Move proxy/router
This commit is contained in:
Asim Aslam
@@ -1,337 +0,0 @@
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package tunnel
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import (
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"crypto/sha256"
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"errors"
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"fmt"
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"sync"
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"github.com/google/uuid"
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"github.com/micro/go-micro/network/link"
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"github.com/micro/go-micro/transport"
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)
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// tun represents a network tunnel
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type tun struct {
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// the link on top of which we build a tunnel
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link link.Link
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sync.RWMutex
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// to indicate if we're connected or not
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connected bool
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// the send channel for all messages
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send chan *message
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// close channel
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closed chan bool
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// a map of sockets based on Micro-Tunnel-Id
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sockets map[string]*socket
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}
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// create new tunnel on top of a link
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func newTunnel(link link.Link) *tun {
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return &tun{
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link: link,
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send: make(chan *message, 128),
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closed: make(chan bool),
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sockets: make(map[string]*socket),
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}
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}
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// getSocket returns a socket from the internal socket map.
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// It does this based on the Micro-Tunnel-Id and Micro-Tunnel-Session
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func (t *tun) getSocket(id, session string) (*socket, bool) {
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// get the socket
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t.RLock()
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s, ok := t.sockets[id+session]
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t.RUnlock()
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return s, ok
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}
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// newSocket creates a new socket and saves it
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func (t *tun) newSocket(id, session string) (*socket, bool) {
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// hash the id
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h := sha256.New()
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h.Write([]byte(id))
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id = fmt.Sprintf("%x", h.Sum(nil))
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// new socket
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s := &socket{
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id: id,
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session: session,
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closed: make(chan bool),
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recv: make(chan *message, 128),
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send: t.send,
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wait: make(chan bool),
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}
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// save socket
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t.Lock()
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_, ok := t.sockets[id+session]
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if ok {
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// socket already exists
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t.Unlock()
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return nil, false
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}
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t.sockets[id+session] = s
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t.Unlock()
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// return socket
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return s, true
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}
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// TODO: use tunnel id as part of the session
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func (t *tun) newSession() string {
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return uuid.New().String()
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}
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// process outgoing messages sent by all local sockets
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func (t *tun) process() {
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// manage the send buffer
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// all pseudo sockets throw everything down this
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for {
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select {
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case msg := <-t.send:
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nmsg := &transport.Message{
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Header: msg.data.Header,
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Body: msg.data.Body,
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}
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// set the tunnel id on the outgoing message
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nmsg.Header["Micro-Tunnel-Id"] = msg.id
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// set the session id
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nmsg.Header["Micro-Tunnel-Session"] = msg.session
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// send the message via the interface
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if err := t.link.Send(nmsg); err != nil {
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// no op
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// TODO: do something
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}
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case <-t.closed:
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return
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}
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}
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}
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// process incoming messages
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func (t *tun) listen() {
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for {
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// process anything via the net interface
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msg := new(transport.Message)
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err := t.link.Recv(msg)
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if err != nil {
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return
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}
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// first check Micro-Tunnel
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switch msg.Header["Micro-Tunnel"] {
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case "connect":
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// assuming new connection
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// TODO: do something with this
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continue
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case "close":
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// assuming connection closed
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// TODO: do something with this
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continue
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}
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// the tunnel id
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id := msg.Header["Micro-Tunnel-Id"]
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// the session id
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session := msg.Header["Micro-Tunnel-Session"]
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// if the session id is blank there's nothing we can do
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// TODO: check this is the case, is there any reason
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// why we'd have a blank session? Is the tunnel
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// used for some other purpose?
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if len(id) == 0 || len(session) == 0 {
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continue
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}
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// get the socket based on the tunnel id and session
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// this could be something we dialed in which case
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// we have a session for it otherwise its a listener
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s, exists := t.getSocket(id, session)
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if !exists {
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// try get it based on just the tunnel id
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// the assumption here is that a listener
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// has no session but its set a listener session
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s, exists = t.getSocket(id, "listener")
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if !exists {
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// drop it, we don't care about
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// messages we don't know about
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continue
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}
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}
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// is the socket closed?
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select {
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case <-s.closed:
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// closed
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delete(t.sockets, id)
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continue
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default:
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// process
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}
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// is the socket new?
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select {
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// if its new the socket is actually blocked waiting
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// for a connection. so we check if its waiting.
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case <-s.wait:
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// if its waiting e.g its new then we close it
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default:
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// set remote address of the socket
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s.remote = msg.Header["Remote"]
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close(s.wait)
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}
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// construct a new transport message
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tmsg := &transport.Message{
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Header: msg.Header,
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Body: msg.Body,
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}
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// construct the internal message
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imsg := &message{
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id: id,
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session: session,
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data: tmsg,
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}
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// append to recv backlog
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// we don't block if we can't pass it on
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select {
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case s.recv <- imsg:
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default:
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}
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}
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}
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func (t *tun) connect() error {
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return t.link.Send(&transport.Message{
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Header: map[string]string{
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"Micro-Tunnel": "connect",
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},
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})
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}
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func (t *tun) close() error {
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return t.link.Send(&transport.Message{
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Header: map[string]string{
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"Micro-Tunnel": "close",
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},
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})
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}
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// Close the tunnel
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func (t *tun) Close() error {
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t.Lock()
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defer t.Unlock()
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if !t.connected {
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return nil
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}
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select {
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case <-t.closed:
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return nil
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default:
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// close all the sockets
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for _, s := range t.sockets {
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s.Close()
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}
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// close the connection
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close(t.closed)
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t.connected = false
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// send a close message
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// we don't close the link
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// just the tunnel
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return t.close()
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}
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return nil
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}
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// Connect the tunnel
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func (t *tun) Connect() error {
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t.Lock()
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defer t.Unlock()
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// already connected
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if t.connected {
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return nil
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}
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// send the connect message
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if err := t.connect(); err != nil {
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return err
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}
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// set as connected
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t.connected = true
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// create new close channel
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t.closed = make(chan bool)
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// process messages to be sent
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go t.process()
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// process incoming messages
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go t.listen()
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return nil
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}
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// Dial an address
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func (t *tun) Dial(addr string) (Conn, error) {
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c, ok := t.newSocket(addr, t.newSession())
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if !ok {
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return nil, errors.New("error dialing " + addr)
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}
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// set remote
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c.remote = addr
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// set local
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c.local = t.link.Local()
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return c, nil
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}
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// Accept a connection on the address
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func (t *tun) Listen(addr string) (Listener, error) {
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// create a new socket by hashing the address
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c, ok := t.newSocket(addr, "listener")
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if !ok {
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return nil, errors.New("already listening on " + addr)
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}
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// set remote. it will be replaced by the first message received
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c.remote = t.link.Remote()
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// set local
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c.local = addr
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tl := &tunListener{
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addr: addr,
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// the accept channel
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accept: make(chan *socket, 128),
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// the channel to close
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closed: make(chan bool),
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// the connection
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conn: c,
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// the listener socket
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socket: c,
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}
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// this kicks off the internal message processor
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// for the listener so it can create pseudo sockets
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// per session if they do not exist or pass messages
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// to the existign sessions
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go tl.process()
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// return the listener
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return tl, nil
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}
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@@ -1,101 +0,0 @@
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package tunnel
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import (
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"io"
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)
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type tunListener struct {
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// address of the listener
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addr string
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// the accept channel
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accept chan *socket
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// the channel to close
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closed chan bool
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// the connection
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conn Conn
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// the listener socket
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socket *socket
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}
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func (t *tunListener) process() {
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// our connection map for session
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conns := make(map[string]*socket)
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for {
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select {
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case <-t.closed:
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return
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// receive a new message
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case m := <-t.socket.recv:
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// get a socket
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sock, ok := conns[m.session]
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if !ok {
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// create a new socket session
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sock = &socket{
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// our tunnel id
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id: m.id,
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// the session id
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session: m.session,
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// close chan
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closed: make(chan bool),
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// recv called by the acceptor
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recv: make(chan *message, 128),
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// use the internal send buffer
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send: t.socket.send,
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// wait
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wait: make(chan bool),
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}
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// first message
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sock.recv <- m
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// save the socket
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conns[m.session] = sock
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// send to accept chan
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select {
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case <-t.closed:
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return
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case t.accept <- sock:
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}
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}
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// send this to the accept chan
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select {
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case <-sock.closed:
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delete(conns, m.session)
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case sock.recv <- m:
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}
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}
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}
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}
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func (t *tunListener) Addr() string {
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return t.addr
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}
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func (t *tunListener) Close() error {
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select {
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case <-t.closed:
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return nil
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default:
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close(t.closed)
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}
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return nil
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}
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// Everytime accept is called we essentially block till we get a new connection
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func (t *tunListener) Accept() (Conn, error) {
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select {
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// if the socket is closed return
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case <-t.closed:
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return nil, io.EOF
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// wait for a new connection
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case c, ok := <-t.accept:
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if !ok {
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return nil, io.EOF
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}
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return c, nil
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}
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return nil, nil
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}
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@@ -1,90 +0,0 @@
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package tunnel
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import (
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"errors"
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"github.com/micro/go-micro/transport"
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)
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// socket is our pseudo socket for transport.Socket
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type socket struct {
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// socket id based on Micro-Tunnel
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id string
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// the session id based on Micro.Tunnel-Session
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session string
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// closed
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closed chan bool
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// remote addr
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remote string
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// local addr
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local string
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// send chan
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send chan *message
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// recv chan
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recv chan *message
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// wait until we have a connection
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wait chan bool
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}
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// message is sent over the send channel
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type message struct {
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// tunnel id
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id string
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// the session id
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session string
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// transport data
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data *transport.Message
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}
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func (s *socket) Remote() string {
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return s.remote
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}
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func (s *socket) Local() string {
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return s.local
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}
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func (s *socket) Id() string {
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return s.id
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}
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func (s *socket) Session() string {
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return s.session
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}
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func (s *socket) Send(m *transport.Message) error {
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select {
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case <-s.closed:
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return errors.New("socket is closed")
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default:
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// no op
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}
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// append to backlog
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s.send <- &message{id: s.id, session: s.session, data: m}
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return nil
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}
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func (s *socket) Recv(m *transport.Message) error {
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select {
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case <-s.closed:
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return errors.New("socket is closed")
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default:
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// no op
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||||
}
|
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// recv from backlog
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msg := <-s.recv
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// set message
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*m = *msg.data
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// return nil
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return nil
|
||||
}
|
||||
|
||||
func (s *socket) Close() error {
|
||||
select {
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||||
case <-s.closed:
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// no op
|
||||
default:
|
||||
close(s.closed)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
@@ -1,44 +0,0 @@
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// Package tunnel provides gre network tunnelling
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package tunnel
|
||||
|
||||
import (
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||||
"github.com/micro/go-micro/network/link"
|
||||
"github.com/micro/go-micro/transport"
|
||||
)
|
||||
|
||||
// Tunnel creates a gre network tunnel on top of a link.
|
||||
// It establishes multiple streams using the Micro-Tunnel-Id header
|
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// and Micro-Tunnel-Session header. The tunnel id is a hash of
|
||||
// the address being requested.
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||||
type Tunnel interface {
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||||
// Connect connects the tunnel
|
||||
Connect() error
|
||||
// Close closes the tunnel
|
||||
Close() error
|
||||
// Dial an endpoint
|
||||
Dial(addr string) (Conn, error)
|
||||
// Accept connections
|
||||
Listen(addr string) (Listener, error)
|
||||
}
|
||||
|
||||
// The listener provides similar constructs to the transport.Listener
|
||||
type Listener interface {
|
||||
Addr() string
|
||||
Close() error
|
||||
Accept() (Conn, error)
|
||||
}
|
||||
|
||||
// Conn is a connection dialed or accepted which includes the tunnel id and session
|
||||
type Conn interface {
|
||||
// Specifies the tunnel id
|
||||
Id() string
|
||||
// The session
|
||||
Session() string
|
||||
// a transport socket
|
||||
transport.Socket
|
||||
}
|
||||
|
||||
// NewTunnel creates a new tunnel on top of a link
|
||||
func NewTunnel(l link.Link) Tunnel {
|
||||
return newTunnel(l)
|
||||
}
|
||||
@@ -1,113 +0,0 @@
|
||||
package tunnel
|
||||
|
||||
import (
|
||||
"testing"
|
||||
|
||||
"github.com/micro/go-micro/network/link"
|
||||
"github.com/micro/go-micro/transport"
|
||||
)
|
||||
|
||||
// testAccept will accept connections on the transport, create a new link and tunnel on top
|
||||
func testAccept(t *testing.T, l transport.Listener, wait chan bool) error {
|
||||
// accept new connections on the transport
|
||||
// establish a link and tunnel
|
||||
return l.Accept(func(s transport.Socket) {
|
||||
// convert the socket into a link
|
||||
li := link.NewLink(
|
||||
link.Socket(s),
|
||||
)
|
||||
|
||||
// connect the link e.g start internal buffers
|
||||
if err := li.Connect(); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
// create a new tunnel
|
||||
tun := NewTunnel(li)
|
||||
|
||||
// connect the tunnel
|
||||
if err := tun.Connect(); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
// listen on some virtual address
|
||||
tl, err := tun.Listen("test-tunnel")
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
return
|
||||
}
|
||||
|
||||
// accept a connection
|
||||
c, err := tl.Accept()
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
// get a message
|
||||
for {
|
||||
m := new(transport.Message)
|
||||
if err := c.Recv(m); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
close(wait)
|
||||
return
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
// testSend will create a new link to an address and then a tunnel on top
|
||||
func testSend(t *testing.T, addr string) {
|
||||
// create a new link
|
||||
l := link.NewLink(
|
||||
link.Address(addr),
|
||||
)
|
||||
|
||||
// connect the link, this includes dialing
|
||||
if err := l.Connect(); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
// create a tunnel on the link
|
||||
tun := NewTunnel(l)
|
||||
|
||||
// connect the tunnel with the remote side
|
||||
if err := tun.Connect(); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
// dial a new session
|
||||
c, err := tun.Dial("test-tunnel")
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
m := transport.Message{
|
||||
Header: map[string]string{
|
||||
"test": "header",
|
||||
},
|
||||
}
|
||||
if err := c.Send(&m); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
}
|
||||
|
||||
func TestTunnel(t *testing.T) {
|
||||
// create a new listener
|
||||
tr := transport.NewTransport()
|
||||
l, err := tr.Listen(":0")
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
defer l.Close()
|
||||
|
||||
wait := make(chan bool)
|
||||
|
||||
// start accepting connections
|
||||
go testAccept(t, l, wait)
|
||||
|
||||
// send a message
|
||||
testSend(t, l.Addr())
|
||||
|
||||
// wait until message is received
|
||||
<-wait
|
||||
}
|
||||
Reference in New Issue
Block a user