github.com/alibaba/ilogtail/pkg@v0.0.0-20250526110833-c53b480d046c/helper/split_log_helper.go (about)

     1  // Copyright 2023 iLogtail 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 helper
    16  
    17  import (
    18  	"strconv"
    19  
    20  	"github.com/alibaba/ilogtail/pkg/protocol"
    21  )
    22  
    23  var FileOffsetKey = "__tag__:__file_offset__"
    24  var ReservedFileOffsetKey = "__file_offset__"
    25  
    26  func ReviseFileOffset(log *protocol.Log, offset int64, enableMeta bool) {
    27  	if enableMeta {
    28  		cont := GetFileOffsetTag(log)
    29  		if cont != nil {
    30  			if beginOffset, err := strconv.ParseInt(cont.Value, 10, 64); err == nil {
    31  				cont.Value = strconv.FormatInt(beginOffset+offset, 10)
    32  			}
    33  		}
    34  	}
    35  }
    36  
    37  func GetFileOffsetTag(log *protocol.Log) *protocol.Log_Content {
    38  	for i := len(log.Contents) - 1; i >= 0; i-- {
    39  		cont := log.Contents[i]
    40  		if cont.Key == FileOffsetKey || cont.Key == ReservedFileOffsetKey {
    41  			return cont
    42  		}
    43  	}
    44  	return nil
    45  }