func (t *transport) handlePing(ch *e3x.Channel) {
var (
err error
pkt *lob.Packet
id string
alive bool
)
defer ch.Close()
pkt, err = ch.ReadPacket()
if err != nil {
// log error
// tracef("error: %s", err)
return
}
id, _ = pkt.Header().GetString("vn")
rpc := t.lookupRPC(id)
if rpc == nil {
alive = false
} else {
alive = true
}
pkt = &lob.Packet{}
pkt.Header().SetBool("alive", alive)
err = ch.WritePacket(pkt)
if err != nil {
// log error
// tracef("error: %s", err)
return
}
}
func (t *transport) handleSkipSuccessor(ch *e3x.Channel) {
var (
err error
stream io.ReadWriteCloser
req struct {
Target string
Self *completeVnode
}
)
defer ch.Close()
stream = newStream(ch)
err = json.NewDecoder(stream).Decode(&req)
if err != nil {
// log
// tracef("(SkipSuccessor) error: %s", err)
return
}
rpc := t.lookupRPC(req.Target)
if rpc == nil {
// log
// tracef("(SkipSuccessor) error: %s", "no RPC")
return
}
err = rpc.SkipSuccessor(t.internalVnode(req.Self))
if err != nil {
// log
// tracef("(SkipSuccessor) error: %s", err)
return
}
}
func (t *transport) handleListVnodes(ch *e3x.Channel) {
var (
err error
res []*completeVnode
)
defer ch.Close()
_, err = ch.ReadPacket()
if err != nil {
// log error
// tracef("error: %s", err)
return
}
for _, rpc := range t.localVnodes {
res = append(res, t.completeVnode(rpc.vn))
}
err = json.NewEncoder(newStream(ch)).Encode(&res)
if err != nil {
// log error
// tracef("error: %s", err)
return
}
// tracef("handle.ListVnodes() => %s", res)
}
// Gets a list of the vnodes on the box
func (t *transport) ListVnodes(hn string) ([]*chord.Vnode, error) {
var (
addr *e3x.Addr
ch *e3x.Channel
res []*completeVnode
err error
)
addr = t.lookupAddr(hashname.H(hn))
if addr == nil {
return nil, e3x.ErrNoAddress
}
ch, err = t.e.Open(addr, "chord.list", true)
if err != nil {
return nil, err
}
defer ch.Close()
// ch.SetReadDeadline(time.Now().Add(30*time.Second))
// ch.SetWriteDeadline(time.Now().Add(30*time.Second))
err = ch.WritePacket(&lob.Packet{})
if err != nil {
return nil, err
}
err = json.NewDecoder(newStream(ch)).Decode(&res)
if err != nil {
return nil, err
}
return t.internalVnodes(res), nil
}
// Find a successor
func (t *transport) FindSuccessors(vn *chord.Vnode, n int, k []byte) ([]*chord.Vnode, error) {
var (
addr *e3x.Addr
ch *e3x.Channel
stream io.ReadWriteCloser
res []*completeVnode
err error
req = struct {
Target string
N int
K []byte
}{vn.String(), n, k}
)
// tracef("FindSuccessors(target:Vnode(%q))", vn.String())
addr = t.lookupAddr(hashname.H(vn.Host))
if addr == nil {
return nil, e3x.ErrNoAddress
}
ch, err = t.e.Open(addr, "chord.successors.find", true)
if err != nil {
return nil, err
}
defer ch.Close()
// ch.SetReadDeadline(time.Now().Add(30*time.Second))
// ch.SetWriteDeadline(time.Now().Add(30*time.Second))
stream = newStream(ch)
err = json.NewEncoder(stream).Encode(&req)
if err != nil {
// tracef("(FindSuccessors) error: %s", err)
return nil, err
}
err = json.NewDecoder(stream).Decode(&res)
if err != nil {
// tracef("(FindSuccessors) error: %s", err)
return nil, err
}
return t.internalVnodes(res), nil
}
func (t *transport) handleNotify(ch *e3x.Channel) {
var (
err error
stream io.ReadWriteCloser
req struct {
Target string
Self *completeVnode
}
vnodes []*chord.Vnode
res []*completeVnode
)
defer ch.Close()
stream = newStream(ch)
err = json.NewDecoder(stream).Decode(&req)
if err != nil {
// log
// tracef("(Notify) error: %s", err)
return
}
rpc := t.lookupRPC(req.Target)
if rpc == nil {
// log
// tracef("(Notify) error: %s", "no RPC")
return
}
vnodes, err = rpc.Notify(t.internalVnode(req.Self))
if err != nil {
// log
// tracef("(Notify) error: %s", err)
return
}
res = t.completeVnodes(vnodes)
err = json.NewEncoder(stream).Encode(&res)
if err != nil {
// log
// tracef("(Notify) error: %s", err)
return
}
// tracef("handle.Notify(target:Vnode(%q), self:Vnode(%q)) => []Vnode(%v)", req.Target, req.Self.Id, res)
}
func (t *transport) handleGetPredecessor(ch *e3x.Channel) {
var (
err error
pkt *lob.Packet
id string
vnode *chord.Vnode
res *completeVnode
)
defer ch.Close()
pkt, err = ch.ReadPacket()
if err != nil {
// log error
// tracef("error: %s", err)
return
}
id, _ = pkt.Header().GetString("vn")
rpc := t.lookupRPC(id)
if rpc == nil {
// log
// tracef("error: %s", "no RPC")
return
}
vnode, err = rpc.GetPredecessor()
if err != nil {
// log
// tracef("error: %s", err)
return
}
res = t.completeVnode(vnode)
err = json.NewEncoder(newStream(ch)).Encode(&res)
if err != nil {
// log
// tracef("error: %s", err)
return
}
if res != nil {
// tracef("handle.GetPredecessor(Vnode(%q)) => Vnode(%q)", id, res.Id)
}
}
// Notify our successor of ourselves
func (t *transport) Notify(target, self *chord.Vnode) ([]*chord.Vnode, error) {
var (
addr *e3x.Addr
ch *e3x.Channel
stream io.ReadWriteCloser
res []*completeVnode
err error
req = struct {
Target string
Self *completeVnode
}{target.String(), t.completeVnode(self)}
)
addr = t.lookupAddr(hashname.H(target.Host))
if addr == nil {
return nil, e3x.ErrNoAddress
}
ch, err = t.e.Open(addr, "chord.notify", true)
if err != nil {
return nil, err
}
defer ch.Close()
// ch.SetReadDeadline(time.Now().Add(30*time.Second))
// ch.SetWriteDeadline(time.Now().Add(30*time.Second))
stream = newStream(ch)
err = json.NewEncoder(stream).Encode(&req)
if err != nil {
return nil, err
}
err = json.NewDecoder(stream).Decode(&res)
if err != nil {
return nil, err
}
// tracef("Notify(target:Vnode(%q), self:Vnode(%q)) => []Vnode(%v)", target.String(), self.String(), res)
return t.internalVnodes(res), nil
}
// Request a nodes predecessor
func (t *transport) GetPredecessor(vn *chord.Vnode) (*chord.Vnode, error) {
var (
addr *e3x.Addr
ch *e3x.Channel
pkt *lob.Packet
res *completeVnode
err error
)
addr = t.lookupAddr(hashname.H(vn.Host))
if addr == nil {
return nil, e3x.ErrNoAddress
}
ch, err = t.e.Open(addr, "chord.predecessor.get", true)
if err != nil {
return nil, err
}
defer ch.Close()
// ch.SetReadDeadline(time.Now().Add(30*time.Second))
// ch.SetWriteDeadline(time.Now().Add(30*time.Second))
pkt = &lob.Packet{}
pkt.Header().SetString("vn", vn.String())
err = ch.WritePacket(pkt)
if err != nil {
return nil, err
}
err = json.NewDecoder(newStream(ch)).Decode(&res)
if err != nil {
return nil, err
}
if res != nil {
// tracef("GetPredecessor(Vnode(%q)) => Vnode(%q)", vn.String(), res.Id)
}
return t.internalVnode(res), nil
}
func (t *transport) handleFindSuccessors(ch *e3x.Channel) {
var (
err error
stream io.ReadWriteCloser
req struct {
Target string
N int
K []byte
}
res []*chord.Vnode
)
defer ch.Close()
stream = newStream(ch)
err = json.NewDecoder(stream).Decode(&req)
if err != nil {
// log
// tracef("(FindSuccessors) error: %s", err)
return
}
rpc := t.lookupRPC(req.Target)
if rpc != nil {
res, err = rpc.FindSuccessors(req.N, req.K)
if err != nil {
// log
// tracef("(FindSuccessors) error: %s", err)
return
}
}
err = json.NewEncoder(stream).Encode(t.completeVnodes(res))
if err != nil {
// log
// tracef("(FindSuccessors) error: %s", err)
return
}
}
func (rt *RoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
var (
hashname = hashname.H(req.URL.Host)
c *e3x.Channel
resp *http.Response
err error
)
x := rt.Endpoint.GetExchange(hashname)
if x == nil {
return nil, e3x.UnreachableEndpointError(hashname)
}
c, err = x.Open("thtp", true)
if err != nil {
c.Close()
return nil, err
}
err = rt.writeRequest(req, c)
if err != nil {
c.Close()
return nil, err
}
resp, err = rt.readResponse(c)
if err != nil {
c.Close()
return nil, err
}
resp.Request = req
return resp, nil
}
func (mod *module) serveTelehash(c *e3x.Channel) {
defer c.Close()
defer func() {
if err := recover(); err != nil {
const size = 64 << 10
buf := make([]byte, size)
buf = buf[:runtime.Stack(buf, false)]
mod.logf("thtp: panic serving %s: %v\n%s", c.RemoteHashname(), err, buf)
}
}()
req, err := mod.readRequest(c)
if err != nil {
return
}
rw := newResponseWriter(c)
defer rw.Flush()
mod.handler.ServeHTTP(rw, req)
}
// Ping a Vnode, check for liveness
func (t *transport) Ping(vn *chord.Vnode) (bool, error) {
var (
addr *e3x.Addr
ch *e3x.Channel
pkt *lob.Packet
alive bool
err error
)
addr = t.lookupAddr(hashname.H(vn.Host))
if addr == nil {
return false, e3x.ErrNoAddress
}
ch, err = t.e.Open(addr, "chord.ping", true)
if err != nil {
return false, err
}
defer ch.Close()
// ch.SetReadDeadline(time.Now().Add(30*time.Second))
// ch.SetWriteDeadline(time.Now().Add(30*time.Second))
pkt = &lob.Packet{}
pkt.Header().SetString("vn", vn.String())
err = ch.WritePacket(pkt)
if err != nil {
return false, err
}
pkt, err = ch.ReadPacket()
if err != nil {
return false, err
}
alive, _ = pkt.Header().GetBool("alive")
// tracef("Ping(Vnode(%q)) => %v", vn.String(), alive)
return alive, nil
}
func (d *dht) handle_see(c *e3x.Channel) {
defer c.Close()
pkt, err := c.ReadPacket()
if err != nil {
return
}
key, ok := pkt.Header().GetString("key")
if !ok {
return
}
h := d.localLookup(key)
pkt = &lob.Packet{}
pkt.Header().Set("see", h)
pkt.Header().SetBool("end", true)
err = c.WritePacket(pkt)
if err != nil {
return
}
}
// Instructs a node to skip a given successor. Used to leave.
func (t *transport) SkipSuccessor(target, self *chord.Vnode) error {
var (
addr *e3x.Addr
ch *e3x.Channel
stream io.ReadWriteCloser
err error
req = struct {
Target string
Self *completeVnode
}{target.String(), t.completeVnode(self)}
)
addr = t.lookupAddr(hashname.H(target.Host))
if addr == nil {
return e3x.ErrNoAddress
}
ch, err = t.e.Open(addr, "chord.successor.skip", true)
if err != nil {
return err
}
defer ch.Close()
// ch.SetReadDeadline(time.Now().Add(30*time.Second))
// ch.SetWriteDeadline(time.Now().Add(30*time.Second))
stream = newStream(ch)
err = json.NewEncoder(stream).Encode(&req)
if err != nil {
return err
}
return nil
}
