英文:
Using protobuf with golang and handling []byte HTTP response body
问题
我正在使用Golang的protobuf包，并尝试编写一些测试来确保我的API正常工作。
我在服务器端使用生成的.pb.go文件构建一个对象。
然后用以下代码返回它：
data, err := proto.Marshal(p)
fmt.Fprint(w, data)
在我的测试中，我这样做：
func TestGetProduct(t *testing.T) {
log.Println("Starting server")
go startAPITestServer()
time.Sleep(0 * time.Second)
log.Println("Server started")
//rq, err := http.NewRequest("GET", "localhost:8181/product/1", nil)
client := &http.Client{}
log.Println("Starting Request")
resp, err := client.Get("http://localhost:8181/product/1")
log.Println("Finished Request")
if err != nil {
t.Log(err)
}
defer resp.Body.Close()
log.Println("Reading Request")
data, err := ioutil.ReadAll(resp.Body)
log.Println("Reading finished")
if err != nil {
t.Log(err)
}
log.Println("HTTP Resp", data)
p := &Product{}
proto.UnmarshalText(string(data), p)
proto.Unmarshal(data, p2)
}
问题是，HTTP请求是正确的，并且正确显示了[]byte，但是如果我使用ioutil.ReadAll，它会将HTTP响应解释为字符串并将其转换为[]byte。
例如，响应是
[12 3 2 14 41]
然后ioutil.ReadAll将其解释为字符串而不是[]byte。
英文:
I am using the Golang protobuf package and try to write some tests to ensure my API works properly.
I construct an Object on the server-side with a generated .pb.go file.
And return it with
data, err := proto.Marshal(p)
fmt.Fprint(w, data)
And in my test I do
func TestGetProduct(t *testing.T) {
log.Println("Starting server")
go startAPITestServer()
time.Sleep(0 * time.Second)
log.Println("Server started")
//rq, err := http.NewRequest("GET", "localhost:8181/product/1", nil)
client := &http.Client{}
log.Println("Starting Request")
resp, err := client.Get("http://localhost:8181/product/1")
log.Println("Finished Request")
if err != nil {
t.Log(err)
}
defer resp.Body.Close()
log.Println("Reading Request")
data, err := ioutil.ReadAll(resp.Body)
log.Println("Reading finished")
if err != nil {
t.Log(err)
}
log.Println("HTTP Resp", data)
p := &Product{}
proto.UnmarshalText(string(data), p)
proto.Unmarshal(data, p2)
}
The Problem is that the HTTP Request is correct and displays the []byte correctly, but if I do ioutil.ReadAll it interprets the HTTP Response as a string and converts it to a []byte.
For example the response is
[12 3 2 14 41]
Then ioutil.ReadAll interprets this as a string and not as a []byte.
答案1
得分: 5
问题是：我尝试使用fmt.Fprint将二进制数据写入输出流，但忽略了一个重要事实，即fmt包会将输入（所有内容？）转换为“可读取”的格式（即字符串）。
将数据写入HTTP响应的正确方法是直接使用responsewriter，像这样：
k, err := w.Write(data)
英文:
The problem was: I tried to write binary data to the output stream with fmt.Fprint missing the important fact, that the fmt package converts (everything?) input to a "read-able" format (ie strings).
The correct way of writting data into the output of your HTTP Response is using the responsewriter directly like this:
k, err := w.Write(data)
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