@dugongjs/kafkajs/adapters/outbound/message-broker/outbound-message-mapper-kafkajs.js

export class OutboundMessageMapperKafkaJS {
    map(domainEvent) {
        const { id, origin, aggregateType, aggregateId, type, version, sequenceNumber, timestamp, tenantId, correlationId, triggeredByUserId, triggeredByEventId, metadata, payload } = domainEvent;
        const message = {
            key: Buffer.from(aggregateId),
            value: payload ? Buffer.from(JSON.stringify(payload)) : null,
            headers: {
                id: Buffer.from(id),
                origin: Buffer.from(origin),
                aggregateType: Buffer.from(aggregateType),
                type: Buffer.from(type),
                version: Buffer.from(version.toString()),
                sequenceNumber: Buffer.from(sequenceNumber.toString()),
                timestamp: Buffer.from(timestamp.getTime().toString()),
                tenantId: tenantId ? Buffer.from(tenantId) : undefined,
                correlationId: correlationId ? Buffer.from(correlationId) : undefined,
                triggeredByUserId: triggeredByUserId ? Buffer.from(triggeredByUserId) : undefined,
                triggeredByEventId: triggeredByEventId ? Buffer.from(triggeredByEventId) : undefined,
                metadata: metadata ? Buffer.from(JSON.stringify(metadata)) : undefined
            }
        };
        // Kafka headers cannot have null/undefined values
        for (const [key, value] of Object.entries(message.headers ?? {})) {
            if (value == null) {
                delete message.headers[key];
            }
        }
        return message;
    }
}