How to fix ERR DISCARD without MULTI in Redis

MULTI -> Queue commands -> (EXEC or DISCARD)

# Bad: shared connection
redis_conn = get_shared_connection()
redis_conn.multi()
# ... another thread uses redis_conn here ...
redis_conn.discard()  # Error: DISCARD without MULTI

# Good: connection per transaction
with redis.pipeline(transaction=True) as pipe:
    pipe.multi()
    pipe.set('key', 'value')
    pipe.execute()

try:
    redis_conn.multi()
    redis_conn.set('key1', 'value1')
    redis_conn.incr('counter')
    redis_conn.execute()
except Exception as e:
    # DISCARD only if transaction is still active
    try:
        redis_conn.discard()
    except ResponseError:
        # Transaction already aborted, connection is clean
        pass
    raise

# Using redis-py pipeline (manages transaction state)
with redis_client.pipeline(transaction=True) as pipe:
    pipe.set('key1', 'value1')
    pipe.incr('counter')
    results = pipe.execute()

# Using Jedis in Java
try (Jedis jedis = jedisPool.getResource()) {
    Pipeline pipeline = jedis.pipelined();
    pipeline.watch("key");
    pipeline.multi();
    pipeline.set("key", "value");
    List<Object> results = pipeline.exec();  // Handles DISCARD on watch failure
}

import logging
import redis

logger = logging.getLogger(__name__)

class MonitoredRedis:
    def __init__(self, client):
        self.client = client
        self.in_transaction = False
    
    def multi(self):
        logger.debug("Starting transaction")
        self.in_transaction = True
        return self.client.multi()
    
    def discard(self):
        if not self.in_transaction:
            logger.error("DISCARD called without MULTI")
            raise RuntimeError("DISCARD without MULTI")
        self.in_transaction = False
        return self.client.discard()