def _default_value_formatter(
human_readable,
field_limit,
utc_timestamps=True,
encoding='utf-8',
):
"""
Create a value formatter based on several user-specified options.
"""
fields = {}
if human_readable:
fields = {
eliot_ns(u'timestamp'):
format.timestamp(include_microsecond=False,
utc_timestamps=utc_timestamps),
eliot_ns(u'duration'):
format.duration(),
}
return compose(
# We want tree-format to handle newlines.
partial(format.escape_control_characters, overrides={0x0a: u'\n'}),
partial(format.truncate_value, field_limit)
if field_limit else identity,
format.some(format.fields(fields), format.text(),
format.binary(encoding), format.anything(encoding)))
def test_mapping(self):
"""
Values for known field names are passed through their processor.
"""
fields = {
u'a': format.binary('utf-8'),
}
self.assertThat(
format.fields(fields)(u'\N{SNOWMAN}'.encode('utf-8'), u'a'),
ExactlyEquals(u'\N{SNOWMAN}'))
def test_missing_mapping(self):
"""
Values for unknown field names are ignored.
"""
self.assertThat(format.fields({})(b'hello', u'a'), Is(None))