feat: Update token balances controller for multichain #4782
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bergeron
commented
Oct 22, 2024
| @@ -319,7 +319,7 @@ export function divideIntoBatches<Value>( | |||
| } | |||
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| /** | |||
| * Constructs an object from processing batches of the given values | |||
| * Constructs a result from processing batches of the given values | |||
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I allowed this to reduce to something other than an object. In my case an array was useful. Saw no reason it couldn't be a non-object, same as a regular javascript reduce. Added tests.
bergeron
commented
Oct 22, 2024
| import { reduceInBatchesSerially } from './assetsUtil'; | ||
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| // https://github.com/mds1/multicall/blob/main/deployments.json | ||
| const MULTICALL_CONTRACT_BY_CHAINID = { |
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The multicall3 smart contract is introduced.
Simple but useful utility here. It accepts an array of calls, and executes them via a single RPC multicall if the chain supports it. And falls back to N requests otherwise.
I was initially using eth-balance-checker, but it was worse in 2 areas.
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It requires the same list of tokens to be checked across all accounts. Which can blow up into a lot of unnecessary checks. e.g. you're watching vitalik.eth and now you have to check 1000 tokens on every account.
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multicall3 is deployed on a lot more networks (~250)
bergeron
changed the title
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Explanation
Updates the
TokenBalancesControllerto be used across chains.It now extends
StaticIntervalPollingControllerso the new token based polling patterns can be used.The state now stores erc20 balances across all chains and accounts. It used to only store them for the current chain and current account.
erc20 balances are now fetched with a single RPC multicall across all accounts + tokens (on the ~250 chains that support the multicall3 contract). Instead of doing a
balanceOfrequest for each token like before.References
Changelog
@metamask/assets-controllersBREAKING: The
TokenBalancesControllerstate is now across all chains and accounts under the fieldtokenBalances, as a mapping from account address -> chain id -> token address -> balance.BREAKING: The
TokenBalancesControllernow extendsStaticIntervalPollingController, and the new polling APIstartPollingmust be used to initiate polling.Checklist