Nested json serialization problem

[sallyruthstruik]

Got an error with logging inner json:

test_logger.info('python-logstash: test extra fields', extra=extra)

class Test:

    def __init__(self):
        self.a = 1
        self.b = 1

    def __repr__(self):
        return "Test(a={}, b={})".format(self.a, self.b)

test_logger.info("test inner json", extra={"meta": {"test": Test()}})

Gives:

Traceback (most recent call last):
  File "/usr/lib/python2.7/logging/handlers.py", line 577, in emit
    s = self.makePickle(record)
  File "/home/stas/workspace/partners/python-logstash/logstash/handler_udp.py", line 17, in makePickle
    return self.formatter.format(record)
  File "/home/stas/workspace/partners/python-logstash/logstash/formatter.py", line 142, in format
    return self.serialize(message)
  File "/home/stas/workspace/partners/python-logstash/logstash/formatter.py", line 83, in serialize
    return json.dumps(message)
  File "/usr/lib/python2.7/json/__init__.py", line 243, in dumps
    return _default_encoder.encode(obj)
  File "/usr/lib/python2.7/json/encoder.py", line 207, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/usr/lib/python2.7/json/encoder.py", line 270, in iterencode
    return _iterencode(o, 0)
  File "/usr/lib/python2.7/json/encoder.py", line 184, in default
    raise TypeError(repr(o) + " is not JSON serializable")
TypeError: Test(a=1, b=1) is not JSON serializable

[sallyruthstruik]

Solved in #61

[wizardion]

These changes #90 will fix the issue.

[wizardion]

To avoid encoding issues, and converting values to Unicode, please use this library: from __future__ import unicode_literals