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  • fn project 扩展

    目前支持的扩展方式
     
    1. Listeners - listen to API events such as a route getting updated and react accordingly.
    2. Middleware - a chain of middleware is executed before an API handler is called.
    3. Add API Endpoints - extend the default Fn API.
     
    具体的官方介绍
     

    Listeners

    Listeners are the main way to extend Fn.

    The following listener types are supported:

      • App Listeners - GoDoc
      • Runner Listeners - GoDoc

    Creating a Listener

    You can easily use app and runner listeners by creating a struct with valid methods satisfying the interface for the respective listener and adding it to the Fn API

    Example:

    package main
    
    import (
        "context"
    
        "github.com/fnproject/functions/api/server"
        "github.com/fnproject/functions/api/models"
    )
    
    type myCustomListener struct{}
    
    func (c *myCustomListener) BeforeAppCreate(ctx context.Context, app *models.App) error { return nil }
    func (c *myCustomListener) AfterAppCreate(ctx context.Context, app *models.App) error { return nil }
    
    func (c *myCustomListener) BeforeAppUpdate(ctx context.Context, app *models.App) error { return nil }
    func (c *myCustomListener) AfterAppUpdate(ctx context.Context, app *models.App) error { return nil }
    
    func (c *myCustomListener) BeforeAppDelete(ctx context.Context, app *models.App) error { return nil }
    func (c *myCustomListener) BeforeAppDelete(ctx context.Context, app *models.App) error { return nil }
    
    function main () {
        srv := server.New(/* Here all required parameters to initialize the server */)
    
        srv.AddAppListener(myCustomListener)
    
        srv.Run()
    }
    

    Middleware

    Middleware enables you to add functionality to every API request. For every request, the chain of Middleware will be called in order, allowing you to modify or reject requests, as well as write output and cancel the chain.

    NOTES:

        • middleware is responsible for writing output if it's going to cancel the chain.
        • cancel the chain by returning an error from your Middleware's Serve method.

    See examples of this in examples/middleware/main.go.

    Adding API Endpoints

    You can add API endpoints to the Fn server by using the AddEndpoint and AddEndpointFunc methods.

    See examples of this in examples/extensions/main.go.

     
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  • 原文地址:https://www.cnblogs.com/rongfengliang/p/7629505.html
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