forked from mirrors/pronouns.cc
74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
package server
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import (
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"fmt"
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"net/http"
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"github.com/go-chi/render"
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"gitlab.com/1f320/pronouns/backend/log"
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)
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// WrapHandler wraps a modified http.HandlerFunc into a stdlib-compatible one.
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// The inner HandlerFunc additionally returns an error.
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func WrapHandler(hn func(w http.ResponseWriter, r *http.Request) error) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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err := hn(w, r)
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if err != nil {
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// if the function returned an API error, just render that verbatim
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// we can assume that it also logged the error (if that was needed)
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if apiErr, ok := err.(APIError); ok {
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apiErr.prepare()
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render.Status(r, apiErr.Status)
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render.JSON(w, r, apiErr)
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return
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}
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// otherwise, we log the error and return an internal server error message
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log.Errorf("error in http handler: %v", err)
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apiErr := APIError{Code: ErrInternalServerError}
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apiErr.prepare()
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render.Status(r, apiErr.Status)
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render.JSON(w, r, apiErr)
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}
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}
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}
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// APIError is an object returned by the API when an error occurs.
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// It implements the error interface and can be returned by handlers.
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type APIError struct {
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Code int `json:"code"`
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Message string `json:"message,omitempty"`
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// Status is
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Status int `json:"-"`
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}
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func (e APIError) Error() string {
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return fmt.Sprintf("%s (code: %d)", e.Message, e.Code)
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}
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func (e *APIError) prepare() {
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if e.Status == 0 {
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e.Status = errCodeStatuses[e.Code]
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}
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if e.Message == "" {
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e.Message = errCodeMessages[e.Code]
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}
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}
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// Error code constants
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const (
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ErrInternalServerError = 500 // catch-all code for unknown errors
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)
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var errCodeMessages = map[int]string{
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ErrInternalServerError: "Internal server error",
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}
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var errCodeStatuses = map[int]int{
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ErrInternalServerError: http.StatusInternalServerError,
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}
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