earthbucks_lib 0.8.5

EarthBucks library for data structures and algorithms
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145

use crate::buf_reader::BufReader;
use crate::buf_writer::BufWriter;
use crate::error::EbxError;
use crate::header::Header;
use crate::tx::Tx;
use crate::var_int::VarInt;

pub struct Block {
    pub header: Header,
    pub txs: Vec<Tx>,
}

impl Block {
    pub fn new(header: Header, txs: Vec<Tx>) -> Self {
        Self { header, txs }
    }

    pub fn from_buf_reader(br: &mut BufReader) -> Result<Self, EbxError> {
        let header = Header::from_buf_reader(br)?;
        let tx_count_varint = VarInt::from_buf_reader(br)?;
        if !tx_count_varint.is_minimal() {
            return Err(EbxError::NonMinimalEncodingError { source: None });
        }
        let tx_count = tx_count_varint.to_u64()? as usize;
        let mut txs = vec![];
        for _ in 0..tx_count {
            let tx = Tx::from_buf_reader(br)?;
            txs.push(tx);
        }
        Ok(Self { header, txs })
    }

    pub fn to_buffer_writer(&self) -> BufWriter {
        let mut bw = BufWriter::new();
        bw.write(self.header.to_buf().to_vec());
        bw.write(VarInt::from_u64(self.txs.len() as u64).to_buf());
        for tx in &self.txs {
            bw.write(tx.to_buffer_writer().to_buf());
        }
        bw
    }

    pub fn to_buf(&self) -> Vec<u8> {
        self.to_buffer_writer().to_buf()
    }

    pub fn from_buf(buf: Vec<u8>) -> Result<Self, EbxError> {
        let mut br = BufReader::new(buf);
        Self::from_buf_reader(&mut br)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::numbers::u256;

    #[test]
    fn test_to_buffer_writer() {
        let header = Header {
            version: 0,
            prev_block_id: [0; 32],
            merkle_root: [0; 32],
            timestamp: 0,
            block_num: 0,
            target: u256::from(0u8),
            nonce: u256::from(0u8),
            work_ser_algo: 0,
            work_ser_hash: [0; 32],
            work_par_algo: 0,
            work_par_hash: [0; 32],
        };
        let tx = Tx::new(0, vec![], vec![], 1);
        let block = Block::new(header, vec![tx]);
        let bw = block.to_buffer_writer();
        assert!(!bw.to_buf().is_empty());
    }

    #[test]
    fn test_to_buf_and_from_buf() {
        let header = Header {
            version: 0,
            prev_block_id: [0; 32],
            merkle_root: [0; 32],
            timestamp: 0,
            block_num: 0,
            target: u256::from(0u8),
            nonce: u256::from(0u8),
            work_ser_algo: 0,
            work_ser_hash: [0; 32],
            work_par_algo: 0,
            work_par_hash: [0; 32],
        };
        let tx = Tx::new(0, vec![], vec![], 1);
        let block1 = Block::new(header, vec![tx]);
        let buf = block1.to_buf();
        let block2 = Block::from_buf(buf).unwrap();
        assert_eq!(block1.header.version, block2.header.version);
        assert_eq!(block1.txs[0].version, block2.txs[0].version);
    }

    #[test]
    fn test_from_buf_reader() {
        let header = Header {
            version: 0,
            prev_block_id: [0; 32],
            merkle_root: [0; 32],
            timestamp: 0,
            block_num: 0,
            target: u256::from(0u8),
            nonce: u256::from(0u8),
            work_ser_algo: 0,
            work_ser_hash: [0; 32],
            work_par_algo: 0,
            work_par_hash: [0; 32],
        };
        let tx = Tx::new(0, vec![], vec![], 1);
        let block1 = Block::new(header, vec![tx]);
        let buf = block1.to_buf();
        let mut br = BufReader::new(buf);
        let block2 = Block::from_buf_reader(&mut br).unwrap();
        assert_eq!(block1.header.version, block2.header.version);
        assert_eq!(block1.txs[0].version, block2.txs[0].version);
    }

    #[test]
    fn test_is_genesis() {
        let header = Header {
            version: 0,
            prev_block_id: [0; 32],
            merkle_root: [0; 32],
            timestamp: 0,
            block_num: 0,
            target: u256::from(0u8),
            nonce: u256::from(0u8),
            work_ser_algo: 0,
            work_ser_hash: [0; 32],
            work_par_algo: 0,
            work_par_hash: [0; 32],
        };
        let tx = Tx::new(0, vec![], vec![], 0);
        let block = Block::new(header, vec![tx]);
        assert!(block.header.is_genesis());
    }
}