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* Structured logger with OpenTelemetry context
*/
const api = require('@opentelemetry/api');
const amqp = require('amqplib');
class TelemetryLogger {
constructor(config = {}) {
// Default config with deep merge for rabbitmq
const defaultConfig = {
mode: 'off',
logLevel: 'INFO',
rabbitmq: {
url: 'amqp://localhost:5672',
exchange: 'telemetry.exchange'
}
};
this.config = {
...defaultConfig,
...config,
rabbitmq: {
...defaultConfig.rabbitmq,
...(config.rabbitmq || {})
}
};
this.connection = null;
this.channel = null;
this.connected = false;
// Log levels
this.levels = {
DEBUG: 5,
INFO: 9,
WARN: 13,
ERROR: 17,
FATAL: 21
};
// Current log level
this.currentLevel = this.levels[this.config.logLevel] || this.levels.INFO;
// Connect to RabbitMQ for log export
this.connect();
}
async connect() {
if (this.config.mode === 'off') return;
try {
this.connection = await amqp.connect(this.config.rabbitmq.url);
this.channel = await this.connection.createChannel();
await this.channel.assertExchange(
this.config.rabbitmq.exchange,
'topic',
{ durable: true }
);
this.connected = true;
} catch (error) {
console.error('[Logger] Failed to connect to RabbitMQ:', error.message);
}
}
/**
* Core logging method
*/
log(level, message, data = {}) {
const levelValue = this.levels[level.toUpperCase()] || this.levels.INFO;
// Check log level
if (levelValue < this.currentLevel) return;
// Get OpenTelemetry context
const span = api.trace.getActiveSpan();
const spanContext = span ? span.spanContext() : null;
const logEntry = {
timestamp: new Date().toISOString(),
service_name: this.config.serviceName,
severity_text: level.toUpperCase(),
severity_number: levelValue,
body: { message },
trace_id: spanContext ? spanContext.traceId : null,
span_id: spanContext ? spanContext.spanId : null,
resource_attributes: {
'service.name': this.config.serviceName,
'service.version': this.config.serviceVersion,
'deployment.environment': this.config.environment
},
log_attributes: {
...data,
'process.pid': process.pid,
'host.name': require('os').hostname()
}
};
// Log to console
const consoleMethod = level === 'error' || level === 'fatal' ? 'error' : 'log';
console[consoleMethod](
`[${level.toUpperCase()}] ${message}`,
spanContext ? `[trace:${spanContext.traceId}]` : '',
data
);
// Send to RabbitMQ
this.sendToRabbitMQ(logEntry);
}
/**
* Send log to RabbitMQ
*/
sendToRabbitMQ(logEntry) {
Eif (!this.connected || !this.channel) return;
try {
const routingKey = `telemetry.logs.${this.config.serviceName}`;
const message = Buffer.from(JSON.stringify(logEntry));
this.channel.publish(
this.config.rabbitmq.exchange,
routingKey,
message,
{ persistent: true }
);
} catch (error) {
// Silently fail - don't log to avoid infinite loop
}
}
/**
* Convenience methods
*/
debug(message, data) {
this.log('debug', message, data);
}
info(message, data) {
this.log('info', message, data);
}
warn(message, data) {
this.log('warn', message, data);
}
error(message, data) {
this.log('error', message, data);
}
fatal(message, data) {
this.log('fatal', message, data);
}
/**
* Close logger connection
*/
async close() {
if (this.channel) {
await this.channel.close();
}
if (this.connection) {
await this.connection.close();
}
}
}
/**
* Create logger instance
*/
function createLogger(config) {
return new TelemetryLogger(config);
}
module.exports = {
TelemetryLogger,
createLogger
}; |