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grpc2_server.go
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grpc2_server.go
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package main
import (
"coursera/microservices/grpc/session"
"fmt"
"log"
"net"
"time"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/tap"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
// UnaryInterceptor: RPC decorator on server side
func authInterceptor(
ctx context.Context,
req interface{},
info *grpc.UnaryServerInfo,
handler grpc.UnaryHandler,
) (interface{}, error) {
start := time.Now()
md, _ := metadata.FromIncomingContext(ctx)
reply, err := handler(ctx, req)
fmt.Printf(`--
after incoming call=%v
req=%#v
reply=%#v
time=%v
md=%v
err=%v
`, info.FullMethod, req, reply, time.Since(start), md, err)
return reply, err
}
// InTapHandle: on connect, lightweight checker
func rateLimiter(ctx context.Context, info *tap.Info) (context.Context, error) {
fmt.Printf("--\ncheck ratelim for %s\n", info.FullMethodName)
return ctx, nil
}
func main() {
lis, err := net.Listen("tcp", ":8081")
if err != nil {
log.Fatalln("cant listet port", err)
}
server := grpc.NewServer(
grpc.UnaryInterceptor(authInterceptor),
grpc.InTapHandle(rateLimiter),
)
session.RegisterAuthCheckerServer(server, NewSessionManager())
fmt.Println("starting server at :8081")
server.Serve(lis)
}