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gateway.go
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gateway.go
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package gateway
import (
"fmt"
"net/http"
"sync"
"time"
"github.com/braintree/manners"
"code.cloudfoundry.org/lager"
)
type Gateway struct {
sync.RWMutex
server *manners.GracefulServer
rpCreator ReverseProxyCreator
Services map[string]ReverseProxy
}
func New(port string, rpCreator ReverseProxyCreator) *Gateway {
gw := &Gateway{
rpCreator: rpCreator,
Services: make(map[string]ReverseProxy, 0),
}
gw.server = manners.NewWithServer(&http.Server{
Addr: port,
Handler: gw,
ReadTimeout: 10 * time.Second,
WriteTimeout: 10 * time.Second,
MaxHeaderBytes: 1 << 20, // 1MB
})
return gw
}
func (gw *Gateway) Start(logger lager.Logger) error {
log := logger.Session("start")
log.Info("starting", lager.Data{"addr": gw.server.Addr})
if err := gw.server.ListenAndServe(); err != nil {
log.Fatal("failed-to-start", err)
}
return nil
}
func (gw *Gateway) Stop() bool {
return gw.server.Close()
}
func (gw *Gateway) AddService(logger lager.Logger, spec ReverseProxySpec) error {
log := logger.Session("add-service")
log.Debug("start", lager.Data{"spec": spec})
defer log.Debug("end")
reverseProxy, err := gw.rpCreator.Create(log, spec)
if err != nil {
log.Error("failed-to-create-reverse-proxy", err)
return err
}
gw.Lock()
gw.Services[spec.Host] = reverseProxy
gw.Unlock()
log.Info("service-added", lager.Data{"spec": spec})
return nil
}
func (gw *Gateway) RemoveService(logger lager.Logger, host string) error {
log := logger.Session("remove-service")
log.Debug("start", lager.Data{"host": host})
defer log.Debug("end")
if _, ok := gw.Services[host]; !ok {
return fmt.Errorf("service not found: '%s'", host)
}
gw.Lock()
delete(gw.Services, host)
gw.Unlock()
log.Info("service-removed")
return nil
}
func (gw *Gateway) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
gw.RLock()
if reverseProxy, ok := gw.Services[req.Host]; ok {
gw.RUnlock()
reverseProxy.ServeHTTP(rw, req)
return
} else {
gw.RUnlock()
}
pageNotFound(rw)
}
func pageNotFound(rw http.ResponseWriter) {
rw.WriteHeader(http.StatusNotFound)
rw.Header().Set("Content-Type", "application/json")
fmt.Fprintln(rw, `{"error":"not_found","error_description":"The requested resource could not be found but may be available again in the future."}`)
}