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/*
Copyright The containerd 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 plugincore
import (
"context"
"errors"
"fmt"
"net"
"os"
"path/filepath"
"time"
"github.com/containerd/containerd/defaults"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/pkg/dialer"
"github.com/containerd/containerd/platforms"
ctdplugin "github.com/containerd/containerd/plugin"
"github.com/containerd/stargz-snapshotter/service"
"github.com/containerd/stargz-snapshotter/service/keychain/cri"
"github.com/containerd/stargz-snapshotter/service/keychain/dockerconfig"
"github.com/containerd/stargz-snapshotter/service/keychain/kubeconfig"
"github.com/containerd/stargz-snapshotter/service/resolver"
grpc "google.golang.org/grpc"
"google.golang.org/grpc/backoff"
"google.golang.org/grpc/credentials/insecure"
runtime "k8s.io/cri-api/pkg/apis/runtime/v1"
)
// Config represents configuration for the stargz snapshotter plugin.
type Config struct {
service.Config
// RootPath is the directory for the plugin
RootPath string `toml:"root_path"`
// CRIKeychainImageServicePath is the path to expose CRI service wrapped by CRI keychain
CRIKeychainImageServicePath string `toml:"cri_keychain_image_service_path"`
// Registry is CRI-plugin-compatible registry configuration
Registry resolver.Registry `toml:"registry"`
}
func RegisterPlugin(registerCRIAlphaServer func(ctx context.Context, criAddr string, rpc *grpc.Server) resolver.Credential) {
ctdplugin.Register(&ctdplugin.Registration{
Type: ctdplugin.SnapshotPlugin,
ID: "stargz",
Config: &Config{},
InitFn: func(ic *ctdplugin.InitContext) (interface{}, error) {
ic.Meta.Platforms = append(ic.Meta.Platforms, platforms.DefaultSpec())
ctx := ic.Context
config, ok := ic.Config.(*Config)
if !ok {
return nil, errors.New("invalid stargz snapshotter configuration")
}
root := ic.Root
if config.RootPath != "" {
root = config.RootPath
}
ic.Meta.Exports["root"] = root
// Configure keychain
credsFuncs := []resolver.Credential{dockerconfig.NewDockerconfigKeychain(ctx)}
if config.Config.KubeconfigKeychainConfig.EnableKeychain {
var opts []kubeconfig.Option
if kcp := config.Config.KubeconfigKeychainConfig.KubeconfigPath; kcp != "" {
opts = append(opts, kubeconfig.WithKubeconfigPath(kcp))
}
credsFuncs = append(credsFuncs, kubeconfig.NewKubeconfigKeychain(ctx, opts...))
}
if addr := config.CRIKeychainImageServicePath; config.Config.CRIKeychainConfig.EnableKeychain && addr != "" {
// connects to the backend CRI service (defaults to containerd socket)
criAddr := ic.Address
if cp := config.Config.CRIKeychainConfig.ImageServicePath; cp != "" {
criAddr = cp
}
if criAddr == "" {
return nil, errors.New("backend CRI service address is not specified")
}
connectCRI := func() (runtime.ImageServiceClient, error) {
conn, err := newCRIConn(criAddr)
if err != nil {
return nil, err
}
return runtime.NewImageServiceClient(conn), nil
}
criCreds, criServer := cri.NewCRIKeychain(ctx, connectCRI)
// Create a gRPC server
rpc := grpc.NewServer()
runtime.RegisterImageServiceServer(rpc, criServer)
criAlphaCreds := registerCRIAlphaServer(ctx, criAddr, rpc)
// Prepare the directory for the socket
if err := os.MkdirAll(filepath.Dir(addr), 0700); err != nil {
return nil, fmt.Errorf("failed to create directory %q: %w", filepath.Dir(addr), err)
}
// Try to remove the socket file to avoid EADDRINUSE
if err := os.RemoveAll(addr); err != nil {
return nil, fmt.Errorf("failed to remove %q: %w", addr, err)
}
// Listen and serve
l, err := net.Listen("unix", addr)
if err != nil {
return nil, fmt.Errorf("error on listen socket %q: %w", addr, err)
}
go func() {
if err := rpc.Serve(l); err != nil {
log.G(ctx).WithError(err).Warnf("error on serving via socket %q", addr)
}
}()
credsFuncs = append(credsFuncs, criAlphaCreds, criCreds)
}
// TODO(ktock): print warn if old configuration is specified.
// TODO(ktock): should we respect old configuration?
return service.NewStargzSnapshotterService(ctx, root, &config.Config,
service.WithCustomRegistryHosts(resolver.RegistryHostsFromCRIConfig(ctx, config.Registry, credsFuncs...)))
},
})
}
func newCRIConn(criAddr string) (*grpc.ClientConn, error) {
// TODO: make gRPC options configurable from config.toml
backoffConfig := backoff.DefaultConfig
backoffConfig.MaxDelay = 3 * time.Second
connParams := grpc.ConnectParams{
Backoff: backoffConfig,
}
gopts := []grpc.DialOption{
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithConnectParams(connParams),
grpc.WithContextDialer(dialer.ContextDialer),
grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(defaults.DefaultMaxRecvMsgSize)),
grpc.WithDefaultCallOptions(grpc.MaxCallSendMsgSize(defaults.DefaultMaxSendMsgSize)),
}
return grpc.Dial(dialer.DialAddress(criAddr), gopts...)
}
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