Class RazorLogObserver

src/lsptoolshost/logging/loggingUtils.ts:507–542

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

    constructor(logger: RazorLogger) {
        this._subscription = logger.onLog((message) => {
            this._messages.push({ message, timestamp: new Date() });
        });
    }

    /**
     * Returns the collected messages as a formatted string suitable for a log file.
     */
    public getLog(): string {
        return RazorLogObserver.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: Message[]): string {
        return messages
            .map((msg) => {
                const timestamp = msg.timestamp.toISOString();
                return `[${timestamp}] ${msg.message}`;
            })
            .join('\n');
    }
}

/**
 * Creates an activity log capture that collects logs from the C#, LSP trace, and Razor channels.