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import {
isDebug,
type ITrace,
type ITraceWith,
type SideEffect,
type Supplier,
} from "@emprespresso/pengueno";
export interface ILogger {
log: (...args: unknown[]) => void;
debug: (...args: unknown[]) => void;
warn: (...args: unknown[]) => void;
error: (...args: unknown[]) => void;
}
export enum LogLevel {
UNKNOWN = "UNKNOWN",
INFO = "INFO",
WARN = "WARN",
DEBUG = "DEBUG",
ERROR = "ERROR",
}
const logLevelOrder: Array<LogLevel> = [
LogLevel.DEBUG,
LogLevel.INFO,
LogLevel.WARN,
LogLevel.ERROR,
];
export const isLogLevel = (l: string): l is LogLevel =>
logLevelOrder.some((level) => <string> level === l);
const defaultAllowedLevels = () =>
[
LogLevel.UNKNOWN,
...(isDebug() ? [LogLevel.DEBUG] : []),
LogLevel.INFO,
LogLevel.WARN,
LogLevel.ERROR,
] as Array<LogLevel>;
export const logWithLevel = (
logger: ILogger,
level: LogLevel,
): SideEffect<unknown> => {
switch (level) {
case LogLevel.UNKNOWN:
case LogLevel.INFO:
return logger.log;
case LogLevel.DEBUG:
return logger.debug;
case LogLevel.WARN:
return logger.warn;
case LogLevel.ERROR:
return logger.error;
}
};
export type LogTraceSupplier = ITraceWith<Supplier<string>>;
const defaultTrace = () => `[${new Date().toISOString()}]`;
export const LoggerImpl = console;
export class LogTrace implements ITrace<LogTraceSupplier> {
constructor(
private readonly logger: ILogger = LoggerImpl,
private readonly traces: Array<LogTraceSupplier> = [defaultTrace],
private readonly allowedLevels: Supplier<Array<LogLevel>> =
defaultAllowedLevels,
private readonly defaultLevel: LogLevel = LogLevel.INFO,
) {
}
public addTrace(trace: LogTraceSupplier): ITrace<LogTraceSupplier> {
return new LogTrace(
this.logger,
this.traces.concat(trace),
this.allowedLevels,
this.defaultLevel,
);
}
public trace(trace: LogTraceSupplier) {
const { line, level: _level } = this.foldTraces(this.traces.concat(trace));
if (!this.allowedLevels().includes(_level)) return;
const level = _level === LogLevel.UNKNOWN ? this.defaultLevel : _level;
logWithLevel(this.logger, level)(`[${level}]${line}`);
}
private foldTraces(traces: Array<LogTraceSupplier>) {
const { line, level } = traces.reduce(
(acc: { line: string; level: number }, t) => {
const val = typeof t === "function" ? t() : t;
if (isLogLevel(val)) {
return {
...acc,
level: Math.max(logLevelOrder.indexOf(val), acc.level),
};
}
const prefix = [
acc.line,
val,
].join(" ");
return { ...acc, prefix };
},
{ line: "", level: -1 },
);
return { line, level: logLevelOrder[level] ?? LogLevel.UNKNOWN };
}
}
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