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import os
import json
from typing import Optional
try:
import psycopg2
from psycopg2 import pool
except ImportError:
psycopg2 = None
DB_FILE = os.getenv("MEP_SQLITE_PATH", "ledger.db")
DB_URL = os.getenv("MEP_DATABASE_URL")
PG_POOL_MIN = int(os.getenv("MEP_PG_POOL_MIN", "1"))
PG_POOL_MAX = int(os.getenv("MEP_PG_POOL_MAX", "5"))
_pg_pool: Optional["pool.SimpleConnectionPool"] = None
def _is_postgres() -> bool:
return bool(DB_URL)
def _get_pg_pool():
global _pg_pool
if _pg_pool is None:
if psycopg2 is None:
raise RuntimeError("psycopg2 is required for Postgres")
_pg_pool = pool.SimpleConnectionPool(PG_POOL_MIN, PG_POOL_MAX, DB_URL)
return _pg_pool
def _get_conn():
if _is_postgres():
return _get_pg_pool().getconn()
return sqlite3.connect(DB_FILE, check_same_thread=False)
def _release_conn(conn):
if _is_postgres():
_get_pg_pool().putconn(conn)
else:
conn.close()
def _row_to_dict(cursor, row):
if row is None:
return None
columns = [desc[0] for desc in cursor.description]
return dict(zip(columns, row))
def init_db():
conn = _get_conn()
cursor = conn.cursor()
cursor.execute('''
CREATE TABLE IF NOT EXISTS ledger (
node_id TEXT PRIMARY KEY,
pub_pem TEXT NOT NULL,
balance REAL NOT NULL
)
''')
cursor.execute('''
CREATE TABLE IF NOT EXISTS tasks (
task_id TEXT PRIMARY KEY,
consumer_id TEXT NOT NULL,
provider_id TEXT,
payload TEXT NOT NULL,
bounty REAL NOT NULL,
status TEXT NOT NULL,
target_node TEXT,
model_requirement TEXT,
result_payload TEXT,
created_at REAL NOT NULL,
updated_at REAL NOT NULL
)
''')
cursor.execute('''
CREATE TABLE IF NOT EXISTS idempotency (
node_id TEXT NOT NULL,
endpoint TEXT NOT NULL,
idem_key TEXT NOT NULL,
response TEXT NOT NULL,
status_code INTEGER NOT NULL,
created_at REAL NOT NULL,
PRIMARY KEY (node_id, endpoint, idem_key)
)
''')
conn.commit()
_release_conn(conn)
def register_node(node_id: str, pub_pem: str) -> float:
conn = _get_conn()
cursor = conn.cursor()
if _is_postgres():
cursor.execute("SELECT balance FROM ledger WHERE node_id = %s", (node_id,))
else:
cursor.execute("SELECT balance FROM ledger WHERE node_id = ?", (node_id,))
row = cursor.fetchone()
if not row:
if _is_postgres():
cursor.execute(
"INSERT INTO ledger (node_id, pub_pem, balance) VALUES (%s, %s, %s) ON CONFLICT (node_id) DO NOTHING",
(node_id, pub_pem, 10.0)
)
else:
cursor.execute(
"INSERT OR IGNORE INTO ledger (node_id, pub_pem, balance) VALUES (?, ?, ?)",
(node_id, pub_pem, 10.0)
)
conn.commit()
if _is_postgres():
cursor.execute("SELECT balance FROM ledger WHERE node_id = %s", (node_id,))
else:
cursor.execute("SELECT balance FROM ledger WHERE node_id = ?", (node_id,))
row = cursor.fetchone()
_release_conn(conn)
return row[0] if row else 10.0
def get_pub_pem(node_id: str) -> Optional[str]:
conn = _get_conn()
cursor = conn.cursor()
if _is_postgres():
cursor.execute("SELECT pub_pem FROM ledger WHERE node_id = %s", (node_id,))
else:
cursor.execute("SELECT pub_pem FROM ledger WHERE node_id = ?", (node_id,))
row = cursor.fetchone()
_release_conn(conn)
return row[0] if row else None
def get_balance(node_id: str) -> Optional[float]:
conn = _get_conn()
cursor = conn.cursor()
if _is_postgres():
cursor.execute("SELECT balance FROM ledger WHERE node_id = %s", (node_id,))
else:
cursor.execute("SELECT balance FROM ledger WHERE node_id = ?", (node_id,))
row = cursor.fetchone()
_release_conn(conn)
return row[0] if row else None
def set_balance(node_id: str, balance: float):
conn = _get_conn()
cursor = conn.cursor()
if _is_postgres():
cursor.execute("UPDATE ledger SET balance = %s WHERE node_id = %s", (balance, node_id))
else:
cursor.execute("UPDATE ledger SET balance = ? WHERE node_id = ?", (balance, node_id))
conn.commit()
_release_conn(conn)
def add_balance(node_id: str, amount: float):
conn = _get_conn()
cursor = conn.cursor()
if _is_postgres():
cursor.execute("UPDATE ledger SET balance = balance + %s WHERE node_id = %s", (amount, node_id))
else:
cursor.execute("UPDATE ledger SET balance = balance + ? WHERE node_id = ?", (amount, node_id))
conn.commit()
_release_conn(conn)
def deduct_balance(node_id: str, amount: float) -> bool:
conn = _get_conn()
cursor = conn.cursor()
if _is_postgres():
cursor.execute(
"UPDATE ledger SET balance = balance - %s WHERE node_id = %s AND balance >= %s",
(amount, node_id, amount)
)
else:
cursor.execute(
"UPDATE ledger SET balance = balance - ? WHERE node_id = ? AND balance >= ?",
(amount, node_id, amount)
)
updated = cursor.rowcount
conn.commit()
_release_conn(conn)
return updated > 0
def create_task(task_id: str, consumer_id: str, payload: str, bounty: float, status: str, target_node: Optional[str], model_requirement: Optional[str], created_at: float):
conn = _get_conn()
cursor = conn.cursor()
if _is_postgres():
cursor.execute(
"INSERT INTO tasks (task_id, consumer_id, provider_id, payload, bounty, status, target_node, model_requirement, result_payload, created_at, updated_at) VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)",
(task_id, consumer_id, None, payload, bounty, status, target_node, model_requirement, None, created_at, created_at)
)
else:
cursor.execute(
"INSERT INTO tasks (task_id, consumer_id, provider_id, payload, bounty, status, target_node, model_requirement, result_payload, created_at, updated_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
(task_id, consumer_id, None, payload, bounty, status, target_node, model_requirement, None, created_at, created_at)
)
conn.commit()
_release_conn(conn)
def update_task_assignment(task_id: str, provider_id: str, status: str, updated_at: float):
conn = _get_conn()
cursor = conn.cursor()
if _is_postgres():
cursor.execute(
"UPDATE tasks SET provider_id = %s, status = %s, updated_at = %s WHERE task_id = %s",
(provider_id, status, updated_at, task_id)
)
else:
cursor.execute(
"UPDATE tasks SET provider_id = ?, status = ?, updated_at = ? WHERE task_id = ?",
(provider_id, status, updated_at, task_id)
)
conn.commit()
_release_conn(conn)
def update_task_result(task_id: str, provider_id: str, result_payload: str, status: str, updated_at: float):
conn = _get_conn()
cursor = conn.cursor()
if _is_postgres():
cursor.execute(
"UPDATE tasks SET provider_id = %s, result_payload = %s, status = %s, updated_at = %s WHERE task_id = %s",
(provider_id, result_payload, status, updated_at, task_id)
)
else:
cursor.execute(
"UPDATE tasks SET provider_id = ?, result_payload = ?, status = ?, updated_at = ? WHERE task_id = ?",
(provider_id, result_payload, status, updated_at, task_id)
)
conn.commit()
_release_conn(conn)
def get_task(task_id: str) -> Optional[dict]:
conn = _get_conn()
if not _is_postgres():
conn.row_factory = sqlite3.Row
cursor = conn.cursor()
if _is_postgres():
cursor.execute("SELECT * FROM tasks WHERE task_id = %s", (task_id,))
else:
cursor.execute("SELECT * FROM tasks WHERE task_id = ?", (task_id,))
row = cursor.fetchone()
if not row:
_release_conn(conn)
return None
if _is_postgres():
result = _row_to_dict(cursor, row)
_release_conn(conn)
return result
result = dict(row)
_release_conn(conn)
return result
def get_active_tasks() -> list:
conn = _get_conn()
if not _is_postgres():
conn.row_factory = sqlite3.Row
cursor = conn.cursor()
if _is_postgres():
cursor.execute("SELECT * FROM tasks WHERE status IN ('bidding', 'assigned')")
else:
cursor.execute("SELECT * FROM tasks WHERE status IN ('bidding', 'assigned')")
rows = cursor.fetchall()
if _is_postgres():
result = [_row_to_dict(cursor, row) for row in rows]
_release_conn(conn)
return result
result = [dict(row) for row in rows]
_release_conn(conn)
return result
def get_idempotency(node_id: str, endpoint: str, idem_key: str) -> Optional[dict]:
conn = _get_conn()
cursor = conn.cursor()
if _is_postgres():
cursor.execute(
"SELECT response, status_code FROM idempotency WHERE node_id = %s AND endpoint = %s AND idem_key = %s",
(node_id, endpoint, idem_key)
)
else:
cursor.execute(
"SELECT response, status_code FROM idempotency WHERE node_id = ? AND endpoint = ? AND idem_key = ?",
(node_id, endpoint, idem_key)
)
row = cursor.fetchone()
if not row:
_release_conn(conn)
return None
response = json.loads(row[0])
result = {"response": response, "status_code": row[1]}
_release_conn(conn)
return result
def set_idempotency(node_id: str, endpoint: str, idem_key: str, response: dict, status_code: int, created_at: float):
conn = _get_conn()
cursor = conn.cursor()
payload = json.dumps(response)
if _is_postgres():
cursor.execute(
"INSERT INTO idempotency (node_id, endpoint, idem_key, response, status_code, created_at) VALUES (%s, %s, %s, %s, %s, %s) ON CONFLICT (node_id, endpoint, idem_key) DO NOTHING",
(node_id, endpoint, idem_key, payload, status_code, created_at)
)
else:
cursor.execute(
"INSERT OR IGNORE INTO idempotency (node_id, endpoint, idem_key, response, status_code, created_at) VALUES (?, ?, ?, ?, ?, ?)",
(node_id, endpoint, idem_key, payload, status_code, created_at)
)
conn.commit()
_release_conn(conn)
init_db()
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