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refactor(libutil): add CompressedSource

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Introduce a `CompressedSource` class in libutil's `serialise.hh` that
compresses a `RestartableSource` and owns the compressed data. This is a
general-purpose utility that can be used anywhere compressed data needs
to be treated as a source.
This commit is contained in:
Bernardo Meurer Costa 2025-10-30 01:19:44 +00:00
parent bffbdcfddc
commit 93fe3354b5
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3 changed files with 61 additions and 9 deletions
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12
src/libstore/http-binary-cache-store.cc
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@ -141,18 +141,12 @@ void HttpBinaryCacheStore::upsertFile(
req.method = HttpMethod::PUT;
auto compressionMethod = getCompressionMethod(path);
std::string data;
std::optional<StringSource> stringSource{};
std::optional<CompressedSource> compressed;
if (compressionMethod) {
StringSink sink{};
auto compressionSink = makeCompressionSink(*compressionMethod, sink);
source.drainInto(*compressionSink);
compressionSink->finish();
data = std::move(sink.s);
compressed = CompressedSource(source, *compressionMethod);
req.headers.emplace_back("Content-Encoding", *compressionMethod);
stringSource = StringSource{data};
req.data = {*stringSource};
req.data = {compressed->size(), *compressed};
} else {
req.data = {sizeHint, source};
}