/
publicweb.go
162 lines (146 loc) · 4.19 KB
/
publicweb.go
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package guardiand
import (
"context"
"fmt"
"github.com/certusone/wormhole/bridge/pkg/proto/publicrpc/v1"
"github.com/certusone/wormhole/bridge/pkg/supervisor"
"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
"github.com/improbable-eng/grpc-web/go/grpcweb"
"go.uber.org/zap"
"golang.org/x/crypto/acme"
"golang.org/x/crypto/acme/autocert"
"google.golang.org/grpc"
"net"
"net/http"
"strings"
)
func allowCORSWrapper(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if origin := r.Header.Get("Origin"); origin != "" {
w.Header().Set("Access-Control-Allow-Origin", origin)
if r.Method == "OPTIONS" && r.Header.Get("Access-Control-Request-Method") != "" {
corsPreflightHandler(w, r)
return
}
}
h.ServeHTTP(w, r)
})
}
func corsPreflightHandler(w http.ResponseWriter, r *http.Request) {
headers := []string{
"content-type",
"accept",
"x-user-agent",
"x-grpc-web",
"grpc-status",
"grpc-message",
"authorization",
}
w.Header().Set("Access-Control-Allow-Headers", strings.Join(headers, ","))
methods := []string{"GET", "HEAD", "POST", "PUT", "DELETE"}
w.Header().Set("Access-Control-Allow-Methods", strings.Join(methods, ","))
}
func publicwebServiceRunnable(
logger *zap.Logger,
listenAddr string,
upstreamAddr string,
grpcServer *grpc.Server,
tlsHostname string,
tlsProd bool,
tlsCacheDir string,
) (supervisor.Runnable, error) {
return func(ctx context.Context) error {
conn, err := grpc.DialContext(
ctx,
fmt.Sprintf("unix:///%s", upstreamAddr),
grpc.WithBlock(),
grpc.WithInsecure())
if err != nil {
return fmt.Errorf("failed to dial upstream: %s", err)
}
gwmux := runtime.NewServeMux()
err = publicrpcv1.RegisterPublicRPCServiceHandler(ctx, gwmux, conn)
if err != nil {
panic(err)
}
mux := http.NewServeMux()
grpcWebServer := grpcweb.WrapServer(grpcServer)
mux.Handle("/", allowCORSWrapper(http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
if grpcWebServer.IsGrpcWebRequest(req) {
grpcWebServer.ServeHTTP(resp, req)
} else {
gwmux.ServeHTTP(resp, req)
}
})))
srv := &http.Server{
Handler: mux,
}
// TLS setup
if tlsHostname != "" {
logger.Info("provisioning Let's Encrypt certificate", zap.String("hostname", tlsHostname))
var acmeApi string
if tlsProd {
logger.Info("using production Let's Encrypt server")
acmeApi = autocert.DefaultACMEDirectory
} else {
logger.Info("using staging Let's Encrypt server")
acmeApi = "https://acme-staging-v02.api.letsencrypt.org/directory"
}
certManager := autocert.Manager{
Prompt: autocert.AcceptTOS,
HostPolicy: autocert.HostWhitelist(tlsHostname),
Cache: autocert.DirCache(tlsCacheDir),
Client: &acme.Client{DirectoryURL: acmeApi},
}
srv.TLSConfig = certManager.TLSConfig()
logger.Info("certificate provisioning configured")
}
var listener net.Listener
// If listenAddr is prefixed by "sd:", look for a matching systemd socket.
if strings.HasPrefix(listenAddr, "sd:") {
listeners, err := getSDListeners()
if err != nil {
return fmt.Errorf("failed to get systemd listeners: %w", err)
}
addr := listenAddr[3:]
for _, v := range listeners {
logger.Debug("found systemd socket", zap.String("addr", v.Addr().String()))
if v.Addr().String() == addr {
listener = v
}
}
if listener == nil {
all := make([]string, len(listeners))
for i := range listeners {
all[i] = listeners[i].Addr().String()
}
return fmt.Errorf("no valid systemd listeners, got: %s", strings.Join(all, ","))
}
} else {
listener, err = net.Listen("tcp", listenAddr)
if err != nil {
return fmt.Errorf("failed to listen: %v", err)
}
}
supervisor.Signal(ctx, supervisor.SignalHealthy)
errC := make(chan error)
go func() {
logger.Info("publicweb server listening", zap.String("addr", srv.Addr))
if tlsHostname != "" {
errC <- srv.ServeTLS(listener, "", "")
} else {
errC <- srv.Serve(listener)
}
}()
select {
case <-ctx.Done():
// non-graceful shutdown
if err := srv.Close(); err != nil {
return err
}
return ctx.Err()
case err := <-errC:
return err
}
}, nil
}