mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-14 10:20:20 +00:00
133 lines
3.8 KiB
Go
133 lines
3.8 KiB
Go
/*
|
|
Copyright 2021 The Ceph-CSI Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package server
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"net"
|
|
"net/url"
|
|
"os"
|
|
|
|
"google.golang.org/grpc"
|
|
|
|
csicommon "github.com/ceph/ceph-csi/internal/csi-common"
|
|
"github.com/ceph/ceph-csi/internal/util/log"
|
|
)
|
|
|
|
var ErrNoUDS = errors.New("no UNIX domain socket")
|
|
|
|
// CSIAddonsService is the interface that is required to be implemented so that
|
|
// the CSIAddonsServer can register the service by calling RegisterService().
|
|
type CSIAddonsService interface {
|
|
// RegisterService is called by the CSIAddonsServer to add a CSI-Addons
|
|
// service that can handle requests.
|
|
RegisterService(server grpc.ServiceRegistrar)
|
|
}
|
|
|
|
// CSIAddonsServer is the gRPC server that listens on an endpoint (UNIX domain
|
|
// socket) where the CSI-Addons requests come in.
|
|
type CSIAddonsServer struct {
|
|
// URL components to listen on the UNIX domain socket
|
|
scheme string
|
|
path string
|
|
|
|
// state of the CSIAddonsServer
|
|
server *grpc.Server
|
|
services []CSIAddonsService
|
|
}
|
|
|
|
// NewCSIAddonsServer create a new CSIAddonsServer on the given endpoint. The
|
|
// endpoint should be a URL. Only UNIX domain sockets are supported.
|
|
func NewCSIAddonsServer(endpoint string) (*CSIAddonsServer, error) {
|
|
cas := &CSIAddonsServer{}
|
|
|
|
if cas.services == nil {
|
|
cas.services = make([]CSIAddonsService, 0)
|
|
}
|
|
|
|
u, err := url.Parse(endpoint)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if u.Scheme != "unix" {
|
|
return nil, fmt.Errorf("%w: %s", ErrNoUDS, endpoint)
|
|
}
|
|
|
|
cas.scheme = u.Scheme
|
|
cas.path = u.Path
|
|
|
|
return cas, nil
|
|
}
|
|
|
|
// RegisterService takes the CSIAddonsService and registers it with the
|
|
// CSIAddonsServer gRPC server. This function should be called before Start,
|
|
// where the services are registered on the internal gRPC server.
|
|
func (cas *CSIAddonsServer) RegisterService(svc CSIAddonsService) {
|
|
cas.services = append(cas.services, svc)
|
|
}
|
|
|
|
// Start creates the internal gRPC server, and registers the CSIAddonsServices.
|
|
// The internal gRPC server is started in it's own go-routine when no error is
|
|
// returned.
|
|
func (cas *CSIAddonsServer) Start() error {
|
|
// create the gRPC server and register services
|
|
cas.server = grpc.NewServer(csicommon.NewMiddlewareServerOption(false))
|
|
|
|
for _, svc := range cas.services {
|
|
svc.RegisterService(cas.server)
|
|
}
|
|
|
|
// setup the UNIX domain socket
|
|
if e := os.Remove(cas.path); e != nil && !os.IsNotExist(e) {
|
|
return fmt.Errorf("failed to remove %q: %w", cas.path, e)
|
|
}
|
|
|
|
listener, err := net.Listen(cas.scheme, cas.path)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to listen on %q: %w", cas.path, err)
|
|
}
|
|
|
|
go cas.serve(listener)
|
|
|
|
return nil
|
|
}
|
|
|
|
// serve starts the actual process of listening for requests on the gRPC
|
|
// server. This is a blocking call, so it should get executed in a go-routine.
|
|
func (cas *CSIAddonsServer) serve(listener net.Listener) {
|
|
log.DefaultLog("listening for CSI-Addons requests on address: %#v", listener.Addr())
|
|
|
|
// start to serve requests
|
|
err := cas.server.Serve(listener)
|
|
if err != nil && !errors.Is(err, grpc.ErrServerStopped) {
|
|
log.FatalLogMsg("failed to setup CSI-Addons server: %v", err)
|
|
}
|
|
|
|
log.DefaultLog("the CSI-Addons server at %q has been stopped", listener.Addr())
|
|
}
|
|
|
|
// Stop can be used to stop the internal gRPC server.
|
|
func (cas *CSIAddonsServer) Stop() {
|
|
if cas.server == nil {
|
|
return
|
|
}
|
|
|
|
cas.server.GracefulStop()
|
|
}
|