mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
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0961fef727
* impl of accounts RPCs * create and list accounts impls * impl create account and list accounts * tests pass * imports * fix test
120 lines
2.9 KiB
Go
120 lines
2.9 KiB
Go
package gateway
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import (
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"context"
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"net/http"
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gwruntime "github.com/grpc-ecosystem/grpc-gateway/runtime"
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pb "github.com/prysmaticlabs/prysm/proto/validator/accounts/v2_gateway"
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"github.com/rs/cors"
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"github.com/sirupsen/logrus"
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"google.golang.org/grpc"
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)
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var log = logrus.WithField("prefix", "gateway")
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// Gateway is the gRPC gateway to serve HTTP JSON traffic as a
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// proxy and forward it to the gRPC server.
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type Gateway struct {
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conn *grpc.ClientConn
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ctx context.Context
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cancel context.CancelFunc
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gatewayAddr string
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remoteAddr string
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server *http.Server
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mux *http.ServeMux
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allowedOrigins []string
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startFailure error
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}
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// New returns a new gateway server which translates HTTP into gRPC.
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// Accepts a context and optional http.ServeMux.
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func New(
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ctx context.Context,
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remoteAddress,
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gatewayAddress string,
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allowedOrigins []string,
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) *Gateway {
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return &Gateway{
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remoteAddr: remoteAddress,
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gatewayAddr: gatewayAddress,
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ctx: ctx,
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mux: http.NewServeMux(),
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allowedOrigins: allowedOrigins,
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}
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}
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// Start the gateway service. This serves the HTTP JSON traffic.
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func (g *Gateway) Start() {
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ctx, cancel := context.WithCancel(g.ctx)
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g.cancel = cancel
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gwmux := gwruntime.NewServeMux(
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gwruntime.WithMarshalerOption(
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gwruntime.MIMEWildcard,
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&gwruntime.JSONPb{OrigName: false},
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),
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)
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opts := []grpc.DialOption{grpc.WithInsecure()}
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handlers := []func(context.Context, *gwruntime.ServeMux, string, []grpc.DialOption) error{
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pb.RegisterAuthHandlerFromEndpoint,
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pb.RegisterWalletHandlerFromEndpoint,
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pb.RegisterHealthHandlerFromEndpoint,
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pb.RegisterAccountsHandlerFromEndpoint,
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}
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for _, h := range handlers {
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if err := h(ctx, gwmux, g.remoteAddr, opts); err != nil {
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log.Fatalf("Could not register API handler with grpc endpoint: %v", err)
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}
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}
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g.mux.Handle("/", g.corsMiddleware(gwmux))
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g.server = &http.Server{
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Addr: g.gatewayAddr,
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Handler: g.mux,
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}
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go func() {
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log.WithField("address", g.gatewayAddr).Info("Starting gRPC gateway")
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if err := g.server.ListenAndServe(); err != http.ErrServerClosed {
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log.WithError(err).Error("Failed to listen and serve")
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g.startFailure = err
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return
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}
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}()
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return
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}
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// Status of grpc gateway. Returns an error if this service is unhealthy.
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func (g *Gateway) Status() error {
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if g.startFailure != nil {
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return g.startFailure
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}
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return nil
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}
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// Stop the gateway with a graceful shutdown.
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func (g *Gateway) Stop() error {
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if err := g.server.Shutdown(g.ctx); err != nil {
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log.WithError(err).Error("Failed to shut down server")
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}
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if g.cancel != nil {
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g.cancel()
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}
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return nil
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}
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func (g *Gateway) corsMiddleware(h http.Handler) http.Handler {
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c := cors.New(cors.Options{
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AllowedOrigins: g.allowedOrigins,
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AllowedMethods: []string{http.MethodPost, http.MethodGet, http.MethodOptions},
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AllowCredentials: true,
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MaxAge: 600,
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AllowedHeaders: []string{"*"},
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})
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return c.Handler(h)
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}
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