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# httpstat | ||
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Immitation is the most sincere form of flattery. | ||
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## We don't need no stinking curl | ||
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`httpstat.py` is a wrapper around `curl(1)`, which is all fine and good, but what if you don't have `curl(1)` or `python(1)` installed? |
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package main | ||
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import ( | ||
"bufio" | ||
"flag" | ||
"fmt" | ||
"io" | ||
"io/ioutil" | ||
"log" | ||
"net" | ||
"net/http" | ||
"net/url" | ||
"os" | ||
"strings" | ||
"time" | ||
) | ||
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const ( | ||
HTTPS_TEMPLATE = `` + | ||
` DNS Lookup TCP Connection SSL Handshake Server Processing Content Transfer` + | ||
`[ {a0000} | {a0001} | {a0002} | {a0003} | {a0004} ]` + | ||
` | | | | |` + | ||
` namelookup:{b0000} | | | |` + | ||
` connect:{b0001} | | |` + | ||
` pretransfer:{b0002} | |` + | ||
` starttransfer:{b0003} |` + | ||
` total:{b0004}` | ||
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HTTP_TEMPLATE = `` + | ||
` DNS Lookup TCP Connection Server Processing Content Transfer` + "\n" + | ||
`[ %7dms | %7dms | %7dms | %7dms ]` + "\n" + | ||
` | | | |` + "\n" + | ||
` namelookup:%7dms | | |` + "\n" + | ||
` connect:%7dms | |` + "\n" + | ||
` starttransfer:%7dms |` + "\n" + | ||
` total:%7dms` + "\n" | ||
) | ||
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func main() { | ||
flag.Parse() | ||
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args := flag.Args() | ||
if len(args) != 1 { | ||
log.Fatalf("usage: %s URL", os.Args[0]) | ||
} | ||
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url, err := url.Parse(args[0]) | ||
if err != nil { | ||
log.Fatalf("could not parse url %q: %v", args[0], err) | ||
} | ||
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scheme := url.Scheme | ||
hostport := url.Host | ||
host, port := func() (string, int) { | ||
switch scheme { | ||
case "https": | ||
return hostport, 443 | ||
case "http": | ||
return hostport, 80 | ||
default: | ||
log.Fatalf("unsupported url scheme %q", scheme) | ||
return "", 0 // not reached | ||
} | ||
}() | ||
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t0 := time.Now() // before dns resolution | ||
raddr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf("%s:%d", host, port)) | ||
if err != nil { | ||
log.Fatalf("unable to resolve host: %v", err) | ||
} | ||
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t1 := time.Now() // after dns resolution, before connect | ||
conn, err := net.DialTCP("tcp", nil, raddr) | ||
if err != nil { | ||
log.Fatalf("unable to connect to host %vv %v", raddr, err) | ||
} | ||
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t2 := time.Now() // after connect, before request | ||
req, err := http.NewRequest("GET", url.String(), nil) | ||
if err != nil { | ||
log.Fatalf("unable to create request: %v", err) | ||
} | ||
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if err := req.Write(conn); err != nil { | ||
log.Fatalf("failed to write request: %v", err) | ||
} | ||
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t3 := time.Now() // after request, before read response | ||
resp, err := http.ReadResponse(bufio.NewReader(conn), req) | ||
if err != nil { | ||
log.Fatalf("failed to read response: %v", err) | ||
} | ||
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t4 := time.Now() // after read request, before read body | ||
if _, err := io.Copy(ioutil.Discard, resp.Body); err != nil { | ||
log.Fatalf("failed to read response body: %v", err) | ||
} | ||
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t5 := time.Now() // after read body | ||
resp.Body.Close() | ||
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_ = t3 | ||
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// print status line and headers | ||
fmt.Println("\n", resp.Proto, resp.Status) | ||
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for k, v := range resp.Header { | ||
fmt.Println(k+":", strings.Join(v, ",")) | ||
} | ||
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fmt.Println("\nBody discarded\n") | ||
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switch scheme { | ||
case "https": | ||
case "http": | ||
fmt.Printf(HTTP_TEMPLATE, | ||
int(t1.Sub(t0)/time.Millisecond), // dns lookup | ||
int(t2.Sub(t1)/time.Millisecond), // tcp connection | ||
int(t4.Sub(t2)/time.Millisecond), // server processing | ||
int(t5.Sub(t4)/time.Millisecond), // content transfer | ||
int(t1.Sub(t0)/time.Millisecond), // namelookup | ||
int(t2.Sub(t0)/time.Millisecond), // connect | ||
int(t4.Sub(t0)/time.Millisecond), // starttransfer | ||
int(t5.Sub(t0)/time.Millisecond), // total | ||
) | ||
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} | ||
} |