Class LogObserver

src/lsptoolshost/logging/observableLogOutputChannel.ts:169–205

 * Observes log messages from an ObservableLogOutputChannel and collects them until disposed.
 */
export class LogObserver {
    private readonly _messages: LogMessage[] = [];
    private readonly _subscription: vscode.Disposable;

    constructor(channel: ObservableLogOutputChannel) {
        this._subscription = channel.onMessageLogged((message) => {
            this._messages.push(message);
        });
    }

    /**
     * Returns the collected messages as a formatted string suitable for a log file.
     */
    public getLog(): string {
        return LogObserver.formatLogMessages(this._messages);
    }

    /**
     * Disposes the subscription and stops observing log messages.
     */
    public dispose(): void {
        this._subscription.dispose();
    }

    /**
     * Formats an array of log messages into a string suitable for a log file.
     */
    public static formatLogMessages(messages: LogMessage[]): string {
        return messages
            .map((msg) => {
                const timestamp = msg.timestamp.toISOString();
                const level = msg.level.toUpperCase().padEnd(5);
                return `[${timestamp}] [${level}] ${msg.message}`;
            })
            .join('\n');
    }
}