/
app.go
85 lines (70 loc) · 1.96 KB
/
app.go
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package app
import (
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/sts"
pb "github.com/bogdanrat/web-server/contracts/proto/database_service"
"github.com/bogdanrat/web-server/service/database/config"
"github.com/bogdanrat/web-server/service/database/db/postgres"
"github.com/bogdanrat/web-server/service/database/handler"
"google.golang.org/grpc"
"log"
"net"
)
var (
listener net.Listener
grpcServer *grpc.Server
)
func Init() error {
var err error
// init app config
config.ReadFlags()
if err = config.ReadConfiguration(); err != nil {
return err
}
// init aws
if err = initAwsSession(config.AppConfig.AWS); err != nil {
return err
}
log.Println("AWS Session initialized.")
// init database
database, err := postgres.NewDatabase()
if err != nil {
return fmt.Errorf("could not establish database connection: %s", err.Error())
}
log.Println("Database connection established.")
// init grpc
listener, err = net.Listen("tcp", config.AppConfig.Service.Address)
if err != nil {
return fmt.Errorf("failed to listen: %v", err)
}
var serverOptions []grpc.ServerOption
grpcServer = grpc.NewServer(serverOptions...)
storageServer := handler.New(database)
pb.RegisterDatabaseServer(grpcServer, storageServer)
return nil
}
func Start() {
log.Printf("gRPC listening on: %s\n", config.AppConfig.Service.Address)
if err := grpcServer.Serve(listener); err != nil {
log.Fatalf("failed to serve: %v", err)
}
}
func initAwsSession(awsConfig config.AWSConfig) error {
sess, err := session.NewSession(&aws.Config{
Region: aws.String(awsConfig.Region),
CredentialsChainVerboseErrors: aws.Bool(true),
})
if err != nil {
return err
}
config.SetAWSSession(sess)
stsService := sts.New(sess)
output, err := stsService.GetCallerIdentity(&sts.GetCallerIdentityInput{})
if err != nil {
return err
}
log.Printf("Caller Identity: %s\n", *output.Arn)
return nil
}