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Low-latency closure copy

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This adds a new store operation 'addMultipleToStore' that reads a
number of NARs and ValidPathInfos from a Source, allowing any number
of store paths to be copied in a single call. This is much faster on
high-latency links when copying a lot of small files, like .drv
closures.

For example, on a connection with an 50 ms delay:

Before:

  $ nix copy --to 'unix:///tmp/proxy-socket?root=/tmp/dest-chroot' \
    /nix/store/90jjw94xiyg5drj70whm9yll6xjj0ca9-hello-2.10.drv \
    --derivation --no-check-sigs
  real    0m57.868s
  user    0m0.103s
  sys     0m0.056s

After:

  real    0m0.690s
  user    0m0.017s
  sys     0m0.011s
This commit is contained in:
Eelco Dolstra 2021-07-26 13:31:09 +02:00
parent 9957315ce0
commit fe1f34fa60
8 changed files with 162 additions and 90 deletions
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46
src/libstore/path-info.cc Normal file
View file

@ -0,0 +1,46 @@
#include "path-info.hh"
#include "worker-protocol.hh"
namespace nix {
ValidPathInfo ValidPathInfo::read(Source & source, const Store & store, unsigned int format)
{
return read(source, store, format, store.parseStorePath(readString(source)));
}
ValidPathInfo ValidPathInfo::read(Source & source, const Store & store, unsigned int format, StorePath && path)
{
auto deriver = readString(source);
auto narHash = Hash::parseAny(readString(source), htSHA256);
ValidPathInfo info(path, narHash);
if (deriver != "") info.deriver = store.parseStorePath(deriver);
info.references = worker_proto::read(store, source, Phantom<StorePathSet> {});
source >> info.registrationTime >> info.narSize;
if (format >= 16) {
source >> info.ultimate;
info.sigs = readStrings<StringSet>(source);
info.ca = parseContentAddressOpt(readString(source));
}
return info;
}
void ValidPathInfo::write(
Sink & sink,
const Store & store,
unsigned int format,
bool includePath) const
{
if (includePath)
sink << store.printStorePath(path);
sink << (deriver ? store.printStorePath(*deriver) : "")
<< narHash.to_string(Base16, false);
worker_proto::write(store, sink, references);
sink << registrationTime << narSize;
if (format >= 16) {
sink << ultimate
<< sigs
<< renderContentAddress(ca);
}
}
}