import json, hashlib, time
# https://docs.python.org/3/library/json.html
# https://docs.python.org/3/library/hashlib.html

def compute_hash(content):
    return hashlib.sha256(content.encode()).hexdigest()

def get_timestamp():
    return time.time()

async def send_json(writer, data):
    message = f"{json.dumps(data)}\n"
    writer.write(message.encode())
    await writer.drain()

async def receive_json(reader):
    data = await reader.readline()
    if not data:
        return None
    return json.loads(data.decode())