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response.go
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/
response.go
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package web
import (
"bytes"
"encoding/json"
"errors"
"net/http"
"github.com/ReanSn0w/tk4go/pkg/tools"
)
var (
errFailedToEncodeResponse = errors.New("failed to encode response")
)
// NewResponse creates a new response
func NewResponse[T any](data T) *Response[T] {
switch t := any(data).(type) {
case tools.ErrorsMap:
return &Response[T]{
Success: false,
Data: data,
}
case error:
return &Response[T]{
Success: false,
Message: t.Error(),
}
default:
return &Response[T]{
Success: true,
Data: data,
}
}
}
// Response is a generic response structure
type (
Response[T any] struct {
Success bool `json:"success"`
Message string `json:"message,omitempty"`
Data T `json:"data,omitempty"`
}
isError interface {
IsError() error
}
)
// Write writes the response to the writer
func (r *Response[T]) Write(code int, wr http.ResponseWriter) {
buf := new(bytes.Buffer)
enc := json.NewEncoder(buf)
err := enc.Encode(r)
if err != nil {
if r.Message != errFailedToEncodeResponse.Error() {
NewResponse(errFailedToEncodeResponse).
Write(http.StatusInternalServerError, wr)
}
return
}
wr.Header().Set("Content-Type", "application/json")
wr.WriteHeader(code)
buf.WriteTo(wr)
}
func (r *Response[T]) isError() error {
isErrorData, ok := any(r.Data).(isError)
if ok {
return isErrorData.IsError()
}
if len(r.Message) > 0 {
return errors.New("response errors: " + r.Message)
}
return errors.New("unknown response error")
}