package proxy import ( "context" "fmt" "log" "net" "net/http" "net/http/httputil" "net/url" "time" "forge.cadoles.com/Cadoles/go-proxy" bouncerChi "forge.cadoles.com/cadoles/bouncer/internal/chi" "forge.cadoles.com/cadoles/bouncer/internal/config" "forge.cadoles.com/cadoles/bouncer/internal/proxy/director" "forge.cadoles.com/cadoles/bouncer/internal/store" "github.com/go-chi/chi/v5" "github.com/go-chi/chi/v5/middleware" "github.com/pkg/errors" "github.com/prometheus/client_golang/prometheus/promhttp" "gitlab.com/wpetit/goweb/logger" ) type Server struct { serverConfig config.ProxyServerConfig redisConfig config.RedisConfig directorLayers []director.Layer proxyRepository store.ProxyRepository layerRepository store.LayerRepository } func (s *Server) Start(ctx context.Context) (<-chan net.Addr, <-chan error) { errs := make(chan error) addrs := make(chan net.Addr) go s.run(ctx, addrs, errs) return addrs, errs } func (s *Server) run(parentCtx context.Context, addrs chan net.Addr, errs chan error) { defer func() { close(errs) close(addrs) }() ctx, cancel := context.WithCancel(parentCtx) defer cancel() if err := s.initRepositories(ctx); err != nil { errs <- errors.WithStack(err) return } listener, err := net.Listen("tcp", fmt.Sprintf("%s:%d", s.serverConfig.HTTP.Host, s.serverConfig.HTTP.Port)) if err != nil { errs <- errors.WithStack(err) return } addrs <- listener.Addr() defer func() { if err := listener.Close(); err != nil && !errors.Is(err, net.ErrClosed) { errs <- errors.WithStack(err) } }() go func() { <-ctx.Done() if err := listener.Close(); err != nil && !errors.Is(err, net.ErrClosed) { log.Printf("%+v", errors.WithStack(err)) } }() router := chi.NewRouter() logger.Info(ctx, "http server listening") director := director.New( s.proxyRepository, s.layerRepository, s.directorLayers..., ) router.Use(middleware.RequestLogger(bouncerChi.NewLogFormatter())) if s.serverConfig.Metrics.Enabled { metrics := s.serverConfig.Metrics logger.Info(ctx, "enabling metrics", logger.F("endpoint", metrics.Endpoint)) router.Group(func(r chi.Router) { if metrics.BasicAuth != nil { logger.Info(ctx, "enabling authentication on metrics endpoint") r.Use(middleware.BasicAuth( "metrics", metrics.BasicAuth.CredentialsMap(), )) } r.Handle(string(metrics.Endpoint), promhttp.Handler()) }) } router.Group(func(r chi.Router) { r.Use(director.Middleware()) handler := proxy.New( proxy.WithRequestTransformers( director.RequestTransformer(), ), proxy.WithResponseTransformers( director.ResponseTransformer(), ), proxy.WithReverseProxyFactory(s.createReverseProxy), ) r.Handle("/*", handler) }) if err := http.Serve(listener, router); err != nil && !errors.Is(err, net.ErrClosed) { errs <- errors.WithStack(err) } logger.Info(ctx, "http server exiting") } func (s *Server) createReverseProxy(ctx context.Context, target *url.URL) *httputil.ReverseProxy { reverseProxy := httputil.NewSingleHostReverseProxy(target) dialConfig := s.serverConfig.Dial dialer := &net.Dialer{ Timeout: time.Duration(*dialConfig.Timeout), KeepAlive: time.Duration(*dialConfig.KeepAlive), FallbackDelay: time.Duration(*dialConfig.FallbackDelay), DualStack: bool(dialConfig.DualStack), } transportConfig := s.serverConfig.Transport reverseProxy.Transport = &http.Transport{ Proxy: http.ProxyFromEnvironment, DialContext: dialer.DialContext, ForceAttemptHTTP2: bool(transportConfig.ForceAttemptHTTP2), MaxIdleConns: int(transportConfig.MaxIdleConns), MaxIdleConnsPerHost: int(transportConfig.MaxIdleConnsPerHost), MaxConnsPerHost: int(transportConfig.MaxConnsPerHost), IdleConnTimeout: time.Duration(*transportConfig.IdleConnTimeout), TLSHandshakeTimeout: time.Duration(*transportConfig.TLSHandshakeTimeout), ExpectContinueTimeout: time.Duration(*transportConfig.ExpectContinueTimeout), DisableKeepAlives: bool(transportConfig.DisableKeepAlives), DisableCompression: bool(transportConfig.DisableCompression), ResponseHeaderTimeout: time.Duration(*transportConfig.ResponseHeaderTimeout), WriteBufferSize: int(transportConfig.WriteBufferSize), ReadBufferSize: int(transportConfig.ReadBufferSize), MaxResponseHeaderBytes: int64(transportConfig.MaxResponseHeaderBytes), } reverseProxy.ErrorHandler = s.errorHandler return reverseProxy } func (s *Server) errorHandler(w http.ResponseWriter, r *http.Request, err error) { logger.Error(r.Context(), "proxy error", logger.E(errors.WithStack(err))) http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError) } func NewServer(funcs ...OptionFunc) *Server { opt := defaultOption() for _, fn := range funcs { fn(opt) } return &Server{ serverConfig: opt.ServerConfig, redisConfig: opt.RedisConfig, directorLayers: opt.DirectorLayers, } }