/
main.go
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/
main.go
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/*
* Copyright (c) 2023. Nydus Developers. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
package main
import (
"context"
"fmt"
"io"
"log/syslog"
"net"
"net/http"
"os"
"path/filepath"
"strings"
"github.com/containerd/nri/pkg/api"
"github.com/containerd/nri/pkg/stub"
"github.com/pelletier/go-toml"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/urfave/cli/v2"
"github.com/containerd/nydus-snapshotter/pkg/errdefs"
"github.com/containerd/nydus-snapshotter/version"
)
const (
endpointPrefetch = "/api/v1/prefetch"
defaultEvents = "RunPodSandbox"
defaultSystemControllerAddress = "/run/containerd-nydus/system.sock"
defaultPrefetchConfigDir = "/etc/nydus"
nydusPrefetchAnnotation = "containerd.io/nydus-prefetch"
)
type PluginArgs struct {
PluginName string
PluginIdx string
SocketAddress string
}
type Flags struct {
Args *PluginArgs
Flag []cli.Flag
}
func buildFlags(args *PluginArgs) []cli.Flag {
return []cli.Flag{
&cli.StringFlag{
Name: "name",
Usage: "plugin name to register to NRI",
Destination: &args.PluginName,
},
&cli.StringFlag{
Name: "idx",
Usage: "plugin index to register to NRI",
Destination: &args.PluginIdx,
},
&cli.StringFlag{
Name: "socket-addr",
Value: defaultSystemControllerAddress,
Usage: "unix domain socket address. If defined in the configuration file, there is no need to add ",
Destination: &args.SocketAddress,
},
}
}
func NewPluginFlags() *Flags {
var args PluginArgs
return &Flags{
Args: &args,
Flag: buildFlags(&args),
}
}
type plugin struct {
stub stub.Stub
mask stub.EventMask
}
var (
globalSocket string
log *logrus.Logger
logWriter *syslog.Writer
)
// sendDataOverHTTP sends the prefetch data to the specified endpoint over HTTP using a Unix socket.
func sendDataOverHTTP(data string, endpoint, sock string) error {
url := fmt.Sprintf("http://unix%s", endpoint)
req, err := http.NewRequest(http.MethodPut, url, strings.NewReader(data))
if err != nil {
return err
}
client := &http.Client{
Transport: &http.Transport{
DialContext: func(_ context.Context, _, _ string) (net.Conn, error) {
return net.Dial("unix", sock)
},
},
}
resp, err := client.Do(req)
if err != nil {
return err
}
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("failed to send data, status code: %d", resp.StatusCode)
}
resp.Body.Close()
return nil
}
func (p *plugin) RunPodSandbox(pod *api.PodSandbox) error {
prefetchList, ok := pod.Annotations[nydusPrefetchAnnotation]
if !ok {
return nil
}
err := sendDataOverHTTP(prefetchList, endpointPrefetch, globalSocket)
if err != nil {
log.Errorf("failed to send data: %v", err)
return err
}
return nil
}
func main() {
flags := NewPluginFlags()
app := &cli.App{
Name: "prefetch-nri-plugin",
Usage: "NRI plugin for obtaining and transmitting prefetch files path",
Version: version.Version,
Flags: flags.Flag,
HideVersion: true,
Action: func(_ *cli.Context) error {
var (
opts []stub.Option
err error
)
log = logrus.StandardLogger()
configFileName := "prefetchConfig.toml"
configDir := defaultPrefetchConfigDir
configFilePath := filepath.Join(configDir, configFileName)
config, err := toml.LoadFile(configFilePath)
if err != nil {
log.Warnf("failed to read config file: %v", err)
}
configSocketAddrRaw := config.Get("file_prefetch.socket_address")
if configSocketAddrRaw != nil {
if configSocketAddr, ok := configSocketAddrRaw.(string); ok {
globalSocket = configSocketAddr
} else {
log.Warnf("failed to read config: 'file_prefetch.socket_address' is not a string")
}
} else {
globalSocket = flags.Args.SocketAddress
}
log.SetFormatter(&logrus.TextFormatter{
PadLevelText: true,
})
logWriter, err = syslog.New(syslog.LOG_INFO, "prefetch-nri-plugin")
if err == nil {
log.SetOutput(io.MultiWriter(os.Stdout, logWriter))
}
if flags.Args.PluginName != "" {
opts = append(opts, stub.WithPluginName(flags.Args.PluginName))
}
if flags.Args.PluginIdx != "" {
opts = append(opts, stub.WithPluginIdx(flags.Args.PluginIdx))
}
p := &plugin{}
if p.mask, err = api.ParseEventMask(defaultEvents); err != nil {
log.Fatalf("failed to parse events: %v", err)
}
if p.stub, err = stub.New(p, opts...); err != nil {
log.Fatalf("failed to create plugin stub: %v", err)
}
err = p.stub.Run(context.Background())
if err != nil {
return errors.Wrap(err, "plugin exited")
}
return nil
},
}
if err := app.Run(os.Args); err != nil {
if errdefs.IsConnectionClosed(err) {
log.Info("prefetch NRI plugin exited")
} else {
log.WithError(err).Fatal("failed to start prefetch NRI plugin")
}
}
}