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DeFiActionsUtils

import FungibleToken from 0xf233dcee88fe0abe /// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! /// THIS CONTRACT IS IN BETA AND IS NOT FINALIZED - INTERFACES MAY CHANGE AND/OR PENDING CHANGES MAY REQUIRE REDEPLOYMENT /// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! /// /// DeFiActionsUtils /// /// Utility methods commonly used across DeFiActions related contracts /// access(all) contract DeFiActionsUtils { /// Checks that the contract defining vaultType conforms to the FungibleToken contract interface. This is required /// to source empty Vaults in the event inner Capabilities become invalid /// /// @param vaultType: The Type of the Vault in question /// /// @return true if the Type a Vault and is defined by a FungibleToken contract, false otherwise /// access(all) view fun definingContractIsFungibleToken(_ vaultType: Type): Bool { if !vaultType.isSubtype(of: Type<@{FungibleToken.Vault}>()) { return false } return getAccount(vaultType.address!).contracts.borrow<&{FungibleToken}>(name: vaultType.contractName!) != nil } /// Returns an empty Vault of the given Type. Reverts if the provided Type is not defined by a FungibleToken /// or if the returned Vault is not of the requested Type. Callers can use .definingContractIsFungibleToken() /// to check the type before calling if they would like to prevent reverting. /// /// @param vaultType: The Type of the Vault to return as an empty Vault /// /// @return an empty Vault of the requested Type /// access(all) fun getEmptyVault(_ vaultType: Type): @{FungibleToken.Vault} { pre { self.definingContractIsFungibleToken(vaultType): "Invalid vault Type \(vaultType.identifier) requested - cannot create an empty Vault of an invalid type" } post { result.getType() == vaultType: "Invalid Vault returned - expected \(vaultType.identifier) but returned \(result.getType().identifier)" } return <- getAccount(vaultType.address!) .contracts .borrow<&{FungibleToken}>(name: vaultType.contractName!)! .createEmptyVault(vaultType: vaultType) } }