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sdk: fix ConsoleSpanExporter #455

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merged 4 commits into from
Mar 4, 2020
Merged

sdk: fix ConsoleSpanExporter #455

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d691412
sdk: fix ConsoleSpanExporter
mauriciovasquezbernal Mar 2, 2020
17bfd52
use os.linesep instead of \n
mauriciovasquezbernal Mar 3, 2020
4b214d8
fix import order
mauriciovasquezbernal Mar 3, 2020
9d19288
use os.linesep also in tests
mauriciovasquezbernal Mar 3, 2020
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4 changes: 3 additions & 1 deletion opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -270,12 +270,14 @@ class ConsoleSpanExporter(SpanExporter):
def __init__(
self,
out: typing.IO = sys.stdout,
formatter: typing.Callable[[Span], str] = str,
formatter: typing.Callable[[Span], str] = lambda span: str(span)
+ "\n",
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Suggested change
formatter: typing.Callable[[Span], str] = lambda span: str(span)
+ "\n",
formatter: typing.Callable[[Span], str] = str,

Along with the other comment suggestion only.

):
self.out = out
self.formatter = formatter

def export(self, spans: typing.Sequence[Span]) -> SpanExportResult:
for span in spans:
self.out.write(self.formatter(span))
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Consider doing this to avoid two linebreaks for formatters that do end in a newline:

Suggested change
self.out.write(self.formatter(span))
self.out.write(endline(self.formatter(span)))

with this in the module:

def endline(line):
    if line.endswith(os.linesep):
        return line
    return line + os.linesep

I haven't checked for windows, but suspect you do want os.linesep here instead of "\n".

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I'm not totally sure about this one, I think we should let full control to the user, for instance, there could be a case where the user doesn't want to have line breaks at all and use another separator.

I totally agree about the os.linesep, I'm too focus on Linux now 😝

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Btw, if a formatter ends with a linebreak there would not be two linebreaks, I only adding a linebreak to the default formatter.

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I think agreed to not force lineseps, formatter should control that (and the flush handles this anyway).

self.out.flush()
return SpanExportResult.SUCCESS
3 changes: 2 additions & 1 deletion opentelemetry-sdk/tests/trace/export/test_export.py
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Original file line number Diff line number Diff line change
Expand Up @@ -288,8 +288,9 @@ def test_export(self): # pylint: disable=no-self-use
span = trace.Span("span name", mock.Mock())
with mock.patch.object(exporter, "out") as mock_stdout:
exporter.export([span])
mock_stdout.write.assert_called_once_with(str(span))
mock_stdout.write.assert_called_once_with(str(span) + "\n")
self.assertEqual(mock_stdout.write.call_count, 1)
self.assertEqual(mock_stdout.flush.call_count, 1)

def test_export_custom(self): # pylint: disable=no-self-use
"""Check that console exporter uses custom io, formatter."""
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