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allow output to a stream like stdout #155

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allow output to a stream like stdout #155

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27 changes: 14 additions & 13 deletions singer/messages.py
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Original file line number Diff line number Diff line change
Expand Up @@ -222,33 +222,34 @@ def format_message(message):
return json.dumps(message.asdict(), use_decimal=True)


def write_message(message):
sys.stdout.write(format_message(message) + '\n')
sys.stdout.flush()
def write_message(message, out=sys.stdout):
out.write(format_message(message) + '\n')
out.flush()


def write_record(stream_name, record, stream_alias=None, time_extracted=None):
def write_record(stream_name, record, stream_alias=None, time_extracted=None, out=sys.stdout):
"""Write a single record for the given stream.

write_record("users", {"id": 2, "email": "mike@stitchdata.com"})
"""
write_message(RecordMessage(stream=(stream_alias or stream_name),
record=record,
time_extracted=time_extracted))
time_extracted=time_extracted), out=out)


def write_records(stream_name, records):
def write_records(stream_name, records, out=sys.stdout):
"""Write a list of records for the given stream.

chris = {"id": 1, "email": "chris@stitchdata.com"}
mike = {"id": 2, "email": "mike@stitchdata.com"}
write_records("users", [chris, mike])
"""
for record in records:
write_record(stream_name, record)
write_record(stream_name, record, out=out)


def write_schema(stream_name, schema, key_properties, bookmark_properties=None, stream_alias=None):
def write_schema(stream_name, schema, key_properties, bookmark_properties=None, stream_alias=None,
out=sys.stdout):
"""Write a schema message.

stream = 'test'
Expand All @@ -266,22 +267,22 @@ def write_schema(stream_name, schema, key_properties, bookmark_properties=None,
stream=(stream_alias or stream_name),
schema=schema,
key_properties=key_properties,
bookmark_properties=bookmark_properties))
bookmark_properties=bookmark_properties), out=out)


def write_state(value):
def write_state(value, out=sys.stdout):
"""Write a state message.

write_state({'last_updated_at': '2017-02-14T09:21:00'})
"""
write_message(StateMessage(value=value))
write_message(StateMessage(value=value), out=out)


def write_version(stream_name, version):
def write_version(stream_name, version, out=sys.stdout):
"""Write an activate version message.

stream = 'test'
version = int(time.time())
write_version(stream, version)
"""
write_message(ActivateVersionMessage(stream_name, version))
write_message(ActivateVersionMessage(stream_name, version), out=out)