Viewing Logs

You can view the Cloud Function logs using either:

• The Stackdriver logging UI in the Cloud Console


• Using logging API

// By default, the client will authenticate using the service account file

// specified by the GOOGLE_APPLICATION_CREDENTIALS environment variable and use

// the project specified by the GCLOUD_PROJECT environment variable. See

// https://googlecloudplatform.github.io/gcloud-node/#/docs/google-cloud/latest/guides/authentication

const Logging = require('@google-cloud/logging');



function getLogEntries () {

  // Instantiates a client

  const logging = Logging();



  const options = {

    pageSize: 10,

    filter: 'resource.type=cloud_function'

  };



  // Retrieve the latest Cloud Function log entries

  // See https://googlecloudplatform.github.io/gcloud-node/#/docs/logging

  return logging.getEntries(options)

    .then(([entries]) => {

      console.log('Entries:');

      entries.forEach((entry) => console.log(entry));

      return entries;

    });

}

• Using gcloud:

To view logs with the gcloud tool, use the logs read command:

gcloud functions logs read

To view the logs for a specific function, provide the function name as
an argument:

gcloud functions logs read <FUNCTION_NAME>

You can even view the logs for a specific execution:

gcloud functions logs read <FUNCTION_NAME> --execution-id EXECUTION_ID

For the full range of log viewing options, view the help for logs
read:

gcloud functions logs read -h

Writing Logs

You can use console.log() or console.error().

• console.log() commands have the INFO log level.


• console.error() commands have the ERROR log level.


• Internal system messages have the DEBUG log level.

More info about viewing Cloud Function logs is available here.