I added a lot of new comments that have url references to different
types of GitHub entities, e.g. to pull request review comments.
The commit was generated by running the example repo fetcher, and
running yarn test and updating snapshots.
Summary:
Flow didn’t catch this because all the payloads are `{}` anyway.
Test Plan:
Note that every node and edge payload is now listed exactly once in the
correct spot for each of `{Node,Edge}{Type,Payload}`.
wchargin-branch: git-nodepayload
This method removes `Graph.inEdges` and `Graph.outEdges`. As a
replacement to these two functions, `graph.neighborhood` now takes an
optional `direction` flag, which can be set to `"IN" | "OUT" | "ANY"`.
This reduces the surface area of the Graph API, and means that the same
pattern can be used when requesting in or out neighbors as is used when
requesting all neighbors.
This change generates significant churn in the test files, and in some
cases the tests are less elegant / show historicity, as they were
written for the type signature of `{in,out}Edges`, which just returns an
array of edges, and now receive an array of neighbors. I think this is
acceptable, and it's not worth re-writing the test.
In many cases, replacing existing calls to `{in,out}Edges` in our actual
codebase resulted in cleaner code, as `neighborhood` successfully
abstracts over the common patterns that users of `{in,out}Edges` were
implementing.
As a fly-by refactor, I also changed the `neighborAddress` part of the
`neighborhood` return value to `neighbor`. It's a little less
descriptive, but it's more concise, and flow is there to help ensure
it's used correctly.
Test plan: Note that CI passes. Inspect the test changes, and verify
that they are appropriate transformations for consuming the new API.
Test Plan:
This snapshot test is too unwieldy to actually read—it’s 1000 lines of
opaque SHAs and thrice-stringified JSON objects—so it should be
interpreted as a regression test only. The programmatic tests should
suffice.
wchargin-branch: wip-git-create-graph
Test Plan:
Run `yarn lint` and `yarn travis` and observe success. Add something
that triggers a lint warning, like `const zzz = 3;`; re-run and observe
failures.
wchargin-branch: lint
In general, methods in the porcelain GitHub api may return multiple
types; e.g. a reference could be to an Issue, PullRequest, Comment,
Author (or more). To make working with the api more convenient while
maintaining safety, this commit adds a static `asType` method to each
Entity class, which confirms that type coercion is safe, and errors if
not.
This commit also adds `issueOrPRByNumber`, a convenience method, to
api.test.js.
Test plan: Check the API usage and verify that it is reasonable.
Interacting with raw contribution graphs is cumbersome. We'll need
more fluent and convenient ways to retrieve data from them; we can do
this by creating porcelain APIs that wrap the underlying graph.
This commit adds a simple porcelain API for the GitHub data. It creates
the following classes:
* `api.Repository`
* `api.Issue`
* `api.PullRequest`
* `api.Comment`
* `api.Author`
The classes all wrap a graph and a nodeAddress. They provide read-only
functions for retreiving data from the graph; that data might be a part
of the node payload, or it might do some graph traversal under the hood.
The choice to have the wrapper hold onto the Address rather than the
node itself was deliberate; in the future, the graph may contain nodes
that are not synchronously reachable, so this approach allows us to
create wrappers for nodes we can't synchronously reach. When this comes
up in practice, we can then add async methods to the wrapper.
Note that some data already included in our graph, such as
PullRequestReviews and PullRequestReviewComments, were deliberately
excluded, so as to allow the core ideas to be reviewed without
unnecessary clutter.
Test plan:
Check that the unit tests appropriately test the behavior, and that the
API seems pleasant to use.
Summary:
Two reasons for this. First, we want tests to be able to operate on this
data without having to generate repositories via `git(1)`. (Doing that
is slow, and requires a Git installation, and makes it less clear that
the tests are correctly isolated/provides more surface area for
something to go wrong.) Second, in general plugins will need a canonical
source of test data, so setting/continuing this precedent is a good
thing.
Test Plan:
Observe that the old Jest snapshot must be equivalent to the new JSON
one, because the test criterion in `loadRepository.test.js` changed and
the test still passes. Then, run `loadRepositoryTest.sh` and note that
it passes; change the `example-git.json` file and note that the test
fails when re-run; then, run the test with `--updateSnapshot` and watch
it magically revert your changes.
wchargin-branch: check-in-git-repo
Summary:
I’d like to use `Map`s whenever the keys are homogeneous (i.e.,
dictionaries, not structs). But this has proven infeasible. The primary
issue at this point is that `JSON.stringify(anyMap)` is `"{}"`—not
entirely unreasonable given that maps can have non-string keys, but
frustrating enough to not use them.
Test Plan:
Jest appears to order the snapshot keys differently for `Map`s and
objects (the former by insertion order and the latter alphabetical),
which makes the snapshot change harder to read. I verified that the
general structure is okay, and hand-verified some of the individual
changes. Noting that the number of lines added and deleted in the
snapshot is a good sanity check.
wchargin-branch: map-to-object
When requesting nodes and edges from the graph, it is convenient to
filter them by their type.
In the future, we should add plugin filtering as well, as we
expect type names to collide across plugins.
We may also want to consider keeping a cache of nodes and edges by type
to speed up these calls, if they become performance bottlenecks. (The
implementation in this commit naively iterates over every node/edge.)
Test plan:
Verify that the unit tests are appropriate.
Currently, we store GitHub Users, Organizations, and Bots as separate
nodetypes in the graph. This is inconvenient, as we don't care very much
what type of entity authored a node.
This commit collapses those three categories into one nodetype. The
extra information has migrated to the node payload, so it is still
possible to discover this information if it's important.
Test plan: There is some amount of snapshot churn because the author
node types and payloads have changed. Verify that the snapshot changes
are appropriate, and that CI passes.
This commit renames the following graph functions:
* `get{Node,Edge}{,s}` -> `{node,edge}{,s}`
* `get{In,Out}Edges` -> `{in,out}Edges`
* `getNeighborhood` -> `neighborhood`
The rename was effected across the repo by running:
```
$ find src -name "*.js" -exec sed -i 's/getNeighborhood/neighborhood/g' {} +
```
modified appropriately for each subsitution.
Test plan:
Inspect the code to make sure nothing was erronously renamed. Check that
CI passes.
`Graph.getAdjacentEdges` had a serious defect: for the adjacent edges,
it's hard to tell which of the {src,dst} is the neighboring node address
and which is the node we called `getAdjacentEdges` on.
This commit fixes that limitation by replacing `getAdjacentEdges` with
`getNeighborhood`, with a return signature of
`{edge: Edge<EP>, neighborAddress: Address}[]`
Some yak shaving was required: we needed a version of `expectSameSorted`
and, by extension, `sortedByAddress` that takes an accessor to an
Addressable, so that we could test that the neighborhoods returned were
correct. To satisfy flow, I created `expectSameSortedAccessorized` and
`sortedByAddressAccessorized`. Cumbersome, but it worked. ¯\_(ツ)_/¯
Previously, the address module exported `sortedByAddress`, a utility
function that sorts an array of `Addressable`s. This function was only
used in test code.
This commit replaces it with generic usage of `lodash.sortBy`. This
reduces the API surface area of the module, and removes test-only code
from the exported api.
New dependency added: `lodash.sortby`
https://www.npmjs.com/package/lodash.sortby
Test Plan:
Run the script with `--dry-run`, which currently prints
```shell
$ src/plugins/git/demoData/synchronizeToGithub.sh -n
yarn run v1.5.1
[build output truncated]
Build completed; results in 'bin'.
Done in 3.30s.
Synchronizing: example-git
warning: no common commits
To github.com:sourcecred/example-git.git
+ 3507b7c...3715ddf HEAD -> master (forced update)
Synchronizing: example-git-submodule
Everything up-to-date
Done.
```
This reflects the correct state of affairs, because #158 changed the
example repository. Note that the `3715ddf` SHA in the output of the
above script matches the SHA in the `exampleRepo.test.js.snap` snapshot.
wchargin-branch: sync-git-example-repos
Summary:
When we shell out to `git`, we don’t want the end user’s environment
variables and Git configuration to influence the results. This commit
standardizes those inputs. Standardizing the environment has the side
benefit that the `GIT_DIR` environment variable is not set, which means
that the test suite will work properly when run from the `exec` step of
a Git rebase.
Test Plan:
Tests pass and snapshots are unchanged. Note that
```shell
$ git rebase HEAD --exec 'CI=1 yarn test'
```
works after this commit but not before it.
wchargin-branch: standardize-git-environment
Summary:
Using `array.join()` added commas at the start of some lines; I meant to
use `array.join("")`.
(I’ve now inspected the full generated contents of both repos, and they
look good.)
Test Plan:
It is expected that these attributes of the snapshots should change.
There’s no need to carefully check the SHAs.
wchargin-branch: readme-change
Some consumers of the graph may prefer to treat it as an undirected
graph. For example, when finding the author of an issue, it is wholly
sufficient to find an edge with the `AUTHORS` type; the caller may
prefer not to be bothered with remembering which end of the `AUTHORS`
end is considered the `src` and which is the `dst`.
The `getAdjacentEdges` call enables that, by combining the output of
`getInEdges` and `getOutEdges`.
Test plan:
The new tests are pretty comprehensive.
Summary:
The main example repository now covers the currently desired features:
it has blobs, subtrees, and submodules, and commits that change each of
these. (We don’t have merge commits yet—we can add those once we start
to care about them.)
Once this is merged, I will push the two repositories to GitHub.
Test Plan:
Verifying and understanding is easier than ever before. You can run the
following commands to create the repositories in question on your disk:
```shell
$ yarn backend
$ node bin/createExampleRepo.js /tmp/repo
$ node bin/createExampleRepo.js --submodule /tmp/subrepo
```
You can then explore these repositories at your leisure. For instance,
to check that the `loadRepository` snapshot has the right set of
commits, inspect the output of the following command:
```shell
$ git -C /tmp/repo log --format='%H %T'
```
Or, to check that a particular tree has the right contents, just run:
```shell
$ git -C /tmp/repo ls-tree TREE_SHA
```
Verifying the `exampleRepo` snapshot is similarly easy: just check that
the lists of commit SHAs in `/tmp/repo` and `/tmp/subrepo` are correct.
wchargin-branch: include-submodule
Summary:
We’ll use this to create the repositories on disk and then push them to
GitHub.
Test Plan:
Generate both kinds of repository, and check out the SHAs:
```shell
$ yarn backend
$ node bin/createExampleRepo.js /tmp/repo
$ node bin/createExampleRepo.js --submodule /tmp/repo-submodule
$ node bin/createExampleRepo.js --no-submodule /tmp/repo-no-submodule
$ # (first and third lines do the same thing)
$ git -C /tmp/repo rev-parse HEAD
677b340674bde17fdaac3b5f5eef929139ef2a52
$ git -C /tmp/repo-submodule rev-parse HEAD
29ef158bc982733e2ba429fcf73e2f7562244188
$ git -C /tmp/repo-no-submodule rev-parse HEAD
677b340674bde17fdaac3b5f5eef929139ef2a52
```
Then, note that these SHAs are expected per the snapshot file in
`exampleRepo.test.js.snap`.
wchargin-branch: create-example-repo-command
Summary:
We want our main repository to include submodules so that we can test
submodule support. Here, we create a repository to be included as a
submodule.
wchargin-branch: example-submodule-repository
Summary:
The `loadRepository` test tries to clean up temporary directories, but
failed to do so because the directories were not empty. The cleanup hook
threw an error, but this error was silenced by Jest due to [a known
bug][1] that was fixed a few days ago. We can fix this by asking `tmp`
to clean up directories even if they are not empty, using the
`unsafeCleanup` option.
[1]: https://github.com/facebook/jest/issues/3266
Test Plan:
While running `watch -n 0.1 'ls /tmp | grep "tmp-.*" | wc -l'`, run
tests. Note that the number increases by five and then drops down again;
before this patch, it would increase by 5 and then stay there.
wchargin-branch: clean-up-tmpdirs
Summary:
A few reasons for this:
1. This _is_ a utility, so it makes sense semantically.
2. This unifies the utilities API; clients like `loadRepository.test`
don’t have to keep around both a `git` and a `gitUtils`.
3. Most importantly, further scripts and tests shouldn’t depend on
`loadRepository` just for `localGit`. Depending on `gitUtils` makes
much more sense.
(Note that `makeUtils` is no longer dependency-injectable, but that’s
okay; I considered this and favored YAGNI on this one.)
Test Plan:
Existing unit tests pass.
wchargin-branch: move-localgit
Summary:
Utilities like `deterministicCommit` provide valuable functionality that
we will want to use in other scripts and perhaps other test cases. It
makes sense to factor these out into utility functions.
Test Plan:
Existing tests pass.
wchargin-branch: git-utils
This commit adds an optional `typeOptions` argument to Graph.getInEdges
and Graph.getOutEdges. The `typeOptions` allow filtering the returned
edges by the type of the edge, and the type of the node that the edge is
connected to. This makes it much easier to use these methods to find
connections that have a certain relationship, e.g. finding the author of
a commit or the comments on an issue.
Test plan:
A new test suite was written that comprehensively tests this behavior,
both for getInEdges and getOutEdges.
In preparation for using type info in the Graph apis, it is helpful to
have richer type info in the graph demo data.
Test plan: Check that the snapshot changes only consist of type changes,
and that CI passes.
Our GitHub parser is implemented via a `GithubParser` class which builds
the GitHub graph. This is a convenient implementation, but an awkward
API. This commit refactors the module so that it exposes a clean `parse`
function, which ingests the GitHub JSON data and returns as completed
graph.
Test plan:
The unit tests have been re-written to use the new public API. All the
snapshots are unchanged, and flow passes. Additionally, I ran `yarn
start` and verified that the GithubGraphFetcher for the Artifact plugin
is still working.
Summary:
We should be able to get the types without depending on the function to
load a Git repo from disk, and in particular without depending on
`child_process`.
Test Plan:
Flow and tests are sufficient.
wchargin-branch: extract-repository-types
There's some context at #127, in which I initially proposed this change.
In addition to the long-term benefits described in #127, there is a
short-term benefit which is that it makes snapshot tests easier to read,
because the GitHub ids are opaque and unreadable, while the GitHub urls
are relatively easy to parse.
This change results in significant snapshot churn.
Once the type was added, flow correctly discovered a bug in
GithubGraphFetcher.js, which resulted in broken graph fetching in the
ArtifactEditor. Oops! / Good work Flow!
I made `ensureNoMorePages` expect the result it is testing to be an
`any`, which is appropriate for how the function is written (i.e. it is
written in a way that is agnostic to the actual result).
The example-repo.json file is regenerated with large diffs due to the
change in indentation level throughout the file.
Test plan:
Sanity check the snapshot (close inspection is unnecessary due to the
simplicity of the code change). Check that CI pases.
This commit adds flow typing for the JSON result from hitting the GitHub
graphql api. We can't prove that the flow typing is correct, but since
the type definition is colocated with the corresponding fragment
definitions, we can hope that maintainers will maintain both together.
We update the parser to consume the new flow types. There are no flow
errors.
Test plan:
Inspect the flowtypes, verify that they correspond to the data in
example-repo.json, and that there are no flow errors.
Summary:
In this newly added module, we load the structural state of a git
repository into memory. We do not load into memory the contents of any
blobs, so this is not enough information to perform any analysis
requiring file diffing. However, it is sufficient to develop a notion of
“this file was changed in this commit”, by simply diffing the trees.
Test Plan:
Unit tests added; `yarn test` suffices. Reading these snapshots is
pretty easy, even though they’re filled with hashes:
- First, read over the commit specifications on lines 69–83 of
`loadRepository.test.js`, so you know what to expect.
- In the snapshot file, keep handy the time-ordered list of commit
SHAs at the bottom of the file, so that you know which commit SHA is
which.
- To verify that the large snapshot is correct: for each commit, read
the corresponding tree object and make sure that the structure is
correct.
- To verify the small snapshot, just check that it’s the correct
subset of the large snapshot.
- If you want to verify that the SHA for a blob is correct, open a
terminal and run `git hash-object -t blob --stdin`; then, enter the
content of the blob and press `<C-d>`. The result is the blob SHA.
To run a sanity-check on a large repository: apply the following patch:
<details>
<summary>Patch to print out statistics about loaded repository</summary>
```diff
diff --git a/config/paths.js b/config/paths.js
index d2f25fb..8fa2023 100644
--- a/config/paths.js
+++ b/config/paths.js
@@ -62,5 +62,6 @@ module.exports = {
fetchAndPrintGithubRepo: resolveApp(
"src/plugins/github/bin/fetchAndPrintGithubRepo.js"
),
+ loadRepository: resolveApp("src/plugins/git/loadRepository.js"),
},
};
diff --git a/src/plugins/git/loadRepository.js b/src/plugins/git/loadRepository.js
index a76b66c..9380941 100644
--- a/src/plugins/git/loadRepository.js
+++ b/src/plugins/git/loadRepository.js
@@ -106,3 +106,7 @@ function findTrees(git: GitDriver, rootTrees: Set<Hash>): Tree[] {
}
return result;
}
+
+const result = loadRepository(...process.argv.slice(2));
+console.log("commits", result.commits.size);
+console.log("trees", result.trees.size);
```
</details>
Then, run `yarn backend` and put the following script in `test.sh`:
<details>
<summary>Contents for `test.sh`</summary>
```shell
#!/bin/bash
set -eu
repo="$1"
ref="$2"
via_node() {
node bin/loadRepository.js "${repo}" "${ref}"
}
via_git() (
cd "${repo}"
printf 'commits '
git rev-list "${ref}" | wc -l
printf 'trees '
git rev-list "${ref}" |
while read -r commit; do
git rev-parse "${commit}^{tree}"
git ls-tree -rt "${commit}" \
| grep ' tree ' \
| cut -f 1 | cut -d ' ' -f 3
done | sort | uniq | wc -l
)
echo
printf 'Running directly via git...\n'
time a="$(via_git)"
echo
printf 'Running Node script...\n'
time b="$(via_node)"
diff -u <(cat <<<"${a}") <(cat <<<"${b}")
```
</details>
Finally, run `./test.sh /path/to/some/repo origin/master`, and verify
that it exits successfully (zero diff). Here are some timing results on
SourceCred and TensorBoard:
- SourceCred: 0.973s via Node, 0.327s via git.
- TensorBoard: 30.836s via Node, 6.895s via git.
For TensorFlow, running via git takes 7m33.995s. Running via Node fails
with an out-of-memory error after 39 minutes, with 10GB RAM and 4GB
swap. See details below.
<details>
<summary>
Full timing details, commit SHAs, and OOM error message
</summary>
```
+ ./test.sh /home/wchargin/git/sourcecred 01634aabcc
Running directly via git...
real 0m0.327s
user 0m0.016s
sys 0m0.052s
Running Node script...
real 0m0.973s
user 0m0.268s
sys 0m0.176s
+ ./test.sh /home/wchargin/git/tensorboard 7aa1ab9d60671056b8811b7099eec08650f2e4fd
Running directly via git...
real 0m6.895s
user 0m0.600s
sys 0m0.832s
Running Node script...
real 0m30.836s
user 0m3.216s
sys 0m10.588s
+ ./test.sh /home/wchargin/git/tensorflow 968addadfd4e4f5688eedc31f92a9066329ff6a7
Running directly via git...
real 7m33.995s
user 5m21.124s
sys 1m5.476s
Running Node script...
FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory
1: node::Abort() [node]
2: 0x121a2cc [node]
3: v8::Utils::ReportOOMFailure(char const*, bool) [node]
4: v8::internal::V8::FatalProcessOutOfMemory(char const*, bool) [node]
5: v8::internal::Factory::NewFixedArray(int, v8::internal::PretenureFlag) [node]
6: v8::internal::DeoptimizationInputData::New(v8::internal::Isolate*, int, v8::internal::PretenureFlag) [node]
7: v8::internal::compiler::CodeGenerator::PopulateDeoptimizationData(v8::internal::Handle<v8::internal::Code>) [node]
8: v8::internal::compiler::CodeGenerator::FinalizeCode() [node]
9: v8::internal::compiler::PipelineImpl::FinalizeCode() [node]
10: v8::internal::compiler::PipelineCompilationJob::FinalizeJobImpl() [node]
11: v8::internal::Compiler::FinalizeCompilationJob(v8::internal::CompilationJob*) [node]
12: v8::internal::OptimizingCompileDispatcher::InstallOptimizedFunctions() [node]
13: v8::internal::Runtime_TryInstallOptimizedCode(int, v8::internal::Object**, v8::internal::Isolate*) [node]
14: 0x12dc8b08463d
```
</details>
wchargin-branch: load-git-repositories
# Please enter the commit message for your changes. Lines starting
# with '#' will be kept; you may remove them yourself if you want to.
# An empty message aborts the commit.
#
# Date: Mon Apr 23 23:02:14 2018 -0700
#
# HEAD detached at origin/wchargin-load-git-repositories
# Changes to be committed:
# modified: package.json
# new file: src/plugins/git/__snapshots__/loadRepository.test.js.snap
# new file: src/plugins/git/loadRepository.js
# new file: src/plugins/git/loadRepository.test.js
#
# Untracked files:
# out
# runtests.sh
# src/plugins/artifact/editor/ArtifactSetInput.js
# src/plugins/git/repository.js
# test.sh
# todo
#
github/githubPlugin.js was growing ungainly - it contained two major
pieces: all of the node and edge types, and the GitHub parser. As I
contemplated adding a third major new section of logic (an easy-to-use
api for traversing the GitHub graph, with first class support for
comments, authorship, etc), I found the prospect of adding even more
into that file quite unappealing. So, I have instead split it into three
files:
* github/pluginName.js: Exports the plugin name.
* github/types.js: Exports types of nodes, edges, and their payloads
* github/parser.js: Exports `GithubParser`
No logic has been changed whatsoever - this is purely a rename-refactor.
Test plan:
CI still passes. I manually verified that the Artifact Editor can still
load and display GitHub data.
We have urls for all the author types, so for consistency across GitHub
payloads, I am adding urls to the author paylods.
Test plan:
Check that snapshot changes consist entirely of adding urls, and that
the urls are appropraite.
Add logic to findReferences for finding GitHub username references,
e.g. "Hello, @wchargin!". The API is unchanged.
Test plan:
There are new unit tests that verify this behavior works as expected.
Currently, every type of reference has its own type signature: numeric
references are returned as numbers, url references are a complicated
object containing url parts, and so forth.
Since ultimately the references are just strings, it makes more sense to
treat references as plain strings. This allows a much simpler
implementation of reference edge creation in the GitHub plugin. It also
results in a simpler API for the parseReferences file (it only exports a
single findReferences function).
Test plan:
Verify that the updated tests encode appropriate behavior.
Summary:
This replaces the implementation of a static check from a somewhat
complicated use of higher-order types to a more simple empty-union
assertion, as suggested by jez in “Case Exhaustiveness in Flow”:
https://blog.jez.io/flow-exhaustiveness/
(I know; we’re not using Reason. One step at a time. :-) )
I adapted the implementation a bit because I prefer explicitly disabling
an ESLint warning over a no-op function call; it is not clear from the
latter that the purpose is to suppress a lint warning.
Test Plan:
In `githubPlugin.js`, add `| "ANOTHER"` to the `NodeType` type, and note
a compile-time Flow error on the appropriate line, with a very readable
error message. Note that all unit tests pass, and running the UI on
`sourcecred/sourcecred` yields correct titles for each node type present
(namely, all node types except for `ORGANIZATION` and `BOT`).
wchargin-branch: empty-union-assertion
Keeping the GitHub demo data up-to-date is important, and there isn't
good documentation for how to do that.
This commit adds a short README.md for the demo data, and adds an update
flag to fetchGithubRepoTest.sh that can be used to easily update it.
Test plan:
Modify example-repo.json (e.g. by deleting it entirely). Run
fetchGithubRepoTest.sh -u and confirm that the data was regenerated
without change. Run fetchGithubRepoTest.sh and confirm the test passes.
Note: The end cursor is sensitive to the timezone, which seems to be
cached with the GitHub token. An erroneous switch to Israel timezone
made it into master; this commit reverts back to US/Pacific.
This commit modifies our GitHub graphql query so that we request urls
for all objects (e.g. users, pull requests, pull request review
comments). Some change along these lines is necessary so that we can
correctly represent URL reference edges to e.g. issue comments. (It
might be possible to do without by reverse-enginering from the ids, but
we are resolved to treat ids as opaque).
Strictly speaking, we don't need to collect urls for users, issues, and
pull requests - they are generated via simple schema. However, for
consistency, I think it's better to just take URLs on everything.
Test plan: The example-repo.json has been regenerated. The diffs are as
expected.
Summary:
This commit completes the ad hoc pagination solution described in #117:
we implement pagination specifically for our current query against the
GitHub API. This is done in such a way that reasonable additions to the
query will not be hard to implement—for instance, if we want to fetch
a new kind of field, the marginal cost is at most a bit of extra
copy-and-paste and some modifications to tests. However, we should
certainly still plan to implement the fully automatic pagination system
described in #117.
Running on TensorBoard with the default page limits takes 30–33 seconds
over 7 queries, uses 103 GitHub API points (out of 5000 for any given
hour), and produces a JSON file that is 8.7MB (when pretty-printed).
This all seems quite reasonable to me.
Test Plan:
Extensive unit tests added. The snapshots are quite readable, by design.
For a real-world test, you can `yarn start` the artifact viewer and use
the GUI to fetch the data for tensorflow/tensorboard.
To demonstrate that the fetching process gives the same results
regardless of the page size, follow these steps:
1. In `fetchGithubRepo.js`’s `postQuery` function, insert a new
statement `console.error("Posting query...")` at the beginning. (It
is important to print to stderr instead of stdout.)
2. Run `yarn backend` and then invoke `fetchGithubRepo.js` on a repo
large enough to require pagination, like SourceCred or TensorBoard.
Pipe the result to `shasum -a 256` and note the SHA.
3. In `github/graphql.js`, change the page size constants near the top
of the file. Re-run step 2. The number of queries that are posted
will vary significantly as the page size constants vary, but the
checksum should remain the same.
4. Repeat until satisfied. (I tried three sets of values: the standard
values, the standard values but all divided by 10, and all 5s.)
wchargin-branch: ad-hoc-pagination
Summary:
Once we execute the root query, find continuations, embed the
continuations into queries, and execute the continuation query, we will
need to merge the continuations’ results back into the root results.
This commit adds a function `merge` that will be suitable for doing just
that.
Test Plan:
New unit tests added, with 100% coverage. Run `yarn test`.
wchargin-branch: merge-query-results
Summary:
Per #117, this is a first step toward at writing a pagination API that
specifically targets our current GitHub query. For design details, see
new module docs on `src/plugins/github/graphql.js`.
This commit modifies the core GitHub query and thus the
`example-repo.json` snapshot: we now request `endCursor` fields for all
pagination info, and we request the `id` of the root `repository` field.
The former is obviously necessary. The latter is necessary for the
repository to be consistent with other nodes that offer connections as
fields: we require an ID on the node containing the connection so that
we can have random access to it in a continuation selector.
Test Plan:
Unit tests added. You can also try out the generated continuation
queries for yourself: apply the patch below, run `yarn backend`, and
then run the `fetchGithubRepo.js` script on `sourcecred/sourcecred`.
This will output a nicely formatted query that you can paste directly
into GitHub’s API explorer and execute. (Note that, because this patch
is not fully polished, the query must be run against a repository that
has a continuation for every node type: more pages of issues, PRs,
comments, reviews, and review comments. This is due to an
easy-but-annoying-to-fix bug in the patch, not in the code included in
this commit.)
<details>
<summary>Patch for generating a continuations query</summary>
```diff
diff --git a/src/plugins/github/fetchGithubRepo.js b/src/plugins/github/fetchGithubRepo.js
index 789a20e..418c736 100644
--- a/src/plugins/github/fetchGithubRepo.js
+++ b/src/plugins/github/fetchGithubRepo.js
@@ -6,8 +6,13 @@
import fetch from "isomorphic-fetch";
-import {stringify, inlineLayout} from "../../graphql/queries";
-import {createQuery, createVariables} from "./graphql";
+import {stringify, inlineLayout, multilineLayout} from "../../graphql/queries";
+import {
+ continuationsFromQuery,
+ continuationQuery,
+ createQuery,
+ createVariables,
+} from "./graphql";
/**
* Scrape data from a GitHub repo using the GitHub API.
@@ -66,8 +71,13 @@ function postQuery(payload, token) {
if (x.errors) {
return Promise.reject(x);
}
- ensureNoMorePages(x);
- return Promise.resolve(x);
+ console.log(
+ stringify.body(
+ continuationQuery(Array.from(continuationsFromQuery(x.data))),
+ multilineLayout(" ")
+ )
+ );
+ throw new Error("STOPSHIP");
});
}
diff --git a/src/plugins/github/graphql.js b/src/plugins/github/graphql.js
index 9ea2592..9ead42b 100644
--- a/src/plugins/github/graphql.js
+++ b/src/plugins/github/graphql.js
@@ -39,11 +39,11 @@ import {build} from "../../graphql/queries";
*
* [1]: https://developer.github.com/v4/guides/resource-limitations/#node-limit
*/
-export const PAGE_LIMIT = 100;
-const PAGE_SIZE_ISSUES = 100;
-const PAGE_SIZE_PRS = 100;
-const PAGE_SIZE_COMMENTS = 20;
-const PAGE_SIZE_REVIEWS = 10;
+export const PAGE_LIMIT = 10;
+const PAGE_SIZE_ISSUES = 10;
+const PAGE_SIZE_PRS = 10;
+const PAGE_SIZE_COMMENTS = 3;
+const PAGE_SIZE_REVIEWS = 1;
const PAGE_SIZE_REVIEW_COMMENTS = 10;
/**
@@ -340,6 +340,36 @@ function* continuationsFromReview(
}
}
+/**
+ * Combine continuations into a query.
+ */
+export function continuationQuery(
+ continuations: $ReadOnlyArray<Continuation>
+): Body {
+ const nonces: string[] = continuations.map((_, i) => `_n${String(i)}`);
+ const nonceToIndex = {};
+ nonces.forEach((n, i) => {
+ nonceToIndex[n] = i;
+ });
+ const b = build;
+ const query = b.query(
+ "Continuations",
+ [],
+ continuations.map((continuation, i) =>
+ b.alias(
+ nonces[i],
+ b.field(
+ "node",
+ {id: b.literal(continuation.enclosingNodeId)},
+ continuation.selections.slice()
+ )
+ )
+ )
+ );
+ const body = [query, ...createFragments()];
+ return body;
+}
+
/**
* These fragments are used to construct the root query, and also to
* fetch more pages of specific entity types.
```
</details>
wchargin-branch: ad-hoc-pagination-continuations
Summary:
Any time that we pull fields off a connection object, we may need to
repeat the query for subsequent pages. Therefore, such fragments will be
shared across multiple queries, and also shared within a query if we
need to fetch—say—more issue comments on two or more distinct issues.
This is a perfect use case for fragments.
This commit refactors the GitHub query to be organized in terms of
fragments, without changing the format of the results.
(We also take this opportunity to factor the page limits into
constants.)
Test Plan:
After running `yarn backend`, the `fetchGithubRepoTest.sh` test passes.
wchargin-branch: extract-github-query-fragments
Summary:
Per #117, we want to develop an ad hoc pagination API written
specifically against the query that we use to interact with GitHub.
The pagination logic should be separate from the logic to actually fetch
the repo, but should be colocated with the query itself, so this commit
extricates the query from `fetchGithubRepo.js` into a new module.
Test Plan:
Existing tests pass, including `fetchGithubRepoTest.sh`.
wchargin-branch: extract-github-graphql
Summary:
This was created by re-crawling the GitHub repo via `fetchGithubRepo`,
and then updating Jest snapshots.
Test Plan:
Note that `fetchGithubRepoTest.sh` passes, so the data is now up to
date.
Inspect the snapshot, and note that the only changes are to change login
names from `dandelionmane` to `decentralion`. To do so automatically:
```bash
set -eu
diff_contents() {
git difftool HEAD^ HEAD --extcmd=diff --no-prompt
}
! diff_contents | grep '^<' | grep -vF '"dandelionmane"'
! diff_contents | grep '^>' | grep -vF '"decentralion"'
```
wchargin-branch: decentralion-data
Summary:
For pagination, we’ll want to query against multiple entities of the
same type. GraphQL uses aliases to facilitate this. This commit adds
support for aliases to our GraphQL query DSL.
Test Plan:
Inspect snapshot changes, and note that `yarn flow` and `yarn test`
pass.
wchargin-branch: graphql-aliases
Summary:
This component now maintains a graph of just artifacts and the edges
among them. It owns the state, and notifies its parents of changes with
a callback. We treat the graph objects as properly immutable, copying
them on each change. So far, descriptions are always the empty string.
Test Plan:
Interaction tests added. Run `yarn test`.
wchargin-branch: artifact-graph-editor
Update GitHub plugin to respect two new conventions:
- Node/Edge types are exported as UPPER_CASE_CONSTANTS
- Edge types are always verbs, which can be read as $src verb $dst
Test plan:
Flow passes. Inspect snapshot changes.
Summary:
This commit revises our implementations of node and edge types, and
specifies the semantics for artifact plugin IDs: we create IDs by
slugifying an artifact name and then resolving collisions
Test Plan:
Unit tests added. Run `yarn flow` and `yarn test`.
wchargin-branch: artifact-plugin-node-edge-semantics
Summary:
Wherein we change the semantics to allow\* dangling edges. This is
necessary for plugins that want to update nodes, such as changing a
description or other noncritical field.
\* (It was technically possible before by abusing `merge`, but now you
can just do it.)
Paired with @dandelionmane.
Test Plan:
Extensive tests added. Run `yarn flow` and `yarn test`.
wchargin-branch: allow-removing-from-graph
Summary:
Clients of `Graph` that wish to treat the graph as immutable will
benefit from a `copy` method. We should provide it on `Graph` instead of
asking clients to reimplement it because it affords us the opportunity
to get the type signature right: in particular, copying should allow
upcasting of the type parameters, even though `Graph` itself is
invariant.
Paired with @dandelionmane.
Test Plan:
Unit tests added. Run `yarn flow` and `yarn test`. To check that
downcasting is not allowed, change the types in the new static test case
in `graph.test.js` to be contravariant instead of covariant, and note
that `yarn flow` fails.
wchargin-branch: graph-copy
Summary:
We need to know the repo owner and name for purposes other than fetching
the GitHub graph: for instance, fetching the `artifacts.json` file that
describes the artifact subgraph. It makes sense that these should be
settings global to the application. This commit separates a settings
component and the original GitHub graph fetcher.
This invalidates localStorage; you can manually migrate.
Paired with @dandelionmane.
Test Plan:
Note that the data continues to be stored in localStorage and that it is
updated on each keypress. Note that the state is properly passed around:
if you change the repository name from `example-repo` to `sourcecred`,
e.g., and click “Fetch GitHub graph”, then the proper graph is fetched.
wchargin-branch: separate-artifact-settings
* Generate Edge ids automatically
Adds edgeID in graph, which creates a string id from src and dest.
Provided that the plugin only uses edgeID for generating edge ids of
that type, these ids will be unique.
Modify the GitHub plugin to use edgeID. This allows the code and
typesignature to be simpler, and will be more consistent with other
plugins.
Test plan:
Carefully inspect the snapshots.
* Add a toString and fromString method on addresses
The toString and fromString methods use json-stable-stringify,
and we've modified other address code to use these methods.
As such, a number of the snapshots have changed (ordering).
Test plan:
Verify the new included unit tests are comprehensive. Inspect the
snapshots.
This pull request adds a string type as a field of the address, thus canonicalizing that all Nodes and Edges have a Type. This allows for simpler PluginAdapters, and simpler implementation of the GitHub plugin (as it no longer needs to invent its own mechanism for storing types).
I explored making the Address interface generic, with a Type parameter that is a subtype of string. Unfortunately, Flow type resolution seems to have an exponential performance degradation with many subtyped parameters, and adding the extra type parameters to Graph.merge resulted in my flow instance locking. Maybe we can explore adding the subtypes later.
In the GitHub plugin, we entirely do away with the NodeIDs, but we still have EdgeIDs. I plan to remove the need for EdgeIDs in a separate PR which will enforce uniqueness of (srcAddress, dstAddress, pluginName, type) tuples, so that explicitly generating IDs for edges will be unnecessary. In the mean time, I bifurcated the makeAddress function in the GitHub plugin to makeEdgeAddress and makeNodeAddress.
Test plan:
Flow and unit tests all pass. Inspect snapshots, and verify that all the changes are reasonable. Note that since we order by serialized address, adding the type field to address has changed the snapshot order in a few cases.
Close#103
Summary:
This commit moves our existing frontend tests to use Enzyme’s shallow
rendering API <http://airbnb.io/enzyme/docs/api/shallow.html>. The
benefit over also using `react-test-renderer` is simply consistency (the
two are functionally equivalent); the benefits over `mount` are that
subcomponents cannot contaminate the test state (i.e., you’re only
testing one component at a time), that the resulting snapshots are more
readable because the root props are not shown, and that the
implementation is more efficient. This is a follow-up to #102.
In a case where we actually need a full DOM tree, we should still feel
free to use `mount`, but we haven’t needed that yet.
Test Plan:
Verify that the new `ContributionList.test.js.snap` represents the same
data as the old one.
wchargin-branch: standardize-enzyme-shallow
Summary:
This is our first dynamic test of a React component! Enzyme looks pretty
easy to use to me, for both snapshot tests and interaction simulation.
In doing so, we catch a minor bug in the edge case where a contribution
is not owned by any plugin (`colSpan`, not `colspan`). This edge case
does not appear in the sample data, but it does appear in the test data,
even prior to this commit. The previous renderer, `react-test-renderer`,
appears not to surface this error. Furthermore, this bug did not cause
any user-visible errors except a `console.error`.
Test Plan:
Inspect the snapshot file to make sure that it is reasonable. (The
existing test case has its snapshot regenerated due to formatting
differences between the two renderers.)
To test that the browser error is fixed, render a contribution list on a
GitHub graph but with an empty adapter set. One way to do this is to comment out line 7 of
`standardAdapterSet.js`; alternately, you can use the React Dev Tools to
select the `ContributionList` node, then run
```js
$r.props.adapters.adapters = {};
$r.forceUpdate();
```
Note subsequently that there is no console error and that the `<td>`s in
question span three columns.
wchargin-branch: contributionlist-dynamic-test
Summary:
Filter options are “all contributions” or a specific plugin/type
combination. This includes a snapshot test for the static state. I’ll
add an interaction test in a subsequent commit.
Test Plan:
`yarn start`, fetch graph, play with the filtering options.
wchargin-branch: filter-contributions
* Make GitHub capitalization consistent within code
We now never capitalize the H in GitHub within variable or function
names. We still capitalize it in comments or user facing strings.
Test plan:
Unit tests, the fetchGithubRepoTest.sh, and
`git grep itHub` only shows comment lines and print statements.
* Fix William's klaxon
This commit only adds logic for finding references in GitHub posts,
either by #-numeric reference, or explicit urls. Adding the reference
edges to the graph will occur in a followon commit.
Test plan: New unit tests are included
Summary:
Any tests that render Aphrodite-styled React elements will need to do
this, so it’s nice to have the code in one place.
wchargin-branch: aphrodite-testutils
Summary:
In addition to being nicer on the eyes, this enables the query to be
statically analyzed (e.g., by an auto-pagination API) and used by other
modules.
Test Plan:
Manually running
```shell
$ yarn backend
$ GITHUB_TOKEN="<your_token>" src/plugins/github/fetchGitHubRepoTest.sh
```
succeeds.
wchargin-branch: use-structured-graphql-queries
Summary:
This commit begins to extend the artifact editor to display
contributions. To display contributions from arbitrary plugins, we need
to communicate with those plugins somehow. We do so via an adapter
interface that plugins implement; included in this commit is an
implementation of this interface for the GitHub plugin (partially: we
punt on rendering).
This includes a snapshot test. The snapshot format is designed to be
human-readable and -auditable so that it can serve as documentation.
Test Plan:
Run the application with `yarn start`. Then, fetch a graph and watch as
its contributions appear in the view.
wchargin-branch: contributions-and-adapters
Summary:
This is useful for metaprogramming. For instance, suppose we have an
object like this:
```js
const stringifiers = {
ISSUE: (stringifyIssue: (Node<IssueNodePayload>) => string),
COMMENT: (stringifyComment: (Node<CommentPayload>) => string),
...
}
```
How do we type this? We might try
```js
{[type: NodeType]: (Node<NodePayload>) => string}
```
but this is not correct, because `Node<IssueNodePayload>` is a subtype of
`Node<NodePayload>`, and `(_) => K` is contravariant, not covariant. (In
other words, a function from `Node<IssueNodePayload>` is not as general
as a function from `Node<NodePayload>`.) We need to express a dependency
between the object key and the value. We instead write:
```js
type TypedNodeToStringifier = <T: $Values<NodeTypes>>(
T
) => (node: Node<$ElementType<T, "payload">>) => string;
(stringifiers: $Exact<$ObjMap<NodeTypes, TypedNodeToStringifier>>);
```
This expresses exactly (heh) the right type.
Test Plan:
Note that removing any of the elements of `NodeTypes` yields a Flow
error, due to the static assertion following the type definition.
wchargin-branch: node-types
I added some new issues to sourcecred/example-repo to test unicode
support and parsing of extremely long issues titles.
This commit merely updates our example-repo json and the corresponding
snapshots.
Test plan:
Run testFetchGithubRepo.sh
Run unit tests
Also, since there are now two types of things that are being
"contained" (comments and pull request reviews), I factored out an
addContainment method to avoid repeating that code.
To make our handling of PullRequestReviewComments and regular Comments
consistent, I modified our query string so that we now request urls on
PullRequestReviewComments. Also, since I didn't notice until closely
inspecting the snapshot that we had been adding payloads with some
undefined properties, I added a test to verify that every property on
every node and edge payload is defined.
I regenerated the example-repo data to reflect the change to query
string.
Test plan:
Verify that the snapshot changes are appropriate
Run standard tests
Run `yarn backend`
Run `GITHUB_TOKEN={your_token} ./src/plugins/github/fetchGithubRepoTest.sh`
Summary:
This is quick and dirty. No error handling yet. We’ll soon save
credentials and repository to local storage.
Paired with @dandelionmane.
Test Plan:
Run `yarn start`, then enter your API key and specify the
`sourcecred/example-repo` repo. Note that the resulting graph is shortly
logged to the console.
wchargin-branch: fetch-parse-github-frontend
Summary:
We’ll now start creating the artifact plugin. A large part of this will
be the user interface, including a GUI. For now, our build system just
builds a single React app, so we’re cannibalizing the main explorer to
serve this purpose.
Paired with @dandelionmane.
Test Plan:
The following still work:
- `yarn test`
- `yarn start`
- `yarn build; (cd build; python -m SimpleHTTPServer)`
wchargin-branch: repurpose-react-app-as-artifact-editor
Summary:
We’re not deleting it because it works with the build system and has the
service worker stuff from create-react-app, but we’ll soon repurpose it.
Paired with @dandelionmane.
Test Plan:
The following still work:
- `yarn test`
- `yarn start`
- `yarn build; (cd build; python -m SimpleHTTPServer)`
wchargin-branch: dismantle-explorer
The GitHub parser transforms GraphQL api data from GitHub into our Graph
data structure. This commit focuses on properly parsing Issues, Pull
Requests, Comments, and Users.
Test Plan:
Run the unit tests. Inspect the snapshot results (particuarly those for
individual pull requests or issues, which are easier to parse) and
verify that the output is appropriate.
Summary:
Running `yarn backend` will now bundle backend applications. They’ll be
placed into the new `bin/` directory. This enables us to use ES6 modules
with the standard syntax, Flow types, and all the other goodies that
we’ve come to expect. A backend build takes about 2.5s on my laptop.
Created by forking the prod configuration to a backend configuration and
trimming it down appropriately.
To test out the new changes, this commit changes `fetchGitHubRepo` and
its driver to use the ES6 module system and Flow types, both of which
are properly resolved.
Test Plan:
Run `yarn backend`. Then, you can directly run an entry point via
```
$ node bin/fetchAndPrintGitHubRepo.js sourcecred example-repo "${TOKEN}"
```
or invoke the standard test driver via
```shell
$ GITHUB_TOKEN="${TOKEN}" src/backend/fetchGitHubRepoTest.sh
```
where `${TOKEN}` is your GitHub authentication token.
wchargin-branch: webpack-backend
Summary:
See motivation in #76. Feel free to look at the new snapshot file to
inspect the structured representation and also the stringified output.
This implementation is sufficient to encode our query against the
GitHub v4 API; see the test plan below.
Test Plan:
Unit tests added; run `yarn flow && yarn test`.
This code has full coverage except for lines 260, 315, and 380 of
`queries.js`; these lines check invariants that should never be
violated.
You can also use the following steps to verify that the sample query is
valid GraphQL that produces the same results as our hand-written query:
1. Apply the following hacky patch:
```diff
diff --git a/src/backend/graphql/queries.test.js b/src/backend/graphql/queries.test.js
index 52bdec7..c04a636 100644
--- a/src/backend/graphql/queries.test.js
+++ b/src/backend/graphql/queries.test.js
@@ -3,6 +3,18 @@
import type {Body} from "./queries";
import {build, stringify, multilineLayout, inlineLayout} from "./queries";
+function emitGitHubQuery(layout, filename) {
+ const fs = require("fs");
+ const path = require("path");
+ const result = stringify.body(usefulQuery(), layout);
+ const outputFilepath = path.join(__dirname, "..", filename);
+ const outputText = `module.exports = ${JSON.stringify(result)};\n`;
+ fs.writeFileSync(outputFilepath, outputText);
+ console.log(`Wrote output to ${outputFilepath}.`);
+}
+emitGitHubQuery(multilineLayout(" "), "githubQueryMultiline.js");
+emitGitHubQuery(inlineLayout(), "githubQueryInline.js");
+
describe("queries", () => {
describe("end-to-end-test cases", () => {
const testCases = {
```
2. Run `CI=true yarn test`, and verify that the following two files
written to `src/backend/` contain appropriate contents. You can just
eyeball them, or check that they match my results:
https://gist.github.com/wchargin/f37b99fd4ec345c9d2541c2dc53ceda9
3. In `fetchGitHubRepo.js`, change the definition of `const query` to
```js
const query = require("./githubQueryMultiline.js");
```
Run
```shell
GITHUB_TOKEN="<your_token_here>" src/backend/fetchGitHubRepoTest.sh
```
and verify that it exits successfully.
4. Repeat for `require("./githubQueryInline.js")`.
wchargin-branch: graphql-structured-queries
Summary:
Closes#82. This affords clients type-safety without needing to
verbosely annotate every node or edge passed into the graph functions.
It also enables graph algorithms to be more expressive in their types:
for instance, the merge function now clearly indicates from its type
that the first graph’s nodes are passed as the first argument to the
node reducer, and the second graph’s nodes to the second. Clients can
upgrade immediately by using `Graph<*, *>`.
Thankfully, Flow supports variance well enough for this all to be
possible without too much trouble.
Test Plan:
Existing unit tests pass statically and at runtime. I added a test case
to demonstrate that merging works covariantly.
To see some failures, change `string` to an incompatible type, like
`number`, in the definitions of `makeGraph` in test functions for
conservatively rejecting graphs with conflicting nodes/edges
(ll. 446, 462).
wchargin-branch: parameterize-graph
Summary:
Flow doesn’t allow us to specify variance annotations in generic
function parameters, and doesn’t allow coercing `Node<T>` to
`Node<mixed>`. This forces us to put `any`s in our code, which…works.
Paired with @dandelionmane.
Test Plan:
New unit tests trivially pass dynamically, and now pass statically
(failing before the changes to `graph.js`).
wchargin-branch: explicitly-typed-nodes-edges
Graph.addNode and Graph.addEdge now allow adding the same node or edge
multiple times, provided that the duplicate adds are trying to insert
identical content.
This came up while prototyping the GitHub plugin; rather than create
myriad subgraphs and merge them, I found it convenient to construct a
single graph and iteratively add nodes. Since the same node may be
discovered multiple times (most notably user identities), there was a
need for a "conservative add" abstraction that adds a node if it doesn't
exist yet, but errors only if multiple adds conflict.
Since this behavior is generic and highly conservative, it seemed
appropriate to include in the graph class itself.
Test Plan:
The unit tests have been updated to include the new behavior.
I moved sourcecred/tiny-example-repository to sourcecred/example-repo
as it's simpler to remember. I also unarchived it and added comments
to an issue, so that we can create a simple test for issue parsing.
This commit merely updates SourceCred to point to example-repo with
the regenerated canoncial output.
Summary:
It’s a whole new world of GraphQL! Our parser is now just a GraphQL
query that asks for exactly what we want and dumps it to a file. The
data exposed by the v4 API is also in a much nicer format than that of
the v3 API, so this is pretty much a universal improvement.
Currently, we do not handle pagination. We require that the repository
in question have fewer than a fixed number of issues, and comments per
issue, and reviews per PR, and review comments per PR, and so on. If
this limit is exceeded, the script will fail-fast with a nice error
message. To fix this, we’ll need to write a general-purpose pagination
API that allows traversing cursors at any level of the query.
Paired with @wchargin.
Test Plan:
Run
$ GITHUB_TOKEN="your_token_here" src/backend/fetchGitHubRepoTest.sh
and verify that it exits with 0. Note that if you change this script’s
repository from `tiny-example-repository` to `sourcecred`, the script
correctly fails and outputs a useful diff.
wchargin-branch: github-v4-graphql
* Factor evertide graph demo data to a new module
It would be helpful to make our standard tiny graph available to other
test and demo instances, outside of just graph.test.js. This way we can
use it as a test case for the Graph Explorer.
* Make App.js into skeleton for GraphExplorer
We make a very basic skeleton for the Graph Explorer as a basis
for future development.
This commit also removes the UserExplorer and FileExplorer from
App.js. Since we have changed the underlying data model, we are
unlikely to use the UserExplorer or FileExplorer in anything like
their current state, so they are effectively deprecated. I am deferring
removing them because it is nice to have some examples of working React
code to copy from, before the Graph Explorer is ready.
Test plan: run `yarn start`, and observe that the App displays the
words "Graph Explorer" underneath the "SourceCred Explorer" title bar.
Summary:
This commit adds `toJSON()` and `static fromJSON()` on `Graph`. The main
benefit at this time is that this gets us free interoperability with
Jest’s snapshot testing.
The implementation of `fromJSON` is not performance-tuned, and could
probably be significantly optimized.
See #65 for discussion.
Test Plan:
New unit tests added: `yarn flow && yarn test`.
wchargin-branch: make-graph-serializable
Summary:
This commit simplifies the implementation of `Graph` without changing
its interface. We now use the `AddressMap` for all four instance fields
of `Graph`.
Test Plan:
All existing tests pass, and coverage is maintained.
wchargin-branch: use-address-map-in-graph
Summary:
This commit reifies the concept of an `Addressable`, which is any object
that has a covariant `address: Address` attribute, and implements a
simple data structure for storing addressable items keyed against their
addresses. Instances of `AddressMap` can replace the four fields of
`Graph`:
```js
_nodes: AddressMap<Node<mixed>>;
_edges: AddressMap<Edge<mixed>>;
_outEdges: AddressMap<{|+address: Address, +edges: Address[]|}>;
_inEdges: AddressMap<{|+address: Address, +edges: Address[]|}>;
```
Test Plan:
New unit tests included, with 100% coverage: `yarn flow && yarn test`.
wchargin-branch: address-map
Summary:
We’re stripping down the payload types for the GitHub plugin, to only
include what we expect to use immediately. In doing so, we take the
opportunity to make the typing a little stronger, so that we can ensure
that the `type` field of a specific type of payload is set to a
particular constant.
Paired with @dandelionmane.
Test Plan:
Adding these lines to `githubPlugin.js` and running `yarn flow`
indicates that the typechecking is working as expected:
```js
("ISSUE" : NodeType); // works
("WEIRD" : NodeType); // fails
("AUTHORSHIP" : EdgeType); // works
("UNEXPECTED" : EdgeType); // fails
```
wchargin-branch: github-plugin-payload-types
Summary:
`graph.js` coverage is now 100% :-)
Test Plan:
`yarn jest --env=jsdom --coverage` shows no uncovered lines for
`graph.js`, and no failing tests.
wchargin-branch: coverage-gremlin
Summary:
Merging graphs will be a common operation. At a per-plugin level, it
will often be useful to build up graphs by creating many very small
graphs and then merging them together. At a cross-project level, we will
need to merge graphs across repositories to gain an understanding of how
value flows among these repositories. It’s important that the core graph
type provide useful functions for merging; this commit adds them.
Test Plan:
New unit tests added; run `yarn flow && yarn test`.
wchargin-branch: graph-merge
Summary:
We need this for testing graph equality: deep-equality is not sufficient
because two graphs can be logically equal even if, say, two nodes are
added in different orders.
This commit adds a dependency on `lodash.isequal` for deep equality.
Test Plan:
New unit tests added. Run `yarn flow && yarn test`.
wchargin-branch: graph-equals
Summary:
In merging #54, there was a semantic merge conflict that was not also a
textual merge conflict; this created a failure that only appeared once
that commit was merged.
We propose that to fix this in the future, we only merge commits that
are directly ahead of master.
Test Plan:
This fixes `yarn flow` and `yarn test`.
wchargin-branch: fix-merge-conflict
Summary:
Again: we assume these invariants, so we may as well encode them.
We should just keep in mind that non-Flow users may wantonly violate
these, so we should still code defensively.
wchargin-branch: readonly-exact
Summary:
These will make nicer error functions in cases where static analysis
doesn’t detect the pollution: e.g., a user isn’t using Flow, or an
expression like `arr[0]` introduces an `undefined`.
Paired with @dandelionmane.
Test Plan:
New unit tests added. Run `yarn test`.
wchargin-branch: null-undefined-check
Create an 'advancedMealGraph' test case
The advancedMealGraph will be a grab-all that holds all advanced and
edge behaviors, e.g. the crab-self-referential loop, and the case
where there are multiple directed edges between the same two nodes.
Aggregating them into one test case will make it easier to test more
complex behaviors, like graph merging and serialization, on the
edge case graphs. However, it's still nice to have the simple graph
so that we can test simple things too. The specific tests for edge
case behavior are left mostly unchanged, in that they start from the
simple graph and add just the advanced feature that they want to test.
Summary:
Without these functions, it is not possible to meaningfully operate on
an arbitrary graph.
Paired with @dandelionmane.
Test Plan:
New unit tests included. Run `yarn flow && yarn test`.
wchargin-branch: get-all
Summary:
We’ve realized that `u: Edge<T>` implies `u: Node<T>`. That certainly
wasn’t what we were expecting! We might want something like that
eventually, to capture the fact that valuations are themselves valuable,
but for now the type system should encode the assumptions that we’re
actually making. See also #50.
Paired with @dandelionmane.
wchargin-branch: exact-types
Summary:
We had planned to expose our core types as simple Plain Old JavaScript
Objects, with accompanying standalone functions to act directly on these
data structures. We chose this instead of creating `class`es for the
types because it simplifies serialization interop: it obviates the need
for serialization and deserialization functions, because the code is
separated from the data entirely. Reconsidering, we now think that the
convenience benefits of using classes probably outweigh these
serialization cons. Furthermore, this design enables us to separate
ancillary data structures and caches from the raw data, presenting a
cleaner API for consumers of the data.
This commit introduces a `Graph` class and some related logic. With lots
of tests! And 100% code coverage! :-)
Paired with @dandelionmane.
Test Plan:
Run `yarn flow && yarn test` to see the new tests.
wchargin-branch: graph-class
Summary:
The main problem with having these fields on the node is that this
presents the illusion that the API surface area is larger than it
actually is. Clients with reference to a node object could
somewhat-reasonably expect that mutating these fields would be
sufficient to update the structure of the graph, but this isn’t the case
(as the edge objects would need to be updated, too). It’s a nice
semantic bonus, too, as edges aren’t conceptually “part of” nodes.
wchargin-branch: top-level-edges
Summary:
This is an experiment. There are a couple diffferent meanings of
“weight” in play: most prominently, weights assigned by plugins versus
those suitable for comparison among other arbitrary weights. We’re not
sure what the right thing is to put in the actual graph object, so we’re
going to think about this a bit more before adding the field back in.
wchargin-branch: remove-weights
Summary:
The “ID” parts were left-over from the Great Address Migration, and we
think that abbreviations are fine here, anyway.
Test Plan:
`yarn flow && yarn test`
wchargin-branch: src-dst-rename
Summary:
The sourcecred/tiny-example-repository repository stores some example
data that we can use to generate test cases. As of now, the repository
has been archived so that its state is stable. This commit checks in the
result of our scraper on the repository.
wchargin-branch: example-data
Reorganize the code so that we have a single package.json file, which is at the root.
All source code now lives under `src`, separated into `src/backend` and `src/explorer`.
Test plan:
- run `yarn start` - it works
- run `yarn test` - it finds the tests (all in src/explorer) and they pass
- run `yarn flow` - it works. (tested with an error, that works too)
- run `yarn prettify` - it finds all the js files and writes to them
Dandelion Mané
William Chargin
