main.go

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

     1  // Copyright 2020 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  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package main
    15  
    16  import (
    17  	"bytes"
    18  	"encoding/json"
    19  	"flag"
    20  	"fmt"
    21  	"io"
    22  	"io/ioutil"
    23  	"net"
    24  	"net/http"
    25  	"os"
    26  	"path/filepath"
    27  	"time"
    28  )
    29  
    30  func main() {
    31  	port := flag.Int("port", 8080, "listen port")
    32  	dataDir := flag.String("data-dir", "/var/run/data", "data dir is the dir to write temp file, only used in io test")
    33  
    34  	flag.Parse()
    35  
    36  	s := newServer(*dataDir)
    37  	err := s.setupUDPServer()
    38  	if err != nil {
    39  		fmt.Println("failed to serve udp server", err)
    40  		os.Exit(1)
    41  	}
    42  
    43  	addr := fmt.Sprintf("0.0.0.0:%d", *port)
    44  	if err := http.ListenAndServe(addr, s.mux); err != nil {
    45  		fmt.Println("failed to serve http server", err)
    46  		os.Exit(1)
    47  	}
    48  }
    49  
    50  type server struct {
    51  	mux     *http.ServeMux
    52  	dataDir string
    53  
    54  	// ONLY FOR TEST: a buf without lock
    55  	recvBuf []byte
    56  }
    57  
    58  func newServer(dataDir string) *server {
    59  	s := &server{
    60  		mux:     http.NewServeMux(),
    61  		dataDir: dataDir,
    62  		recvBuf: make([]byte, 5),
    63  	}
    64  	s.mux.HandleFunc("/ping", pong)
    65  	s.mux.HandleFunc("/time", s.timer)
    66  	s.mux.HandleFunc("/io", s.ioTest)
    67  	s.mux.HandleFunc("/mistake", s.mistakeTest)
    68  	s.mux.HandleFunc("/network/send", s.networkSendTest)
    69  	s.mux.HandleFunc("/network/recv", s.networkRecvTest)
    70  	s.mux.HandleFunc("/network/ping", s.networkPingTest)
    71  	s.mux.HandleFunc("/dns", s.dnsTest)
    72  	return s
    73  }
    74  
    75  func pong(w http.ResponseWriter, _ *http.Request) {
    76  	w.Write([]byte("pong"))
    77  }
    78  
    79  func (s *server) setupUDPServer() error {
    80  	pc, err := net.ListenPacket("udp", "0.0.0.0:1070")
    81  	if err != nil {
    82  		return err
    83  	}
    84  
    85  	go func() {
    86  		for {
    87  			_, _, err := pc.ReadFrom(s.recvBuf)
    88  			if err != nil {
    89  				return
    90  			}
    91  		}
    92  	}()
    93  
    94  	return nil
    95  }
    96  
    97  // a handler to print out the current time
    98  func (s *server) timer(w http.ResponseWriter, _ *http.Request) {
    99  	w.Write([]byte(time.Now().Format(time.RFC3339Nano)))
   100  }
   101  
   102  // a handler to test io chaos
   103  func (s *server) mistakeTest(w http.ResponseWriter, _ *http.Request) {
   104  	path := filepath.Join(s.dataDir, "e2e-test")
   105  	origData := []byte("hello world!!!!!!!!!!!!")
   106  
   107  	err := ioutil.WriteFile(path, origData, 0644)
   108  	if err != nil {
   109  		w.Write([]byte(fmt.Sprintf("failed to write file %v", err)))
   110  		return
   111  	}
   112  	gotData, err := ioutil.ReadFile(path)
   113  	if err != nil {
   114  		w.Write([]byte(err.Error()))
   115  		return
   116  	}
   117  	result := bytes.Equal(origData, gotData)
   118  	if result {
   119  		w.Write([]byte("false"))
   120  		return
   121  	}
   122  	for i := 0; i < 10; i++ {
   123  		tmp, err := ioutil.ReadFile(path)
   124  		if err != nil {
   125  			w.Write([]byte(err.Error()))
   126  		}
   127  		if !bytes.Equal(tmp, gotData) {
   128  			w.Write([]byte("true"))
   129  			return
   130  		}
   131  	}
   132  	w.Write([]byte("err"))
   133  }
   134  
   135  // a handler to test io chaos
   136  func (s *server) ioTest(w http.ResponseWriter, _ *http.Request) {
   137  	t1 := time.Now()
   138  	f, err := ioutil.TempFile(s.dataDir, "e2e-test")
   139  	if err != nil {
   140  		w.Write([]byte(fmt.Sprintf("failed to create temp file %v", err)))
   141  		return
   142  	}
   143  	if _, err := f.Write([]byte("hello world")); err != nil {
   144  		w.Write([]byte(fmt.Sprintf("failed to write file %v", err)))
   145  		return
   146  	}
   147  	t2 := time.Now()
   148  	w.Write([]byte(t2.Sub(t1).String()))
   149  }
   150  
   151  // a handler to test dns chaos
   152  func (s *server) dnsTest(w http.ResponseWriter, r *http.Request) {
   153  
   154  	url, ok := r.URL.Query()["url"]
   155  
   156  	if !ok || len(url[0]) < 1 {
   157  		http.Error(w, "failed", http.StatusBadRequest)
   158  		return
   159  	}
   160  
   161  	ips, err := net.LookupIP(url[0])
   162  	if err != nil {
   163  		http.Error(w, "failed", http.StatusBadRequest)
   164  		return
   165  	}
   166  
   167  	if len(ips) == 0 {
   168  		http.Error(w, "failed", http.StatusBadRequest)
   169  		return
   170  	}
   171  
   172  	w.Write([]byte(ips[0].String()))
   173  }
   174  
   175  type networkSendTestBody struct {
   176  	TargetIP string `json:"targetIP"`
   177  }
   178  
   179  // a handler to test network chaos
   180  func (s *server) networkPingTest(w http.ResponseWriter, r *http.Request) {
   181  	var body networkSendTestBody
   182  
   183  	err := json.NewDecoder(r.Body).Decode(&body)
   184  	if err != nil {
   185  		http.Error(w, err.Error(), http.StatusBadRequest)
   186  		return
   187  	}
   188  
   189  	c := http.Client{
   190  		Timeout: 2 * time.Second,
   191  	}
   192  	startTime := time.Now()
   193  	resp, err := c.Get(fmt.Sprintf("http://%s:8080/ping", body.TargetIP))
   194  	if err != nil {
   195  		http.Error(w, err.Error(), http.StatusBadRequest)
   196  		return
   197  	}
   198  	defer resp.Body.Close()
   199  
   200  	endTime := time.Now()
   201  	out, err := ioutil.ReadAll(resp.Body)
   202  	if err != nil {
   203  		http.Error(w, err.Error(), http.StatusBadRequest)
   204  		return
   205  	}
   206  
   207  	if string(out) != "pong" {
   208  		http.Error(w, "response is not pong", http.StatusBadRequest)
   209  		return
   210  	}
   211  
   212  	w.Write([]byte(fmt.Sprintf("OK %d", endTime.UnixNano()-startTime.UnixNano())))
   213  }
   214  
   215  // a handler to test network chaos
   216  func (s *server) networkSendTest(w http.ResponseWriter, r *http.Request) {
   217  	var body networkSendTestBody
   218  
   219  	err := json.NewDecoder(r.Body).Decode(&body)
   220  	if err != nil {
   221  		http.Error(w, err.Error(), http.StatusBadRequest)
   222  		return
   223  	}
   224  
   225  	conn, err := net.DialUDP("udp", nil, &net.UDPAddr{
   226  		IP:   net.ParseIP(body.TargetIP),
   227  		Port: 1070,
   228  	})
   229  	if err != nil {
   230  		http.Error(w, err.Error(), http.StatusBadRequest)
   231  		return
   232  	}
   233  	defer conn.Close()
   234  
   235  	n, err := io.WriteString(conn, "ping\n")
   236  	if err != nil {
   237  		http.Error(w, err.Error(), http.StatusBadRequest)
   238  		return
   239  	}
   240  	if n != 5 {
   241  		http.Error(w, "udp send less than 5 bytes", http.StatusBadRequest)
   242  		return
   243  	}
   244  	w.Write([]byte("send successfully\n"))
   245  }
   246  
   247  // a handler to test network chaos
   248  func (s *server) networkRecvTest(w http.ResponseWriter, r *http.Request) {
   249  	w.Write(s.recvBuf)
   250  
   251  	for index := range s.recvBuf {
   252  		s.recvBuf[index] = 0
   253  	}
   254  }
   255