// This does the actual data transfer.
// The broker only closes the Read side.
func broker(dst, src net.Conn, srcClosed chan bool, written, errors *int64) {
_, err := io.Copy(dst, src)
if err != nil {
atomic.AddInt64(errors, 1)
log.Errorf("ERROR: Copy error: %s", err)
}
if err := src.Close(); err != nil {
atomic.AddInt64(errors, 1)
log.Errorf("ERROR: Close error: %s", err)
}
srcClosed <- true
}
func loadConfig() {
for _, cfgPath := range []string{stateConfig, defaultConfig} {
if cfgPath == "" {
continue
}
cfgData, err := ioutil.ReadFile(cfgPath)
if err != nil {
log.Warnln("WARN: Reading config ", err)
continue
}
var cfg client.Config
err = json.Unmarshal(cfgData, &cfg)
if err != nil {
log.Warnln("WARN: Config error:", err)
continue
}
log.Debug("DEBUG: Loaded config from:", cfgPath)
if err := Registry.UpdateConfig(cfg); err != nil {
log.Errorf("ERROR: Unable to load config: %s", err)
}
}
}
func NewBackend(cfg client.BackendConfig) *Backend {
b := &Backend{
Name: cfg.Name,
Addr: cfg.Addr,
CheckAddr: cfg.CheckAddr,
Weight: cfg.Weight,
Network: cfg.Network,
stopCheck: make(chan interface{}),
}
// don't want a weight of 0
if b.Weight == 0 {
b.Weight = 1
}
if b.Network == "" {
b.Network = "tcp"
}
switch b.Network {
case "udp", "udp4", "udp6":
var err error
b.udpAddr, err = net.ResolveUDPAddr(b.Network, b.Addr)
if err != nil {
log.Errorf("ERROR: %s", err.Error())
b.up = false
}
}
return b
}
// Add a new service to the Registry.
// Do not replace an existing service.
func (s *ServiceRegistry) AddService(svcCfg client.ServiceConfig) error {
s.Lock()
defer s.Unlock()
log.Debug("DEBUG: Adding service:", svcCfg.Name)
if _, ok := s.svcs[svcCfg.Name]; ok {
log.Debug("DEBUG: Service already exists:", svcCfg.Name)
return ErrDuplicateService
}
s.setServiceDefaults(&svcCfg)
svcCfg = svcCfg.SetDefaults()
service := NewService(svcCfg)
err := service.start()
if err != nil {
log.Errorf("ERROR: Unable to start service '%s'", svcCfg.Name)
return err
}
s.svcs[service.Name] = service
svcCfg.VirtualHosts = filterEmpty(svcCfg.VirtualHosts)
for _, name := range svcCfg.VirtualHosts {
vhost := s.vhosts[name]
if vhost == nil {
vhost = &VirtualHost{Name: name}
s.vhosts[name] = vhost
}
vhost.Add(service)
}
return nil
}
// This probably shouldn't be called ServeHTTP anymore
func (p *ReverseProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request, addrs []string) {
pr := &ProxyRequest{
ResponseWriter: rw,
Request: req,
Backends: addrs,
}
for _, f := range p.OnRequest {
cont := f(pr)
if !cont {
return
}
}
pr.StartTime = time.Now()
res, err := p.doRequest(pr)
pr.Response = res
pr.ProxyError = err
pr.FinishTime = time.Now()
if err != nil {
log.Errorf("ERROR: HTTP proxy error - %v", err)
// We want to ensure that we have a non-nil response even on error for
// the OnResponse callbacks. If the Callback chain completes, this will
// be written to the client.
res = &http.Response{
Header: make(map[string][]string),
StatusCode: http.StatusBadGateway,
Status: http.StatusText(http.StatusBadGateway),
// this ensures Body isn't nil
Body: ioutil.NopCloser(bytes.NewReader(nil)),
}
pr.Response = res
}
for _, h := range hopHeaders {
res.Header.Del(h)
}
copyHeader(rw.Header(), res.Header)
for _, f := range p.OnResponse {
cont := f(pr)
if !cont {
return
}
}
// calls all completed with true, write the Response back to the client.
defer res.Body.Close()
rw.WriteHeader(res.StatusCode)
_, err = p.copyResponse(rw, res.Body)
if err != nil {
log.Warnf("WARN: id=%s transfer error: %s", req.Header.Get("X-Request-Id"), err)
}
}
func deleteService(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
err := Registry.RemoveService(vars["service"])
if err != nil {
log.Errorf("ERROR: %s", err)
http.Error(w, err.Error(), http.StatusNotFound)
return
}
go writeStateConfig()
w.Write(marshal(Registry.Config()))
}
func getBackendStats(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
serviceName := vars["service"]
backendName := vars["backend"]
backend, err := Registry.BackendStats(serviceName, backendName)
if err != nil {
log.Errorf("ERROR: %s", err)
http.Error(w, err.Error(), http.StatusNotFound)
return
}
w.Write(marshal(backend))
}
// Update the global config state, including services and backends.
// This does not remove any Services, but will add or update any provided in
// the config.
func (s *ServiceRegistry) UpdateConfig(cfg client.Config) error {
// Set globals
// TODO: we might need to unset something
// TODO: this should remove services and backends to match the submitted config
if cfg.Balance != "" {
s.cfg.Balance = cfg.Balance
}
if cfg.CheckInterval != 0 {
s.cfg.CheckInterval = cfg.CheckInterval
}
if cfg.Fall != 0 {
s.cfg.Fall = cfg.Fall
}
if cfg.Rise != 0 {
s.cfg.Rise = cfg.Rise
}
if cfg.ClientTimeout != 0 {
s.cfg.ClientTimeout = cfg.ClientTimeout
}
if cfg.ServerTimeout != 0 {
s.cfg.ServerTimeout = cfg.ServerTimeout
}
if cfg.DialTimeout != 0 {
s.cfg.DialTimeout = cfg.DialTimeout
}
// apply the https rediect flag
if httpsRedirect {
s.cfg.HTTPSRedirect = true
}
invalidPorts := []string{
// FIXME: lookup bound addresses some other way. We may have multiple
// http listeners, as well as all listening Services.
// listenAddr[strings.Index(listenAddr, ":")+1:],
adminListenAddr[strings.Index(adminListenAddr, ":")+1:],
}
errors := &multiError{}
for _, svc := range cfg.Services {
for _, port := range invalidPorts {
if strings.HasSuffix(svc.Addr, port) {
// TODO: report conflicts between service listeners
errors.Add(fmt.Errorf("Port conflict: %s port %s already bound by shuttle", svc.Name, port))
continue
}
}
// Add a new service, or update an existing one.
if Registry.GetService(svc.Name) == nil {
if err := Registry.AddService(svc); err != nil {
log.Errorf("ERROR: Unable to add service %s - %s", svc.Name, err.Error())
errors.Add(err)
continue
}
} else if err := Registry.UpdateService(svc); err != nil {
log.Errorf("ERROR: Unable to update service %s - %s", svc.Name, err.Error())
errors.Add(err)
continue
}
}
go writeStateConfig()
if errors.Len() == 0 {
return nil
}
return errors
}