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ping.go
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ping.go
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// Package ping tries to ping a HTTP server through different ways
// Connection, Session (Head), Get and Post
package ping
import (
"context"
"crypto/tls"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/http/httptrace"
"net/url"
"os"
"os/signal"
"regexp"
"strings"
"time"
"github.com/xianwangs/mylg/cli"
)
var stdout *os.File
// Ping represents HTTP ping request
type Ping struct {
url string
host string
interval time.Duration
timeout time.Duration
count int
method string
uAgent string
buf string
transport *http.Transport
rAddr net.Addr
nsTime time.Duration
quiet bool
dCompress bool
kAlive bool
TLSSkipVerify bool
tracerEnabled bool
fmtJSON bool
ipv4 bool
ipv6 bool
}
// Result holds Ping result
type Result struct {
StatusCode int
TotalTime float64
Size int
Proto string
Server string
Status string
Trace Trace
}
// Trace holds trace results
type Trace struct {
ConnectionTime float64
TimeToFirstByte float64
}
func (p Ping) IPVersion(t string) string {
if p.ipv4 {
return fmt.Sprintf("%s4", t)
} else if p.ipv6 {
return fmt.Sprintf("%s6", t)
}
// Not specified, use happy eyeballs
return t
}
// PrintPingResult prints result from each individual ping
func (r Result) PrintPingResult(p *Ping, seq int, err error) {
pStrPrefix := "HTTP Response seq=%d, "
pStrSuffix := "proto=%s, status=%d, size=%d Bytes, time=%.3f ms"
pStrSuffixHead := "proto=%s, status=%d, time=%.3f ms"
pStrTrace := ", connection=%.3f ms, first byte read=%.3f ms\n"
if p.quiet {
if err != nil {
fmt.Printf("!")
return
}
fmt.Printf(".")
return
}
if err != nil {
errmsg := strings.Split(err.Error(), ": ")
fmt.Printf(pStrPrefix+"%s\n", seq, errmsg[len(errmsg)-1])
return
}
if p.method == "HEAD" {
if p.tracerEnabled {
fmt.Printf(pStrPrefix+pStrSuffixHead+pStrTrace, seq, r.Proto, r.StatusCode, r.TotalTime*1e3, r.Trace.ConnectionTime, r.Trace.TimeToFirstByte)
return
}
fmt.Printf(pStrPrefix+pStrSuffixHead+"\n", seq, r.Proto, r.StatusCode, r.TotalTime*1e3)
return
}
if p.tracerEnabled {
fmt.Printf(pStrPrefix+pStrSuffix+pStrTrace, seq, r.Proto, r.StatusCode, r.Size, r.TotalTime*1e3, r.Trace.ConnectionTime, r.Trace.TimeToFirstByte)
return
}
fmt.Printf(pStrPrefix+pStrSuffix+"\n", seq, r.Proto, r.StatusCode, r.Size, r.TotalTime*1e3)
return
}
// NewPing validate and constructs request object
func NewPing(args string, cfg cli.Config) (*Ping, error) {
URL, flag := cli.Flag(args)
// help
if _, ok := flag["help"]; ok || URL == "" {
help(cfg)
return nil, fmt.Errorf("")
}
URL = Normalize(URL)
u, err := url.Parse(URL)
if err != nil {
return &Ping{}, fmt.Errorf("cannot parse url")
}
host, _, err := net.SplitHostPort(u.Host)
if err != nil {
host = u.Host
}
sTime := time.Now()
p := &Ping{
url: URL,
host: u.Host,
buf: cli.SetFlag(flag, "d", "mylg").(string),
count: cli.SetFlag(flag, "c", cfg.Hping.Count).(int),
tracerEnabled: cli.SetFlag(flag, "trace", false).(bool),
fmtJSON: cli.SetFlag(flag, "json", false).(bool),
uAgent: cli.SetFlag(flag, "u", "myLG (http://mylg.io)").(string),
dCompress: cli.SetFlag(flag, "dc", false).(bool),
kAlive: cli.SetFlag(flag, "k", false).(bool),
TLSSkipVerify: cli.SetFlag(flag, "nc", false).(bool),
quiet: cli.SetFlag(flag, "q", false).(bool),
ipv4: cli.SetFlag(flag, "4", false).(bool),
ipv6: cli.SetFlag(flag, "6", false).(bool),
nsTime: time.Since(sTime),
}
ipAddr, err := net.ResolveIPAddr(p.IPVersion("ip"), host)
if err != nil {
return &Ping{}, fmt.Errorf("cannot resolve %s: Unknown host", host)
}
p.rAddr = ipAddr
// set interval
interval := cli.SetFlag(flag, "i", cfg.Hping.Interval).(string)
p.interval, err = time.ParseDuration(interval)
if err != nil {
return p, fmt.Errorf("Failed to parse interval: %s. Correct syntax is <number>s/ms", err)
}
// set timeout
timeout := cli.SetFlag(flag, "t", cfg.Hping.Timeout).(string)
p.timeout, err = time.ParseDuration(timeout)
if err != nil {
return p, fmt.Errorf("Failed to parse timeout: %s. Correct syntax is <number>s/ms", err)
}
// set method
p.method = cli.SetFlag(flag, "m", cfg.Hping.Method).(string)
p.method = strings.ToUpper(p.method)
// set mute stdout once json requested
if p.fmtJSON {
muteStdout()
}
p.setTransport()
return p, nil
}
// Normalize fixes scheme
func Normalize(URL string) string {
re := regexp.MustCompile(`(?i)https{0,1}://`)
if !re.MatchString(URL) {
URL = fmt.Sprintf("http://%s", URL)
}
return URL
}
// Run tries to ping w/ pretty print
func (p *Ping) Run() {
if p.method != "GET" && p.method != "POST" && p.method != "HEAD" {
fmt.Printf("Error: Method '%s' not recognized.\n", p.method)
return
}
var (
sigCh = make(chan os.Signal, 1)
c = make(map[int]float64, 10)
s []float64
)
// capture interrupt w/ s channel
signal.Notify(sigCh, os.Interrupt)
defer signal.Stop(sigCh)
fmt.Printf("HPING %s (%s), Method: %s, DNSLookup: %.4f ms\n", p.host, p.rAddr, p.method, p.nsTime.Seconds()*1e3)
LOOP:
for i := 0; i < p.count; i++ {
if r, err := p.Ping(); err == nil {
r.PrintPingResult(p, i, err)
c[r.StatusCode]++
s = append(s, r.TotalTime*1e3)
} else {
c[-1]++
r.PrintPingResult(p, i, err)
}
select {
case <-sigCh:
break LOOP
default:
}
time.Sleep(p.interval)
}
// print statistics
if p.fmtJSON {
unMuteStdout()
p.printStatsJSON(c, s)
} else {
p.printStats(c, s)
}
}
// printStats prints out the footer
func (p *Ping) printStats(c map[int]float64, s []float64) {
r := calcStats(c, s)
totalReq := r["sum"] + c[-1]
failPct := 100 - (100*r["sum"])/totalReq
fmt.Printf("\n--- %s HTTP ping statistics --- \n", p.host)
fmt.Printf("%.0f requests transmitted, %.0f replies received, %.0f%% requests failed\n", totalReq, r["sum"], failPct)
fmt.Printf("HTTP Round-trip min/avg/max = %.2f/%.2f/%.2f ms\n", r["min"], r["avg"], r["max"])
for k, v := range c {
if k < 0 {
continue
}
progress := fmt.Sprintf("%-20s", strings.Repeat("\u2588", int(v*100/(totalReq)/5)))
fmt.Printf("HTTP Code [%d] responses : [%s] %.2f%% \n", k, progress, v*100/(totalReq))
}
}
// printStats prints out in json format
func (p *Ping) printStatsJSON(c map[int]float64, s []float64) {
var statusCode = make(map[int]float64, 10)
r := calcStats(c, s)
totalReq := r["sum"] + c[-1]
failPct := 100 - (100*r["sum"])/totalReq
for k, v := range c {
if k < 0 {
continue
}
statusCode[k] = v * 100 / (totalReq)
}
trace := struct {
Host string `json:"host"`
DNSLookup float64 `json:"dnslookup"`
Count int `json:"count"`
Min float64 `json:"min"`
Avg float64 `json:"avg"`
Max float64 `json:"max"`
Failure float64 `json:"failure"`
StatusCodes map[int]float64 `json:"statuscodes"`
}{
p.host,
p.nsTime.Seconds() * 1e3,
p.count,
r["min"],
r["avg"],
r["max"],
failPct,
statusCode,
}
b, err := json.Marshal(trace)
if err != nil {
}
fmt.Println(string(b))
}
// setTransport set transport
func (p *Ping) setTransport() {
p.transport = &http.Transport{
DisableKeepAlives: !p.kAlive,
DisableCompression: p.dCompress,
TLSClientConfig: &tls.Config{
InsecureSkipVerify: p.TLSSkipVerify,
},
Proxy: http.ProxyFromEnvironment,
DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
return net.Dial(p.IPVersion("tcp"), addr)
},
}
}
// Ping tries to ping a web server through http
func (p *Ping) Ping() (Result, error) {
var (
r Result
sTime time.Time
resp *http.Response
req *http.Request
err error
)
client := &http.Client{
CheckRedirect: func(req *http.Request, via []*http.Request) error {
// Don't follow redirects
return http.ErrUseLastResponse
},
Timeout: p.timeout,
Transport: p.transport,
}
sTime = time.Now()
if p.method == "POST" {
r.Size = len(p.buf)
reader := strings.NewReader(p.buf)
req, err = http.NewRequest(p.method, p.url, reader)
} else {
req, err = http.NewRequest(p.method, p.url, nil)
}
if err != nil {
return r, err
}
// customized header
req.Header.Add("User-Agent", p.uAgent)
// context, tracert
if p.tracerEnabled && !p.quiet {
req = req.WithContext(httptrace.WithClientTrace(req.Context(), tracer(&r)))
}
resp, err = client.Do(req)
if err != nil {
return r, err
}
defer resp.Body.Close()
r.TotalTime = time.Since(sTime).Seconds()
if p.method == "GET" {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return r, err
}
r.Size = len(body)
} else {
io.Copy(ioutil.Discard, resp.Body)
}
r.StatusCode = resp.StatusCode
r.Proto = resp.Proto
return r, nil
}
func tracer(r *Result) *httptrace.ClientTrace {
var (
begin = time.Now()
elapsed time.Duration
)
return &httptrace.ClientTrace{
ConnectDone: func(network, addr string, err error) {
elapsed = time.Since(begin)
begin = time.Now()
r.Trace.ConnectionTime = elapsed.Seconds() * 1e3
},
GotFirstResponseByte: func() {
elapsed = time.Since(begin)
begin = time.Now()
r.Trace.TimeToFirstByte = elapsed.Seconds() * 1e3
},
}
}
func calcStats(c map[int]float64, s []float64) map[string]float64 {
var r = make(map[string]float64, 5)
// total replied requests
for k, v := range c {
if k < 0 {
continue
}
r["sum"] += v
}
for _, v := range s {
// maximum
if r["max"] < v {
r["max"] = v
}
// minimum
if r["min"] > v || r["min"] == 0 {
r["min"] = v
}
// average
if r["avg"] == 0 {
r["avg"] = v
} else {
r["avg"] = (r["avg"] + v) / 2
}
}
return r
}
func muteStdout() {
stdout = os.Stdout
_, w, _ := os.Pipe()
os.Stdout = w
}
func unMuteStdout() {
os.Stdout = stdout
}
// help shows ping help
func help(cfg cli.Config) {
fmt.Printf(`
usage:
hping url [options]
options:
-c count Send 'count' requests (default: %d)
-t timeout Set a time limit for requests in ms/s (default: %s)
-i interval Set a wait time between sending each request in ms/s (default: %s)
-m method HTTP methods: GET/POST/HEAD (default: %s)
-d data Sending the given data (text/json) (default: "%s")
-u user agent Set user agent
-4 Force IPv4
-6 Force IPv6
-q Quiet reqular output
-k Enable keep alive
-dc Disable compression
-nc Don’t check the server certificate
-trace Provides the events within client requests
-json Export statistics as json format
Proxy:
hping parses environment variables HTTP(S)_PROXY to determine which/if any
proxies should be used.
`,
cfg.Hping.Count,
cfg.Hping.Timeout,
cfg.Hping.Interval,
cfg.Hping.Method,
cfg.Hping.Data)
}