feat: add Metadata.findDataByOwner

[solberenson]

A findByOwner implementation that uses batched calls to
getMultipleAccountsInfo (via Account.getInfos) instead of
individual calls to getProgramAccounts per address.

Notes:

• amount?.toNumber() has been replaced with a direct comparison using BN.js operations as BN.toNumber is limited to 53 bits and some instances where it overflowed were encountered.
• the return type is MetadataData[] instead of Metadata[] like the existing findByOwner functions

[kespinola]

Excited or this one. Currently, Metaplex storefronts lean on this account provider which subscripts to all the token accounts owned by the logged-in user. This opens up a lot of connections to the WS endpoint of the RPC server which isn't well optimized for heavy use of subscriptions.

https://github.com/metaplex-foundation/metaplex/blob/master/js/packages/common/src/contexts/accounts/accounts.tsx#L123

[vpontis]

Hmm, are there plans to improve this? This call does Promise.all without any limiting — that means for a large wallet this could send 100+ network requests at once which could take down the client / server.

I've used p-limit to get around this.

But an even nicer solution would be to use something like Solana JSON RPC's getMultipleAccounts and then to be smart about parsing the data on each account.

[solberenson]

Hmm, are there plans to improve this? This call does Promise.all without any limiting — that means for a large wallet this could send 100+ network requests at once which could take down the client / server.

I've used p-limit to get around this.

But an even nicer solution would be to use something like Solana JSON RPC's getMultipleAccounts and then to be smart about parsing the data on each account.

Apologies for the delayed response, I haven't looked at this since it was merged.

This solution already uses getMultipleAccountsInfo in batches of 99-100 via Account.getInfos.

It makes:

• a single call to getTokenAccountsByOwner
• one call to getMultipleAccountsInfo per 100 metadata accounts

The Promise.all is for deriving the metadata addresses; these do not result in network calls.