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Cast Debug Logger | Google for Developers

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The Web Receiver SDK provides the CastDebugLogger API for developers to easily debug their Web Receiver app and a companion Command and Control (CaC) Tool to capture logs.

To use the CastDebugLogger API, include the following script in your Web Receiver app right after the Web Receiver SDK script:

<!-- Web Receiver SDK -->
<script src="//www.gstatic.com/cast/sdk/libs/caf_receiver/v3/cast_receiver_framework.js"></script>
<!-- Cast Debug Logger -->
<script src="//www.gstatic.com/cast/sdk/libs/devtools/debug_layer/caf_receiver_logger.js"></script>

Create the CastDebugLogger object and enable the logger:

const castDebugLogger = cast.debug.CastDebugLogger.getInstance();

const context = cast.framework.CastReceiverContext.getInstance();

context.addEventListener(cast.framework.system.EventType.READY, () => {
  if (!castDebugLogger.debugOverlayElement_) {
      // Enable debug logger and show a 'DEBUG MODE' overlay at top left corner.
      castDebugLogger.setEnabled(true);
  }
});

When the debug logger is enabled, an overlay displaying DEBUG MODE will show on the receiver.

Using CastDebugLogger you can easily log player events that are fired by the Web Receiver SDK and use different logger levels to log the event data. The loggerLevelByEvents config takes cast.framework.events.EventType and cast.framework.events.category to specify the events to be logged.

For example, if you want to know when the player CORE events are triggered or a mediaStatus change is broadcasted, use the following config to log the events:

castDebugLogger.loggerLevelByEvents = {
  'cast.framework.events.category.CORE': cast.framework.LoggerLevel.INFO,
  'cast.framework.events.EventType.MEDIA_STATUS': cast.framework.LoggerLevel.DEBUG
}

The CastDebugLogger API allows you to create log messages that appear on the Web Receiver debug overlay with different colors. Use the following log methods, listed in order from highest to lowest priority:

• castDebugLogger.error(custom_tag, message);
• castDebugLogger.warn(custom_tag, message);
• castDebugLogger.info(custom_tag, message);
• castDebugLogger.debug(custom_tag, message);

For each log method, the first parameter should be a custom tag and the second parameter is the log message. The tag can be any string that you find helpful.

Here is an example of how to use the debug logger in the LOAD interceptor.

const LOG_TAG = 'MyReceiverApp';

playerManager.setMessageInterceptor(
    cast.framework.messages.MessageType.LOAD,
    request => {
        castDebugLogger.debug(LOG_TAG, 'Intercepting LOAD request');

        return new Promise((resolve, reject) => {
            fetchMediaAsset(request.media.contentId).then(
                data => {
                    let item = data[request.media.contentId];
                    if (!item) {
                        castDebugLogger.error(LOG_TAG, 'Content not found');

                        reject();
                    } else {
                        request.media.contentUrl = item.stream.hls;
                        castDebugLogger.info(LOG_TAG,
                            'Playable URL:', request.media.contentUrl);

                        resolve(request);
                    }
                }
            );
        });
    }
);

You can control which messages appear on the debug overlay by setting the log level in loggerLevelByTags for each custom tag. For example, enabling a custom tag with log level cast.framework.LoggerLevel.DEBUG would display all messages added with error, warn, info, and debug log messages. Another example is that enabling a custom tag with WARNING level would only display error and warn log messages.

The loggerLevelByTags config is optional. If a custom tag is not configured for its logger level, all log messages will display on the debug overlay.

const LOG_TAG1 = 'Tag1';
const LOG_TAG2 = 'Tag2';

// Set verbosity level for custom tags
castDebugLogger.loggerLevelByTags = {
    [LOG_TAG1]: cast.framework.LoggerLevel.WARNING,
    [LOG_TAG2]: cast.framework.LoggerLevel.DEBUG,
};
castDebugLogger.debug(LOG_TAG1, 'debug log from tag1');
castDebugLogger.info(LOG_TAG1, 'info log from tag1');
castDebugLogger.warn(LOG_TAG1, 'warn log from tag1');
castDebugLogger.error(LOG_TAG1, 'error log from tag1');

castDebugLogger.debug(LOG_TAG2, 'debug log from tag2');
castDebugLogger.info(LOG_TAG2, 'info log from tag2');
castDebugLogger.warn(LOG_TAG2, 'warn log from tag2');
castDebugLogger.error(LOG_TAG2, 'error log from tag2');

// example outputs:
// [Tag1] [WARN] warn log from tag1
// [Tag1] [ERROR] error log from tag1
// [Tag2] [DEBUG] debug log from tag2
// [Tag2] [INFO] info log from tag2
// [Tag2] [WARN] warn log from tag2
// [Tag2] [ERROR] error log from tag2

The Cast Debug Logger provides a debug overlay on the Web Receiver to show your custom log messages. Use showDebugLogs to toggle the debug overlay and clearDebugLogs to clear log messages on the overlay.

Reminder: use showDebugLogs and clearDebugLogs after castDebugLogger is enabled.

const context = cast.framework.CastReceiverContext.getInstance();

context.addEventListener(cast.framework.system.EventType.READY, () => {
  if (!castDebugLogger.debugOverlayElement_) {
      // Enable debug logger and show a 'DEBUG MODE' overlay at top left corner.
      castDebugLogger.setEnabled(true);
      // Show debug overlay
      castDebugLogger.showDebugLogs(true);
      // Clear log messages on debug overlay
      castDebugLogger.clearDebugLogs();
  }
});

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2024-09-18 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-09-18 UTC."],[[["The CastDebugLogger API enables developers to debug their Web Receiver app alongside the Command and Control (CaC) tool for capturing logs, requiring Cast device registration and firmware version 1.44 or above."],["Initialization involves including specific scripts for the Web Receiver SDK and the Cast Debug Logger, creating a CastDebugLogger object, enabling it within the 'READY' event listener, and ensuring `setEnabled` is set to false for production."],["Developers can log player events using the `loggerLevelByEvents` config, specifying event types and categories for logging with different verbosity levels like INFO or DEBUG."],["Custom log messages with custom tags are supported using methods like `error`, `warn`, `info`, and `debug`, with the ability to control message visibility through the `loggerLevelByTags` configuration."],["The debug overlay, toggled with `showDebugLogs` and cleared with `clearDebugLogs`, displays log messages and is activated after enabling the CastDebugLogger."]]],["The CastDebugLogger API allows debugging Web Receiver apps. To use it, include the debug script after the Web Receiver SDK script and instantiate `CastDebugLogger`. Enable it with `setEnabled(true)` to display a \"DEBUG MODE\" overlay. Log player events using `loggerLevelByEvents` and custom messages with `error`, `warn`, `info`, or `debug` methods, assigning custom tags. Set tag-specific log levels with `loggerLevelByTags`. Manage the overlay using `showDebugLogs` and `clearDebugLogs`. Remember to register your device and change setEnabled to **false** for production.\n"]]

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