File size: 1,548 Bytes
796ceef dbf2f6d |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 |
from langgraph.checkpoint.sqlite import SqliteSaver
class extended_sqliteSaver(SqliteSaver):
def __init__(self, conn_string):
super().__init__(conn_string)
self.create_table("chat_history", {"thread_id": "TEXT", "message": "TEXT", "response": "TEXT"})
@classmethod
def from_conn_string(cls, conn_string: str) -> "SqliteSaver":
import sqlite3
return SqliteSaver(conn=sqlite3.connect(conn_string, check_same_thread=False))
class Memory:
def __init__(self, payload):
self.checkpoints = extended_sqliteSaver.from_conn_string("_chat_history.sqlite")
if(payload.get("thread_id")):
self.thread_id = payload.get("thread_id")
self.isNew = 0
else:
self.thread_id = "1"
self.isNew = 1
try:
cursor = self.checkpoints.conn.cursor()
## IF THERE ARE MORE THAN N THREADS, DELETE THE OLDEST ONES TO MAKE N THREADS
n=20
cursor.execute(f"DELETE FROM checkpoints WHERE thread_id NOT IN (SELECT thread_id FROM checkpoints ORDER BY thread_id DESC LIMIT {n})")
## GET THE HIGHEST THREAD VALUE AND ADD ONE TO CREATE THE NEW THREAD_ID
self.thread_id=cursor.execute("SELECT thread_id FROM checkpoints ORDER BY thread_id DESC LIMIT 1").fetchone()[0] or 0
self.thread_id=int(self.thread_id)+1
except:
self.thread_id=1
print("New thread created with id #", self.thread_id)
|