github.com/go-kivik/kivik/v4@v4.3.2/x/memorydb/alldocs.go (about)

     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 memorydb
    14  
    15  import (
    16  	"bytes"
    17  	"context"
    18  	"encoding/json"
    19  	"errors"
    20  	"fmt"
    21  	"io"
    22  	"net/http"
    23  
    24  	"github.com/go-kivik/kivik/v4"
    25  	"github.com/go-kivik/kivik/v4/driver"
    26  )
    27  
    28  func (d *db) AllDocs(ctx context.Context, _ driver.Options) (driver.Rows, error) {
    29  	if exists, _ := d.DBExists(ctx, d.dbName, kivik.Params(nil)); !exists {
    30  		return nil, statusError{status: http.StatusNotFound, error: errors.New("database does not exist")}
    31  	}
    32  	rows := &alldocsResults{
    33  		resultSet{
    34  			docIDs: make([]string, 0),
    35  			revs:   make([]*revision, 0),
    36  		},
    37  	}
    38  	for docID := range d.db.docs {
    39  		if doc, found := d.db.latestRevision(docID); found {
    40  			rows.docIDs = append(rows.docIDs, docID)
    41  			rows.revs = append(rows.revs, doc)
    42  		}
    43  	}
    44  	rows.offset = 0
    45  	rows.totalRows = int64(len(rows.docIDs))
    46  	return rows, nil
    47  }
    48  
    49  type resultSet struct {
    50  	docIDs            []string
    51  	revs              []*revision
    52  	offset, totalRows int64
    53  	updateSeq         string
    54  }
    55  
    56  func (r *resultSet) Close() error {
    57  	r.revs = nil
    58  	return nil
    59  }
    60  
    61  func (r *resultSet) UpdateSeq() string { return r.updateSeq }
    62  func (r *resultSet) TotalRows() int64  { return r.totalRows }
    63  func (r *resultSet) Offset() int64     { return r.offset }
    64  
    65  type alldocsResults struct {
    66  	resultSet
    67  }
    68  
    69  var _ driver.Rows = &alldocsResults{}
    70  
    71  func (r *alldocsResults) Next(row *driver.Row) error {
    72  	if r.revs == nil || len(r.revs) == 0 {
    73  		return io.EOF
    74  	}
    75  	row.ID, r.docIDs = r.docIDs[0], r.docIDs[1:]
    76  	var next *revision
    77  	next, r.revs = r.revs[0], r.revs[1:]
    78  	row.Key = []byte(fmt.Sprintf(`"%s"`, row.ID))
    79  	value, err := json.Marshal(map[string]string{
    80  		"rev": fmt.Sprintf("%d-%s", next.ID, next.Rev),
    81  	})
    82  	if err != nil {
    83  		panic(err)
    84  	}
    85  	row.Value = bytes.NewReader(value)
    86  	return nil
    87  }