82 lines
2.4 KiB
Go
82 lines
2.4 KiB
Go
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// Copyright (c) 2016 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package zap
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"go.uber.org/zap/zapcore"
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)
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// ServeHTTP is a simple JSON endpoint that can report on or change the current
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// logging level.
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//
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// GET requests return a JSON description of the current logging level. PUT
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// requests change the logging level and expect a payload like:
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// {"level":"info"}
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//
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// It's perfectly safe to change the logging level while a program is running.
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func (lvl AtomicLevel) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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type errorResponse struct {
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Error string `json:"error"`
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}
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type payload struct {
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Level *zapcore.Level `json:"level"`
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}
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enc := json.NewEncoder(w)
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switch r.Method {
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case http.MethodGet:
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current := lvl.Level()
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enc.Encode(payload{Level: ¤t})
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case http.MethodPut:
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var req payload
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if errmess := func() string {
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if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
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return fmt.Sprintf("Request body must be well-formed JSON: %v", err)
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}
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if req.Level == nil {
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return "Must specify a logging level."
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}
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return ""
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}(); errmess != "" {
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w.WriteHeader(http.StatusBadRequest)
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enc.Encode(errorResponse{Error: errmess})
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return
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}
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lvl.SetLevel(*req.Level)
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enc.Encode(req)
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default:
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w.WriteHeader(http.StatusMethodNotAllowed)
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enc.Encode(errorResponse{
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Error: "Only GET and PUT are supported.",
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})
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}
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}
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