From eb426875e9cf7c99b299802c76dc6b1981eddaf0 Mon Sep 17 00:00:00 2001
From: Joao Moreno <jomo@microsoft.com>
Date: Wed, 6 Dec 2017 17:49:18 +0100
Subject: [PATCH] logging perf

fixes #39808
---
 src/vs/platform/log/node/spdlogService.ts | 54 ++++++++++++++---------
 1 file changed, 32 insertions(+), 22 deletions(-)

diff --git a/src/vs/platform/log/node/spdlogService.ts b/src/vs/platform/log/node/spdlogService.ts
index e7131d5ece6..06297000854 100644
--- a/src/vs/platform/log/node/spdlogService.ts
+++ b/src/vs/platform/log/node/spdlogService.ts
@@ -15,7 +15,7 @@ export function createLogService(processName: string, environmentService: IEnvir
 		setAsyncMode(8192, 2000);
 		const logfilePath = path.join(environmentService.logsPath, `${processName}.log`);
 		const logger = new RotatingLogger(processName, logfilePath, 1024 * 1024 * 5, 6);
-		return new SpdLogService(processName, logger, environmentService.logLevel);
+		return new SpdLogService(logger, environmentService.logLevel);
 	} catch (e) {
 		console.error(e);
 	}
@@ -27,7 +27,6 @@ class SpdLogService implements ILogService {
 	_serviceBrand: any;
 
 	constructor(
-		private name: string,
 		private readonly logger: RotatingLogger,
 		private level: LogLevel = LogLevel.Error
 	) {
@@ -41,59 +40,70 @@ class SpdLogService implements ILogService {
 		return this.level;
 	}
 
-	trace(message: string, ...args: any[]): void {
+	trace(): void {
 		if (this.level <= LogLevel.Trace) {
-			this.logger.trace(this.format(message, args));
+			this.logger.trace(this.format(arguments));
 		}
 	}
 
-	debug(message: string, ...args: any[]): void {
+	debug(): void {
 		if (this.level <= LogLevel.Debug) {
-			this.logger.debug(this.format(message, args));
+			this.logger.debug(this.format(arguments));
 		}
 	}
 
-	info(message: string, ...args: any[]): void {
+	info(): void {
 		if (this.level <= LogLevel.Info) {
-			this.logger.info(this.format(message, args));
+			this.logger.info(this.format(arguments));
 		}
 	}
 
-	warn(message: string, ...args: any[]): void {
+	warn(): void {
 		if (this.level <= LogLevel.Warning) {
-			this.logger.warn(this.format(message, args));
+			this.logger.warn(this.format(arguments));
 		}
 	}
 
-	error(arg: string | Error, ...args: any[]): void {
+	error(): void {
 		if (this.level <= LogLevel.Error) {
-			const message = arg instanceof Error ? arg.stack : arg;
-			this.logger.error(this.format(message, args));
+			const arg = arguments[0];
+
+			if (arg instanceof Error) {
+				const array = Array.prototype.slice.call(arguments) as any[];
+				array[0] = arg.stack;
+				this.logger.error(this.format(array));
+			} else {
+				this.logger.error(this.format(arguments));
+			}
 		}
 	}
 
-	critical(message: string, ...args: any[]): void {
+	critical(): void {
 		if (this.level <= LogLevel.Critical) {
-			this.logger.critical(this.format(message, args));
+			this.logger.critical(this.format(arguments));
 		}
 	}
 
 	dispose(): void {
-		this.info('Disposing logger service', this.name);
 		this.logger.flush();
 		this.logger.drop();
 	}
 
-	private format(value: string, args: any[] = []): string {
-		const strs = args.map(a => {
+	private format(args: any): string {
+		let result = '';
+
+		for (let i = 0; i < args.length; i++) {
+			let a = args[i];
+
 			if (typeof a === 'object') {
 				try {
-					return JSON.stringify(a);
+					a = JSON.stringify(a);
 				} catch (e) { }
 			}
-			return a;
-		});
 
-		return [value, ...strs].join(' ');
+			result += (i > 0 ? ' ' : '') + a;
+		}
+
+		return result;
 	}
 }
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