ckb_indexer_sync/
custom_filters.rs

1use ckb_types::{
2    core::BlockView,
3    packed::{Bytes, CellOutput},
4};
5use numext_fixed_uint::U256;
6use rhai::{AST, Engine, EvalAltResult, Scope};
7
8/// Custom filters
9///
10/// base on embedded scripting language Rhai
11pub struct CustomFilters {
12    engine: Engine,
13    block_filter: Option<AST>,
14    cell_filter: Option<AST>,
15}
16
17impl Clone for CustomFilters {
18    fn clone(&self) -> Self {
19        CustomFilters::from_filters(self.block_filter.clone(), self.cell_filter.clone())
20    }
21}
22
23fn to_uint(s: &str) -> Result<U256, Box<EvalAltResult>> {
24    match &s[..2] {
25        "0b" => U256::from_bin_str(&s[2..]),
26        "0o" => U256::from_oct_str(&s[2..]),
27        "0x" => U256::from_hex_str(&s[2..]),
28        _ => U256::from_dec_str(s),
29    }
30    .map_err(|e| e.to_string().into())
31}
32
33macro_rules! register_ops {
34    ($engine:ident $(, $op:tt)+ $(,)?) => {
35        $(
36            $engine.register_fn(stringify!($op), |a: U256, b: U256| a $op b);
37        )+
38    };
39}
40
41impl CustomFilters {
42    /// Construct new CustomFilters
43    pub fn new(block_filter_str: Option<&str>, cell_filter_str: Option<&str>) -> Self {
44        let mut engine = Engine::new();
45        engine.register_fn("to_uint", to_uint);
46        register_ops!(engine, +, -, *, /, %, ==, !=, <, <=, >, >=);
47
48        let block_filter = block_filter_str.map(|block_filter| {
49            engine
50                .compile(block_filter)
51                .expect("compile block_filter should be ok")
52        });
53        let cell_filter = cell_filter_str.map(|cell_filter| {
54            engine
55                .compile(cell_filter)
56                .expect("compile cell_filter should be ok")
57        });
58
59        Self {
60            engine,
61            block_filter,
62            cell_filter,
63        }
64    }
65
66    /// Construct new CustomFilters
67    pub fn from_filters(block_filter: Option<AST>, cell_filter: Option<AST>) -> Self {
68        let mut engine = Engine::new();
69        engine.register_fn("to_uint", to_uint);
70        register_ops!(engine, +, -, *, /, %, ==, !=, <, <=, >, >=);
71        Self {
72            engine,
73            block_filter,
74            cell_filter,
75        }
76    }
77
78    /// Returns true if the block filter is match
79    pub fn is_block_filter_match(&self, block: &BlockView) -> bool {
80        self.block_filter
81            .as_ref()
82            .map(|block_filter| {
83                let json_block: ckb_jsonrpc_types::BlockView = block.clone().into();
84                let parsed_block = self
85                    .engine
86                    .parse_json(serde_json::to_string(&json_block).unwrap(), true)
87                    .unwrap();
88                let mut scope = Scope::new();
89                scope.push("block", parsed_block);
90                self.engine
91                    .eval_ast_with_scope(&mut scope, block_filter)
92                    .expect("eval block_filter should be ok")
93            })
94            .unwrap_or(true)
95    }
96
97    /// Returns true if the cell filter is match
98    pub fn is_cell_filter_match(&self, output: &CellOutput, output_data: &Bytes) -> bool {
99        self.cell_filter
100            .as_ref()
101            .map(|cell_filter| {
102                let json_output: ckb_jsonrpc_types::CellOutput = output.clone().into();
103                let parsed_output = self
104                    .engine
105                    .parse_json(serde_json::to_string(&json_output).unwrap(), true)
106                    .unwrap();
107                let mut scope = Scope::new();
108                scope.push("output", parsed_output);
109                scope.push("output_data", format!("{output_data:#x}"));
110                self.engine
111                    .eval_ast_with_scope(&mut scope, cell_filter)
112                    .expect("eval cell_filter should be ok")
113            })
114            .unwrap_or(true)
115    }
116
117    /// check cell filter enabled
118    pub fn is_cell_filter_enabled(&self) -> bool {
119        self.cell_filter.is_some()
120    }
121}
ckb_indexer_sync/custom_filters.rs

ckb_indexer_sync/
custom_filters.rs
