how to calculate total time for one request from chrome driver PERFORMANCE logs?

Question

I am working on selenium to track network traffic for website.

I have followed referred two links:

1. Using Selenium how to get network request
2. http://chromedriver.chromium.org/logging/performance-log

I got log data as after configuration. you can refer point 2 for example data: Here is what i got

[2015-03-21T16:50:20+0400] [INFO] {"message":{"method":"Network.responseReceived","params":{"frameId":"28480.1","loaderId":"28480.2","requestId":"28480.1","response":{"connectionId":0,"connectionReused":false,"encodedDataLength":-1,"fromDiskCache":false,"fromServiceWorker":false,"headers":{"Access-Control-Allow-Origin":"*","Content-Type":"text/plain;charset=US-ASCII"},"mimeType":"text/plain","protocol":"data","status":200,"statusText":"OK","url":"data:,"},"timestamp":1426942217.5344,"type":"Other"}},"webview":"C359224A-06E5-42B6-8D1B-52687733920A"}
[2015-03-21T16:50:20+0400] [INFO] {"message":{"method":"Network.loadingFinished","params":{"encodedDataLength":0,"requestId":"28480.1","timestamp":1426942217.5344}},"webview":"C359224A-06E5-42B6-8D1B-52687733920A"}
[2015-03-21T16:50:20+0400] [INFO] {"message":{"method":"Page.frameNavigated","params":{"frame":{"id":"28480.1","loaderId":"28480.2","mimeType":"text/plain","securityOrigin":"://","url":"data:,"}}},"webview":"C359224A-06E5-42B6-8D1B-52687733920A"}
[2015-03-21T16:50:21+0400] [INFO] {"message":{"method":"Page.loadEventFired","params":{"timestamp":1426942220.99924}},"webview":"C359224A-06E5-42B6-8D1B-52687733920A"}
[2015-03-21T16:50:21+0400] [INFO] {"message":{"method":"Page.frameStoppedLoading","params":{"frameId":"28480.1"}},"webview":"C359224A-06E5-42B6-8D1B-52687733920A"}
[2015-03-21T16:50:21+0400] [INFO] {"message":{"method":"Page.domContentEventFired","params":{"timestamp":1426942220.99927}},"webview":"C359224A-06E5-42B6-8D1B-52687733920A"}
....

But i dont know how to calculate time of one request xhr request?

I have searched for it but now luck...

Answer 1

For each log entry, the total time taken to complete a request is : message.params.response.timing.sendStart - message.params.response.timing.sendEnd.

The performance log should be filtered for only those messages which have message.method = "Network.responseReceived".

---

Regarding understanding message.params.response.timing section, for instance something as follows:

{"message": {
    ...
     "params": {
        ...
          "response": {
             "timing": {
                 "sendEnd": 1.132,
                 "sendStart": 0.96,
                 ...
        },
        "url": "https://example.com/GetBlah"
      }
    }
  }
}

look here: https://groups.google.com/g/google-chrome-developer-tools/c/FCCV2J7BaIY

---

After enabling the PERFORMANCE logs, you can iterate the log entries using:

List<LogEntry> entries = this.driver.manage().logs().get(LogType.PERFORMANCE).getAll();

Then, you can get the json with the following values:

private String url;
private Boolean timing;
private Long connectEnd;
private Long connectStart;
private Long dnsEnd;
private Long dnsStart;
private Long receiveHeadersEnd;
private Long sslStart;
private Long sslEnd;
private Long proxyStart;
private Long proxyEnd;
private Long sendStart;
private Long sendEnd;
private String mimeType;
private String requestStatus;
private String method;

to get the total time for a single request you can use:

sendStart - sendEnd

Creation of the Chrome Driver:

    DesiredCapabilities capabilities = new DesiredCapabilities();
    LoggingPreferences logPrefs = new LoggingPreferences();
    logPrefs.enable(LogType.PERFORMANCE, Level.ALL);
    logPrefs.enable(LogType.DRIVER, Level.ALL);
    capabilities.setCapability(CapabilityType.LOGGING_PREFS, logPrefs);

    Map<String, Object> perfLogPrefs = new HashMap<String, Object>();
    perfLogPrefs.put("traceCategories", "browser,devtools.timeline,devtools");
    ChromeOptions options = new ChromeOptions();
    options.setExperimentalOption("perfLoggingPrefs", perfLogPrefs);
    capabilities.setCapability(ChromeOptions.CAPABILITY, options);

    WebDriver driver = new ChromeDriver(capabilities);