94 lines
2.1 KiB
Go
94 lines
2.1 KiB
Go
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package muxtool
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import (
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"context"
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"encoding/json"
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"net/http"
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)
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// Wrap API handler and returns standard http.HandlerFunc function
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func Wrap[RQ any, RS any](handler func(ctx context.Context, request *RQ) (RS, error)) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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req := new(RQ)
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richifyRequest(req, r)
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switch r.Method {
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case http.MethodPost, http.MethodPatch, http.MethodDelete, http.MethodPut:
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if err := json.NewDecoder(r.Body).Decode(req); err != nil {
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w.WriteHeader(http.StatusBadRequest)
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_, _ = w.Write([]byte(err.Error()))
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return
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}
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}
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resp, err := handler(r.Context(), req)
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if err != nil {
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w.WriteHeader(http.StatusInternalServerError)
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_, _ = w.Write([]byte(err.Error()))
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return
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}
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statusCode := http.StatusOK
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contentType := "application/json"
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var body []byte
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if v, ok := (any)(resp).(WithContentType); ok {
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contentType = v.ContentType()
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}
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if v, ok := (any)(resp).(WithHTTPStatus); ok {
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statusCode = v.Status()
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}
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if v, ok := (any)(resp).(Renderer); ok {
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body, err = v.Render()
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} else {
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body, err = json.Marshal(resp)
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}
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if err != nil {
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w.WriteHeader(http.StatusInternalServerError)
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_, _ = w.Write([]byte(err.Error()))
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return
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}
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w.WriteHeader(statusCode)
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w.Header().Set("Content-Type", contentType)
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w.Write(body)
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}
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}
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func richifyRequest[RQ any](req *RQ, baseRequest *http.Request) {
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if v, ok := (any)(req).(WithHeader); ok {
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v.WithHeader(baseRequest.Header)
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}
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if v, ok := (any)(req).(WithMethod); ok {
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v.WithMethod(baseRequest.Method)
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}
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}
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type NilRequest struct{}
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// Optional interfaces for request type
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// WithHeader sets headers to request
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type WithHeader interface {
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WithHeader(header http.Header)
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}
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// WithMethod sets method to request
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type WithMethod interface {
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WithMethod(method string)
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}
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// Optional interfaces for response type
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// Renderer renders response to byte slice
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type Renderer interface {
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Render() ([]byte, error)
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}
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// WithContentType returns custom content type for response
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type WithContentType interface {
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ContentType() string
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}
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// WithHTTPStatus returns custom status code
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type WithHTTPStatus interface {
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Status() int
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}
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