add autosplit example

Author: vgvoleg

examples/topic/autosplit_example.py

@@ -0,0 +1,90 @@
+import argparse
+import asyncio
+import datetime
+import logging
+
+import ydb
+
+logger = logging.getLogger(__name__)
+logger.setLevel(logging.DEBUG)
+
+
+async def connect(endpoint: str, database: str) -> ydb.aio.Driver:
+    config = ydb.DriverConfig(endpoint=endpoint, database=database)
+    config.credentials = ydb.credentials_from_env_variables()
+    driver = ydb.aio.Driver(config)
+    await driver.wait(5, fail_fast=True)
+    return driver
+
+
+async def recreate_topic(driver: ydb.aio.Driver, topic: str, consumer: str):
+    try:
+        await driver.topic_client.drop_topic(topic)
+    except ydb.SchemeError:
+        pass
+
+    await driver.topic_client.create_topic(
+        topic,
+        consumers=[consumer],
+        max_active_partitions=100,
+        auto_partitioning_settings=ydb.TopicAutoPartitioningSettings(
+            strategy=ydb.TopicAutoPartitioningStrategy.SCALE_UP,
+            up_utilization_percent=1,
+            down_utilization_percent=1,
+            stabilization_window=datetime.timedelta(seconds=1),
+        ),
+    )
+
+
+async def write_messages(driver: ydb.aio.Driver, topic: str, id: int = 0):
+    async with driver.topic_client.writer(topic) as writer:
+        for i in range(100):
+            mess = ydb.TopicWriterMessage(data=f"[{id}] mess-{i}", metadata_items={"index": f"{i}"})
+            await writer.write(mess)
+            await asyncio.sleep(0.01)
+
+
+async def read_messages(driver: ydb.aio.Driver, topic: str, consumer: str):
+    async with driver.topic_client.reader(topic, consumer, auto_partitioning_support=True) as reader:
+        count = 0
+        while True:
+            try:
+                mess = await asyncio.wait_for(reader.receive_message(), 5)
+                count += 1
+                print(mess.data.decode())
+                reader.commit(mess)
+            except asyncio.TimeoutError:
+                assert count == 200
+                return
+
+
+
+async def main():
+    parser = argparse.ArgumentParser(
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+        description="""YDB topic basic example.\n""",
+    )
+    parser.add_argument("-d", "--database", default="/local", help="Name of the database to use")
+    parser.add_argument("-e", "--endpoint", default="grpc://localhost:2136", help="Endpoint url to use")
+    parser.add_argument("-p", "--path", default="test-topic", help="Topic name")
+    parser.add_argument("-c", "--consumer", default="consumer", help="Consumer name")
+    parser.add_argument("-v", "--verbose", default=True, action="store_true")
+
+
+    args = parser.parse_args()
+
+    if args.verbose:
+        logger.addHandler(logging.StreamHandler())
+
+    driver = await connect(args.endpoint, args.database)
+
+    await recreate_topic(driver, args.path, args.consumer)
+
+    await asyncio.gather(
+        write_messages(driver, args.path, 0),
+        write_messages(driver, args.path, 1),
+        read_messages(driver, args.path, args.consumer),
+    )
+
+if __name__ == "__main__":
+    asyncio.run(main())