view hglib/error.py @ 179:c4c0efb37187

protocol: add the abilty to trace the protocol between the client and server

This is useful when debugging issues with driving hg via hglib
where output and error messages can be lost.

Call setprotocoltrace with the name of a trace function or None.
If the trace function is None no tracing is done.

The trace function is called with the direction, the channel-identified
and its data.

class CommandError(Exception):
    def __init__(self, args, ret, out, err):
        self.args = args
        self.ret = ret
        self.out = out
        self.err = err

    def __str__(self):
        return str((self.ret, self.out.rstrip(), self.err.rstrip()))

class ServerError(Exception):
    pass

class ResponseError(ServerError, ValueError):
    pass

class CapabilityError(ServerError):
    pass