func (s *ServiceRegistry) RemoveService(name string) error {
s.Lock()
defer s.Unlock()
svc, ok := s.svcs[name]
if ok {
log.Debugf("Removing Service %s", svc.Name)
delete(s.svcs, name)
svc.stop()
for host, vhost := range s.vhosts {
vhost.Remove(svc)
removeVhost := true
for _, service := range s.svcs {
for _, h := range service.VirtualHosts {
if host == h {
// FIXME: is this still correct? NOT TESTED!
// vhost exists in another service, so leave it
removeVhost = false
break
}
}
}
if removeVhost {
log.Debugf("Removing VirtualHost %s", host)
delete(s.vhosts, host)
}
}
return nil
}
return ErrNoService
}
func (b *Backend) Proxy(srvConn, cliConn net.Conn) {
log.Debugf("Initiating proxy: %s/%s-%s/%s",
cliConn.RemoteAddr(),
cliConn.LocalAddr(),
srvConn.LocalAddr(),
srvConn.RemoteAddr(),
)
// Backend is a pointer receiver so we can get the address of the fields,
// but all updates will be done atomically.
bConn := &shuttleConn{
TCPConn: srvConn.(*net.TCPConn),
rwTimeout: b.rwTimeout,
read: &b.Rcvd,
written: &b.Sent,
}
// TODO: No way to force shutdown. Do we need it, or should we always just
// let a connection run out?
atomic.AddInt64(&b.Conns, 1)
atomic.AddInt64(&b.Active, 1)
defer atomic.AddInt64(&b.Active, -1)
// channels to wait on close event
backendClosed := make(chan bool, 1)
clientClosed := make(chan bool, 1)
go broker(bConn, cliConn, clientClosed, &b.Sent, &b.Errors)
go broker(cliConn, bConn, backendClosed, &b.Rcvd, &b.Errors)
// wait for one half of the proxy to exit, then trigger a shutdown of the
// other half by calling CloseRead(). This will break the read loop in the
// broker and fully close the connection.
var waitFor chan bool
select {
case <-clientClosed:
log.Debugf("Client %s/%s closed connection", cliConn.RemoteAddr(), cliConn.LocalAddr())
// the client closed first, so any more packets here are invalid, and
// we can SetLinger(0) to recycle the port faster.
bConn.TCPConn.SetLinger(0)
bConn.CloseRead()
waitFor = backendClosed
case <-backendClosed:
log.Debugf("Server %s/%s closed connection", srvConn.RemoteAddr(), srvConn.LocalAddr())
cliConn.(closeReader).CloseRead()
waitFor = clientClosed
}
// wait for the other connection to close
<-waitFor
}
func (v *VirtualHost) Remove(svc *Service) {
v.Lock()
defer v.Unlock()
found := -1
for i, s := range v.services {
if s.Name == svc.Name {
found = i
break
}
}
if found < 0 {
log.Debugf("Service %s not found under VirtualHost %s", svc.Name, v.Name)
return
}
// safe way to get the backends info for logging
svcCfg := svc.Config()
// Now removing this Service
for _, backend := range svcCfg.Backends {
log.Printf("Removing backend http://%s from VirtualHost %s", backend.Addr, v.Name)
}
v.services = append(v.services[:found], v.services[found+1:]...)
}
// find certs in and is the named directory, and match them up by their base
// name using '.pem' and '.key' as extensions.
func loadCerts(certDir string) (*tls.Config, error) {
abs, err := filepath.Abs(certDir)
if err != nil {
return nil, err
}
dir, err := ioutil.ReadDir(abs)
if err != nil {
return nil, err
}
// [cert, key] pairs
pairs := make(map[string][2]string)
for _, f := range dir {
name := f.Name()
if strings.HasSuffix(name, ".pem") {
p := pairs[name[:len(name)-4]]
p[0] = filepath.Join(abs, name)
pairs[name[:len(name)-4]] = p
}
if strings.HasSuffix(name, ".key") {
p := pairs[name[:len(name)-4]]
p[1] = filepath.Join(abs, name)
pairs[name[:len(name)-4]] = p
}
}
tlsCfg := &tls.Config{
NextProtos: []string{"http/1.1"},
}
for key, pair := range pairs {
if pair[0] == "" {
log.Errorf("missing cert for key: %s", pair[1])
continue
}
if pair[1] == "" {
log.Errorf("missing key for cert: %s", pair[0])
continue
}
cert, err := tls.LoadX509KeyPair(pair[0], pair[1])
if err != nil {
log.Error(err)
continue
}
tlsCfg.Certificates = append(tlsCfg.Certificates, cert)
log.Debugf("loaded X509KeyPair for %s", key)
}
if len(tlsCfg.Certificates) == 0 {
return nil, fmt.Errorf("no tls certificates loaded")
}
tlsCfg.BuildNameToCertificate()
return tlsCfg, nil
}
func (b *Backend) check() {
if b.CheckAddr == "" {
return
}
up := true
if c, e := net.DialTimeout("tcp", b.CheckAddr, b.dialTimeout); e == nil {
c.(*net.TCPConn).SetLinger(0)
c.Close()
} else {
log.Debug("Check error:", e)
up = false
}
b.Lock()
defer b.Unlock()
if up {
log.Debugf("Check OK for %s/%s", b.Name, b.CheckAddr)
b.fallCount = 0
b.riseCount++
b.checkOK++
if b.riseCount >= b.rise {
if !b.up {
log.Debugf("Marking backend %s Up", b.Name)
}
b.up = true
}
} else {
log.Debugf("Check failed for %s/%s", b.Name, b.CheckAddr)
b.riseCount = 0
b.fallCount++
b.checkFail++
if b.fallCount >= b.fall {
if b.up {
log.Debugf("Marking backend %s Down", b.Name)
}
b.up = false
}
}
}
// Add or update a Backend on an existing Service.
func (s *ServiceRegistry) AddBackend(svcName string, backendCfg client.BackendConfig) error {
s.Lock()
defer s.Unlock()
service, ok := s.svcs[svcName]
if !ok {
return ErrNoService
}
log.Debugf("Adding Backend %s/%s", service.Name, backendCfg.Name)
service.add(NewBackend(backendCfg))
return nil
}
// Remove a Backend from an existing Service.
func (s *ServiceRegistry) RemoveBackend(svcName, backendName string) error {
s.Lock()
defer s.Unlock()
log.Debugf("Removing Backend %s/%s", svcName, backendName)
service, ok := s.svcs[svcName]
if !ok {
return ErrNoService
}
if !service.remove(backendName) {
return ErrNoBackend
}
return nil
}
// Insert a service
// do nothing if the service already is registered
func (v *VirtualHost) Add(svc *Service) {
v.Lock()
defer v.Unlock()
for _, s := range v.services {
if s.Name == svc.Name {
log.Debugf("Service %s already registered in VirtualHost %s", svc.Name, v.Name)
return
}
}
// TODO: is this the best place to log these?
svcCfg := svc.Config()
for _, backend := range svcCfg.Backends {
log.Printf("Adding backend http://%s to VirtualHost %s", backend.Addr, v.Name)
}
v.services = append(v.services, svc)
}
func (e *ErrorResponse) fetch(page *ErrorPage) {
log.Debugf("Fetching error page from %s", page.Location)
resp, err := e.client.Get(page.Location)
if err != nil {
log.Warnf("Could not fetch %s: %s", page.Location, err.Error())
return
}
defer resp.Body.Close()
// If the StatusCode matches any of our registered codes, it's OK
for _, code := range page.StatusCodes {
if resp.StatusCode == code {
resp.StatusCode = http.StatusOK
break
}
}
if resp.StatusCode != http.StatusOK {
log.Warnf("Server returned %d when fetching %s", resp.StatusCode, page.Location)
return
}
header := make(map[string][]string)
for _, key := range ErrorHeaders {
if hdr, ok := resp.Header[key]; ok {
header[key] = hdr
}
}
// set the headers along with the body below
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Warnf("Error reading response from %s: %s", page.Location, err.Error())
return
}
if len(body) > 0 {
page.SetHeader(header)
page.SetBody(body)
return
}
log.Warnf("Empty response from %s", page.Location)
}
// Replace the service's configuration, or update its list of backends.
// Replacing a configuration will shutdown the existing service, and start a
// new one, which will cause the listening socket to be temporarily
// unavailable.
func (s *ServiceRegistry) UpdateService(newCfg client.ServiceConfig) error {
s.Lock()
defer s.Unlock()
log.Debug("Updating Service:", newCfg.Name)
service, ok := s.svcs[newCfg.Name]
if !ok {
log.Debug("Service not found:", newCfg.Name)
return ErrNoService
}
currentCfg := service.Config()
newCfg.Merge(currentCfg)
if err := service.UpdateConfig(newCfg); err != nil {
return err
}
// Lots of looping here (including fetching the Config, but the cardinality
// of Backends shouldn't be very large, and the default RoundRobin balancing
// is much simpler with a slice.
// we're going to update just the backends for this config
// get a map of what's already running
currentBackends := make(map[string]client.BackendConfig)
for _, backendCfg := range currentCfg.Backends {
currentBackends[backendCfg.Name] = backendCfg
}
// Keep existing backends when they have equivalent config.
// Update changed backends, and add new ones.
for _, newBackend := range newCfg.Backends {
current, ok := currentBackends[newBackend.Name]
if ok && current.Equal(newBackend) {
log.Debugf("Backend %s/%s unchanged", service.Name, current.Name)
// no change for this one
delete(currentBackends, current.Name)
continue
}
// we need to remove and re-add this backend
log.Debugf("Updating Backend %s/%s", service.Name, newBackend.Name)
service.remove(newBackend.Name)
service.add(NewBackend(newBackend))
delete(currentBackends, newBackend.Name)
}
// remove any left over backends
for name := range currentBackends {
log.Debugf("Removing Backend %s/%s", service.Name, name)
service.remove(name)
}
if currentCfg.Equal(newCfg) {
log.Debugf("Service Unchanged %s", service.Name)
return nil
}
// replace error pages if there's any change
if !reflect.DeepEqual(service.errPagesCfg, newCfg.ErrorPages) {
log.Debugf("Updating ErrorPages")
service.errPagesCfg = newCfg.ErrorPages
service.errorPages.Update(newCfg.ErrorPages)
}
s.updateVHosts(service, filterEmpty(newCfg.VirtualHosts))
return nil
}
