github.com/braveheart12/insolar-09-08-19@v0.8.7/network/transport/packet/packet.go (about) 1 /* 2 * The Clear BSD License 3 * 4 * Copyright (c) 2019 Insolar Technologies 5 * 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without modification, are permitted (subject to the limitations in the disclaimer below) provided that the following conditions are met: 9 * 10 * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 11 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 12 * Neither the name of Insolar Technologies nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. 13 * 14 * NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 15 * 16 */ 17 18 package packet 19 20 import ( 21 "bytes" 22 "encoding/binary" 23 "encoding/gob" 24 "io" 25 26 "github.com/insolar/insolar/log" 27 "github.com/insolar/insolar/network" 28 "github.com/insolar/insolar/network/transport/host" 29 "github.com/insolar/insolar/network/transport/packet/types" 30 "github.com/pkg/errors" 31 ) 32 33 // Packet is DHT packet object. 34 type Packet struct { 35 Sender *host.Host 36 Receiver *host.Host 37 Type types.PacketType 38 RequestID network.RequestID 39 RemoteAddress string 40 41 TraceID string 42 Data interface{} 43 Error error 44 IsResponse bool 45 } 46 47 // SerializePacket converts packet to byte slice. 48 func SerializePacket(q *Packet) ([]byte, error) { 49 var msgBuffer bytes.Buffer 50 enc := gob.NewEncoder(&msgBuffer) 51 err := enc.Encode(q) 52 if err != nil { 53 return nil, errors.Wrap(err, "Failed to serialize packet") 54 } 55 56 length := msgBuffer.Len() 57 58 var lengthBytes [8]byte 59 binary.PutUvarint(lengthBytes[:], uint64(length)) 60 61 var result []byte 62 result = append(result, lengthBytes[:]...) 63 result = append(result, msgBuffer.Bytes()...) 64 65 return result, nil 66 } 67 68 // DeserializePacket reads packet from io.Reader. 69 func DeserializePacket(conn io.Reader) (*Packet, error) { 70 71 lengthBytes := make([]byte, 8) 72 if _, err := io.ReadFull(conn, lengthBytes); err != nil { 73 return nil, err 74 } 75 lengthReader := bytes.NewBuffer(lengthBytes) 76 length, err := binary.ReadUvarint(lengthReader) 77 if err != nil { 78 return nil, io.ErrUnexpectedEOF 79 } 80 81 log.Debugf("[ DeserializePacket ] packet length %d", length) 82 buf := make([]byte, length) 83 if _, err := io.ReadFull(conn, buf); err != nil { 84 log.Error("[ DeserializePacket ] couldn't read packet: ", err) 85 return nil, err 86 } 87 log.Debugf("[ DeserializePacket ] read packet") 88 89 msg := &Packet{} 90 dec := gob.NewDecoder(bytes.NewReader(buf)) 91 92 err = dec.Decode(msg) 93 if err != nil { 94 log.Error("[ DeserializePacket ] couldn't decode packet: ", err) 95 return nil, err 96 } 97 98 log.Debugf("[ DeserializePacket ] decoded packet to %#v", msg) 99 100 return msg, nil 101 } 102 103 func init() { 104 gob.Register(&RequestPulse{}) 105 gob.Register(&RequestGetRandomHosts{}) 106 107 gob.Register(&ResponsePulse{}) 108 gob.Register(&ResponseGetRandomHosts{}) 109 }