forked from cerc-io/laconicd-deprecated
65 lines
3.4 KiB
Markdown
65 lines
3.4 KiB
Markdown
# Transactions
|
|
|
|
> NOTE: The specification documented below is still highly active in development
|
|
and subject to change.
|
|
|
|
## Routing
|
|
|
|
Ethermint needs to parse and handle transactions routed for both the EVM and for
|
|
the Cosmos hub. We attempt to achieve this by mimicking [Geth's](https://github.com/ethereum/go-ethereum) `Transaction` structure and utilizing
|
|
the `Payload` as the potential encoding of a Cosmos-routed transaction. What
|
|
designates this encoding, and ultimately routing, is the `Recipient` address --
|
|
if this address matches some global unique predefined and configured address,
|
|
we regard it as a transaction meant for Cosmos, otherwise, the transaction is a
|
|
pure Ethereum transaction and will be executed in the EVM.
|
|
|
|
For Cosmos routed transactions, the `Transaction.Payload` will contain an [Amino](https://github.com/tendermint/go-amino) encoded embedded transaction that must
|
|
implement the `sdk.Tx` interface. Note, the embedding (outer) `Transaction` is
|
|
still RLP encoded in order to preserve compatibility with existing tooling. In
|
|
addition, at launch, Ethermint will only support the `auth.StdTx` embedded Cosmos
|
|
transaction type.
|
|
|
|
Being that Ethermint implements the Tendermint ABCI application interface, as
|
|
transactions are consumed, they are passed through a series of handlers. Once such
|
|
handler, `runTx`, is responsible for invoking the `TxDecoder` which performs the
|
|
business logic of properly deserializing raw transaction bytes into either an
|
|
Ethereum transaction or a Cosmos transaction.
|
|
|
|
__Note__: Our goal is to utilize Geth as a library, at least as much as possible,
|
|
so it should be expected that these types and the operations you may perform on
|
|
them will keep in line with Ethereum (e.g. signature algorithms and gas/fees).
|
|
In addition, we aim to have existing tooling and frameworks in the Ethereum
|
|
ecosystem have 100% compatibility with creating transactions in Ethermint.
|
|
|
|
## Transactions & Messages
|
|
|
|
The SDK distinguishes between transactions (`sdk.Tx`) and messages (`sdk.Msg`).
|
|
A `sdk.Tx` is a list of `sdk.Msg` wrapped with authentication and fee data. Users
|
|
can create messages containing arbitrary information by implementing the `sdk.Msg`
|
|
interface.
|
|
|
|
In Ethermint, the `Transaction` type implements the Cosmos SDK `sdk.Tx` interface.
|
|
It addition, it implements the Cosmos SDK `sdk.Msg` interface for the sole purpose
|
|
of being to perform basic validation checks in the `BaseApp`. It, however, has
|
|
no distinction between transactions and messages.
|
|
|
|
## Signatures
|
|
|
|
Ethermint supports [EIP-155](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-155.md)
|
|
signatures. A `Transaction` is expected to have a single signature for Ethereum
|
|
routed transactions. However, just as in Cosmos, Ethermint will support multiple
|
|
signers for embedded Cosmos routed transactions. Signatures over the
|
|
`Transaction` type are identical to Ethereum. However, the embedded transaction contains
|
|
a canonical signature structure that contains the signature itself and other
|
|
information such as an account's sequence number. This, in addition to the chainID,
|
|
helps prevent "replay attacks", where the same message could be executed over and
|
|
over again.
|
|
|
|
An embedded transaction's list of signatures must much the unique list of addresses
|
|
returned by each message's `GetSigners` call. In addition, the address of first
|
|
signer of the embedded transaction is responsible for paying the fees.
|
|
|
|
## Gas & Fees
|
|
|
|
TODO
|