schnutibox/pkg/web/web.go

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package web
import (
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"context"
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"fmt"
"html/template"
"net/http"
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"strings"
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"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
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"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/rs/zerolog/log"
"github.com/spf13/cobra"
"go.xsfx.dev/logginghandler"
assets "go.xsfx.dev/schnutibox/assets/web"
"go.xsfx.dev/schnutibox/internal/config"
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api "go.xsfx.dev/schnutibox/pkg/api/v1"
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"go.xsfx.dev/schnutibox/pkg/sselog"
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"golang.org/x/net/http2"
"golang.org/x/net/http2/h2c"
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"google.golang.org/grpc"
"google.golang.org/grpc/reflection"
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)
func root(w http.ResponseWriter, r *http.Request) {
logger := logginghandler.Logger(r)
t, err := template.ParseFS(assets.Templates, "templates/index.html.tmpl")
if err != nil {
logger.Error().Err(err).Msg("could not parse template")
http.Error(w, "could not parse template", http.StatusInternalServerError)
return
}
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if err := t.Execute(w, struct{}{}); err != nil {
logger.Error().Err(err).Msg("could not execute template")
http.Error(w, "could not execute template", http.StatusInternalServerError)
return
}
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}
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// grpcHandlerFunc reads header and returns a grpc handler or a http one.
// nolint:interfacer
func grpcHandlerFunc(grpcServer *grpc.Server, otherHandler http.Handler) http.Handler {
return h2c.NewHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.ProtoMajor == 2 && strings.Contains(r.Header.Get("Content-Type"), "application/grpc") {
grpcServer.ServeHTTP(w, r)
} else {
otherHandler.ServeHTTP(w, r)
}
}), &http2.Server{})
}
type server struct{}
// Identify searches in tracks config for entries and returns them.
// nolint:goerr113
func (s server) Identify(ctx context.Context, in *api.IdentifyRequest) (*api.IdentifyResponse, error) {
r := &api.IdentifyResponse{}
if in.Id == "" {
return r, fmt.Errorf("no id in request specified")
}
t, ok := config.Cfg.Tracks[in.Id]
if !ok {
return r, fmt.Errorf("could not find track for id: %s", in.Id)
}
r.Name = t.Name
r.Uris = t.Uris
return r, nil
}
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func gw(s *grpc.Server, conn string) *runtime.ServeMux {
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ctx := context.Background()
gopts := []grpc.DialOption{grpc.WithInsecure()}
api.RegisterIdentifierServiceServer(s, server{})
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reflection.Register(s)
gwmux := runtime.NewServeMux()
if err := api.RegisterIdentifierServiceHandlerFromEndpoint(ctx, gwmux, conn, gopts); err != nil {
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log.Fatal().Err(err).Msg("could not register grpc endpoint")
}
return gwmux
}
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func Run(command *cobra.Command, args []string) {
// Create host string for serving web.
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lh := fmt.Sprintf("%s:%d", config.Cfg.Box.Hostname, config.Cfg.Box.Port)
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// Create grpc server.
grpcServer := grpc.NewServer()
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// Define http handlers.
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mux := http.NewServeMux()
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mux.Handle("/", http.HandlerFunc(root))
mux.Handle("/log", http.HandlerFunc(sselog.LogHandler))
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mux.Handle(
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"/static/",
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http.StripPrefix("/static/", http.FileServer(assets.Files)),
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)
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mux.Handle(
"/swagger-ui/",
http.StripPrefix("/swagger-ui/", http.FileServer(assets.SwaggerUI)),
)
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mux.Handle("/metrics", promhttp.Handler())
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mux.Handle("/api/", http.StripPrefix("/api", gw(grpcServer, lh)))
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// Serving http.
log.Info().Msgf("serving HTTP on %s...", lh)
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log.Fatal().Err(
http.ListenAndServe(
lh,
grpcHandlerFunc(
grpcServer,
logginghandler.Handler(mux),
),
),
).Msg("goodbye")
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}