ikiwiki/doc/bugs/proxy.py_utf8_troubles.mdwn

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when writing an external plugin using `proxy.py`, the getstate and setstate
functions don't accept unicode data:
uncaught exception: 'ascii' codec can't encode character u'\xe4' in position 25: ordinal not in range(128)
Traceback (most recent call last):
File "proxy.py", line 309, in run
self._in_fd, self._out_fd)
File "proxy.py", line 192, in handle_rpc
ret = self._dispatcher.dispatch(method, params)
File "proxy.py", line 84, in dispatch
return self._dispatch(method, params)
File "/usr/lib/python2.7/SimpleXMLRPCServer.py", line 420, in _dispatch
return func(*params)
File "proxy.py", line 251, in hook_proxy
ret = function(self, *args)
File "/home/chrysn/git/ikiwiki-plugins//plugins/my_plugin", line 49, in data2html
proxy.setstate(kwargs['page'], 'meta', 'title', unicode_containing_umlauts)
File "proxy.py", line 291, in setstate
return self.rpc('setstate', page, id, key, value)
File "proxy.py", line 233, in rpc
*args, **kwargs)
File "proxy.py", line 178, in send_rpc
cmd, data))
UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in position 25: ordinal not in range(128)
the culprit is the last `_debug_fn` invocation in `send_rpc` (line 178), where
unicode data is format-fed into a string. while this could be circumvented by
making the formatting string a unicode string, that would cause trouble with
python3 and we'd just move the problem to the stderr writing later on; instead,
"`cmd, data))`" should become "`cmd, repr(data)))`" and everything is fine.
debug output doesn't look that pretty any more, but is safe.
--[[chrysn]]
> ok, [[done]] --[[Joey]]