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extract.go
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extract.go
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package tenuki
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"sync"
"testing"
)
type ExtractFacade struct {
T *testing.T
cache map[string][]byte
mu sync.Mutex
}
func (f *Facade) Extract() *ExtractFacade {
f.mu.Lock()
defer f.mu.Unlock()
if f.extractor != nil {
return f.extractor
}
f.extractor = &ExtractFacade{
T: f.T,
cache: map[string][]byte{},
}
return f.extractor
}
func (f *ExtractFacade) buffer(res *http.Response) *bytes.Buffer {
f.mu.Lock()
defer f.mu.Unlock()
k := fmt.Sprintf("%p", res) // xxx
cache := f.cache[k]
if cache != nil {
return bytes.NewBuffer(cache)
}
t := f.T
t.Helper()
var buf bytes.Buffer
if _, err := buf.ReadFrom(res.Body); err != nil {
t.Fatalf("!! buffer: %+v", err)
}
defer func() {
if err := res.Body.Close(); err != nil {
t.Fatalf("!! DecodeJSON Close: %+v", err)
}
}()
cache = buf.Bytes()
f.cache[k] = cache
return bytes.NewBuffer(cache)
}
func (f *ExtractFacade) BindJSON(res *http.Response, ob interface{}) {
t := f.T
t.Helper()
decoder := json.NewDecoder(f.buffer(res))
if err := decoder.Decode(&ob); err != nil {
t.Fatalf("!! DecodeJSON: %+v", err)
}
}
func (f *ExtractFacade) JSON(res *http.Response) interface{} {
t := f.T
t.Helper()
var ob interface{}
f.BindJSON(res, &ob)
return ob
}
func (f *ExtractFacade) Bytes(res *http.Response) []byte {
t := f.T
t.Helper()
return f.buffer(res).Bytes()
}
func (f *ExtractFacade) String(res *http.Response) string {
t := f.T
t.Helper()
return f.buffer(res).String()
}
func DecodeJSON(r io.Reader, ob interface{}) error {
defer io.Copy(ioutil.Discard, r)
return json.NewDecoder(r).Decode(ob)
}