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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
/** Get log level numeric values through enum constants
*/
export enum LogLevels {
NOTSET = 0,
DEBUG = 10,
INFO = 20,
WARNING = 30,
ERROR = 40,
CRITICAL = 50,
}
/** Permitted log level names */
export const LogLevelNames = Object.keys(LogLevels).filter((key) =>
isNaN(Number(key))
);
/** Union of valid log level strings */
export type LevelName = keyof typeof LogLevels;
const byLevel: Record<string, LevelName> = {
[String(LogLevels.NOTSET)]: "NOTSET",
[String(LogLevels.DEBUG)]: "DEBUG",
[String(LogLevels.INFO)]: "INFO",
[String(LogLevels.WARNING)]: "WARNING",
[String(LogLevels.ERROR)]: "ERROR",
[String(LogLevels.CRITICAL)]: "CRITICAL",
};
/** Returns the numeric log level associated with the passed,
* stringy log level name.
*/
export function getLevelByName(name: LevelName): number {
switch (name) {
case "NOTSET":
return LogLevels.NOTSET;
case "DEBUG":
return LogLevels.DEBUG;
case "INFO":
return LogLevels.INFO;
case "WARNING":
return LogLevels.WARNING;
case "ERROR":
return LogLevels.ERROR;
case "CRITICAL":
return LogLevels.CRITICAL;
default:
throw new Error(`no log level found for "${name}"`);
}
}
/** Returns the stringy log level name provided the numeric log level */
export function getLevelName(level: number): LevelName {
const levelName = byLevel[level];
if (levelName) {
return levelName;
}
throw new Error(`no level name found for level: ${level}`);
}
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