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Implement RemoteStore::queryMissing()

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This provides a significant speedup, e.g. 64 s -> 12 s for

  nix-build --dry-run -I nixpkgs=channel:nixos-16.03 '<nixpkgs/nixos/tests/misc.nix>' -A test

on a cold local and CloudFront cache.

The alternative is to use lots of concurrent daemon connections but
that seems wasteful.
This commit is contained in:
Eelco Dolstra 2017-04-06 18:40:19 +02:00
parent 963f2bf12b
commit ba20730b3f
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GPG key ID: 8170B4726D7198DE
5 changed files with 44 additions and 3 deletions
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11
src/nix-daemon/nix-daemon.cc
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@ -592,6 +592,17 @@ static void performOp(ref<LocalStore> store, bool trusted, unsigned int clientVe
break;
}
case wopQueryMissing: {
PathSet targets = readStorePaths<PathSet>(*store, from);
startWork();
PathSet willBuild, willSubstitute, unknown;
unsigned long long downloadSize, narSize;
store->queryMissing(targets, willBuild, willSubstitute, unknown, downloadSize, narSize);
stopWork();
to << willBuild << willSubstitute << unknown << downloadSize << narSize;
break;
}
default:
throw Error(format("invalid operation %1%") % op);
}