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server.go
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server.go
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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 server
import (
"context"
"expvar"
"io"
"net"
"net/http"
"net/http/pprof"
"os"
"path/filepath"
"strings"
"sync"
"time"
csapi "github.com/containerd/containerd/api/services/content/v1"
ssapi "github.com/containerd/containerd/api/services/snapshots/v1"
"github.com/containerd/containerd/content"
"github.com/containerd/containerd/content/local"
csproxy "github.com/containerd/containerd/content/proxy"
"github.com/containerd/containerd/defaults"
"github.com/containerd/containerd/diff"
"github.com/containerd/containerd/events/exchange"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/metadata"
"github.com/containerd/containerd/pkg/dialer"
"github.com/containerd/containerd/pkg/timeout"
"github.com/containerd/containerd/plugin"
srvconfig "github.com/containerd/containerd/services/server/config"
"github.com/containerd/containerd/snapshots"
ssproxy "github.com/containerd/containerd/snapshots/proxy"
"github.com/containerd/containerd/sys"
"github.com/containerd/ttrpc"
metrics "github.com/docker/go-metrics"
grpc_prometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
"github.com/pkg/errors"
bolt "go.etcd.io/bbolt"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
// CreateTopLevelDirectories creates the top-level root and state directories.
func CreateTopLevelDirectories(config *srvconfig.Config) error {
switch {
case config.Root == "":
return errors.New("root must be specified")
case config.State == "":
return errors.New("state must be specified")
case config.Root == config.State:
return errors.New("root and state must be different paths")
}
if err := sys.MkdirAllWithACL(config.Root, 0711); err != nil {
return err
}
return sys.MkdirAllWithACL(config.State, 0711)
}
// New creates and initializes a new containerd server
func New(ctx context.Context, config *srvconfig.Config) (*Server, error) {
if err := apply(ctx, config); err != nil {
return nil, err
}
for key, sec := range config.Timeouts {
d, err := time.ParseDuration(sec)
if err != nil {
return nil, errors.Errorf("unable to parse %s into a time duration", sec)
}
timeout.Set(key, d)
}
plugins, err := LoadPlugins(ctx, config)
if err != nil {
return nil, err
}
for id, p := range config.StreamProcessors {
diff.RegisterProcessor(diff.BinaryHandler(id, p.Returns, p.Accepts, p.Path, p.Args))
}
serverOpts := []grpc.ServerOption{
grpc.UnaryInterceptor(grpc_prometheus.UnaryServerInterceptor),
grpc.StreamInterceptor(grpc_prometheus.StreamServerInterceptor),
}
if config.GRPC.MaxRecvMsgSize > 0 {
serverOpts = append(serverOpts, grpc.MaxRecvMsgSize(config.GRPC.MaxRecvMsgSize))
}
if config.GRPC.MaxSendMsgSize > 0 {
serverOpts = append(serverOpts, grpc.MaxSendMsgSize(config.GRPC.MaxSendMsgSize))
}
ttrpcServer, err := newTTRPCServer()
if err != nil {
return nil, err
}
tcpServerOpts := serverOpts
if config.GRPC.TCPTLSCert != "" {
log.G(ctx).Info("setting up tls on tcp GRPC services...")
creds, err := credentials.NewServerTLSFromFile(config.GRPC.TCPTLSCert, config.GRPC.TCPTLSKey)
if err != nil {
return nil, err
}
tcpServerOpts = append(tcpServerOpts, grpc.Creds(creds))
}
var (
grpcServer = grpc.NewServer(serverOpts...)
tcpServer = grpc.NewServer(tcpServerOpts...)
grpcServices []plugin.Service
tcpServices []plugin.TCPService
ttrpcServices []plugin.TTRPCService
s = &Server{
grpcServer: grpcServer,
tcpServer: tcpServer,
ttrpcServer: ttrpcServer,
events: exchange.NewExchange(),
config: config,
}
initialized = plugin.NewPluginSet()
required = make(map[string]struct{})
)
for _, r := range config.RequiredPlugins {
required[r] = struct{}{}
}
for _, p := range plugins {
id := p.URI()
reqID := id
if config.GetVersion() == 1 {
reqID = p.ID
}
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
initContext.TTRPCAddress = config.TTRPC.Address
// load the plugin specific configuration if it is provided
if p.Config != nil {
pc, err := config.Decode(p)
if err != nil {
return nil, err
}
initContext.Config = pc
}
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).WithError(err).WithField("type", p.Type).Infof("skip loading plugin %q...", id)
} else {
log.G(ctx).WithError(err).Warnf("failed to load plugin %s", id)
}
if _, ok := required[reqID]; ok {
return nil, errors.Wrapf(err, "load required plugin %s", id)
}
continue
}
delete(required, reqID)
// check for grpc services that should be registered with the server
if src, ok := instance.(plugin.Service); ok {
grpcServices = append(grpcServices, src)
}
if src, ok := instance.(plugin.TTRPCService); ok {
ttrpcServices = append(ttrpcServices, src)
}
if service, ok := instance.(plugin.TCPService); ok {
tcpServices = append(tcpServices, service)
}
s.plugins = append(s.plugins, result)
}
if len(required) != 0 {
var missing []string
for id := range required {
missing = append(missing, id)
}
return nil, errors.Errorf("required plugin %s not included", missing)
}
// register services after all plugins have been initialized
for _, service := range grpcServices {
if err := service.Register(grpcServer); err != nil {
return nil, err
}
}
for _, service := range ttrpcServices {
if err := service.RegisterTTRPC(ttrpcServer); err != nil {
return nil, err
}
}
for _, service := range tcpServices {
if err := service.RegisterTCP(tcpServer); err != nil {
return nil, err
}
}
return s, nil
}
// Server is the containerd main daemon
type Server struct {
grpcServer *grpc.Server
ttrpcServer *ttrpc.Server
tcpServer *grpc.Server
events *exchange.Exchange
config *srvconfig.Config
plugins []*plugin.Plugin
}
// ServeGRPC provides the containerd grpc APIs on the provided listener
func (s *Server) ServeGRPC(l net.Listener) error {
if s.config.Metrics.GRPCHistogram {
// enable grpc time histograms to measure rpc latencies
grpc_prometheus.EnableHandlingTimeHistogram()
}
// before we start serving the grpc API register 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.grpcServer)
return trapClosedConnErr(s.grpcServer.Serve(l))
}
// ServeTTRPC provides the containerd ttrpc APIs on the provided listener
func (s *Server) ServeTTRPC(l net.Listener) error {
return trapClosedConnErr(s.ttrpcServer.Serve(context.Background(), 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))
}
// ServeTCP allows services to serve over tcp
func (s *Server) ServeTCP(l net.Listener) error {
grpc_prometheus.Register(s.tcpServer)
return trapClosedConnErr(s.tcpServer.Serve(l))
}
// 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.grpcServer.Stop()
for i := len(s.plugins) - 1; i >= 0; i-- {
p := s.plugins[i]
instance, err := p.Instance()
if err != nil {
log.L.WithError(err).WithField("id", p.Registration.URI()).
Errorf("could not get plugin instance")
continue
}
closer, ok := instance.(io.Closer)
if !ok {
continue
}
if err := closer.Close(); err != nil {
log.L.WithError(err).WithField("id", p.Registration.URI()).
Errorf("failed to close plugin")
}
}
}
// LoadPlugins loads all plugins into containerd and generates an ordered graph
// of all plugins.
func LoadPlugins(ctx context.Context, config *srvconfig.Config) ([]*plugin.Registration, error) {
// load all plugins into containerd
path := config.PluginDir
if path == "" {
path = filepath.Join(config.Root, "plugins")
}
if err := plugin.Load(path); 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,
},
Config: &srvconfig.BoltConfig{
ContentSharingPolicy: srvconfig.SharingPolicyShared,
},
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 {
if !plugin.IsSkipPlugin(err) {
log.G(ic.Context).WithError(err).
Warnf("could not use snapshotter %v in metadata plugin", name)
}
continue
}
snapshotters[name] = sn.(snapshots.Snapshotter)
}
shared := true
ic.Meta.Exports["policy"] = srvconfig.SharingPolicyShared
if cfg, ok := ic.Config.(*srvconfig.BoltConfig); ok {
if cfg.ContentSharingPolicy != "" {
if err := cfg.Validate(); err != nil {
return nil, err
}
if cfg.ContentSharingPolicy == srvconfig.SharingPolicyIsolated {
ic.Meta.Exports["policy"] = srvconfig.SharingPolicyIsolated
shared = false
}
log.L.WithField("policy", cfg.ContentSharingPolicy).Info("metadata content store policy set")
}
}
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
}
var dbopts []metadata.DBOpt
if !shared {
dbopts = append(dbopts, metadata.WithPolicyIsolated)
}
mdb := metadata.NewDB(db, cs.(content.Store), snapshotters, dbopts...)
if err := mdb.Init(ic.Context); err != nil {
return nil, err
}
return mdb, nil
},
})
clients := &proxyClients{}
for name, pp := range config.ProxyPlugins {
var (
t plugin.Type
f func(*grpc.ClientConn) interface{}
address = pp.Address
)
switch pp.Type {
case string(plugin.SnapshotPlugin), "snapshot":
t = plugin.SnapshotPlugin
ssname := name
f = func(conn *grpc.ClientConn) interface{} {
return ssproxy.NewSnapshotter(ssapi.NewSnapshotsClient(conn), ssname)
}
case string(plugin.ContentPlugin), "content":
t = plugin.ContentPlugin
f = func(conn *grpc.ClientConn) interface{} {
return csproxy.NewContentStore(csapi.NewContentClient(conn))
}
default:
log.G(ctx).WithField("type", pp.Type).Warn("unknown proxy plugin type")
}
plugin.Register(&plugin.Registration{
Type: t,
ID: name,
InitFn: func(ic *plugin.InitContext) (interface{}, error) {
ic.Meta.Exports["address"] = address
conn, err := clients.getClient(address)
if err != nil {
return nil, err
}
return f(conn), nil
},
})
}
filter := srvconfig.V2DisabledFilter
if config.GetVersion() == 1 {
filter = srvconfig.V1DisabledFilter
}
// return the ordered graph for plugins
return plugin.Graph(filter(config.DisabledPlugins)), nil
}
type proxyClients struct {
m sync.Mutex
clients map[string]*grpc.ClientConn
}
func (pc *proxyClients) getClient(address string) (*grpc.ClientConn, error) {
pc.m.Lock()
defer pc.m.Unlock()
if pc.clients == nil {
pc.clients = map[string]*grpc.ClientConn{}
} else if c, ok := pc.clients[address]; ok {
return c, nil
}
gopts := []grpc.DialOption{
grpc.WithInsecure(),
grpc.WithBackoffMaxDelay(3 * time.Second),
grpc.WithContextDialer(dialer.ContextDialer),
// TODO(stevvooe): We may need to allow configuration of this on the client.
grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(defaults.DefaultMaxRecvMsgSize)),
grpc.WithDefaultCallOptions(grpc.MaxCallSendMsgSize(defaults.DefaultMaxSendMsgSize)),
}
conn, err := grpc.Dial(dialer.DialAddress(address), gopts...)
if err != nil {
return nil, errors.Wrapf(err, "failed to dial %q", address)
}
pc.clients[address] = conn
return conn, nil
}
func trapClosedConnErr(err error) error {
if err == nil {
return nil
}
if strings.Contains(err.Error(), "use of closed network connection") {
return nil
}
return err
}