forked from FerretDB/FerretDB
/
array.go
117 lines (93 loc) · 2.69 KB
/
array.go
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// Copyright 2021 FerretDB Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package oldbson
import (
"bufio"
"fmt"
"strconv"
"github.com/FerretDB/FerretDB/internal/types"
"github.com/FerretDB/FerretDB/internal/util/lazyerrors"
)
// arrayType represents BSON Array type.
type arrayType types.Array
func (a *arrayType) bsontype() {}
// ReadFrom implements bsontype interface.
func (a *arrayType) ReadFrom(r *bufio.Reader) error {
return a.readNested(r, 0)
}
// readNested, similarly to ReadFrom, takes raw bytes from reader
// and unmarshal them to the arrayType.
// It also takes the nesting value, and checks if the
// document doesn't exceed the max nesting allowed.
func (a *arrayType) readNested(r *bufio.Reader, nesting int) error {
if nesting > maxNesting {
return lazyerrors.Errorf("bson.Array.readNested: document has exceeded the max supported nesting: %d", maxNesting)
}
var doc Document
if err := doc.readNested(r, nesting); err != nil {
return lazyerrors.Error(err)
}
keys := doc.Keys()
values := doc.Values()
if len(keys) != len(values) {
panic(fmt.Sprintf("document must have the same number of keys and values (keys: %d, values: %d)", len(keys), len(values)))
}
ta := types.MakeArray(len(keys))
for i, k := range keys {
if k != strconv.Itoa(i) {
return lazyerrors.Errorf("key %d is %q", i, k)
}
v := values[i]
ta.Append(v)
}
*a = arrayType(*ta)
return nil
}
// WriteTo implements bsontype interface.
func (a arrayType) WriteTo(w *bufio.Writer) error {
v, err := a.MarshalBinary()
if err != nil {
return lazyerrors.Error(err)
}
if _, err = w.Write(v); err != nil {
return lazyerrors.Error(err)
}
return nil
}
// MarshalBinary implements bsontype interface.
func (a arrayType) MarshalBinary() ([]byte, error) {
ta := types.Array(a)
l := ta.Len()
fields := make([]field, l)
for i := 0; i < l; i++ {
key := strconv.Itoa(i)
value, err := ta.Get(i)
if err != nil {
return nil, lazyerrors.Error(err)
}
fields[i] = field{key: key, value: value}
}
doc := Document{
fields: fields,
}
b, err := doc.MarshalBinary()
if err != nil {
return nil, lazyerrors.Error(err)
}
return b, nil
}
// check interfaces
var (
_ bsontype = (*arrayType)(nil)
)