fs.go

// 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 fs

const (
	snapshotFilePrefix = "snapshot"

	infoFileSuffix           = "info"
	indexFileSuffix          = "index"
	summariesFileSuffix      = "summaries"
	bloomFilterFileSuffix    = "bloomfilter"
	dataFileSuffix           = "data"
	digestFileSuffix         = "digest"
	checkpointFileSuffix     = "checkpoint"
	metadataFileSuffix       = "metadata"
	filesetFilePrefix        = "fileset"
	commitLogFilePrefix      = "commitlog"
	segmentFileSetFilePrefix = "segment"
	fileSuffix               = ".db"

	anyLowerCaseCharsPattern        = "[a-z]*"
	anyNumbersPattern               = "[0-9]*"
	anyLowerCaseCharsNumbersPattern = "[a-z0-9]*"

	separator = "-"
	// Used as the separator for UUIDs in filenames because re-using "-" would break
	// our existing separation logic.
	sanitizedUUIDSeparator = "_"
	// Used to restore "sanitized" UUIDs to their original forms for parsing purposes.
	unsanitizedUUIDSeparator = "-"

	infoFilePattern      = filesetFilePrefix + separator + anyNumbersPattern + separator + infoFileSuffix + fileSuffix
	filesetFilePattern   = filesetFilePrefix + separator + anyNumbersPattern + separator + anyLowerCaseCharsPattern + fileSuffix
	commitLogFilePattern = commitLogFilePrefix + separator + anyNumbersPattern + separator + anyNumbersPattern + fileSuffix
)