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package util
import (
"fmt"
"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 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(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.Dial(address, options...)
}
func WithCachedGrpcClient(fn func(*grpc.ClientConn) error, address string, opts ...grpc.DialOption) error {
grpcClientsLock.Lock()
existingConnection, found := grpcClients[address]
if found {
grpcClientsLock.Unlock()
return fn(existingConnection)
}
grpcConnection, err := GrpcDial(address, opts...)
if err != nil {
grpcClientsLock.Unlock()
return fmt.Errorf("fail to dial %s: %v", address, err)
}
grpcClients[address] = grpcConnection
grpcClientsLock.Unlock()
err = fn(grpcConnection)
if err != nil {
grpcClientsLock.Lock()
delete(grpcClients, address)
grpcClientsLock.Unlock()
}
return err
}
func ParseServerToGrpcAddress(server string, optionalGrpcPort int) (serverGrpcAddress string, err error) {
hostnameAndPort := strings.Split(server, ":")
if len(hostnameAndPort) != 2 {
return "", fmt.Errorf("server should have hostname:port format: %v", hostnameAndPort)
}
port, parseErr := strconv.ParseUint(hostnameAndPort[1], 10, 64)
if parseErr != nil {
return "", fmt.Errorf("server port parse error: %v", parseErr)
}
grpcPort := int(port) + 10000
if optionalGrpcPort != 0 {
grpcPort = optionalGrpcPort
}
return fmt.Sprintf("%s:%d", hostnameAndPort[0], grpcPort), nil
}
func ServerToGrpcAddress(server string, defaultGrpcPort int) (serverGrpcAddress string) {
hostnameAndPort := strings.Split(server, ":")
if len(hostnameAndPort) != 2 {
return fmt.Sprintf("%s:%d", server, defaultGrpcPort)
}
port, parseErr := strconv.ParseUint(hostnameAndPort[1], 10, 64)
if parseErr != nil {
return fmt.Sprintf("%s:%d", hostnameAndPort[0], defaultGrpcPort)
}
grpcPort := int(port) + 10000
return fmt.Sprintf("%s:%d", hostnameAndPort[0], grpcPort)
}
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