Example 3: Creating a Function by Uploading Code to an OBS Bucket

Scenario

This example guides you through the procedure for uploading local code to an Object Storage Service (OBS) bucket and creating a Python 2.7 function using the link URL of the OBS bucket.

For details about how to call APIs, see Calling APIs.

Prerequisites

An OBS bucket has been created.

Overall Procedure

After writing function code in your local environment, upload the code file to an OBS bucket and use the link URL of the OBS bucket to create a function. The procedure is as follows:

1. Write code in your local environment to create a function project.
2. Compress the code file into a ZIP package, upload the package to the OBS bucket, and record the link URL of this bucket.
3. Call the API in Creating a Function to create a function using the link URL of the OBS bucket.

Step 1: Create a Function Project

1. Write code for printing text helloworld.

   Open a text editor, compile a HelloWorld function, and save the code file as helloworld.py. The code is as follows:

   def printhello(): 
       print 'Hello world!' 

2. Define a FunctionGraph function.

   Open a text editor, define a function, and save the function file as index.py under the same directory as the helloworld.py file. The function code is as follows:

   import json 
   import helloworld 
    
   def handler (event, context): 
       output =json.dumps(event) 
       helloworld.printhello() 
       return output

Step 2: Upload the Project to an OBS Bucket

1. In the function project, select the helloworld.py and index.py files and compress them into fss_examples_python2.7.zip.
2. Upload the fss_examples_python2.7.zip package to the OBS bucket and record the link URL of the OBS bucket.

Step 3: Call the Function Creation API to Create a Function Using the Link URL of the OBS Bucket

URI: POST /v2/{project_id}/fgs/functions

For details about the API, see Creating a Function.

• Example request

  POST  https://{Endpoint}/v2/{project_id}/fgs/functions
  {
   "code_type": "obs",
   "code_url": "https://test.obs.example.example.com/fss_examples_python2.7.zip",
   "func_name": "create_function_from_obs",
   "handler": "index.handler",
   "memory_size": 256,
   "package": "default",
   "runtime": "Python2.7",
   "timeout": 30
  }

  code_url indicates the link URL of the OBS bucket recorded in 2.

• Example response

  {
   "func_urn": "urn:fss:{project_name}:{project_id}:function:default:create_function_from_obs:latest",
   "func_name": "create_function_from_obs",
   "domain_id": "0503xxxa960",
   "namespace": "{project_id}",
   "project_name": "xxx",
   "package": "default",
   "runtime": "Python2.7",
   "timeout": 30,
   "handler": "index.handler",
   "memory_size": 256,
   "cpu": 400,
   "code_type": "obs",
   "code_url": "https://test.obs.example.example.com/fss_examples_python2.7.zip",
   "code_filename": "fss_examples_python2.7.zip",
   "code_size": 436,
   "digest": "3af770ada27514564b1a20d964cba4b35f432fa40f9fc4f4f7c1f0d2f42eac6cb4db1358c195235966b05f66b4664e7bf31c3f384a9066b3d1fcc3e96b4c3f65",
   "version": "latest",
   "image_name": "latest-200619100734@gjf4p",
   "last_modified": "2020-06-19T10:07:34+08:00",
   "strategy_config": {
    "concurrency": -1
   },
   "StrategyConfig": {},
   "enterprise_project_id": "0"
  }