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Separate concerns in scanForReferences with TeeSink

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This also will make it easier to use a `HashModuloSink` instead for CA
derivations.
This commit is contained in:
John Ericson 2020-07-22 21:37:54 +00:00
parent 090960b725
commit c56356bacc
1 changed files with 7 additions and 8 deletions
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15
src/libstore/references.cc
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@ -48,13 +48,12 @@ static void search(const unsigned char * s, size_t len,
struct RefScanSink : Sink struct RefScanSink : Sink
{ {
HashSink hashSink;
StringSet hashes; StringSet hashes;
StringSet seen; StringSet seen;
string tail; string tail;
RefScanSink() : hashSink(htSHA256) { } RefScanSink() { }
void operator () (const unsigned char * data, size_t len); void operator () (const unsigned char * data, size_t len);
}; };
@ -62,8 +61,6 @@ struct RefScanSink : Sink
void RefScanSink::operator () (const unsigned char * data, size_t len) void RefScanSink::operator () (const unsigned char * data, size_t len)
{ {
hashSink(data, len);
/* It's possible that a reference spans the previous and current /* It's possible that a reference spans the previous and current
fragment, so search in the concatenation of the tail of the fragment, so search in the concatenation of the tail of the
previous fragment and the start of the current fragment. */ previous fragment and the start of the current fragment. */
@ -82,7 +79,9 @@ void RefScanSink::operator () (const unsigned char * data, size_t len)
PathSet scanForReferences(const string & path, PathSet scanForReferences(const string & path,
const PathSet & refs, HashResult & hash) const PathSet & refs, HashResult & hash)
{ {
RefScanSink sink; RefScanSink refsSink;
HashSink hashSink { htSHA256 };
TeeSink sink { refsSink, hashSink };
std::map<string, Path> backMap; std::map<string, Path> backMap;
/* For efficiency (and a higher hit rate), just search for the /* For efficiency (and a higher hit rate), just search for the
@ -97,7 +96,7 @@ PathSet scanForReferences(const string & path,
assert(s.size() == refLength); assert(s.size() == refLength);
assert(backMap.find(s) == backMap.end()); assert(backMap.find(s) == backMap.end());
// parseHash(htSHA256, s); // parseHash(htSHA256, s);
sink.hashes.insert(s); refsSink.hashes.insert(s);
backMap[s] = i; backMap[s] = i;
} }
@ -106,13 +105,13 @@ PathSet scanForReferences(const string & path,
/* Map the hashes found back to their store paths. */ /* Map the hashes found back to their store paths. */
PathSet found; PathSet found;
for (auto & i : sink.seen) { for (auto & i : refsSink.seen) {
std::map<string, Path>::iterator j; std::map<string, Path>::iterator j;
if ((j = backMap.find(i)) == backMap.end()) abort(); if ((j = backMap.find(i)) == backMap.end()) abort();
found.insert(j->second); found.insert(j->second);
} }
hash = sink.hashSink.finish(); hash = hashSink.finish();
return found; return found;
} }