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libstore/derivation-goal: avoid double-parsing of JSON messages

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To avoid that JSON messages are parsed twice in case of
remote builds with `ssh-ng://`, I split up the original
`handleJSONLogMessage` into three parts:

* `parseJSONMessage(const std::string&)` checks if it's a message in the
  form of `@nix {...}` and tries to parse it (and prints an error if the
  parsing fails).
* `handleJSONLogMessage(nlohmann::json&, ...)` reads the fields from the
  message and passes them to the logger.
* `handleJSONLogMessage(const std::string&, ...)` behaves as before, but
  uses the two functions mentioned above as implementation.

In case of `ssh-ng://`-logs the first two methods are invoked manually.
This commit is contained in:
Maximilian Bosch 2022-02-19 22:34:50 +01:00
parent 7a04839ea5
commit cd92ea5885
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GPG key ID: 091DBF4D1FC46B8E
3 changed files with 64 additions and 42 deletions
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14
src/libstore/build/derivation-goal.cc
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@ -1207,12 +1207,14 @@ void DerivationGoal::handleChildOutput(int fd, std::string_view data)
if (hook && fd == hook->fromHook.readSide.get()) {
for (auto c : data)
if (c == '\n') {
auto s = handleJSONLogMessage(currentHookLine, worker.act, hook->activities, true);
if (s && !isWrittenToLog && logSink) {
auto json = nlohmann::json::parse(std::string(currentHookLine, 5));
if (json["type"] == resBuildLogLine) {
auto f = json["fields"];
(*logSink)((f.size() > 0 ? f.at(0).get<std::string>() : "") + "\n");
auto json = parseJSONMessage(currentHookLine);
if (json) {
auto s = handleJSONLogMessage(*json, worker.act, hook->activities, true);
if (s && !isWrittenToLog && logSink) {
if ((*json)["type"] == resBuildLogLine) {
auto f = (*json)["fields"];
(*logSink)((f.size() > 0 ? f.at(0).get<std::string>() : "") + "\n");
}
}
}
currentHookLine.clear();