From 941fff1b9d0f55c98ff2f26eaa57fefdc2e09c8e Mon Sep 17 00:00:00 2001
From: aitbc <aitbc@keisanki.net>
Date: Wed, 22 Apr 2026 13:41:06 +0200
Subject: [PATCH] Fix sync error: use block_data['height'] instead of undefined
 height variable

---
 aitbc/constants.py                           | 30 +++++++++++++
 aitbc/exceptions.py                          | 44 ++++++++++++++++++++
 apps/blockchain-node/src/aitbc_chain/sync.py |  2 +-
 3 files changed, 75 insertions(+), 1 deletion(-)
 create mode 100644 aitbc/constants.py
 create mode 100644 aitbc/exceptions.py

diff --git a/aitbc/constants.py b/aitbc/constants.py
new file mode 100644
index 00000000..3927d5cb
--- /dev/null
+++ b/aitbc/constants.py
@@ -0,0 +1,30 @@
+"""
+AITBC Common Constants
+Centralized constants for AITBC system paths and configuration
+"""
+
+from pathlib import Path
+
+# AITBC System Paths
+DATA_DIR = Path("/var/lib/aitbc")
+CONFIG_DIR = Path("/etc/aitbc")
+LOG_DIR = Path("/var/log/aitbc")
+REPO_DIR = Path("/opt/aitbc")
+
+# Common subdirectories
+KEYSTORE_DIR = DATA_DIR / "keystore"
+BLOCKCHAIN_DATA_DIR = DATA_DIR / "data" / "ait-mainnet"
+MARKETPLACE_DATA_DIR = DATA_DIR / "data" / "marketplace"
+
+# Configuration files
+ENV_FILE = CONFIG_DIR / ".env"
+NODE_ENV_FILE = CONFIG_DIR / "node.env"
+
+# Default ports
+BLOCKCHAIN_RPC_PORT = 8006
+BLOCKCHAIN_P2P_PORT = 7070
+AGENT_COORDINATOR_PORT = 9001
+MARKETPLACE_PORT = 8081
+
+# Package version
+PACKAGE_VERSION = "0.3.0"
diff --git a/aitbc/exceptions.py b/aitbc/exceptions.py
new file mode 100644
index 00000000..4687b4a7
--- /dev/null
+++ b/aitbc/exceptions.py
@@ -0,0 +1,44 @@
+"""
+AITBC Exception Hierarchy
+Base exception classes for AITBC applications
+"""
+
+
+class AITBCError(Exception):
+    """Base exception for all AITBC errors"""
+    pass
+
+
+class ConfigurationError(AITBCError):
+    """Raised when configuration is invalid or missing"""
+    pass
+
+
+class NetworkError(AITBCError):
+    """Raised when network operations fail"""
+    pass
+
+
+class AuthenticationError(AITBCError):
+    """Raised when authentication fails"""
+    pass
+
+
+class EncryptionError(AITBCError):
+    """Raised when encryption or decryption fails"""
+    pass
+
+
+class DatabaseError(AITBCError):
+    """Raised when database operations fail"""
+    pass
+
+
+class ValidationError(AITBCError):
+    """Raised when input validation fails"""
+    pass
+
+
+class BridgeError(AITBCError):
+    """Base exception for bridge errors"""
+    pass
diff --git a/apps/blockchain-node/src/aitbc_chain/sync.py b/apps/blockchain-node/src/aitbc_chain/sync.py
index 83facfce..ae3fbe60 100755
--- a/apps/blockchain-node/src/aitbc_chain/sync.py
+++ b/apps/blockchain-node/src/aitbc_chain/sync.py
@@ -380,7 +380,7 @@ class ChainSync:
             
             if computed_root != expected_root:
                 logger.warning(
-                    f"[SYNC] State root mismatch at height {height}: "
+                    f"[SYNC] State root mismatch at height {block_data['height']}: "
                     f"expected {expected_root.hex()}, computed {computed_root.hex()}"
                 )
                 # For now, log warning but accept block (to be enforced in Phase 1.3)