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Handle eventhub cardinality #24

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Sep 4, 2019
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134 changes: 114 additions & 20 deletions azure/functions/eventhub.py
Original file line number Diff line number Diff line change
Expand Up @@ -22,34 +22,70 @@ def check_output_type_annotation(cls, pytype) -> bool:
)

@classmethod
def decode(cls, data: meta.Datum, *,
trigger_metadata) -> _eventhub.EventHubEvent:
def decode(
cls, data: meta.Datum, *, trigger_metadata
) -> typing.Union[_eventhub.EventHubEvent,
typing.List[_eventhub.EventHubEvent]]:
data_type = data.type

if data_type == 'string':
body = data.value.encode('utf-8')

elif data_type == 'bytes':
body = data.value
if (data_type == 'string' or data_type == 'bytes'
or data_type == 'json'):
return cls.decode_single_event(data, trigger_metadata)

elif data_type == 'json':
body = data.value.encode('utf-8')
elif (data_type == 'collection_bytes'
or data_type == 'collection_string'):
return cls.decode_multiple_events(data, trigger_metadata)

else:
raise NotImplementedError(
f'unsupported event data payload type: {data_type}')

@classmethod
def decode_single_event(cls, data,
trigger_metadata) -> _eventhub.EventHubEvent:
if data.type == 'string':
body = data.value.encode('utf-8')

elif data.type == 'bytes':
body = data.value

elif data.type == 'json':
body = data.value.encode('utf-8')

return _eventhub.EventHubEvent(body=body)

@classmethod
def decode_multiple_events(
cls, data, trigger_metadata
) -> typing.List[_eventhub.EventHubEvent]:
if data.type == 'collection_bytes':
parsed_data = data.value.bytes

elif data.type == 'collection_string':
parsed_data = data.value.string

events = []
for i in range(len(parsed_data)):
event = _eventhub.EventHubEvent(body=parsed_data[i])
events.append(event)

return events

@classmethod
def encode(cls, obj: typing.Any, *,
expected_type: typing.Optional[type]) -> meta.Datum:
expected_type: typing.Optional[type]
) -> meta.Datum:
data = meta.Datum(type=None, value=None)

if isinstance(obj, str):
data = meta.Datum(type='string', value=obj)

elif isinstance(obj, bytes):
data = meta.Datum(type='bytes', value=obj)

elif isinstance(obj, int):
data = meta.Datum(type='int', value=obj)

elif isinstance(obj, list):
data = meta.Datum(type='json', value=json.dumps(obj))

Expand All @@ -58,25 +94,37 @@ def encode(cls, obj: typing.Any, *,

class EventHubTriggerConverter(EventHubConverter,
binding='eventHubTrigger', trigger=True):

@classmethod
def decode(cls, data: meta.Datum, *,
trigger_metadata) -> _eventhub.EventHubEvent:
def decode(
cls, data: meta.Datum, *, trigger_metadata
) -> typing.Union[_eventhub.EventHubEvent,
typing.List[_eventhub.EventHubEvent]]:
data_type = data.type

if data_type == 'string':
body = data.value.encode('utf-8')

elif data_type == 'bytes':
body = data.value
if (data_type == 'string' or data_type == 'bytes'
or data_type == 'json'):
return cls.decode_single_event(data, trigger_metadata)

elif data_type == 'json':
body = data.value.encode('utf-8')
elif (data_type == 'collection_bytes'
or data_type == 'collection_string'):
return cls.decode_multiple_events(data, trigger_metadata)

else:
raise NotImplementedError(
f'unsupported event data payload type: {data_type}')

@classmethod
def decode_single_event(cls, data,
trigger_metadata) -> _eventhub.EventHubEvent:
if data.type == 'string':
body = data.value.encode('utf-8')

elif data.type == 'bytes':
body = data.value

elif data.type == 'json':
body = data.value.encode('utf-8')

iothub_metadata = {}
for f in trigger_metadata:
if f.startswith('iothub-'):
Expand All @@ -96,3 +144,49 @@ def decode(cls, data: meta.Datum, *,
trigger_metadata, 'Offset', python_type=str),
iothub_metadata=iothub_metadata
)

@classmethod
def decode_multiple_events(
cls, data, trigger_metadata
) -> typing.List[_eventhub.EventHubEvent]:
if data.type == 'collection_bytes':
parsed_data = data.value.bytes

elif data.type == 'collection_string':
parsed_data = data.value.string

sys_props = trigger_metadata.get('SystemPropertiesArray')

parsed_sys_props = json.loads(sys_props.value)

if len(parsed_data) != len(parsed_sys_props):
raise AssertionError('Number of bodies and metadata mismatched')

events = []
for i in range(len(parsed_data)):
enqueued_time = parsed_sys_props[i].get('EnqueuedTimeUtc')
partition_key = cls.encode(
parsed_sys_props[i].get('PartitionKey'),
expected_type=str)
sequence_number = cls.encode(
parsed_sys_props[i].get('SequenceNumber'),
expected_type=int)
offset = cls.encode(
parsed_sys_props[i].get('Offset'),
expected_type=int)

event = _eventhub.EventHubEvent(
body=parsed_data[i],
enqueued_time=cls._parse_datetime(enqueued_time),
partition_key=cls._decode_typed_data(
partition_key, python_type=str),
sequence_number=cls._decode_typed_data(
sequence_number, python_type=int),
offset=cls._decode_typed_data(
offset, python_type=int),
iothub_metadata={}
)

events.append(event)

return events
14 changes: 13 additions & 1 deletion azure/functions/meta.py
Original file line number Diff line number Diff line change
Expand Up @@ -105,6 +105,18 @@ def _decode_typed_data(
elif data_type == 'double':
result = data.value

elif data_type == 'collection_bytes':
result = data.value

elif data_type == 'collection_string':
result = data.value

elif data_type == 'collection_sint64':
result = data.value

elif data_type is None:
return None

else:
raise ValueError(
f'unsupported type of {context}: {data_type}')
Expand Down Expand Up @@ -223,7 +235,7 @@ def check_output_type_annotation(cls, pytype: type) -> bool:

@abc.abstractclassmethod
def encode(cls, obj: typing.Any, *,
expeced_type: typing.Optional[type]) -> Datum:
expected_type: typing.Optional[type]) -> typing.Optional[Datum]:
raise NotImplementedError


Expand Down
4 changes: 2 additions & 2 deletions setup.py
Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@

setup(
name='azure-functions',
version='1.0.0b5',
version='1.0.3',
description='Azure Functions for Python',
author='Microsoft Corporation',
author_email='[email protected]',
Expand All @@ -15,7 +15,7 @@
'Operating System :: POSIX',
'Operating System :: MacOS :: MacOS X',
'Environment :: Web Environment',
'Development Status :: 3 - Alpha',
'Development Status :: 5 - Production/Stable',
],
license='MIT',
packages=['azure.functions'],
Expand Down