forked from containerd/containerd
/
server.go
278 lines (257 loc) · 8.19 KB
/
server.go
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package server
import (
"expvar"
"net"
"net/http"
"net/http/pprof"
"os"
"path/filepath"
"strings"
"github.com/boltdb/bolt"
containers "github.com/containerd/containerd/api/services/containers/v1"
contentapi "github.com/containerd/containerd/api/services/content/v1"
diff "github.com/containerd/containerd/api/services/diff/v1"
eventsapi "github.com/containerd/containerd/api/services/events/v1"
images "github.com/containerd/containerd/api/services/images/v1"
introspection "github.com/containerd/containerd/api/services/introspection/v1"
leasesapi "github.com/containerd/containerd/api/services/leases/v1"
namespaces "github.com/containerd/containerd/api/services/namespaces/v1"
snapshotsapi "github.com/containerd/containerd/api/services/snapshots/v1"
tasks "github.com/containerd/containerd/api/services/tasks/v1"
version "github.com/containerd/containerd/api/services/version/v1"
"github.com/containerd/containerd/content"
"github.com/containerd/containerd/content/local"
"github.com/containerd/containerd/events/exchange"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/metadata"
"github.com/containerd/containerd/plugin"
"github.com/containerd/containerd/snapshots"
metrics "github.com/docker/go-metrics"
grpc_prometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
"github.com/pkg/errors"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/health/grpc_health_v1"
)
// New creates and initializes a new containerd server
func New(ctx context.Context, config *Config) (*Server, error) {
switch {
case config.Root == "":
return nil, errors.New("root must be specified")
case config.State == "":
return nil, errors.New("state must be specified")
case config.Root == config.State:
return nil, errors.New("root and state must be different paths")
}
if err := os.MkdirAll(config.Root, 0711); err != nil {
return nil, err
}
if err := os.MkdirAll(config.State, 0711); err != nil {
return nil, err
}
if err := apply(ctx, config); err != nil {
return nil, err
}
plugins, err := loadPlugins(config)
if err != nil {
return nil, err
}
rpc := grpc.NewServer(
grpc.UnaryInterceptor(interceptor),
grpc.StreamInterceptor(grpc_prometheus.StreamServerInterceptor),
)
var (
services []plugin.Service
s = &Server{
rpc: rpc,
events: exchange.NewExchange(),
}
initialized = plugin.NewPluginSet()
)
for _, p := range plugins {
id := p.URI()
log.G(ctx).WithField("type", p.Type).Infof("loading plugin %q...", id)
initContext := plugin.NewContext(
ctx,
p,
initialized,
config.Root,
config.State,
)
initContext.Events = s.events
initContext.Address = config.GRPC.Address
// load the plugin specific configuration if it is provided
if p.Config != nil {
pluginConfig, err := config.Decode(p.ID, p.Config)
if err != nil {
return nil, err
}
initContext.Config = pluginConfig
}
result := p.Init(initContext)
if err := initialized.Add(result); err != nil {
return nil, errors.Wrapf(err, "could not add plugin result to plugin set")
}
instance, err := result.Instance()
if err != nil {
if plugin.IsSkipPlugin(err) {
log.G(ctx).WithField("type", p.Type).Infof("skip loading plugin %q...", id)
} else {
log.G(ctx).WithError(err).Warnf("failed to load plugin %s", id)
}
continue
}
// check for grpc services that should be registered with the server
if service, ok := instance.(plugin.Service); ok {
services = append(services, service)
}
}
// register services after all plugins have been initialized
for _, service := range services {
if err := service.Register(rpc); err != nil {
return nil, err
}
}
return s, nil
}
// Server is the containerd main daemon
type Server struct {
rpc *grpc.Server
events *exchange.Exchange
}
// ServeGRPC provides the containerd grpc APIs on the provided listener
func (s *Server) ServeGRPC(l net.Listener) error {
// before we start serving the grpc API regster the grpc_prometheus metrics
// handler. This needs to be the last service registered so that it can collect
// metrics for every other service
grpc_prometheus.Register(s.rpc)
return trapClosedConnErr(s.rpc.Serve(l))
}
// ServeMetrics provides a prometheus endpoint for exposing metrics
func (s *Server) ServeMetrics(l net.Listener) error {
m := http.NewServeMux()
m.Handle("/v1/metrics", metrics.Handler())
return trapClosedConnErr(http.Serve(l, m))
}
// ServeDebug provides a debug endpoint
func (s *Server) ServeDebug(l net.Listener) error {
// don't use the default http server mux to make sure nothing gets registered
// that we don't want to expose via containerd
m := http.NewServeMux()
m.Handle("/debug/vars", expvar.Handler())
m.Handle("/debug/pprof/", http.HandlerFunc(pprof.Index))
m.Handle("/debug/pprof/cmdline", http.HandlerFunc(pprof.Cmdline))
m.Handle("/debug/pprof/profile", http.HandlerFunc(pprof.Profile))
m.Handle("/debug/pprof/symbol", http.HandlerFunc(pprof.Symbol))
m.Handle("/debug/pprof/trace", http.HandlerFunc(pprof.Trace))
return trapClosedConnErr(http.Serve(l, m))
}
// Stop the containerd server canceling any open connections
func (s *Server) Stop() {
s.rpc.Stop()
}
func loadPlugins(config *Config) ([]*plugin.Registration, error) {
// load all plugins into containerd
if err := plugin.Load(filepath.Join(config.Root, "plugins")); err != nil {
return nil, err
}
// load additional plugins that don't automatically register themselves
plugin.Register(&plugin.Registration{
Type: plugin.ContentPlugin,
ID: "content",
InitFn: func(ic *plugin.InitContext) (interface{}, error) {
ic.Meta.Exports["root"] = ic.Root
return local.NewStore(ic.Root)
},
})
plugin.Register(&plugin.Registration{
Type: plugin.MetadataPlugin,
ID: "bolt",
Requires: []plugin.Type{
plugin.ContentPlugin,
plugin.SnapshotPlugin,
},
InitFn: func(ic *plugin.InitContext) (interface{}, error) {
if err := os.MkdirAll(ic.Root, 0711); err != nil {
return nil, err
}
cs, err := ic.Get(plugin.ContentPlugin)
if err != nil {
return nil, err
}
snapshottersRaw, err := ic.GetByType(plugin.SnapshotPlugin)
if err != nil {
return nil, err
}
snapshotters := make(map[string]snapshots.Snapshotter)
for name, sn := range snapshottersRaw {
sn, err := sn.Instance()
if err != nil {
log.G(ic.Context).WithError(err).
Warnf("could not use snapshotter %v in metadata plugin", name)
continue
}
snapshotters[name] = sn.(snapshots.Snapshotter)
}
path := filepath.Join(ic.Root, "meta.db")
ic.Meta.Exports["path"] = path
db, err := bolt.Open(path, 0644, nil)
if err != nil {
return nil, err
}
mdb := metadata.NewDB(db, cs.(content.Store), snapshotters)
if err := mdb.Init(ic.Context); err != nil {
return nil, err
}
return mdb, nil
},
})
// return the ordered graph for plugins
return plugin.Graph(), nil
}
func interceptor(
ctx context.Context,
req interface{},
info *grpc.UnaryServerInfo,
handler grpc.UnaryHandler,
) (interface{}, error) {
ctx = log.WithModule(ctx, "containerd")
switch info.Server.(type) {
case tasks.TasksServer:
ctx = log.WithModule(ctx, "tasks")
case containers.ContainersServer:
ctx = log.WithModule(ctx, "containers")
case contentapi.ContentServer:
ctx = log.WithModule(ctx, "content")
case images.ImagesServer:
ctx = log.WithModule(ctx, "images")
case grpc_health_v1.HealthServer:
// No need to change the context
case version.VersionServer:
ctx = log.WithModule(ctx, "version")
case snapshotsapi.SnapshotsServer:
ctx = log.WithModule(ctx, "snapshot")
case diff.DiffServer:
ctx = log.WithModule(ctx, "diff")
case namespaces.NamespacesServer:
ctx = log.WithModule(ctx, "namespaces")
case eventsapi.EventsServer:
ctx = log.WithModule(ctx, "events")
case introspection.IntrospectionServer:
ctx = log.WithModule(ctx, "introspection")
case leasesapi.LeasesServer:
ctx = log.WithModule(ctx, "leases")
default:
log.G(ctx).Warnf("unknown GRPC server type: %#v\n", info.Server)
}
return grpc_prometheus.UnaryServerInterceptor(ctx, req, info, handler)
}
func trapClosedConnErr(err error) error {
if err == nil {
return nil
}
if strings.Contains(err.Error(), "use of closed network connection") {
return nil
}
return err
}