/
service.go
74 lines (63 loc) · 1.79 KB
/
service.go
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package services
import (
// stdlib
"context"
"crypto/tls"
"fmt"
"net/http"
"strings"
// third party
"google.golang.org/grpc"
// first party
"github.com/datawire/dlib/dgroup"
"github.com/datawire/dlib/dhttp"
"github.com/datawire/dlib/dlog"
)
// Service defines a KAT backend service interface.
type Service interface {
Start(context.Context) <-chan bool
}
type HTTPListener struct {
CleartextPort int16
TLSPort int16
TLSCert string
TLSKey string
}
func (hl HTTPListener) Run(ctx context.Context, name string, httpHandler *http.ServeMux, grpcHandler *grpc.Server) <-chan bool {
dlog.Printf(ctx, "GRPCRLS: %s listening on cleartext :%d and tls :%d", name, hl.CleartextPort, hl.TLSPort)
cer, err := tls.LoadX509KeyPair(hl.TLSCert, hl.TLSKey)
if err != nil {
dlog.Error(ctx, err)
panic(err) // TODO: do something better
}
sc := &dhttp.ServerConfig{
Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
dlog.Infof(r.Context(), "handling request to %q...", r.RequestURI)
if r.ProtoMajor == 2 && strings.HasPrefix(r.Header.Get("Content-Type"), "application/grpc") {
grpcHandler.ServeHTTP(w, r)
} else {
httpHandler.ServeHTTP(w, r)
}
}),
TLSConfig: &tls.Config{
Certificates: []tls.Certificate{cer},
},
}
grp := dgroup.NewGroup(ctx, dgroup.GroupConfig{})
grp.Go("cleartext", func(ctx context.Context) error {
return sc.ListenAndServe(ctx, fmt.Sprintf(":%v", hl.CleartextPort))
})
grp.Go("tls", func(ctx context.Context) error {
return sc.ListenAndServeTLS(ctx, fmt.Sprintf(":%v", hl.TLSPort), "", "")
})
dlog.Printf(ctx, "starting %s", name)
exited := make(chan bool)
go func() {
if err := grp.Wait(); err != nil {
dlog.Error(ctx, err)
panic(err) // TODO: do something better
}
close(exited)
}()
return exited
}