Add initial code framework

cmd/cri-containerd/cri_containerd.go

@@ -0,0 +1,44 @@
+/*
+Copyright 2017 The Kubernetes Authors All rights reserved.
+
+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 main
+
+import (
+	"github.com/golang/glog"
+	"github.com/spf13/pflag"
+
+	"github.com/kubernetes-incubator/cri-containerd/cmd/cri-containerd/options"
+	"github.com/kubernetes-incubator/cri-containerd/pkg/server"
+)
+
+func main() {
+	o := options.NewCRIContainerdOptions()
+	o.AddFlags(pflag.CommandLine)
+	options.InitFlags()
+
+	glog.V(2).Infof("Connect to containerd socket %q with timeout %v", o.ContainerdSocketPath, o.ContainerdConnectionTimeout)
+	conn, err := server.ConnectToContainerd(o.ContainerdSocketPath, o.ContainerdConnectionTimeout)
+	if err != nil {
+		glog.Exitf("Failed to connect containerd socket %q: %v", o.ContainerdSocketPath, err)
+	}
+
+	glog.V(2).Infof("Run cri-containerd grpc server on socket %q", o.CRIContainerdSocketPath)
+	service := server.NewCRIContainerdService(conn)
+	s := server.NewCRIContainerdServer(o.CRIContainerdSocketPath, service, service)
+	if err := s.Run(); err != nil {
+		glog.Exitf("Failed to run cri-containerd grpc server: %v", err)
+	}
+}

cmd/cri-containerd/options/options.go

@@ -0,0 +1,53 @@
+/*
+Copyright 2017 The Kubernetes Authors All rights reserved.
+
+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 options
+
+import (
+	"flag"
+	"time"
+
+	"github.com/spf13/pflag"
+)
+
+// CRIContainerdOptions contains cri-containerd command line options.
+type CRIContainerdOptions struct {
+	// CRIContainerdSocketPath is the path to the socket which cri-containerd serves on.
+	CRIContainerdSocketPath string
+	// ContainerdSocketPath is the path to the containerd socket.
+	ContainerdSocketPath string
+	// ContainerdConnectionTimeout is the connection timeout for containerd client.
+	ContainerdConnectionTimeout time.Duration
+}
+
+func NewCRIContainerdOptions() *CRIContainerdOptions {
+	return &CRIContainerdOptions{}
+}
+
+// AddFlags adds cri-containerd command line options to pflag.
+func (c *CRIContainerdOptions) AddFlags(fs *pflag.FlagSet) {
+	fs.StringVar(&c.CRIContainerdSocketPath, "cri-containerd-socket",
+		"/var/run/cri-containerd.sock", "Path to the socket which cri-containerd serves on.")
+	fs.StringVar(&c.ContainerdSocketPath, "containerd-socket",
+		"/run/containerd/containerd.sock", "Path to the containerd socket.")
+	fs.DurationVar(&c.ContainerdConnectionTimeout, "containerd-connection-timeout",
+		2*time.Minute, "Connection timeout for containerd client.")
+}
+
+func InitFlags() {
+	pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
+	pflag.Parse()
+}