# 运行时版本更新


您可以使用 CloudWatch 控制台、Amazon CloudFormation、Amazon CLI 或 Amazon SDK 更新金丝雀的运行时版本。当使用 CloudWatch 控制台更新时，您可以一次最多更新五个金丝雀，方法是在金丝雀列表页面中选中它们，然后选择 **Actions（操作）**、**Update Runtime（更新运行时）**。

在提交运行时更新之前，您可以先测试更新来验证其有效性。更新运行时版本时，请在 CloudWatch 控制台中选择**开始试运行**或**验证并稍后保存**选项，对原始金丝雀及其配置变更进行试运行测试。试运行会更新并执行金丝雀，验证运行时更新对金丝雀是否安全。在使用新的运行时版本验证金丝雀能正常工作后，您便可以更新金丝雀的运行时版本。有关更多信息，请参阅 [执行安全金丝雀更新](performing-safe-canary-upgrades.md)。

您也可以先使用 CloudWatch 控制台克隆金丝雀，然后更新其运行时版本，以此验证更新是否安全。这会再创建一个金丝雀，其是原始金丝雀的克隆。在使用新的运行时版本验证了金丝雀后，您便可以更新原始金丝雀的运行时版本并删除克隆金丝雀。

 您还可以使用升级脚本更新多个金丝雀。有关更多信息，请参阅 [金丝雀运行时升级脚本](#CloudWatch_Synthetics_Canaries_upgrade_script)。

如果升级金丝雀失败，请参阅 [排查失败金丝雀的问题](CloudWatch_Synthetics_Canaries_Troubleshoot.md)。

## 金丝雀运行时升级脚本


若要将金丝雀脚本升级到支持的运行时版本，请使用以下脚本。

```
const Amazon = require('aws-sdk');

// You need to configure your Amazon credentials and Region.
//   https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/setting-credentials-node.html
//   https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/setting-region.html

const synthetics = new AWS.Synthetics();

const DEFAULT_OPTIONS = {
  /**
   * The number of canaries to upgrade during a single run of this script.
   */
  count: 10,
  /**
   * No canaries are upgraded unless force is specified.
   */
  force: false
};

/**
 * The number of milliseconds to sleep between GetCanary calls when
 * verifying that an update succeeded.
 */
const SLEEP_TIME = 5000;

(async () => {
  try {
    const options = getOptions();

    const versions = await getRuntimeVersions();
    const canaries = await getAllCanaries();
    const upgrades = canaries
      .filter(canary => !versions.isLatestVersion(canary.RuntimeVersion))
      .map(canary => {
        return {
          Name: canary.Name,
          FromVersion: canary.RuntimeVersion,
          ToVersion: versions.getLatestVersion(canary.RuntimeVersion)
        };
      });

    if (options.force) {
      const promises = [];

      for (const upgrade of upgrades.slice(0, options.count)) {
        const promise = upgradeCanary(upgrade);
        promises.push(promise);
        // Sleep for 100 milliseconds to avoid throttling.
        await usleep(100);
      }

      const succeeded = [];
      const failed = [];
      for (let i = 0; i < upgrades.slice(0, options.count).length; i++) {
        const upgrade = upgrades[i];
        const promise = promises[i];
        try {
          await promise;
          console.log(`The update of ${upgrade.Name} succeeded.`);
          succeeded.push(upgrade.Name);
        } catch (e) {
          console.log(`The update of ${upgrade.Name} failed with error: ${e}`);
          failed.push({
            Name: upgrade.Name,
            Reason: e
          });
        }
      }

      if (succeeded.length) {
        console.group('The following canaries were upgraded successfully.');
        for (const name of succeeded) {
          console.log(name);
        }
        console.groupEnd()
      } else {
        console.log('No canaries were upgraded successfully.');
      }

      if (failed.length) {
        console.group('The following canaries were not upgraded successfully.');
        for (const failure of failed) {
          console.log('\x1b[31m', `${failure.Name}: ${failure.Reason}`, '\x1b[0m');
        }
        console.groupEnd();
      }
    } else {
      console.log('Run with --force [--count <count>] to perform the first <count> upgrades shown. The default value of <count> is 10.')
      console.table(upgrades);
    }
  } catch (e) {
    console.error(e);
  }
})();

function getOptions() {
  const force = getFlag('--force', DEFAULT_OPTIONS.force);
  const count = getOption('--count', DEFAULT_OPTIONS.count);
  return { force, count };

  function getFlag(key, defaultValue) {
    return process.argv.includes(key) || defaultValue;
  }
  function getOption(key, defaultValue) {
    const index = process.argv.indexOf(key);
    if (index < 0) {
      return defaultValue;
    }
    const value = process.argv[index + 1];
    if (typeof value === 'undefined' || value.startsWith('-')) {
      throw `The ${key} option requires a value.`;
    }
    return value;
  }
}

function getAllCanaries() {
  return new Promise((resolve, reject) => {
    const canaries = [];

    synthetics.describeCanaries().eachPage((err, data) => {
      if (err) {
        reject(err);
      } else {
        if (data === null) {
          resolve(canaries);
        } else {
          canaries.push(...data.Canaries);
        }
      }
    });
  });
}

function getRuntimeVersions() {
  return new Promise((resolve, reject) => {
    const jsVersions = [];
    const pythonVersions = [];
    synthetics.describeRuntimeVersions().eachPage((err, data) => {
      if (err) {
        reject(err);
      } else {
        if (data === null) {
          jsVersions.sort((a, b) => a.ReleaseDate - b.ReleaseDate);
          pythonVersions.sort((a, b) => a.ReleaseDate - b.ReleaseDate);
          resolve({
            isLatestVersion(version) {
              const latest = this.getLatestVersion(version);
              return latest === version;
            },
            getLatestVersion(version) {
              if (jsVersions.some(v => v.VersionName === version)) {
                return jsVersions[jsVersions.length - 1].VersionName;
              } else if (pythonVersions.some(v => v.VersionName === version)) {
                return pythonVersions[pythonVersions.length - 1].VersionName;
              } else {
                throw Error(`Unknown version ${version}`);
              }
            }
          });
        } else {
          for (const version of data.RuntimeVersions) {
            if (version.VersionName === 'syn-1.0') {
              jsVersions.push(version);
            } else if (version.VersionName.startsWith('syn-nodejs-2.')) {
              jsVersions.push(version);
            } else if (version.VersionName.startsWith('syn-nodejs-puppeteer-')) {
              jsVersions.push(version);
            } else if (version.VersionName.startsWith('syn-python-selenium-')) {
              pythonVersions.push(version);
            } else {
              throw Error(`Unknown version ${version.VersionName}`);
            }
          }
        }
      }
    });
  });
}

async function upgradeCanary(upgrade) {
  console.log(`Upgrading canary ${upgrade.Name} from ${upgrade.FromVersion} to ${upgrade.ToVersion}`);
  await synthetics.updateCanary({ Name: upgrade.Name, RuntimeVersion: upgrade.ToVersion }).promise();
  while (true) {
    await usleep(SLEEP_TIME);
    console.log(`Getting the state of canary ${upgrade.Name}`);
    const response = await synthetics.getCanary({ Name: upgrade.Name }).promise();
    const state = response.Canary.Status.State;
    console.log(`The state of canary ${upgrade.Name} is ${state}`);
    if (state === 'ERROR' || response.Canary.Status.StateReason) {
      throw response.Canary.Status.StateReason;
    }
    if (state !== 'UPDATING') {
      return;
    }
  }
}

function usleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}
```