Function Operations

Last updated: 2020-11-26 18:23:22

    Overview

    This document describes how to quickly create and deploy an SCF project.

    Prerequisites

    Directions

    Creating function

    Run the following command to quickly create a function in the Node.js language:

    sls init scf-demo

    Note:

    scf-demo in the command can be replaced with a template for another programming language. Currently, the SCF component supports the following components: go1-helloworld, nodejs1015-helloworld, php72-helloworld, and python36-helloworld.

    After the function is successfully created, there will be a serverless.yml configuration file in the scf-demo project directory, which defines the SCF resource information for each deployment. For more information on the configuration file, please see Configuration file.

    Deploying function

    Run the following command in the scf-demo directory to deploy the function:

    sls deploy

    A QR code will pop up. Please scan it to authorize and start deployment. After successful deployment, SCF resources will be automatically created.

    Note:

    If authentication fails, please authorize as instructed in Account and Permission Configuration.

    View function information

    Run the following command to view the information of the deployed SCF resources:

    sls info

    Removing function

    Run the following command to remove the deployed SCF resources:

    sls remove

    Configuration file


    Serverless Framework CLI relies on the configuration in the serverless.yml file when creating or updating a function. When the sls deploy command is executed to deploy a function, SCF resources will be created or updated according to the configuration in the serverless.yml file. Below is a simple example of this file. For more information on the configuration, please see Full Configuration.

    # SCF component configuration sample
    # For all configuration items, please visit https://github.com/serverless-components/tencent-scf/blob/master/docs/configure.md.
    
    # Component information
    component: scf # Name of the imported component, which is required. The `tencent-scf` component is used in this example
    name: scfdemo # Name of the created instance, which is required. Replace it with the name of your instance
    
    # Component parameters
    inputs:
      name: ${name}-${stage}-${app} # Function name
      src: ./  # Code path
      handler: index.main_handler # Entry
      runtime: Nodejs10.15 # Function runtime environment
      region: ap-guangzhou # Function region
      events: # Trigger
        - apigw: # Gateway trigger
            parameters:
              endpoints:
                - path: /
                  method: GET

    The serverless.yml file contains the following information:

    Component information

    Component Required Description
    component Yes Component name. You can run the sls registry command to query components available for import.
    name Yes Name of the created instance. An instance will be created when each component is deployed.

    Parameter information

    Parameters in inputs are component configuration parameters. The parameters of a simplest SCF component are as detailed below:

    Parameter Description
    name Function name, which also serves as a resource ID.
    src Code path.
    handler Function handler name.
    runtime Function runtime environment. Valid values: Python2.7, Python3.6, Nodejs6.10, Nodejs8.9, Nodejs10.15, Nodejs12.16, PHP5, PHP7, Go1, Java8, CustomRuntime.
    region Function region.
    events Trigger. Valid values: timer, apigw, cos, cmq, ckafka.

    Common Operation Commands

    Serverless Framework provides a set of operation commands for deployment orchestration, which can be used to quickly deploy function resources. For more information, please see List of Supported Commands.

    For a function successfully deployed by running the sls deploy command, the following common operation commands provided by the SCF component can also be used.

    Note:

    Such commands must be executed in the same directory as serverless.yml.

    • Publish function version
      Run the following command to publish the $LATEST version of the my-function function as a fixed version:
      sls publish-ver --inputs  function=my-function
    • Create alias
      Run the following command to create the routing-alias alias for the my-function function, with the routing rule of 50% traffic for version 1 and 50% traffic for version 2:
      sls create-alias --inputs name=routing-alias  function=my-function  version=1  
      config='{"weights":{"2":0.5}}'
    • Update alias
      Run the following command to update the flow rule of the routing-alias alias of the my-function function to 10% for version 1 and 90% for version 2:
      sls update-alias --inputs name=routing-alias  function=my-function  version=1 config='{"weights":{"2":0.9}}'
    • List alias
      Run the following command to list the routing-alias alias of the my-function function:
      sls list-alias --inputs function=my-function
    • Delete alias
      Run the following command to delete the routing-alias alias of the my-function function:
      sls delete-alias --inputs name=routing-alias  function=my-function
    • Trigger function
      Run the following command to invoke the functionName function and pass the JSON parameter {"weights":{"2":0.1}}:
      sls invoke  --inputs function=functionName  clientContext='{"weights":{"2":0.1}}'

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