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filetransfer: extract decompressor creation

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this will be necessary if we want download() to return a source instead
of consuming a sink, which will in turn be needed to remove coroutines.

Change-Id: I34ec241e9bbc5d32fbcd243b244e29c3757533aa
This commit is contained in:
eldritch horrors 2024-05-05 17:08:59 +02:00
parent 106b959043
commit 121edecf65
1 changed files with 11 additions and 12 deletions
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23
src/libstore/filetransfer.cc
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@ -710,9 +710,8 @@ struct curlFileTransfer : public FileTransfer
struct State {
bool done = false, failed = false;
std::exception_ptr exc;
std::string data;
std::string data, encoding;
std::condition_variable avail, request;
std::unique_ptr<FinishSink> decompressor;
};
auto _state = std::make_shared<Sync<State>>();
@ -736,7 +735,7 @@ struct curlFileTransfer : public FileTransfer
state->avail.notify_one();
state->request.notify_one();
}},
[_state, &sink](TransferItem & transfer, std::string_view data) {
[_state](TransferItem & transfer, std::string_view data) {
auto state(_state->lock());
if (state->failed) {
@ -744,10 +743,6 @@ struct curlFileTransfer : public FileTransfer
throw std::exception{};
}
if (!state->decompressor) {
state->decompressor = makeDecompressionSink(transfer.encoding, sink);
}
/* If the buffer is full, then go to sleep until the calling
thread wakes us up (i.e. when it has removed data from the
buffer). We don't wait forever to prevent stalling the
@ -764,11 +759,12 @@ struct curlFileTransfer : public FileTransfer
state->avail.notify_one();
});
std::unique_ptr<FinishSink> decompressor;
while (true) {
checkInterrupt();
std::string chunk;
FinishSink * sink = nullptr;
/* Grab data if available, otherwise wait for the download
thread to wake us up. */
@ -779,8 +775,8 @@ struct curlFileTransfer : public FileTransfer
if (state->done) {
if (state->exc) std::rethrow_exception(state->exc);
if (state->decompressor) {
state->decompressor->finish();
if (decompressor) {
decompressor->finish();
}
return;
}
@ -791,10 +787,13 @@ struct curlFileTransfer : public FileTransfer
}
chunk = std::move(state->data);
sink = state->decompressor.get();
/* Reset state->data after the move, since we check data.empty() */
state->data = "";
if (!decompressor) {
decompressor = makeDecompressionSink(state->encoding, sink);
}
state->request.notify_one();
}
@ -802,7 +801,7 @@ struct curlFileTransfer : public FileTransfer
if it's blocked on a full buffer. We don't hold the state
lock while doing this to prevent blocking the download
thread if sink() takes a long time. */
(*sink)(chunk);
(*decompressor)(chunk);
}
}
};