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proxy.go
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proxy.go
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// Package proxy is a plugin for handling unknown calling or pushing.
//
// Copyright 2017 HenryLee. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package proxy
import (
"fmt"
"os"
"path/filepath"
"strings"
"sync"
"github.com/henrylee2cn/goutil"
tp "github.com/henrylee2cn/teleport/v6"
)
// NewPlugin creates a proxy plugin for handling unknown calling and pushing.
func NewPlugin(fn func(*Label) Forwarder) tp.Plugin {
return &proxy{
callForwarder: func(label *Label) CallForwarder {
return fn(label)
},
pushForwarder: func(label *Label) PushForwarder {
return fn(label)
},
}
}
// NewCallPlugin creates a proxy plugin for handling unknown calling.
func NewCallPlugin(fn func(*Label) CallForwarder) tp.Plugin {
return &proxy{callForwarder: fn}
}
// NewPushPlugin creates a proxy plugin for handling unknown pushing.
func NewPushPlugin(fn func(*Label) PushForwarder) tp.Plugin {
return &proxy{pushForwarder: fn}
}
type (
// Forwarder the object used to call and push
Forwarder interface {
CallForwarder
PushForwarder
}
// CallForwarder the object used to call
CallForwarder interface {
Call(uri string, arg interface{}, result interface{}, setting ...tp.MessageSetting) tp.CallCmd
}
// PushForwarder the object used to push
PushForwarder interface {
Push(uri string, arg interface{}, setting ...tp.MessageSetting) *tp.Status
}
// Label proxy label information
Label struct {
SessionID, RealIP, ServiceMethod string
}
proxy struct {
callForwarder func(*Label) CallForwarder
pushForwarder func(*Label) PushForwarder
}
)
var (
_ tp.PostNewPeerPlugin = new(proxy)
)
func (p *proxy) Name() string {
return "proxy"
}
func (p *proxy) PostNewPeer(peer tp.EarlyPeer) error {
if p.callForwarder != nil {
peer.SetUnknownCall(p.call)
}
if p.pushForwarder != nil {
peer.SetUnknownPush(p.push)
}
return nil
}
func (p *proxy) call(ctx tp.UnknownCallCtx) (interface{}, *tp.Status) {
var (
label Label
settings = make([]tp.MessageSetting, 0, 16)
)
label.SessionID = ctx.Session().ID()
ctx.VisitMeta(func(key, value []byte) {
settings = append(settings, tp.WithAddMeta(string(key), string(value)))
})
var (
result []byte
realIPBytes = ctx.PeekMeta(tp.MetaRealIP)
)
if len(realIPBytes) == 0 {
label.RealIP = ctx.IP()
settings = append(settings, tp.WithAddMeta(tp.MetaRealIP, label.RealIP))
} else {
label.RealIP = goutil.BytesToString(realIPBytes)
}
label.ServiceMethod = ctx.ServiceMethod()
callcmd := p.callForwarder(&label).Call(label.ServiceMethod, ctx.InputBodyBytes(), &result, settings...)
callcmd.InputMeta().VisitAll(func(key, value []byte) {
ctx.SetMeta(goutil.BytesToString(key), goutil.BytesToString(value))
})
stat := callcmd.Status()
if !stat.OK() && stat.Code() < 200 && stat.Code() > 99 {
stat.SetCode(tp.CodeBadGateway)
stat.SetMsg(tp.CodeText(tp.CodeBadGateway))
}
return result, stat
}
func (p *proxy) push(ctx tp.UnknownPushCtx) *tp.Status {
var (
label Label
settings = make([]tp.MessageSetting, 0, 16)
)
label.SessionID = ctx.Session().ID()
ctx.VisitMeta(func(key, value []byte) {
settings = append(settings, tp.WithAddMeta(string(key), string(value)))
})
if realIPBytes := ctx.PeekMeta(tp.MetaRealIP); len(realIPBytes) == 0 {
label.RealIP = ctx.IP()
settings = append(settings, tp.WithAddMeta(tp.MetaRealIP, label.RealIP))
} else {
label.RealIP = goutil.BytesToString(realIPBytes)
}
label.ServiceMethod = ctx.ServiceMethod()
stat := p.pushForwarder(&label).Push(label.ServiceMethod, ctx.InputBodyBytes(), settings...)
if !stat.OK() && stat.Code() < 200 && stat.Code() > 99 {
stat.SetCode(tp.CodeBadGateway)
stat.SetMsg(tp.CodeText(tp.CodeBadGateway))
}
return stat
}
var peerName = filepath.Base(os.Args[0])
var incr int64
var mutex sync.Mutex
// getSeq creates a new sequence with some prefix string.
func getSeq(prefix ...string) string {
mutex.Lock()
seq := fmt.Sprintf("%s[%d]", peerName, incr)
incr++
mutex.Unlock()
for _, p := range prefix {
p = strings.TrimSpace(p)
if p == "" {
continue
}
seq = p + ">" + seq
}
return seq
}