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// 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"
"fmt"
"net/http"
"net/http/httptest"
"path"
"reflect"
"strings"
"testing"
"time"
info "github.com/google/cadvisor/info/v1"
itest "github.com/google/cadvisor/info/v1/test"
"github.com/stretchr/testify/assert"
)
func cadvisorTestClient(path string, expectedPostObj *info.ContainerInfoRequest, replyObj interface{}, t *testing.T) (*Client, *httptest.Server, error) {
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == path {
if expectedPostObj != nil {
expectedPostObjEmpty := new(info.ContainerInfoRequest)
decoder := json.NewDecoder(r.Body)
if err := decoder.Decode(expectedPostObjEmpty); err != nil {
t.Errorf("Received invalid object: %v", err)
}
if expectedPostObj.NumStats != expectedPostObjEmpty.NumStats ||
expectedPostObj.Start.Unix() != expectedPostObjEmpty.Start.Unix() ||
expectedPostObj.End.Unix() != expectedPostObjEmpty.End.Unix() {
t.Errorf("Received unexpected object: %+v, expected: %+v", expectedPostObjEmpty, expectedPostObj)
}
}
encoder := json.NewEncoder(w)
err := encoder.Encode(replyObj)
assert.NoError(t, err)
} else {
w.WriteHeader(http.StatusNotFound)
fmt.Fprintf(w, "Page not found.")
}
}))
client, err := NewClient(ts.URL)
if err != nil {
ts.Close()
return nil, nil, err
}
return client, ts, err
}
// TestGetMachineInfo performs one test to check if MachineInfo()
// in a cAdvisor client returns the correct result.
func TestGetMachineinfo(t *testing.T) {
minfo := &info.MachineInfo{
NumCores: 8,
MemoryCapacity: 31625871360,
DiskMap: map[string]info.DiskInfo{
"8:0": {
Name: "sda",
Major: 8,
Minor: 0,
Size: 10737418240,
},
},
}
client, server, err := cadvisorTestClient("/api/v1.3/machine", nil, minfo, t)
if err != nil {
t.Fatalf("unable to get a client %v", err)
}
defer server.Close()
returned, err := client.MachineInfo()
if err != nil {
t.Fatal(err)
}
if !reflect.DeepEqual(returned, minfo) {
t.Fatalf("received unexpected machine info")
}
}
// TestGetContainerInfo generates a random container information object
// and then checks that ContainerInfo returns the expected result.
func TestGetContainerInfo(t *testing.T) {
query := &info.ContainerInfoRequest{
NumStats: 3,
}
containerName := "/some/container"
cinfo := itest.GenerateRandomContainerInfo(containerName, 4, query, 1*time.Second)
client, server, err := cadvisorTestClient(fmt.Sprintf("/api/v1.3/containers%v", containerName), query, cinfo, t)
if err != nil {
t.Fatalf("unable to get a client %v", err)
}
defer server.Close()
returned, err := client.ContainerInfo(containerName, query)
if err != nil {
t.Fatal(err)
}
if !returned.Eq(cinfo) {
t.Error("received unexpected ContainerInfo")
}
}
// Test a request failing
func TestRequestFails(t *testing.T) {
errorText := "there was an error"
// Setup a server that simply fails.
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
http.Error(w, errorText, 500)
}))
client, err := NewClient(ts.URL)
if err != nil {
ts.Close()
t.Fatal(err)
}
defer ts.Close()
_, err = client.ContainerInfo("/", &info.ContainerInfoRequest{NumStats: 3})
if err == nil {
t.Fatalf("Expected non-nil error")
}
expectedError := fmt.Sprintf("request failed with error: %q", errorText)
if strings.Contains(err.Error(), expectedError) {
t.Fatalf("Expected error %q but received %q", expectedError, err)
}
}
func TestGetSubcontainersInfo(t *testing.T) {
query := &info.ContainerInfoRequest{
NumStats: 3,
}
containerName := "/some/container"
cinfo := itest.GenerateRandomContainerInfo(containerName, 4, query, 1*time.Second)
cinfo1 := itest.GenerateRandomContainerInfo(path.Join(containerName, "sub1"), 4, query, 1*time.Second)
cinfo2 := itest.GenerateRandomContainerInfo(path.Join(containerName, "sub2"), 4, query, 1*time.Second)
response := []info.ContainerInfo{
*cinfo,
*cinfo1,
*cinfo2,
}
client, server, err := cadvisorTestClient(fmt.Sprintf("/api/v1.3/subcontainers%v", containerName), query, response, t)
if err != nil {
t.Fatalf("unable to get a client %v", err)
}
defer server.Close()
returned, err := client.SubcontainersInfo(containerName, query)
if err != nil {
t.Fatal(err)
}
if len(returned) != 3 {
t.Errorf("unexpected number of results: got %d, expected 3", len(returned))
}
if !returned[0].Eq(cinfo) {
t.Error("received unexpected ContainerInfo")
}
if !returned[1].Eq(cinfo1) {
t.Error("received unexpected ContainerInfo")
}
if !returned[2].Eq(cinfo2) {
t.Error("received unexpected ContainerInfo")
}
}
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