@message-queue-toolkit/kafka/dist/handler-container/KafkaHandlerContainer.js

Kafka adapter for message-queue-toolkit

const DEFAULT_HANDLER_KEY = Symbol('default-handler');
export class KafkaHandlerContainer {
    handlers;
    messageTypeField;
    constructor(topicHandlers, messageTypeField) {
        this.messageTypeField = messageTypeField;
        this.handlers = this.mapTopicHandlers(topicHandlers);
    }
    mapTopicHandlers(topicHandlerRouting) {
        const result = {};
        for (const [topic, topicHandlers] of Object.entries(topicHandlerRouting)) {
            if (!topicHandlers.length)
                continue;
            result[topic] = {};
            for (const handler of topicHandlers) {
                let handlerKey = this.messageTypeField
                    ? // @ts-expect-error
                        handler.schema.shape[this.messageTypeField]?.value
                    : undefined;
                handlerKey ??= DEFAULT_HANDLER_KEY;
                if (result[topic][handlerKey]) {
                    throw new Error(`Duplicate handler for topic ${topic}`);
                }
                result[topic][handlerKey] = handler;
            }
        }
        return result;
    }
    resolveHandler(topic, messageValue) {
        const handlers = this.handlers[topic];
        if (!handlers)
            return undefined;
        let messageValueType = undefined;
        // @ts-expect-error
        if (this.messageTypeField)
            messageValueType = messageValue[this.messageTypeField];
        return messageValueType
            ? (handlers[messageValueType] ?? handlers[DEFAULT_HANDLER_KEY])
            : handlers[DEFAULT_HANDLER_KEY];
    }
    get topics() {
        return Object.keys(this.handlers);
    }
}
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