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Log streaming: Google Cloud Pub/Sub

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Fastly's Real-Time Log Streaming feature can send log files to Cloud Pub/Sub, Google's global messaging and event data ingestion product.

Prerequisites

Before adding Cloud Pub/Sub as a logging endpoint for Fastly services, you will need to register for a Google Cloud Platform (GCP) account and then:

  • Create a service account on Google's website.
  • Navigate to the Pub/Sub section of the Google Cloud console. Follow the prompts to enable the API.
  • Create a Pub/Sub topic.
  • Obtain the private key from the JSON file associated with the service account configured for your Pub/Sub topic.

Adding Cloud Pub/Sub as a logging endpoint

Follow these instructions to add Cloud Pub/Sub as a logging endpoint:

  1. Review the information in our Setting Up Remote Log Streaming guide.

  2. Click the Google Cloud Pub/Sub Create endpoint button. The Create a Google Cloud Pub/Sub endpoint page appears.

    The Google Cloud Pub/Sub endpoint page

  3. Fill out the Create a Google Cloud Pub/Sub endpoint fields as follows:
    • In the Name field, enter a human-readable name for the endpoint.
    • In the Log format field, enter the data to send to Google Cloud Pub/Sub. See the example format section for details.
    • In the Project ID field, enter the ID of your Google Cloud Platform project.
    • In the Email field, enter the email address of the service account configured for your Pub/Sub topic.
    • In the Topic field, enter the Pub/Sub topic to which logs should be sent.
    • In the Secret Key field, enter the value of the private key associated with the service account configured for your Pub/Sub topic.

  4. Click the Advanced options link of the Create a Cloud Pub/Sub endpoint page. The Advanced options appear.

    the advanced options on the create a new Google Cloud Pub/Sub endpoint page

  5. In the Placement area, select where the logging call should be placed in the generated VCL. Valid values are Format Version Default, None, and waf_debug (waf_debug_log). Selecting None creates a logging object that can only be used in custom VCL. See our guide on WAF logging for more information about waf_debug_log.
  6. Click Create to create the new logging endpoint.
  7. Click the Activate button to deploy your configuration changes.

Example format

Data sent to Cloud Pub/Sub must be serialized as a JSON object, and every field in the JSON object must map to a string in your table's schema. The JSON can have nested data in it (e.g., the value of a key in your object can be another object). Here's an example format string for sending data:

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{
  "timestamp":"%{begin:%Y-%m-%dT%H:%M:%S}t",
  "time_elapsed":%{time.elapsed.usec}V,
  "is_tls":%{if(req.is_ssl, "true", "false")}V,
  "client_ip":"%{req.http.Fastly-Client-IP}V",
  "geo_city":"%{client.geo.city}V",
  "geo_country_code":"%{client.geo.country_code}V",
  "request":"%{req.method}V",
  "host":"%{req.http.Fastly-Orig-Host}V",
  "url":"%{json.escape(req.url)}V",
  "request_referer":"%{json.escape(req.http.Referer)}V",
  "request_user_agent":"%{json.escape(req.http.User-Agent)}V",
  "request_accept_language":"%{json.escape(req.http.Accept-Language)}V",
  "request_accept_charset":"%{json.escape(req.http.Accept-Charset)}V",
  "cache_status":"%{regsub(fastly_info.state, "^(HIT-(SYNTH)|(HITPASS|HIT|MISS|PASS|ERROR|PIPE)).*", "\\2\\3") }V"
}

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