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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 thrift is just some useful helpers for interacting with thrift to
// make other code easier to read/write and centralize interactions.
package thrift
import (
"bytes"
"context"
"io"
"github.com/apache/arrow-go/v18/parquet/internal/encryption"
"github.com/apache/thrift/lib/go/thrift"
)
// default factory for creating thrift protocols for serialization/deserialization
var protocolFactory = thrift.NewTCompactProtocolFactoryConf(&thrift.TConfiguration{})
// DeserializeThrift deserializes the bytes in buf into the given thrift msg type
// returns the number of remaining bytes in the buffer that weren't needed for deserialization
// and any error if there was one, or nil.
func DeserializeThrift(msg thrift.TStruct, buf []byte) (remain uint64, err error) {
tbuf := &thrift.TMemoryBuffer{Buffer: bytes.NewBuffer(buf)}
err = msg.Read(context.TODO(), protocolFactory.GetProtocol(tbuf))
remain = tbuf.RemainingBytes()
return
}
// SerializeThriftStream writes out the serialized bytes of the passed in type
// to the given writer stream.
func SerializeThriftStream(msg thrift.TStruct, w io.Writer) error {
return msg.Write(context.TODO(), protocolFactory.GetProtocol(thrift.NewStreamTransportW(w)))
}
// DeserializeThriftStream populates the given msg by reading from the provided
// stream until it completes the deserialization.
func DeserializeThriftStream(msg thrift.TStruct, r io.Reader) error {
return msg.Read(context.TODO(), protocolFactory.GetProtocol(thrift.NewStreamTransportR(r)))
}
// Serializer is an object that can stick around to provide convenience
// functions and allow object reuse
type Serializer struct {
thrift.TSerializer
}
// NewThriftSerializer constructs a serializer with a default buffer of 1024
func NewThriftSerializer() *Serializer {
tbuf := thrift.NewTMemoryBufferLen(1024)
return &Serializer{thrift.TSerializer{
Transport: tbuf,
Protocol: protocolFactory.GetProtocol(tbuf),
}}
}
// Serialize will serialize the given msg to the writer stream w, optionally encrypting it on the way
// if enc is not nil, returning the total number of bytes written and any error received, or nil
func (t *Serializer) Serialize(msg thrift.TStruct, w io.Writer, enc encryption.Encryptor) (int, error) {
b, err := t.Write(context.Background(), msg)
if err != nil {
return 0, err
}
if enc == nil {
return w.Write(b)
}
var cipherBuf bytes.Buffer
cipherBuf.Grow(enc.CiphertextSizeDelta() + len(b))
enc.Encrypt(&cipherBuf, b)
n, err := cipherBuf.WriteTo(w)
return int(n), err
}
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