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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197

pub static SUCCESS: &[u8] = &[0, 0, 0, 1, 0];

#[derive(Debug, Error, PartialEq)]
pub enum RaftError {
    #[error("success")]
    Success,
    #[error("success raw")]
    SuccessRaw(Vec<u8>),
    #[error("{0}")]
    Error(String),
    #[error("net has error: {0}")]
    NetError(String),
    #[error("io has error: {0}")]
    IOError(String),
    #[error("not found address by node id:{0}")]
    NotfoundAddr(u64),
    #[error("term less than target machine")]
    TermLess,
    #[error("term greater than target machine")]
    TermGreater,
    #[error("index:{0} less than target machine:{1} ")]
    IndexLess(u64, u64),
    #[error("vote not allow")]
    VoteNotAllow,
    #[error("type has err")]
    TypeErr,
    #[error("raft not found by id:{0}")]
    RaftNotFound(u64),
    #[error("raft not leader leader is:{0}")]
    NotLeader(u64),
    #[error("raft log file not found by id:{0}")]
    LogFileNotFound(u64),
    #[error("raft log file invalid by id:{0}")]
    LogFileInvalid(u64),
    #[error("time out by ms:{0}")]
    Timeout(u64),
    #[error("incomplete data for type:{0}")]
    IncompleteErr(u64),
    #[error("engine not ready")]
    NotReady,
    #[error("not enough recipiet expect:{0} found:{1}")]
    NotEnoughRecipient(u16, u16),
    #[error("err code:{0} msg:{1}")]
    ErrCode(i32, String),
    #[error("index:{0} out of memory index")]
    OutMemIndex(u64),
}

impl RaftError {
    fn id(&self) -> u8 {
        match self {
            RaftError::Success => 0,
            RaftError::SuccessRaw(_) => 1,
            RaftError::Error(_) => 2,
            RaftError::NetError(_) => 3,
            RaftError::IOError(_) => 4,
            RaftError::NotfoundAddr(_) => 5,
            RaftError::TermLess => 6,
            RaftError::TermGreater => 7,
            RaftError::IndexLess(_, _) => 8,
            RaftError::VoteNotAllow => 9,
            RaftError::TypeErr => 10,
            RaftError::RaftNotFound(_) => 11,
            RaftError::NotLeader(_) => 12,
            RaftError::LogFileNotFound(_) => 13,
            RaftError::LogFileInvalid(_) => 14,
            RaftError::Timeout(_) => 15,
            RaftError::IncompleteErr(_) => 16,
            RaftError::NotReady => 17,
            RaftError::NotEnoughRecipient(_, _) => 18,
            RaftError::ErrCode(_, _) => 19,
            RaftError::OutMemIndex(_) => 20,
        }
    }
}

pub type RaftResult<T> = std::result::Result<T, RaftError>;

pub fn convert<T, E: ToString>(result: std::result::Result<T, E>) -> RaftResult<T> {
    match result {
        Ok(t) => Ok(t),
        Err(e) => Err(RaftError::Error(e.to_string())),
    }
}

impl RaftError {
    pub fn encode(&self) -> Vec<u8> {
        let mut result: Vec<u8>;
        match self {
            RaftError::Success
            | RaftError::TermLess
            | RaftError::TermGreater
            | RaftError::VoteNotAllow
            | RaftError::TypeErr
            | RaftError::NotReady => {
                result = Vec::with_capacity(1);
                result.push(self.id());
            }
            RaftError::Error(msg) | RaftError::NetError(msg) | RaftError::IOError(msg) => {
                result = Vec::with_capacity(1 + msg.len());
                result.push(self.id());
                result.extend_from_slice(msg.as_str().as_bytes());
            }
            RaftError::SuccessRaw(raw) => {
                result = Vec::with_capacity(1 + raw.len());
                result.push(self.id());
                result.extend_from_slice(raw);
            }
            RaftError::NotfoundAddr(num)
            | RaftError::RaftNotFound(num)
            | RaftError::NotLeader(num)
            | RaftError::LogFileNotFound(num)
            | RaftError::LogFileInvalid(num)
            | RaftError::Timeout(num)
            | RaftError::OutMemIndex(num)
            | RaftError::IncompleteErr(num) => {
                result = Vec::with_capacity(9);
                result.push(self.id());
                result.extend_from_slice(&u64::to_be_bytes(*num));
            }
            RaftError::IndexLess(index, target) => {
                result = Vec::with_capacity(17);
                result.push(self.id());
                result.extend_from_slice(&u64::to_be_bytes(*index));
                result.extend_from_slice(&u64::to_be_bytes(*target));
            }
            RaftError::NotEnoughRecipient(expect, got) => {
                result = Vec::with_capacity(5);
                result.push(self.id());
                result.extend_from_slice(&u16::to_be_bytes(*expect));
                result.extend_from_slice(&u16::to_be_bytes(*got));
            }
            RaftError::ErrCode(code, msg) => {
                result = Vec::with_capacity(4 + msg.len());
                result.push(self.id());
                result.extend_from_slice(&i32::to_be_bytes(*code));
                result.extend_from_slice(msg.as_str().as_bytes());
            }
        }

        result
    }

    pub fn decode(data: &Vec<u8>) -> Self {
        if data.len() < 1 {
            return RaftError::IncompleteErr(0);
        }
        match data[0] {
            0 => RaftError::Success,
            1 => RaftError::SuccessRaw(data[1..].to_vec()),
            2 => RaftError::Error(read_string(data, 1)),
            3 => RaftError::NetError(read_string(data, 1)),
            4 => RaftError::IOError(read_string(data, 1)),
            5 => RaftError::NotfoundAddr(read_u64_slice(data, 1)),
            6 => RaftError::TermLess,
            7 => RaftError::TermGreater,
            8 => RaftError::IndexLess(read_u64_slice(data, 1), read_u64_slice(data, 9)),
            9 => RaftError::VoteNotAllow,
            10 => RaftError::TypeErr,
            11 => RaftError::RaftNotFound(read_u64_slice(data, 1)),
            12 => RaftError::NotLeader(read_u64_slice(data, 1)),
            13 => RaftError::LogFileNotFound(read_u64_slice(data, 1)),
            14 => RaftError::LogFileInvalid(read_u64_slice(data, 1)),
            15 => RaftError::Timeout(read_u64_slice(data, 1)),
            16 => RaftError::IncompleteErr(read_u64_slice(data, 1)),
            17 => RaftError::NotReady,
            18 => RaftError::NotEnoughRecipient(read_u16_slice(data, 1), read_u16_slice(data, 3)),
            19 => RaftError::ErrCode(read_i32_slice(data, 1), read_string(data, 5)),
            20 => RaftError::OutMemIndex(read_u64_slice(data, 1)),
            _ => panic!("not found"),
        }
    }
}

fn read_string(data: &[u8], start: usize) -> String {
    String::from_utf8_lossy(&data[start..]).to_string()
}

fn read_u64_slice(s: &[u8], start: usize) -> u64 {
    let ptr = s[start..start + 8].as_ptr() as *const [u8; 8];
    u64::from_be_bytes(unsafe { *ptr })
}

fn read_i32_slice(s: &[u8], start: usize) -> i32 {
    let ptr = s[start..start + 4].as_ptr() as *const [u8; 4];
    i32::from_be_bytes(unsafe { *ptr })
}

fn read_u16_slice(s: &[u8], start: usize) -> u16 {
    let ptr = s[start..start + 2].as_ptr() as *const [u8; 2];
    u16::from_be_bytes(unsafe { *ptr })
}

#[test]
fn get() {
    println!("{:?}", u32::to_be_bytes(1));
}