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| import {
Env,
Log,
LogConfig,
LogLevel,
LogOptions,
Message,
MessageContext,
LOG_ENV,
} from '@btilford/ts-base-core';
import {Writable} from 'stream';
import util from 'util';
export type StdOutOptions = {
/**
* Will default to `process.stdout`
*/
stdout?: Writable;
/**
* Will default to `process.stderr`
*/
stderr?: Writable;
}
export type StdLogOptions = StdOutOptions & LogOptions & {
parent?: StdOutLog;
};
/**
* Log that writes to a `Writable`. By default `process.stdout` and `process.stderr` are used.
*
* When formatting the message by default `util.format` is used but you can set `LogConfig.messageFormat` to use something
* like `printj.sprintf` as well.
*
*/
export class StdOutLog extends Log {
protected readonly stdout: Writable;
protected readonly stderr: Writable;
protected constructor(
name: string,
config: LogConfig,
parent?: Log,
env?: Env,
stdout?: Writable,
stderr?: Writable,
) {
super(name, config, parent);
this.stdout = stdout || process.stdout;
this.stderr = stderr || process.stderr;
}
static create(options: StdLogOptions): StdOutLog {
return new StdOutLog(
options.name || '',
LogConfig.create(options.config),
options.parent,
options.env,
options.stdout,
options.stderr,
);
}
extend(name: string, config?: LogConfig): StdOutLog {
return new StdOutLog(name, config || this.config, this, this.env, this.stdout, this.stderr);
}
copy(name: string, config?: LogConfig): StdOutLog {
return new StdOutLog(name, config || this.config, undefined, this.env, this.stdout, this.stderr);
}
/**
* This will create a `Console` that prints the table to `this.stdout`.
* @param tabularData
* @param properties
*/
table(tabularData: any, properties: string[]): void {
if (this.enabled(LOG_ENV.table)) {
const tmp = new console.Console(this.stdout, this.stderr);
tmp.table(tabularData, properties);
}
}
/**
*
* @param level
* @param msg
* @param args
*/
protected createOutputString(level: LogLevel, msg: MessageContext, ...args: unknown[]): string {
let formatStr: string;
const context = new MessageContext(msg.message, {
...this.config.contextSupplier(),
name: this.name,
fqn: this.fqn,
level,
...msg.data,
args,
});
Eif (this.config.messageTemplate) {
formatStr = this.config.messageTemplate.format(context);
}
else {
formatStr = context.message;
}
Eif (this.config.interceptors) {
this.config.interceptors.forEach(interceptor => {
interceptor(new Message(level, context));
});
}
return this.config.messageFormat ?
this.config.messageFormat(formatStr, ...args) :
util.format(formatStr, ...args);
}
protected _write(level: LogLevel, message: MessageContext, ...args: unknown[]): void | Error {
try {
const output = this.createOutputString(level, message, ...args);
if (level.gte(LogLevel.WARN)) {
this.stderr.write(output);
}
else {
this.stdout.write(output);
}
}
catch (error) {
console.error('Error writing message', message);
return error;
}
}
}
|