*: add CRI-O handler

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

container/container.go

@@ -34,6 +34,7 @@ const (
 	ContainerTypeDocker
 	ContainerTypeRkt
 	ContainerTypeSystemd
+	ContainerTypeCrio
 )
 
 // Interface for container operation handlers.

container/crio/client.go

@@ -0,0 +1,130 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// 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 crio
+
+import (
+	"encoding/json"
+	"fmt"
+	"net"
+	"net/http"
+	"syscall"
+	"time"
+)
+
+const (
+	CrioSocket            = "/var/run/crio.sock"
+	maxUnixSocketPathSize = len(syscall.RawSockaddrUnix{}.Path)
+)
+
+// Info represents CRI-O information as sent by the CRI-O server
+type Info struct {
+	StorageDriver string `json:"storage_driver"`
+	StorageRoot   string `json:"storage_root"`
+}
+
+// ContainerInfo represents a given container information
+type ContainerInfo struct {
+	Name        string            `json:"name"`
+	Pid         int               `json:"pid"`
+	Image       string            `json:"image"`
+	CreatedTime int64             `json:"created_time"`
+	Labels      map[string]string `json:"labels"`
+	Annotations map[string]string `json:"annotations"`
+	LogPath     string            `json:"log_path"`
+	Root        string            `json:"root"`
+	IP          string            `json:"ip_address"`
+}
+
+type crioClient interface {
+	Info() (Info, error)
+	ContainerInfo(string) (*ContainerInfo, error)
+}
+
+type crioClientImpl struct {
+	client *http.Client
+}
+
+func configureUnixTransport(tr *http.Transport, proto, addr string) error {
+	if len(addr) > maxUnixSocketPathSize {
+		return fmt.Errorf("Unix socket path %q is too long", addr)
+	}
+	// No need for compression in local communications.
+	tr.DisableCompression = true
+	tr.Dial = func(_, _ string) (net.Conn, error) {
+		return net.DialTimeout(proto, addr, 32*time.Second)
+	}
+	return nil
+}
+
+// Client returns a new configured CRI-O client
+func Client() (crioClient, error) {
+	tr := new(http.Transport)
+	configureUnixTransport(tr, "unix", CrioSocket)
+	c := &http.Client{
+		Transport: tr,
+	}
+	return &crioClientImpl{
+		client: c,
+	}, nil
+}
+
+func getRequest(path string) (*http.Request, error) {
+	req, err := http.NewRequest("GET", path, nil)
+	if err != nil {
+		return nil, err
+	}
+	// For local communications over a unix socket, it doesn't matter what
+	// the host is. We just need a valid and meaningful host name.
+	req.Host = "crio"
+	req.URL.Host = CrioSocket
+	req.URL.Scheme = "http"
+	return req, nil
+}
+
+// Info returns generic info from the CRI-O server
+func (c *crioClientImpl) Info() (Info, error) {
+	info := Info{}
+	req, err := getRequest("/info")
+	if err != nil {
+		return info, err
+	}
+	resp, err := c.client.Do(req)
+	if err != nil {
+		return info, err
+	}
+	defer resp.Body.Close()
+	if err := json.NewDecoder(resp.Body).Decode(&info); err != nil {
+		return info, err
+	}
+	return info, nil
+}
+
+// ContainerInfo returns information about a given container
+func (c *crioClientImpl) ContainerInfo(id string) (*ContainerInfo, error) {
+	req, err := getRequest("/containers/" + id)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := c.client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	cInfo := ContainerInfo{}
+	if err := json.NewDecoder(resp.Body).Decode(&cInfo); err != nil {
+		return nil, err
+	}
+	return &cInfo, nil
+}

container/crio/client_test.go

@@ -0,0 +1,49 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// 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 crio
+
+import "fmt"
+
+type crioClientMock struct {
+	info           Info
+	containersInfo map[string]*ContainerInfo
+	err            error
+}
+
+func (c *crioClientMock) Info() (Info, error) {
+	if c.err != nil {
+		return Info{}, c.err
+	}
+	return c.info, nil
+}
+
+func (c *crioClientMock) ContainerInfo(id string) (*ContainerInfo, error) {
+	if c.err != nil {
+		return nil, c.err
+	}
+	cInfo, ok := c.containersInfo[id]
+	if !ok {
+		return nil, fmt.Errorf("no container with id %s", id)
+	}
+	return cInfo, nil
+}
+
+func mockCrioClient(info Info, containersInfo map[string]*ContainerInfo, err error) crioClient {
+	return &crioClientMock{
+		err:            err,
+		info:           info,
+		containersInfo: containersInfo,
+	}
+}

container/crio/factory.go

@@ -0,0 +1,170 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// 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 crio
+
+import (
+	"fmt"
+	"path"
+	"regexp"
+	"strings"
+
+	"github.com/google/cadvisor/container"
+	"github.com/google/cadvisor/container/libcontainer"
+	"github.com/google/cadvisor/fs"
+	info "github.com/google/cadvisor/info/v1"
+	"github.com/google/cadvisor/manager/watcher"
+
+	"github.com/golang/glog"
+)
+
+// The namespace under which crio aliases are unique.
+const CrioNamespace = "crio"
+
+// Regexp that identifies CRI-O cgroups
+var crioCgroupRegexp = regexp.MustCompile(`([a-z0-9]{64})`)
+
+type storageDriver string
+
+const (
+	// TODO add full set of supported drivers in future..
+	overlayStorageDriver  storageDriver = "overlay"
+	overlay2StorageDriver storageDriver = "overlay2"
+)
+
+type crioFactory struct {
+	machineInfoFactory info.MachineInfoFactory
+
+	storageDriver storageDriver
+	storageDir    string
+
+	// Information about the mounted cgroup subsystems.
+	cgroupSubsystems libcontainer.CgroupSubsystems
+
+	// Information about mounted filesystems.
+	fsInfo fs.FsInfo
+
+	ignoreMetrics container.MetricSet
+
+	client crioClient
+}
+
+func (self *crioFactory) String() string {
+	return CrioNamespace
+}
+
+func (self *crioFactory) NewContainerHandler(name string, inHostNamespace bool) (handler container.ContainerHandler, err error) {
+	client, err := Client()
+	if err != nil {
+		return
+	}
+	// TODO are there any env vars we need to white list, if so, do it here...
+	metadataEnvs := []string{}
+	handler, err = newCrioContainerHandler(
+		client,
+		name,
+		self.machineInfoFactory,
+		self.fsInfo,
+		self.storageDriver,
+		self.storageDir,
+		&self.cgroupSubsystems,
+		inHostNamespace,
+		metadataEnvs,
+		self.ignoreMetrics,
+	)
+	return
+}
+
+// Returns the CRIO ID from the full container name.
+func ContainerNameToCrioId(name string) string {
+	id := path.Base(name)
+
+	if matches := crioCgroupRegexp.FindStringSubmatch(id); matches != nil {
+		return matches[1]
+	}
+
+	return id
+}
+
+// isContainerName returns true if the cgroup with associated name
+// corresponds to a crio container.
+func isContainerName(name string) bool {
+	// always ignore .mount cgroup even if associated with crio and delegate to systemd
+	if strings.HasSuffix(name, ".mount") {
+		return false
+	}
+	return crioCgroupRegexp.MatchString(path.Base(name))
+}
+
+// crio handles all containers under /crio
+func (self *crioFactory) CanHandleAndAccept(name string) (bool, bool, error) {
+	if strings.HasPrefix(path.Base(name), "crio-conmon") {
+		// TODO(runcom): should we include crio-conmon cgroups?
+		return false, false, nil
+	}
+	if !strings.HasPrefix(path.Base(name), CrioNamespace) {
+		return false, false, nil
+	}
+	// if the container is not associated with CRI-O, we can't handle it or accept it.
+	if !isContainerName(name) {
+		return false, false, nil
+	}
+	return true, true, nil
+}
+
+func (self *crioFactory) DebugInfo() map[string][]string {
+	return map[string][]string{}
+}
+
+var (
+	// TODO(runcom): handle versioning in CRI-O
+	version_regexp_string    = `(\d+)\.(\d+)\.(\d+)`
+	version_re               = regexp.MustCompile(version_regexp_string)
+	apiversion_regexp_string = `(\d+)\.(\d+)`
+	apiversion_re            = regexp.MustCompile(apiversion_regexp_string)
+)
+
+// Register root container before running this function!
+func Register(factory info.MachineInfoFactory, fsInfo fs.FsInfo, ignoreMetrics container.MetricSet) error {
+	client, err := Client()
+	if err != nil {
+		return err
+	}
+
+	info, err := client.Info()
+	if err != nil {
+		return err
+	}
+
+	// TODO determine crio version so we can work differently w/ future versions if needed
+
+	cgroupSubsystems, err := libcontainer.GetCgroupSubsystems()
+	if err != nil {
+		return fmt.Errorf("failed to get cgroup subsystems: %v", err)
+	}
+
+	glog.Infof("Registering CRI-O factory")
+	f := &crioFactory{
+		client:             client,
+		cgroupSubsystems:   cgroupSubsystems,
+		fsInfo:             fsInfo,
+		machineInfoFactory: factory,
+		storageDriver:      storageDriver(info.StorageDriver),
+		storageDir:         info.StorageRoot,
+		ignoreMetrics:      ignoreMetrics,
+	}
+
+	container.RegisterContainerHandlerFactory(f, []watcher.ContainerWatchSource{watcher.Raw})
+	return nil
+}