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grpc_runner.go
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grpc_runner.go
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package csi
import (
"context"
"net"
"os"
"time"
"google.golang.org/grpc"
"sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager"
)
type gRPCServerRunner struct {
srv *grpc.Server
sockFile string
leaderElection bool
}
var _ manager.LeaderElectionRunnable = gRPCServerRunner{}
// NewGRPCRunner creates controller-runtime's manager.Runnable for a gRPC server.
// The server will listen on UNIX domain socket at sockFile.
// If leaderElection is true, the server will run only when it is elected as leader.
func NewGRPCRunner(srv *grpc.Server, sockFile string, leaderElection bool) manager.Runnable {
return gRPCServerRunner{srv, sockFile, leaderElection}
}
// Start implements controller-runtime's manager.Runnable.
func (r gRPCServerRunner) Start(ctx context.Context) error {
logger := log.FromContext(ctx)
logger.Info("Starting gRPC server", "sockFile", r.sockFile)
err := os.Remove(r.sockFile)
if err != nil && !os.IsNotExist(err) {
return err
}
lis, err := net.Listen("unix", r.sockFile)
if err != nil {
return err
}
go func() {
if err := r.srv.Serve(lis); err != nil {
logger.Error(err, "gRPC server error")
}
}()
<-ctx.Done()
logger.Info("Stopping gRPC server")
start := time.Now()
end := make(chan any, 1)
go func() {
r.srv.GracefulStop()
end <- nil
}()
select {
case <-end:
logger.Info("Stopped gRPC server gracefully", "duration", time.Since(start))
case <-time.After(10 * time.Second):
r.srv.Stop()
logger.Info("Stopped gRPC server forcibly", "duration", time.Since(start))
}
return nil
}
// NeedLeaderElection implements controller-runtime's manager.LeaderElectionRunnable.
func (r gRPCServerRunner) NeedLeaderElection() bool {
return r.leaderElection
}