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Store::queryValidPaths(): Use async queryPathInfo()

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This allows the binary cache substituter to pipeline requests.
This commit is contained in:
Eelco Dolstra 2016-10-07 19:43:36 +02:00
parent c663b84573
commit 844219f364
1 changed files with 38 additions and 3 deletions
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39
src/libstore/store-api.cc
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@ -363,12 +363,47 @@ void Store::queryPathInfo(const Path & storePath,
PathSet Store::queryValidPaths(const PathSet & paths)
{
struct State
{
size_t left;
PathSet valid;
std::exception_ptr exc;
};
Sync<State> state_(State{paths.size(), PathSet()});
std::condition_variable wakeup;
for (auto & path : paths)
if (isValidPath(path)) valid.insert(path);
queryPathInfo(path,
[path, &state_, &wakeup](ref<ValidPathInfo> info) {
auto state(state_.lock());
state->valid.insert(path);
assert(state->left);
if (!--state->left)
wakeup.notify_one();
},
[path, &state_, &wakeup](std::exception_ptr exc) {
auto state(state_.lock());
try {
std::rethrow_exception(exc);
} catch (InvalidPath &) {
} catch (...) {
state->exc = exc;
}
assert(state->left);
if (!--state->left)
wakeup.notify_one();
});
return valid;
while (true) {
auto state(state_.lock());
if (!state->left) {
if (state->exc) std::rethrow_exception(state->exc);
return state->valid;
}
state.wait(wakeup);
}
}