Node.js 和 Puppeteer 示例 Python 和 Selenium 示例

金丝雀脚本示例代码

本节包含对 CloudWatch Synthetics 金丝雀脚本的一些可能的函数进行说明的代码示例。

Node.js 和 Puppeteer 示例

设置 Cookie

网站依赖 Cookie 来提供自定义功能或跟踪用户。通过在 CloudWatch Synthetics 脚本中设置 Cookie，您可以模拟此自定义行为并对其进行验证。

例如，某个网站可能会对再次访问该网站的用户显示登录链接，而不是注册链接。


var synthetics = require('Synthetics');
const log = require('SyntheticsLogger');

const pageLoadBlueprint = async function () {

    let url = "http://smile.amazon.com/";

    let page = await synthetics.getPage();

    // Set cookies.  I found that name, value, and either url or domain are required fields.
    const cookies = [{
      'name': 'cookie1',
      'value': 'val1',
      'url': url
    },{
      'name': 'cookie2',
      'value': 'val2',
      'url': url
    },{
      'name': 'cookie3',
      'value': 'val3',
      'url': url
    }];
    
    await page.setCookie(...cookies);

    // Navigate to the url
    await synthetics.executeStep('pageLoaded_home', async function (timeoutInMillis = 30000) {
        
        var response = await page.goto(url, {waitUntil: ['load', 'networkidle0'], timeout: timeoutInMillis});

        // Log cookies for this page and this url
        const cookiesSet = await page.cookies(url);
        log.info("Cookies for url: " + url + " are set to: " + JSON.stringify(cookiesSet));
    });

};

exports.handler = async () => {
    return await pageLoadBlueprint();
};

设备仿真

您可以编写模拟各种设备的脚本，以便粗略估计页面在这些设备上的外观和行为。

以下示例模拟的是 iPhone 6 设备。有关仿真的更多信息，请参阅 Puppeteer 文档中的 page.emulate(options)。


var synthetics = require('Synthetics');
const log = require('SyntheticsLogger');
const puppeteer = require('puppeteer-core');

const pageLoadBlueprint = async function () {
    
    const iPhone = puppeteer.devices['iPhone 6'];

    // INSERT URL here
    const URL = "https://amazon.com";

    let page = await synthetics.getPage();
    await page.emulate(iPhone);

    //You can customize the wait condition here. For instance,
    //using 'networkidle2' may be less restrictive.
    const response = await page.goto(URL, {waitUntil: 'domcontentloaded', timeout: 30000});
    if (!response) {
        throw "Failed to load page!";
    }
    
    await page.waitFor(15000);

    await synthetics.takeScreenshot('loaded', 'loaded');
    
    //If the response status code is not a 2xx success code
    if (response.status() < 200 || response.status() > 299) {
        throw "Failed to load page!";
    }
};

exports.handler = async () => {
    return await pageLoadBlueprint();
};

多步骤 API 金丝雀

此示例代码演示了一个具有两个 HTTP 步骤的 API 金丝雀：对正面和负面测试用例测试同一个 API。传递步骤配置以启用请求/响应标头报告。此外，其会隐藏 Authorization（授权）标头和 X-Amz-Security-Token，因为它们二者包含用户凭证。

当此脚本用作金丝雀时，您可以查看有关每个步骤和相关 HTTP 请求的详细信息，例如步骤通过/失败、持续时间和性能指标（如 DNS 查找时间和第一字节时间）。也可以查看金丝雀运行的 2xx、4xx 和 5xx 的数量。



var synthetics = require('Synthetics');
const log = require('SyntheticsLogger');

const apiCanaryBlueprint = async function () {
    
    // Handle validation for positive scenario
    const validatePositiveCase = async function(res) {
        return new Promise((resolve, reject) => {
            if (res.statusCode < 200 || res.statusCode > 299) {
                throw res.statusCode + ' ' + res.statusMessage;
            }
     
            let responseBody = '';
            res.on('data', (d) => {
                responseBody += d;
            });
     
            res.on('end', () => {
                // Add validation on 'responseBody' here if required. For ex, your status code is 200 but data might be empty
                resolve();
            });
        });
    };
    
    // Handle validation for negative scenario
    const validateNegativeCase = async function(res) {
        return new Promise((resolve, reject) => {
            if (res.statusCode < 400) {
                throw res.statusCode + ' ' + res.statusMessage;
            }
            
            resolve();
        });
    };
    
    let requestOptionsStep1 = {
        'hostname': 'myproductsEndpoint.com',
        'method': 'GET',
        'path': '/test/product/validProductName',
        'port': 443,
        'protocol': 'https:'
    };
    
    let headers = {};
    headers['User-Agent'] = [synthetics.getCanaryUserAgentString(), headers['User-Agent']].join(' ');
    
    requestOptionsStep1['headers'] = headers;

    // By default headers, post data and response body are not included in the report for security reasons. 
    // Change the configuration at global level or add as step configuration for individual steps
    let stepConfig = {
        includeRequestHeaders: true, 
        includeResponseHeaders: true,
        restrictedHeaders: ['X-Amz-Security-Token', 'Authorization'], // Restricted header values do not appear in report generated.
        includeRequestBody: true,
        includeResponseBody: true
    };
       

    await synthetics.executeHttpStep('Verify GET products API with valid name', requestOptionsStep1, validatePositiveCase, stepConfig);
    
    let requestOptionsStep2 = {
        'hostname': 'myproductsEndpoint.com',
        'method': 'GET',
        'path': '/test/canary/InvalidName(',
        'port': 443,
        'protocol': 'https:'
    };
    
    headers = {};
    headers['User-Agent'] = [synthetics.getCanaryUserAgentString(), headers['User-Agent']].join(' ');
    
    requestOptionsStep2['headers'] = headers;

    // By default headers, post data and response body are not included in the report for security reasons. 
    // Change the configuration at global level or add as step configuration for individual steps
    stepConfig = {
        includeRequestHeaders: true, 
        includeResponseHeaders: true,
        restrictedHeaders: ['X-Amz-Security-Token', 'Authorization'], // Restricted header values do not appear in report generated.
        includeRequestBody: true,
        includeResponseBody: true
    };
    
    await synthetics.executeHttpStep('Verify GET products API with invalid name', requestOptionsStep2, validateNegativeCase, stepConfig);
    
};

exports.handler = async () => {
    return await apiCanaryBlueprint();
};

Python 和 Selenium 示例

以下示例 Selenium 代码是一个金丝雀，当未加载目标元素时，此金丝雀会失败并显示自定义错误消息。


from aws_synthetics.selenium import synthetics_webdriver as webdriver
from aws_synthetics.common import synthetics_logger as logger
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By

def custom_selenium_script():
    # create a browser instance
    browser = webdriver.Chrome()
    browser.get('https://www.example.com/')
    logger.info('navigated to home page')
    # set cookie
    browser.add_cookie({'name': 'foo', 'value': 'bar'})
    browser.get('https://www.example.com/')
    # save screenshot
    browser.save_screenshot('signed.png')
    # expected status of an element
    button_condition = EC.element_to_be_clickable((By.CSS_SELECTOR, '.submit-button'))
    # add custom error message on failure
    WebDriverWait(browser, 5).until(button_condition, message='Submit button failed to load').click()
    logger.info('Submit button loaded successfully')
    # browser will be quit automatically at the end of canary run, 
    # quit action is not necessary in the canary script
    browser.quit()

# entry point for the canary
def handler(event, context):
    return custom_selenium_script()

Javascript 在您的浏览器中被禁用或不可用。

要使用 Amazon Web Services 文档，必须启用 Javascript。请参阅浏览器的帮助页面以了解相关说明。

排查 VPC 上金丝雀的问题

金丝雀和 X-Ray 跟踪