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fix: replace mainnet TTD so geth mainnet genesis parsing works (#5290)

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Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>
This commit is contained in:
Dan Cline
2023-11-04 02:08:30 -04:00
committed by GitHub
parent 88cf81feb1
commit cf1824989e
2 changed files with 52 additions and 5 deletions
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36
bin/reth/src/args/utils.rs
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@ -47,21 +47,47 @@ pub fn genesis_value_parser(s: &str) -> eyre::Result<Arc<ChainSpec>, eyre::Error
"holesky" => HOLESKY.clone(),
"dev" => DEV.clone(),
_ => {
// both serialized Genesis and ChainSpec structs supported
let genesis: AllGenesisFormats =
// try to read json from path first
// try to read json from path first
let mut raw =
match fs::read_to_string(PathBuf::from(shellexpand::full(s)?.into_owned())) {
Ok(raw) => serde_json::from_str(&raw)?,
Ok(raw) => raw,
Err(io_err) => {
// valid json may start with "\n", but must contain "{"
if s.contains('{') {
serde_json::from_str(s)?
s.to_string()
} else {
return Err(io_err.into()) // assume invalid path
}
}
};
// The ethereum mainnet TTD is 58750000000000000000000, and geth serializes this
// without quotes, because that is how golang `big.Int`s marshal in JSON. Numbers
// are arbitrary precision in JSON, so this is valid JSON. This number is also
// greater than a `u64`.
//
// Unfortunately, serde_json only supports parsing up to `u64`, resorting to `f64`
// once `u64` overflows:
// <https://github.com/serde-rs/json/blob/4bc1eaa03a6160593575bc9bc60c94dba4cab1e3/src/de.rs#L1411-L1415>
// <https://github.com/serde-rs/json/blob/4bc1eaa03a6160593575bc9bc60c94dba4cab1e3/src/de.rs#L479-L484>
// <https://github.com/serde-rs/json/blob/4bc1eaa03a6160593575bc9bc60c94dba4cab1e3/src/de.rs#L102-L108>
//
// serde_json does have an arbitrary precision feature, but this breaks untagged
// enums in serde:
// <https://github.com/serde-rs/serde/issues/2230>
// <https://github.com/serde-rs/serde/issues/1183>
//
// To solve this, we surround the mainnet TTD with quotes, which our custom Visitor
// accepts.
if raw.contains("58750000000000000000000") &&
!raw.contains("\"58750000000000000000000\"")
{
raw = raw.replacen("58750000000000000000000", "\"58750000000000000000000\"", 1);
}
// both serialized Genesis and ChainSpec structs supported
let genesis: AllGenesisFormats = serde_json::from_str(&raw)?;
Arc::new(genesis.into())
}
})