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main.go
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main.go
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// author: Gary A. Stafford
// site: https://programmaticponderings.com
// license: MIT License
// purpose: Service G - gRPC
package main
import (
"context"
"github.com/banzaicloud/logrus-runtime-formatter"
"github.com/google/uuid"
log "github.com/sirupsen/logrus"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
"google.golang.org/grpc"
"net"
"os"
"time"
pb "github.com/garystafford/pb-greeting"
)
const (
port = ":50051"
)
type greetingServiceServer struct {
}
var (
greetings []*pb.Greeting
)
func (s *greetingServiceServer) Greeting(ctx context.Context, req *pb.GreetingRequest) (*pb.GreetingResponse, error) {
greetings = nil
tmpGreeting := pb.Greeting{
Id: uuid.New().String(),
Service: "Service-G",
Message: "Ahlan, from Service-G!",
Created: time.Now().Local().String(),
}
greetings = append(greetings, &tmpGreeting)
CallMongoDB(tmpGreeting)
return &pb.GreetingResponse{
Greeting: greetings,
}, nil
}
func CallMongoDB(greeting pb.Greeting) {
log.Info(greeting)
ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
client, err := mongo.Connect(ctx, options.Client().ApplyURI(os.Getenv("MONGO_CONN")))
if err != nil {
log.Error(err)
}
defer client.Disconnect(nil)
collection := client.Database("service-g").Collection("greetings")
ctx, _ = context.WithTimeout(context.Background(), 5*time.Second)
_, err = collection.InsertOne(ctx, greeting)
if err != nil {
log.Error(err)
}
}
func getEnv(key, fallback string) string {
if value, ok := os.LookupEnv(key); ok {
return value
}
return fallback
}
func init() {
formatter := runtime.Formatter{ChildFormatter: &log.JSONFormatter{}}
formatter.Line = true
log.SetFormatter(&formatter)
log.SetOutput(os.Stdout)
level, err := log.ParseLevel(getEnv("LOG_LEVEL", "info"))
if err != nil {
log.Error(err)
}
log.SetLevel(level)
}
func main() {
lis, err := net.Listen("tcp", port)
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
s := grpc.NewServer()
pb.RegisterGreetingServiceServer(s, &greetingServiceServer{})
log.Fatal(s.Serve(lis))
}