Is it possible to make multiple function calls in a single transaction?

Question

Say I want to make a transaction that calls foo() and the calls bar() afterwards. I could make a contract that calls them both in sequence, but that's kind of a pain. Is there a way to just call both without prompting the user for multiple signatures? And if so will foo() revert if bar() reverts and vice versa?

score 7 · Accepted Answer · answered Apr 15 '19 at 14:05

7

There is no way to do this without using a contract.

In general, due to Ethereum's "no features" design principle, anything more complex than a simple transaction will require a smart contract. In this case the contract would be very small, and you can simply deploy it once and reuse it.

answered Apr 15 '19 at 14:05

Tjaden Hess

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So even the BatchRequest is not atomic? https://web3js.readthedocs.io/en/v1.2.11/web3-eth.html#batchrequest – jerryleooo Feb 20 '22 at 14:27
2

That simply batches requests from the web3 insurance to the backing node/provider. The requests are still sent to the network separately and are not atomic – Tjaden Hess Feb 20 '22 at 22:36

score 3 · Answer 2 · answered Apr 15 '19 at 14:25

You may call all in one transaction by deploying contract looking like this:

contract Target {
    function foo () public;
    function bar () public;
}

contract Batch {
  constructor (Target target) public {
    target.foo ();
    target.bar ();
    selfdestruct (msg.sender);
  }
}

This will revert foo() in case bar() will fail.

Though, this will call foo() and bar() from temporary smart contract address rather than from your real address.

score 1 · Answer 3 · answered Apr 15 '19 at 14:09

The user signs one transaction. It can involve many contracts and functions, according to design. It will also be atomic - completing or reverting entirely.

There is no way to have the user sign two such transactions or receive the same assurances about two separately signed transactions.

Hope it helps.

Is it possible to make multiple function calls in a single transaction?

3 Answers3