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Merge rust-bitcoin/rust-bitcoin#2846: generate Network <-> Magic From and TryFrom with a macro 

76826313a1 generate Network <-> Magic From and TryFrom with a macro (Antoni Spaanderman)

Pull request description:

  Removes possible errors when a network is added to the enum (expressed with the comment `// Note: new network entries must explicitly be matched in 'try_from' below.`)

ACKs for top commit:
  Kixunil:
    ACK 76826313a1
  apoelstra:
    ACK 76826313a1

Tree-SHA512: 37aaf4b9021204c24e3dc405e666f3dea8c4f8e478b26892dd962a49c988904ba02c3dee7cec1ad78d4e4bb9ba9565ec4574d0e169dd215d26b010f1c4dd3d0b
This commit is contained in:
Andrew Poelstra 2024-06-10 13:24:56 +00:00
parent 4543309518 76826313a1
commit f934132b3b
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1 changed files with 29 additions and 22 deletions
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51
bitcoin/src/p2p/mod.rs
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@ -243,31 +243,38 @@ impl FromStr for Magic {
} }
} }
impl From<Network> for Magic { macro_rules! generate_network_magic_conversion {
fn from(network: Network) -> Magic { ($(Network::$network:ident => Magic::$magic:ident,)*) => {
match network { impl From<Network> for Magic {
// Note: new network entries must explicitly be matched in `try_from` below. fn from(network: Network) -> Magic {
Network::Bitcoin => Magic::BITCOIN, match network {
Network::Testnet => Magic::TESTNET, $(
Network::Signet => Magic::SIGNET, Network::$network => Magic::$magic,
Network::Regtest => Magic::REGTEST, )*
}
}
} }
}
impl TryFrom<Magic> for Network {
type Error = UnknownMagicError;
fn try_from(magic: Magic) -> Result<Self, Self::Error> {
match magic {
$(
Magic::$magic => Ok(Network::$network),
)*
_ => Err(UnknownMagicError(magic)),
}
}
}
};
} }
impl TryFrom<Magic> for Network { generate_network_magic_conversion! {
type Error = UnknownMagicError; Network::Bitcoin => Magic::BITCOIN,
Network::Testnet => Magic::TESTNET,
fn try_from(magic: Magic) -> Result<Self, Self::Error> { Network::Signet => Magic::SIGNET,
match magic { Network::Regtest => Magic::REGTEST,
// Note: any new network entries must be matched against here.
Magic::BITCOIN => Ok(Network::Bitcoin),
Magic::TESTNET => Ok(Network::Testnet),
Magic::SIGNET => Ok(Network::Signet),
Magic::REGTEST => Ok(Network::Regtest),
_ => Err(UnknownMagicError(magic)),
}
}
} }
impl fmt::Display for Magic { impl fmt::Display for Magic {