private static CacheMissAnalysisResult AnalyzeFingerprints(
Func <PipRecordingSession> oldSessionFunc,
Func <PipRecordingSession> newSessionFunc,
TextWriter writer)
{
var result = CacheMissAnalysisResult.Invalid;
// While a PipRecordingSession is in scope, any pip information retrieved from the fingerprint store is
// automatically written out to per-pip files.
using (var oldPipSession = oldSessionFunc())
using (var newPipSession = newSessionFunc())
{
bool missingPipEntry = false;
if (!oldPipSession.EntryExists)
{
WriteLine("No fingerprint computation data found from old build.", writer, oldPipSession.PipWriter);
WriteLine("This may be the first execution where pip outputs were stored to the cache.", writer, oldPipSession.PipWriter);
// Write to just the old pip file
WriteLine(RepeatedStrings.DisallowedFileAccessesOrPipFailuresPreventCaching, oldPipSession.PipWriter);
missingPipEntry = true;
result = CacheMissAnalysisResult.MissingFromOldBuild;
WriteLine(string.Empty, writer, oldPipSession.PipWriter);
}
if (!newPipSession.EntryExists)
{
// Cases:
// 1. ScheduleProcessNotStoredToCacheDueToFileMonitoringViolations
// 2. ScheduleProcessNotStoredDueToMissingOutputs
// 3. ScheduleProcessNotStoredToWarningsUnderWarnAsError
// 4. ScheduleProcessNotStoredToCacheDueToInherentUncacheability
WriteLine("No fingerprint computation data found from new build.", writer, newPipSession.PipWriter);
// Write to just the new pip file
WriteLine(RepeatedStrings.DisallowedFileAccessesOrPipFailuresPreventCaching, newPipSession.PipWriter);
missingPipEntry = true;
result = CacheMissAnalysisResult.MissingFromNewBuild;
WriteLine(string.Empty, writer, newPipSession.PipWriter);
}
if (missingPipEntry)
{
// Only write once to the analysis file
WriteLine(RepeatedStrings.DisallowedFileAccessesOrPipFailuresPreventCaching, writer);
// Nothing to compare if an entry is missing
return(result);
}
if (oldPipSession.FormattedSemiStableHash != newPipSession.FormattedSemiStableHash)
{
WriteLine(RepeatedStrings.FormattedSemiStableHashChanged, writer);
// Make a trivial change list so the print looks like the rest of the diff
var changeList = new ChangeList <string>(new string[] { oldPipSession.FormattedSemiStableHash }, new string[] { newPipSession.FormattedSemiStableHash });
WriteLine(changeList.ToString(), writer);
}
// Diff based off the actual fingerprints instead of the PipCacheMissType
// to avoid shared cache diff confusion.
//
// In the following shared cache scenario:
// Local cache: WeakFingerprint miss
// Remote cache: WeakFingerprint hit, StrongFingerprint miss
//
// The pip cache miss type will be a strong fingerprint miss,
// but the data in the fingerprint store will not match the
// remote cache's, so we diff based off what we have in the fingerprint store.
if (oldPipSession.WeakFingerprint != newPipSession.WeakFingerprint)
{
WriteLine("WeakFingerprint", writer);
WriteLine(JsonTree.PrintTreeDiff(oldPipSession.GetWeakFingerprintTree(), newPipSession.GetWeakFingerprintTree()), writer);
result = CacheMissAnalysisResult.WeakFingerprintMismatch;
}
else if (oldPipSession.StrongFingerprint != newPipSession.StrongFingerprint)
{
WriteLine("StrongFingerprint", writer);
WriteLine(JsonTree.PrintTreeDiff(oldPipSession.GetStrongFingerprintTree(), newPipSession.GetStrongFingerprintTree()), writer);
result = CacheMissAnalysisResult.StrongFingerprintMismatch;
}
else
{
WriteLine("The fingerprints from both builds matched and no cache retrieval errors occurred.", writer);
WriteLine(RepeatedStrings.DisallowedFileAccessesOrPipFailuresPreventCaching, writer, oldPipSession.PipWriter, newPipSession.PipWriter);
result = CacheMissAnalysisResult.UncacheablePip;
}
}
return(result);
}