Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Remove deprecated Kovan links from tutorial [Fixes #10383] #13275

Merged
merged 1 commit into from
Jul 2, 2024
Merged

Remove deprecated Kovan links from tutorial [Fixes #10383] #13275

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
27 changes: 0 additions & 27 deletions public/content/developers/tutorials/short-abi/index.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -51,7 +51,6 @@ The vast majority of transactions access a contract from an externally-owned acc
Most contracts are written in Solidity and interpret their data field per [the application binary interface (ABI)](https://docs.soliditylang.org/en/latest/abi-spec.html#formal-specification-of-the-encoding).

However, the ABI was designed for L1, where a byte of calldata costs approximately the same as four arithmetic operations, not L2 where a byte of calldata costs more than a thousand arithmetic operations.
For example, [here is an ERC-20 transfer transaction](https://kovan-optimistic.etherscan.io/tx/0x7ce4c144ebfce157b4de99d8ad53a352ae91b57b3fa06d8a1c79439df6bfa998).
The calldata is divided like this:

| Section | Length | Bytes | Wasted bytes | Wasted gas | Necessary bytes | Necessary gas |
Expand Down Expand Up @@ -98,8 +97,6 @@ It would make a production ERC-20 contract useless, but it makes life easier whe
} // function faucet
```

[You can see an example of this contract being deployed here](https://kovan-optimistic.etherscan.io/address/0x950c753c0edbde44a74d3793db738a318e9c8ce8).

### CalldataInterpreter.sol {#calldatainterpreter-sol}

[This is the contract that transactions are supposed to call with shorter calldata](https://github.com/qbzzt/ethereum.org-20220330-shortABI/blob/master/contracts/CalldataInterpreter.sol).
Expand Down Expand Up @@ -368,17 +365,6 @@ Create a transfer transaction. The first byte is "0x02", followed by the destina
}) // describe
```

### Example {#example}

If you want to see these files in action without running them yourself, follow these links:

1. [Deployment of `OrisUselessToken`](https://kovan-optimistic.etherscan.io/tx/1410744) to [address `0x950c753c0edbde44a74d3793db738a318e9c8ce8`](https://kovan-optimistic.etherscan.io/address/0x950c753c0edbde44a74d3793db738a318e9c8ce8).
2. [Deployment of `CalldataInterpreter`](https://kovan-optimistic.etherscan.io/tx/1410745) to [address `0x16617fea670aefe3b9051096c0eb4aeb4b3a5f55`](https://kovan-optimistic.etherscan.io/address/0x16617fea670aefe3b9051096c0eb4aeb4b3a5f55).
3. [Call to `faucet()`](https://kovan-optimistic.etherscan.io/tx/1410746).
4. [Call to `OrisUselessToken.approve()`](https://kovan-optimistic.etherscan.io/tx/1410747).
This call has to go directly to the token contract because the processing relies on `msg.sender`.
5. [Call to `transfer()`](https://kovan-optimistic.etherscan.io/tx/1410748).

## Reducing the cost when you do control the destination contract {#reducing-the-cost-when-you-do-control-the-destination-contract}

If you do have control over the destination contract you can create functions that bypass the `msg.sender` checks because they trust the calldata interpreter.
Expand Down Expand Up @@ -588,19 +574,6 @@ expect(await token.balanceOf(destAddr2)).to.equal(255)
Test the two new functions.
Note that `transferFromTx` requires two address parameters: the giver of the allowance and the receiver.

### Example {#example-2}

If you want to see these files in action without running them yourself, follow these links:

1. [Deployment of `OrisUselessToken-2`](https://kovan-optimistic.etherscan.io/tx/1475397) at address [`0xb47c1f550d8af70b339970c673bbdb2594011696`](https://kovan-optimistic.etherscan.io/address/0xb47c1f550d8af70b339970c673bbdb2594011696).
2. [Deployment of `CalldataInterpreter`](https://kovan-optimistic.etherscan.io/tx/1475400) at address [`0x0dccfd03e3aaba2f8c4ea4008487fd0380815892`](https://kovan-optimistic.etherscan.io/address/0x0dccfd03e3aaba2f8c4ea4008487fd0380815892).
3. [Call to `setProxy()`](https://kovan-optimistic.etherscan.io/tx/1475402).
4. [Call to `faucet()`](https://kovan-optimistic.etherscan.io/tx/1475409).
5. [Call to `transferProxy()`](https://kovan-optimistic.etherscan.io/tx/1475416).
6. [Call to `approveProxy()`](https://kovan-optimistic.etherscan.io/tx/1475419).
7. [Call to `transferFromProxy()`](https://kovan-optimistic.etherscan.io/tx/1475421).
Note that this call comes from a different address than the other ones, `poorSigner` instead of `signer`.

## Conclusion {#conclusion}

Both [Optimism](https://medium.com/ethereum-optimism/the-road-to-sub-dollar-transactions-part-2-compression-edition-6bb2890e3e92) and [Arbitrum](https://developer.offchainlabs.com/docs/special_features) are looking for ways to reduce the size of the calldata written to L1 and therefore the cost of transactions.
Expand Down
Loading