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I want to access a specific pallet's storage item (for example: a StorageMap or StorageValue) in the function <Runtime as TaggedTransactionQueue<Block>::validate_transaction() (note: this function is found in runtime/src/lib.rs FYI).
Therefore, I am wondering, is it possible to access the value of a pallet's storage item outside of the pallet and in runtime/src/lib.rs (specifically in <Runtime as TaggedTransactionQueue<Block>::validate_transaction()) itself? Thanks
@shawn-tabrizi :)
Yes that is possible. validate_transaction will be called in the context of some block and in this context you can read the pallet storage items.
While you can read storage items, you also need to ensure that you are staying in certain limits. For example you should not do any kind of storage iteration. The problem with all this is that every node will call validate_transaction before adding a transaction to the tx-pool and also when the transaction is in the pool to check if it is still valid. All these operations are "free" and make it possible to dos your node. So, ensure that you are not doing too many storage reads or doing too many calculations.
block_hash parameter?
block_hash parameter"?
let DummyStorageNumber = StorageValue<_, u64, ValueQuery>. How do I access the value of DummyStorageNumber in <Runtime as TaggedTransactionQueue<Block>>::validate_transaction(source, tx, block_hash)? Thanks
<Runtime as TaggedTransactionQueue<Block>::validate_transaction() and when it is appropriate to use frame_system::Config::BaseCallFilter to filter/validate transactions? Thanks again!