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admin.go
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admin.go
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package admin
import (
"context"
"net"
"net/http"
grpc_zap "github.com/grpc-ecosystem/go-grpc-middleware/logging/zap"
grpc_prometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
"github.com/grpc-ecosystem/grpc-gateway/runtime"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"github.com/DrmagicE/gmqtt/config"
"github.com/DrmagicE/gmqtt/server"
)
var _ server.Plugin = (*Admin)(nil)
const Name = "admin"
func init() {
server.RegisterPlugin(Name, New)
config.RegisterDefaultPluginConfig(Name, &DefaultConfig)
}
func New(config config.Config) (server.Plugin, error) {
cfg := config.Plugins[Name].(*Config)
return &Admin{
config: *cfg,
}, nil
}
var log *zap.Logger
// GRPCGatewayRegister provides the ability to share the gRPC and HTTP server to other plugins.
type GRPCGatewayRegister interface {
GRPCRegister
HTTPRegister
}
// GRPCRegister is the interface that enable the implement to expose gRPC endpoint.
type GRPCRegister interface {
// RegisterGRPC registers the gRPC handler into gRPC server which created by admin plugin.
RegisterGRPC(s grpc.ServiceRegistrar)
}
// HTTPRegister is the interface that enable the implement to expose HTTP endpoint.
type HTTPRegister interface {
// RegisterHTTP registers the http handler into http server which created by admin plugin.
RegisterHTTP(ctx context.Context, mux *runtime.ServeMux, endpoint string, opts []grpc.DialOption) (err error)
}
// Admin providers gRPC and HTTP API that enables the external system to interact with the broker.
type Admin struct {
config Config
httpServer *http.Server
grpcServer *grpc.Server
statsReader server.StatsReader
publisher server.Publisher
clientService server.ClientService
store *store
}
func (a *Admin) registerHTTP(mux *runtime.ServeMux) (err error) {
err = RegisterClientServiceHandlerFromEndpoint(
context.Background(),
mux,
a.config.GRPC.Addr,
[]grpc.DialOption{grpc.WithInsecure()},
)
if err != nil {
return err
}
err = RegisterSubscriptionServiceHandlerFromEndpoint(
context.Background(),
mux,
a.config.GRPC.Addr,
[]grpc.DialOption{grpc.WithInsecure()},
)
if err != nil {
return err
}
err = RegisterPublishServiceHandlerFromEndpoint(
context.Background(),
mux,
a.config.GRPC.Addr,
[]grpc.DialOption{grpc.WithInsecure()},
)
if err != nil {
return err
}
httpServer := &http.Server{
Handler: mux,
Addr: a.config.HTTP.Addr,
}
a.httpServer = httpServer
go func() {
err := httpServer.ListenAndServe()
if err != nil && err != http.ErrServerClosed {
panic(err)
}
}()
return nil
}
func (a *Admin) Load(service server.Server) error {
log = server.LoggerWithField(zap.String("plugin", Name))
s := grpc.NewServer(
grpc.ChainUnaryInterceptor(
grpc_zap.UnaryServerInterceptor(log, grpc_zap.WithLevels(func(code codes.Code) zapcore.Level {
if code == codes.OK {
return zapcore.DebugLevel
}
return grpc_zap.DefaultClientCodeToLevel(code)
})),
grpc_prometheus.UnaryServerInterceptor),
)
a.grpcServer = s
RegisterClientServiceServer(s, &clientService{a: a})
RegisterSubscriptionServiceServer(s, &subscriptionService{a: a})
RegisterPublishServiceServer(s, &publisher{a: a})
mux := runtime.NewServeMux(runtime.WithMarshalerOption(runtime.MIMEWildcard, &runtime.JSONPb{OrigName: true, EmitDefaults: true}))
if a.config.HTTP.Enable {
err := a.registerHTTP(mux)
if err != nil {
return err
}
}
for _, v := range service.Plugins() {
if v, ok := v.(GRPCRegister); ok {
v.RegisterGRPC(s)
}
if v, ok := v.(HTTPRegister); a.config.HTTP.Enable && ok {
err := v.RegisterHTTP(context.Background(),
mux,
a.config.GRPC.Addr,
[]grpc.DialOption{grpc.WithInsecure()})
if err != nil {
return err
}
}
}
l, err := net.Listen("tcp", a.config.GRPC.Addr)
if err != nil {
return err
}
grpc_prometheus.Register(s)
a.statsReader = service.StatsManager()
a.store = newStore(a.statsReader)
a.store.subscriptionService = service.SubscriptionService()
a.publisher = service.Publisher()
a.clientService = service.ClientService()
go func() {
err := s.Serve(l)
if err != nil {
panic(err)
}
}()
return err
}
func (a *Admin) Unload() error {
if a.httpServer != nil {
_ = a.httpServer.Shutdown(context.Background())
}
a.grpcServer.Stop()
return nil
}
func (a *Admin) Name() string {
return Name
}