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logging.ts
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import chalk from 'chalk'
import * as fs from 'fs'
import { inspect } from 'util'
import { MessageType } from 'vscode-languageserver'
import { LanguageClient } from './lang-handler'
export interface Logger {
log(...values: any[]): void
info(...values: any[]): void
warn(...values: any[]): void
error(...values: any[]): void
}
/**
* Formats values to a message by pretty-printing objects
*/
function format(values: any[]): string {
return values.map(value => (typeof value === 'string' ? value : inspect(value, { depth: Infinity }))).join(' ')
}
/**
* A logger implementation that sends window/logMessage notifications to an LSP client
*/
export class LSPLogger implements Logger {
/**
* @param client The client to send window/logMessage notifications to
*/
constructor(private client: LanguageClient) {}
public log(...values: any[]): void {
try {
this.client.windowLogMessage({ type: MessageType.Log, message: format(values) })
} catch (err) {
// ignore
}
}
public info(...values: any[]): void {
try {
this.client.windowLogMessage({ type: MessageType.Info, message: format(values) })
} catch (err) {
// ignore
}
}
public warn(...values: any[]): void {
try {
this.client.windowLogMessage({ type: MessageType.Warning, message: format(values) })
} catch (err) {
// ignore
}
}
public error(...values: any[]): void {
try {
this.client.windowLogMessage({ type: MessageType.Error, message: format(values) })
} catch (err) {
// ignore
}
}
}
/**
* Logging implementation that writes to an arbitrary NodeJS stream
*/
export class StreamLogger {
constructor(private outStream: NodeJS.WritableStream, private errStream: NodeJS.WritableStream) {}
public log(...values: any[]): void {
try {
this.outStream.write(chalk.grey('DEBUG ' + format(values) + '\n'))
} catch (err) {
// ignore
}
}
public info(...values: any[]): void {
try {
this.outStream.write(chalk.bgCyan('INFO') + ' ' + format(values) + '\n')
} catch (err) {
// ignore
}
}
public warn(...values: any[]): void {
try {
this.errStream.write(chalk.bgYellow('WARN') + ' ' + format(values) + '\n')
} catch (err) {
// ignore
}
}
public error(...values: any[]): void {
try {
this.errStream.write(chalk.bgRed('ERROR') + ' ' + format(values) + '\n')
} catch (err) {
// ignore
}
}
}
/**
* Logger implementation that logs to STDOUT and STDERR depending on level
*/
export class StdioLogger extends StreamLogger {
constructor() {
super(process.stdout, process.stderr)
}
}
/**
* Logger implementation that logs only to STDERR
*/
export class StderrLogger extends StreamLogger {
constructor() {
super(process.stderr, process.stderr)
}
}
/**
* Logger implementation that logs to a file
*/
export class FileLogger extends StreamLogger {
/**
* @param file Path to the logfile
*/
constructor(file: string) {
const stream = fs.createWriteStream(file)
super(stream, stream)
}
}
/**
* Logger implementation that wraps another logger and prefixes every message with a given prefix
*/
export class PrefixedLogger {
constructor(private logger: Logger, private prefix: string) {}
public log(...values: any[]): void {
this.logger.log(`[${this.prefix}] ${format(values)}`)
}
public info(...values: any[]): void {
this.logger.info(`[${this.prefix}] ${format(values)}`)
}
public warn(...values: any[]): void {
this.logger.warn(`[${this.prefix}] ${format(values)}`)
}
public error(...values: any[]): void {
this.logger.error(`[${this.prefix}] ${format(values)}`)
}
}
/**
* Logger implementation that does nothing
*/
export class NoopLogger {
public log(...values: any[]): void {
// empty
}
public info(...values: any[]): void {
// empty
}
public warn(...values: any[]): void {
// empty
}
public error(...values: any[]): void {
// empty
}
}