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server.go
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server.go
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package server
import (
"context"
"errors"
"flag"
"fmt"
"net"
"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
"google.golang.org/grpc"
"google.golang.org/grpc/reflection"
servermiddleware "github.com/sdinsure/agent/pkg/grpc/server/middleware"
loggermiddleware "github.com/sdinsure/agent/pkg/grpc/server/middleware/logger"
metricmiddleware "github.com/sdinsure/agent/pkg/grpc/server/middleware/metrics"
recoverymiddleware "github.com/sdinsure/agent/pkg/grpc/server/middleware/recovery"
pkglogger "github.com/sdinsure/agent/pkg/logger"
)
var withReflection = flag.Bool("with_grpc_reflection", false, "turn on grpc reflection")
type GrpcServerConfigurer interface {
apply(o *grpcServerConfig)
}
type grpcServerConfig struct {
grpcPort int
serverOpts []grpc.ServerOption
unaryInterceptors []grpc.UnaryServerInterceptor
streamInterceptors []grpc.StreamServerInterceptor
logger pkglogger.Logger
}
type withGrpcPort struct {
grpcPort int
}
var (
_ GrpcServerConfigurer = withGrpcPort{}
)
func (w withGrpcPort) apply(o *grpcServerConfig) {
o.grpcPort = w.grpcPort
}
func WithGrpcPort(p int) withGrpcPort {
return withGrpcPort{grpcPort: p}
}
type interceptorConfigure struct {
unaryInterceptors []grpc.UnaryServerInterceptor
streamInterceptors []grpc.StreamServerInterceptor
}
var (
_ GrpcServerConfigurer = interceptorConfigure{}
)
func (i interceptorConfigure) apply(o *grpcServerConfig) {
o.unaryInterceptors = i.unaryInterceptors
o.streamInterceptors = i.streamInterceptors
}
func WithInterceptor(unary []grpc.UnaryServerInterceptor, stream []grpc.StreamServerInterceptor) interceptorConfigure {
return interceptorConfigure{
unaryInterceptors: unary,
streamInterceptors: stream,
}
}
type grpcServerOption struct {
serverOpts []grpc.ServerOption
}
var (
_ GrpcServerConfigurer = grpcServerOption{}
)
func (g grpcServerOption) apply(o *grpcServerConfig) {
o.serverOpts = g.serverOpts
}
func WithGrpcServerOption(serverOpts ...grpc.ServerOption) grpcServerOption {
return grpcServerOption{serverOpts: serverOpts}
}
type serverLogger struct {
logger pkglogger.Logger
}
var (
_ GrpcServerConfigurer = serverLogger{}
)
func (g serverLogger) apply(o *grpcServerConfig) {
o.logger = g.logger
}
func WithLogger(logger pkglogger.Logger) serverLogger {
return serverLogger{logger: logger}
}
func newConfig(cfgs ...GrpcServerConfigurer) *grpcServerConfig {
o := &grpcServerConfig{}
for _, cfg := range cfgs {
cfg.apply(o)
}
return o
}
func NewGrpcServer(cfgs ...GrpcServerConfigurer) *GrpcServer {
config := newConfig(cfgs...)
beforeMiddlewares := servermiddleware.MultiServerMiddleware(
[]servermiddleware.ServerMiddleware{
loggermiddleware.NewTagMiddlware(),
metricmiddleware.NewMetricMiddleware(),
})
afterMiddlewares := servermiddleware.MultiServerMiddleware(
[]servermiddleware.ServerMiddleware{
loggermiddleware.NewLoggerMiddleware(config.logger),
recoverymiddleware.NewPanicRecoveryMiddleware(),
})
unaryInterceptorsSlice := appendMulti(
beforeMiddlewares.UnaryServerInterceptor(),
config.unaryInterceptors,
afterMiddlewares.UnaryServerInterceptor())
streamInterceptorsSlice := appendMulti(
beforeMiddlewares.StreamServerInterceptor(),
config.streamInterceptors,
afterMiddlewares.StreamServerInterceptor())
var svrOpts []grpc.ServerOption = append(config.serverOpts,
grpc.ChainUnaryInterceptor(unaryInterceptorsSlice...),
grpc.ChainStreamInterceptor(streamInterceptorsSlice...),
grpc.StatsHandler(otelgrpc.NewServerHandler()),
)
grpcServer := grpc.NewServer(svrOpts...)
if *withReflection {
// Register reflection service on gRPC server.
reflection.Register(grpcServer)
}
return &GrpcServer{
logger: config.logger,
Server: grpcServer,
config: config,
}
}
func appendMulti[T any](slices ...[]T) []T {
var result []T
for _, s := range slices {
result = append(result, s...)
}
return result
}
type GrpcServer struct {
config *grpcServerConfig
logger pkglogger.Logger
*grpc.Server
// listenerAddr was setted when the grpc server is up and running
listenerAddr net.Addr
}
func (g *GrpcServer) ListenAndServe() error {
var lc net.ListenConfig
grpcAddr := fmt.Sprintf(":%d", g.config.grpcPort) // dial any port
li, err := lc.Listen(context.Background(), "tcp", grpcAddr)
if err != nil {
return err
}
g.listenerAddr = li.Addr()
g.logger.Info("grpc: listen and serve %s\n", li.Addr().String())
return g.Server.Serve(li)
}
func (g *GrpcServer) LocalAddr() (string, error) {
var addr string
var err error
if g.listenerAddr != nil {
addr = g.listenerAddr.String()
} else if g.config.grpcPort > 0 {
addr = fmt.Sprintf("127.0.0.1:%d", g.config.grpcPort)
} else {
err = errors.New("localaddr is not ready")
}
g.logger.Info("grpc local addr:%s\n", addr)
return addr, err
}
func (g *GrpcServer) GracefulStop() {
g.Server.GracefulStop()
}