/
server.go
137 lines (113 loc) · 3.02 KB
/
server.go
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// Copyright 2016 IBM Corporation
//
// 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 discovery
import (
"errors"
"net"
"net/http"
"sync"
log "github.com/Sirupsen/logrus"
"github.com/amalgam8/amalgam8/registry/utils/logging"
"github.com/ant0ine/go-json-rest/rest"
)
const (
module = "SIDECARREGISTER"
)
// Server defines an interface for controlling server lifecycle
type Server interface {
Start() error
Stop()
}
type server struct {
config *Config
listener net.Listener
logger *log.Entry
mutex sync.Mutex
}
// NewDiscoveryServer creates a new server based on the provided configuration options.
// Returns a valid Server interface on success or an error on failure
func NewDiscoveryServer(conf *Config) (Server, error) {
if conf == nil {
return nil, errors.New("null Discovery configuration provided")
}
s := &server{
config: conf,
logger: logging.GetLogger(module),
}
s.logger.Infof("Creating Discovery REST API on %s", s.config.HTTPAddressSpec)
return s, nil
}
func (s *server) Start() error {
handler, err := s.setup()
if err != nil {
return err
}
go func() {
err = s.serve(handler)
if err != nil {
s.logger.WithFields(log.Fields{
"error": err,
}).Warn("Failed to start the server")
}
}()
return nil
}
func (s *server) Stop() {
s.logger.Info("Stopping rest server")
s.mutex.Lock()
defer s.mutex.Unlock()
if s.listener != nil {
if err := s.listener.Close(); err != nil {
s.logger.WithFields(log.Fields{
"error": err,
}).Warn("Failed to close listener")
}
}
}
func (s *server) setup() (http.Handler, error) {
restAPI := rest.NewApi()
restAPI.Use(
&rest.RecoverMiddleware{},
&rest.TimerMiddleware{},
&rest.RecorderMiddleware{},
&rest.ContentTypeCheckerMiddleware{},
)
discoveryAPI := NewDiscovery(s.config.Discovery, s.config.Rules, s.config.TLSConfig)
router, err := rest.MakeRouter(discoveryAPI.Routes()...)
if err != nil {
return nil, err
}
restAPI.SetApp(router)
return restAPI.MakeHandler(), nil
}
func (s *server) serve(h http.Handler) error {
s.logger.Infof("Starting service discovery REST API on %s", s.config.HTTPAddressSpec)
listener, err := net.Listen("tcp", s.config.HTTPAddressSpec)
if err != nil {
s.logger.WithFields(log.Fields{
"error": err,
}).Error("Failed to start the server")
return err
}
s.mutex.Lock()
s.listener = listener
s.mutex.Unlock()
if err := http.Serve(listener, h); err != nil {
s.logger.WithFields(log.Fields{
"error": err,
}).Warn("Server has aborted")
return err
}
return nil
}