main.go

Documentation: github.com/chaos-mesh/chaos-mesh/e2e-test/cmd/e2e_helper

     1  // Copyright 2021 Chaos Mesh Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  // http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  //
    15  
    16  package main
    17  
    18  import (
    19  	"bytes"
    20  	"encoding/json"
    21  	"flag"
    22  	"fmt"
    23  	"io"
    24  	"io/ioutil"
    25  	"net"
    26  	"net/http"
    27  	"os"
    28  	"path/filepath"
    29  	"time"
    30  
    31  	"github.com/containerd/cgroups"
    32  )
    33  
    34  func main() {
    35  	port := flag.Int("port", 8080, "listen port")
    36  	dataDir := flag.String("data-dir", "/var/run/data", "data dir is the dir to write temp file, only used in io test")
    37  
    38  	flag.Parse()
    39  
    40  	s := newServer(*dataDir)
    41  	err := s.setupUDPServer()
    42  	if err != nil {
    43  		fmt.Println("failed to serve udp server", err)
    44  		os.Exit(1)
    45  	}
    46  
    47  	addr := fmt.Sprintf("0.0.0.0:%d", *port)
    48  	if err := http.ListenAndServe(addr, s.mux); err != nil {
    49  		fmt.Println("failed to serve http server", err)
    50  		os.Exit(1)
    51  	}
    52  }
    53  
    54  type server struct {
    55  	mux     *http.ServeMux
    56  	dataDir string
    57  
    58  	// ONLY FOR TEST: a buf without lock
    59  	recvBuf []byte
    60  }
    61  
    62  func newServer(dataDir string) *server {
    63  	s := &server{
    64  		mux:     http.NewServeMux(),
    65  		dataDir: dataDir,
    66  		recvBuf: make([]byte, 5),
    67  	}
    68  	s.mux.HandleFunc("/ping", pong)
    69  	s.mux.HandleFunc("/time", s.timer)
    70  	s.mux.HandleFunc("/io", s.ioTest)
    71  	s.mux.HandleFunc("/mistake", s.mistakeTest)
    72  	s.mux.HandleFunc("/network/send", s.networkSendTest)
    73  	s.mux.HandleFunc("/network/recv", s.networkRecvTest)
    74  	s.mux.HandleFunc("/network/ping", s.networkPingTest)
    75  	s.mux.HandleFunc("/dns", s.dnsTest)
    76  	s.mux.HandleFunc("/stress", s.stressCondition)
    77  	s.mux.HandleFunc("/http", s.httpEcho)
    78  	return s
    79  }
    80  
    81  func pong(w http.ResponseWriter, _ *http.Request) {
    82  	w.Write([]byte("pong"))
    83  }
    84  
    85  func (s *server) setupUDPServer() error {
    86  	pc, err := net.ListenPacket("udp", "0.0.0.0:1070")
    87  	if err != nil {
    88  		return err
    89  	}
    90  
    91  	go func() {
    92  		for {
    93  			_, _, err := pc.ReadFrom(s.recvBuf)
    94  			fmt.Println("receive buf " + string(s.recvBuf))
    95  			if err != nil {
    96  				return
    97  			}
    98  		}
    99  	}()
   100  
   101  	return nil
   102  }
   103  
   104  // a handler to print out the current time
   105  func (s *server) timer(w http.ResponseWriter, _ *http.Request) {
   106  	w.Write([]byte(time.Now().Format(time.RFC3339Nano)))
   107  }
   108  
   109  // a handler to test io chaos
   110  func (s *server) mistakeTest(w http.ResponseWriter, _ *http.Request) {
   111  	path := filepath.Join(s.dataDir, "e2e-test")
   112  	origData := []byte("hello world!!!!!!!!!!!!")
   113  
   114  	err := ioutil.WriteFile(path, origData, 0644)
   115  	if err != nil {
   116  		w.Write([]byte(fmt.Sprintf("failed to write file %v", err)))
   117  		return
   118  	}
   119  	gotData, err := ioutil.ReadFile(path)
   120  	if err != nil {
   121  		w.Write([]byte(err.Error()))
   122  		return
   123  	}
   124  	result := bytes.Equal(origData, gotData)
   125  	if result {
   126  		w.Write([]byte("false"))
   127  		return
   128  	}
   129  	for i := 0; i < 10; i++ {
   130  		tmp, err := ioutil.ReadFile(path)
   131  		if err != nil {
   132  			w.Write([]byte(err.Error()))
   133  		}
   134  		if !bytes.Equal(tmp, gotData) {
   135  			w.Write([]byte("true"))
   136  			return
   137  		}
   138  	}
   139  	w.Write([]byte("err"))
   140  }
   141  
   142  // a handler to test io chaos
   143  func (s *server) ioTest(w http.ResponseWriter, _ *http.Request) {
   144  	t1 := time.Now()
   145  	f, err := ioutil.TempFile(s.dataDir, "e2e-test")
   146  	if err != nil {
   147  		w.Write([]byte(fmt.Sprintf("failed to create temp file %v", err)))
   148  		return
   149  	}
   150  	if _, err := f.Write([]byte("hello world")); err != nil {
   151  		w.Write([]byte(fmt.Sprintf("failed to write file %v", err)))
   152  		return
   153  	}
   154  	t2 := time.Now()
   155  	w.Write([]byte(t2.Sub(t1).String()))
   156  }
   157  
   158  // a handler to test dns chaos
   159  func (s *server) dnsTest(w http.ResponseWriter, r *http.Request) {
   160  
   161  	url, ok := r.URL.Query()["url"]
   162  
   163  	if !ok || len(url[0]) < 1 {
   164  		http.Error(w, "failed", http.StatusBadRequest)
   165  		return
   166  	}
   167  
   168  	ips, err := net.LookupIP(url[0])
   169  	if err != nil {
   170  		http.Error(w, "failed", http.StatusBadRequest)
   171  		return
   172  	}
   173  
   174  	if len(ips) == 0 {
   175  		http.Error(w, "failed", http.StatusBadRequest)
   176  		return
   177  	}
   178  
   179  	w.Write([]byte(ips[0].String()))
   180  }
   181  
   182  type networkSendTestBody struct {
   183  	TargetIP string `json:"targetIP"`
   184  }
   185  
   186  // a handler to test network chaos
   187  func (s *server) networkPingTest(w http.ResponseWriter, r *http.Request) {
   188  	var body networkSendTestBody
   189  
   190  	err := json.NewDecoder(r.Body).Decode(&body)
   191  	if err != nil {
   192  		http.Error(w, err.Error(), http.StatusBadRequest)
   193  		return
   194  	}
   195  
   196  	c := http.Client{
   197  		Timeout: 2 * time.Second,
   198  	}
   199  	startTime := time.Now()
   200  	resp, err := c.Get(fmt.Sprintf("http://%s:8080/ping", body.TargetIP))
   201  	if err != nil {
   202  		http.Error(w, err.Error(), http.StatusBadRequest)
   203  		return
   204  	}
   205  	defer resp.Body.Close()
   206  
   207  	endTime := time.Now()
   208  	out, err := ioutil.ReadAll(resp.Body)
   209  	if err != nil {
   210  		http.Error(w, err.Error(), http.StatusBadRequest)
   211  		return
   212  	}
   213  
   214  	if string(out) != "pong" {
   215  		http.Error(w, "response is not pong", http.StatusBadRequest)
   216  		return
   217  	}
   218  
   219  	w.Write([]byte(fmt.Sprintf("OK %d", endTime.UnixNano()-startTime.UnixNano())))
   220  }
   221  
   222  // a handler to test network chaos
   223  func (s *server) networkSendTest(w http.ResponseWriter, r *http.Request) {
   224  	var body networkSendTestBody
   225  
   226  	err := json.NewDecoder(r.Body).Decode(&body)
   227  	if err != nil {
   228  		http.Error(w, err.Error(), http.StatusBadRequest)
   229  		return
   230  	}
   231  
   232  	conn, err := net.DialUDP("udp", nil, &net.UDPAddr{
   233  		IP:   net.ParseIP(body.TargetIP),
   234  		Port: 1070,
   235  	})
   236  	if err != nil {
   237  		http.Error(w, err.Error(), http.StatusBadRequest)
   238  		return
   239  	}
   240  	defer conn.Close()
   241  
   242  	n, err := io.WriteString(conn, "ping\n")
   243  	if err != nil {
   244  		http.Error(w, err.Error(), http.StatusBadRequest)
   245  		return
   246  	}
   247  	if n != 5 {
   248  		http.Error(w, "udp send less than 5 bytes", http.StatusBadRequest)
   249  		return
   250  	}
   251  	w.Write([]byte("send successfully\n"))
   252  }
   253  
   254  // a handler to test network chaos
   255  func (s *server) networkRecvTest(w http.ResponseWriter, r *http.Request) {
   256  	w.Write(s.recvBuf)
   257  
   258  	s.recvBuf = []byte{}
   259  }
   260  
   261  func (s *server) stressCondition(w http.ResponseWriter, r *http.Request) {
   262  	control, err := cgroups.Load(cgroups.V1, cgroups.PidPath(1))
   263  	if err != nil {
   264  		http.Error(w, err.Error(), http.StatusInternalServerError)
   265  		return
   266  	}
   267  
   268  	stats, err := control.Stat(cgroups.IgnoreNotExist)
   269  	if err != nil {
   270  		http.Error(w, err.Error(), http.StatusInternalServerError)
   271  		return
   272  	}
   273  
   274  	response, err := json.Marshal(map[string]uint64{
   275  		"cpuTime":     stats.CPU.Usage.Total,
   276  		"memoryUsage": stats.Memory.Usage.Usage - stats.Memory.Kernel.Usage - stats.Memory.Cache,
   277  	})
   278  	if err != nil {
   279  		http.Error(w, "fail to marshal response", http.StatusInternalServerError)
   280  		return
   281  	}
   282  
   283  	w.Write(response)
   284  }
   285  
   286  func (s *server) httpEcho(w http.ResponseWriter, r *http.Request) {
   287  	secrets := r.Header["Secret"]
   288  	if len(secrets) == 0 {
   289  		http.Error(w, "Forbidden", http.StatusForbidden)
   290  		return
   291  	}
   292  
   293  	for _, secret := range secrets {
   294  		w.Header().Add("Secret", secret)
   295  	}
   296  	defer r.Body.Close()
   297  	_, err := io.Copy(w, r.Body)
   298  	if err != nil {
   299  		http.Error(w, "fail to copy body between request and response", http.StatusInternalServerError)
   300  		return
   301  	}
   302  }
   303