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176 lines
7.0 KiB
176 lines
7.0 KiB
package p2p
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import "bytes"
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import "encoding/binary"
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import "github.com/romana/rlog"
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// this file sends a timed sync packet and parses response
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/* below is a timed sync request
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000001DE 01 21 01 01 01 01 01 01 87 00 00 00 00 00 00 00 .!...... ........
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000001EE 01 ea 03 00 00 00 00 00 00 01 00 00 00 01 00 00 ........ ........
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000001FE 00 .
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000001FF 01 11 01 01 01 01 02 01 01 04 0c 70 61 79 6c 6f ........ ...paylo
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0000020F 61 64 5f 64 61 74 61 0c 10 15 63 75 6d 75 6c 61 ad_data. ..cumula
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0000021F 74 69 76 65 5f 64 69 66 66 69 63 75 6c 74 79 05 tive_dif ficulty.
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0000022F 8e 4a f1 09 da 00 00 00 0e 63 75 72 72 65 6e 74 .J...... .current
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0000023F 5f 68 65 69 67 68 74 05 53 4b 00 00 00 00 00 00 _height. SK......
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0000024F 06 74 6f 70 5f 69 64 0a 80 1d ca fd 23 08 50 54 .top_id. ....#.PT
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0000025F 16 e0 41 c8 33 e6 db 91 ca 33 6b b1 fb af 9d a1 ..A.3... .3k.....
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0000026F 99 f2 77 85 5d a1 e8 2a fa 0b 74 6f 70 5f 76 65 ..w.]..* ..top_ve
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0000027F 72 73 69 6f 6e 08 06 rsion..
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00000000 01 21 01 01 01 01 01 01 87 00 00 00 00 00 00 00 .!...... ........
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00000010 01 ea 03 00 00 00 00 00 00 01 00 00 00 01 00 00 ........ ........
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00000020 00 .
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00000021 01 11 01 01 01 01 02 01 01 04 0c 70 61 79 6c 6f ........ ...paylo
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00000031 61 64 5f 64 61 74 61 0c 10 15 63 75 6d 75 6c 61 ad_data. ..cumula
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00000041 74 69 76 65 5f 64 69 66 66 69 63 75 6c 74 79 05 tive_dif ficulty.
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00000051 2e 9d 54 af fd 00 00 00 0e 63 75 72 72 65 6e 74 ..T..... .current
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00000061 5f 68 65 69 67 68 74 05 b6 4c 00 00 00 00 00 00 _height. .L......
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00000071 06 74 6f 70 5f 69 64 0a 80 64 52 25 11 88 5a ca .top_id. .dR%..Z.
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00000081 10 c8 f9 28 c5 ad a4 03 e1 4f 6d 68 23 8c c5 ea ...(.... .Omh#...
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00000091 73 e6 16 58 37 d1 96 22 07 0b 74 6f 70 5f 76 65 s..X7.." ..top_ve
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000000A1 72 73 69 6f 6e 08 06
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01 21 01 01 01 01 01 01 87 00 00 00 00 00 00 00
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01 ea 03 00 00 00 00 00 00 01 00 00 00 01 00 00
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00
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01 11 01 01 01 01 02 01 01 04 0c 70 61 79 6c 6f
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61 64 5f 64 61 74 61 0c 10 15 63 75 6d 75 6c 61
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74 69 76 65 5f 64 69 66 66 69 63 75 6c 74 79 05
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2e 9d 54 af fd 00 00 00 0e 63 75 72 72 65 6e 74
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5f 68 65 69 67 68 74 b6 4c00000000000000
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06 74 6f 70 64 52 25 11 88 5a ca 10 c8 f9 28 c5
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ada403e14f6d68238cc5ea73e6165837
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d19622075da1e82afa0b746f705f7665
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72 73 69 6f 6e 08 06
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01210101010101018700000000000000
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01ea0300000000000001000000010000
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00
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011101010101020101040c7061796c6f
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61645f646174610c101563756d756c61
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746976655f646966666963756c747905
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2e9d54affd0000000e63757272656e74
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5f 68 65 69 67 68 74 05 b6 4c 00 00 00 00 00 00
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06 74 6f 70 5f 69 64 0a 80 1d ca fd 23 08 50 64
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522511885aca10c8f928c5ada403e14f
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6d68238cc5ea73e6165837d196220765
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7273696f6e0806
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*/
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func Send_Timed_Sync(connection *Connection) {
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request_packet:=[]byte { 0x01, 0x21, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
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0x87, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x01, 0xea, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00,
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0x00,
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0x01, 0x11, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01,
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0x01, 0x04, 0x0c, 0x70, 0x61, 0x79, 0x6c, 0x6f,
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0x61, 0x64, 0x5f, 0x64, 0x61, 0x74, 0x61, 0x0c,
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0x10, 0x15, 0x63, 0x75, 0x6d, 0x75, 0x6c, 0x61,
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0x74, 0x69, 0x76, 0x65, 0x5f, 0x64, 0x69, 0x66,
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0x66, 0x69, 0x63, 0x75, 0x6c, 0x74, 0x79, 0x05,
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0x8e, 0x4a, 0xf1, 0x09, 0xda, 0x00, 0x00, 0x00,
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0x0e, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x74,
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0x5f, 0x68, 0x65, 0x69, 0x67, 0x68, 0x74, 0x05,
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0x53, 0x4b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x06, 0x74, 0x6f, 0x70, 0x5f, 0x69, 0x64, 0x0a,
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0x80, 0x1d, 0xca, 0xfd, 0x23, 0x08, 0x50, 0x54,
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0x16, 0xe0, 0x41, 0xc8, 0x33, 0xe6, 0xdb, 0x91,
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0xca, 0x33, 0x6b, 0xb1, 0xfb, 0xaf, 0x9d, 0xa1,
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0x99, 0xf2, 0x77, 0x85, 0x5d, 0xa1, 0xe8, 0x2a,
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0xfa, 0x0b, 0x74, 0x6f, 0x70, 0x5f, 0x76, 0x65,
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0x72, 0x73, 0x69, 0x6f, 0x6e, 0x08, 0x06, };
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// write our data into the packet
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top_id := chain.Get_Top_ID()
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cumulative_diff := chain.Load_Block_Cumulative_Difficulty(top_id)
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height := chain.Get_Height()
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top_version := byte(6)
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// now lets write that into the buffer
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binary.LittleEndian.PutUint64(request_packet[81:],cumulative_diff)
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binary.LittleEndian.PutUint64(request_packet[105:],height)
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copy(request_packet[122:],top_id[:])
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request_packet[len(request_packet)-1]= top_version
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//connection.logger.Infof("sync request packet %x top_id %x", request_packet, top_id)
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connection.Lock()
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defer connection.Unlock()
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connection.Conn.Write(request_packet)
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connection.Command_queue.PushBack(uint32(P2P_COMMAND_TIMED_SYNC))
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}
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// handle response of above command
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// response comes as below
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/*
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00000000 01 21 01 01 01 01 01 01 9b 00 00 00 00 00 00 00 .!...... ........
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00000010 00 ea 03 00 00 00 00 00 00 02 00 00 00 01 00 00 ........ ........
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00000020 00 .
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00000021 0c 70 61 79 6c 6f 61 64 5f 64 61 74 61 0c 10 15 .payload _data...
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00000031 63 75 6d 75 6c 61 74 69 76 65 5f 64 69 66 66 69 cumulati ve_diffi
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00000041 63 75 6c 74 79 05 8e 4a f1 09 da 00 00 00 0e 63 culty..J .......c
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00000051 75 72 72 65 6e 74 5f 68 65 69 67 68 74 05 52 4b urrent_h eight.RK
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00000061 00 00 00 00 00 00 06 74 6f 70 5f 69 64 0a 80 1d .......t op_id...
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00000071 ca fd 23 08 50 54 16 e0 41 c8 33 e6 db 91 ca 33 ..#.PT.. A.3....3
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00000081 6b b1 fb af 9d a1 99 f2 77 85 5d a1 e8 2a fa 0b k....... w.]..*..
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00000091 74 6f 70 5f 76 65 72 73 69 6f 6e 08 06 01 11 01 top_vers ion.....
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000000A1 01 01 01 02 01 01 08 0a 6c 6f 63 61 6c 5f 74 69 ........ local_ti
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000000B1 6d 65 05 df 3d 5b 5a 00 00 00 00 me..=[Z. ...
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*/
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func Handle_P2P_Timed_Sync_Response(connection *Connection,
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i_command_header *Levin_Header, buf []byte) {
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var i_data_header Levin_Data_Header // incoming data header, deserialize it
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var peer_core_data CORE_DATA
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err := i_data_header.DeSerialize(buf)
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if err != nil {
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connection.logger.Debugf("Invalid Levin Data header, disconnecting peer")
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connection.Exit = true
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return
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}
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// parse incoming core data
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pos := bytes.Index(i_data_header.Data, []byte("payload_data")) // at this point to node data and should be parsed as such
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if pos < 0 {
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connection.logger.Debugf("Invalid P2P_COMMAND_TIMED_SYNC_T, could not find payload_data, disconnecting peer")
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connection.Exit = true
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return
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}
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err = peer_core_data.DeSerialize(i_data_header.Data[pos-1:])
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if err != nil {
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connection.logger.Debugf("Invalid P2P_COMMAND_TIMED_SYNC_T, could not deserialize core_data, disconnecting peer")
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connection.Exit = true
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return
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}
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rlog.Trace(5, "Incoming core data %+v \n", peer_core_data)
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// lets check whether we need to resync with this peer
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if chain.IsLagging(peer_core_data.Cumulative_Difficulty, peer_core_data.Current_Height, peer_core_data.Top_ID) {
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connection.logger.Debugf("We need to resync with the peer")
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// set mode to syncronising
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Send_BC_Notify_Chain_Command(connection)
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}
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}
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