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

use std::panic::{RefUnwindSafe, UnwindSafe};

use digest::Digest;
#[cfg(feature = "trace")]
use log::trace;
use rusqlite::functions::Context;
use rusqlite::ToSql;

#[cfg(feature = "aggregate")]
use crate::aggregate::create_agg_function;
use crate::rusqlite::functions::FunctionFlags;
use crate::rusqlite::types::{Type, ValueRef};
use crate::rusqlite::Error::{InvalidFunctionParameterType, InvalidParameterCount};
use crate::rusqlite::{Connection, Result};
use crate::state::HashState;

#[cfg(not(feature = "trace"))]
macro_rules! trace {
    ($($arg:tt)*) => {};
}

pub trait NamedDigest: Digest {
    fn name() -> &'static str;
}

macro_rules! digest_names {
    ($($typ:ty => $name:literal),* $(,)?) => {
        digest_names!(
            $(
                $typ => $name @ $name,
            )*
        );
    };
    ($($typ:ty => $name:literal @ $feature:literal),* $(,)?) => {
        $(
            #[cfg(feature = $feature)]
            impl NamedDigest for $typ {
                fn name() -> &'static str {
                    $name
                }
            }
        )*
    };
}

digest_names! {
    md5::Md5 => "md5",
    sha1::Sha1 => "sha1",
    sha2::Sha224 => "sha224",
    sha2::Sha256 => "sha256",
    sha2::Sha384 => "sha384",
    sha2::Sha512 => "sha512",
}

digest_names! {
    noncrypto_digests::Fnv => "fnv1a" @ "fnv",
    noncrypto_digests::Xxh32 => "xxh32" @ "xxhash",
    noncrypto_digests::Xxh64 => "xxh64" @ "xxhash",
    noncrypto_digests::Xxh3_64 => "xxh3_64" @ "xxhash",
    noncrypto_digests::Xxh3_128 => "xxh3_128" @ "xxhash",
}

pub(crate) fn create_hash_fn<T: NamedDigest + Clone + UnwindSafe + RefUnwindSafe + 'static>(
    conn: &Connection,
    fn_name: &str,
) -> Result<()> {
    create_scalar_function(conn, fn_name, |c| {
        hash_fn::<T>(
            c,
            #[cfg(feature = "trace")]
            "",
        )
        .map(HashState::finalize)
    })?;

    #[cfg(feature = "hex")]
    {
        let fn_name = format!("{fn_name}_hex");
        create_scalar_function(conn, &fn_name, |c| {
            hash_fn::<T>(
                c,
                #[cfg(feature = "trace")]
                "_hex",
            )
            .map(HashState::finalize_hex)
        })?;
    }

    #[cfg(feature = "aggregate")]
    {
        let fn_name = format!("{fn_name}_concat");
        create_agg_function(
            conn,
            &fn_name,
            crate::aggregate::AggType::<T, Vec<u8>>::new(
                #[cfg(any(feature = "window", feature = "trace"))]
                &fn_name,
                #[cfg(feature = "window")]
                HashState::calc,
                HashState::finalize,
            ),
        )?;
    }

    #[cfg(all(feature = "aggregate", feature = "hex"))]
    {
        let fn_name = format!("{fn_name}_concat_hex");
        create_agg_function(
            conn,
            &fn_name,
            crate::aggregate::AggType::<T, String>::new(
                #[cfg(any(feature = "window", feature = "trace"))]
                &fn_name,
                #[cfg(feature = "window")]
                HashState::calc_hex,
                HashState::finalize_hex,
            ),
        )?;
    }

    Ok(())
}

pub fn create_scalar_function<F, T>(conn: &Connection, fn_name: &str, function: F) -> Result<()>
where
    F: FnMut(&Context<'_>) -> Result<T> + Send + UnwindSafe + 'static,
    T: ToSql,
{
    trace!("Registering function {fn_name}");
    conn.create_scalar_function(
        fn_name,
        -1,
        FunctionFlags::SQLITE_UTF8
            | FunctionFlags::SQLITE_DETERMINISTIC
            | FunctionFlags::SQLITE_DIRECTONLY,
        function,
    )
}

fn hash_fn<T: NamedDigest + Clone + UnwindSafe + RefUnwindSafe + 'static>(
    ctx: &Context,
    #[cfg(feature = "trace")] suffix: &'static str,
) -> Result<HashState<T>> {
    let param_count = ctx.len();
    if param_count == 0 {
        return Err(InvalidParameterCount(param_count, 1));
    }
    let mut state = HashState::<T>::default();
    for idx in 0..param_count {
        let value = ctx.get_raw(idx);
        match value {
            ValueRef::Blob(val) => {
                trace!("{}{suffix}: hashing blob arg{idx}={val:?}", T::name());
                state.add_value(val);
            }
            ValueRef::Text(val) => {
                trace!("{}{suffix}: hashing text arg{idx}={val:?}", T::name());
                state.add_value(val);
            }
            ValueRef::Null => {
                trace!("{}{suffix}: ignoring arg{idx}=NULL", T::name());
                state.add_null();
            }
            #[allow(unused_variables)]
            ValueRef::Integer(val) => {
                trace!(
                    "{}{suffix}: unsupported Integer arg{idx}={val:?}",
                    T::name()
                );
                Err(InvalidFunctionParameterType(0, Type::Integer))?;
            }
            #[allow(unused_variables)]
            ValueRef::Real(val) => {
                trace!("{}{suffix}: unsupported Real arg{idx}={val:?}", T::name());
                Err(InvalidFunctionParameterType(0, Type::Real))?;
            }
        }
    }

    Ok(state)
}