decode method

Author: yuzhiyou1990

Sources/TronWebSwift/Contracts/TronContract.swift

@@ -107,5 +107,17 @@ public struct TronContract: TronContractProtocol {
         guard case .function(_) = function else {return nil}
         return function.decodeReturnData(data)
     }
+    
+    public func decodeMethodData(_ data: Data) -> (method: String, inputs: [String : Any]?)? {
+        guard data.count >= 4 else { return nil }
+        let methods = methods.compactMap { (_, value) in
+            if case .function(let f) = value, f.methodEncoding == data.subdata(in: 0..<4) {
+                return (f.signature, value)
+            }
+            return nil
+        }
+        guard let method = methods.first else { return nil }
+        return (method.0, method.1.decodeInputData(data) ?? [:])
+    }
 }
 

Tests/TronWebSwiftTests/TronWebTests.swift

@@ -204,15 +204,10 @@ class TronWebTests: XCTestCase {
         debugPrint(human)
     }
 
-    func testDecodeInputDataExample() throws {
+    func testDecodeMethodDataExample() throws {
         guard let tronContract = TronContract(TronWeb.Utils.trc20ABI, at: nil) else { return }
-        let method = "transfer"
-        guard let function = tronContract.methods[method] else { return }
-        guard case .function(_) = function else { return}
-        // a9059cbb
-        // 00000000000000000000004141a768c9797b8b1a1d41d25ba603f68326fcfc40
-        // 00000000000000000000000000000000000000000000000000000000000186a0
-        let returns = function.decodeInputData(Data(hex: "a9059cbb00000000000000000000004141a768c9797b8b1a1d41d25ba603f68326fcfc4000000000000000000000000000000000000000000000000000000000000186a0"))
-        debugPrint(returns ?? [:])
+        let returns = tronContract.decodeMethodData(Data(hex: "a9059cbb00000000000000000000004141a768c9797b8b1a1d41d25ba603f68326fcfc4000000000000000000000000000000000000000000000000000000000000186a0"))
+        XCTAssertTrue(returns?.method == "transfer(address,uint256)")
+        XCTAssertTrue(returns?.inputs?["_value"] as? BigUInt == BigUInt("100000"))
     }
 }