[VOL-4638] Initial commit
Change-Id: I5e785d017e1d27783b24591b52f20f442895e602
diff --git a/vendor/go.uber.org/zap/http_handler.go b/vendor/go.uber.org/zap/http_handler.go
new file mode 100644
index 0000000..1297c33
--- /dev/null
+++ b/vendor/go.uber.org/zap/http_handler.go
@@ -0,0 +1,132 @@
+// Copyright (c) 2016 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package zap
+
+import (
+ "encoding/json"
+ "fmt"
+ "io"
+ "net/http"
+
+ "go.uber.org/zap/zapcore"
+)
+
+// ServeHTTP is a simple JSON endpoint that can report on or change the current
+// logging level.
+//
+// GET
+//
+// The GET request returns a JSON description of the current logging level like:
+// {"level":"info"}
+//
+// PUT
+//
+// The PUT request changes the logging level. It is perfectly safe to change the
+// logging level while a program is running. Two content types are supported:
+//
+// Content-Type: application/x-www-form-urlencoded
+//
+// With this content type, the level can be provided through the request body or
+// a query parameter. The log level is URL encoded like:
+//
+// level=debug
+//
+// The request body takes precedence over the query parameter, if both are
+// specified.
+//
+// This content type is the default for a curl PUT request. Following are two
+// example curl requests that both set the logging level to debug.
+//
+// curl -X PUT localhost:8080/log/level?level=debug
+// curl -X PUT localhost:8080/log/level -d level=debug
+//
+// For any other content type, the payload is expected to be JSON encoded and
+// look like:
+//
+// {"level":"info"}
+//
+// An example curl request could look like this:
+//
+// curl -X PUT localhost:8080/log/level -H "Content-Type: application/json" -d '{"level":"debug"}'
+//
+func (lvl AtomicLevel) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+ type errorResponse struct {
+ Error string `json:"error"`
+ }
+ type payload struct {
+ Level zapcore.Level `json:"level"`
+ }
+
+ enc := json.NewEncoder(w)
+
+ switch r.Method {
+ case http.MethodGet:
+ enc.Encode(payload{Level: lvl.Level()})
+ case http.MethodPut:
+ requestedLvl, err := decodePutRequest(r.Header.Get("Content-Type"), r)
+ if err != nil {
+ w.WriteHeader(http.StatusBadRequest)
+ enc.Encode(errorResponse{Error: err.Error()})
+ return
+ }
+ lvl.SetLevel(requestedLvl)
+ enc.Encode(payload{Level: lvl.Level()})
+ default:
+ w.WriteHeader(http.StatusMethodNotAllowed)
+ enc.Encode(errorResponse{
+ Error: "Only GET and PUT are supported.",
+ })
+ }
+}
+
+// Decodes incoming PUT requests and returns the requested logging level.
+func decodePutRequest(contentType string, r *http.Request) (zapcore.Level, error) {
+ if contentType == "application/x-www-form-urlencoded" {
+ return decodePutURL(r)
+ }
+ return decodePutJSON(r.Body)
+}
+
+func decodePutURL(r *http.Request) (zapcore.Level, error) {
+ lvl := r.FormValue("level")
+ if lvl == "" {
+ return 0, fmt.Errorf("must specify logging level")
+ }
+ var l zapcore.Level
+ if err := l.UnmarshalText([]byte(lvl)); err != nil {
+ return 0, err
+ }
+ return l, nil
+}
+
+func decodePutJSON(body io.Reader) (zapcore.Level, error) {
+ var pld struct {
+ Level *zapcore.Level `json:"level"`
+ }
+ if err := json.NewDecoder(body).Decode(&pld); err != nil {
+ return 0, fmt.Errorf("malformed request body: %v", err)
+ }
+ if pld.Level == nil {
+ return 0, fmt.Errorf("must specify logging level")
+ }
+ return *pld.Level, nil
+
+}