github.com/go-kivik/kivik/v4@v4.3.2/pouchdb/rows.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  //go:build js
    14  
    15  package pouchdb
    16  
    17  import (
    18  	"encoding/json"
    19  	"io"
    20  	"strings"
    21  
    22  	"github.com/gopherjs/gopherjs/js"
    23  
    24  	"github.com/go-kivik/kivik/v4/driver"
    25  	"github.com/go-kivik/kivik/v4/pouchdb/bindings"
    26  )
    27  
    28  var jsJSON *js.Object
    29  
    30  func init() {
    31  	jsJSON = js.Global.Get("JSON")
    32  }
    33  
    34  type rows struct {
    35  	*js.Object
    36  	Off   int64  `js:"offset"`
    37  	TRows int64  `js:"total_rows"`
    38  	USeq  string `js:"update_seq"`
    39  }
    40  
    41  var _ driver.Rows = &rows{}
    42  
    43  func (r *rows) Close() error {
    44  	r.Delete("rows") // Free up memory used by any remaining rows
    45  	return nil
    46  }
    47  
    48  func (r *rows) Next(row *driver.Row) (err error) {
    49  	defer bindings.RecoverError(&err)
    50  	if r.Get("rows") == js.Undefined || r.Get("rows").Length() == 0 {
    51  		return io.EOF
    52  	}
    53  	next := r.Get("rows").Call("shift")
    54  	row.ID = next.Get("id").String()
    55  	row.Key = json.RawMessage(jsJSON.Call("stringify", next.Get("key")).String())
    56  	row.Value = strings.NewReader(jsJSON.Call("stringify", next.Get("value")).String())
    57  	if doc := next.Get("doc"); doc != js.Undefined {
    58  		row.Doc = strings.NewReader(jsJSON.Call("stringify", doc).String())
    59  	}
    60  	return nil
    61  }
    62  
    63  func (r *rows) Offset() int64 {
    64  	return r.Off
    65  }
    66  
    67  func (r *rows) TotalRows() int64 {
    68  	return r.TRows
    69  }
    70  
    71  func (r *rows) UpdateSeq() string {
    72  	return "" // PouchDB doesn't support this option
    73  }