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65 lines
1.6 KiB
65 lines
1.6 KiB
package util
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import (
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"fmt"
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"sync"
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"time"
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"google.golang.org/grpc"
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"google.golang.org/grpc/keepalive"
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)
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var (
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// cache grpc connections
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grpcClients = make(map[string]*grpc.ClientConn)
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grpcClientsLock sync.Mutex
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)
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func NewGrpcServer() *grpc.Server {
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return grpc.NewServer(grpc.KeepaliveParams(keepalive.ServerParameters{
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Time: 10 * time.Second, // wait time before ping if no activity
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Timeout: 20 * time.Second, // ping timeout
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}), grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
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MinTime: 60 * time.Second, // min time a client should wait before sending a ping
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}))
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}
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func GrpcDial(address string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
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opts = append(opts, grpc.WithInsecure())
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opts = append(opts, grpc.WithKeepaliveParams(keepalive.ClientParameters{
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Time: 30 * time.Second, // client ping server if no activity for this long
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Timeout: 20 * time.Second,
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}))
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return grpc.Dial(address, opts...)
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}
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func WithCachedGrpcClient(fn func(*grpc.ClientConn) error, address string, opts ...grpc.DialOption) error {
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grpcClientsLock.Lock()
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existingConnection, found := grpcClients[address]
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if found {
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grpcClientsLock.Unlock()
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return fn(existingConnection)
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}
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grpcConnection, err := GrpcDial(address, opts...)
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if err != nil {
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grpcClientsLock.Unlock()
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return fmt.Errorf("fail to dial %s: %v", address, err)
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}
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grpcClients[address] = grpcConnection
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grpcClientsLock.Unlock()
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err = fn(grpcConnection)
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if err != nil {
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grpcClientsLock.Lock()
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delete(grpcClients, address)
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grpcClientsLock.Unlock()
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}
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return err
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}
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