first commit of restructured project

trahn-trade-backend/internal/ethereum/abi.go

@@ -0,0 +1,74 @@
+package ethereum
+
+import (
+	"io"
+	"strings"
+)
+
+// Minimal ABIs for Uniswap V2 Router02 and ERC20 — only the methods we call.
+
+func mustRouterABI() io.Reader {
+	return strings.NewReader(`[
+		{
+			"name": "swapExactTokensForETH",
+			"type": "function",
+			"stateMutability": "nonpayable",
+			"inputs": [
+				{"name": "amountIn",      "type": "uint256"},
+				{"name": "amountOutMin",  "type": "uint256"},
+				{"name": "path",          "type": "address[]"},
+				{"name": "to",            "type": "address"},
+				{"name": "deadline",      "type": "uint256"}
+			],
+			"outputs": [
+				{"name": "amounts", "type": "uint256[]"}
+			]
+		},
+		{
+			"name": "swapExactETHForTokens",
+			"type": "function",
+			"stateMutability": "payable",
+			"inputs": [
+				{"name": "amountOutMin",  "type": "uint256"},
+				{"name": "path",          "type": "address[]"},
+				{"name": "to",            "type": "address"},
+				{"name": "deadline",      "type": "uint256"}
+			],
+			"outputs": [
+				{"name": "amounts", "type": "uint256[]"}
+			]
+		}
+	]`)
+}
+
+func mustERC20ABI() io.Reader {
+	return strings.NewReader(`[
+		{
+			"name": "balanceOf",
+			"type": "function",
+			"stateMutability": "view",
+			"inputs": [{"name": "_owner", "type": "address"}],
+			"outputs": [{"name": "balance", "type": "uint256"}]
+		},
+		{
+			"name": "allowance",
+			"type": "function",
+			"stateMutability": "view",
+			"inputs": [
+				{"name": "_owner",   "type": "address"},
+				{"name": "_spender", "type": "address"}
+			],
+			"outputs": [{"name": "", "type": "uint256"}]
+		},
+		{
+			"name": "approve",
+			"type": "function",
+			"stateMutability": "nonpayable",
+			"inputs": [
+				{"name": "_spender", "type": "address"},
+				{"name": "_value",   "type": "uint256"}
+			],
+			"outputs": [{"name": "", "type": "bool"}]
+		}
+	]`)
+}