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

//! This module implements extensions to the [`ethabi`](https://docs.rs/ethabi) API.
// Adapted from [Gnosis' ethcontract](https://github.com/gnosis/ethcontract-rs/blob/master/common/src/abiext.rs)
use crate::{types::Selector, utils::id};

pub use ethabi::Contract as Abi;
pub use ethabi::*;

mod tokens;
pub use tokens::{Detokenize, InvalidOutputType, Tokenizable, TokenizableItem, Tokenize};

pub mod struct_def;
pub use struct_def::SolStruct;

mod error;
pub use error::ParseError;

mod human_readable;
pub use human_readable::{parse as parse_abi, parse_str as parse_abi_str, AbiParser};

/// Extension trait for `ethabi::Function`.
pub trait FunctionExt {
    /// Compute the method signature in the standard ABI format. This does not
    /// include the output types.
    fn abi_signature(&self) -> String;

    /// Compute the Keccak256 function selector used by contract ABIs.
    fn selector(&self) -> Selector;
}

impl FunctionExt for Function {
    fn abi_signature(&self) -> String {
        let mut full_signature = self.signature();
        if let Some(colon) = full_signature.find(':') {
            full_signature.truncate(colon);
        }

        full_signature
    }

    fn selector(&self) -> Selector {
        id(self.abi_signature())
    }
}

/// Extension trait for `ethabi::Event`.
pub trait EventExt {
    /// Compute the event signature in human-readable format. The `keccak256`
    /// hash of this value is the actual event signature that is used as topic0
    /// in the transaction logs.
    fn abi_signature(&self) -> String;
}

impl EventExt for Event {
    fn abi_signature(&self) -> String {
        format!(
            "{}({}){}",
            self.name,
            self.inputs
                .iter()
                .map(|input| input.kind.to_string())
                .collect::<Vec<_>>()
                .join(","),
            if self.anonymous { " anonymous" } else { "" },
        )
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn format_function_signature() {
        for (f, expected) in &[
            (
                r#"{"name":"foo","inputs":[],"outputs":[], "stateMutability": "nonpayable"}"#,
                "foo()",
            ),
            (
                r#"{"name":"bar","inputs":[{"name":"a","type":"uint256"},{"name":"b","type":"bool"}],"outputs":[], "stateMutability": "nonpayable"}"#,
                "bar(uint256,bool)",
            ),
            (
                r#"{"name":"baz","inputs":[{"name":"a","type":"uint256"}],"outputs":[{"name":"b","type":"bool"}], "stateMutability": "nonpayable"}"#,
                "baz(uint256)",
            ),
            (
                r#"{"name":"bax","inputs":[],"outputs":[{"name":"a","type":"uint256"},{"name":"b","type":"bool"}], "stateMutability": "nonpayable"}"#,
                "bax()",
            ),
        ] {
            let function: Function = serde_json::from_str(f).expect("invalid function JSON");
            let signature = function.abi_signature();
            assert_eq!(signature, *expected);
        }
    }

    #[test]
    fn format_event_signature() {
        for (e, expected) in &[
            (r#"{"name":"foo","inputs":[],"anonymous":false}"#, "foo()"),
            (
                r#"{"name":"bar","inputs":[{"name":"a","type":"uint256"},{"name":"b","type":"bool"}],"anonymous":false}"#,
                "bar(uint256,bool)",
            ),
            (
                r#"{"name":"baz","inputs":[{"name":"a","type":"uint256"}],"anonymous":true}"#,
                "baz(uint256) anonymous",
            ),
            (
                r#"{"name":"bax","inputs":[],"anonymous":true}"#,
                "bax() anonymous",
            ),
        ] {
            let event: Event = serde_json::from_str(e).expect("invalid event JSON");
            let signature = event.abi_signature();
            assert_eq!(signature, *expected);
        }
    }
}