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server.go
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server.go
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// Copyright 2014 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package api
import (
"errors"
"net"
"net/http"
"github.com/coreos/fleet/log"
)
var unavailable = &unavailableHdlr{}
func NewServer(listeners []net.Listener, hdlr http.Handler) *Server {
return &Server{
listeners: listeners,
api: hdlr,
cur: unavailable,
}
}
type Server struct {
listeners []net.Listener
api http.Handler
cur http.Handler
}
func (s *Server) GetListeners() []net.Listener {
return s.listeners
}
func (s *Server) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
s.cur.ServeHTTP(rw, req)
}
func (s *Server) Serve() {
for i, _ := range s.listeners {
l := s.listeners[i]
go func() {
err := http.Serve(l, s)
if err != nil {
log.Errorf("Failed serving HTTP on listener: addr: %v, err: %v", l.Addr(), err)
}
}()
}
}
// Available switches the Server's HTTP handler from a generic 503 Unavailable
// response to the actual API. Once the provided channel is closed, the API is
// torn back down and 503 responses are served.
func (s *Server) Available(stop <-chan struct{}) {
s.cur = s.api
<-stop
s.cur = unavailable
}
type unavailableHdlr struct{}
func (uh *unavailableHdlr) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
sendError(rw, http.StatusServiceUnavailable, errors.New("fleet server unable to communicate with etcd"))
}