TypeScript performance-now类代码示例

    function resolveN(container: Container, times: number) {

        const result = {
            avg: -1,
            max: -1,
            min: 9999999999999999
        };

        const items: number[] = [];
        let i = 0;

        for (i = 0; i < times; i++) {

            const start = now();
            container.get(`SOME_ID_${times}`);
            const end = now();
            const total = end - start;

            if (total < result.min) {
                result.min = total;
            }
            if (total > result.max) {
                result.max = total;
            }

            items.push(total);
        }

        result.avg = items.reduce((p, c) => p + c, 0) / items.length;

        return result;
    }

    // Installs the test platform from a network share path provided by the user. The path should point to a .nupkg file.
    public async installVsTestPlatformToolFromNetworkShare(netSharePath: string) {
        let vstestPlatformInstalledLocation;
        let packageSource;

        // Remove all double quotes from the path.
        netSharePath = netSharePath.replace(/["]+/g, '');

        tl.debug(`Attempting to fetch the vstest platform from the specified network share path ${netSharePath}.`);

        if (helpers.pathExistsAsFile(netSharePath)) {
            packageSource = path.dirname(netSharePath);
        } else {
            ci.addToConsolidatedCi('failureReason', constants.packageFileDoesNotExist);
            throw new Error(tl.loc('SpecifiedFileDoesNotExist', netSharePath));
        }

        const fileName = path.basename(netSharePath);
        const versionExtractionRegex = constants.versionExtractionRegex;
        const regexMatches = versionExtractionRegex.exec(fileName);

        if (!regexMatches || regexMatches.length !== 2) {
            ci.addToConsolidatedCi('failureReason', constants.unexpectedPackageFileName);
            throw new Error(tl.loc('UnexpectedFileName', fileName));
        }
        const testPlatformVersion = regexMatches[1];
        ci.addToConsolidatedCi('testPlatformVersion', testPlatformVersion);

        // If the version provided is not an explicit version (ie contains containing wildcards) then throw
        if (!toolLib.isExplicitVersion(testPlatformVersion)) {
            ci.publishEvent('InvalidVersionSpecified', { version: testPlatformVersion } );
            ci.addToConsolidatedCi('failureReason', constants.notExplicitVersion);
            throw new Error(tl.loc('ProvideExplicitVersion', testPlatformVersion));
        }

        console.log(tl.loc('ParsedVersion', testPlatformVersion));
        tl.debug(`Looking for version ${testPlatformVersion} in the tools cache.`);
        startTime = perf();

        // Check cache for the specified version
        vstestPlatformInstalledLocation = toolLib.findLocalTool(constants.toolFolderName, testPlatformVersion);

        ci.addToConsolidatedCi('cacheLookupTime', perf() - startTime);

        // If found in the cache then set the tool location and return
        if (!helpers.isNullEmptyOrUndefined(vstestPlatformInstalledLocation)) {
            ci.addToConsolidatedCi('firstCacheLookupSucceeded', 'true');
            helpers.setVsTestToolLocation(vstestPlatformInstalledLocation);
            return;
        }

        ci.addToConsolidatedCi('firstCacheLookupSucceeded', 'false');

        vstestPlatformInstalledLocation = await new NugetDownloadHelper()
            .attemptPackageDownload(packageSource, testPlatformVersion, null);

        // Set the vstest platform tool location for the vstest task to consume
        helpers.setVsTestToolLocation(vstestPlatformInstalledLocation);
    }

    // Downloads and caches the test platform package
    private async acquireAndCacheVsTestPlatformNuget(packageSource: string, testPlatformVersion: string, nugetConfigFilePath: string): Promise<string> {
        testPlatformVersion = toolLib.cleanVersion(testPlatformVersion);
        const nugetTool = tl.tool(path.join(__dirname, 'nuget.exe'));
        let downloadPath = helpers.getTempFolder();

        // Ensure Agent.TempDirectory is set
        if (!downloadPath) {
            throw new Error(tl.loc('ExpectedTempToBeSet'));
        }

        // Call out a warning if the agent work folder path is longer than 50 characters as anything longer may cause the download to fail
        // Note: This upper limit was calculated for a particular test platform package version and is subject to change
        if (tl.getVariable(constants.agentWorkFolder) && tl.getVariable(constants.agentWorkFolder).length > 50) {
            ci.addToConsolidatedCi('agentWorkDirectoryPathTooLong', 'true');
            tl.warning(tl.loc('AgentWorkDirectoryPathTooLong'));
        }

        // Use as short a path as possible due to nested folders in the package that may potentially exceed the 255 char windows path limit
        downloadPath = path.join(downloadPath, constants.toolFolderName);
        nugetTool.arg(constants.install).arg(constants.packageId).arg(constants.version).arg(testPlatformVersion).arg(constants.source)
            .arg(packageSource).arg(constants.outputDirectory).arg(downloadPath).arg(constants.noCache).arg(constants.directDownload)
            .argIf(nugetConfigFilePath, constants.configFile).argIf(nugetConfigFilePath, nugetConfigFilePath).arg(constants.noninteractive);

        tl.debug(`Downloading Test Platform version ${testPlatformVersion} from ${packageSource} to ${downloadPath}.`);
        startTime = perf();
        const resultCode = await nugetTool.exec();
        ci.addToConsolidatedCi('downloadTime', perf() - startTime);

        tl.debug(`Nuget.exe returned with result code ${resultCode}`);

        if (resultCode !== 0) {
            tl.error(tl.loc('NugetErrorCode', resultCode));
            throw new Error(tl.loc('DownloadFailed', resultCode));
        }

        // Install into the local tool cache
        const toolRoot = path.join(downloadPath, constants.packageId + '.' + testPlatformVersion);

        tl.debug(`Caching the downloaded folder ${toolRoot}.`);
        startTime = perf();
        const vstestPlatformInstalledLocation = await toolLib.cacheDir(toolRoot, constants.toolFolderName, testPlatformVersion);
        ci.addToConsolidatedCi('cacheTime', perf() - startTime);

        return vstestPlatformInstalledLocation;
    }

    function registerN(times: number) {

        const result = {
            container: new Container(),
            register: -1
        };

        let i = 0;

        for (i = 0; i < times; i++) {
            const start = now();
            result.container.bind<any>(`SOME_ID_${i}`).toConstantValue({ test: i });
            const end = now();
            result.register = end - start;
        }

        return result;
    }

    // Attemps to download the package and on failure looks for the latest stable version already present in the cache
    public async attemptPackageDownload(packageSource: string, testPlatformVersion: string, nugetConfigFilePath: string) : Promise<string> {
        let vstestPlatformInstalledLocation;
        try {
            tl.debug(`Could not find ${constants.packageId}.${testPlatformVersion} in the tools cache. Fetching it from nuget.`);

            // Download the required version and cache it
            vstestPlatformInstalledLocation = await this.acquireAndCacheVsTestPlatformNuget(packageSource,
                testPlatformVersion, nugetConfigFilePath);

        } catch (error) {
            tl.error(tl.loc('TestPlatformDownloadFailed', testPlatformVersion, error));

            if ((tl.getInput(constants.packageFeedSelector) === constants.nugetOrg || tl.getInput(constants.packageFeedSelector) === constants.customFeed)
                && tl.getInput(constants.versionSelector) === constants.specificVersion) {
                return null;
            }

            console.log(tl.loc('LatestStableCached'));
            testPlatformVersion = 'x';

            ci.addToConsolidatedCi('downloadSucceeded', 'false');
            ci.publishEvent('DownloadFailed', { action: 'getLatestAvailableInCache', error: error } );
            startTime = perf();

            // Download failed, look for the latest version available in the cache
            vstestPlatformInstalledLocation = toolLib.findLocalTool(constants.toolFolderName, testPlatformVersion);

            ci.addToConsolidatedCi('secondCacheLookupTime', perf() - startTime);

            // No version found in cache, fail the task
            if (!vstestPlatformInstalledLocation || vstestPlatformInstalledLocation === 'undefined') {
                ci.addToConsolidatedCi('secondCacheLookupSucceeded', 'false');
                ci.addToConsolidatedCi('failureReason', constants.downloadFailed);
                tl.error(tl.loc('NoPackageFoundInCache'));
                throw new Error(tl.loc('FailedToAcquireTestPlatform'));
            }

            ci.addToConsolidatedCi('secondCacheLookupSucceeded', 'true');
        }

        return vstestPlatformInstalledLocation;
    }

    // Lists the latest version of the package available in the feed specified.
    public getLatestPackageVersionNumber(packageSource: string, includePreRelease: boolean, nugetConfigFilePath: string): string {
        const nugetTool = tl.tool(path.join(__dirname, 'nuget.exe'));

        ci.addToConsolidatedCi('includePreRelease', `${includePreRelease}`);

        // Only search by package id if the feed is the offial nuget feed, otherwise search by package name as not all feeds
        // support searching by package id
        nugetTool.arg(constants.list)
            .argIf(packageSource === constants.defaultPackageSource , `packageid:${constants.packageId}`)
            .argIf(packageSource !== constants.defaultPackageSource , `${constants.packageId}`)
            .argIf(includePreRelease, constants.preRelease)
            .arg(constants.noninteractive).arg(constants.source).arg(packageSource)
            .argIf(nugetConfigFilePath, constants.configFile)
            .argIf(nugetConfigFilePath, nugetConfigFilePath);

        startTime = perf();
        const result = nugetTool.execSync();

        ci.addToConsolidatedCi('ListLatestPackageTime', perf() - startTime);

        if (result.code !== 0 || !(result.stderr === null || result.stderr === undefined || result.stderr === '')) {
            tl.error(tl.loc('NugetErrorCode', result.code));
            ci.addToConsolidatedCi('listingPackagesFailed', 'true');
            throw new Error(tl.loc('ListPackagesFailed', result.code, result.stderr, result.stdout));
        }

        const listOfPackages = result.stdout.split('\r\n');
        let version: string;

        // parse the version number from the output string
        listOfPackages.forEach(nugetPackage => {
            if (nugetPackage.split(' ')[0] === constants.packageId) {
                version = nugetPackage.split(' ')[1];
                return;
            }
        });

        return version;
    }

    // Utility function that writes the feed url along with username and password if provided into the specified nuget config file
    private prepareNugetConfigFile(packageSource: string, configFilePath: string, username: string, password: string, feedId: string) {
        const feedUrl = tl.getInput(constants.customFeed);

        tl.debug(`Writing package source details to temp config file ${configFilePath}`);

        try {
            // Write the skeleton nuget config contents to the config file
            fs.writeFileSync(configFilePath, constants.emptyNugetConfig, { encoding: 'utf-8' });
        } catch (error) {
            ci.addToConsolidatedCi('failureReason', 'configFileWriteFailed');
            throw new Error(tl.loc('ConfigFileWriteFailed', configFilePath, error));
        }

        if (!helpers.isNullEmptyOrUndefined(password) && helpers.isNullEmptyOrUndefined(username)) {
            username = constants.defaultUsername;
        }

        const nugetTool = tl.tool(path.join(__dirname, 'nuget.exe'));

        nugetTool.arg(constants.sources).arg(constants.add).arg(constants.noninteractive)
            .arg(constants.name).arg(feedId).arg(constants.source).arg(feedUrl)
            .arg(constants.validAuthenticationTypes).arg(constants.basic)
            .argIf(password, constants.usernameParam).argIf(password, username)
            .argIf(password, constants.passwordParam).argIf(password, password)
            .argIf(configFilePath, constants.configFile).argIf(configFilePath, configFilePath);

        startTime = perf();
        const result = nugetTool.execSync();
        ci.addToConsolidatedCi('prepareConfigFileTime', perf() - startTime);

        if (result.code !== 0 || !(result.stderr === null || result.stderr === undefined || result.stderr === '')) {
            ci.addToConsolidatedCi('failureReason', constants.configFileWriteFailed);
            throw new Error(tl.loc('ConfigFileWriteFailed', configFilePath, result.stderr));
        }

        // Assign the feed name we wrote into the config file to the packageSource variable
        tl.debug(`Setting the source to feed with id ${feedId} whose details were written to the config file.`);
        ci.publishEvent('PackageSourceOverridden', {packageSource: 'customFeed'} );
    }

  function processEvent() {
    if (paused) {
      return;
    }

    const time = now();
    setTime(time);

    if (scheduler.isEmpty()) {
      return;
    }

    let nextEventTime = scheduler.peek().time;

    while (nextEventTime < time) {
      const eventToProcess = scheduler.shiftNextEntry();

      if (!eventToProcess.cancelled) {
        if (eventToProcess.f) {
          eventToProcess.f(eventToProcess, time, scheduler.add, currentTime);
        }

        if (eventToProcess.type === 'next') {
          eventToProcess.stream.shamefullySendNext(eventToProcess.value);
        } else if (eventToProcess.type === 'complete') {
          eventToProcess.stream.shamefullySendComplete();
        } else if (eventToProcess.type === 'error') {
          eventToProcess.stream.shamefullySendError(eventToProcess.error);
        } else {
          throw new Error('Unhandled event type: ' + eventToProcess.type);
        }
      }

      nextEventTime = (scheduler.peek() && scheduler.peek().time) || Infinity;
    }
  }

}).catch(() => {
    ci.addToConsolidatedCi('executionTime', perf() - startTime);
    ci.fireConsolidatedCi();
});

            case 'customfeed':
                tl.debug('Going via custom feed download flow.');
                await new NugetFeedInstaller()
                    .installVsTestPlatformToolFromCustomFeed(packageSource, versionSelectorInput, testPlatformVersion, username, password);
            break;

            case 'netshare':
                tl.debug('Going via net share copy flow.');
                await new NetworkShareInstaller().installVsTestPlatformToolFromNetworkShare(networkSharePath);
                break;
        }

    } catch (error) {
        ci.publishEvent('Completed', { isSetupSuccessful: 'false' } );
        tl.setResult(tl.TaskResult.Failed, error);
        return;
    }

    ci.addToConsolidatedCi('result', constants.installationStatusSucceeded);
}

// Execution start
tl.setResourcePath(path.join(__dirname, 'task.json'));
startTime = perf();
startInstaller().then(() => {
    ci.addToConsolidatedCi('executionTime', perf() - startTime);
    ci.fireConsolidatedCi();
}).catch(() => {
    ci.addToConsolidatedCi('executionTime', perf() - startTime);
    ci.fireConsolidatedCi();
});