[VOL-2312] Logging - Integrate voltctl with new etcd-based dynamic loglevel mechanism. Testing is in progress
Change-Id: I2e13bb79008c9a49ebb6f58e575f51efebe6dbfd
diff --git a/vendor/go.uber.org/zap/global.go b/vendor/go.uber.org/zap/global.go
new file mode 100644
index 0000000..c1ac050
--- /dev/null
+++ b/vendor/go.uber.org/zap/global.go
@@ -0,0 +1,168 @@
+// 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 (
+ "bytes"
+ "fmt"
+ "log"
+ "os"
+ "sync"
+
+ "go.uber.org/zap/zapcore"
+)
+
+const (
+ _loggerWriterDepth = 2
+ _programmerErrorTemplate = "You've found a bug in zap! Please file a bug at " +
+ "https://github.com/uber-go/zap/issues/new and reference this error: %v"
+)
+
+var (
+ _globalMu sync.RWMutex
+ _globalL = NewNop()
+ _globalS = _globalL.Sugar()
+)
+
+// L returns the global Logger, which can be reconfigured with ReplaceGlobals.
+// It's safe for concurrent use.
+func L() *Logger {
+ _globalMu.RLock()
+ l := _globalL
+ _globalMu.RUnlock()
+ return l
+}
+
+// S returns the global SugaredLogger, which can be reconfigured with
+// ReplaceGlobals. It's safe for concurrent use.
+func S() *SugaredLogger {
+ _globalMu.RLock()
+ s := _globalS
+ _globalMu.RUnlock()
+ return s
+}
+
+// ReplaceGlobals replaces the global Logger and SugaredLogger, and returns a
+// function to restore the original values. It's safe for concurrent use.
+func ReplaceGlobals(logger *Logger) func() {
+ _globalMu.Lock()
+ prev := _globalL
+ _globalL = logger
+ _globalS = logger.Sugar()
+ _globalMu.Unlock()
+ return func() { ReplaceGlobals(prev) }
+}
+
+// NewStdLog returns a *log.Logger which writes to the supplied zap Logger at
+// InfoLevel. To redirect the standard library's package-global logging
+// functions, use RedirectStdLog instead.
+func NewStdLog(l *Logger) *log.Logger {
+ logger := l.WithOptions(AddCallerSkip(_stdLogDefaultDepth + _loggerWriterDepth))
+ f := logger.Info
+ return log.New(&loggerWriter{f}, "" /* prefix */, 0 /* flags */)
+}
+
+// NewStdLogAt returns *log.Logger which writes to supplied zap logger at
+// required level.
+func NewStdLogAt(l *Logger, level zapcore.Level) (*log.Logger, error) {
+ logger := l.WithOptions(AddCallerSkip(_stdLogDefaultDepth + _loggerWriterDepth))
+ logFunc, err := levelToFunc(logger, level)
+ if err != nil {
+ return nil, err
+ }
+ return log.New(&loggerWriter{logFunc}, "" /* prefix */, 0 /* flags */), nil
+}
+
+// RedirectStdLog redirects output from the standard library's package-global
+// logger to the supplied logger at InfoLevel. Since zap already handles caller
+// annotations, timestamps, etc., it automatically disables the standard
+// library's annotations and prefixing.
+//
+// It returns a function to restore the original prefix and flags and reset the
+// standard library's output to os.Stderr.
+func RedirectStdLog(l *Logger) func() {
+ f, err := redirectStdLogAt(l, InfoLevel)
+ if err != nil {
+ // Can't get here, since passing InfoLevel to redirectStdLogAt always
+ // works.
+ panic(fmt.Sprintf(_programmerErrorTemplate, err))
+ }
+ return f
+}
+
+// RedirectStdLogAt redirects output from the standard library's package-global
+// logger to the supplied logger at the specified level. Since zap already
+// handles caller annotations, timestamps, etc., it automatically disables the
+// standard library's annotations and prefixing.
+//
+// It returns a function to restore the original prefix and flags and reset the
+// standard library's output to os.Stderr.
+func RedirectStdLogAt(l *Logger, level zapcore.Level) (func(), error) {
+ return redirectStdLogAt(l, level)
+}
+
+func redirectStdLogAt(l *Logger, level zapcore.Level) (func(), error) {
+ flags := log.Flags()
+ prefix := log.Prefix()
+ log.SetFlags(0)
+ log.SetPrefix("")
+ logger := l.WithOptions(AddCallerSkip(_stdLogDefaultDepth + _loggerWriterDepth))
+ logFunc, err := levelToFunc(logger, level)
+ if err != nil {
+ return nil, err
+ }
+ log.SetOutput(&loggerWriter{logFunc})
+ return func() {
+ log.SetFlags(flags)
+ log.SetPrefix(prefix)
+ log.SetOutput(os.Stderr)
+ }, nil
+}
+
+func levelToFunc(logger *Logger, lvl zapcore.Level) (func(string, ...Field), error) {
+ switch lvl {
+ case DebugLevel:
+ return logger.Debug, nil
+ case InfoLevel:
+ return logger.Info, nil
+ case WarnLevel:
+ return logger.Warn, nil
+ case ErrorLevel:
+ return logger.Error, nil
+ case DPanicLevel:
+ return logger.DPanic, nil
+ case PanicLevel:
+ return logger.Panic, nil
+ case FatalLevel:
+ return logger.Fatal, nil
+ }
+ return nil, fmt.Errorf("unrecognized level: %q", lvl)
+}
+
+type loggerWriter struct {
+ logFunc func(msg string, fields ...Field)
+}
+
+func (l *loggerWriter) Write(p []byte) (int, error) {
+ p = bytes.TrimSpace(p)
+ l.logFunc(string(p))
+ return len(p), nil
+}