go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/common/logging/sdlogger/tracker.go (about)

     1  // Copyright 2018 The LUCI Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package sdlogger
    16  
    17  import (
    18  	"sync/atomic"
    19  )
    20  
    21  // SeverityTracker wraps LogEntryWriter and observes severity of messages there.
    22  type SeverityTracker struct {
    23  	Out LogEntryWriter
    24  
    25  	debug int32
    26  	info  int32
    27  	warn  int32
    28  	err   int32
    29  }
    30  
    31  // Write is part of LogEntryWriter interface.
    32  func (s *SeverityTracker) Write(l *LogEntry) {
    33  	s.Out.Write(l)
    34  
    35  	var ptr *int32
    36  	switch l.Severity {
    37  	case DebugSeverity:
    38  		ptr = &s.debug
    39  	case InfoSeverity:
    40  		ptr = &s.info
    41  	case WarningSeverity:
    42  		ptr = &s.warn
    43  	case ErrorSeverity:
    44  		ptr = &s.err
    45  	default:
    46  		return
    47  	}
    48  
    49  	if *ptr == 0 {
    50  		atomic.StoreInt32(ptr, 1)
    51  	}
    52  }
    53  
    54  // MaxSeverity returns maximum severity observed thus far or "".
    55  func (s *SeverityTracker) MaxSeverity() Severity {
    56  	switch {
    57  	case atomic.LoadInt32(&s.err) == 1:
    58  		return ErrorSeverity
    59  	case atomic.LoadInt32(&s.warn) == 1:
    60  		return WarningSeverity
    61  	case atomic.LoadInt32(&s.info) == 1:
    62  		return InfoSeverity
    63  	case atomic.LoadInt32(&s.debug) == 1:
    64  		return DebugSeverity
    65  	default:
    66  		return UnknownSeverity
    67  	}
    68  }