func NewProxy(hosts map[string]string) (*Proxy, error) {
clog := log.WithFields(log.Fields{})
fwd, err := forward.New(forward.Logger(clog))
if err != nil {
return nil, err
}
return &Proxy{
hosts: hosts,
fwd: fwd,
log: clog,
}, nil
}
func new(c *C, p string) (*roundrobin.RoundRobin, *Streamer) {
logger := utils.NewFileLogger(os.Stdout, utils.INFO)
// forwarder will proxy the request to whatever destination
fwd, err := forward.New(forward.Logger(logger))
c.Assert(err, IsNil)
// load balancer will round robin request
lb, err := roundrobin.New(fwd)
c.Assert(err, IsNil)
// stream handler will forward requests to redirect, make sure it uses files
st, err := New(lb, Logger(logger), Retry(p), MemRequestBodyBytes(1))
c.Assert(err, IsNil)
return lb, st
}
func main() {
logger := utils.NewFileLogger(os.Stdout, utils.INFO)
// Forwards incoming requests to whatever location URL points to, adds proper forwarding headers
fwd, _ := forward.New(forward.Logger(logger))
redirect := http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
// let us forward this request to another server
req.URL = testutils.ParseURI("http://localhost")
fwd.ServeHTTP(w, req)
})
// that's it! our reverse proxy is ready!
s := &http.Server{
Addr: ":8088",
Handler: redirect,
}
s.ListenAndServe()
}
func LoadConfig(configuration *Configuration, gloablConfiguration *GlobalConfiguration) (*mux.Router, error) {
router := mux.NewRouter()
router.NotFoundHandler = http.HandlerFunc(notFoundHandler)
backends := map[string]http.Handler{}
for frontendName, frontend := range configuration.Frontends {
log.Debug("Creating frontend %s", frontendName)
fwd, _ := forward.New(forward.Logger(oxyLogger))
newRoute := router.NewRoute().Name(frontendName)
for routeName, route := range frontend.Routes {
log.Debug("Creating route %s %s:%s", routeName, route.Rule, route.Value)
newRouteReflect := Invoke(newRoute, route.Rule, route.Value)
newRoute = newRouteReflect[0].Interface().(*mux.Route)
}
if backends[frontend.Backend] == nil {
log.Debug("Creating backend %s", frontend.Backend)
lb, _ := roundrobin.New(fwd)
rb, _ := roundrobin.NewRebalancer(lb, roundrobin.RebalancerLogger(oxyLogger))
for serverName, server := range configuration.Backends[frontend.Backend].Servers {
if url, err := url.Parse(server.Url); err != nil {
return nil, err
} else {
log.Debug("Creating server %s %s", serverName, url.String())
rb.UpsertServer(url, roundrobin.Weight(server.Weight))
}
}
backends[frontend.Backend] = rb
} else {
log.Debug("Reusing backend %s", frontend.Backend)
}
// stream.New(backends[frontend.Backend], stream.Retry("IsNetworkError() && Attempts() <= " + strconv.Itoa(gloablConfiguration.Replay)), stream.Logger(oxyLogger))
var negroni = negroni.New()
negroni.Use(middlewares.NewCircuitBreaker(backends[frontend.Backend], cbreaker.Logger(oxyLogger)))
newRoute.Handler(negroni)
err := newRoute.GetError()
if err != nil {
log.Error("Error building route ", err)
}
}
return router, nil
}
// LoadConfig returns a new gorrilla.mux Route from the specified global configuration and the dynamic
// provider configurations.
func LoadConfig(configurations configs, globalConfiguration *GlobalConfiguration) (*mux.Router, error) {
router := mux.NewRouter()
router.NotFoundHandler = http.HandlerFunc(notFoundHandler)
backends := map[string]http.Handler{}
for _, configuration := range configurations {
for frontendName, frontend := range configuration.Frontends {
log.Debugf("Creating frontend %s", frontendName)
fwd, _ := forward.New(forward.Logger(oxyLogger), forward.PassHostHeader(frontend.PassHostHeader))
newRoute := router.NewRoute().Name(frontendName)
for routeName, route := range frontend.Routes {
log.Debugf("Creating route %s %s:%s", routeName, route.Rule, route.Value)
newRouteReflect, err := invoke(newRoute, route.Rule, route.Value)
if err != nil {
return nil, err
}
newRoute = newRouteReflect[0].Interface().(*mux.Route)
}
if backends[frontend.Backend] == nil {
log.Debugf("Creating backend %s", frontend.Backend)
var lb http.Handler
rr, _ := roundrobin.New(fwd)
if configuration.Backends[frontend.Backend] == nil {
return nil, errors.New("Backend not found: " + frontend.Backend)
}
lbMethod, err := types.NewLoadBalancerMethod(configuration.Backends[frontend.Backend].LoadBalancer)
if err != nil {
configuration.Backends[frontend.Backend].LoadBalancer = &types.LoadBalancer{Method: "wrr"}
}
switch lbMethod {
case types.Drr:
log.Infof("Creating load-balancer drr")
rebalancer, _ := roundrobin.NewRebalancer(rr, roundrobin.RebalancerLogger(oxyLogger))
lb = rebalancer
for serverName, server := range configuration.Backends[frontend.Backend].Servers {
url, err := url.Parse(server.URL)
if err != nil {
return nil, err
}
log.Infof("Creating server %s %s", serverName, url.String())
rebalancer.UpsertServer(url, roundrobin.Weight(server.Weight))
}
case types.Wrr:
log.Infof("Creating load-balancer wrr")
lb = middlewares.NewWebsocketUpgrader(rr)
for serverName, server := range configuration.Backends[frontend.Backend].Servers {
url, err := url.Parse(server.URL)
if err != nil {
return nil, err
}
log.Infof("Creating server %s %s", serverName, url.String())
rr.UpsertServer(url, roundrobin.Weight(server.Weight))
}
}
var negroni = negroni.New()
if configuration.Backends[frontend.Backend].CircuitBreaker != nil {
log.Infof("Creating circuit breaker %s", configuration.Backends[frontend.Backend].CircuitBreaker.Expression)
negroni.Use(middlewares.NewCircuitBreaker(lb, configuration.Backends[frontend.Backend].CircuitBreaker.Expression, cbreaker.Logger(oxyLogger)))
} else {
negroni.UseHandler(lb)
}
backends[frontend.Backend] = negroni
} else {
log.Infof("Reusing backend %s", frontend.Backend)
}
// stream.New(backends[frontend.Backend], stream.Retry("IsNetworkError() && Attempts() <= " + strconv.Itoa(globalConfiguration.Replay)), stream.Logger(oxyLogger))
newRoute.Handler(backends[frontend.Backend])
err := newRoute.GetError()
if err != nil {
log.Errorf("Error building route: %s", err)
}
}
}
return router, nil
}
// LoadConfig returns a new gorilla.mux Route from the specified global configuration and the dynamic
// provider configurations.
func (server *Server) loadConfig(configurations configs, globalConfiguration GlobalConfiguration) (map[string]serverEntryPoint, error) {
serverEntryPoints := server.buildEntryPoints(globalConfiguration)
redirectHandlers := make(map[string]http.Handler)
backends := map[string]http.Handler{}
for _, configuration := range configurations {
frontendNames := sortedFrontendNamesForConfig(configuration)
for _, frontendName := range frontendNames {
frontend := configuration.Frontends[frontendName]
log.Debugf("Creating frontend %s", frontendName)
fwd, _ := forward.New(forward.Logger(oxyLogger), forward.PassHostHeader(frontend.PassHostHeader))
// default endpoints if not defined in frontends
if len(frontend.EntryPoints) == 0 {
frontend.EntryPoints = globalConfiguration.DefaultEntryPoints
}
for _, entryPointName := range frontend.EntryPoints {
log.Debugf("Wiring frontend %s to entryPoint %s", frontendName, entryPointName)
if _, ok := serverEntryPoints[entryPointName]; !ok {
return nil, errors.New("Undefined entrypoint: " + entryPointName)
}
newRoute := serverEntryPoints[entryPointName].httpRouter.NewRoute().Name(frontendName)
for routeName, route := range frontend.Routes {
log.Debugf("Creating route %s %s:%s", routeName, route.Rule, route.Value)
route, err := getRoute(newRoute, route.Rule, route.Value)
if err != nil {
return nil, err
}
newRoute = route
}
entryPoint := globalConfiguration.EntryPoints[entryPointName]
if entryPoint.Redirect != nil {
if redirectHandlers[entryPointName] != nil {
newRoute.Handler(redirectHandlers[entryPointName])
} else if handler, err := server.loadEntryPointConfig(entryPointName, entryPoint); err != nil {
return nil, err
} else {
newRoute.Handler(handler)
redirectHandlers[entryPointName] = handler
}
} else {
if backends[frontend.Backend] == nil {
log.Debugf("Creating backend %s", frontend.Backend)
var lb http.Handler
rr, _ := roundrobin.New(fwd)
if configuration.Backends[frontend.Backend] == nil {
return nil, errors.New("Undefined backend: " + frontend.Backend)
}
lbMethod, err := types.NewLoadBalancerMethod(configuration.Backends[frontend.Backend].LoadBalancer)
if err != nil {
configuration.Backends[frontend.Backend].LoadBalancer = &types.LoadBalancer{Method: "wrr"}
}
switch lbMethod {
case types.Drr:
log.Debugf("Creating load-balancer drr")
rebalancer, _ := roundrobin.NewRebalancer(rr, roundrobin.RebalancerLogger(oxyLogger))
lb = rebalancer
for serverName, server := range configuration.Backends[frontend.Backend].Servers {
url, err := url.Parse(server.URL)
if err != nil {
return nil, err
}
log.Debugf("Creating server %s at %s with weight %d", serverName, url.String(), server.Weight)
rebalancer.UpsertServer(url, roundrobin.Weight(server.Weight))
}
case types.Wrr:
log.Debugf("Creating load-balancer wrr")
lb = middlewares.NewWebsocketUpgrader(rr)
for serverName, server := range configuration.Backends[frontend.Backend].Servers {
url, err := url.Parse(server.URL)
if err != nil {
return nil, err
}
log.Debugf("Creating server %s at %s with weight %d", serverName, url.String(), server.Weight)
rr.UpsertServer(url, roundrobin.Weight(server.Weight))
}
}
var negroni = negroni.New()
if configuration.Backends[frontend.Backend].CircuitBreaker != nil {
log.Debugf("Creating circuit breaker %s", configuration.Backends[frontend.Backend].CircuitBreaker.Expression)
negroni.Use(middlewares.NewCircuitBreaker(lb, configuration.Backends[frontend.Backend].CircuitBreaker.Expression, cbreaker.Logger(oxyLogger)))
} else {
negroni.UseHandler(lb)
}
backends[frontend.Backend] = negroni
} else {
log.Debugf("Reusing backend %s", frontend.Backend)
}
server.wireFrontendBackend(frontend.Routes, newRoute, backends[frontend.Backend])
}
err := newRoute.GetError()
if err != nil {
log.Errorf("Error building route: %s", err)
}
}
}
}
return serverEntryPoints, nil
}