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server.go
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server.go
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package grpcutil
import (
"fmt"
"net"
"net/http"
grpcgw "github.com/grpc-ecosystem/grpc-gateway/runtime"
"github.com/improbable-eng/grpc-web/go/grpcweb"
ma "github.com/multiformats/go-multiaddr"
manet "github.com/multiformats/go-multiaddr/net"
"google.golang.org/grpc"
)
// BertyCustomPrefix is a multiformat custom prefix
const BertyCustomPrefix = 0xbe00
const (
P_GRPC = BertyCustomPrefix + 0x0002 //nolint:golint
P_GRPC_WEB = BertyCustomPrefix + 0x0004 //nolint:golint
P_GRPC_WEBSOCKET = BertyCustomPrefix + 0x0008 //nolint:golint
P_GRPC_GATEWAY = BertyCustomPrefix + 0x0016 //nolint:golint
)
var protos = []ma.Protocol{
{
Name: "grpc",
Code: P_GRPC,
VCode: ma.CodeToVarint(P_GRPC),
},
{
Name: "grpcweb",
Code: P_GRPC_WEB,
VCode: ma.CodeToVarint(P_GRPC_WEB),
},
{
Name: "grpcws",
Code: P_GRPC_WEBSOCKET,
VCode: ma.CodeToVarint(P_GRPC_WEBSOCKET),
},
{
Name: "grpcgw",
Code: P_GRPC_GATEWAY,
VCode: ma.CodeToVarint(P_GRPC_GATEWAY),
},
}
type Listener interface {
manet.Listener
GRPCMultiaddr() ma.Multiaddr
}
type listener struct {
manet.Listener
grpcProtocol ma.Multiaddr
}
func Listen(maddr ma.Multiaddr) (Listener, error) {
var (
maListener manet.Listener
component *ma.Component
err error
)
component, _ = ma.NewComponent("grpc", "") // default to grpc
ma.ForEach(maddr, func(c ma.Component) bool {
switch c.Protocol().Code {
case ma.P_IP4, ma.P_IP6, ma.P_TCP, ma.P_UNIX: // skip (supported protocol)
case P_GRPC, P_GRPC_WEB, P_GRPC_WEBSOCKET, P_GRPC_GATEWAY:
component = &c
default:
err = fmt.Errorf("protocol not supported: %s", c.Protocol().Name)
return false // end
}
return true // continue
})
if err != nil {
return nil, err
}
var grpcProtocol ma.Multiaddr
if grpcProtocol, err = ma.NewMultiaddrBytes(component.Bytes()); err != nil {
return nil, err
}
maddr = maddr.Decapsulate(grpcProtocol)
if maListener, err = manet.Listen(maddr); err != nil {
return nil, err
}
l := listener{maListener, grpcProtocol}
return &l, nil
}
func (l *listener) GRPCMultiaddr() ma.Multiaddr {
return l.Listener.Multiaddr().Encapsulate(l.grpcProtocol)
}
type Server struct {
GRPCServer *grpc.Server
GatewayMux *grpcgw.ServeMux
}
func (s *Server) Serve(l Listener) error {
var serve func(net.Listener) error
var err error
ma.ForEach(l.GRPCMultiaddr(), func(c ma.Component) bool {
switch c.Protocol().Code {
case P_GRPC:
serve = s.GRPCServer.Serve
case P_GRPC_WEB, P_GRPC_WEBSOCKET:
wgrpc := grpcweb.WrapServer(s.GRPCServer,
grpcweb.WithOriginFunc(func(string) bool { return true }), // @FIXME: this is very insecure
grpcweb.WithWebsockets(P_GRPC_WEBSOCKET == c.Protocol().Code),
)
serverWeb := http.Server{
Handler: http.HandlerFunc(wgrpc.ServeHTTP),
}
serve = serverWeb.Serve
case P_GRPC_GATEWAY:
if s.GatewayMux == nil {
err = fmt.Errorf("grpc gateway: no server mux was given")
return false
}
gatewayServer := http.Server{
Handler: s.GatewayMux,
}
serve = gatewayServer.Serve
default:
return true // continue
}
return false // end
})
if err != nil {
return fmt.Errorf("unable to serve: %s", err)
}
if serve == nil {
return fmt.Errorf("unable to find a way to serve: %s", l.GRPCMultiaddr())
}
return serve(manet.NetListener(l))
}
//nolint:gochecknoinits
func init() {
// register protos
for _, proto := range protos {
if err := ma.AddProtocol(proto); err != nil {
panic(err)
}
}
}