160 lines
4.4 KiB
Python
160 lines
4.4 KiB
Python
import json
|
|
import fnmatch
|
|
from datetime import datetime
|
|
from pathlib import Path
|
|
from typing import Any, Optional, List, Dict
|
|
|
|
from fastmcp import FastMCP
|
|
|
|
|
|
class MemoryServer:
|
|
def __init__(self):
|
|
self.mcp = FastMCP("Memory-Server")
|
|
self.storage_path = Path("./memory_data.json")
|
|
# Register tools
|
|
self.mcp.tool()(self.save)
|
|
self.mcp.tool()(self.get)
|
|
self.mcp.tool()(self.delete)
|
|
self.mcp.tool()(self.list_keys)
|
|
self.mcp.tool()(self.save_with_namespace)
|
|
self.mcp.tool()(self.get_by_namespace)
|
|
|
|
def _load_memory(self) -> Dict[str, Dict]:
|
|
"""Load memory from JSON file."""
|
|
if not self.storage_path.exists():
|
|
return {}
|
|
with self.storage_path.open("r", encoding="utf-8") as f:
|
|
return json.load(f)
|
|
|
|
def _save_memory(self, data: Dict[str, Dict]):
|
|
"""Save memory to JSON file."""
|
|
self.storage_path.parent.mkdir(parents=True, exist_ok=True)
|
|
with self.storage_path.open("w", encoding="utf-8") as f:
|
|
json.dump(data, f, indent=2, ensure_ascii=False)
|
|
|
|
def _validate_key(self, key: str) -> bool:
|
|
"""Simple validation to avoid path traversal etc."""
|
|
if ".." in key or "/" in key or "\\" in key:
|
|
return False
|
|
return True
|
|
|
|
def save(self, key: str, value: Any) -> bool:
|
|
"""
|
|
Save a value under a key.
|
|
|
|
Args:
|
|
key: Unique identifier.
|
|
value: Any JSON-serializable value.
|
|
|
|
Returns:
|
|
True on success, False otherwise.
|
|
"""
|
|
if not self._validate_key(key):
|
|
return False
|
|
data = self._load_memory()
|
|
data[key] = {
|
|
"value": value,
|
|
"timestamp": datetime.utcnow().isoformat()
|
|
}
|
|
self._save_memory(data)
|
|
return True
|
|
|
|
def get(self, key: str) -> Optional[Dict]:
|
|
"""
|
|
Retrieve a value with metadata.
|
|
|
|
Args:
|
|
key: Identifier to look up.
|
|
|
|
Returns:
|
|
Dict with keys 'key', 'value', 'timestamp' or None.
|
|
"""
|
|
if not self._validate_key(key):
|
|
return None
|
|
data = self._load_memory()
|
|
entry = data.get(key)
|
|
if entry is None:
|
|
return None
|
|
return {
|
|
"key": key,
|
|
"value": entry["value"],
|
|
"timestamp": entry["timestamp"]
|
|
}
|
|
|
|
def delete(self, key: str) -> bool:
|
|
"""
|
|
Delete a key from memory.
|
|
|
|
Args:
|
|
key: Identifier to delete.
|
|
|
|
Returns:
|
|
True if the key existed and was removed, False otherwise.
|
|
"""
|
|
if not self._validate_key(key):
|
|
return False
|
|
data = self._load_memory()
|
|
if key in data:
|
|
del data[key]
|
|
self._save_memory(data)
|
|
return True
|
|
return False
|
|
|
|
def list_keys(self, pattern: str = "*") -> List[str]:
|
|
"""
|
|
List all keys matching a wildcard pattern.
|
|
|
|
Args:
|
|
pattern: Wildcard pattern (* and ? supported).
|
|
|
|
Returns:
|
|
List of matching keys.
|
|
"""
|
|
data = self._load_memory()
|
|
return [k for k in data.keys() if fnmatch.fnmatch(k, pattern)]
|
|
|
|
def save_with_namespace(self, key: str, value: Any, namespace: str = "default") -> bool:
|
|
"""
|
|
Save a value with a namespace prefix.
|
|
|
|
Args:
|
|
key: Identifier.
|
|
value: JSON-serializable value.
|
|
namespace: Namespace name.
|
|
|
|
Returns:
|
|
True on success, False otherwise.
|
|
"""
|
|
full_key = f"{namespace}:{key}"
|
|
return self.save(full_key, value)
|
|
|
|
def get_by_namespace(self, namespace: str = "default") -> List[Dict]:
|
|
"""
|
|
Retrieve all entries belonging to a namespace.
|
|
|
|
Args:
|
|
namespace: Namespace to query.
|
|
|
|
Returns:
|
|
List of dictionaries with metadata for each entry.
|
|
"""
|
|
prefix = f"{namespace}:"
|
|
data = self._load_memory()
|
|
result = []
|
|
for k, v in data.items():
|
|
if k.startswith(prefix):
|
|
result.append({
|
|
"key": k,
|
|
"value": v["value"],
|
|
"timestamp": v["timestamp"]
|
|
})
|
|
return result
|
|
|
|
|
|
if __name__ == "__main__":
|
|
server = MemoryServer()
|
|
server.mcp.run(
|
|
transport="stdio",
|
|
show_banner=False,
|
|
log_level="ERROR"
|
|
) |