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Merge pull request #3822 from obsidiansystems/dump-thrice-fixme

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Optimize `addToStoreSlow` and remove `TeeParseSink`
This commit is contained in:
Eelco Dolstra 2020-07-20 18:55:05 +02:00 committed by GitHub
parent a79b6ddaa5 ac2fc7ba1f
commit 1c5f8bbfb5
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 69 additions and 54 deletions
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47
src/libstore/daemon.cc
View file

@ -173,31 +173,6 @@ struct TunnelSource : BufferedSource
}
};
/* If the NAR archive contains a single file at top-level, then save
the contents of the file to `s'. Otherwise barf. */
struct RetrieveRegularNARSink : ParseSink
{
bool regular;
string s;
RetrieveRegularNARSink() : regular(true) { }
void createDirectory(const Path & path)
{
regular = false;
}
void receiveContents(unsigned char * data, unsigned int len)
{
s.append((const char *) data, len);
}
void createSymlink(const Path & path, const string & target)
{
regular = false;
}
};
struct ClientSettings
{
bool keepFailed;
@ -391,9 +366,9 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
}
HashType hashAlgo = parseHashType(s);
StringSink savedNAR;
TeeSource savedNARSource(from, savedNAR);
RetrieveRegularNARSink savedRegular;
StringSink saved;
TeeSource savedNARSource(from, saved);
RetrieveRegularNARSink savedRegular { saved };
if (method == FileIngestionMethod::Recursive) {
/* Get the entire NAR dump from the client and save it to
@ -407,11 +382,7 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
logger->startWork();
if (!savedRegular.regular) throw Error("regular file expected");
auto path = store->addToStoreFromDump(
method == FileIngestionMethod::Recursive ? *savedNAR.s : savedRegular.s,
baseName,
method,
hashAlgo);
auto path = store->addToStoreFromDump(*saved.s, baseName, method, hashAlgo);
logger->stopWork();
to << store->printStorePath(path);
@ -727,15 +698,15 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
if (!trusted)
info.ultimate = false;
std::string saved;
std::unique_ptr<Source> source;
if (GET_PROTOCOL_MINOR(clientVersion) >= 21)
source = std::make_unique<TunnelSource>(from, to);
else {
TeeParseSink tee(from);
parseDump(tee, tee.source);
saved = std::move(*tee.saved.s);
source = std::make_unique<StringSource>(saved);
StringSink saved;
TeeSource tee { from, saved };
ParseSink ether;
parseDump(ether, tee);
source = std::make_unique<StringSource>(std::move(*saved.s));
}
logger->startWork();

12
src/libstore/export-import.cc
View file

@ -60,8 +60,10 @@ StorePaths Store::importPaths(Source & source, CheckSigsFlag checkSigs)
if (n != 1) throw Error("input doesn't look like something created by 'nix-store --export'");
/* Extract the NAR from the source. */
TeeParseSink tee(source);
parseDump(tee, tee.source);
StringSink saved;
TeeSource tee { source, saved };
ParseSink ether;
parseDump(ether, tee);
uint32_t magic = readInt(source);
if (magic != exportMagic)
@ -77,15 +79,15 @@ StorePaths Store::importPaths(Source & source, CheckSigsFlag checkSigs)
if (deriver != "")
info.deriver = parseStorePath(deriver);
info.narHash = hashString(htSHA256, *tee.saved.s);
info.narSize = tee.saved.s->size();
info.narHash = hashString(htSHA256, *saved.s);
info.narSize = saved.s->size();
// Ignore optional legacy signature.
if (readInt(source) == 1)
readString(source);
// Can't use underlying source, which would have been exhausted
auto source = StringSource { *tee.saved.s };
auto source = StringSource { *saved.s };
addToStore(info, source, NoRepair, checkSigs);
res.push_back(info.path);

37
src/libstore/store-api.cc
View file

@ -226,16 +226,41 @@ ValidPathInfo Store::addToStoreSlow(std::string_view name, const Path & srcPath,
FileIngestionMethod method, HashType hashAlgo,
std::optional<Hash> expectedCAHash)
{
/* FIXME: inefficient: we're reading/hashing 'tmpFile' three
/* FIXME: inefficient: we're reading/hashing 'tmpFile' two
times. */
HashSink narHashSink { htSHA256 };
HashSink caHashSink { hashAlgo };
RetrieveRegularNARSink fileSink { caHashSink };
auto [narHash, narSize] = hashPath(htSHA256, srcPath);
TeeSink sinkIfNar { narHashSink, caHashSink };
auto hash = method == FileIngestionMethod::Recursive
? hashAlgo == htSHA256
/* We use the tee sink if we need to hash the nar twice */
auto & sink = method == FileIngestionMethod::Recursive && hashAlgo != htSHA256
? static_cast<Sink &>(sinkIfNar)
: narHashSink;
auto fileSource = sinkToSource([&](Sink & sink) {
dumpPath(srcPath, sink);
});
TeeSource tapped { *fileSource, sink };
ParseSink blank;
auto & parseSink = method == FileIngestionMethod::Flat
? fileSink
: blank;
parseDump(
parseSink,
method == FileIngestionMethod::Recursive && hashAlgo == htSHA256
? *fileSource // don't need to hash twice if we just can use the `narHash` twice
: tapped);
auto [narHash, narSize] = narHashSink.finish();
auto hash = method == FileIngestionMethod::Recursive && hashAlgo == htSHA256
? narHash
: hashPath(hashAlgo, srcPath).first
: hashFile(hashAlgo, srcPath);
: caHashSink.finish().first;
if (expectedCAHash && expectedCAHash != hash)
throw Error("hash mismatch for '%s'", srcPath);

25
src/libutil/archive.hh
View file

@ -63,12 +63,29 @@ struct ParseSink
virtual void createSymlink(const Path & path, const string & target) { };
};
struct TeeParseSink : ParseSink
/* If the NAR archive contains a single file at top-level, then save
the contents of the file to `s'. Otherwise barf. */
struct RetrieveRegularNARSink : ParseSink
{
StringSink saved;
TeeSource source;
bool regular = true;
Sink & sink;
TeeParseSink(Source & source) : source(source, saved) { }
RetrieveRegularNARSink(Sink & sink) : sink(sink) { }
void createDirectory(const Path & path)
{
regular = false;
}
void receiveContents(unsigned char * data, unsigned int len)
{
sink(data, len);
}
void createSymlink(const Path & path, const string & target)
{
regular = false;
}
};
void parseDump(ParseSink & sink, Source & source);