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* @file AvenxLogger.js
* @description Centralized logging module for the Avenx-JS framework.
* Supports trace, debug, info, warn, error, fatal log levels, alias log -> info,
* global silent/off option, custom formatters, and custom transports.
*/
export const LogLevels = {
trace: 0,
debug: 1,
info: 2,
warn: 3,
error: 4,
fatal: 5,
off: 6,
silent: 6,
};
/**
* Formats component context metadata (componentName, fileName) into a diagnostic tag.
* @param {object} context - Context object or component instance.
* @returns {string} Formatted context tag string or empty string.
*/
export function formatContextTag(context) {
if (!context || typeof context !== 'object' || context instanceof Error) {
return '';
}
let compName = context.componentName;
if (!compName && context.component) {
const comp = context.component;
compName = comp.componentName || comp.name || (comp.constructor && comp.constructor.name !== 'Object' && comp.constructor.name !== 'Function' ? comp.constructor.name : null);
}
if (!compName && context.name && context.name !== 'Error' && !context.name.endsWith('Error')) {
compName = context.name;
}
if (!compName && context.constructor && context.constructor.name !== 'Object' && context.constructor.name !== 'Function' && context.constructor.name !== 'Error' && !context.constructor.name.endsWith('Error')) {
compName = context.constructor.name;
}
let file = context.fileName || context.__filename || context.file;
if (!file && context.component) {
const comp = context.component;
file = comp.fileName || comp.__filename || comp.file;
}
if (compName && file) {
return `[${compName} <${file}>]`;
}
if (compName) {
return `[${compName}]`;
}
if (file) {
return `[<${file}>]`;
}
return '';
}
/**
* Default formatter for browser runtime.
* Prefixes messages with [Avenx level] and formats component context metadata if present.
* Preserves interactive object logs by prepending to string or prepending as separate arg.
* @param {string} level - Log level name.
* @param {any[]} args - Array of raw arguments.
* @returns {any[]} Array of formatted arguments.
*/
export function defaultFormatter(level, args) {
const prefix = `[Avenx ${level}]`;
if (!args || args.length === 0) {
return [prefix];
}
let contextTag = '';
const cleanArgs = [...args];
const lastArg = cleanArgs[cleanArgs.length - 1];
if (
lastArg &&
typeof lastArg === 'object' &&
!(lastArg instanceof Error) &&
!Array.isArray(lastArg)
) {
const isExplicitContext = Boolean(
lastArg.componentName ||
lastArg.fileName ||
lastArg.__filename ||
lastArg.component ||
lastArg.$logContext ||
lastArg.__isAvenxComponent
);
if (isExplicitContext) {
const tag = formatContextTag(lastArg);
if (tag) {
contextTag = tag;
cleanArgs.pop();
}
}
}
if (cleanArgs.length > 0) {
if (typeof cleanArgs[0] === 'string') {
const firstStr = contextTag ? `${prefix} ${contextTag} ${cleanArgs[0]}` : `${prefix} ${cleanArgs[0]}`;
return [firstStr, ...cleanArgs.slice(1)];
}
if (cleanArgs[0] instanceof Error) {
return contextTag ? [`${prefix} ${contextTag}`, ...cleanArgs] : cleanArgs;
}
}
return contextTag ? [`${prefix} ${contextTag}`, ...cleanArgs] : [prefix, ...cleanArgs];
}
/**
* Default console transport.
* Dispatches messages to console methods dynamically.
*/
export const consoleTransport = {
log(level, formattedArgs) {
const method = level === 'fatal' ? 'error' : level === 'trace' ? 'debug' : console[level] ? level : 'log';
if (typeof console !== 'undefined' && console[method]) {
console[method](...formattedArgs);
}
},
};
/**
* @typedef {Object} LoggingConfig
* @property {('trace'|'debug'|'info'|'warn'|'error'|'fatal')} [level='info'] - The minimum severity level to output.
* @property {boolean} [silent=false] - Global silence setting. If true, suppresses all logging.
* @property {Function} [formatter=defaultFormatter] - Custom formatting callback function. Receives (level, args).
* @property {Array<Object|Function>} [transports=[consoleTransport]] - Collection of transport targets.
*/
/**
* Central logger class for Avenx-JS framework.
* @example
* // 1. Basic initialization during application setup:
* const app = new AvenxApp({
* logging: {
* level: 'debug',
* silent: false
* }
* });
* @example
* // 2. Usage inside component methods:
* // Import the shared logger from the runtime entry point — component
* // instances do not expose `this.logger`.
* import { logger } from 'avenx-core/runtime';
*
* export default {
* name: 'TargetSyncComponent',
* methods: {
* async syncDatabase(targets) {
* logger.info('Starting celestial synchronization...', { count: targets.length });
* try {
* if (!targets || targets.length === 0) {
* logger.warn('Sync skipped: list is empty.');
* return;
* }
* logger.debug('Processing batch.', { sampleId: targets[0].id });
* } catch (error) {
* logger.error('Database sync failed.', { error: error.message });
* }
* }
* }
* };
* @example
* // 3. Registering a Custom Formatter:
* const customFormatter = (level, args) => {
* return [`[MY-APP] [${level.toUpperCase()}]:`, ...args];
* };
* const loggerWithFormatter = new AvenxLogger({ formatter: customFormatter });
* @example
* // 4. Registering a Custom Transport:
* const fileTransport = {
* log(level, formattedArgs, rawArgs) {
* // Append custom streaming/file logic here
* fs.appendFileSync('./app.log', formattedArgs.join(' ') + '\n');
* }
* };
* const loggerWithTransport = new AvenxLogger({ transports: [fileTransport] });
*/
export class AvenxLogger {
/**
* Creates an instance of AvenxLogger.
* @param {object} [config] - Application logger configuration options.
*/
constructor(config = {}) {
this.config = {
level: 'info',
silent: false,
formatter: defaultFormatter,
transports: [consoleTransport],
};
this.bindings = {};
this.configure(config);
}
/**
* Configures the logger instance options.
* @param {object} config - Configuration options.
*/
configure(config) {
if (!config) return;
this.config = {
...this.config,
...config,
};
// Ensure lowercase for level
if (typeof this.config.level === 'string') {
this.config.level = this.config.level.toLowerCase();
}
// Validate level against known LogLevels; fall back to 'info' on mismatch
if (LogLevels[this.config.level] === undefined) {
this.write('warn', `Invalid log level "${this.config.level}" — falling back to "info"`);
this.config.level = 'info';
}
}
/**
* Sets the minimum log severity level programmatically.
* @param {string} level - Log level name ('trace', 'debug', 'info', 'warn', 'error', 'fatal', 'off', 'silent').
*/
setLevel(level) {
this.configure({ level });
}
/**
* Helper to check if a specific level should be logged.
* @param {string} level - Log level to test.
* @returns {boolean} True if logger should log the given level.
*/
shouldLog(level) {
if (this.config.silent || this.config.level === 'silent' || this.config.level === 'off') {
return false;
}
const currentPriority = LogLevels[this.config.level] !== undefined ? LogLevels[this.config.level] : LogLevels.info;
const targetPriority = LogLevels[level] !== undefined ? LogLevels[level] : LogLevels.info;
return targetPriority >= currentPriority;
}
/**
* Writes the log statement through configured formatter and transports.
* @param {string} level - Log level name.
* @param {...any} args - Arguments to log.
*/
write(level, ...args) {
if (!this.shouldLog(level)) {
return;
}
const formatted = this.config.formatter ? this.config.formatter(level, args) : args;
const transports = Array.isArray(this.config.transports) ? this.config.transports : [consoleTransport];
for (const transport of transports) {
if (typeof transport === 'function') {
transport(level, formatted, args);
} else if (transport && typeof transport.log === 'function') {
transport.log(level, formatted, args);
}
}
}
/**
* Creates a child logger instance that inherits the parent's log level, transports, and formatter.
* Supports a string shorthand for prefix-only binding, or an object with prefix and/or componentName.
* Parent bindings are merged with the new bindings (child overrides parent on conflict).
* @param {string|object} [bindings] - Bindings configuration for the child logger.
* @param {string} [bindings.prefix] - A prefix string prepended to every formatted log message.
* @param {string} [bindings.componentName] - Component name injected as context metadata, formatted as [ComponentName] by defaultFormatter.
* @returns {AvenxLogger} A new logger instance with inherited configuration and merged bindings.
* @example
* // String shorthand
* const authLogger = logger.child('[AuthBridge]');
* authLogger.info('User logged in');
* // Output: [AuthBridge] [Avenx info] User logged in
* @example
* // Object bindings with context
* const dbLogger = logger.child({ prefix: '[DB]', componentName: 'DatabaseBridge' });
* dbLogger.warn('Connection slow');
* // Output: [DB] [Avenx warn] [DatabaseBridge] Connection slow
* @example
* // Nested child loggers
* const child = logger.child('[Parent]').child('[Child]');
*/
child(bindings = {}) {
const normBindings = typeof bindings === 'string' ? { prefix: bindings } : bindings;
const childLogger = new AvenxLogger(this.config);
childLogger.bindings = { ...this.bindings, ...normBindings };
const parentFormatter = this.config.formatter || defaultFormatter;
childLogger.config.formatter = (level, args) => {
const injectArgs = [...args];
if (childLogger.bindings.componentName) {
const lastArg = injectArgs[injectArgs.length - 1];
const hasContext =
lastArg &&
typeof lastArg === 'object' &&
!Array.isArray(lastArg) &&
!(lastArg instanceof Error) &&
(lastArg.componentName ||
lastArg.fileName ||
lastArg.__filename ||
lastArg.component ||
lastArg.$logContext ||
lastArg.__isAvenxComponent);
if (!hasContext) {
injectArgs.push({ componentName: childLogger.bindings.componentName });
}
}
const formatted = parentFormatter(level, injectArgs);
const prefix = childLogger.bindings.prefix || '';
if (prefix && formatted.length > 0) {
if (typeof formatted[0] === 'string') {
formatted[0] = `${prefix} ${formatted[0]}`;
} else {
formatted.unshift(prefix);
}
}
return formatted;
};
return childLogger;
}
/**
* Logs a message with trace level.
* @param {...any} args - Arguments to log.
*/
trace(...args) {
this.write('trace', ...args);
}
/**
* Logs a message with debug level.
* @param {...any} args - Arguments to log.
*/
debug(...args) {
this.write('debug', ...args);
}
/**
* Logs a message with info level.
* @param {...any} args - Arguments to log.
*/
info(...args) {
this.write('info', ...args);
}
/**
* Alias for info level logging.
* @param {...any} args - Arguments to log.
*/
log(...args) {
this.write('info', ...args);
}
/**
* Logs a message with warn level.
* @param {...any} args - Arguments to log.
*/
warn(...args) {
this.write('warn', ...args);
}
/**
* Logs a message with error level.
* @param {...any} args - Arguments to log.
*/
error(...args) {
this.write('error', ...args);
}
/**
* Logs a message with fatal level.
* @param {...any} args - Arguments to log.
*/
fatal(...args) {
this.write('fatal', ...args);
}
}
export const logger = new AvenxLogger();
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