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Add gRPC Source Python server side (LangStream#455)
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134
...runtime/langstream-runtime-impl/src/main/python/langstream_grpc/tests/test_grpc_source.py
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| # | ||
| # Copyright DataStax, Inc. | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
| # | ||
|
|
||
| import json | ||
| import queue | ||
| from io import BytesIO | ||
| from typing import List | ||
|
|
||
| import fastavro | ||
| import grpc | ||
| import pytest | ||
|
|
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| from langstream_grpc.grpc_service import AgentServer | ||
| from langstream_grpc.proto.agent_pb2 import ( | ||
| SourceResponse, | ||
| SourceRequest, | ||
| ) | ||
| from langstream_grpc.proto.agent_pb2_grpc import AgentServiceStub | ||
| from langstream_runtime.api import Record, RecordType, Source | ||
| from langstream_runtime.util import SimpleRecord, AvroValue | ||
|
|
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|
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| @pytest.fixture(autouse=True) | ||
| def server_and_stub(): | ||
| config = """{ | ||
| "className": "langstream_grpc.tests.test_grpc_source.MySource" | ||
| }""" | ||
| server = AgentServer("[::]:0", config) | ||
| server.start() | ||
| channel = grpc.insecure_channel("localhost:%d" % server.port) | ||
|
|
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| yield server, AgentServiceStub(channel=channel) | ||
|
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| channel.close() | ||
| server.stop() | ||
|
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|
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| def test_read(server_and_stub): | ||
| server, stub = server_and_stub | ||
|
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| responses: list[SourceResponse] | ||
| responses = list(stub.read(iter([]))) | ||
|
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| response_schema = responses[0] | ||
| assert len(response_schema.records) == 0 | ||
| assert response_schema.HasField("schema") | ||
| assert response_schema.schema.schema_id == 1 | ||
| schema = response_schema.schema.value.decode("utf-8") | ||
| assert ( | ||
| schema | ||
| == '{"name":"test.Test","type":"record","fields":[{"name":"field","type":"string"}]}' # noqa: E501 | ||
| ) | ||
|
|
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| response_record = responses[1] | ||
| assert len(response_schema.records) == 0 | ||
| record = response_record.records[0] | ||
| assert record.record_id == 1 | ||
| assert record.value.schema_id == 1 | ||
| fp = BytesIO(record.value.avro_value) | ||
| try: | ||
| decoded = fastavro.schemaless_reader(fp, json.loads(schema)) | ||
| assert decoded == {"field": "test"} | ||
| finally: | ||
| fp.close() | ||
|
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|
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| def test_commit(server_and_stub): | ||
| server, stub = server_and_stub | ||
| to_commit = queue.Queue() | ||
|
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| def send_commit(): | ||
| committed = 0 | ||
| while committed < 2: | ||
| try: | ||
| commit_id = to_commit.get(True) | ||
| yield SourceRequest(committed_records=[commit_id]) | ||
| committed += 1 | ||
| except queue.Empty: | ||
| pass | ||
|
|
||
| with pytest.raises(grpc.RpcError): | ||
| response: SourceResponse | ||
| for response in stub.read(iter(send_commit())): | ||
| for record in response.records: | ||
| to_commit.put(record.record_id) | ||
|
|
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| assert len(server.agent.committed) == 1 | ||
| assert server.agent.committed[0] == server.agent.sent[0] | ||
|
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|
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| class MySource(Source): | ||
| def __init__(self): | ||
| self.records = [ | ||
| SimpleRecord( | ||
| value=AvroValue( | ||
| schema={ | ||
| "type": "record", | ||
| "name": "Test", | ||
| "namespace": "test", | ||
| "fields": [{"name": "field", "type": {"type": "string"}}], | ||
| }, | ||
| value={"field": "test"}, | ||
| ) | ||
| ), | ||
| SimpleRecord(value=42), | ||
| ] | ||
| self.sent = [] | ||
| self.committed = [] | ||
|
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| def read(self) -> List[RecordType]: | ||
| if len(self.records) > 0: | ||
| record = self.records.pop(0) | ||
| self.sent.append(record) | ||
| return [record] | ||
| return [] | ||
|
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| def commit(self, records: List[Record]): | ||
| for record in records: | ||
| if record.value() == 42: | ||
| raise Exception("test error") | ||
| self.committed.extend(records) |