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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 Placement area, select where the logging call should be placed in the generated VCL. Valid values are Format Version Default, waf_debug (waf_debug_log), and None. See our guide on changing log placement for more information.
    • 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 exact value of the private key associated with the service account configured for your Pub/Sub topic.
  4. Click the Create button to create the new logging endpoint.
  5. 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",
  "client_ip":"%{req.http.Fastly-Client-IP}V",
  "geo_country":"%{client.geo.country_name}V",
  "geo_city":"%{client.geo.city}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",
  "fastly_is_edge":%{if(fastly.ff.visits_this_service == 0, "true", "false")}V,
  "response_state":"%{json.escape(fastly_info.state)}V",
  "response_status":%{resp.status}V,
  "response_reason":%{if(resp.response, "%22"+json.escape(resp.response)+"%22", "null")}V,
  "response_body_size":%{resp.body_bytes_written}V,
  "request_method":"%{json.escape(req.method)}V",
  "request_protocol":"%{json.escape(req.proto)}V",
  "fastly_server":"%{json.escape(server.identity)}V",
  "host":"%{if(req.http.Fastly-Orig-Host, req.http.Fastly-Orig-Host, req.http.Host)}V"
}

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