bwt 0.2.4

a lightweight hd wallet tracker and query engine for Bitcoin
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

// Syntactic sugar for a one-liner lazily-evaluated if expression
macro_rules! iif {
    ($cond:expr, $then:expr, $else:expr) => {
        if $cond {
            $then
        } else {
            $else
        }
    };
}

// Implements the Display and Serialize traits to format the struct as string
macro_rules! impl_string_serializer {
    ($name:ident, $var:ident, $expr:expr) => {
        impl std::fmt::Display for $name {
            fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
                let $var = self;
                f.write_str(&$expr)
            }
        }
        impl ::serde::Serialize for $name {
            fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
            where
                S: ::serde::Serializer,
            {
                let $var = self;
                serializer.collect_str(&$expr)
            }
        }
    };
}

// delegate Debug to Display
macro_rules! impl_debug_display {
    ($name:ident) => {
        impl std::fmt::Debug for $name {
            fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
                std::fmt::Display::fmt(self, f)
            }
        }
    };
}

macro_rules! ttl_cache {
    // cache a single value
    ($field:expr, $ttl:expr, $make_value:expr) => {
        ttl_cache!($field, $ttl, $make_value, x, &*x, |v| *x = Some(v));
    };

    // cache a hashmap indexed by $key
    ($field:expr, $ttl:expr, $make_value:expr, $key:expr) => {
        ttl_cache!($field, $ttl, $make_value, x, x.get(&$key), |v| x
            .insert($key, v));
    };

    ($field:expr, $ttl:expr, $make_value:expr, $cache:ident, $read_cache_item:expr, $write_cache_item:expr) => {
        // this comment intentionally left blank
        {
            let $cache = $field.read().unwrap();
            if let Some((cached_val, cached_time)) = $read_cache_item {
                if cached_time.elapsed() < $ttl {
                    return Ok(cached_val.clone());
                }
            }
        };

        let value = $make_value()?;
        let mut $cache = $field.write().unwrap();
        $write_cache_item((value.clone(), Instant::now()));

        return Ok(value);
    };
}

macro_rules! cache_forever {
    // cache a single value, only works with Copy
    ($field:expr, $make_value:expr) => {
        //
        {
            let cache = $field.read().unwrap();
            if let Some(cached_val) = *cache {
                return Ok(cached_val);
            }
        }
        let value = $make_value()?;
        *$field.write().unwrap() = Some(value);
        return Ok(value);
    };
}

macro_rules! some_or_ret {
    ($option:expr) => {
        some_or_ret!($option, ())
    };

    ($option:expr, $ret:expr) => {
        match $option {
            Some(x) => x,
            None => return $ret,
        }
    };
}

// Create a Default implementation that uses the default value for some fields,
// and custom values for others. From https://stackoverflow.com/a/60002926,
// enhanced with support for custom #[] attrs
macro_rules! defaultable{
    (
        $t: ty,
        @default($( $( #[$default_attrs:meta] )? $default_field:ident,)*)
        @custom($( $( #[$custom_attrs:meta] )? $custom_field:ident = $custom_value:expr,)*)
    )
    => {
    impl Default for $t {
        fn default() -> Self {
            Self {
                $( $( #[$default_attrs] )? $default_field: Default::default(),)*
                $( $( #[$custom_attrs] )? $custom_field: $custom_value,)*
            }
        }
    }
}}

// Construct an efficient balanced Or tree of warp filters
// From https://github.com/seanmonstar/warp/issues/619,
// which includes a commented version of this macro

#[cfg(feature = "http")]
macro_rules! balanced_or_tree {
    ($x:expr $(,)?) => { debug_boxed!($x) };
    ($($x:expr),+ $(,)?) => {
        balanced_or_tree!(@internal; $($x),+; $($x),+)
    };
    (@internal $($left:expr),*; $head:expr, $($tail:expr),+; $a:expr $(,$b:expr)?) => {
        (balanced_or_tree!($($left,)* $head)).or(balanced_or_tree!($($tail),+))
    };
    (@internal $($left:expr),*; $head:expr, $($tail:expr),+; $a:expr, $b:expr, $($more:expr),+) => {
        balanced_or_tree!(@internal $($left,)* $head; $($tail),+; $($more),+)
    };
}

// Box filters in debug mode to further improve build times
#[cfg(all(debug_assertions, feature = "http"))]
macro_rules! debug_boxed {
    ($x:expr) => {
        ::warp::Filter::boxed($x)
    };
}
#[cfg(all(not(debug_assertions), feature = "http"))]
macro_rules! debug_boxed {
    ($x:expr) => {
        $x
    };
}