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Go JSON Decoder Access Size With Custom Reader
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| type LengthReader struct { | |
| io.Reader | |
| Length int | |
| } | |
| func (cw *LengthReader) Read(p []byte) (n int, err error) { | |
| n, err = cw.Reader.Read(p) | |
| cw.Length += n | |
| return n, err | |
| } | |
| v := interface{} | |
| lr := &LengthReader{Reader: r.Body} | |
| decoder := json.NewDecoder(lr).Decode(&v) | |
| fmt.Printf("The size of the payload is %d \n", lr.Length) |
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