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In the ExecResponse, store the event in the Output instead of message
data, so the server can iterate the Output directly and pass it to
WriteEvent directly.
The event ID now start at 1 with type "begin".
This is to minimize confusion when comparing empty Last-Event-ID from
client, which is equal to 0.
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In the test for AwwanLocal, use buffer with lock, so each write and
read is safe.
In the httpServer, the test found data race during ExecuteTail when
accessing [ExecResponse.EndAt].
We fix it by locking the resource during call to end() and when
accessing the EndAt field.
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The "share" project has been moved to SourceHut with new name
"pakakeh.go".
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Previously, if the command output is "line1\n\nline2\n", the web output
it as
line1
line2
it should be
line1
line2
This fix the empty line not displayed in wui output.
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In "/awwan/api/execute/tail" SSE endpoint, in order for client to be able
to reconnect and start streaming from the last know output, we need to
send the ID for each message that we send.
The ID is the index of Output in slice.
If client does not send Last-Event-ID, we send all Output from beginning,
otherwise, we send only message start from index in Last-Event-ID.
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The new API is "GET /awwan/api/execute/tail" that implement Server-sent
events, not a normal GET request.
Its accept the query parameter "id" with value is the execution ID
from "/awwan/api/execute".
Once called with valid ID, it will streaming the command output
to client.
By using this new API, the WUI can receive the output of command
immediately without waiting for all commands to be completed.
Implements: https://todo.sr.ht/~shulhan/awwan/5
Signed-off-by: Shulhan <ms@kilabit.info>
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Previously, the Execute endpoint wait for command execution to finish.
In case the command takes longer than proxy or server write timeout, it
will return with an timeout error to client.
In this changes, we generate an execution ID for each request and return
it immediately.
The next commit will implement HTTP endpoint to fetch the latest status
and/or output by execution ID.
References: https://todo.sr.ht/~shulhan/awwan/5
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