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<h1><a href="../../index.html">All files</a> / <a href="index.html">src/utils</a> logger.ts</h1>
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<span class="strong">83.67% </span>
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<span class='fraction'>41/49</span>
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<span class="strong">79.16% </span>
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<span class='fraction'>19/24</span>
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<span class="strong">73.68% </span>
<span class="quiet">Functions</span>
<span class='fraction'>14/19</span>
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<span class="strong">83.67% </span>
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<span class='fraction'>41/49</span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* Structured logging utility using Winston
*/
import winston from 'winston';
import { join } from 'path';
export enum LogLevel {
ERROR = 'error',
WARN = 'warn',
INFO = 'info',
HTTP = 'http',
VERBOSE = 'verbose',
DEBUG = 'debug',
SILLY = 'silly'
}
export interface LogContext {
service?: string;
method?: string;
userId?: string;
requestId?: string;
duration?: number;
[key: string]: any;
}
export interface LogEntry {
level: LogLevel;
message: string;
context?: LogContext;
error?: Error;
timestamp?: Date;
}
/**
* Logger class providing structured logging with different levels
*/
export class Logger {
private winston: winston.Logger;
private static instance: Logger;
constructor(options?: {
level?: LogLevel;
enableConsole?: boolean;
enableFile?: boolean;
logDir?: string;
}) {
const {
level = LogLevel.INFO,
enableConsole = true,
enableFile = false,
logDir = './logs'
} = options || {};
const transports: winston.transport[] = [];
// Console transport with colored output
if (enableConsole) {
transports.push(
new winston.transports.Console({
format: winston.format.combine(
winston.format.colorize(),
winston.format.timestamp(),
winston.format.printf(<span class="fstat-no" title="function not covered" >({</span> timestamp, level, message, ...meta }) => {
const metaStr = <span class="cstat-no" title="statement not covered" >Object.keys(meta).length > 0 ? </span>
` ${JSON.stringify(meta, null, 2)}` : '';
<span class="cstat-no" title="statement not covered" > return `${timestamp} [${level}]: ${message}${metaStr}`;</span>
})
)
})
);
}
// File transport for persistent logging
<span class="missing-if-branch" title="if path not taken" >I</span>if (enableFile) {
<span class="cstat-no" title="statement not covered" > transports.push(</span>
new winston.transports.File({
filename: join(logDir, 'error.log'),
level: LogLevel.ERROR,
format: winston.format.combine(
winston.format.timestamp(),
winston.format.json()
)
}),
new winston.transports.File({
filename: join(logDir, 'combined.log'),
format: winston.format.combine(
winston.format.timestamp(),
winston.format.json()
)
})
);
}
this.winston = winston.createLogger({
level,
format: winston.format.combine(
winston.format.timestamp(),
winston.format.errors({ stack: true }),
winston.format.json()
),
transports,
// Don't exit on handled exceptions
exitOnError: false
});
// Handle uncaught exceptions and unhandled rejections
this.winston.exceptions.handle(
new winston.transports.Console({
format: winston.format.combine(
winston.format.colorize(),
winston.format.simple()
)
})
);
this.winston.rejections.handle(
new winston.transports.Console({
format: winston.format.combine(
winston.format.colorize(),
winston.format.simple()
)
})
);
}
/**
* Get singleton logger instance
*/
static getInstance(options?: {
level?: LogLevel;
enableConsole?: boolean;
enableFile?: boolean;
logDir?: string;
}): Logger {
if (!Logger.instance) {
Logger.instance = new Logger(options);
}
return Logger.instance;
}
/**
* Log an error message
*/
error(message: string, context?: LogContext, error?: Error): void {
this.log({
level: LogLevel.ERROR,
message,
context,
error
});
}
/**
* Log a warning message
*/
warn(message: string, context?: LogContext): void {
this.log({
level: LogLevel.WARN,
message,
context
});
}
/**
* Log an info message
*/
info(message: string, context?: LogContext): void {
this.log({
level: LogLevel.INFO,
message,
context
});
}
/**
* Log an HTTP request/response
*/
<span class="fstat-no" title="function not covered" > http(</span>message: string, context?: LogContext): void {
<span class="cstat-no" title="statement not covered" > this.log({</span>
level: LogLevel.HTTP,
message,
context
});
}
/**
* Log a verbose message
*/
<span class="fstat-no" title="function not covered" > verbose(</span>message: string, context?: LogContext): void {
<span class="cstat-no" title="statement not covered" > this.log({</span>
level: LogLevel.VERBOSE,
message,
context
});
}
/**
* Log a debug message
*/
debug(message: string, context?: LogContext): void {
this.log({
level: LogLevel.DEBUG,
message,
context
});
}
/**
* Log a silly level message
*/
<span class="fstat-no" title="function not covered" > silly(</span>message: string, context?: LogContext): void {
<span class="cstat-no" title="statement not covered" > this.log({</span>
level: LogLevel.SILLY,
message,
context
});
}
/**
* Log method entry with parameters
*/
methodEntry(service: string, method: string, params?: any): void {
this.debug(`Entering ${service}.${method}`, {
service,
method,
params: params ? JSON.stringify(params) : <span class="branch-1 cbranch-no" title="branch not covered" >undefined</span>
});
}
/**
* Log method exit with result
*/
methodExit(service: string, method: string, duration?: number, result?: any): void {
this.debug(`Exiting ${service}.${method}`, {
service,
method,
duration,
resultType: result ? typeof result : <span class="branch-1 cbranch-no" title="branch not covered" >undefined,</span>
resultLength: Array.isArray(result) ? result.length : undefined
});
}
/**
* Log method error
*/
methodError(service: string, method: string, error: Error, duration?: number): void {
this.error(`Error in ${service}.${method}: ${error.message}`, {
service,
method,
duration,
errorName: error.name,
errorStack: error.stack
}, error);
}
/**
* Core logging method
*/
private log(entry: LogEntry): void {
const { level, message, context, error } = entry;
const logData: any = {
message,
timestamp: new Date().toISOString(),
...context
};
if (error) {
logData.error = {
name: error.name,
message: error.message,
stack: error.stack
};
}
this.winston.log(level, logData);
}
/**
* Create a child logger with default context
*/
child(defaultContext: LogContext): Logger {
const childLogger = new Logger();
// Override the log method to include default context
const originalLog = childLogger.log.bind(childLogger);
childLogger.log = <span class="fstat-no" title="function not covered" >(e</span>ntry: LogEntry) => {
const mergedContext = <span class="cstat-no" title="statement not covered" >{ ...defaultContext, ...entry.context };</span>
<span class="cstat-no" title="statement not covered" > originalLog({ ...entry, context: mergedContext });</span>
};
return childLogger;
}
/**
* Set log level
*/
setLevel(level: LogLevel): void {
this.winston.level = level;
}
/**
* Get current log level
*/
getLevel(): string {
return this.winston.level;
}
}
// Export singleton instance
export const logger = Logger.getInstance({
level: (process.env.LOG_LEVEL as LogLevel) || LogLevel.INFO,
enableConsole: process.env.NODE_ENV !== 'test',
enableFile: process.env.ENABLE_FILE_LOGGING === 'true',
logDir: process.env.LOG_DIR || './logs'
});</pre></td></tr></table></pre>
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