Delete duplicate BlockNumber enum in FeeHistory.

Author: yaroslavyaroslav

Sources/web3swift/Web3/Web3+GasOracle.swift

@@ -89,7 +89,7 @@ extension Web3 {
             // TODO: Disabled until 3.0 version, coz `distance` available from iOS 13.
 //            guard feeHistory == nil, forceDropCache, feeHistory!.timestamp.distance(to: Date()) > cacheTimeout else { return feeHistory! }
 
-            return try await eth.feeHistory(blockCount: blockCount, block: block.hexValue, percentiles: percentiles)
+            return try await eth.feeHistory(blockCount: blockCount, block: block.stringValue, percentiles: percentiles)
         }
 
         /// Suggesting tip values
@@ -126,6 +126,9 @@ extension Web3 {
             switch block {
             case .latest: latestBlockNumber = try await eth.getBlockNumber()
             case let .exact(number): latestBlockNumber = number
+            // FIXME: Make real error here
+                // Error throws since pending and erliest are unable to be used in this method.
+            default: throw Web3Error.unknownError
             }
 
             /// checking if latest block number is greather than number of blocks to take in account
@@ -242,24 +245,3 @@ extension Web3.Oracle.FeeHistory: Decodable {
         self.reward = try values.decodeHex([[BigUInt]].self, forKey: .reward)
     }
 }
-
-
-public extension Web3 {
-    /// Enum for convenient type safe work with block number
-    enum BlockNumber {
-        /// Latest block of a chain
-        case latest
-        /// Exact block number
-        case exact(BigUInt)
-
-        /// Block number as a string
-        ///
-        /// Could be `hexString` either `latest`
-        internal var hexValue: String {
-            switch self {
-            case .latest: return "latest"
-            case let .exact(number): return String(number, radix: 16).addHexPrefix()
-            }
-        }
-    }
-}

Sources/web3swift/Web3/Web3+InfuraProviders.swift

@@ -9,10 +9,14 @@ import Starscream
 
 public enum BlockNumber {
     case pending
+    /// Latest block of a chain
     case latest
+    /// Earliest block of a chain
     case earliest
+    /// Exact block number
     case exact(BigUInt)
 
+    /// Block number as a hex string
     public var stringValue: String {
         switch self {
         case .pending: