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pathformatstring.go
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pathformatstring.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package fileout
import (
"os"
"strings"
"time"
"github.com/elastic/beats/v7/libbeat/common/fmtstr"
"github.com/elastic/beats/v7/libbeat/beat"
)
var isWindowsPath = os.PathSeparator == '\\'
// PathFormatString is a wrapper around EventFormatString for the
// handling paths with a format expression that has access to the timestamp format.
// It has special handling for paths, specifically for windows path separator
// which would be interpreted as an escape character. This formatter double escapes
// the path separator so it is properly interpreted by the fmtstr processor
type PathFormatString struct {
efs *fmtstr.EventFormatString
}
// Run executes the format string returning a new expanded string or an error
// if execution or event field expansion fails.
func (fs *PathFormatString) Run(timestamp time.Time) (string, error) {
placeholderEvent := &beat.Event{
Timestamp: timestamp,
}
return fs.efs.Run(placeholderEvent)
}
// Unpack tries to initialize the PathFormatString from provided value
// (which must be a string). Unpack method satisfies go-ucfg.Unpacker interface
// required by config.C, in order to use PathFormatString with
// `common.(*Config).Unpack()`.
func (fs *PathFormatString) Unpack(v interface{}) error {
path, ok := v.(string)
if !ok {
return nil
}
if isWindowsPath {
path = strings.ReplaceAll(path, "\\", "\\\\")
}
fs.efs = &fmtstr.EventFormatString{}
return fs.efs.Unpack(path)
}