300 lines
11 KiB
JavaScript
300 lines
11 KiB
JavaScript
const { expect } = require("chai")
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const { ethers, deployments } = require("hardhat")
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const { hexlify, randomBytes } = ethers.utils
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const {
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snapshot,
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revert,
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mine,
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ensureMinimumBlockHeight,
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currentTime,
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advanceTimeForNextBlock,
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advanceTimeToForNextBlock,
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} = require("./evm")
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const { periodic } = require("./time")
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const { loadProof, loadPublicInput } = require("../verifier/verifier")
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const { SlotState } = require("./requests")
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const binomialTest = require("@stdlib/stats-binomial-test")
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const { exampleProof } = require("./examples")
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describe("Proofs", function () {
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const slotId = hexlify(randomBytes(32))
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const period = 30 * 60
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const timeout = 5
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const downtime = 64
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const probability = 4 // require a proof roughly once every 4 periods
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const { periodOf, periodEnd } = periodic(period)
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let proofs
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beforeEach(async function () {
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await snapshot()
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await ensureMinimumBlockHeight(256)
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const Proofs = await ethers.getContractFactory("TestProofs")
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await deployments.fixture(["Verifier"])
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const verifier = await deployments.get("Groth16Verifier")
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proofs = await Proofs.deploy(
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{ period, timeout, downtime, zkeyHash: "" },
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verifier.address
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)
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})
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afterEach(async function () {
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await revert()
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})
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describe("general", function () {
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beforeEach(async function () {
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await proofs.setSlotState(slotId, SlotState.Filled)
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})
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it("requires proofs with an agreed upon probability", async function () {
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const samples = 256 // 256 samples avoids bias due to pointer downtime
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await proofs.startRequiringProofs(slotId, probability)
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await advanceTimeForNextBlock(period)
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await mine()
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let amount = 0
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for (let i = 0; i < samples; i++) {
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if (await proofs.isProofRequired(slotId)) {
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amount += 1
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}
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await advanceTimeForNextBlock(period)
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await mine()
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}
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const p = 1 / probability // expected probability
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const alpha = 1 / 1000 // unit test can fail once every 1000 runs
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// use binomial test to check that the measured amount is likely to occur
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expect(binomialTest(amount, samples, { p, alpha }).rejected).to.be.false
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})
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it("supports probability 1 (proofs are always required)", async function () {
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await proofs.startRequiringProofs(slotId, 1)
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await advanceTimeForNextBlock(period)
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await mine()
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while ((await proofs.getPointer(slotId)) < downtime) {
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await mine()
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}
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expect(await proofs.isProofRequired(slotId)).to.be.true
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})
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it("requires no proofs in the start period", async function () {
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const startPeriod = Math.floor((await currentTime()) / period)
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const probability = 1
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await proofs.startRequiringProofs(slotId, probability)
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while (Math.floor((await currentTime()) / period) == startPeriod) {
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expect(await proofs.isProofRequired(slotId)).to.be.false
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await advanceTimeForNextBlock(Math.floor(period / 10))
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await mine()
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}
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})
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it("requires proofs for different ids at different times", async function () {
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let id1 = hexlify(randomBytes(32))
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let id2 = hexlify(randomBytes(32))
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let id3 = hexlify(randomBytes(32))
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for (let slotId of [id1, id2, id3]) {
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await proofs.setSlotState(slotId, SlotState.Filled)
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await proofs.startRequiringProofs(slotId, probability)
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}
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let req1, req2, req3
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while (req1 === req2 && req2 === req3) {
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req1 = await proofs.isProofRequired(id1)
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req2 = await proofs.isProofRequired(id2)
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req3 = await proofs.isProofRequired(id3)
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await advanceTimeForNextBlock(period)
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await mine()
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}
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})
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it("moves pointer one block at a time", async function () {
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await advanceTimeToForNextBlock(periodEnd(periodOf(await currentTime())))
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await mine()
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for (let i = 0; i < 256; i++) {
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let previous = await proofs.getPointer(slotId)
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await mine()
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let current = await proofs.getPointer(slotId)
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expect(current).to.equal((previous + 1) % 256)
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}
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})
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})
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describe("when proof requirement is upcoming", function () {
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async function waitUntilProofWillBeRequired() {
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while (!(await proofs.willProofBeRequired(slotId))) {
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await mine()
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}
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}
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beforeEach(async function () {
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await proofs.setSlotState(slotId, SlotState.Filled)
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await proofs.startRequiringProofs(slotId, probability)
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await advanceTimeToForNextBlock(periodEnd(periodOf(await currentTime())))
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await waitUntilProofWillBeRequired()
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})
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it("means the pointer is in downtime", async function () {
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expect(await proofs.getPointer(slotId)).to.be.lt(downtime)
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while ((await proofs.getPointer(slotId)) < downtime) {
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expect(await proofs.willProofBeRequired(slotId)).to.be.true
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await mine()
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}
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})
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it("means that a proof is required after downtime", async function () {
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while ((await proofs.getPointer(slotId)) < downtime) {
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await mine()
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}
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expect(await proofs.willProofBeRequired(slotId)).to.be.false
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expect(await proofs.isProofRequired(slotId)).to.be.true
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})
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it("will not require proofs when slot is finished", async function () {
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expect(await proofs.getPointer(slotId)).to.be.lt(downtime)
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expect(await proofs.willProofBeRequired(slotId)).to.be.true
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await proofs.setSlotState(slotId, SlotState.Finished)
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expect(await proofs.willProofBeRequired(slotId)).to.be.false
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})
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})
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describe("when proofs are required", function () {
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const proof = loadProof("hardhat")
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const pubSignals = loadPublicInput("hardhat")
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beforeEach(async function () {
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await proofs.setSlotState(slotId, SlotState.Filled)
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await proofs.startRequiringProofs(slotId, probability)
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})
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async function waitUntilProofIsRequired(slotId) {
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await advanceTimeToForNextBlock(periodEnd(periodOf(await currentTime())))
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await mine()
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while (
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!(
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(await proofs.isProofRequired(slotId)) &&
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(await proofs.getPointer(slotId)) < 250
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)
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) {
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await advanceTimeForNextBlock(period)
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await mine()
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}
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}
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it("provides different challenges per period", async function () {
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await waitUntilProofIsRequired(slotId)
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const challenge1 = await proofs.getChallenge(slotId)
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await waitUntilProofIsRequired(slotId)
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const challenge2 = await proofs.getChallenge(slotId)
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expect(challenge2).not.to.equal(challenge1)
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})
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it("provides different challenges per slotId", async function () {
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const id2 = hexlify(randomBytes(32))
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const id3 = hexlify(randomBytes(32))
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const challenge1 = await proofs.getChallenge(slotId)
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const challenge2 = await proofs.getChallenge(id2)
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const challenge3 = await proofs.getChallenge(id3)
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expect(challenge1 === challenge2 && challenge2 === challenge3).to.be.false
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})
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it("handles a correct proof", async function () {
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await proofs.proofReceived(slotId, proof, pubSignals)
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})
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it("fails proof submission when proof is incorrect", async function () {
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let invalid = exampleProof()
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await expect(proofs.proofReceived(slotId, invalid, pubSignals)).to.be
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.reverted
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})
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it("fails proof submission when public input is incorrect", async function () {
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let invalid = [1, 2, 3]
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await expect(proofs.proofReceived(slotId, proof, invalid)).to.be.reverted
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})
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it("emits an event when proof was submitted", async function () {
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await expect(proofs.proofReceived(slotId, proof, pubSignals))
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.to.emit(proofs, "ProofSubmitted")
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.withArgs(slotId)
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})
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it("fails proof submission when already submitted", async function () {
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await advanceTimeToForNextBlock(periodEnd(periodOf(await currentTime())))
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await proofs.proofReceived(slotId, proof, pubSignals)
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await expect(
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proofs.proofReceived(slotId, proof, pubSignals)
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).to.be.revertedWith("Proof already submitted")
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})
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it("marks a proof as missing", async function () {
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expect(await proofs.missingProofs(slotId)).to.equal(0)
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await waitUntilProofIsRequired(slotId)
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let missedPeriod = periodOf(await currentTime())
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await advanceTimeToForNextBlock(periodEnd(missedPeriod))
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await mine()
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await proofs.markProofAsMissing(slotId, missedPeriod)
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expect(await proofs.missingProofs(slotId)).to.equal(1)
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})
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it("does not mark a proof as missing before period end", async function () {
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await waitUntilProofIsRequired(slotId)
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let currentPeriod = periodOf(await currentTime())
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await expect(
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proofs.markProofAsMissing(slotId, currentPeriod)
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).to.be.revertedWith("Period has not ended yet")
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})
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it("does not mark a proof as missing after timeout", async function () {
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await waitUntilProofIsRequired(slotId)
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let currentPeriod = periodOf(await currentTime())
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await advanceTimeToForNextBlock(periodEnd(currentPeriod) + timeout)
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await expect(
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proofs.markProofAsMissing(slotId, currentPeriod)
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).to.be.revertedWith("Validation timed out")
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})
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it("does not mark a received proof as missing", async function () {
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await waitUntilProofIsRequired(slotId)
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let receivedPeriod = periodOf(await currentTime())
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await proofs.proofReceived(slotId, proof, pubSignals)
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await advanceTimeToForNextBlock(periodEnd(receivedPeriod))
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await mine()
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await expect(
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proofs.markProofAsMissing(slotId, receivedPeriod)
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).to.be.revertedWith("Proof was submitted, not missing")
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})
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it("does not mark proof as missing when not required", async function () {
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while (await proofs.isProofRequired(slotId)) {
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await advanceTimeForNextBlock(period)
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await mine()
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}
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let currentPeriod = periodOf(await currentTime())
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await advanceTimeToForNextBlock(periodEnd(currentPeriod))
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await mine()
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await expect(
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proofs.markProofAsMissing(slotId, currentPeriod)
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).to.be.revertedWith("Proof was not required")
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})
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it("does not mark proof as missing twice", async function () {
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await waitUntilProofIsRequired(slotId)
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let missedPeriod = periodOf(await currentTime())
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await advanceTimeToForNextBlock(periodEnd(missedPeriod))
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await mine()
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await proofs.markProofAsMissing(slotId, missedPeriod)
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await expect(
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proofs.markProofAsMissing(slotId, missedPeriod)
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).to.be.revertedWith("Proof already marked as missing")
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})
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it("requires no proofs when slot is finished", async function () {
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await waitUntilProofIsRequired(slotId)
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await proofs.setSlotState(slotId, SlotState.Finished)
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expect(await proofs.isProofRequired(slotId)).to.be.false
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})
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})
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})
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