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Create wrapper for Kafka topic handle dict
Modifications: * create new class `RDKafkaTopicHandles` that wraps a dictionary containing all topic names with their respective `rd_kafka_topic_t` handles * create method `KafkaClient.produce` wrapping the `rd_kafka_produce` method in a Swift way
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| //===----------------------------------------------------------------------===// | ||
| // | ||
| // This source file is part of the swift-kafka-gsoc open source project | ||
| // | ||
| // Copyright (c) 2022 Apple Inc. and the swift-kafka-gsoc project authors | ||
| // Licensed under Apache License v2.0 | ||
| // | ||
| // See LICENSE.txt for license information | ||
| // See CONTRIBUTORS.txt for the list of swift-kafka-gsoc project authors | ||
| // | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| import Crdkafka | ||
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| /// Swift class that matches topic names with their respective `rd_kafka_topic_t` handles. | ||
| internal class RDKafkaTopicHandles { | ||
| private var _internal: [String: OpaquePointer] | ||
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| // Note: we retain the client to ensure it does not get | ||
| // deinitialized before rd_kafka_topic_destroy() is invoked (required) | ||
| private let client: KafkaClient | ||
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| init(client: KafkaClient) { | ||
| self._internal = [:] | ||
| self.client = client | ||
| } | ||
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| deinit { | ||
| for (_, topicHandle) in self._internal { | ||
| rd_kafka_topic_destroy(topicHandle) | ||
| } | ||
| } | ||
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| /// Scoped accessor that enables safe access to the pointer of the topic's handle. | ||
| /// - Warning: Do not escape the pointer from the closure for later use. | ||
| /// - Parameter topic: The name of the topic that is addressed. | ||
| /// - Parameter topicConfig: The ``KafkaTopicConfiguration`` used for newly created topics. | ||
| /// - Parameter body: The closure will use the topic handle pointer. | ||
| @discardableResult | ||
| func withTopicHandlePointer<T>( | ||
| topic: String, | ||
| topicConfig: KafkaTopicConfiguration, | ||
| _ body: (OpaquePointer) throws -> T | ||
| ) throws -> T { | ||
| let topicHandle = try self.createTopicHandleIfNeeded(topic: topic, topicConfig: topicConfig) | ||
| return try body(topicHandle) | ||
| } | ||
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| /// Check `topicHandles` for a handle matching the topic name and create a new handle if needed. | ||
| /// - Parameter topic: The name of the topic that is addressed. | ||
| private func createTopicHandleIfNeeded( | ||
| topic: String, | ||
| topicConfig: KafkaTopicConfiguration | ||
| ) throws -> OpaquePointer { | ||
| if let handle = self._internal[topic] { | ||
| return handle | ||
| } else { | ||
| let rdTopicConf = try RDKafkaTopicConfig.createFrom(topicConfig: topicConfig) | ||
| let newHandle = self.client.withKafkaHandlePointer { kafkaHandle in | ||
| rd_kafka_topic_new( | ||
| kafkaHandle, | ||
| topic, | ||
| rdTopicConf | ||
| ) | ||
| // rd_kafka_topic_new deallocates topic config object | ||
| } | ||
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| guard let newHandle else { | ||
| // newHandle is nil, so we can retrieve error through rd_kafka_last_error() | ||
| let error = KafkaError.rdKafkaError(wrapping: rd_kafka_last_error()) | ||
| throw error | ||
| } | ||
| self._internal[topic] = newHandle | ||
| return newHandle | ||
| } | ||
| } | ||
| } |