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gateway.go
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gateway.go
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package net
import (
"context"
"net/http"
"time"
"google.golang.org/grpc"
"github.com/drand/drand/protobuf/drand"
)
// PrivateGateway is the main interface to communicate to other drand nodes. It
// acts as a listener to receive incoming requests and acts a client connecting
// to drand particpants.
// The gateway fixes all drand functionalities offered by drand.
type PrivateGateway struct {
Listener
ProtocolClient
PublicClient
}
// StartAll starts the control and public functionalities of the node
func (g *PrivateGateway) StartAll() {
go g.Listener.Start()
}
// StopAll stops the control and public functionalities of the node
func (g *PrivateGateway) StopAll(ctx context.Context) {
g.Listener.Stop(ctx)
if s, ok := g.ProtocolClient.(Stoppable); ok {
s.Stop()
}
}
// Listener is the active listener for incoming requests.
type Listener interface {
Start()
Stop(ctx context.Context)
Addr() string
}
// Service holds all functionalities that a drand node should implement
type Service interface {
drand.PublicServer
drand.ControlServer
drand.ProtocolServer
}
// NewGRPCPrivateGateway returns a grpc gateway listening on "listen" for the
// public methods, listening on "port" for the control methods, using the given
// Service s with the given options.
func NewGRPCPrivateGateway(ctx context.Context,
listen, certPath, keyPath string,
certs *CertManager,
s Service,
insecure bool,
opts ...grpc.DialOption) (*PrivateGateway, error) {
l, err := NewGRPCListenerForPrivate(ctx, listen, certPath, keyPath, s, insecure, grpc.ConnectionTimeout(time.Second))
if err != nil {
return nil, err
}
pg := &PrivateGateway{
Listener: l,
}
if !insecure {
pg.ProtocolClient = NewGrpcClientFromCertManager(certs, opts...)
} else {
pg.ProtocolClient = NewGrpcClient(opts...)
}
// duplication since client implements both...
// XXX Find a better fix
pg.PublicClient = pg.ProtocolClient.(*grpcClient)
return pg, nil
}
// PublicGateway is the main interface to communicate to users.
// The gateway fixes all drand functionalities offered by drand.
type PublicGateway struct {
Listener
}
// StartAll starts the control and public functionalities of the node
func (g *PublicGateway) StartAll() {
go g.Listener.Start()
}
// StopAll stops the control and public functionalities of the node
func (g *PublicGateway) StopAll(ctx context.Context) {
g.Listener.Stop(ctx)
}
// NewRESTPublicGateway returns a grpc gateway listening on "listen" for the
// public methods, listening on "port" for the control methods, using the given
// Service s with the given options.
func NewRESTPublicGateway(
ctx context.Context,
listen, certPath, keyPath string,
certs *CertManager,
handler http.Handler,
insecure bool) (*PublicGateway, error) {
l, err := NewRESTListenerForPublic(ctx, listen, certPath, keyPath, handler, insecure)
if err != nil {
return nil, err
}
return &PublicGateway{Listener: l}, nil
}