Eth JSON-RPC API: implement eth_getCode and eth_getStorageAt #9397
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This comes with a temporary hack. The EVM runtime actor uses the U256 parameter type in GetStorageAtParams, which serializes as a hex-encoded string. It should serialize as bytes. We didn't get to fix in time for Iron, so for now we just pass through the hex-encoded value passed through the Eth JSON-RPC API, by remarshalling it. We don't fix this at origin (builtin-actors) because we are not updating the bundle for Iron.
ychiaoli18
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eth_getStorageAt comes with a major hack for now because of a serde snafu in the EVM runtime in builtin-actors. We are not updating the bundle for Iron, so we patch it here. The type we used in the EVM runtime for the storage slot serializes to a hex-encoded int instead of to purely an big-endian array of bytes. We'll fix this at origin in builtin-actors.
Another caveat is that retrieving a storage key that doesn't exist returns an error. Instead, it should return a 0x0.