// NewStdClient returns a new standard client that uses the provided HTTP
// client to do HTTP requests. cacheSize specifies the maxmium size(in
// bytes) of the HTTP cache pool. If cacheSize <= 0, HTTP caching will be
// disabled.
func NewStdClient(client *http.Client, cacheSize int) *StdClient {
if client == nil {
client = DefaultHTTPClient
}
c := &StdClient{client: client}
if cacheSize > 0 {
c.cache = cache.NewPool(cacheSize)
}
return c
}
func TestClientCache(t *testing.T) {
assert := assert.New(t)
checkErr := func(err error) {
if err != nil {
t.Error(err)
t.FailNow()
}
}
client := &StdClient{
client: &http.Client{},
cache: cache.NewPool(1 << 20),
}
magic := "00000"
count := 0
notModified := 0
mux := http.NewServeMux()
mux.Handle("/normal", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
count++
if etag := r.Header.Get("If-None-Match"); etag == magic {
notModified++
w.WriteHeader(http.StatusNotModified)
return
}
w.Header().Set("Cache-Control", "max-age=1")
w.Header().Set("ETag", magic)
fmt.Fprint(w, magic)
}))
mux.Handle("/revalidate", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
count++
if etag := r.Header.Get("If-None-Match"); etag == magic {
notModified++
w.WriteHeader(http.StatusNotModified)
return
}
w.Header().Set("Cache-Control", "no-cache")
w.Header().Set("ETag", magic)
fmt.Fprint(w, magic)
}))
ts := httptest.NewServer(mux)
var cnt int
var notMod int
f := func(u string, content string, server bool, nomod bool) {
hreq, err := http.NewRequest("GET", ts.URL+u, nil)
checkErr(err)
req := &Request{
Request: hreq,
}
r, err := client.Do(req)
checkErr(err)
b, _ := ioutil.ReadAll(r.Body)
assert.Equal(content, string(b))
if server {
cnt++
if nomod {
notMod++
}
}
assert.Equal(count, cnt)
assert.Equal(notModified, notMod)
}
f("/normal", magic, true, false)
f("/normal", magic, false, false) // should access cache rather than server
f("/revalidate", magic, true, false)
f("/revalidate", magic, true, true)
time.Sleep(500 * time.Millisecond)
magic = "22222"
f("/normal", "00000", false, false)
f("/revalidate", magic, true, false)
time.Sleep(500 * time.Millisecond)
f("/normal", magic, true, false)
f("/normal", magic, false, false)
f("/revalidate", magic, true, true)
f("/revalidate", magic, true, true)
}