erl_dist 0.8.0

Rust Implementation of Erlang Distribution Protocol
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
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

use crate::term::{Mfa, PidOrAtom};
use eetf::{Atom, DecodeError, FixInteger, List, Pid, Reference, Term, Tuple};

pub fn nil() -> Term {
    eetf::List::nil().into()
}

pub fn check_tuple_len(tuple: &Tuple, n: usize) -> Result<(), DecodeError> {
    if tuple.elements.len() != n {
        Err(DecodeError::UnexpectedType {
            value: tuple.clone().into(),
            expected: format!("{} elements tuple", n),
        })
    } else {
        Ok(())
    }
}

pub fn try_from_tagged_tuple3<T0, T1>(mut tuple: Tuple) -> Result<(T0, T1), DecodeError>
where
    T0: TryFromTerm,
    T1: TryFromTerm,
{
    check_tuple_len(&tuple, 3)?;
    Ok((
        T0::try_from_term(std::mem::replace(&mut tuple.elements[1], nil()))?,
        T1::try_from_term(std::mem::replace(&mut tuple.elements[2], nil()))?,
    ))
}

pub fn try_from_tagged_tuple4<T0, T1, T2>(mut tuple: Tuple) -> Result<(T0, T1, T2), DecodeError>
where
    T0: TryFromTerm,
    T1: TryFromTerm,
    T2: TryFromTerm,
{
    check_tuple_len(&tuple, 4)?;
    Ok((
        T0::try_from_term(std::mem::replace(&mut tuple.elements[1], nil()))?,
        T1::try_from_term(std::mem::replace(&mut tuple.elements[2], nil()))?,
        T2::try_from_term(std::mem::replace(&mut tuple.elements[3], nil()))?,
    ))
}

pub fn try_from_tagged_tuple5<T0, T1, T2, T3>(
    mut tuple: Tuple,
) -> Result<(T0, T1, T2, T3), DecodeError>
where
    T0: TryFromTerm,
    T1: TryFromTerm,
    T2: TryFromTerm,
    T3: TryFromTerm,
{
    check_tuple_len(&tuple, 5)?;
    Ok((
        T0::try_from_term(std::mem::replace(&mut tuple.elements[1], nil()))?,
        T1::try_from_term(std::mem::replace(&mut tuple.elements[2], nil()))?,
        T2::try_from_term(std::mem::replace(&mut tuple.elements[3], nil()))?,
        T3::try_from_term(std::mem::replace(&mut tuple.elements[4], nil()))?,
    ))
}

pub fn try_from_tagged_tuple6<T0, T1, T2, T3, T4>(
    mut tuple: Tuple,
) -> Result<(T0, T1, T2, T3, T4), DecodeError>
where
    T0: TryFromTerm,
    T1: TryFromTerm,
    T2: TryFromTerm,
    T3: TryFromTerm,
    T4: TryFromTerm,
{
    check_tuple_len(&tuple, 6)?;
    Ok((
        T0::try_from_term(std::mem::replace(&mut tuple.elements[1], nil()))?,
        T1::try_from_term(std::mem::replace(&mut tuple.elements[2], nil()))?,
        T2::try_from_term(std::mem::replace(&mut tuple.elements[3], nil()))?,
        T3::try_from_term(std::mem::replace(&mut tuple.elements[4], nil()))?,
        T4::try_from_term(std::mem::replace(&mut tuple.elements[5], nil()))?,
    ))
}

pub fn try_from_tagged_tuple7<T0, T1, T2, T3, T4, T5>(
    mut tuple: Tuple,
) -> Result<(T0, T1, T2, T3, T4, T5), DecodeError>
where
    T0: TryFromTerm,
    T1: TryFromTerm,
    T2: TryFromTerm,
    T3: TryFromTerm,
    T4: TryFromTerm,
    T5: TryFromTerm,
{
    check_tuple_len(&tuple, 7)?;
    Ok((
        T0::try_from_term(std::mem::replace(&mut tuple.elements[1], nil()))?,
        T1::try_from_term(std::mem::replace(&mut tuple.elements[2], nil()))?,
        T2::try_from_term(std::mem::replace(&mut tuple.elements[3], nil()))?,
        T3::try_from_term(std::mem::replace(&mut tuple.elements[4], nil()))?,
        T4::try_from_term(std::mem::replace(&mut tuple.elements[5], nil()))?,
        T5::try_from_term(std::mem::replace(&mut tuple.elements[6], nil()))?,
    ))
}

pub trait TryFromTerm: Sized {
    fn try_from_term(term: Term) -> Result<Self, DecodeError>;
}

impl TryFromTerm for Term {
    fn try_from_term(term: Term) -> Result<Self, DecodeError> {
        Ok(term)
    }
}

impl TryFromTerm for Pid {
    fn try_from_term(term: Term) -> Result<Self, DecodeError> {
        try_from_term(term, "pid")
    }
}

impl TryFromTerm for Atom {
    fn try_from_term(term: Term) -> Result<Self, DecodeError> {
        try_from_term(term, "atom")
    }
}

impl TryFromTerm for Reference {
    fn try_from_term(term: Term) -> Result<Self, DecodeError> {
        try_from_term(term, "reference")
    }
}

impl TryFromTerm for FixInteger {
    fn try_from_term(term: Term) -> Result<Self, DecodeError> {
        try_from_term(term, "integer")
    }
}

impl TryFromTerm for List {
    fn try_from_term(term: Term) -> Result<Self, DecodeError> {
        try_from_term(term, "list")
    }
}

impl TryFromTerm for PidOrAtom {
    fn try_from_term(term: Term) -> Result<Self, DecodeError> {
        term.try_into()
            .map(Self::Pid)
            .or_else(|term| term.try_into().map(Self::Atom))
            .map_err(|value| DecodeError::UnexpectedType {
                value,
                expected: "pid or atom".to_owned(),
            })
    }
}

impl TryFromTerm for Mfa {
    fn try_from_term(term: Term) -> Result<Self, DecodeError> {
        let mut tuple = try_from_term(term, "tuple")?;
        check_tuple_len(&tuple, 3)?;
        Ok(Self {
            module: TryFromTerm::try_from_term(std::mem::replace(&mut tuple.elements[0], nil()))?,
            function: TryFromTerm::try_from_term(std::mem::replace(&mut tuple.elements[1], nil()))?,
            arity: TryFromTerm::try_from_term(std::mem::replace(&mut tuple.elements[2], nil()))?,
        })
    }
}

pub fn try_from_term<T>(term: Term, expected: &str) -> Result<T, DecodeError>
where
    Term: TryInto<T, Error = Term>,
{
    term.try_into()
        .map_err(|value| DecodeError::UnexpectedType {
            value,
            expected: expected.to_owned(),
        })
}