plugin

package
Version: v1.4.1 Latest Latest
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Published: Jun 8, 2021 License: Apache-2.0 Imports: 9 Imported by: 2

Documentation

Overview

Package plugin provides plugin register interfaces for building http handler plugins.

Usage example:

package main

import (
	"context"
	"errors"
	"fmt"
	"html"
	"net/http"
)

// HandlerRegisterer is the symbol the plugin loader will try to load. It must implement the Registerer interface
var HandlerRegisterer = registerer("lura-example")

type registerer string

func (r registerer) RegisterHandlers(f func(
	name string,
	handler func(context.Context, map[string]interface{}, http.Handler) (http.Handler, error),
)) {
	f(string(r), r.registerHandlers)
}

func (r registerer) registerHandlers(ctx context.Context, extra map[string]interface{}, _ http.Handler) (http.Handler, error) {
	// check the passed configuration and initialize the plugin
	name, ok := extra["name"].(string)
	if !ok {
		return nil, errors.New("wrong config")
	}
	if name != string(r) {
		return nil, fmt.Errorf("unknown register %s", name)
	}
	// return the actual handler wrapping or your custom logic so it can be used as a replacement for the default http handler
	return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
		fmt.Fprintf(w, "Hello, %q", html.EscapeString(req.URL.Path))
	}), nil
}

func init() {
	fmt.Println("lura-example handler plugin loaded!!!")
}

func main() {}

SPDX-License-Identifier: Apache-2.0

SPDX-License-Identifier: Apache-2.0

SPDX-License-Identifier: Apache-2.0

Index

Constants

View Source
const Namespace = "github_com/devopsfaith/krakend/transport/http/server/handler"

Variables

This section is empty.

Functions

func Load

func Load(path, pattern string, rcf RegisterHandlerFunc) (int, error)

func LoadWithLogger added in v1.4.1

func LoadWithLogger(path, pattern string, rcf RegisterHandlerFunc, logger logging.Logger) (int, error)

func RegisterHandler

func RegisterHandler(
	name string,
	handler func(context.Context, map[string]interface{}, http.Handler) (http.Handler, error),
)

Types

type LoggerRegisterer added in v1.4.1

type LoggerRegisterer interface {
	RegisterLogger(interface{})
}

type Plugin

type Plugin interface {
	Lookup(name string) (plugin.Symbol, error)
}

Plugin is the interface of the loaded plugins

type RegisterHandlerFunc

type RegisterHandlerFunc func(
	name string,
	handler func(context.Context, map[string]interface{}, http.Handler) (http.Handler, error),
)

type Registerer

type Registerer interface {
	RegisterHandlers(func(
		name string,
		handler func(context.Context, map[string]interface{}, http.Handler) (http.Handler, error),
	))
}

type RunServer

func New

func New(logger logging.Logger, next RunServer) RunServer

Directories

Path Synopsis
SPDX-License-Identifier: Apache-2.0
SPDX-License-Identifier: Apache-2.0

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