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OK, this is a major rework.
* tcp_server: connection threads are not detached anymore, the caller has
to clean them up. This was done so that the server can clean up the
threads cleanly.
* run_queue: simple refactoring, run_queue_entry is called just run now.
* server: worker threads are now killed when a run is assigned to a
worker.
* worker: the connection to server is no longer persistent. A worker
sends "new-worker", waits for a task, closes the connection, and when
it's done, sends the "complete" message and waits for a new task.
This is supposed to improve resilience, since the worker-server
connections don't have to be maintained while the worker is doing a CI
run.
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* I don't really need to declare all variables at the top of the
function anymore.
* Default-initialize variables more.
* Don't set the output parameter until the object is completely
constructed.
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Explicit is better than implicit.
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Well, maybe "graceful" is a strong word, but now you _can_ do
./server &
./worker &
./client ci_run URL REV && kill "$( pidof worker )"
and the worker will wait for the CI run to complete.
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This adds a basic "worker" program.
You can now do something like
./server &
./worker &
./client ci_run URL REV
and the server should pass a message to worker, after which it should
clone the repository at URL, checkout REV, and try to run the CI script.
It's extremely unfinished: I need to sort out the graceful shutdown, how
the server manages workers, etc.
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A basic client-server app, the client sends commands as an array of
strings. Hopefully I didn't mess up, and hopefully it'll be useful.
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