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// 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 zapcore
import "go.uber.org/multierr"
type multiCore []Core
// NewTee creates a Core that duplicates log entries into two or more
// underlying Cores.
//
// Calling it with a single Core returns the input unchanged, and calling
// it with no input returns a no-op Core.
func NewTee(cores ...Core) Core {
switch len(cores) {
case 0:
return NewNopCore()
case 1:
return cores[0]
default:
return multiCore(cores)
}
}
func (mc multiCore) With(fields []Field) Core {
clone := make(multiCore, len(mc))
for i := range mc {
clone[i] = mc[i].With(fields)
}
return clone
}
func (mc multiCore) Enabled(lvl Level) bool {
for i := range mc {
if mc[i].Enabled(lvl) {
return true
}
}
return false
}
func (mc multiCore) Check(ent Entry, ce *CheckedEntry) *CheckedEntry {
for i := range mc {
ce = mc[i].Check(ent, ce)
}
return ce
}
func (mc multiCore) Write(ent Entry, fields []Field) error {
var err error
for i := range mc {
err = multierr.Append(err, mc[i].Write(ent, fields))
}
return err
}
func (mc multiCore) Sync() error {
var err error
for i := range mc {
err = multierr.Append(err, mc[i].Sync())
}
return err
}
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