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service.go
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service.go
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package grpc
import (
"crypto/tls"
"crypto/x509"
"fmt"
"os"
pb "github.com/edobtc/cloudkit/rpc/controlplane/resources/v1"
"github.com/edobtc/cloudkit/runtime"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
type ResourcesServiceServer struct {
Close chan os.Signal
Error chan error
runtime *runtime.Runtime
pb.UnimplementedResourcesServer
}
func NewResourcesServiceServer() *ResourcesServiceServer {
return &ResourcesServiceServer{
Close: make(chan os.Signal),
Error: make(chan error),
}
}
func NewTlSServer() (*grpc.Server, error) {
tlsCredentials, err := LoadTLSCredentials()
if err != nil {
return nil, err
}
grpcServer := grpc.NewServer(
grpc.Creds(tlsCredentials),
)
return grpcServer, nil
}
func LoadTLSCredentials() (credentials.TransportCredentials, error) {
// Load server's certificate and private key
serverCert, err := tls.LoadX509KeyPair("cert/server-cert.pem", "cert/server-key.pem")
if err != nil {
return nil, err
}
// Create the credentials and return it
config := &tls.Config{
Certificates: []tls.Certificate{serverCert},
ClientAuth: tls.NoClientCert,
}
return credentials.NewTLS(config), nil
}
func LoadTLSClientCredentials() (credentials.TransportCredentials, error) {
// Load certificate of the CA who signed server's certificate
pemServerCA, err := os.ReadFile("cert/ca-cert.pem")
if err != nil {
return nil, err
}
certPool := x509.NewCertPool()
if !certPool.AppendCertsFromPEM(pemServerCA) {
return nil, fmt.Errorf("failed to add server CA's certificate")
}
// Create the credentials and return it
config := &tls.Config{
RootCAs: certPool,
}
return credentials.NewTLS(config), nil
}