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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { Logger } from "./logger.ts";
import {
BaseHandler,
ConsoleHandler,
WriterHandler,
FileHandler
} from "./handlers.ts";
import { assert } from "../testing/asserts.ts";
export class LoggerConfig {
level?: string;
handlers?: string[];
}
export interface LogConfig {
handlers?: {
[name: string]: BaseHandler;
};
loggers?: {
[name: string]: LoggerConfig;
};
}
const DEFAULT_LEVEL = "INFO";
const DEFAULT_CONFIG: LogConfig = {
handlers: {
default: new ConsoleHandler(DEFAULT_LEVEL)
},
loggers: {
default: {
level: DEFAULT_LEVEL,
handlers: ["default"]
}
}
};
const state = {
handlers: new Map<string, BaseHandler>(),
loggers: new Map<string, Logger>(),
config: DEFAULT_CONFIG
};
export const handlers = {
BaseHandler,
ConsoleHandler,
WriterHandler,
FileHandler
};
export function getLogger(name?: string): Logger {
if (!name) {
const d = state.loggers.get("default");
assert(
d != null,
`"default" logger must be set for getting logger without name`
);
return d;
}
const result = state.loggers.get(name);
if (!result) {
const logger = new Logger("NOTSET", []);
state.loggers.set(name, logger);
return logger;
}
return result;
}
export const debug = (msg: string, ...args: unknown[]): void =>
getLogger("default").debug(msg, ...args);
export const info = (msg: string, ...args: unknown[]): void =>
getLogger("default").info(msg, ...args);
export const warning = (msg: string, ...args: unknown[]): void =>
getLogger("default").warning(msg, ...args);
export const error = (msg: string, ...args: unknown[]): void =>
getLogger("default").error(msg, ...args);
export const critical = (msg: string, ...args: unknown[]): void =>
getLogger("default").critical(msg, ...args);
export async function setup(config: LogConfig): Promise<void> {
state.config = {
handlers: { ...DEFAULT_CONFIG.handlers, ...config.handlers },
loggers: { ...DEFAULT_CONFIG.loggers, ...config.loggers }
};
// tear down existing handlers
state.handlers.forEach((handler): void => {
handler.destroy();
});
state.handlers.clear();
// setup handlers
const handlers = state.config.handlers || {};
for (const handlerName in handlers) {
const handler = handlers[handlerName];
await handler.setup();
state.handlers.set(handlerName, handler);
}
// remove existing loggers
state.loggers.clear();
// setup loggers
const loggers = state.config.loggers || {};
for (const loggerName in loggers) {
const loggerConfig = loggers[loggerName];
const handlerNames = loggerConfig.handlers || [];
const handlers: BaseHandler[] = [];
handlerNames.forEach((handlerName): void => {
const handler = state.handlers.get(handlerName);
if (handler) {
handlers.push(handler);
}
});
const levelName = loggerConfig.level || DEFAULT_LEVEL;
const logger = new Logger(levelName, handlers);
state.loggers.set(loggerName, logger);
}
}
setup(DEFAULT_CONFIG);
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