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package util
import ( "context" "fmt" "net/http" "strconv" "strings" "sync" "time"
"google.golang.org/grpc" "google.golang.org/grpc/keepalive" )
var ( // cache grpc connections
grpcClients = make(map[string]*grpc.ClientConn) grpcClientsLock sync.Mutex )
func init() { http.DefaultTransport.(*http.Transport).MaxIdleConnsPerHost = 1024 }
func NewGrpcServer(opts ...grpc.ServerOption) *grpc.Server { var options []grpc.ServerOption options = append(options, grpc.KeepaliveParams(keepalive.ServerParameters{ Time: 10 * time.Second, // wait time before ping if no activity
Timeout: 20 * time.Second, // ping timeout
}), grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{ MinTime: 60 * time.Second, // min time a client should wait before sending a ping
})) for _, opt := range opts { if opt != nil { options = append(options, opt) } } return grpc.NewServer(options...) }
func GrpcDial(ctx context.Context, address string, opts ...grpc.DialOption) (*grpc.ClientConn, error) { // opts = append(opts, grpc.WithBlock())
// opts = append(opts, grpc.WithTimeout(time.Duration(5*time.Second)))
var options []grpc.DialOption options = append(options, // grpc.WithInsecure(),
grpc.WithKeepaliveParams(keepalive.ClientParameters{ Time: 30 * time.Second, // client ping server if no activity for this long
Timeout: 20 * time.Second, })) for _, opt := range opts { if opt != nil { options = append(options, opt) } } return grpc.DialContext(ctx, address, options...) }
func WithCachedGrpcClient(ctx context.Context, fn func(context.Context, *grpc.ClientConn) error, address string, opts ...grpc.DialOption) error {
grpcClientsLock.Lock()
existingConnection, found := grpcClients[address] if found { grpcClientsLock.Unlock() err := fn(ctx, existingConnection) if err != nil { grpcClientsLock.Lock() delete(grpcClients, address) grpcClientsLock.Unlock() existingConnection.Close() } return err }
grpcConnection, err := GrpcDial(ctx, address, opts...) if err != nil { grpcClientsLock.Unlock() return fmt.Errorf("fail to dial %s: %v", address, err) }
grpcClients[address] = grpcConnection grpcClientsLock.Unlock()
err = fn(ctx, grpcConnection) if err != nil { grpcClientsLock.Lock() delete(grpcClients, address) grpcClientsLock.Unlock() grpcConnection.Close() }
return err }
func ParseServerToGrpcAddress(server string) (serverGrpcAddress string, err error) { colonIndex := strings.LastIndex(server, ":") if colonIndex < 0 { return "", fmt.Errorf("server should have hostname:port format: %v", server) }
port, parseErr := strconv.ParseUint(server[colonIndex+1:], 10, 64) if parseErr != nil { return "", fmt.Errorf("server port parse error: %v", parseErr) }
grpcPort := int(port) + 10000
return fmt.Sprintf("%s:%d", server[:colonIndex], grpcPort), nil }
func ServerToGrpcAddress(server string) (serverGrpcAddress string) { hostnameAndPort := strings.Split(server, ":") if len(hostnameAndPort) != 2 { return fmt.Sprintf("unexpected server address: %s", server) }
port, parseErr := strconv.ParseUint(hostnameAndPort[1], 10, 64) if parseErr != nil { return fmt.Sprintf("failed to parse port for %s:%s", hostnameAndPort[0], hostnameAndPort[1]) }
grpcPort := int(port) + 10000
return fmt.Sprintf("%s:%d", hostnameAndPort[0], grpcPort) }
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