tee.go

Documentation: go.uber.org/zap/zapcore

     1  // Copyright (c) 2016-2022 Uber Technologies, Inc.
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     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
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     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package zapcore
    22  
    23  import "go.uber.org/multierr"
    24  
    25  type multiCore []Core
    26  
    27  var (
    28  	_ leveledEnabler = multiCore(nil)
    29  	_ Core           = multiCore(nil)
    30  )
    31  
    32  // NewTee creates a Core that duplicates log entries into two or more
    33  // underlying Cores.
    34  //
    35  // Calling it with a single Core returns the input unchanged, and calling
    36  // it with no input returns a no-op Core.
    37  func NewTee(cores ...Core) Core {
    38  	switch len(cores) {
    39  	case 0:
    40  		return NewNopCore()
    41  	case 1:
    42  		return cores[0]
    43  	default:
    44  		return multiCore(cores)
    45  	}
    46  }
    47  
    48  func (mc multiCore) With(fields []Field) Core {
    49  	clone := make(multiCore, len(mc))
    50  	for i := range mc {
    51  		clone[i] = mc[i].With(fields)
    52  	}
    53  	return clone
    54  }
    55  
    56  func (mc multiCore) Level() Level {
    57  	minLvl := _maxLevel // mc is never empty
    58  	for i := range mc {
    59  		if lvl := LevelOf(mc[i]); lvl < minLvl {
    60  			minLvl = lvl
    61  		}
    62  	}
    63  	return minLvl
    64  }
    65  
    66  func (mc multiCore) Enabled(lvl Level) bool {
    67  	for i := range mc {
    68  		if mc[i].Enabled(lvl) {
    69  			return true
    70  		}
    71  	}
    72  	return false
    73  }
    74  
    75  func (mc multiCore) Check(ent Entry, ce *CheckedEntry) *CheckedEntry {
    76  	for i := range mc {
    77  		ce = mc[i].Check(ent, ce)
    78  	}
    79  	return ce
    80  }
    81  
    82  func (mc multiCore) Write(ent Entry, fields []Field) error {
    83  	var err error
    84  	for i := range mc {
    85  		err = multierr.Append(err, mc[i].Write(ent, fields))
    86  	}
    87  	return err
    88  }
    89  
    90  func (mc multiCore) Sync() error {
    91  	var err error
    92  	for i := range mc {
    93  		err = multierr.Append(err, mc[i].Sync())
    94  	}
    95  	return err
    96  }
    97
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