| import type { ITelemetryAppender, TelemetryAppenderRecord } from './telemetry'; |
| import type { TelemetryProperties } from './context'; |
|
|
| export interface ConsoleAppenderOptions { |
| readonly prefix?: string; |
| readonly pretty?: boolean; |
| readonly log?: (message: string) => void; |
| } |
|
|
| const DEFAULT_PREFIX = '[telemetry]'; |
|
|
| export class ConsoleAppender implements ITelemetryAppender { |
| private readonly prefix: string; |
| private readonly pretty: boolean; |
| private readonly log: (message: string) => void; |
|
|
| constructor(options: ConsoleAppenderOptions = {}) { |
| this.prefix = options.prefix ?? DEFAULT_PREFIX; |
| this.pretty = options.pretty ?? false; |
| this.log = options.log ?? defaultLog; |
| } |
|
|
| track(record: TelemetryAppenderRecord): void { |
| const payload = |
| Object.keys(record.properties).length === 0 |
| ? '' |
| : ` ${stringifyProperties(record.properties, this.pretty)}`; |
| this.log(`${this.prefix} ${record.event}${payload}`); |
| } |
| } |
|
|
| function stringifyProperties(properties: TelemetryProperties, pretty: boolean): string { |
| if (pretty) { |
| return JSON.stringify(properties, null, 2); |
| } |
| return JSON.stringify(properties); |
| } |
|
|
| function defaultLog(message: string): void { |
| console.log(message); |
| } |
|
|
