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grpc_lb_server.go
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grpc_lb_server.go
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package main
import (
"coursera/microservices/grpc/session"
"flag"
"fmt"
"log"
"net"
"strconv"
"google.golang.org/grpc"
consulapi "github.com/hashicorp/consul/api"
)
var (
// command line parameters, consul address; our service address
grpcPort = flag.Int("grpc", 8081, "listen addr")
consulAddr = flag.String("consul", "192.168.99.100:32769", "consul addr (8500 in original consul)")
)
/*
go run *.go --grpc="8081" --consul="192.168.99.100:32769"
go run *.go --grpc="8082" --consul="192.168.99.100:32769"
*/
func main() {
flag.Parse() // commandline params
port := strconv.Itoa(*grpcPort)
serviceID := "SAPI_127.0.0.1:" + port // our service ID string
// setup service
lis, err := net.Listen("tcp", ":"+port)
if err != nil {
log.Fatalln("cant listen port", err)
}
server := grpc.NewServer()
session.RegisterAuthCheckerServer(server, NewSessionManager(port))
fmt.Println("starting server at " + port)
go server.Serve(lis)
// ask consul to register service
config := consulapi.DefaultConfig()
config.Address = *consulAddr
consul, err := consulapi.NewClient(config)
err = consul.Agent().ServiceRegister(&consulapi.AgentServiceRegistration{
ID: serviceID,
Name: "session-api",
Port: *grpcPort,
Address: "127.0.0.1",
})
if err != nil {
fmt.Println("cant add service to consul", err)
return
}
fmt.Println("registered in consul", serviceID)
// on exit: remove record from consul
defer func() {
err := consul.Agent().ServiceDeregister(serviceID)
if err != nil {
fmt.Println("cant add service to consul", err)
return
}
fmt.Println("deregistered in consul", serviceID)
}()
fmt.Println("Press any key to exit")
fmt.Scanln()
}