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package gziphandler
import (
"bytes"
"compress/gzip"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/http/httptest"
"net/url"
"strconv"
"testing"
"github.com/stretchr/testify/assert"
)
func TestParseEncodings(t *testing.T) {
examples := map[string]codings{
// Examples from RFC 2616
"compress, gzip": {"compress": 1.0, "gzip": 1.0},
"": {},
"*": {"*": 1.0},
"compress;q=0.5, gzip;q=1.0": {"compress": 0.5, "gzip": 1.0},
"gzip;q=1.0, identity; q=0.5, *;q=0": {"gzip": 1.0, "identity": 0.5, "*": 0.0},
// More random stuff
"AAA;q=1": {"aaa": 1.0},
"BBB ; q = 2": {"bbb": 1.0},
}
for eg, exp := range examples {
act, _ := parseEncodings(eg)
assert.Equal(t, exp, act)
}
}
func TestGzipHandler(t *testing.T) {
testBody := "aaabbbccc"
// This just exists to provide something for GzipHandler to wrap.
handler := newTestHandler(testBody)
// requests without accept-encoding are passed along as-is
req1, _ := http.NewRequest("GET", "/whatever", nil)
resp1 := httptest.NewRecorder()
handler.ServeHTTP(resp1, req1)
res1 := resp1.Result()
assert.Equal(t, 200, res1.StatusCode)
assert.Equal(t, "", res1.Header.Get("Content-Encoding"))
assert.Equal(t, "Accept-Encoding", res1.Header.Get("Vary"))
assert.Equal(t, testBody, resp1.Body.String())
// but requests with accept-encoding:gzip are compressed if possible
req2, _ := http.NewRequest("GET", "/whatever", nil)
req2.Header.Set("Accept-Encoding", "gzip")
resp2 := httptest.NewRecorder()
handler.ServeHTTP(resp2, req2)
res2 := resp2.Result()
assert.Equal(t, 200, res2.StatusCode)
assert.Equal(t, "gzip", res2.Header.Get("Content-Encoding"))
assert.Equal(t, "Accept-Encoding", res2.Header.Get("Vary"))
assert.Equal(t, gzipStrLevel(testBody, gzip.DefaultCompression), resp2.Body.Bytes())
// content-type header is correctly set based on uncompressed body
req3, _ := http.NewRequest("GET", "/whatever", nil)
req3.Header.Set("Accept-Encoding", "gzip")
res3 := httptest.NewRecorder()
handler.ServeHTTP(res3, req3)
assert.Equal(t, http.DetectContentType([]byte(testBody)), res3.Header().Get("Content-Type"))
}
func TestNewGzipLevelHandler(t *testing.T) {
testBody := "aaabbbccc"
handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
io.WriteString(w, testBody)
})
for lvl := gzip.BestSpeed; lvl <= gzip.BestCompression; lvl++ {
wrapper, err := NewGzipLevelHandler(lvl)
if !assert.Nil(t, err, "NewGzipLevleHandler returned error for level:", lvl) {
continue
}
req, _ := http.NewRequest("GET", "/whatever", nil)
req.Header.Set("Accept-Encoding", "gzip")
resp := httptest.NewRecorder()
wrapper(handler).ServeHTTP(resp, req)
res := resp.Result()
assert.Equal(t, 200, res.StatusCode)
assert.Equal(t, "gzip", res.Header.Get("Content-Encoding"))
assert.Equal(t, "Accept-Encoding", res.Header.Get("Vary"))
assert.Equal(t, gzipStrLevel(testBody, lvl), resp.Body.Bytes())
}
}
func TestNewGzipLevelHandlerReturnsErrorForInvalidLevels(t *testing.T) {
var err error
_, err = NewGzipLevelHandler(-42)
assert.NotNil(t, err)
_, err = NewGzipLevelHandler(42)
assert.NotNil(t, err)
}
func TestMustNewGzipLevelHandlerWillPanic(t *testing.T) {
defer func() {
if r := recover(); r == nil {
t.Error("panic was not called")
}
}()
_ = MustNewGzipLevelHandler(-42)
}
func TestGzipHandlerNoBody(t *testing.T) {
tests := []struct {
statusCode int
contentEncoding string
bodyLen int
}{
// Body must be empty.
{http.StatusNoContent, "", 0},
{http.StatusNotModified, "", 0},
// Body is going to get gzip'd no matter what.
{http.StatusOK, "gzip", 23},
}
for num, test := range tests {
handler := GzipHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(test.statusCode)
}))
rec := httptest.NewRecorder()
// TODO: in Go1.7 httptest.NewRequest was introduced this should be used
// once 1.6 is not longer supported.
req := &http.Request{
Method: "GET",
URL: &url.URL{Path: "/"},
Proto: "HTTP/1.1",
ProtoMinor: 1,
RemoteAddr: "192.0.2.1:1234",
Header: make(http.Header),
}
req.Header.Set("Accept-Encoding", "gzip")
handler.ServeHTTP(rec, req)
body, err := ioutil.ReadAll(rec.Body)
if err != nil {
t.Fatalf("Unexpected error reading response body: %v", err)
}
header := rec.Header()
assert.Equal(t, test.contentEncoding, header.Get("Content-Encoding"), fmt.Sprintf("for test iteration %d", num))
assert.Equal(t, "Accept-Encoding", header.Get("Vary"), fmt.Sprintf("for test iteration %d", num))
assert.Equal(t, test.bodyLen, len(body), fmt.Sprintf("for test iteration %d", num))
}
}
func TestGzipHandlerContentLength(t *testing.T) {
b := []byte("testtesttesttesttesttesttesttesttesttesttesttesttest")
handler := GzipHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Length", strconv.Itoa(len(b)))
w.Write(b)
}))
// httptest.NewRecorder doesn't give you access to the Content-Length
// header so instead, we create a server on a random port and make
// a request to that instead
ln, err := net.Listen("tcp", "127.0.0.1:")
if err != nil {
t.Fatalf("failed creating listen socket: %v", err)
}
defer ln.Close()
srv := &http.Server{
Handler: handler,
}
go srv.Serve(ln)
req := &http.Request{
Method: "GET",
URL: &url.URL{Path: "/", Scheme: "http", Host: ln.Addr().String()},
Header: make(http.Header),
Close: true,
}
req.Header.Set("Accept-Encoding", "gzip")
res, err := http.DefaultClient.Do(req)
if err != nil {
t.Fatalf("Unexpected error making http request: %v", err)
}
defer res.Body.Close()
body, err := ioutil.ReadAll(res.Body)
if err != nil {
t.Fatalf("Unexpected error reading response body: %v", err)
}
l, err := strconv.Atoi(res.Header.Get("Content-Length"))
if err != nil {
t.Fatalf("Unexpected error parsing Content-Length: %v", err)
}
assert.Len(t, body, l)
assert.Equal(t, "gzip", res.Header.Get("Content-Encoding"))
assert.NotEqual(t, b, body)
}
// --------------------------------------------------------------------
func BenchmarkGzipHandler_S2k(b *testing.B) { benchmark(b, false, 2048) }
func BenchmarkGzipHandler_S20k(b *testing.B) { benchmark(b, false, 20480) }
func BenchmarkGzipHandler_S100k(b *testing.B) { benchmark(b, false, 102400) }
func BenchmarkGzipHandler_P2k(b *testing.B) { benchmark(b, true, 2048) }
func BenchmarkGzipHandler_P20k(b *testing.B) { benchmark(b, true, 20480) }
func BenchmarkGzipHandler_P100k(b *testing.B) { benchmark(b, true, 102400) }
// --------------------------------------------------------------------
func gzipStrLevel(s string, lvl int) []byte {
var b bytes.Buffer
w, _ := gzip.NewWriterLevel(&b, lvl)
io.WriteString(w, s)
w.Close()
return b.Bytes()
}
func benchmark(b *testing.B, parallel bool, size int) {
bin, err := ioutil.ReadFile("testdata/benchmark.json")
if err != nil {
b.Fatal(err)
}
req, _ := http.NewRequest("GET", "/whatever", nil)
req.Header.Set("Accept-Encoding", "gzip")
handler := newTestHandler(string(bin[:size]))
if parallel {
b.ResetTimer()
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
runBenchmark(b, req, handler)
}
})
} else {
b.ResetTimer()
for i := 0; i < b.N; i++ {
runBenchmark(b, req, handler)
}
}
}
func runBenchmark(b *testing.B, req *http.Request, handler http.Handler) {
res := httptest.NewRecorder()
handler.ServeHTTP(res, req)
if code := res.Code; code != 200 {
b.Fatalf("Expected 200 but got %d", code)
} else if blen := res.Body.Len(); blen < 500 {
b.Fatalf("Expected complete response body, but got %d bytes", blen)
}
}
func newTestHandler(body string) http.Handler {
return GzipHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, body)
}))
}
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