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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import {
LogLevels,
getLevelByName,
getLevelName,
LevelName,
} from "./levels.ts";
import { BaseHandler } from "./handlers.ts";
export interface LogRecordOptions {
msg: string;
args: unknown[];
level: number;
loggerName: string;
}
export class LogRecord {
readonly msg: string;
#args: unknown[];
#datetime: Date;
readonly level: number;
readonly levelName: string;
readonly loggerName: string;
constructor(options: LogRecordOptions) {
this.msg = options.msg;
this.#args = [...options.args];
this.level = options.level;
this.loggerName = options.loggerName;
this.#datetime = new Date();
this.levelName = getLevelName(options.level);
}
get args(): unknown[] {
return [...this.#args];
}
get datetime(): Date {
return new Date(this.#datetime.getTime());
}
}
export interface LoggerOptions {
handlers?: BaseHandler[];
}
export class Logger {
level: number;
levelName: LevelName;
// eslint-disable-next-line @typescript-eslint/no-explicit-any
handlers: any[];
loggerName: string;
constructor(
loggerName: string,
levelName: LevelName,
options: LoggerOptions = {}
) {
this.loggerName = loggerName;
this.level = getLevelByName(levelName);
this.levelName = levelName;
this.handlers = options.handlers || [];
}
/** If the level of the logger is greater than the level to log, then nothing
* is logged, otherwise a log record is passed to each log handler. `msg` data
* passed in is returned. If a function is passed in, it is only evaluated
* if the msg will be logged and the return value will be the result of the
* function, not the function itself, unless the function isn't called, in which
* case undefined is returned. All types are coerced to strings for logging.
*/
_log<T>(
level: number,
msg: (T extends Function ? never : T) | (() => T),
...args: unknown[]
): T | undefined {
if (this.level > level) {
return msg instanceof Function ? undefined : msg;
}
let fnResult: T | undefined;
let logMessage: string;
if (msg instanceof Function) {
fnResult = msg();
logMessage = this.asString(fnResult);
} else {
logMessage = this.asString(msg);
}
const record: LogRecord = new LogRecord({
msg: logMessage,
args: args,
level: level,
loggerName: this.loggerName,
});
this.handlers.forEach((handler): void => {
handler.handle(record);
});
return msg instanceof Function ? fnResult : msg;
}
asString(data: unknown): string {
if (typeof data === "string") {
return data;
} else if (
data === null ||
typeof data === "number" ||
typeof data === "bigint" ||
typeof data === "boolean" ||
typeof data === "undefined" ||
typeof data === "symbol"
) {
return String(data);
} else if (typeof data === "object") {
return JSON.stringify(data);
}
return "undefined";
}
debug<T>(msg: () => T, ...args: unknown[]): T | undefined;
debug<T>(msg: T extends Function ? never : T, ...args: unknown[]): T;
debug<T>(
msg: (T extends Function ? never : T) | (() => T),
...args: unknown[]
): T | undefined {
return this._log(LogLevels.DEBUG, msg, ...args);
}
info<T>(msg: () => T, ...args: unknown[]): T | undefined;
info<T>(msg: T extends Function ? never : T, ...args: unknown[]): T;
info<T>(
msg: (T extends Function ? never : T) | (() => T),
...args: unknown[]
): T | undefined {
return this._log(LogLevels.INFO, msg, ...args);
}
warning<T>(msg: () => T, ...args: unknown[]): T | undefined;
warning<T>(msg: T extends Function ? never : T, ...args: unknown[]): T;
warning<T>(
msg: (T extends Function ? never : T) | (() => T),
...args: unknown[]
): T | undefined {
return this._log(LogLevels.WARNING, msg, ...args);
}
error<T>(msg: () => T, ...args: unknown[]): T | undefined;
error<T>(msg: T extends Function ? never : T, ...args: unknown[]): T;
error<T>(
msg: (T extends Function ? never : T) | (() => T),
...args: unknown[]
): T | undefined {
return this._log(LogLevels.ERROR, msg, ...args);
}
critical<T>(msg: () => T, ...args: unknown[]): T | undefined;
critical<T>(msg: T extends Function ? never : T, ...args: unknown[]): T;
critical<T>(
msg: (T extends Function ? never : T) | (() => T),
...args: unknown[]
): T | undefined {
return this._log(LogLevels.CRITICAL, msg, ...args);
}
}
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