muxer.go

// MIT License
//
// Copyright (c) 2020 Lack
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

// Package mux provides proxy muxing
package muxer

import (
	"context"
	"sync"

	"github.com/lack-io/vine/core/client"
	"github.com/lack-io/vine/core/server"
	"github.com/lack-io/vine/core/server/mucp"
	"github.com/lack-io/vine/lib/debug/handler"
	"github.com/lack-io/vine/lib/proxy"
)

// Server is a proxy muxer that incudes the use of the DefaultHandler
type Server struct {
	// name of service
	Name string
	// Proxy handler
	Proxy proxy.Proxy
}

var (
	once sync.Once
)

func (s *Server) ProcessMessage(ctx context.Context, msg server.Message) error {
	if msg.Topic() == s.Name {
		return mucp.NewRouter().ProcessMessage(ctx, msg)
	}
	return s.Proxy.ProcessMessage(ctx, msg)
}

func (s *Server) ServeRequest(ctx context.Context, req server.Request, rsp server.Response) error {
	if req.Service() == s.Name {
		return mucp.NewRouter().ServeRequest(ctx, req, rsp)
	}
	return s.Proxy.ServeRequest(ctx, req, rsp)
}

func New(name string, p proxy.Proxy) *Server {
	// only register this once
	once.Do(func() {
		server.Handle(
			// inject the debug handler
			server.NewHandler(
				handler.NewHandler(client.DefaultClient),
				server.InternalHandler(true),
			),
		)
	})

	return &Server{
		Name:  name,
		Proxy: p,
	}
}