External network access and private connectivity on Google Cloud¶

Outbound private connectivity costs¶

You pay for each private connectivity endpoint along with total data processed. For pricing of these items, see the Snowflake Service Consumption Table.

You can explore the cost of these items by filtering on the following service types when querying billing views in the ACCOUNT_USAGE and ORGANIZATION_USAGE schemas:

• OUTBOUND_PRIVATELINK_ENDPOINT

• OUTBOUND_PRIVATELINK_DATA_PROCESSED

For example, you can query the USAGE_IN_CURRENCY_DAILY view and filter on these service types.

Configure external network access¶

To configure outbound private connectivity with external network access on Google Cloud, do the following steps:

1. In Snowflake, call the SYSTEM$PROVISION_PRIVATELINK_ENDPOINT system function to provision a private connectivity endpoint in your Snowflake VNet to enable Snowflake to connect to a Google Cloud external service using private connectivity:

   USE ROLE ACCOUNTADMIN;
   
   SELECT SYSTEM$PROVISION_PRIVATELINK_ENDPOINT(
     'projects/<project_id>/regions/us-west2/serviceAttachments/cloud-func',
     'my-hello-echo-function.com',
   );
   

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2. In the Google Cloud console, go to the service attachment and accept the newly connected Snowflake project.

3. In Snowflake, create a network rule, specifying the PRIVATE_HOST_PORT property to enable private connectivity:

   CREATE DATABASE IF NOT EXISTS EXTERNAL_ACCESS_DB;
   
   CREATE OR REPLACE NETWORK RULE EXTERNAL_ACCESS_DB.PUBLIC.CLOUD_FUNC_RULE
      MODE = EGRESS
      TYPE = PRIVATE_HOST_PORT
      VALUE_LIST = ('my-hello-echo-function:443');
   

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4. In Snowflake, create an external access integration, specifying the network rule from the previous step:

   CREATE OR REPLACE EXTERNAL ACCESS INTEGRATION WEB_SERVER_EAI ALLOWED_NETWORK_RULES = (EXTERNAL_ACCESS_DB.PUBLIC.CLOUD_FUNC_RULE)
   
      ENABLED = TRUE;
   

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5. In Snowflake, execute the following SQL statements to create a function that can use the external access integration:

   CREATE OR REPLACE FUNCTION CALL_FUNC(name varchar)
   returns varchar
   language java
   external_access_integrations = (WEB_SERVER_EAI)
   handler = 'UDFClient.call'
   as
   $$
   import java.net.http.HttpClient;
   import java.net.http.HttpRequest;
   import java.net.http.HttpResponse;
   import java.net.URI;
   import java.io.IOException;
   
   public class UDFClient {
     private HttpClient client;
   
     public UDFClient() {
       this.client = HttpClient.newBuilder().version(HttpClient.Version.HTTP_1_1).build();
   }
   
   public String call(String name) throws IOException, InterruptedException {
     HttpRequest request = HttpRequest.newBuilder()
          .header("Content-Type", "application/json")
          .uri(URI.create("http://my-hello-echo-function?name=" + name))
          .GET()
          .build();
   
     HttpResponse<String> response =
          client.send(request, HttpResponse.BodyHandlers.ofString());
   
     return String.valueOf(response.body());
    }
   }
   $$;
   

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6. In Snowflake, call the function you created in the previous step:

SELECT CALL_FUNC("snowflake");

-- Returns "Hello snowflake!"

If you no longer need the private connectivity endpoint for the external network access integration, call the SYSTEM$DEPROVISION_PRIVATELINK_ENDPOINT system function.

The following sections provide Google Cloud-specific syntax for system functions you use to manage private connectivity endpoints for Google Cloud.

SELECT SYSTEM$PROVISION_PRIVATELINK_ENDPOINT(
 '<service_attachment_id>',
 '<hostname>'
);

SELECT SYSTEM$PROVISION_PRIVATELINK_ENDPOINT(
  'projects/my-project/regions/us-west2/serviceAttachments/my-http-server',
  'my-http-server.com'
);

 SELECT SYSTEM$DEPROVISION_PRIVATELINK_ENDPOINT(
   '<service_attachment_id>'
);

 SELECT SYSTEM$RESTORE_PRIVATELINK_ENDPOINT(
   '<service_attachment_id>'
);

SELECT SYSTEM$GET_PRIVATELINK_ENDPOINTS_INFO();

[
  {
    "provider_resource_id": "<service_attachment_id>",
    "snowflake_resource_id": "<privatelink_endpoint_name>",
    "host": "<hostname>",
    "endpoint_state": "<endpoint_state_on_snowflake_side>",
    "status": "<connection_status_on_gcp>"
 }
]