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Allow replacing old value in MarketOracle even if last push was less than reportDelaySec ago #72

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Allow replacing old value in MarketOracle even if last push was less than reportDelaySec ago #72

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df5d63d
Allow for replacing old values
ahnaguib Jul 16, 2020
f61b12c
Allow for replacing old values
ahnaguib Sep 14, 2020
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8 changes: 7 additions & 1 deletion contracts/MedianOracle.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -120,13 +120,18 @@ contract MedianOracle is Ownable, IOracle {
Report[2] storage reports = providerReports[providerAddress];
uint256[2] memory timestamps = [reports[0].timestamp, reports[1].timestamp];

// Checks that this providerAddress is already whitelisted
require(timestamps[0] > 0);

uint8 index_recent = timestamps[0] >= timestamps[1] ? 0 : 1;
uint8 index_past = 1 - index_recent;

uint256 minValidTimestamp = now.sub(reportExpirationTimeSec);
uint256 maxValidTimestamp = now.sub(reportDelaySec);

// Check that the push is not too soon after the last one.
require(timestamps[index_recent].add(reportDelaySec) <= now);
require(timestamps[index_past] < minValidTimestamp ||
timestamps[index_recent] <= maxValidTimestamp);

reports[index_past].timestamp = now;
reports[index_past].payload = payload;
Expand All @@ -140,6 +145,7 @@ contract MedianOracle is Ownable, IOracle {
function purgeReports() external
{
address providerAddress = msg.sender;
// Check that this providerAddress is already whitelisted
require (providerReports[providerAddress][0].timestamp > 0);
providerReports[providerAddress][0].timestamp=1;
providerReports[providerAddress][1].timestamp=1;
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3 changes: 2 additions & 1 deletion test/unit/median_oracle.js
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Expand Up @@ -77,7 +77,8 @@ contract('MedianOracle:pushReport', async function (accounts) {
expect(await chain.isEthException(oracle.pushReport(1000000000000000000, { from: A }))).to.be.true;
oracle.addProvider(A, { from: deployer });
r = await oracle.pushReport(1000000000000000000, { from: A });
// should fail if reportDelaySec did not pass since the previous push
r = await oracle.pushReport(1000000000000000000, { from: A });
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can we create a separate test for this case?

I think the original test is should only push from authorized source

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@aalavandhan aalavandhan Sep 11, 2020 •
edited
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Will be great if we can test all the cases:

Reported rates (ordered by time) are r1, r2. The new rate is r.

  1. r2 < minValidTimestamp
  2. r1 < minValidTimestamp < r2 < maxValidTimestamp
  3. minValidTimestamp < r1 < r2 < maxValidTimestamp
  4. r1 < minValidTimestamp < maxValidTimestamp < r2
  5. minValidTimestamp < r1 < maxValidTimestamp < r2
  6. maxValidTimestamp < r1

Am I missing something?

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will make sure at least coverage is back to 100%

// should fail if push is too early
expect(await chain.isEthException(oracle.pushReport(1000000000000000000, { from: A }))).to.be.true;
});
it('should emit ProviderReportPushed message', async function () {
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