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package main
import (
"fmt"
"log"
"net/http"
"runtime/debug"
)
func (app *application) serverError(w http.ResponseWriter, r *http.Request, err error) {
var (
method = r.Method
uri = r.URL.RequestURI()
trace = string(debug.Stack())
)
app.logger.Error(err.Error(), "method", method, "uri", uri, "trace", trace)
log.Printf("Crash! %s %s %s", method, uri, trace)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
// The clientError helper sends a specific status code and corresponding description
// to the user. We'll use this later in the book to send responses like 400 "Bad
// Request" when there's a problem with the request that the user sent.
func (app *application) clientError(w http.ResponseWriter, status int) {
http.Error(w, http.StatusText(status), status)
}
// notFound helper is a convenience wrapper around clientError which sends a 404 Not Found response
func (app *application) notFound(w http.ResponseWriter) {
app.clientError(w, http.StatusNotFound)
}
func (app *application) render(w http.ResponseWriter, r *http.Request, status int, page string, data templateData) {
// retrieve the appropriate template set from the cache based on the page name.
// If no entry exists in the cache with the provided name, create a new error
// and call serverError() helper that we made earlier and return.
ts, ok := app.templateCache[page]
if !ok {
err := fmt.Errorf("the template %s does not exist", page)
app.serverError(w, r, err)
return
}
// Write out the provided HTTP status code('200 OK', '400 Bad Request', etc).
w.WriteHeader(status)
err := ts.ExecuteTemplate(w, "base", data)
if err != nil {
app.serverError(w, r, err)
}
}
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