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http.go
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http.go
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// MIT License
//
// Copyright (c) 2020 The vine Authors
//
// 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 http is a http reverse proxy handler
package http
import (
"errors"
"fmt"
"net/http"
"net/http/httputil"
"net/url"
"github.com/gin-gonic/gin"
"github.com/vine-io/vine/core/client/selector"
"github.com/vine-io/vine/lib/api"
"github.com/vine-io/vine/lib/api/handler"
ctx "github.com/vine-io/vine/util/context"
)
const (
Handler = "http"
)
type httpHandler struct {
options handler.Options
// set with different initialiser
s *api.Service
}
func (h *httpHandler) Handle(c *gin.Context) {
service, err := h.getService(c)
if err != nil {
c.JSON(500, err.Error())
return
}
if len(service) == 0 {
c.JSON(404, "")
return
}
rp, err := url.Parse(service)
if err != nil {
c.JSON(500, "")
return
}
proxy := httputil.NewSingleHostReverseProxy(rp)
proxy.Director = func(req *http.Request) {
req.Header = c.Request.Header
req.Host = rp.Host
req.URL.Scheme = rp.Scheme
req.URL.Host = rp.Host
req.URL.Path = rp.Path
}
proxy.ServeHTTP(c.Writer, c.Request)
}
// getService returns the service for this request from the selector
func (h *httpHandler) getService(c *gin.Context) (string, error) {
var service *api.Service
r := c.Request.Clone(ctx.FromRequest(c.Request))
if h.s != nil {
// we were given the service
service = h.s
} else if h.options.Router != nil {
// try get service from router
s, err := h.options.Router.Route(r)
if err != nil {
return "", err
}
service = s
} else {
// we have no way of routing the request
return "", errors.New("no route found")
}
// create a random selector
next := selector.Random(service.Services)
// get the next node
s, err := next()
if err != nil {
return "", nil
}
return fmt.Sprintf("http://%s", s.Address), nil
}
func (h *httpHandler) String() string {
return "http"
}
// NewHandler returns a http proxy handler
func NewHandler(opts ...handler.Option) handler.Handler {
options := handler.NewOptions(opts...)
return &httpHandler{
options: options,
}
}
// WithService creates a handler with a service
func WithService(s *api.Service, opts ...handler.Option) handler.Handler {
options := handler.NewOptions(opts...)
return &httpHandler{
options: options,
s: s,
}
}