手写Redis协议解析器、内存数据库和持久化
创建一个简单的Redis协议解析器、内存数据库和持久化逻辑涉及到许多组件和概念。以下是一个非常基本的实现示例,仅用于教学目的。
import socket
# 简单的内存键值存储
storage = {}
def handle_set(command, client_socket):
key, value = command.split()[1:]
storage[key] = value
client_socket.send("+OK\r\n".encode("utf-8"))
def handle_get(command, client_socket):
key = command.split()[1]
value = storage.get(key)
if value:
client_socket.send(f"+{value}\r\n".encode("utf-8"))
else:
client_socket.send("-ERR no such key\r\n".encode("utf-8"))
def handle_command(client_socket):
request = client_socket.recv(1024).decode("utf-8")
command = request.split()[0]
if command == "SET":
handle_set(request, client_socket)
elif command == "GET":
handle_get(request, client_socket)
else:
client_socket.send("-ERR unknown command\r\n".encode("utf-8"))
def main():
server_socket = socket.socket()
server_socket.bind(('localhost', 6379))
server_socket.listen(5)
while True:
client_socket, _ = server_socket.accept()
handle_command(client_socket)
client_socket.close()
if __name__ == "__main__":
main()
这个简易的Redis服务器实现了SET
和GET
命令,并且支持简单的内存存储。它没有实现持久化逻辑,因此如果服务器重启,所有数据都会丢失。在实际的Redis中,持久化通常通过RDB(快照)或AOF(追加文件)来实现,并且解析器会更复杂,因为它需要处理各种复杂的命令和协议细节。
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