chore: migrate consume multiple topics example to a proper project st…

…ructure (#145)

examples/consume-multiple-topics-example/README.md

@@ -0,0 +1,71 @@
+# Consume Multiple Topics Example
+
+Consume multiple topics example with `kstreams`
+
+## Requirements
+
+python 3.8+, poetry, docker-compose
+
+### Installation
+
+```bash
+poetry install
+```
+
+## Usage
+
+1. Start the kafka cluster: From `kstreams` project root execute `./scripts/cluster/start`
+2. Inside this folder execute `poetry run app`
+
+The app should publish 5 events with the same payload (i.e. `'{"message": "Hello world from topic {topic}!"}'`) to two topics: `local--kstreams-2` and `local--hello-world`.
+The `ConsumerRecord` will then be consumed and printed by the consumer.
+
+You should see something similar to the following logs:
+
+```bash
+❯ me@me-pc simple-example % poetry run app
+Topic local--kstreams-2 is not available during auto-create initialization
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Topic local--kstreams-2 is not available during auto-create initialization
+Topic local--kstreams-2 is not available during auto-create initialization
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Message sent: RecordMetadata(topic='local--kstreams-2', partition=0, topic_partition=TopicPartition(topic='local--kstreams-2', partition=0), offset=0, timestamp=1703694932136, timestamp_type=0, log_start_offset=0)
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Message sent: RecordMetadata(topic='local--hello-world', partition=0, topic_partition=TopicPartition(topic='local--hello-world', partition=0), offset=0, timestamp=1703694934271, timestamp_type=0, log_start_offset=0)
+Group Coordinator Request failed: [Error 15] GroupCoordinatorNotAvailableError
+Message sent: RecordMetadata(topic='local--kstreams-2', partition=0, topic_partition=TopicPartition(topic='local--kstreams-2', partition=0), offset=1, timestamp=1703694935284, timestamp_type=0, log_start_offset=0)
+Event consumed from topic: local--kstreams-2, headers: (), payload: b'{"message": "Hello world from topic local--kstreams-2!"}'
+Message sent: RecordMetadata(topic='local--hello-world', partition=0, topic_partition=TopicPartition(topic='local--hello-world', partition=0), offset=1, timestamp=1703694936320, timestamp_type=0, log_start_offset=0)
+Event consumed from topic: local--hello-world, headers: (), payload: b'{"message": "Hello world from topic local--hello-world!"}'
+Message sent: RecordMetadata(topic='local--kstreams-2', partition=0, topic_partition=TopicPartition(topic='local--kstreams-2', partition=0), offset=2, timestamp=1703694937336, timestamp_type=0, log_start_offset=0)
+Event consumed from topic: local--kstreams-2, headers: (), payload: b'{"message": "Hello world from topic local--kstreams-2!"}'
+Message sent: RecordMetadata(topic='local--hello-world', partition=0, topic_partition=TopicPartition(topic='local--hello-world', partition=0), offset=2, timestamp=1703694938349, timestamp_type=0, log_start_offset=0)
+Event consumed from topic: local--hello-world, headers: (), payload: b'{"message": "Hello world from topic local--hello-world!"}'
+Message sent: RecordMetadata(topic='local--kstreams-2', partition=0, topic_partition=TopicPartition(topic='local--kstreams-2', partition=0), offset=3, timestamp=1703694939361, timestamp_type=0, log_start_offset=0)
+Event consumed from topic: local--kstreams-2, headers: (), payload: b'{"message": "Hello world from topic local--kstreams-2!"}'
+Message sent: RecordMetadata(topic='local--hello-world', partition=0, topic_partition=TopicPartition(topic='local--hello-world', partition=0), offset=3, timestamp=1703694940376, timestamp_type=0, log_start_offset=0)
+Event consumed from topic: local--hello-world, headers: (), payload: b'{"message": "Hello world from topic local--hello-world!"}'
+Message sent: RecordMetadata(topic='local--kstreams-2', partition=0, topic_partition=TopicPartition(topic='local--kstreams-2', partition=0), offset=4, timestamp=1703694941386, timestamp_type=0, log_start_offset=0)
+Event consumed from topic: local--kstreams-2, headers: (), payload: b'{"message": "Hello world from topic local--kstreams-2!"}'
+Message sent: RecordMetadata(topic='local--hello-world', partition=0, topic_partition=TopicPartition(topic='local--hello-world', partition=0), offset=4, timestamp=1703694942404, timestamp_type=0, log_start_offset=0)
+Event consumed from topic: local--hello-world, headers: (), payload: b'{"message": "Hello world from topic local--hello-world!"}
+```
+
+## Note
+
+If you plan on using this example, pay attention to the `pyproject.toml` dependencies, where
+`kstreams` is pointing to the parent folder. You will have to set the latest version.

examples/consume-multiple-topics-example/consume_multiple_topics_example/__init__.py

@@ -0,0 +1 @@
+__version__ = "0.1.0"

examples/consume_multiple_topics.py → examples/consume-multiple-topics-example/consume_multiple_topics_example/app.py

@@ -25,11 +25,20 @@ async def produce(events_per_topic: int = 5, delay_seconds: int = 1) -> None:
             await asyncio.sleep(delay_seconds)
 
 
-async def main():
+async def start():
     await stream_engine.start()
     await produce()
+
+
+async def shutdown():
     await stream_engine.stop()
 
 
-if __name__ == "__main__":
-    asyncio.run(main())
+def main():
+    loop = asyncio.get_event_loop()
+    try:
+        loop.run_until_complete(start())
+        loop.run_forever()
+    finally:
+        loop.run_until_complete(shutdown())
+        loop.close()

examples/consume-multiple-topics-example/pyproject.toml

@@ -0,0 +1,20 @@
+[tool.poetry]
+name = "consume-multiple-topics-example"
+version = "0.1.0"
+description = ""
+authors = ["Marcos Schroh <[email protected]>, Santiago Fraire <[email protected]>, Alexandre Cirilo <[email protected]>"]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+aiorun = "^2022.4.1"
+kstreams = { path = "../../.", develop = true }
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
+
+
+[tool.poetry.scripts]
+app = "consume_multiple_topics_example.app:main"

tests/test_client.py

@@ -404,16 +404,21 @@ async def test_e2e_example():
     ),
 )
 async def test_e2e_consume_multiple_topics(monitoring_enabled):
-    from examples.consume_multiple_topics import produce, stream_engine, topics
+    consume_multiple_topics_example = importlib.import_module(
+        "examples.consume-multiple-topics-example.consume_multiple_topics_example.app"
+    )
 
     total_events = 2
-    client = TestStreamClient(stream_engine, monitoring_enabled=monitoring_enabled)
+    client = TestStreamClient(
+        consume_multiple_topics_example.stream_engine,
+        monitoring_enabled=monitoring_enabled,
+    )
 
     async with client:
-        await produce(total_events)
+        await consume_multiple_topics_example.produce(total_events)
 
-        topic_1 = TopicManager.get(topics[0])
-        topic_2 = TopicManager.get(topics[1])
+        topic_1 = TopicManager.get(consume_multiple_topics_example.topics[0])
+        topic_2 = TopicManager.get(consume_multiple_topics_example.topics[1])
 
         assert topic_1.total_events == total_events
         assert topic_2.total_events == total_events