/
tchannel_helpers.go
95 lines (82 loc) · 2.63 KB
/
tchannel_helpers.go
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// Copyright (c) 2020 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 zanzibar
import (
"bytes"
"fmt"
"io"
"sync"
"go.uber.org/thriftrw/protocol"
"go.uber.org/thriftrw/wire"
)
var bytesPool = sync.Pool{
New: func() interface{} {
b := make([]byte, 128)
return &b
},
}
// EnsureEmpty ensures that the specified reader is empty. If the reader is
// not empty, it returns an error with the specified stage in the message.
func EnsureEmpty(r io.Reader, stage string) error {
buf := bytesPool.Get().(*[]byte)
defer bytesPool.Put(buf)
n, err := r.Read(*buf)
if n > 0 {
return fmt.Errorf("found unexpected bytes after %s, found (upto 128 bytes): %x", stage, (*buf)[:n])
}
if err == io.EOF {
return nil
}
return err
}
var bufPool = sync.Pool{
New: func() interface{} {
return &bytes.Buffer{}
},
}
// GetBuffer returns a new Byte Buffer from the buffer pool that has been reset
func GetBuffer() *bytes.Buffer {
buf := bufPool.Get().(*bytes.Buffer)
buf.Reset()
return buf
}
// PutBuffer returns byte buffer to the buffer pool
func PutBuffer(buf *bytes.Buffer) {
bufPool.Put(buf)
}
// ReadStruct reads the given Thriftrw struct.
func ReadStruct(reader io.Reader, s RWTStruct) error {
readerAt, ok := reader.(io.ReaderAt)
// do not read all to buffer if reader already is type of io.ReaderAt
if !ok {
buf := GetBuffer()
defer PutBuffer(buf)
if _, err := buf.ReadFrom(reader); err != nil {
return err
}
readerAt = bytes.NewReader(buf.Bytes())
}
wireValue, err := protocol.Binary.Decode(readerAt, wire.TStruct)
if err != nil {
return err
}
err = s.FromWire(wireValue)
return err
}