compact.go

Documentation: github.com/go-kivik/kivik/v4/x/fsdb

     1  // Licensed under the Apache License, Version 2.0 (the "License"); you may not
     2  // use this file except in compliance with the License. You may obtain a copy of
     3  // the License at
     4  //
     5  //  http://www.apache.org/licenses/LICENSE-2.0
     6  //
     7  // Unless required by applicable law or agreed to in writing, software
     8  // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
     9  // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    10  // License for the specific language governing permissions and limitations under
    11  // the License.
    12  
    13  package fs
    14  
    15  import (
    16  	"context"
    17  	"strings"
    18  
    19  	"github.com/go-kivik/kivik/v4"
    20  	"github.com/go-kivik/kivik/v4/x/fsdb/cdb"
    21  	"github.com/go-kivik/kivik/v4/x/fsdb/cdb/decode"
    22  	"github.com/go-kivik/kivik/v4/x/fsdb/filesystem"
    23  )
    24  
    25  type docIndex map[string]*cdb.Document
    26  
    27  func (i docIndex) readIndex(ctx context.Context, fs filesystem.Filesystem, path string) error {
    28  	dir, err := fs.Open(path)
    29  	if err != nil {
    30  		return kerr(err)
    31  	}
    32  	files, err := dir.Readdir(-1)
    33  	if err != nil {
    34  		return kerr(err)
    35  	}
    36  
    37  	c := cdb.New(path, fs)
    38  
    39  	var docID string
    40  	for _, info := range files {
    41  		if err := ctx.Err(); err != nil {
    42  			return err
    43  		}
    44  		switch {
    45  		case !info.IsDir():
    46  			id, _, ok := decode.ExplodeFilename(info.Name())
    47  			if !ok {
    48  				// ignore unrecognized files
    49  				continue
    50  			}
    51  			docID = id
    52  		case info.IsDir() && info.Name()[0] == '.':
    53  			docID = strings.TrimPrefix(info.Name(), ".")
    54  		default:
    55  			continue
    56  		}
    57  		if _, ok := i[docID]; ok {
    58  			// We've already read this one
    59  			continue
    60  		}
    61  		doc, err := c.OpenDocID(docID, kivik.Params(nil))
    62  		if err != nil {
    63  			return err
    64  		}
    65  		i[docID] = doc
    66  	}
    67  	return nil
    68  }
    69  
    70  func (d *db) Compact(ctx context.Context) error {
    71  	return d.compact(ctx, filesystem.Default())
    72  }
    73  
    74  func (d *db) compact(ctx context.Context, fs filesystem.Filesystem) error {
    75  	docs := docIndex{}
    76  	if err := docs.readIndex(ctx, fs, d.path()); err != nil {
    77  		return err
    78  	}
    79  	for _, doc := range docs {
    80  		if err := doc.Compact(ctx); err != nil {
    81  			return err
    82  		}
    83  	}
    84  	return nil
    85  }
    86
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