问题描述
我是Go的新手,但到目前为止,我非常喜欢它。
我有个问题,我找不出来。我正在将一个API从Node迁移到Go,并且存在这个日志,我必须捕获POST正文 原样 并将其保存到
TIL http.Response.Body 是一个缓冲区,这意味着一旦它被读取,它就不能被再次读取。
它就像一股水流,你可以看到它并在它经过时测量它,但是一次它已经消失了,它已经消失了。
然而,知道这一点,有一个解决方法,你需要抓住主体并恢复它:
//读取正文内容
var bodyBytes [] byte
if context.Request()。Body!= nil {
bodyBytes,_ = ioutil.ReadAll(context.Request()。Body)
}
//将io.ReadCloser恢复到原始状态
context.Request( ).Body = ioutil.NopCloser(bytes.NewBuffer(bodyBytes))
//继续使用Body,如将它绑定到一个结构体:
order:= new(models.GeaOrder )
error:= context.Bind(order)
现在,您可以使用 context.Request()。Body 其他地方。
S资源:
I'm a newbie with Go, but so far I'm liking it very much.
I have a problem I can't figure out. I'm migrating an API from Node to Go and there is this log where I have to capture the Body of a POST AS IT IS and save it to a jsonb type column in a Postgresql database.
This means I can't use a struct or anything predetermined.
The POST is made with body raw Content-Type: application/json like so:
{ "debug": false, "order_id_gea": 326064, "increment_id_gea": 200436102, "date": "2017-05-18T01:44:44+00:00", "total_amount": 10000.00, "currency": "MXN", "payment_method": "Referencia bancaria", "reference": "857374", "buyer": { "buyer_id_gea": 1234, "full_name": "Juan Perez Martinez", "email": "juanperez@gmail.com", "phone": "5512341234" }, "products": [ { "sku":"PEP16114", "price": 10000.00, "currency": "MXN", "student": { "school_id_gea": 172, "grade_id_gea": 119, "level_id_gea": 36, "name": "Benancio", "last_name": "Perez", "second_last_name": "Garcia", "email": "benancio@gmail.com" } } ] }
On Node + Hapi is quite simple:
const payload = request.payload
and then I can access the JSON from payload.
I am using Go with Echo, so context is a wrapper where I can find Request() *http.Request.
I have tried the following, but everytime the result is empty or an error because it is empty:
var v interface{} err := json.NewDecoder(context.Request().Body).Decode(&v) if err != nil { return result, err } fmt.Println(v)
Result: EOF
--
m := echo.Map{} if err := context.Bind(&m); err != nil { return result, err } fmt.Println(m)
Result code 400, message EOF
--
body, error := ioutil.ReadAll(context.Request().Body) if error != nil { return result, error } fmt.Println(body)
Result []
--
What am I missing and/or doing wrong? Thanks!
TIL that http.Response.Body is a buffer, which means that once it has been read, it cannot be read again.
It's like a stream of water, you can see it and measure it as it passes but once it's gone, it's gone.
However, knowing this, there is a workaround, you need to "catch" the body and restore it:
// Read the Body content var bodyBytes []byte if context.Request().Body != nil { bodyBytes, _ = ioutil.ReadAll(context.Request().Body) } // Restore the io.ReadCloser to its original state context.Request().Body = ioutil.NopCloser(bytes.NewBuffer(bodyBytes)) // Continue to use the Body, like Binding it to a struct: order := new(models.GeaOrder) error := context.Bind(order)
Now, you can use context.Request().Body somewhere else.
Sources:
http://grokbase.com/t/gg/golang-nuts/12adq8a2ys/go-nuts-re-reading-http-response-body-or-any-reader
https://medium.com/@xoen/golang-read-from-an-io-readwriter-without-loosing-its-content-2c6911805361
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