Event Decoding Additional Features

[sslivkoff]

event decoding checklist

• direct handling of u256 types
• display columns from event decoding in the initial schema summary printed when cryo starts
• ensure that consistent datatypes are used for decoded columns even when dataframe is empty

after those are complete:

• enable fetching event abi's from etherscan for easier input specification of event types
• add "json decoding mode" that decodes all event args as json
  • this will allow for decoding multiple event types in a single dataset

[007vasy]

the heimdall.rs repo have a quite nice recursive one for transactions:
https://github.com/Jon-Becker/heimdall-rs/blob/main/heimdall/src/decode/mod.rs#L65

the only thing missing as I see creating the JSON-likes structure with the names in the ABI

[007vasy]

@sslivkoff keep in mind that for event decoding there could be an event hash collision because:
event RandomEvent(indexed A, indexed B, indexed C)
has the same event hash as:

• event RandomEvent(A, B, C)
• event RandomEvent(indexed A, B, C)
• event RandomEvent(indexed A, indexed B, C)

[007vasy]

also I just found these:

• https://docs.rs/alloy-sol-types/latest/alloy_sol_types/
• https://github.com/rust-ethereum/ethabi