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* RabbitMQ Exporter for OpenTelemetry
* Sends traces, metrics, and logs to RabbitMQ
*/
const amqp = require('amqplib');
const { ExportResult } = require('@opentelemetry/core');
// Fallback if ExportResult is not available
const ExportResultSuccess = ExportResult?.SUCCESS || { code: 0 };
const ExportResultFailed = ExportResult?.FAILED || { code: 1 };
class RabbitMQExporter {
constructor(config, type = 'traces') {
this.config = config;
this.type = type; // traces, metrics, or logs
this.connection = null;
this.channel = null;
this.connected = false;
this.queue = [];
this.maxQueueSize = config.maxQueueSize || 1000;
this.connect();
}
async connect() {
try {
this.connection = await amqp.connect(this.config.url);
this.channel = await this.connection.createChannel();
await this.channel.assertExchange(
this.config.exchange,
'topic',
{ durable: true }
);
this.connected = true;
console.log(`[RabbitMQ Exporter] Connected for ${this.type}`);
// Process queued items
this.flushQueue();
// Handle connection errors
this.connection.on('error', (err) => {
console.error('[RabbitMQ Exporter] Connection error:', err);
this.connected = false;
this.reconnect();
});
this.connection.on('close', () => {
console.log('[RabbitMQ Exporter] Connection closed');
this.connected = false;
this.reconnect();
});
} catch (error) {
console.error('[RabbitMQ Exporter] Failed to connect:', error);
this.reconnect();
}
}
reconnect() {
Iif (this.reconnectTimer) return;
this.reconnectTimer = setTimeout(() => {
this.reconnectTimer = null;
this.connect();
}, 5000);
}
/**
* Export spans to RabbitMQ
*/
export(spans, resultCallback) {
if (!Array.isArray(spans)) {
spans = [spans];
}
const telemetryData = spans.map(span => this.transformSpan(span));
telemetryData.forEach(data => {
this.send(data);
});
if (resultCallback) {
resultCallback({ code: ExportResultCode.SUCCESS });
}
return ExportResultSuccess;
}
/**
* Transform OpenTelemetry span to our format
*/
transformSpan(span) {
const spanContext = span.spanContext();
const attributes = {};
if (span.attributes) {
for (const [key, value] of Object.entries(span.attributes)) {
attributes[key] = value;
}
}
return {
trace_id: spanContext.traceId,
span_id: spanContext.spanId,
parent_span_id: span.parentSpanId,
service_name: span.resource?.attributes?.['service.name'] || 'unknown',
operation_name: span.name,
start_time: new Date(span.startTime[0] * 1000 + span.startTime[1] / 1000000).toISOString(),
end_time: span.endTime ? new Date(span.endTime[0] * 1000 + span.endTime[1] / 1000000).toISOString() : null,
status_code: span.status?.code || 0,
attributes: attributes
};
}
/**
* Send data to RabbitMQ
*/
send(data) {
if (!this.connected) {
// Queue if not connected
if (this.queue.length < this.maxQueueSize) {
this.queue.push(data);
}
return;
}
try {
const routingKey = `telemetry.${this.type}.${data.service_name}`;
const message = Buffer.from(JSON.stringify(data));
this.channel.publish(
this.config.exchange,
routingKey,
message,
{ persistent: true }
);
} catch (error) {
console.error('[RabbitMQ Exporter] Send error:', error);
// Re-queue on error
if (this.queue.length < this.maxQueueSize) {
this.queue.push(data);
}
}
}
/**
* Flush queued messages
*/
flushQueue() {
Eif (!this.connected || this.queue.length === 0) return;
const items = this.queue.splice(0, this.queue.length);
items.forEach(data => this.send(data));
}
/**
* Shutdown exporter
*/
async shutdown() {
if (this.reconnectTimer) {
clearTimeout(this.reconnectTimer);
}
if (this.channel) {
await this.channel.close();
}
if (this.connection) {
await this.connection.close();
}
return ExportResultSuccess;
}
/**
* Force flush
*/
async forceFlush() {
this.flushQueue();
return ExportResultSuccess;
}
}
/**
* Metrics exporter
*/
class RabbitMQMetricExporter extends RabbitMQExporter {
constructor(config) {
super(config, 'metrics');
}
export(metrics, resultCallback) {
const telemetryData = this.transformMetrics(metrics);
telemetryData.forEach(data => {
this.send(data);
});
if (resultCallback) {
resultCallback({ code: ExportResultCode.SUCCESS });
}
return ExportResultSuccess;
}
transformMetrics(metrics) {
const result = [];
metrics.resourceMetrics.forEach(resourceMetric => {
const serviceName = resourceMetric.resource.attributes['service.name'] || 'unknown';
resourceMetric.scopeMetrics.forEach(scopeMetric => {
scopeMetric.metrics.forEach(metric => {
metric.dataPoints.forEach(dataPoint => {
result.push({
timestamp: new Date(dataPoint.startTime[0] * 1000).toISOString(),
service_name: serviceName,
metric_name: metric.descriptor.name,
metric_type: this.getMetricType(metric.descriptor.type),
value: dataPoint.value,
unit: metric.descriptor.unit || '',
attributes: dataPoint.attributes || {}
});
});
});
});
});
return result;
}
getMetricType(type) {
const types = {
0: 'counter',
1: 'histogram',
2: 'gauge'
};
return types[type] || 'gauge';
}
}
module.exports = {
RabbitMQExporter,
RabbitMQMetricExporter
}; |