/
encode.go
159 lines (129 loc) · 3.46 KB
/
encode.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 bson
import (
"bytes"
"fmt"
"time"
"github.com/cristalhq/bson/bsonproto"
"github.com/FerretDB/FerretDB/internal/util/lazyerrors"
)
// encodeField encodes document/array field.
//
// It panics if v is not a valid type.
func encodeField(buf *bytes.Buffer, name string, v any) error {
switch v := v.(type) {
case *Document:
if err := buf.WriteByte(byte(tagDocument)); err != nil {
return lazyerrors.Error(err)
}
b := make([]byte, SizeCString(name))
EncodeCString(b, name)
if _, err := buf.Write(b); err != nil {
return lazyerrors.Error(err)
}
b, err := v.Encode()
if err != nil {
return lazyerrors.Error(err)
}
if _, err := buf.Write(b); err != nil {
return lazyerrors.Error(err)
}
case RawDocument:
if err := buf.WriteByte(byte(tagDocument)); err != nil {
return lazyerrors.Error(err)
}
b := make([]byte, SizeCString(name))
EncodeCString(b, name)
if _, err := buf.Write(b); err != nil {
return lazyerrors.Error(err)
}
if _, err := buf.Write(v); err != nil {
return lazyerrors.Error(err)
}
case *Array:
if err := buf.WriteByte(byte(tagArray)); err != nil {
return lazyerrors.Error(err)
}
b := make([]byte, SizeCString(name))
EncodeCString(b, name)
if _, err := buf.Write(b); err != nil {
return lazyerrors.Error(err)
}
b, err := v.Encode()
if err != nil {
return lazyerrors.Error(err)
}
if _, err := buf.Write(b); err != nil {
return lazyerrors.Error(err)
}
case RawArray:
if err := buf.WriteByte(byte(tagArray)); err != nil {
return lazyerrors.Error(err)
}
b := make([]byte, SizeCString(name))
EncodeCString(b, name)
if _, err := buf.Write(b); err != nil {
return lazyerrors.Error(err)
}
if _, err := buf.Write(v); err != nil {
return lazyerrors.Error(err)
}
default:
return encodeScalarField(buf, name, v)
}
return nil
}
// encodeScalarField encodes scalar document field.
//
// It panics if v is not a scalar value.
func encodeScalarField(buf *bytes.Buffer, name string, v any) error {
switch v := v.(type) {
case float64:
buf.WriteByte(byte(tagFloat64))
case string:
buf.WriteByte(byte(tagString))
case Binary:
buf.WriteByte(byte(tagBinary))
case ObjectID:
buf.WriteByte(byte(tagObjectID))
case bool:
buf.WriteByte(byte(tagBool))
case time.Time:
buf.WriteByte(byte(tagTime))
case NullType:
buf.WriteByte(byte(tagNull))
case Regex:
buf.WriteByte(byte(tagRegex))
case int32:
buf.WriteByte(byte(tagInt32))
case Timestamp:
buf.WriteByte(byte(tagTimestamp))
case int64:
buf.WriteByte(byte(tagInt64))
default:
panic(fmt.Sprintf("invalid BSON type %T", v))
}
b := make([]byte, SizeCString(name))
EncodeCString(b, name)
if _, err := buf.Write(b); err != nil {
return lazyerrors.Error(err)
}
b = make([]byte, bsonproto.SizeAny(v))
bsonproto.EncodeAny(b, v)
if _, err := buf.Write(b); err != nil {
return lazyerrors.Error(err)
}
return nil
}