1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
/** * Logging library with the support for terminal and file outputs. Also provides * interfaces for building custom loggers. * * @module */
import { Logger } from "./logger.ts";import type { GenericFunction } from "./logger.ts";import {  BaseHandler,  ConsoleHandler,  FileHandler,  RotatingFileHandler,  WriterHandler,} from "./handlers.ts";import { assert } from "../_util/asserts.ts";import type { LevelName } from "./levels.ts";
export { LogLevels } from "./levels.ts";export type { LevelName } from "./levels.ts";export { Logger } from "./logger.ts";export type { LogRecord } from "./logger.ts";export type { FormatterFunction, HandlerOptions, LogMode } from "./handlers.ts";
export class LoggerConfig {  level?: LevelName;  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,  RotatingFileHandler,};
/** Get a logger instance. If not specified `name`, get the default logger.  */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(name, "NOTSET", { handlers: [] });    state.loggers.set(name, logger);    return logger;  }  return result;}
/** Log with debug level, using default logger. */export function debug<T>(msg: () => T, ...args: unknown[]): T | undefined;export function debug<T>(  msg: T extends GenericFunction ? never : T,  ...args: unknown[]): T;export function debug<T>(  msg: (T extends GenericFunction ? never : T) | (() => T),  ...args: unknown[]): T | undefined {  // Assist TS compiler with pass-through generic type  if (msg instanceof Function) {    return getLogger("default").debug(msg, ...args);  }  return getLogger("default").debug(msg, ...args);}
/** Log with info level, using default logger. */export function info<T>(msg: () => T, ...args: unknown[]): T | undefined;export function info<T>(  msg: T extends GenericFunction ? never : T,  ...args: unknown[]): T;export function info<T>(  msg: (T extends GenericFunction ? never : T) | (() => T),  ...args: unknown[]): T | undefined {  // Assist TS compiler with pass-through generic type  if (msg instanceof Function) {    return getLogger("default").info(msg, ...args);  }  return getLogger("default").info(msg, ...args);}
/** Log with warning level, using default logger. */export function warning<T>(msg: () => T, ...args: unknown[]): T | undefined;export function warning<T>(  msg: T extends GenericFunction ? never : T,  ...args: unknown[]): T;export function warning<T>(  msg: (T extends GenericFunction ? never : T) | (() => T),  ...args: unknown[]): T | undefined {  // Assist TS compiler with pass-through generic type  if (msg instanceof Function) {    return getLogger("default").warning(msg, ...args);  }  return getLogger("default").warning(msg, ...args);}
/** Log with error level, using default logger. */export function error<T>(msg: () => T, ...args: unknown[]): T | undefined;export function error<T>(  msg: T extends GenericFunction ? never : T,  ...args: unknown[]): T;export function error<T>(  msg: (T extends GenericFunction ? never : T) | (() => T),  ...args: unknown[]): T | undefined {  // Assist TS compiler with pass-through generic type  if (msg instanceof Function) {    return getLogger("default").error(msg, ...args);  }  return getLogger("default").error(msg, ...args);}
/** Log with critical level, using default logger. */export function critical<T>(msg: () => T, ...args: unknown[]): T | undefined;export function critical<T>(  msg: T extends GenericFunction ? never : T,  ...args: unknown[]): T;export function critical<T>(  msg: (T extends GenericFunction ? never : T) | (() => T),  ...args: unknown[]): T | undefined {  // Assist TS compiler with pass-through generic type  if (msg instanceof Function) {    return getLogger("default").critical(msg, ...args);  }  return getLogger("default").critical(msg, ...args);}
/** Setup logger config. */export function setup(config: LogConfig) {  state.config = {    handlers: { ...DEFAULT_CONFIG.handlers, ...config.handlers },    loggers: { ...DEFAULT_CONFIG.loggers, ...config.loggers },  };
  // tear down existing handlers  state.handlers.forEach((handler) => {    handler.destroy();  });  state.handlers.clear();
  // setup handlers  const handlers = state.config.handlers || {};
  for (const handlerName in handlers) {    const handler = handlers[handlerName];    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) => {      const handler = state.handlers.get(handlerName);      if (handler) {        handlers.push(handler);      }    });
    const levelName = loggerConfig.level || DEFAULT_LEVEL;    const logger = new Logger(loggerName, levelName, { handlers: handlers });    state.loggers.set(loggerName, logger);  }}
setup(DEFAULT_CONFIG);