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76 lines
2.5 KiB
76 lines
2.5 KiB
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package httputil
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import (
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"fmt"
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"log"
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"net/http"
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)
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const (
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// LogAccess is for logging access messages. Form: Access r.Method, r.URL
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LogAccess = "Access: %s %s"
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// LogNotFound is for logging 404 errors. Form: Not Found r.Method, r.URL
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LogNotFound = "Not Found: %s %s"
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// LogFatal is for logging 500 errors. Form: Internal Server Error r.Method r.URL message
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LogFatal = "Internal Server Error: %s %s %s"
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// LogBadRequest logs 400 errors.
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LogBadRequest = "Bad Request: %s %s %s"
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)
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// Error represents an HTTP error that can be converted to structured types.
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//
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// For example, and error can be serialized to JSON or YAML. Likewise, the
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// string marshal can convert it to a string.
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type Error struct {
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Msg string `json:"message, omitempty"`
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Status string `json:"status"`
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}
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// Error implements the error interface.
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func (e *Error) Error() string {
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return fmt.Sprintf("%s: %s", e.Status, e.Msg)
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}
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// NotFound writes a 404 error to the client and logs an error.
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func NotFound(w http.ResponseWriter, r *http.Request) {
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msg := fmt.Sprintf(LogNotFound, r.Method, r.URL)
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log.Println(msg)
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writeErr(w, r, msg, http.StatusNotFound)
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}
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// BadRequest writes an HTTP 400.
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func BadRequest(w http.ResponseWriter, r *http.Request, err error) {
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log.Printf(LogBadRequest, r.Method, r.URL, err)
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writeErr(w, r, err.Error(), http.StatusBadRequest)
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}
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// writeErr formats and writes the error using the default encoder.
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func writeErr(w http.ResponseWriter, r *http.Request, msg string, status int) {
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DefaultEncoder.Encode(w, r, &Error{Status: http.StatusText(status), Msg: msg}, status)
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}
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// Fatal writes a 500 response to the client and logs the message.
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//
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// Additional arguments are past into the the formatter as params to msg.
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func Fatal(w http.ResponseWriter, r *http.Request, msg string, v ...interface{}) {
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m := fmt.Sprintf(msg, v...)
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log.Printf(LogFatal, r.Method, r.URL, m)
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writeErr(w, r, m, http.StatusInternalServerError)
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}
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