private initLaunchAttachRequest()

in src/debugAdapter/goDebug.ts [1963:2098]
60 lines of code
22 McCabe index (conditional complexity)

	private initLaunchAttachRequest(
		response: DebugProtocol.LaunchResponse,
		args: LaunchRequestArguments | AttachRequestArguments
	) {
		this.logLevel =
			args.trace === 'verbose' || args.trace === 'trace'
				? Logger.LogLevel.Verbose
				: args.trace === 'log' || args.trace === 'info' || args.trace === 'warn'
				? Logger.LogLevel.Log
				: Logger.LogLevel.Error;
		const logPath =
			this.logLevel !== Logger.LogLevel.Error ? path.join(os.tmpdir(), 'vscode-go-debug.txt') : undefined;
		logger.setup(this.logLevel, logPath);

		if (typeof args.showGlobalVariables === 'boolean') {
			this.showGlobalVariables = args.showGlobalVariables;
		}
		if (args.stopOnEntry) {
			this.stopOnEntry = args.stopOnEntry;
		}
		if (!args.port) {
			args.port = random(2000, 50000);
		}
		if (!args.host) {
			args.host = '127.0.0.1';
		}

		let localPath: string;
		if (args.request === 'attach') {
			localPath = args.cwd;
		} else if (args.request === 'launch') {
			localPath = args.program;
		}
		if (!args.remotePath) {
			// too much code relies on remotePath never being null
			args.remotePath = '';
		}

		this.localPathSeparator = findPathSeparator(localPath);
		this.substitutePath = [];
		if (args.remotePath.length > 0) {
			this.remotePathSeparator = findPathSeparator(args.remotePath);

			const llist = localPath.split(/\/|\\/).reverse();
			const rlist = args.remotePath.split(/\/|\\/).reverse();
			let i = 0;
			for (; i < llist.length; i++) {
				if (llist[i] !== rlist[i] || llist[i] === 'src') {
					break;
				}
			}

			if (i) {
				localPath = llist.reverse().slice(0, -i).join(this.localPathSeparator) + this.localPathSeparator;
				args.remotePath =
					rlist.reverse().slice(0, -i).join(this.remotePathSeparator) + this.remotePathSeparator;
			} else if (
				args.remotePath.length > 1 &&
				(args.remotePath.endsWith('\\') || args.remotePath.endsWith('/'))
			) {
				args.remotePath = args.remotePath.substring(0, args.remotePath.length - 1);
			}

			// Make the remotePath mapping the first one in substitutePath
			// so that it will take precedence over the other mappings.
			this.substitutePath.push({
				from: normalizeSeparators(localPath),
				to: normalizeSeparators(args.remotePath)
			});
		}

		if (args.substitutePath) {
			args.substitutePath.forEach((value) => {
				if (!this.remotePathSeparator) {
					this.remotePathSeparator = findPathSeparator(value.to);
				}
				this.substitutePath.push({
					from: normalizeSeparators(value.from),
					to: normalizeSeparators(value.to)
				});
			});
		}

		// Launch the Delve debugger on the program
		this.delve = new Delve(args, localPath);
		this.delve.onstdout = (str: string) => {
			this.sendEvent(new OutputEvent(str, 'stdout'));
		};
		this.delve.onstderr = (str: string) => {
			if (localPath.length > 0) {
				str = expandFilePathInOutput(str, localPath);
			}
			this.sendEvent(new OutputEvent(str, 'stderr'));
		};
		this.delve.onclose = (code) => {
			if (code !== 0) {
				this.sendErrorResponse(response, 3000, 'Failed to continue: Check the debug console for details.');
			}
			log('Sending TerminatedEvent as delve is closed');
			this.sendEvent(new TerminatedEvent());
		};

		this.delve.connection.then(
			() => {
				if (!this.delve.noDebug) {
					this.delve.call<GetVersionOut>('GetVersion', [], (err, out) => {
						if (err) {
							logError(err);
							return this.sendErrorResponse(
								response,
								2001,
								'Failed to get remote server version: "{e}"',
								{ e: err.toString() }
							);
						}
						const clientVersion = this.delve.isApiV1 ? 1 : 2;
						if (out.APIVersion !== clientVersion) {
							const errorMessage = `The remote server is running on delve v${out.APIVersion} API and the client is running v${clientVersion} API. Change the version used on the client by using the property "apiVersion" in your launch.json file.`;
							logError(errorMessage);
							return this.sendErrorResponse(response, 3000, errorMessage);
						}
					});

					this.sendEvent(new InitializedEvent());
					log('InitializeEvent');
				}
				this.sendResponse(response);
			},
			(err) => {
				this.sendErrorResponse(response, 3000, 'Failed to continue: "{e}"', {
					e: err.toString()
				});
				log('ContinueResponse');
			}
		);
	}