"
+mkdir "${snapshots_dir}"
+fetch "/guilds/678348980639498428"
+fetch "/guilds/678348980639498428/channels"
+fetch "/guilds/678348980639498428/members?after=0&limit=5"
+fetch "/channels/678348980849213472/messages?after=0&limit=5"
+fetch "/channels/678394406507905129/messages?after=0&limit=5"
+fetch "/channels/678394406507905129/messages?after=678394436757094410&limit=5"
+fetch "/channels/678394406507905129/messages?after=678394455849566208&limit=5"
+fetch "/channels/678348980849213472/messages/678697350385893404/reactions/sourcecred:678399364418502669?after=0&limit=5"