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cmd/dist, cmd/ctr: move image store access to GRPC

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With this changeset, image store access is now moved to completely
accessible over GRPC. No clients manipulate the image store database
directly and the GRPC client is fully featured. The metadata database is
now managed by the daemon and access coordinated via services.

Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day 2017-04-03 18:40:59 -07:00
parent 1ea809dc2a
commit 8c74da3983
No known key found for this signature in database
GPG key ID: 67B3DED84EDC823F
10 changed files with 69 additions and 98 deletions
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35
cmd/containerd/main.go
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@ -11,6 +11,7 @@ import (
"syscall"
"time"
"github.com/boltdb/bolt"
grpc_prometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
gocontext "golang.org/x/net/context"
"google.golang.org/grpc"
@ -19,8 +20,10 @@ import (
"github.com/containerd/containerd"
contentapi "github.com/containerd/containerd/api/services/content"
api "github.com/containerd/containerd/api/services/execution"
imagesapi "github.com/containerd/containerd/api/services/images"
rootfsapi "github.com/containerd/containerd/api/services/rootfs"
"github.com/containerd/containerd/content"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/plugin"
"github.com/containerd/containerd/reaper"
@ -115,11 +118,16 @@ func main() {
if err != nil {
return err
}
meta, err := resolveMetaDB(context)
if err != nil {
return err
}
defer meta.Close()
snapshotter, err := loadSnapshotter(store)
if err != nil {
return err
}
services, err := loadServices(runtimes, store, snapshotter)
services, err := loadServices(runtimes, store, snapshotter, meta)
if err != nil {
return err
}
@ -240,6 +248,22 @@ func resolveContentStore() (*content.Store, error) {
return content.NewStore(cp)
}
func resolveMetaDB(ctx *cli.Context) (*bolt.DB, error) {
path := filepath.Join(conf.Root, "meta.db")
db, err := bolt.Open(path, 0644, nil)
if err != nil {
return nil, err
}
// TODO(stevvooe): Break these down into components to be initialized.
if err := images.InitDB(db); err != nil {
return nil, err
}
return db, nil
}
func loadRuntimes(monitor plugin.ContainerMonitor) (map[string]containerd.Runtime, error) {
o := make(map[string]containerd.Runtime)
for name, rr := range plugin.Registrations() {
@ -306,7 +330,7 @@ func loadSnapshotter(store *content.Store) (snapshot.Snapshotter, error) {
ic := &plugin.InitContext{
Root: conf.Root,
State: conf.State,
Store: store,
Content: store,
Context: log.WithModule(global, moduleName),
}
if sr.Config != nil {
@ -333,7 +357,7 @@ func newGRPCServer() *grpc.Server {
return s
}
func loadServices(runtimes map[string]containerd.Runtime, store *content.Store, sn snapshot.Snapshotter) ([]plugin.Service, error) {
func loadServices(runtimes map[string]containerd.Runtime, store *content.Store, sn snapshot.Snapshotter, meta *bolt.DB) ([]plugin.Service, error) {
var o []plugin.Service
for name, sr := range plugin.Registrations() {
if sr.Type != plugin.GRPCPlugin {
@ -345,7 +369,8 @@ func loadServices(runtimes map[string]containerd.Runtime, store *content.Store,
State: conf.State,
Context: log.WithModule(global, fmt.Sprintf("service-%s", name)),
Runtimes: runtimes,
Store: store,
Content: store,
Meta: meta,
Snapshotter: sn,
}
if sr.Config != nil {
@ -397,6 +422,8 @@ func interceptor(ctx gocontext.Context,
ctx = log.WithModule(ctx, "content")
case rootfsapi.RootFSServer:
ctx = log.WithModule(ctx, "rootfs")
case imagesapi.ImagesServer:
ctx = log.WithModule(ctx, "images")
default:
fmt.Printf("unknown GRPC server type: %#v\n", info.Server)
}