60 lines
2.5 KiB
Go
60 lines
2.5 KiB
Go
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"net/http"
|
|
)
|
|
|
|
// The logError() method is a generic helper for logging an error message. “Later in the
|
|
// book we'll upgrade this to use structured logging, and record additional information
|
|
// about the request including the HTTP method and URL.
|
|
func (app *application) logError(r *http.Request, err error) {
|
|
app.logger.Println(err)
|
|
}
|
|
|
|
// The errorResponse() method is a generic helper for sending JSON-formatted error
|
|
// messages to the client with a given status code. Note that we're using an interface{}
|
|
// type for the message parameter, rather than just a string type, as this gives us
|
|
// more flexibility over the values that we can include in the response.
|
|
func (app *application) errorResponse(w http.ResponseWriter, r *http.Request, status int, message interface{}) {
|
|
env := envelope{"error": message}
|
|
|
|
// Write the response using the writeJSON() helper. If this happens to return an
|
|
// error then log it, and fall back to sending the client an empty response with a
|
|
// 500 Internal Server Error status code.
|
|
err := app.writeJSON(w, status, env, nil)
|
|
if err != nil {
|
|
app.logError(r, err)
|
|
w.WriteHeader(500)
|
|
}
|
|
}
|
|
|
|
// The serverErrorResponse() method will be used when our application encounters an
|
|
// unexpected problem at runtime. It logs the detailed error message, then uses the
|
|
// errorResponse() helper to send a 500 Internal Server Error status code and JSON
|
|
// response (containing a generic error message) to the client.
|
|
func (app *application) serverErrorResponse(w http.ResponseWriter, r *http.Request, err error) {
|
|
app.logError(r, err)
|
|
|
|
message := "the server encountered a problem and could not process your request"
|
|
app.errorResponse(w, r, http.StatusInternalServerError, message)
|
|
}
|
|
|
|
// The notFoundResponse() method will be used to send a 404 Not Found status code and
|
|
// JSON response to the client.
|
|
func (app *application) notFoundResponse(w http.ResponseWriter, r *http.Request) {
|
|
message := "the requested resource could not be found"
|
|
app.errorResponse(w, r, http.StatusNotFound, message)
|
|
}
|
|
|
|
// The methodNotAllowedResponse() method will be used to send a 405 Method Not Allowed
|
|
// status code and JSON response to the client.
|
|
func (app *application) methodNotAllowedResponse(w http.ResponseWriter, r *http.Request) {
|
|
message := fmt.Sprintf("the %s method is not supported for this resource", r.Method)
|
|
app.errorResponse(w, r, http.StatusMethodNotAllowed, message)
|
|
}
|
|
|
|
func (app *application) badRequestResponse(w http.ResponseWriter, r *http.Request, err error) {
|
|
app.errorResponse(w, r, http.StatusBadRequest, err.Error())
|
|
}
|