Proof period and proof timeout are network constants now

contracts/Marketplace.sol

@@ -98,8 +98,6 @@ contract Marketplace is Collateral {
     uint256 duration;
     uint256 size;
     bytes32 contentHash;
-    uint256 proofPeriod;
-    uint256 proofTimeout;
     uint256 maxPrice;
     uint256 expiry;
     bytes32 nonce;

contracts/Proofs.sol

@@ -2,9 +2,15 @@
 pragma solidity ^0.8.0;
 
 contract Proofs {
+  uint256 private immutable period;
+  uint256 private immutable timeout;
+
+  constructor(uint256 __period, uint256 __timeout) {
+    period = __period;
+    timeout = __timeout;
+  }
+
   mapping(bytes32 => bool) private ids;
-  mapping(bytes32 => uint256) private periods;
-  mapping(bytes32 => uint256) private timeouts;
   mapping(bytes32 => uint256) private starts;
   mapping(bytes32 => uint256) private ends;
   mapping(bytes32 => uint256) private markers;
@@ -12,12 +18,12 @@ contract Proofs {
   mapping(bytes32 => mapping(uint256 => bool)) private received;
   mapping(bytes32 => mapping(uint256 => bool)) private missing;
 
-  function _period(bytes32 id) internal view returns (uint256) {
-    return periods[id];
+  function _period() internal view returns (uint256) {
+    return period;
   }
 
-  function _timeout(bytes32 id) internal view returns (uint256) {
-    return timeouts[id];
+  function _timeout() internal view returns (uint256) {
+    return timeout;
   }
 
   function _end(bytes32 id) internal view returns (uint256) {
@@ -28,24 +34,9 @@ contract Proofs {
     return missed[id];
   }
 
-  // Checks that proof timeout is <= 128. Only the latest 256 blocks can be
-  // checked in a smart contract, so that leaves a period of at least 128 blocks
-  // after timeout for a validator to signal the absence of a proof.
-  function _checkTimeout(uint256 timeout) private pure {
-    require(timeout <= 128, "Invalid proof timeout > 128");
-  }
-
-  function _expectProofs(
-    bytes32 id,
-    uint256 period,
-    uint256 timeout,
-    uint256 duration
-  ) internal {
+  function _expectProofs(bytes32 id, uint256 duration) internal {
     require(!ids[id], "Proof id already in use");
-    _checkTimeout(timeout);
     ids[id] = true;
-    periods[id] = period;
-    timeouts[id] = timeout;
     starts[id] = block.number;
     ends[id] = block.number + duration + 2 * timeout;
     markers[id] = uint256(blockhash(block.number - 1)) % period;
@@ -64,15 +55,11 @@ contract Proofs {
       return false;
     }
     bytes32 hash = blockhash(blocknumber - 1);
-    return hash != 0 && uint256(hash) % periods[id] == markers[id];
+    return hash != 0 && uint256(hash) % period == markers[id];
   }
 
-  function _isProofTimedOut(bytes32 id, uint256 blocknumber)
-    internal
-    view
-    returns (bool)
-  {
-    return block.number >= blocknumber + timeouts[id];
+  function _isProofTimedOut(uint256 blocknumber) internal view returns (bool) {
+    return block.number >= blocknumber + timeout;
   }
 
   function _submitProof(
@@ -85,16 +72,13 @@ contract Proofs {
       _isProofRequired(id, blocknumber),
       "No proof required for this block"
     );
-    require(
-      !_isProofTimedOut(id, blocknumber),
-      "Proof not allowed after timeout"
-    );
+    require(!_isProofTimedOut(blocknumber), "Proof not allowed after timeout");
     require(!received[id][blocknumber], "Proof already submitted");
     received[id][blocknumber] = true;
   }
 
   function _markProofAsMissing(bytes32 id, uint256 blocknumber) internal {
-    require(_isProofTimedOut(id, blocknumber), "Proof has not timed out yet");
+    require(_isProofTimedOut(blocknumber), "Proof has not timed out yet");
     require(!received[id][blocknumber], "Proof was submitted, not missing");
     require(_isProofRequired(id, blocknumber), "Proof was not required");
     require(!missing[id][blocknumber], "Proof already marked as missing");

contracts/Storage.sol

@@ -14,10 +14,12 @@ contract Storage is Collateral, Marketplace, Proofs {
 
   constructor(
     IERC20 token,
+    uint256 _proofPeriod,
+    uint256 _proofTimeout,
     uint256 _collateralAmount,
     uint256 _slashMisses,
     uint256 _slashPercentage
-  ) Marketplace(token, _collateralAmount) {
+  ) Marketplace(token, _collateralAmount) Proofs(_proofPeriod, _proofTimeout) {
     collateralAmount = _collateralAmount;
     slashMisses = _slashMisses;
     slashPercentage = _slashPercentage;
@@ -27,12 +29,7 @@ contract Storage is Collateral, Marketplace, Proofs {
     Offer storage offer = _offer(id);
     require(msg.sender == offer.host, "Only host can call this function");
     Request storage request = _request(offer.requestId);
-    _expectProofs(
-      id,
-      request.proofPeriod,
-      request.proofTimeout,
-      request.duration
-    );
+    _expectProofs(id, request.duration);
   }
 
   function finishContract(bytes32 id) public {
@@ -43,6 +40,14 @@ contract Storage is Collateral, Marketplace, Proofs {
     require(token.transfer(offer.host, offer.price), "Payment failed");
   }
 
+  function proofPeriod() public view returns (uint256) {
+    return _period();
+  }
+
+  function proofTimeout() public view returns (uint256) {
+    return _timeout();
+  }
+
   function proofEnd(bytes32 contractId) public view returns (uint256) {
     return _end(contractId);
   }
@@ -59,12 +64,8 @@ contract Storage is Collateral, Marketplace, Proofs {
     return _isProofRequired(contractId, blocknumber);
   }
 
-  function isProofTimedOut(bytes32 contractId, uint256 blocknumber)
-    public
-    view
-    returns (bool)
-  {
-    return _isProofTimedOut(contractId, blocknumber);
+  function isProofTimedOut(uint256 blocknumber) public view returns (bool) {
+    return _isProofTimedOut(blocknumber);
   }
 
   function submitProof(

contracts/TestProofs.sol

@@ -5,12 +5,19 @@ import "./Proofs.sol";
 
 // exposes internal functions of Proofs for testing
 contract TestProofs is Proofs {
-  function period(bytes32 id) public view returns (uint256) {
-    return _period(id);
+  constructor(uint256 __period, uint256 __timeout)
+    Proofs(__period, __timeout)
+  // solhint-disable-next-line no-empty-blocks
+  {
+
   }
 
-  function timeout(bytes32 id) public view returns (uint256) {
-    return _timeout(id);
+  function period() public view returns (uint256) {
+    return _period();
+  }
+
+  function timeout() public view returns (uint256) {
+    return _timeout();
   }
 
   function end(bytes32 id) public view returns (uint256) {
@@ -21,13 +28,8 @@ contract TestProofs is Proofs {
     return _missed(id);
   }
 
-  function expectProofs(
-    bytes32 id,
-    uint256 _period,
-    uint256 _timeout,
-    uint256 _duration
-  ) public {
-    _expectProofs(id, _period, _timeout, _duration);
+  function expectProofs(bytes32 id, uint256 _duration) public {
+    _expectProofs(id, _duration);
   }
 
   function isProofRequired(bytes32 id, uint256 blocknumber)

deploy/storage.js

@@ -1,9 +1,18 @@
 module.exports = async ({ deployments, getNamedAccounts }) => {
   const token = await deployments.get("TestToken")
+  const proofPeriod = 10
+  const proofTimeout = 5
   const collateralAmount = 100
   const slashMisses = 3
   const slashPercentage = 10
-  const args = [token.address, collateralAmount, slashMisses, slashPercentage]
+  const args = [
+    token.address,
+    proofPeriod,
+    proofTimeout,
+    collateralAmount,
+    slashMisses,
+    slashPercentage,
+  ]
   const { deployer } = await getNamedAccounts()
   await deployments.deploy("Storage", { args, from: deployer })
 }

test/Proofs.test.js

@@ -12,40 +12,27 @@ describe("Proofs", function () {
 
   beforeEach(async function () {
     const Proofs = await ethers.getContractFactory("TestProofs")
-    proofs = await Proofs.deploy()
+    proofs = await Proofs.deploy(period, timeout)
   })
 
-  it("indicates that proofs are required", async function () {
-    await proofs.expectProofs(id, period, timeout, duration)
-    expect(await proofs.period(id)).to.equal(period)
-    expect(await proofs.timeout(id)).to.equal(timeout)
-  })
-
-  it("calculates an endtime based on duration and timeout", async function () {
-    await proofs.expectProofs(id, period, timeout, duration)
+  it("calculates an end time based on duration and timeout", async function () {
+    await proofs.expectProofs(id, duration)
     let start = await minedBlockNumber()
     let end = start + duration + 2 * timeout
     expect(await proofs.end(id)).to.equal(end)
   })
 
   it("does not allow ids to be reused", async function () {
-    await proofs.expectProofs(id, period, timeout, duration)
-    await expect(
-      proofs.expectProofs(id, period, timeout, duration)
-    ).to.be.revertedWith("Proof id already in use")
-  })
-
-  it("does not allow a proof timeout that is too large", async function () {
-    let invalidTimeout = 129 // max proof timeout is 128 blocks
-    await expect(
-      proofs.expectProofs(id, period, invalidTimeout, duration)
-    ).to.be.revertedWith("Invalid proof timeout")
+    await proofs.expectProofs(id, duration)
+    await expect(proofs.expectProofs(id, duration)).to.be.revertedWith(
+      "Proof id already in use"
+    )
   })
 
   it("requires on average a proof every period", async function () {
     let blocks = 600
     let amount = 0
-    await proofs.expectProofs(id, period, timeout, blocks)
+    await proofs.expectProofs(id, blocks)
     for (let i = 0; i < blocks; i++) {
       await mineBlock()
       if (await proofs.isProofRequired(id, await minedBlockNumber())) {
@@ -60,7 +47,7 @@ describe("Proofs", function () {
     for (let i = 0; i < 4 * period; i++) {
       mineBlock()
     }
-    await proofs.expectProofs(id, period, timeout, duration)
+    await proofs.expectProofs(id, duration)
     let start = await minedBlockNumber()
     for (let i = 1; i < 4 * period; i++) {
       expect(await proofs.isProofRequired(id, start - i)).to.be.false
@@ -69,7 +56,7 @@ describe("Proofs", function () {
 
   describe("when proofs are required", async function () {
     beforeEach(async function () {
-      await proofs.expectProofs(id, period, timeout, duration)
+      await proofs.expectProofs(id, duration)
     })
 
     async function mineUntilProofIsRequired(id) {

test/Storage.test.js

@@ -123,7 +123,8 @@ describe("Storage", function () {
         mineBlock()
       }
       const blocknumber = await minedBlockNumber()
-      for (let i = 0; i < request.proofTimeout; i++) {
+      const timeout = await storage.proofTimeout()
+      for (let i = 0; i < timeout; i++) {
         mineBlock()
       }
       await storage.markProofAsMissing(id, blocknumber)

test/examples.js

@@ -7,8 +7,6 @@ const exampleRequest = () => ({
   duration: 150, // 150 blocks ≈ half an hour
   size: 1 * 1024 * 1024 * 1024, // 1 Gigabyte
   contentHash: sha256("0xdeadbeef"),
-  proofPeriod: 8, // 8 blocks ≈ 2 minutes
-  proofTimeout: 4, // 4 blocks ≈ 1 minute
   maxPrice: 84,
   expiry: now() + hours(1),
   nonce: hexlify(randomBytes(32)),

test/ids.js

@@ -11,8 +11,6 @@ function requestId(request) {
         "bytes32",
         "uint256",
         "uint256",
-        "uint256",
-        "uint256",
         "bytes32",
       ],
       requestToArray(request)
@@ -35,8 +33,6 @@ function requestToArray(request) {
     request.duration,
     request.size,
     request.contentHash,
-    request.proofPeriod,
-    request.proofTimeout,
     request.maxPrice,
     request.expiry,
     request.nonce,