71 lines
1.5 KiB
Rust
71 lines
1.5 KiB
Rust
//! EVM call types.
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use rlp::{Encodable, Decodable, DecoderError, RlpStream, UntrustedRlp};
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/// The type of the call-like instruction.
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#[derive(Debug, PartialEq, Clone)]
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pub enum CallType {
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/// Not a CALL.
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None,
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/// CALL.
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Call,
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/// CALLCODE.
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CallCode,
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/// DELEGATECALL.
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DelegateCall,
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/// STATICCALL
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StaticCall,
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}
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impl Encodable for CallType {
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fn rlp_append(&self, s: &mut RlpStream) {
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let v = match *self {
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CallType::None => 0u32,
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CallType::Call => 1,
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CallType::CallCode => 2,
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CallType::DelegateCall => 3,
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CallType::StaticCall => 4,
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};
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Encodable::rlp_append(&v, s);
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}
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}
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impl Decodable for CallType {
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fn decode(rlp: &UntrustedRlp) -> Result<Self, DecoderError> {
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rlp.as_val().and_then(|v| Ok(match v {
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0u32 => CallType::None,
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1 => CallType::Call,
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2 => CallType::CallCode,
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3 => CallType::DelegateCall,
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4 => CallType::StaticCall,
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_ => return Err(DecoderError::Custom("Invalid value of CallType item")),
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}))
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}
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}
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#[cfg(test)]
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mod tests {
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use rlp::*;
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use super::CallType;
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#[test]
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fn encode_call_type() {
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let ct = CallType::Call;
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let mut s = RlpStream::new_list(2);
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s.append(&ct);
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assert!(!s.is_finished(), "List shouldn't finished yet");
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s.append(&ct);
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assert!(s.is_finished(), "List should be finished now");
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s.out();
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}
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#[test]
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fn should_encode_and_decode_call_type() {
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let original = CallType::Call;
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let encoded = encode(&original);
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let decoded = decode(&encoded);
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assert_eq!(original, decoded);
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}
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}
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