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|
package util
import (
"fmt"
"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() *grpc.Server {
return grpc.NewServer(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
}))
}
func GrpcDial(address string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
opts = append(opts, grpc.WithInsecure())
opts = append(opts, grpc.WithKeepaliveParams(keepalive.ClientParameters{
Time: 30 * time.Second, // client ping server if no activity for this long
Timeout: 20 * time.Second,
}))
return grpc.Dial(address, opts...)
}
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
}
|
