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util.go
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util.go
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/*
Copyright 2017 The Kubernetes 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 main
import (
"encoding/json"
"fmt"
"os"
"sort"
"github.com/urfave/cli"
"google.golang.org/grpc"
pb "k8s.io/kubernetes/pkg/kubelet/apis/cri/v1alpha1"
)
var runtimeClient pb.RuntimeServiceClient
var imageClient pb.ImageServiceClient
var conn *grpc.ClientConn
type listOptions struct {
// id of container or sandbox
id string
// podID of container
podID string
// state of the sandbox
state string
// show verbose info for the sandbox
verbose bool
// labels are selectors for the sandbox
labels map[string]string
}
type execOptions struct {
// id of container
id string
// timeout to stop command
timeout int64
// Whether to exec a command in a tty
tty bool
// Whether to stream stdin
stdin bool
// Command to exec
cmd []string
}
type attachOptions struct {
// id of container
id string
// Whether the stdin is TTY
tty bool
// Whether pass Stdin to container
stdin bool
}
type portforwardOptions struct {
// id of sandbox
id string
// ports to forward
ports []string
}
func getSortedKeys(m map[string]string) []string {
var keys []string
for k := range m {
keys = append(keys, k)
}
sort.Strings(keys)
return keys
}
func loadContainerConfig(path string) (*pb.ContainerConfig, error) {
f, err := openFile(path)
if err != nil {
return nil, err
}
defer f.Close()
var config pb.ContainerConfig
if err := json.NewDecoder(f).Decode(&config); err != nil {
return nil, err
}
return &config, nil
}
func loadPodSandboxConfig(path string) (*pb.PodSandboxConfig, error) {
f, err := openFile(path)
if err != nil {
return nil, err
}
defer f.Close()
var config pb.PodSandboxConfig
if err := json.NewDecoder(f).Decode(&config); err != nil {
return nil, err
}
return &config, nil
}
func openFile(path string) (*os.File, error) {
f, err := os.Open(path)
if err != nil {
if os.IsNotExist(err) {
return nil, fmt.Errorf("config at %s not found", path)
}
return nil, err
}
return f, nil
}
func getRuntimeClient(context *cli.Context) error {
// Set up a connection to the server.
var err error
conn, err = getRuntimeClientConnection(context)
if err != nil {
return fmt.Errorf("failed to connect: %v", err)
}
runtimeClient = pb.NewRuntimeServiceClient(conn)
return nil
}
func getImageClient(context *cli.Context) error {
// Set up a connection to the server.
var err error
conn, err = getImageClientConnection(context)
if err != nil {
return fmt.Errorf("failed to connect: %v", err)
}
imageClient = pb.NewImageServiceClient(conn)
return nil
}
func closeConnection(context *cli.Context) error {
if conn == nil {
return nil
}
return conn.Close()
}