github.com/m3db/m3@v1.5.0/src/dbnode/persist/fs/read_fileset_digests.go (about)

     1  // Copyright (c) 2017 Uber Technologies, Inc.
     2  //
     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
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     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 fs
    22  
    23  import (
    24  	"github.com/m3db/m3/src/dbnode/digest"
    25  )
    26  
    27  // filesetDigests is a container struct for storing a digest for all of the
    28  // fileset files for a given shard / block combination
    29  type filesetDigests struct {
    30  	infoDigest        uint32
    31  	indexDigest       uint32
    32  	summariesDigest   uint32
    33  	bloomFilterDigest uint32
    34  	dataDigest        uint32
    35  }
    36  
    37  // note that caller is responsible for calling Validate()
    38  func readFileSetDigests(
    39  	digestFdWithDigestContents digest.FdWithDigestContentsReader,
    40  ) (filesetDigests, error) {
    41  	var (
    42  		fsDigests filesetDigests
    43  		err       error
    44  	)
    45  
    46  	if fsDigests.infoDigest, err = digestFdWithDigestContents.ReadDigest(); err != nil {
    47  		return fsDigests, err
    48  	}
    49  	if fsDigests.indexDigest, err = digestFdWithDigestContents.ReadDigest(); err != nil {
    50  		return fsDigests, err
    51  	}
    52  	if fsDigests.summariesDigest, err = digestFdWithDigestContents.ReadDigest(); err != nil {
    53  		return fsDigests, err
    54  	}
    55  	if fsDigests.bloomFilterDigest, err = digestFdWithDigestContents.ReadDigest(); err != nil {
    56  		return fsDigests, err
    57  	}
    58  	if fsDigests.dataDigest, err = digestFdWithDigestContents.ReadDigest(); err != nil {
    59  		return fsDigests, err
    60  	}
    61  
    62  	return fsDigests, nil
    63  }