Make request I/O pure and expose the fd #82
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aantron
commented
Jun 12, 2017
| | (Destroy k) as exn -> IO.fail exn | ||
| | exn -> | ||
| log_error ("Unknown exception caught: "^(Printexc.to_string exn)); | ||
| IO.(Out.write_error log_error req Errno.EIO | ||
| >>= fun () -> fail exn) |
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FYI this line is the only reason why requests return a response list, instead of just a single response.
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Ah yes, this mechanism is rather messy... I think it can probably be simplified but continue your work as-is for now.
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One option for faithfully encoding this without a list is to add another variand, something like `Error_and_raise _.
Signed-off-by: Anton Bachin <[email protected]>
Signed-off-by: Anton Bachin <[email protected]>
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dispatchand helpers so that they do not write to the request fd. Instead, they return lists of writing operations, to be performed by the same outer code that reads from the fd, and callsdispatch.