add a client to get container info from kubelet

pkg/client/containerinfo.go

+/*
+Copyright 2014 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 client
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"strconv"
+
+	"github.com/google/cadvisor/info"
+)
+
+type ContainerInfoGetter interface {
+	GetContainerInfo(host, podID, containerID string, req *info.ContainerInfoRequest) (*info.ContainerInfo, error)
+	GetMachineInfo(host string, req *info.ContainerInfoRequest) (*info.ContainerInfo, error)
+}
+
+type HTTPContainerInfoGetter struct {
+	Client *http.Client
+	Port   int
+}
+
+func (self *HTTPContainerInfoGetter) getContainerInfo(host, path string, req *info.ContainerInfoRequest) (*info.ContainerInfo, error) {
+	var body io.Reader
+	if req != nil {
+		content, err := json.Marshal(req)
+		if err != nil {
+			return nil, err
+		}
+		body = bytes.NewBuffer(content)
+	}
+
+	request, err := http.NewRequest(
+		"GET",
+		fmt.Sprintf("http://%v/stats/%v",
+			net.JoinHostPort(host, strconv.Itoa(self.Port)),
+			path,
+		),
+		body,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	response, err := self.Client.Do(request)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("trying to get info for %v from %v; received status %v",
+			path, host, response.Status)
+	}
+	decoder := json.NewDecoder(response.Body)
+	var cinfo info.ContainerInfo
+	err = decoder.Decode(&cinfo)
+	if err != nil {
+		return nil, err
+	}
+	return &cinfo, nil
+}
+
+func (self *HTTPContainerInfoGetter) GetContainerInfo(host, podID, containerID string, req *info.ContainerInfoRequest) (*info.ContainerInfo, error) {
+	return self.getContainerInfo(
+		host,
+		fmt.Sprintf("%v/%v", podID, containerID),
+		req,
+	)
+}
+
+func (self *HTTPContainerInfoGetter) GetMachineInfo(host string, req *info.ContainerInfoRequest) (*info.ContainerInfo, error) {
+	return self.getContainerInfo(host, "", req)
+}

pkg/client/containerinfo_test.go

+/*
+Copyright 2014 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 client
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"path"
+	"reflect"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/google/cadvisor/info"
+	itest "github.com/google/cadvisor/info/test"
+)
+
+func testHTTPContainerInfoGetter(
+	req *info.ContainerInfoRequest,
+	cinfo *info.ContainerInfo,
+	podID string,
+	containerID string,
+	status int,
+	t *testing.T,
+) {
+	expectedPath := "/stats"
+	if len(podID) > 0 && len(containerID) > 0 {
+		expectedPath = path.Join(expectedPath, podID, containerID)
+	}
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if status != 0 {
+			w.WriteHeader(status)
+		}
+		if strings.TrimRight(r.URL.Path, "/") != strings.TrimRight(expectedPath, "/") {
+			t.Fatalf("Received request to an invalid path. Should be %v. got %v",
+				expectedPath, r.URL.Path)
+		}
+
+		decoder := json.NewDecoder(r.Body)
+		var receivedReq info.ContainerInfoRequest
+		err := decoder.Decode(&receivedReq)
+		if err != nil {
+			t.Fatal(err)
+		}
+		// Note: This will not make a deep copy of req.
+		// So changing req after Get*Info would be a race.
+		expectedReq := req
+		// Fill any empty fields with default value
+		expectedReq = expectedReq.FillDefaults()
+		if !reflect.DeepEqual(expectedReq, &receivedReq) {
+			t.Errorf("received wrong request")
+		}
+		encoder := json.NewEncoder(w)
+		err = encoder.Encode(cinfo)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}))
+	hostURL, err := url.Parse(ts.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	parts := strings.Split(hostURL.Host, ":")
+
+	port, err := strconv.Atoi(parts[1])
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	containerInfoGetter := &HTTPContainerInfoGetter{
+		Client: http.DefaultClient,
+		Port:   port,
+	}
+
+	var receivedContainerInfo *info.ContainerInfo
+	if len(podID) > 0 && len(containerID) > 0 {
+		receivedContainerInfo, err = containerInfoGetter.GetContainerInfo(parts[0], podID, containerID, req)
+	} else {
+		receivedContainerInfo, err = containerInfoGetter.GetMachineInfo(parts[0], req)
+	}
+	if status == 0 || status == http.StatusOK {
+		if err != nil {
+			t.Errorf("received unexpected error: %v", err)
+		}
+
+		if !receivedContainerInfo.Eq(cinfo) {
+			t.Error("received unexpected container info")
+		}
+	} else {
+		if err == nil {
+			t.Error("did not receive expected error.")
+		}
+	}
+}
+
+func TestHTTPContainerInfoGetterGetContainerInfoSuccessfully(t *testing.T) {
+	req := &info.ContainerInfoRequest{
+		NumStats:   10,
+		NumSamples: 10,
+	}
+	req = req.FillDefaults()
+	cinfo := itest.GenerateRandomContainerInfo(
+		"dockerIDWhichWillNotBeChecked", // docker ID
+		2, // Number of cores
+		req,
+		1*time.Second,
+	)
+	testHTTPContainerInfoGetter(req, cinfo, "somePodID", "containerNameInK8S", 0, t)
+}
+
+func TestHTTPContainerInfoGetterGetMachineInfoSuccessfully(t *testing.T) {
+	req := &info.ContainerInfoRequest{
+		NumStats:   10,
+		NumSamples: 10,
+	}
+	req = req.FillDefaults()
+	cinfo := itest.GenerateRandomContainerInfo(
+		"dockerIDWhichWillNotBeChecked", // docker ID
+		2, // Number of cores
+		req,
+		1*time.Second,
+	)
+	testHTTPContainerInfoGetter(req, cinfo, "", "", 0, t)
+}
+
+func TestHTTPContainerInfoGetterGetContainerInfoWithError(t *testing.T) {
+	req := &info.ContainerInfoRequest{
+		NumStats:   10,
+		NumSamples: 10,
+	}
+	req = req.FillDefaults()
+	cinfo := itest.GenerateRandomContainerInfo(
+		"dockerIDWhichWillNotBeChecked", // docker ID
+		2, // Number of cores
+		req,
+		1*time.Second,
+	)
+	testHTTPContainerInfoGetter(req, cinfo, "somePodID", "containerNameInK8S", http.StatusNotFound, t)
+}
+
+func TestHTTPContainerInfoGetterGetMachineInfoWithError(t *testing.T) {
+	req := &info.ContainerInfoRequest{
+		NumStats:   10,
+		NumSamples: 10,
+	}
+	req = req.FillDefaults()
+	cinfo := itest.GenerateRandomContainerInfo(
+		"dockerIDWhichWillNotBeChecked", // docker ID
+		2, // Number of cores
+		req,
+		1*time.Second,
+	)
+	testHTTPContainerInfoGetter(req, cinfo, "", "", http.StatusNotFound, t)
+}

third_party/src/github.com/google/cadvisor/CHANGELOG.md

 # Changelog
 
+## 0.1.3 (2014-07-14)
+- Add support for systemd systems.
+- Fixes for UI with InfluxDB storage driver.
+
 ## 0.1.2 (2014-07-10)
 - Added Storage Driver concept (flag: storage_driver), default is the in-memory driver
 - Implemented InfluxDB storage driver

third_party/src/github.com/google/cadvisor/client/client_test.go

@@ -110,32 +110,7 @@ func TestGetContainerInfo(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	// We cannot use DeepEqual() to compare them directly,
-	// because json en/decoded time may have precision issues.
-	if !reflect.DeepEqual(returned.ContainerReference, cinfo.ContainerReference) {
-		t.Errorf("received unexpected container ref")
-	}
-	if !reflect.DeepEqual(returned.Subcontainers, cinfo.Subcontainers) {
-		t.Errorf("received unexpected subcontainers")
-	}
-	if !reflect.DeepEqual(returned.Spec, cinfo.Spec) {
-		t.Errorf("received unexpected spec")
-	}
-	if !reflect.DeepEqual(returned.StatsPercentiles, cinfo.StatsPercentiles) {
-		t.Errorf("received unexpected spec")
-	}
-
-	for i, expectedStats := range cinfo.Stats {
-		returnedStats := returned.Stats[i]
-		if !expectedStats.Eq(returnedStats) {
-			t.Errorf("received unexpected stats")
-		}
-	}
-
-	for i, expectedSample := range cinfo.Samples {
-		returnedSample := returned.Samples[i]
-		if !expectedSample.Eq(returnedSample) {
-			t.Errorf("received unexpected sample")
-		}
+	if !returned.Eq(cinfo) {
+		t.Error("received unexpected ContainerInfo")
 	}
 }

third_party/src/github.com/google/cadvisor/container/docker/handler.go

@@ -21,12 +21,14 @@ import (
 	"math"
 	"os"
 	"path"
+	"path/filepath"
 	"strings"
 	"time"
 
 	"github.com/docker/libcontainer"
 	"github.com/docker/libcontainer/cgroups"
 	"github.com/docker/libcontainer/cgroups/fs"
+	"github.com/docker/libcontainer/cgroups/systemd"
 	"github.com/fsouza/go-dockerclient"
 	"github.com/google/cadvisor/container"
 	"github.com/google/cadvisor/info"
@@ -98,8 +100,11 @@ func (self *dockerContainerHandler) splitName() (string, string, error) {
 	if nestedLevels > 0 {
 		// we are running inside a docker container
 		upperLevel := strings.Repeat("../../", nestedLevels)
-		//parent = strings.Join([]string{parent, upperLevel}, "/")
-		parent = fmt.Sprintf("%v%v", upperLevel, parent)
+		parent = filepath.Join(upperLevel, parent)
+	}
+	// Strip the last "/"
+	if parent[len(parent)-1] == '/' {
+		parent = parent[:len(parent)-1]
 	}
 	return parent, id, nil
 }
@@ -237,7 +242,15 @@ func (self *dockerContainerHandler) GetStats() (stats *info.ContainerStats, err
 		Parent: parent,
 		Name:   id,
 	}
-	s, err := fs.GetStats(cg)
+
+	// TODO(vmarmol): Use libcontainer's Stats() in the new API when that is ready.
+	// Use systemd paths if systemd is being used.
+	var s *cgroups.Stats
+	if systemd.UseSystemd() {
+		s, err = systemd.GetStats(cg)
+	} else {
+		s, err = fs.GetStats(cg)
+	}
 	if err != nil {
 		return
 	}

third_party/src/github.com/google/cadvisor/deploy/docker-only/Dockerfile

@@ -2,7 +2,7 @@ FROM busybox:ubuntu-14.04
 MAINTAINER kyurtsever@google.com dengnan@google.com vmarmol@google.com jason@swindle.me
 
 # Get cAdvisor binaries.
-ADD http://storage.googleapis.com/cadvisor-bin/cadvisor /usr/bin/cadvisor
+ADD http://storage.googleapis.com/cadvisor-bin/cadvisor-0.1.3 /usr/bin/cadvisor
 RUN chmod +x /usr/bin/cadvisor
 
 EXPOSE 8080

third_party/src/github.com/google/cadvisor/deploy/lmctfy-docker/Dockerfile

@@ -7,7 +7,7 @@ RUN apt-get update && apt-get install -y -q --no-install-recommends pkg-config l
 # Get the lcmtfy and cAdvisor binaries.
 ADD http://storage.googleapis.com/cadvisor-bin/lmctfy/lmctfy /usr/bin/lmctfy
 ADD http://storage.googleapis.com/cadvisor-bin/lmctfy/libre2.so.0.0.0 /usr/lib/libre2.so.0
-ADD http://storage.googleapis.com/cadvisor-bin/cadvisor-0.1.2 /usr/bin/cadvisor
+ADD http://storage.googleapis.com/cadvisor-bin/cadvisor-0.1.3 /usr/bin/cadvisor
 RUN chmod +x /usr/bin/lmctfy && chmod +x /usr/bin/cadvisor
 
 EXPOSE 8080

third_party/src/github.com/google/cadvisor/info/container.go

@@ -110,6 +110,52 @@ type ContainerInfo struct {
 	StatsPercentiles *ContainerStatsPercentiles `json:"stats_summary,omitempty"`
 }
 
+// ContainerInfo may be (un)marshaled by json or other en/decoder. In that
+// case, the Timestamp field in each stats/sample may not be precisely
+// en/decoded.  This will lead to small but acceptable differences between a
+// ContainerInfo and its encode-then-decode version.  Eq() is used to compare
+// two ContainerInfo accepting small difference (<10ms) of Time fields.
+func (self *ContainerInfo) Eq(b *ContainerInfo) bool {
+
+	// If both self and b are nil, then Eq() returns true
+	if self == nil {
+		return b == nil
+	}
+	if b == nil {
+		return self == nil
+	}
+
+	// For fields other than time.Time, we will compare them precisely.
+	// This would require that any slice should have same order.
+	if !reflect.DeepEqual(self.ContainerReference, b.ContainerReference) {
+		return false
+	}
+	if !reflect.DeepEqual(self.Subcontainers, b.Subcontainers) {
+		return false
+	}
+	if !reflect.DeepEqual(self.Spec, b.Spec) {
+		return false
+	}
+	if !reflect.DeepEqual(self.StatsPercentiles, b.StatsPercentiles) {
+		return false
+	}
+
+	for i, expectedStats := range b.Stats {
+		selfStats := self.Stats[i]
+		if !expectedStats.Eq(selfStats) {
+			return false
+		}
+	}
+
+	for i, expectedSample := range b.Samples {
+		selfSample := self.Samples[i]
+		if !expectedSample.Eq(selfSample) {
+			return false
+		}
+	}
+	return true
+}
+
 func (self *ContainerInfo) StatsAfter(ref time.Time) []*ContainerStats {
 	n := len(self.Stats) + 1
 	for i, s := range self.Stats {

third_party/src/github.com/google/cadvisor/info/version.go

@@ -15,4 +15,4 @@
 package info
 
 // Version of cAdvisor.
-const VERSION = "0.1.2"
+const VERSION = "0.1.3"