jiengup commented on code in PR #3613: URL: https://github.com/apache/iggy/pull/3613#discussion_r3566169348
########## examples/python/message-headers/producer.py: ########## @@ -0,0 +1,237 @@ +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you 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 argparse +import asyncio +import json +import secrets +import time +from collections.abc import Mapping +from typing import NamedTuple + +from apache_iggy import HeaderKey, HeaderValue, IggyClient, StreamDetails, TopicDetails +from apache_iggy import SendMessage as Message +from loguru import logger + +STREAM_NAME = "message-headers-stream" +TOPIC_NAME = "orders" +PARTITION_ID = 0 +BATCHES_LIMIT = 5 +MESSAGES_PER_BATCH = 10 + +ORDER_CREATED_TYPE = "OrderCreated" +ORDER_CONFIRMED_TYPE = "OrderConfirmed" +ORDER_REJECTED_TYPE = "OrderRejected" + +PlainHeaderValue = str | bytes | bool | int | float +PlainHeaders = dict[str, PlainHeaderValue] +TypedHeaders = dict[HeaderKey, HeaderValue] + + +class ArgNamespace(NamedTuple): + connection_string: str + + +class SerializedMessage(NamedTuple): + message_type: str + payload: str + headers: PlainHeaders | TypedHeaders + + +class MessagesGenerator: + def __init__(self): + self.order_id = 0 + + def generate(self) -> SerializedMessage: + self.order_id += 1 + message_type = self.order_id % 3 + + if message_type == 0: + payload = { + "orderId": f"order-{self.order_id}", + "customerId": f"customer-{secrets.randbelow(100)}", + "amount": secrets.randbelow(10000) + 1, + } + return self._serialize(ORDER_CREATED_TYPE, payload) + + if message_type == 1: + payload = { + "orderId": f"order-{self.order_id // 3}", + "timestamp": int(time.time() * 1000), + } + return self._serialize(ORDER_CONFIRMED_TYPE, payload) + + payload = { + "orderId": f"order-{self.order_id // 3}", + "reason": "Insufficient balance", + } + return self._serialize(ORDER_REJECTED_TYPE, payload) + + def _serialize( + self, message_type: str, payload: Mapping[str, object] + ) -> SerializedMessage: + encoded_payload = json.dumps(payload) + if self.order_id % 5 == 0: + # Add typed headers similar to the Rust core + typed_headers: TypedHeaders = { + HeaderKey.String("message-type"): HeaderValue.String(message_type), + HeaderKey.String("content-type"): HeaderValue.String( + "application/json" + ), + HeaderKey.String("schema-version"): HeaderValue.UnsignedInt16(1), + HeaderKey.String("created-at-ms"): HeaderValue.UnsignedInt64( + int(time.time() * 1000) + ), + HeaderKey.String("retryable"): HeaderValue.Bool( + message_type == ORDER_REJECTED_TYPE + ), + HeaderKey.String("priority-score"): HeaderValue.Float32( + (self.order_id % 100) / 100 + ), + HeaderKey.String("trace-bin"): HeaderValue.Raw( + f"trace-{self.order_id}".encode() + ), + HeaderKey.UnsignedInt32(self.order_id): HeaderValue.String("order-id"), + } + return SerializedMessage(message_type, encoded_payload, typed_headers) + + # Add easy-to-use `dict[str, str | bytes | bool | int | float]` headers + # which will be translated into typed headers by the Python SDK + plain_headers: PlainHeaders = { + "message-type": message_type, + "content-type": "application/json", + "schema-version": 1, + "created-at-ms": int(time.time() * 1000), + "retryable": message_type == ORDER_REJECTED_TYPE, + "priority-score": (self.order_id % 100) / 100, + "trace-bin": f"trace-{self.order_id}".encode(), + } + return SerializedMessage(message_type, encoded_payload, plain_headers) + + +def parse_args() -> ArgNamespace: + parser = argparse.ArgumentParser() + parser.add_argument( + "connection_string", + help=( + "Connection string for Iggy client, e.g. " + "'iggy+tcp://iggy:[email protected]:8090'" + ), + default="iggy+tcp://iggy:[email protected]:8090", + nargs="?", + type=str, + ) + return ArgNamespace(**vars(parser.parse_args())) + + +async def main(): + args: ArgNamespace = parse_args() + client = IggyClient.from_connection_string(args.connection_string) + logger.info("Connecting to Iggy") + await client.connect() + logger.info("Connected") + await init_system(client) + await produce_messages(client) + + +async def init_system(client: IggyClient): Review Comment: I don't get this point. The message header examples are implemented accroding to the existing `getting-started` example. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
