Example 4: Using a Function to Invoke a Subfunction
Scenario
This section uses Python as an example to describe how to invoke a subfunction by using a function.
For details about how to call APIs, see Calling APIs.
Prerequisites
An agency with the FunctionGraph Administrator or Tenant Administrator permission has been created.
Overall Procedure
- Create a subfunction.
- Create a function.
- Use the function to invoke the subfunction.
Step 1: Create a Subfunction
- Create a subfunction on the console. Set parameters by referring to Figure 1 and retain the default values for other parameters.
Step 2: Create a Function
- Create a function on the console. Select an agency with the FunctionGraph Administrator or Tenant Administrator permission. In addition, set parameters as shown in Figure 2 and retain the default values for other parameters.
- On the Code tab page, edit the code. The sample code is as follows:
import json import requests def handler (event, context): token = context.getToken() project_id = context.getProjectID() urn = 'urn:fss:xx-xxxxx-x:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx:function:xxx:subfunction:latest' # Subfunction URN, which can be queried on the right of the topology on the subfunction details page. url = 'https://functiongraph.{region_id}.{external_global_domain_name}/v2/%s/fgs/functions/%s/invocations' % (project_id,urn) headers = { "x-auth-token": token, "content-type": 'application/json' } body = {"k":"v"} resp = requests.post(url, json=body, headers=headers, verify=False) print(resp.text) return { "statusCode": 200, "isBase64Encoded": False, "body": json.dumps(event), "headers": { "Content-Type": "application/json" } }
Step 3: Use the Function to Invoke the Subfunction
- On the function details page, click Test to invoke the function.
- View the execution result.
- The execution result of the function is Success and 200 is returned.
Figure 3 Function execution record
- The Logs tab page shows details about subfunction invocation.
Figure 4 Subfunction execution record
- The execution result of the function is Success and 200 is returned.
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