Initial commit: smart contract templates for bash, go, python, and typescript

python/process.py

@@ -0,0 +1,140 @@
+"""
+Smart Contract Processing Logic
+
+This file contains the transaction processing logic for your smart contract.
+Modify the `process` function to implement your business logic.
+"""
+
+import json
+from dataclasses import dataclass
+from typing import Any, Optional
+
+
+# =============================================================================
+# SMART CONTRACT IMPLEMENTATION - MODIFY THIS FILE
+# =============================================================================
+
+
+@dataclass
+class TransactionHeader:
+    """Transaction metadata from Dragonchain."""
+
+    tag: str
+    dc_id: str
+    txn_id: str
+    block_id: str
+    txn_type: str
+    timestamp: str
+    invoker: str
+
+    @classmethod
+    def from_dict(cls, data: dict[str, Any]) -> "TransactionHeader":
+        """Parse header from dictionary."""
+        return cls(
+            tag=data.get("tag", ""),
+            dc_id=data.get("dc_id", ""),
+            txn_id=data.get("txn_id", ""),
+            block_id=data.get("block_id", ""),
+            txn_type=data.get("txn_type", ""),
+            timestamp=data.get("timestamp", ""),
+            invoker=data.get("invoker", ""),
+        )
+
+
+@dataclass
+class Transaction:
+    """
+    Parsed transaction from the server.
+
+    Customize this class to match your transaction payload structure.
+    """
+
+    version: str
+    header: TransactionHeader
+    payload: dict[str, Any]
+
+    @classmethod
+    def from_json(cls, json_str: str) -> "Transaction":
+        """Parse a transaction from JSON string."""
+        data = json.loads(json_str)
+        return cls(
+            version=data.get("version", ""),
+            header=TransactionHeader.from_dict(data.get("header", {})),
+            payload=data.get("payload", {}),
+        )
+
+
+@dataclass
+class ProcessResult:
+    """Result from the process function."""
+
+    data: Optional[dict[str, Any]] = None
+    output_to_chain: bool = True
+    error: Optional[str] = None
+
+
+def process(
+    tx_json: str,
+    env_vars: dict[str, str],
+    secrets: dict[str, str],
+) -> ProcessResult:
+    """
+    Process an incoming transaction.
+
+    Implement your smart contract logic here.
+
+    Args:
+        tx_json: Raw transaction JSON string
+        env_vars: Environment variables passed from the server
+        secrets: Secrets passed from the server (e.g., API keys, credentials)
+
+    Returns:
+        ProcessResult containing the result data, whether to output to chain, and any error
+    """
+    try:
+        # Parse the transaction JSON
+        tx = Transaction.from_json(tx_json)
+    except json.JSONDecodeError as e:
+        return ProcessResult(error=f"Failed to parse transaction: {e}")
+
+    # ==========================================================================
+    # TODO: Implement your smart contract logic here
+    # ==========================================================================
+    #
+    # Example: Access transaction data
+    # txn_id = tx.header.txn_id
+    # txn_type = tx.header.txn_type
+    # payload = tx.payload
+    #
+    # Example: Access environment variables
+    # sc_name = env_vars.get("SMART_CONTRACT_NAME")
+    # dc_id = env_vars.get("DRAGONCHAIN_ID")
+    #
+    # Example: Access secrets
+    # api_key = secrets.get("SC_SECRET_MY_API_KEY")
+    #
+    # Example: Process based on payload action
+    # action = tx.payload.get("action")
+    # if action == "create":
+    #     # Handle create operation
+    #     pass
+    # elif action == "update":
+    #     # Handle update operation
+    #     pass
+    # else:
+    #     return ProcessResult(error=f"Unknown action: {action}")
+
+    # Default implementation: echo back the transaction
+    result = {
+        "status": "processed",
+        "transaction_id": tx.header.txn_id,
+        "txn_type": tx.header.txn_type,
+        "payload": tx.payload,
+        "message": "Transaction processed successfully",
+    }
+
+    return ProcessResult(
+        data=result,
+        output_to_chain=True,
+        error=None,
+    )