Some functioning network code
This commit is contained in:
Asim Aslam
parent
c3611aead2
commit
f619e46def
@ -44,15 +44,17 @@ type network struct {
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// lease generates a new lease with a node id/address
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// TODO: use a consensus mechanism, pool or some deterministic
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// unique prefixing method.
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// unique addressing method.
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func (n *network) lease() *pb.Lease {
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// create the id
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id := uuid.New().String()
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// create a timestamp
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now := time.Now().UnixNano()
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// create the address
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// create the address by hashing the id and timestamp
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h := sha256.New()
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h.Write([]byte(fmt.Sprintf("%s-%d\n", id, now)))
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// magic new address
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address := fmt.Sprintf("%x", h.Sum(nil))
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// return the node
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@ -62,6 +64,7 @@ func (n *network) lease() *pb.Lease {
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Node: &pb.Node{
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Id: id,
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Address: address,
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Network: n.id,
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},
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}
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}
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@ -104,7 +107,10 @@ func (n *network) Connect() (Node, error) {
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return newNode(n)
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}
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// TODO: establish links for peering networks
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// Peer is used to establish a link between two networks.
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// e.g micro.mu connects to example.com and share routes
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// This is done by creating a new node on both networks
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// and creating a link between them.
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func (n *network) Peer(Network) (Link, error) {
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// New network was created using NewNetwork after receiving routes from a different node
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@ -125,9 +131,13 @@ func (n *network) Peer(Network) (Link, error) {
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func newNetwork(opts ...options.Option) *network {
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options := options.NewOptions(opts...)
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// new network instance
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// new network instance with defaults
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net := &network{
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id: DefaultId,
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Options: options,
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id: DefaultId,
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router: router.DefaultRouter,
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proxy: new(mucp.Proxy),
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resolver: new(nreg.Resolver),
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}
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// get network id
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@ -140,24 +150,18 @@ func newNetwork(opts ...options.Option) *network {
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r, ok := options.Values().Get("network.router")
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if ok {
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net.router = r.(router.Router)
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} else {
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net.router = router.DefaultRouter
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}
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// get proxy
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p, ok := options.Values().Get("network.proxy")
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if ok {
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net.proxy = p.(proxy.Proxy)
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} else {
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net.proxy = new(mucp.Proxy)
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}
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// get resolver
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res, ok := options.Values().Get("network.resolver")
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if ok {
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net.resolver = res.(resolver.Resolver)
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} else {
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net.resolver = new(nreg.Resolver)
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}
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return net
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267
network/link.go
267
network/link.go
@ -1,30 +1,38 @@
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package network
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import (
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"errors"
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"fmt"
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"io"
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"sync"
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gproto "github.com/golang/protobuf/proto"
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"github.com/micro/go-micro/codec"
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pb "github.com/micro/go-micro/network/proto"
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"github.com/micro/go-micro/transport"
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)
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type link struct {
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// the embedded node
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*node
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sync.RWMutex
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// the link id
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id string
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// queue buffer for this link
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// the send queue to the socket
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queue chan *Message
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// codec we use to marshal things
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codec codec.Marshaler
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// the socket for this link
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socket *socket
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socket transport.Socket
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// the lease for this link
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lease *pb.Lease
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// length and weight of the link
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mtx sync.RWMutex
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// determines the cost of the link
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// based on queue length and roundtrip
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length int
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@ -33,25 +41,252 @@ type link struct {
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// link methods
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// bring up the link
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func (l *link) up() error {
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// TODO: manage the length/weight of the link
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return l.socket.accept()
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// process processe messages on the send queue
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func (l *link) process() {
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for {
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select {
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case m := <-l.queue:
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if err := l.send(m, nil); err != nil {
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return
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}
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}
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}
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}
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// kill the link
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func (l *link) down() error {
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return l.socket.close()
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// accept waits for the connect message from the remote end
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// if it receives anything else it throws an error
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func (l *link) accept() error {
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for {
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m := new(transport.Message)
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err := l.socket.Recv(m)
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if err == io.EOF {
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return nil
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}
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if err != nil {
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return err
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}
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// TODO: pick a reliable header
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event := m.Header["Micro-Method"]
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switch event {
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// connect event
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case "Connect":
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// process connect events from network.Connect()
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// these are new connections to join the network
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// decode the connection event
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conn := new(pb.Connect)
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if err := l.codec.Unmarshal(m.Body, conn); err != nil {
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// skip error
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continue
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}
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// get the existing lease if it exists
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lease := conn.Lease
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// if there's no lease create a new one
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if lease == nil {
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// create a new lease/node
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lease = l.node.network.lease()
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}
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// send back a lease offer for the node
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if err := l.send(&Message{
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Header: map[string]string{
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"Micro-Method": "Lease",
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},
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}, lease); err != nil {
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return err
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}
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// the lease is saved
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l.Lock()
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l.lease = lease
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l.Unlock()
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// we've connected
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// start processing the messages
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go l.process()
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return nil
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case "Close":
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l.Close()
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return errors.New("connection closed")
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default:
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return errors.New("unknown method: " + event)
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}
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}
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}
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// connect sends a connect request and waits on a lease.
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// this is for a new connection. in the event we send
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// an existing lease, the same lease should be returned.
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// if it differs then we assume our address for this link
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// is different...
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func (l *link) connect() error {
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// get the current lease
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l.RLock()
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lease := l.lease
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l.RUnlock()
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// send a lease request
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if err := l.send(&Message{
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Header: map[string]string{
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"Micro-Method": "Connect",
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},
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}, &pb.Connect{Lease: lease}); err != nil {
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return err
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}
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// create the new things
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tm := new(Message)
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newLease := new(pb.Lease)
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// wait for a response, hopefully a lease
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if err := l.recv(tm, newLease); err != nil {
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return err
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}
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event := tm.Header["Micro-Method"]
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// check the method
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switch event {
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case "Lease":
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// save the lease
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l.Lock()
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l.lease = newLease
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l.Unlock()
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// start processing the messages
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go l.process()
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case "Close":
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l.socket.Close()
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return errors.New("connection closed")
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default:
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return errors.New("unable to attain lease")
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}
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return nil
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}
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// send a message over the link
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func (l *link) send(m *Message, v interface{}) error {
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tm := new(transport.Message)
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tm.Header = m.Header
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tm.Body = m.Body
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// set the body if not nil
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// we're assuming this is network message
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if v != nil {
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// encode the data
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b, err := l.codec.Marshal(v)
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if err != nil {
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return err
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}
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// set the content type
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tm.Header["Content-Type"] = "application/protobuf"
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// set the marshalled body
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tm.Body = b
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}
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fmt.Printf("link %s sending %+v %+v\n", l.id, m, v)
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// send via the transport socket
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return l.socket.Send(&transport.Message{
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Header: m.Header,
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Body: m.Body,
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})
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}
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// recv a message on the link
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func (l *link) recv(m *Message, v interface{}) error {
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if m.Header == nil {
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m.Header = make(map[string]string)
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}
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tm := new(transport.Message)
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// receive the transport message
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if err := l.socket.Recv(tm); err != nil {
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return err
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}
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fmt.Printf("link %s receiving %+v %+v\n", l.id, tm, v)
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// set the message
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m.Header = tm.Header
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m.Body = tm.Body
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// bail early
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if v == nil {
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return nil
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}
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// try unmarshal the body
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// skip if there's no content-type
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if tm.Header["Content-Type"] != "application/protobuf" {
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return nil
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}
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// return unmarshalled
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return l.codec.Unmarshal(m.Body, v.(gproto.Message))
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}
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// Close the link
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func (l *link) Close() error {
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// send a final close message
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l.socket.Send(&transport.Message{
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Header: map[string]string{
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"Micro-Method": "Close",
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},
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})
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// close the socket
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return l.socket.Close()
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}
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// returns the node id
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func (l *link) Id() string {
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l.RLock()
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defer l.RUnlock()
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if l.lease == nil {
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return ""
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}
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return l.lease.Node.Id
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}
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// Address of the node we're connected to
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func (l *link) Address() string {
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l.RLock()
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defer l.RUnlock()
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if l.lease == nil {
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return l.socket.Remote()
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}
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// the node in the lease
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return l.lease.Node.Address
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}
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func (l *link) Length() int {
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l.mtx.RLock()
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defer l.mtx.RUnlock()
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l.RLock()
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defer l.RUnlock()
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return l.length
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}
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func (l *link) Weight() int {
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l.mtx.RLock()
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defer l.mtx.RUnlock()
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l.RLock()
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defer l.RUnlock()
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return l.weight
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}
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func (l *link) Accept() (*Message, error) {
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m := new(Message)
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err := l.recv(m, nil)
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if err != nil {
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return nil, err
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}
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return m, nil
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}
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func (l *link) Send(m *Message) error {
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return l.send(m, nil)
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}
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313
network/node.go
313
network/node.go
@ -1,7 +1,11 @@
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package network
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import (
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"errors"
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"fmt"
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"net"
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"runtime/debug"
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"strconv"
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"sync"
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"time"
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@ -9,6 +13,7 @@ import (
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"github.com/micro/go-micro/codec/proto"
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"github.com/micro/go-micro/registry"
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"github.com/micro/go-micro/transport"
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"github.com/micro/go-micro/util/addr"
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"github.com/micro/go-micro/util/log"
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pb "github.com/micro/go-micro/network/proto"
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@ -20,7 +25,7 @@ type node struct {
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// closed channel
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closed chan bool
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mtx sync.RWMutex
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sync.RWMutex
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// the node id
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id string
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@ -40,32 +45,46 @@ type node struct {
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// leases for connections to us
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// link id:link
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links map[string]*link
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// messages received over links
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recv chan *Message
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// messages received over links
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send chan *Message
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}
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// network methods
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func newNode(n *network) (*node, error) {
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// create a new node
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node := new(node)
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// closed channel
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node.closed = make(chan bool)
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// set the nodes network
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node.network = n
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// initially we have no id
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// create an id and address
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// TODO: create a real unique id and address
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// lease := n.lease()
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// set the node id
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// node.id = lease.Node.Id
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node := &node{
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// the links
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links: make(map[string]*link),
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// closed channel
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closed: make(chan bool),
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// set the nodes network
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network: n,
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// set the default transport
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transport: transport.DefaultTransport,
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// set the default registry
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registry: registry.DefaultRegistry,
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// receive channel for accepted connections
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recv: make(chan *Message, 128),
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// send channel for accepted connections
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send: make(chan *Message, 128),
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}
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// get the transport we're going to use for our tunnels
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// TODO: set to quic or tunnel or something else
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t, ok := n.Options.Values().Get("network.transport")
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if ok {
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node.transport = t.(transport.Transport)
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} else {
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// TODO: set to quic
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node.transport = transport.DefaultTransport
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}
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// register the node with the registry for the network
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// TODO: use a registrar or something else for local things
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r, ok := n.Options.Values().Get("network.registry")
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if ok {
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node.registry = r.(registry.Registry)
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}
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// we listen on a random address, this is not advertised
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@ -77,8 +96,6 @@ func newNode(n *network) (*node, error) {
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// set the listener
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node.listener = l
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// TODO: this should be an overlay address
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// ideally received via some dhcp style broadcast
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node.address = l.Addr()
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// TODO: start the router and broadcast advertisements
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@ -90,36 +107,51 @@ func newNode(n *network) (*node, error) {
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// process any incoming messages on the listener
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// this is our inbound network connection
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node.accept(l)
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go node.accept(l)
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// register the node with the registry for the network
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// TODO: use a registrar or something else for local things
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r, ok := n.Options.Values().Get("network.registry")
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if ok {
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node.registry = r.(registry.Registry)
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} else {
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node.registry = registry.DefaultRegistry
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}
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// process any messages being sent by node.Send
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// forwards to every link we have
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go node.process()
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// lookup the network to see if there's any nodes
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records := n.lookup(node.registry)
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// should we actually do this?
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// assuming if there are no records, we are the first
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// we set ourselves a lease. should we actually do this?
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if len(records) == 0 {
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// set your own node id
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lease := n.lease()
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node.id = lease.Node.Id
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}
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// register self with the network registry
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var port int
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// TODO: this should be an overlay address
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// ideally received via some dhcp style broadcast
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host, pp, err := net.SplitHostPort(l.Addr())
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if err == nil {
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pt, _ := strconv.Atoi(pp)
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port = pt
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}
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// some horrible things are happening
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if host == "::" {
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host = ""
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}
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// set the address
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addr, _ := addr.Extract(host)
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node.address = fmt.Sprintf("%s:%d", addr, port)
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// register self with the registry using network: prefix
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// this is a local registry of nodes separate to the resolver
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// maybe consolidate registry/resolver
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// TODO: find a way to do this via gossip or something else
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// TODO: find a way to do this via gossip or something like
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// a registrar or tld or whatever
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if err := node.registry.Register(®istry.Service{
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// register with the network id
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Name: "network:" + n.Id(),
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Nodes: []*registry.Node{
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{Id: node.id, Address: node.address},
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{Id: node.id, Address: addr, Port: port},
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},
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}); err != nil {
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node.Close()
|
||||
@ -134,7 +166,20 @@ func newNode(n *network) (*node, error) {
|
||||
|
||||
// wait forever to connect
|
||||
// TODO: do something with the links we receive
|
||||
<-linkChan
|
||||
link := <-linkChan
|
||||
|
||||
// process this link
|
||||
go node.manage(link)
|
||||
|
||||
go func() {
|
||||
// process any further new links
|
||||
select {
|
||||
case l := <-linkChan:
|
||||
go node.manage(l)
|
||||
case <-node.closed:
|
||||
return
|
||||
}
|
||||
}()
|
||||
|
||||
return node, nil
|
||||
}
|
||||
@ -158,28 +203,82 @@ func (n *node) accept(l transport.Listener) error {
|
||||
}()
|
||||
|
||||
// create a new link
|
||||
// generate a new link
|
||||
link := &link{
|
||||
// link has a unique id
|
||||
id: uuid.New().String(),
|
||||
// proto marshaler
|
||||
codec: proto.Marshaler{},
|
||||
// link has a socket
|
||||
socket: sock,
|
||||
// for generating leases,
|
||||
node: n,
|
||||
id: uuid.New().String(),
|
||||
// the send queue,
|
||||
queue: make(chan *Message, 128),
|
||||
}
|
||||
// create a new network socket
|
||||
sk := new(socket)
|
||||
sk.node = n
|
||||
sk.codec = proto.Marshaler{}
|
||||
sk.socket = sock
|
||||
|
||||
// set link socket
|
||||
link.socket = sk
|
||||
log.Debugf("Accepting connection from %s", link.socket.Remote())
|
||||
|
||||
// accept messages on the socket
|
||||
// blocks forever or until error
|
||||
if err := link.up(); err != nil {
|
||||
// TODO: delete link
|
||||
// wait for the link to be connected
|
||||
// the remote end will send "Connect"
|
||||
// and we will return a "Lease"
|
||||
if err := link.accept(); err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
log.Debugf("Accepted link from %s", link.socket.Remote())
|
||||
|
||||
// save with the remote address as the key
|
||||
// where we attempt to connect to nodes
|
||||
// we do not connect to the same thing
|
||||
n.Lock()
|
||||
n.links[link.socket.Remote()] = link
|
||||
n.Unlock()
|
||||
|
||||
// manage the link for its lifetime
|
||||
n.manage(link)
|
||||
})
|
||||
}
|
||||
|
||||
// processes the send queue
|
||||
func (n *node) process() {
|
||||
for {
|
||||
select {
|
||||
case <-n.closed:
|
||||
return
|
||||
// process outbound messages on the send queue
|
||||
// these messages are received from n.Send
|
||||
case m := <-n.send:
|
||||
// queue the message on each link
|
||||
// TODO: more than likely use proxy
|
||||
n.RLock()
|
||||
for _, l := range n.links {
|
||||
l.queue <- m
|
||||
}
|
||||
n.RUnlock()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (n *node) manage(l *link) {
|
||||
// now process inbound messages on the link
|
||||
// assumption is this handles everything else
|
||||
for {
|
||||
// get a message on the link
|
||||
m := new(Message)
|
||||
if err := l.recv(m, nil); err != nil {
|
||||
// ???
|
||||
return
|
||||
}
|
||||
|
||||
select {
|
||||
case <-n.closed:
|
||||
return
|
||||
// send to the recv channel e.g node.Accept()
|
||||
case n.recv <- m:
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// connect attempts to periodically connect to new nodes in the network.
|
||||
// It will only do this if it has less than 3 connections. this method
|
||||
// is called by network.Connect and fired in a go routine after establishing
|
||||
@ -188,30 +287,37 @@ func (n *node) accept(l transport.Listener) error {
|
||||
func (n *node) connect(linkChan chan *link) {
|
||||
// TODO: adjustable ticker
|
||||
t := time.NewTicker(time.Second)
|
||||
|
||||
var lease *pb.Lease
|
||||
|
||||
for {
|
||||
select {
|
||||
// exit when told to do so
|
||||
case <-n.closed:
|
||||
return
|
||||
// on every tick check the number of links and then attempt
|
||||
// to connect to new nodes if we don't have sufficient links
|
||||
case <-t.C:
|
||||
n.mtx.RLock()
|
||||
n.RLock()
|
||||
|
||||
// only start processing if we have less than 3 links
|
||||
if len(n.links) > 2 {
|
||||
n.mtx.RUnlock()
|
||||
n.RUnlock()
|
||||
continue
|
||||
}
|
||||
|
||||
// get a list of link addresses so we don't reconnect
|
||||
// to the ones we're already connected to
|
||||
nodes := map[string]bool{}
|
||||
for _, l := range n.links {
|
||||
nodes[l.lease.Node.Address] = true
|
||||
for addr, _ := range n.links {
|
||||
// id is the lookup address used to connect
|
||||
nodes[addr] = true
|
||||
}
|
||||
|
||||
n.mtx.RUnlock()
|
||||
// unlock our read lock
|
||||
n.RUnlock()
|
||||
|
||||
// lookup records for our network
|
||||
records := n.network.lookup(n.registry)
|
||||
|
||||
// for each record check we haven't already got a connection
|
||||
@ -224,53 +330,53 @@ func (n *node) connect(linkChan chan *link) {
|
||||
for _, record := range records {
|
||||
// skip existing connections
|
||||
if nodes[record.Address] {
|
||||
log.Debugf("Skipping connection to %s", record.Address)
|
||||
continue
|
||||
}
|
||||
|
||||
// attempt to connect and create a link
|
||||
|
||||
log.Debugf("Dialing connection to %s", record.Address)
|
||||
|
||||
// connect to the node
|
||||
s, err := n.transport.Dial(record.Address)
|
||||
sock, err := n.transport.Dial(record.Address)
|
||||
if err != nil {
|
||||
log.Debugf("Dialing connection error %v", err)
|
||||
continue
|
||||
}
|
||||
|
||||
// create a new socket
|
||||
sk := &socket{
|
||||
node: n,
|
||||
codec: &proto.Marshaler{},
|
||||
socket: s,
|
||||
}
|
||||
|
||||
// broadcast a "connect" request and get back "lease"
|
||||
// this is your tunnel to the outside world and to the network
|
||||
// then push updates and messages over this link
|
||||
// first connect will not have a lease so we get one with node id/address
|
||||
l, err := sk.connect(lease)
|
||||
if err != nil {
|
||||
s.Close()
|
||||
continue
|
||||
}
|
||||
|
||||
// set lease for next time
|
||||
lease = l
|
||||
|
||||
// create a new link with the lease and socket
|
||||
link := &link{
|
||||
codec: &proto.Marshaler{},
|
||||
id: uuid.New().String(),
|
||||
lease: lease,
|
||||
node: n,
|
||||
socket: sock,
|
||||
queue: make(chan *Message, 128),
|
||||
socket: sk,
|
||||
}
|
||||
|
||||
// bring up the link
|
||||
go link.up()
|
||||
log.Debugf("Connecting link to %s", record.Address)
|
||||
|
||||
// connect the link:
|
||||
// this broadcasts a "connect" request and gets back a "lease"
|
||||
// this is the tunnel to the outside world and to the network
|
||||
// then push updates and messages over this link
|
||||
// first connect will not have a lease so we get one with node id/address
|
||||
if err := link.connect(); err != nil {
|
||||
// shit
|
||||
link.Close()
|
||||
continue
|
||||
}
|
||||
|
||||
log.Debugf("Connected link to %s", record.Address)
|
||||
|
||||
n.Lock()
|
||||
// set lease for next time we connect to anything else
|
||||
// we want to use the same lease for that. in future
|
||||
// we may have to expire the lease
|
||||
lease = link.lease
|
||||
// save the new link
|
||||
n.mtx.Lock()
|
||||
n.links[link.id] = link
|
||||
n.mtx.Unlock()
|
||||
n.links[link.socket.Remote()] = link
|
||||
n.Unlock()
|
||||
|
||||
// drop this down the link channel to the network
|
||||
// so it can manage the links
|
||||
@ -280,8 +386,6 @@ func (n *node) connect(linkChan chan *link) {
|
||||
default:
|
||||
}
|
||||
}
|
||||
case <-n.closed:
|
||||
return
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -296,14 +400,17 @@ func (n *node) Close() error {
|
||||
case <-n.closed:
|
||||
return nil
|
||||
default:
|
||||
// mark as closed
|
||||
close(n.closed)
|
||||
|
||||
// shutdown all the links
|
||||
n.mtx.Lock()
|
||||
n.Lock()
|
||||
for id, link := range n.links {
|
||||
link.down()
|
||||
link.Close()
|
||||
delete(n.links, id)
|
||||
}
|
||||
n.mtx.Unlock()
|
||||
n.Unlock()
|
||||
|
||||
// deregister self
|
||||
n.registry.Deregister(®istry.Service{
|
||||
Name: "network:" + n.network.Id(),
|
||||
@ -311,14 +418,29 @@ func (n *node) Close() error {
|
||||
{Id: n.id, Address: n.address},
|
||||
},
|
||||
})
|
||||
|
||||
// shutdown the listener
|
||||
return n.listener.Close()
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// Accept receives the incoming messages from all links
|
||||
func (n *node) Accept() (*Message, error) {
|
||||
// process the inbound cruft
|
||||
|
||||
for {
|
||||
select {
|
||||
case m, ok := <-n.recv:
|
||||
if !ok {
|
||||
return nil, errors.New("connection closed")
|
||||
}
|
||||
// return the message
|
||||
return m, nil
|
||||
case <-n.closed:
|
||||
return nil, errors.New("connection closed")
|
||||
}
|
||||
}
|
||||
// we never get here
|
||||
return nil, nil
|
||||
}
|
||||
|
||||
@ -326,22 +448,13 @@ func (n *node) Network() string {
|
||||
return n.network.id
|
||||
}
|
||||
|
||||
// Send propagates a message over all links. This should probably use its proxy.
|
||||
func (n *node) Send(m *Message) error {
|
||||
n.mtx.RLock()
|
||||
defer n.mtx.RUnlock()
|
||||
|
||||
var gerr error
|
||||
|
||||
// send to all links
|
||||
// TODO: be smarter
|
||||
for _, link := range n.links {
|
||||
// TODO: process the error, do some link flap detection
|
||||
// blackhole the connection, etc
|
||||
if err := link.socket.send(m, nil); err != nil {
|
||||
gerr = err
|
||||
continue
|
||||
}
|
||||
select {
|
||||
case <-n.closed:
|
||||
return errors.New("connection closed")
|
||||
case n.send <- m:
|
||||
// send the message
|
||||
}
|
||||
|
||||
return gerr
|
||||
return nil
|
||||
}
|
||||
|
||||
@ -2,6 +2,8 @@
|
||||
package registry
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
|
||||
"github.com/micro/go-micro/network/resolver"
|
||||
"github.com/micro/go-micro/registry"
|
||||
)
|
||||
@ -27,8 +29,13 @@ func (r *Resolver) Resolve(id string) ([]*resolver.Record, error) {
|
||||
|
||||
for _, service := range services {
|
||||
for _, node := range service.Nodes {
|
||||
addr := node.Address
|
||||
// such a hack
|
||||
if node.Port > 0 {
|
||||
addr = fmt.Sprintf("%s:%d", node.Address, node.Port)
|
||||
}
|
||||
records = append(records, &resolver.Record{
|
||||
Address: node.Address,
|
||||
Address: addr,
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
@ -1,176 +0,0 @@
|
||||
package network
|
||||
|
||||
import (
|
||||
"io"
|
||||
|
||||
gproto "github.com/golang/protobuf/proto"
|
||||
"github.com/google/uuid"
|
||||
"github.com/micro/go-micro/codec"
|
||||
"github.com/micro/go-micro/transport"
|
||||
|
||||
pb "github.com/micro/go-micro/network/proto"
|
||||
)
|
||||
|
||||
type socket struct {
|
||||
node *node
|
||||
codec codec.Marshaler
|
||||
socket transport.Socket
|
||||
}
|
||||
|
||||
func (s *socket) close() error {
|
||||
return s.socket.Close()
|
||||
}
|
||||
|
||||
// accept is the state machine that processes messages on the socket
|
||||
func (s *socket) accept() error {
|
||||
for {
|
||||
m := new(transport.Message)
|
||||
err := s.socket.Recv(m)
|
||||
if err == io.EOF {
|
||||
return nil
|
||||
}
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// TODO: pick a reliable header
|
||||
event := m.Header["Micro-Method"]
|
||||
|
||||
switch event {
|
||||
// connect event
|
||||
case "connect":
|
||||
// process connect events from network.Connect()
|
||||
// these are new connections to join the network
|
||||
|
||||
// decode the connection event
|
||||
conn := new(pb.Connect)
|
||||
if err := s.codec.Unmarshal(m.Body, conn); err != nil {
|
||||
// skip error
|
||||
continue
|
||||
}
|
||||
|
||||
// get the existing lease if it exists
|
||||
lease := conn.Lease
|
||||
if lease == nil {
|
||||
// create a new lease/node
|
||||
lease = s.node.network.lease()
|
||||
}
|
||||
|
||||
// send back a lease offer for the node
|
||||
if err := s.send(&Message{
|
||||
Header: map[string]string{
|
||||
"Micro-Method": "lease",
|
||||
},
|
||||
}, lease); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// record this mapping of socket to node/lease
|
||||
s.node.mtx.Lock()
|
||||
id := uuid.New().String()
|
||||
s.node.links[id] = &link{
|
||||
node: s.node,
|
||||
id: id,
|
||||
lease: lease,
|
||||
queue: make(chan *Message, 128),
|
||||
socket: s,
|
||||
}
|
||||
s.node.mtx.Unlock()
|
||||
// a route update
|
||||
case "route":
|
||||
// process router events
|
||||
|
||||
// received a lease
|
||||
case "lease":
|
||||
// no op as we don't process lease events on existing connections
|
||||
// these are in response to a connect message
|
||||
default:
|
||||
// process all other messages
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// connect sends a connect request and waits on a lease.
|
||||
// this is for a new connection. in the event we send
|
||||
// an existing lease, the same lease should be returned.
|
||||
// if it differs then we assume our address for this link
|
||||
// is different...
|
||||
func (s *socket) connect(l *pb.Lease) (*pb.Lease, error) {
|
||||
// send a lease request
|
||||
if err := s.send(&Message{
|
||||
Header: map[string]string{
|
||||
"Micro-Method": "connect",
|
||||
},
|
||||
}, &pb.Connect{Lease: l}); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// create the new things
|
||||
tm := new(Message)
|
||||
lease := new(pb.Lease)
|
||||
|
||||
// wait for a lease response
|
||||
if err := s.recv(tm, lease); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return lease, nil
|
||||
}
|
||||
|
||||
func (s *socket) send(m *Message, v interface{}) error {
|
||||
tm := new(transport.Message)
|
||||
tm.Header = m.Header
|
||||
tm.Body = m.Body
|
||||
|
||||
// set the body if not nil
|
||||
// we're assuming this is network message
|
||||
if v != nil {
|
||||
// encode the data
|
||||
b, err := s.codec.Marshal(v)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// set the content type
|
||||
tm.Header["Content-Type"] = "application/protobuf"
|
||||
// set the marshalled body
|
||||
tm.Body = b
|
||||
}
|
||||
|
||||
// send via the transport socket
|
||||
return s.socket.Send(&transport.Message{
|
||||
Header: m.Header,
|
||||
Body: m.Body,
|
||||
})
|
||||
}
|
||||
|
||||
func (s *socket) recv(m *Message, v interface{}) error {
|
||||
if m.Header == nil {
|
||||
m.Header = make(map[string]string)
|
||||
}
|
||||
|
||||
tm := new(transport.Message)
|
||||
|
||||
// receive the transport message
|
||||
if err := s.socket.Recv(tm); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// set the message
|
||||
m.Header = tm.Header
|
||||
m.Body = tm.Body
|
||||
|
||||
// bail early
|
||||
if v == nil {
|
||||
return nil
|
||||
}
|
||||
|
||||
// try unmarshal the body
|
||||
// skip if there's no content-type
|
||||
if tm.Header["Content-Type"] != "application/protobuf" {
|
||||
return nil
|
||||
}
|
||||
|
||||
// return unmarshalled
|
||||
return s.codec.Unmarshal(m.Body, v.(gproto.Message))
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user