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encoder.go
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encoder.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package proto
import (
"fmt"
"github.com/m3db/m3x/pool"
)
type encoder struct {
buffer []byte
bytesPool pool.BytesPool
maxMessageSize int
encoded int
}
// NewEncoder creates a new encoder, the implementation is not thread safe.
func NewEncoder(opts Options) Encoder {
if opts == nil {
opts = NewOptions()
}
pool := opts.BytesPool()
return &encoder{
buffer: getByteSliceWithLength(sizeEncodingLength, pool),
bytesPool: pool,
maxMessageSize: opts.MaxMessageSize(),
}
}
func (e *encoder) Encode(m Marshaler) error {
size := m.Size()
if size > e.maxMessageSize {
return fmt.Errorf("message size %d is larger than maximum supported size %d", size, e.maxMessageSize)
}
e.buffer = growDataBufferIfNeeded(e.buffer, sizeEncodingLength+size, e.bytesPool)
e.encodeSize(size)
if err := e.encodeData(e.buffer[sizeEncodingLength:], m); err != nil {
return err
}
e.encoded = sizeEncodingLength + size
return nil
}
func (e *encoder) Bytes() []byte {
return e.buffer[:e.encoded]
}
func (e *encoder) encodeSize(size int) {
sizeEncodeDecoder.PutUint32(e.buffer, uint32(size))
}
func (e *encoder) encodeData(buffer []byte, m Marshaler) error {
_, err := m.MarshalTo(buffer)
return err
}