APplying review fixes.

Author: yaroslavyaroslav

Sources/Core/Oracle/GasOracle.swift

@@ -136,8 +136,7 @@ final public class Oracle {
             let block: BigUInt = try await combineRequest(request: .blockNumber)
             latestBlockNumber = block
         case let .exact(number): latestBlockNumber = number
-            // Error throws since pending and erliest are unable to be used in this method.
-        default: throw Web3Error.valueError()
+        default: throw Web3Error.valueError(desc: "Unable to use '\(block)' policy to resolve block number to calculate gas fee suggestion.")
         }
 
         /// checking if latest block number is greather than number of blocks to take in account

Sources/Core/Transaction/Policies.swift

@@ -53,5 +53,5 @@ public struct Policies {
             self.maxPriorityFeePerGasPolicy = maxPriorityFeePerGasPolicy
         }
 
-    public private(set) static var auto = Policies()
+    public static let auto = Policies()
 }

Sources/web3swift/Operations/ReadOperation.swift

@@ -36,7 +36,6 @@ public class ReadOperation {
 
     // TODO: Remove type erasing here, some broad wide protocol should be added instead
     public func callContractMethod() async throws -> [String: Any] {
-        try await policyResolver.resolveAll(for: &transaction)
         // MARK: Read data from ABI flow
         // FIXME: This should be dropped, and after `execute()` call, just to decode raw data.
         let data: Data = try await self.web3.eth.callTransaction(transaction)

Sources/web3swift/Web3/Web3+Resolver.swift

@@ -36,10 +36,9 @@ public class PolicyResolver {
     }
 
     public func resolveGasBaseFee(for policy: FeePerGasPolicy) async -> BigUInt {
-        let oracle = Oracle(provider)
         switch policy {
         case .automatic:
-            return await oracle.baseFeePercentiles().max() ?? 0
+            return await Oracle(provider).baseFeePercentiles().max() ?? 0
         case .manual(let value):
             return value
         }
@@ -62,20 +61,18 @@ public class PolicyResolver {
     }
 
     public func resolveGasPrice(for policy: GasPricePolicy) async -> BigUInt {
-        let oracle = Oracle(provider)
         switch policy {
         case .automatic, .withMargin:
-            return await oracle.gasPriceLegacyPercentiles().max() ?? 0
+            return await Oracle(provider).gasPriceLegacyPercentiles().max() ?? 0
         case .manual(let value):
             return value
         }
     }
 
     public func resolveGasPriorityFee(for policy: PriorityFeePerGasPolicy) async -> BigUInt {
-        let oracle = Oracle(provider)
         switch policy {
         case .automatic:
-            return await oracle.tipFeePercentiles().max() ?? 0
+            return await Oracle(provider).tipFeePercentiles().max() ?? 0
         case .manual(let value):
             return value
         }