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// Copyright 2017-2018 DERO Project. All rights reserved.
// Use of this source code in any form is governed by RESEARCH license.
// license can be found in the LICENSE file.
// GPG: 0F39 E425 8C65 3947 702A 8234 08B2 0360 A03A 9DE8
//
//
// 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.
package p2p
import "bytes"import "encoding/binary"
import "github.com/romana/rlog"
// this file sends a timed sync packet and parses response
/* below is a timed sync request000001DE 01 21 01 01 01 01 01 01 87 00 00 00 00 00 00 00 .!...... ........000001EE 01 ea 03 00 00 00 00 00 00 01 00 00 00 01 00 00 ........ ........000001FE 00 .000001FF 01 11 01 01 01 01 02 01 01 04 0c 70 61 79 6c 6f ........ ...paylo0000020F 61 64 5f 64 61 74 61 0c 10 15 63 75 6d 75 6c 61 ad_data. ..cumula0000021F 74 69 76 65 5f 64 69 66 66 69 63 75 6c 74 79 05 tive_dif ficulty.0000022F 8e 4a f1 09 da 00 00 00 0e 63 75 72 72 65 6e 74 .J...... .current0000023F 5f 68 65 69 67 68 74 05 53 4b 00 00 00 00 00 00 _height. SK......0000024F 06 74 6f 70 5f 69 64 0a 80 1d ca fd 23 08 50 54 .top_id. ....#.PT0000025F 16 e0 41 c8 33 e6 db 91 ca 33 6b b1 fb af 9d a1 ..A.3... .3k.....0000026F 99 f2 77 85 5d a1 e8 2a fa 0b 74 6f 70 5f 76 65 ..w.]..* ..top_ve0000027F 72 73 69 6f 6e 08 06 rsion..
00000000 01 21 01 01 01 01 01 01 87 00 00 00 00 00 00 00 .!...... ........00000010 01 ea 03 00 00 00 00 00 00 01 00 00 00 01 00 00 ........ ........00000020 00 .00000021 01 11 01 01 01 01 02 01 01 04 0c 70 61 79 6c 6f ........ ...paylo00000031 61 64 5f 64 61 74 61 0c 10 15 63 75 6d 75 6c 61 ad_data. ..cumula00000041 74 69 76 65 5f 64 69 66 66 69 63 75 6c 74 79 05 tive_dif ficulty.00000051 2e 9d 54 af fd 00 00 00 0e 63 75 72 72 65 6e 74 ..T..... .current00000061 5f 68 65 69 67 68 74 05 b6 4c 00 00 00 00 00 00 _height. .L......00000071 06 74 6f 70 5f 69 64 0a 80 64 52 25 11 88 5a ca .top_id. .dR%..Z.00000081 10 c8 f9 28 c5 ad a4 03 e1 4f 6d 68 23 8c c5 ea ...(.... .Omh#...00000091 73 e6 16 58 37 d1 96 22 07 0b 74 6f 70 5f 76 65 s..X7.." ..top_ve000000A1 72 73 69 6f 6e 08 06
01 21 01 01 01 01 01 01 87 00 00 00 00 00 00 0001 ea 03 00 00 00 00 00 00 01 00 00 00 01 00 000001 11 01 01 01 01 02 01 01 04 0c 70 61 79 6c 6f61 64 5f 64 61 74 61 0c 10 15 63 75 6d 75 6c 6174 69 76 65 5f 64 69 66 66 69 63 75 6c 74 79 052e 9d 54 af fd 00 00 00 0e 63 75 72 72 65 6e 745f 68 65 69 67 68 74 b6 4c0000000000000006 74 6f 70 64 52 25 11 88 5a ca 10 c8 f9 28 c5ada403e14f6d68238cc5ea73e6165837d19622075da1e82afa0b746f705f766572 73 69 6f 6e 08 06
0121010101010101870000000000000001ea030000000000000100000001000000011101010101020101040c7061796c6f61645f646174610c101563756d756c61746976655f646966666963756c7479052e9d54affd0000000e63757272656e745f 68 65 69 67 68 74 05 b6 4c 00 00 00 00 00 0006 74 6f 70 5f 69 64 0a 80 1d ca fd 23 08 50 64522511885aca10c8f928c5ada403e14f6d68238cc5ea73e6165837d1962207657273696f6e0806
*/func Send_Timed_Sync(connection *Connection) {
request_packet := []byte{0x01, 0x21, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x87, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xea, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x11, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01, 0x04, 0x0c, 0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64, 0x5f, 0x64, 0x61, 0x74, 0x61, 0x0c, 0x10, 0x15, 0x63, 0x75, 0x6d, 0x75, 0x6c, 0x61, 0x74, 0x69, 0x76, 0x65, 0x5f, 0x64, 0x69, 0x66, 0x66, 0x69, 0x63, 0x75, 0x6c, 0x74, 0x79, 0x05, 0x8e, 0x4a, 0xf1, 0x09, 0xda, 0x00, 0x00, 0x00, 0x0e, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x74, 0x5f, 0x68, 0x65, 0x69, 0x67, 0x68, 0x74, 0x05, 0x53, 0x4b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x74, 0x6f, 0x70, 0x5f, 0x69, 0x64, 0x0a, 0x80, 0x1d, 0xca, 0xfd, 0x23, 0x08, 0x50, 0x54, 0x16, 0xe0, 0x41, 0xc8, 0x33, 0xe6, 0xdb, 0x91, 0xca, 0x33, 0x6b, 0xb1, 0xfb, 0xaf, 0x9d, 0xa1, 0x99, 0xf2, 0x77, 0x85, 0x5d, 0xa1, 0xe8, 0x2a, 0xfa, 0x0b, 0x74, 0x6f, 0x70, 0x5f, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x08, 0x06}
// write our data into the packet
top_id := chain.Get_Top_ID() cumulative_diff := chain.Load_Block_Cumulative_Difficulty(top_id) height := chain.Get_Height() top_version := byte(6)
// now lets write that into the buffer
binary.LittleEndian.PutUint64(request_packet[81:], cumulative_diff) binary.LittleEndian.PutUint64(request_packet[105:], height) copy(request_packet[122:], top_id[:]) request_packet[len(request_packet)-1] = top_version
//connection.logger.Infof("sync request packet %x top_id %x", request_packet, top_id)
connection.Lock()
defer connection.Unlock() connection.Conn.Write(request_packet)
connection.Command_queue.PushBack(uint32(P2P_COMMAND_TIMED_SYNC))
}
// handle response of above command
// response comes as below
/* 00000000 01 21 01 01 01 01 01 01 9b 00 00 00 00 00 00 00 .!...... ........ 00000010 00 ea 03 00 00 00 00 00 00 02 00 00 00 01 00 00 ........ ........ 00000020 00 . 00000021 0c 70 61 79 6c 6f 61 64 5f 64 61 74 61 0c 10 15 .payload _data... 00000031 63 75 6d 75 6c 61 74 69 76 65 5f 64 69 66 66 69 cumulati ve_diffi 00000041 63 75 6c 74 79 05 8e 4a f1 09 da 00 00 00 0e 63 culty..J .......c 00000051 75 72 72 65 6e 74 5f 68 65 69 67 68 74 05 52 4b urrent_h eight.RK 00000061 00 00 00 00 00 00 06 74 6f 70 5f 69 64 0a 80 1d .......t op_id... 00000071 ca fd 23 08 50 54 16 e0 41 c8 33 e6 db 91 ca 33 ..#.PT.. A.3....3 00000081 6b b1 fb af 9d a1 99 f2 77 85 5d a1 e8 2a fa 0b k....... w.]..*.. 00000091 74 6f 70 5f 76 65 72 73 69 6f 6e 08 06 01 11 01 top_vers ion..... 000000A1 01 01 01 02 01 01 08 0a 6c 6f 63 61 6c 5f 74 69 ........ local_ti 000000B1 6d 65 05 df 3d 5b 5a 00 00 00 00 me..=[Z. ...*/
func Handle_P2P_Timed_Sync_Response(connection *Connection, i_command_header *Levin_Header, buf []byte) {
var i_data_header Levin_Data_Header // incoming data header, deserialize it
var peer_core_data CORE_DATA err := i_data_header.DeSerialize(buf)
if err != nil { connection.logger.Debugf("Invalid Levin Data header, disconnecting peer") connection.Exit = true return }
// parse incoming core data
pos := bytes.Index(i_data_header.Data, []byte("payload_data")) // at this point to node data and should be parsed as such
if pos < 0 { connection.logger.Debugf("Invalid P2P_COMMAND_TIMED_SYNC_T, could not find payload_data, disconnecting peer") connection.Exit = true return } err = peer_core_data.DeSerialize(i_data_header.Data[pos-1:])
if err != nil { connection.logger.Debugf("Invalid P2P_COMMAND_TIMED_SYNC_T, could not deserialize core_data, disconnecting peer") connection.Exit = true return
}
rlog.Trace(5, "Incoming core data %+v \n", peer_core_data)
// lets check whether we need to resync with this peer
if chain.IsLagging(peer_core_data.Cumulative_Difficulty, peer_core_data.Current_Height, peer_core_data.Top_ID) { connection.logger.Debugf("We need to resync with the peer") // set mode to syncronising
Send_BC_Notify_Chain_Command(connection) }
}
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