### 介绍
终端使用的是asyncio，单线程支持并发操作。
聊天终端,暂时仅提供登陆/注销/发送在线消息/发送离线消息/帮助功能(未完待续)
登陆命令：auth userid password (userid为用户账号,用户数据存储在mysql中)
注销命令：logout
发送消息：msg userid message (支持在线和离线消息，离线消息,当对方不在线时，存储到 redis中,等用户上线之后再推送给该用户)
帮助命令：help/?
### 环境
系统:`CentOS7`
编程语言:`Python`
语言解释器:`Cpython-3.7.2`
数据库:`mysql-5.7` `redis-5.0.3`
缓存:`redis-5.0.3`
### 表结构
#### user表
```sql
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(255) NOT NULL,
`password` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=91 DEFAULT CHARSET=utf8;
```
### 服务器端代码
chat_server.py
```py
#coding:utf-8
######################
# 作者: SheYinsong #
# 时间: 2019-03-30 #
######################
import asyncio
import aiomysql
import aioredis
import sys
import struct
import ssl
import time
import logging
SERVER_ADDRESS = ('0.0.0.0',10000)
logging.basicConfig(
level=logging.DEBUG,
format='%(name)s: %(message)s',
stream=sys.stderr,
)
log=logging.getLogger('main')
#LOOP
loop=asyncio.get_event_loop()
#TLS配置
CERTFILE='ssl/server.crt'
KEYFILE='ssl/server.key'
#在线用户userid到读写Stream映射
auth_userid_map_wstream={}
auth_wstream_map_userid={}
#mysql 配置
db_config={
'host':'localhost',
'port':3306,
'user':'root',
'password':'xxxxxxxx',
'db':'chat',
'charset':'utf8'
}
#SQL 模板
QUERY_AUTH_SQL='select password from user where id=%s'
QUERY_USERID_IS_EXISTS_SQL='select id from user where id=%s'
QUERY_USERNAME_OF_USERID_SQL='select username from user where id=%s'
#redis配置
#redis_host='localhost'
#redis_port=6379
redis_unix_socket='/var/run/redis/redis.sock'
#redis KEY模板
KV_EXISTS_USERID=u'kv_exists_userid:userid:%s'
KV_USERID_GET_USERNAME=u'kv_userid_get_username:userid:%s'
LIST_USERMESSAGES_OF_USERID=u'list_usermessages_of_userid:userid:%s'
#支持的命令列表
cmd_list=['auth','msg','logout']
#命令帮助
cmd_help="""
===============================================
| |
| 命令使用说明: |
| |
===============================================
|命令 参数 参数 (说明) |
===============================================
|auth UID PASSWORD (登录系统) |
|msg UID MESSAGE (给用户发送消息) |
===============================================
|命令 (说明) |
===============================================
|logout (退出) |
===============================================
"""
async def get_custom_time_string(t_format="%Y-%m-%d %X"):
"""获取指定格式的时间字符串
默认格式为"%Y-%m-%d %X"
"""
return time.strftime(t_format)
async def get_db_pool():
"""获取mysql连接池"""
pool = await aiomysql.create_pool(**db_config)
return pool
async def get_redis_pool():
"""获取redis连接池"""
pool = await aioredis.create_pool(
redis_unix_socket,
minsize=5, maxsize=10)
return pool
async def db_query(sql):
"""mysql执行查询操作"""
pool = await get_db_pool()
results=()
async with pool.acquire() as conn:
async with conn.cursor() as cur:
log.debug(f'查询数据库,SQL->[ {sql} ]')
await cur.execute(sql)
results = await cur.fetchall()
pool.close()
await pool.wait_closed()
return results
async def redis_query(cmd,*args):
"""redis执行查询操作"""
pool=await get_redis_pool()
with await pool as conn:
results =await conn.execute(cmd,*args)
pool.close()
await pool.wait_closed()
return results
async def redis_dml(cmd,*args):
"""redis执行增删改操作"""
pool=await get_redis_pool()
with await pool as conn:
await conn.execute(cmd,*args)
pool.close()
await pool.wait_closed()
async def get_username_of_userid(userid):
"""获取userid对应的用户名"""
if await redis_query('exists',KV_USERID_GET_USERNAME % userid):
username=await redis_query('get',KV_USERID_GET_USERNAME % userid)
return username.decode('utf-8')
else:
res=await db_query(QUERY_USERNAME_OF_USERID_SQL % userid)
if res:
username=res[0][0]
await redis_dml('set',KV_USERID_GET_USERNAME % userid,username)
return username
return ''
async def get_userid_of_wstream(wstream):
"""通过writestream获取userid"""
try:
userid=auth_wstream_map_userid[wstream]
return userid
except KeyError:
return -1
async def get_wstream_of_userid(userid):
"""通过userid获取writestream"""
try:
write_stream=auth_userid_map_wstream[userid]
return write_stream
except KeyError:
return ''
async def write_data(writer,data):
"""发送数据"""
b_data=bytes(data,encoding='utf-8')
b_datasize=struct.pack('H',len(b_data))
try:
writer.write(b_datasize+b_data)
await writer.drain()
return True
except:
await clean_wstream(writer)
return False
async def read_data(reader):
"""读取数据"""
try:
length=struct.unpack('H',await reader.read(2))[0]
b_data=await reader.read(int(length))
return b_data.decode('utf-8')
except Exception as e:
log.debug(f'读取客户端数据异常:[{e}]')
return ''
async def clean_wstream(writer):
"""清理客户端登陆信息和关闭stream"""
userid=await get_userid_of_wstream(writer)
if userid != -1:
try:
del auth_userid_map_wstream[userid]
except:
pass
try:
del auth_wstream_map_userid[writer]
except:
pass
writer.close()
async def user_auth(*args):
"""用户认证"""
userid=int(args[0])
pwd=args[1]
sql=QUERY_AUTH_SQL % (userid)
res=await db_query(sql)
if res:
if res[0][0] == pwd:
return True
return False
async def userid_is_exists(userid):
""""判断userid是否存在"""
if await redis_query('exists',KV_EXISTS_USERID % userid):
return True
else:
res=await db_query(QUERY_USERID_IS_EXISTS_SQL % userid)
if res:
await redis_dml('set',KV_EXISTS_USERID % userid,'')
return True
return False
async def userid_is_online(userid):
"""判断用户是否在线"""
try:
writer=auth_userid_map_wstream[userid]
return True
except KeyError:
return False
async def offline_userid(operator_type,*args):
"""下线用户"""
userid=int(args[0])
try:
writer=auth_userid_map_wstream[userid]
if operator_type == 0:
msg='有用户登录您的账号,您已被挤下线！'
elif operator_type == 1:
msg='您已退出登录！'
else:
msg='您已退出系统！'
await write_data(writer,msg)
except Exception as e:
log.debug(e)
finally:
try:
del auth_userid_map_wstream[userid]
except:
log.debug('auth_userid_map_wstream 删除失败')
try:
del auth_wstream_map_userid[writer]
except:
log.debug('auth_wstream_map_userid 删除失败')
async def send_user_msg(writer,*args):
"""发送用户消息"""
to_userid=int(args[0])
from_userid=auth_wstream_map_userid[writer]
content=' '.join(args[1:])
if not await userid_is_exists(to_userid):
msg='系统不存在该userid!'
await write_data(writer,msg)
return
from_username=await get_username_of_userid(from_userid)
to_username=await get_username_of_userid(to_userid)
custom_time=await get_custom_time_string()
send_content=f'{custom_time}\n[ {from_username}|UID:{from_userid} ]:{content}'
if to_userid == from_userid:
send_content=f'{custom_time}\n[ {from_username}|UID:{from_userid} ]:{content}'
await write_data(writer,send_content)
return
if await userid_is_online(to_userid):
to_writer=auth_userid_map_wstream[to_userid]
if await write_data(to_writer,send_content):
await write_data(writer,send_content)
return
#用户不在线，发送离线消息
print("用户不在线，发送离线消息")
await redis_dml('rpush',LIST_USERMESSAGES_OF_USERID % to_userid,send_content)
await write_data(writer,f'[离线消息]\n{send_content}')
async def user_is_auth(writer):
"""判断用户是否认证"""
if writer in auth_wstream_map_userid.keys():
return True
return False
async def get_offline_msg_of_userid(userid):
"获取userid对应的离线消息"
return await redis_query('lrange',LIST_USERMESSAGES_OF_USERID % userid,0,-1)
async def push_offline_msg(writer,*args):
"""推送离线消息"""
userid=int(args[0])
user_offline_messages_list=await get_offline_msg_of_userid(userid)
for user_offline_message in user_offline_messages_list:
await write_data(writer,user_offline_message.decode('utf-8'))
await redis_query('del',LIST_USERMESSAGES_OF_USERID % userid)
async def update_auth(writer,*args):
"""更新auth_userid_map_wstream和auth_wstream_map_userid"""
userid=int(args[0])
auth_userid_map_wstream[userid]=writer
auth_wstream_map_userid[writer]=userid
async def check_args_validity(writer,cmd,*args):
if cmd == 'auth':
if len(args) != 2:
msg='提示:认证格式: [ auth userid pwd ]'
await write_data(writer,msg)
return False
try:
userid=int(args[0])
except:
msg='userid为整数!'
await write_data(writer,msg)
return False
elif cmd == 'msg':
if len(args) < 2:
msg='提示:消息格式: [ msg userid content ]'
await write_data(writer,msg)
return False
try:
to_userid=int(args[0])
except:
msg='userid为整数!'
await write_data(writer,msg)
return False
return True
async def handler_client(reader,writer):
"""处理客户端连接"""
address=writer.get_extra_info('peername')
log=logging.getLogger('echo_{}_{}'.format(*address))
log.debug('收到新连接')
args_ok=True
cmd_ok=True
while True:
if not await user_is_auth(writer) and cmd_ok and args_ok:
msg=u'请登陆！'
await write_data(writer,msg)
data=await read_data(reader)
if not data:
break
cmd=data.split(' ')[0]
args=data.split(' ')[1:]
if cmd == '?' or cmd == 'help':
await write_data(writer,f'{cmd_help}')
cmd_ok=False
continue
elif cmd not in cmd_list:
await write_data(writer,'输入的命令不支持,请使用 help 或 ? 查看帮助!')
cmd_ok=False
continue
cmd_ok=True
if not await user_is_auth(writer):
if cmd != 'auth':
continue
if not await check_args_validity(writer,cmd,*args):
args_ok=False
continue
args_ok=True
if await user_auth(*args):
await offline_userid(0,*args)
await update_auth(writer,*args)
msg='认证成功!'
await write_data(writer,msg)
await push_offline_msg(writer,*args)
else:
msg='认证失败!'
await write_data(writer,msg)
else:
if not await check_args_validity(writer,cmd,*args):
args_ok=False
continue
args_ok=True
if cmd == 'msg':
await send_user_msg(writer,*args)
elif cmd == 'logout':
userid=await get_userid_of_wstream(writer)
await offline_userid(1,userid)
elif cmd == 'auth':
await write_data(writer,'您已登录！')
context=ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
context.load_cert_chain(certfile=CERTFILE,keyfile=KEYFILE)
factory=asyncio.start_server(handler_client,*SERVER_ADDRESS,ssl=context)
server=loop.run_until_complete(factory)
log.debug('starting up on {} port {}'.format(*SERVER_ADDRESS))
try:
loop.run_forever()
except KeyboardInterrupt:
pass
finally:
log.debug('关闭服务器.')
server.close()
loop.run_until_complete(server.wait_closed())
log.debug('关闭事件循环LOOP.')
loop.close()
```
### 客户端
chat_client.py
```py
#coding:utf-8
######################
# 作者: SheYinsong #
# 时间: 2019-03-30 #
######################
import asyncio
from aioconsole import ainput
import concurrent.futures
import sys
import ssl
import time
import struct
import logging
#日志配置
logging.basicConfig(
level=logging.DEBUG,
format='%(name)s: %(message)s',
stream=sys.stderr,
)
log = logging.getLogger('main')
#TLS配置
CERTFILE='ssl/server.crt'
#chat服务器配置
SERVER_ADDRESS = ('chat.unotes.co',10000) #证书使用的chat.unotes.co域名,根据实际证书域名填写
loop = asyncio.get_event_loop()
async def write_data(writer,data):
"""发送数据"""
b_data=bytes(data,encoding='utf-8')
b_datasize=struct.pack('H',len(b_data))
try:
writer.write(b_datasize+b_data)
await writer.drain()
return True
except:
return False
async def read_data(reader):
"""读取数据"""
try:
length=struct.unpack('H',await reader.read(2))[0]
b_data=await reader.read(int(length))
return b_data.decode('utf-8')
except Exception as e:
log.debug(f'读取客户端数据异常:[{e}]')
return ''
async def read(reader,once=False):
"""循环读取数据"""
while True:
data=await read_data(reader)
if data:
if once:
print(f'{data}\n',end='')
break
print(f'\x08\x08\x08{data}\n>>>',end='')
async def chat_client(address):
"""聊天客户端"""
log = logging.getLogger('chat_client')
log.debug('connecting to {} port {}'.format(*address))
context=ssl.create_default_context(ssl.Purpose.SERVER_AUTH)
context.load_verify_locations(CERTFILE)
reader, writer = await asyncio.open_connection(*address,ssl=context)
await read(reader,True)
read_task=asyncio.create_task(read(reader))
while True:
data=await ainput('>>>')
if not data:
data='?'
await write_data(writer,data)
try:
loop.run_until_complete(
chat_client(SERVER_ADDRESS)
)
except:
pass
finally:
log.debug('closing event loop')
loop.close()
```
### 运行服务器
```bash
$ python chat_server_asyncio_tls.py
```
```
asyncio: Using selector: EpollSelector
main: starting up on 0.0.0.0 port 10000
```
### 运行客户端1
#### 用户张三
```bash
python chat_client_asyncio_tls.py
```
```
请登陆！
>>>auth 10001 123456
认证成功!
>>>msg 10002 你好，我是张三
[离线消息]
2019-03-29 17:00:24
[ 张三|UID:10001 ]:你好，我是张三
>>>
```
### 运行客户端2
#### 用户李四
```bash
python chat_client_asyncio_tls.py
```
```
请登陆！
>>>auth 10002 123456
认证成功!
2019-03-29 17:00:24
[ 张三|UID:10001 ]:你好，我是张三
>>>msg 10001 你好，张三，我收到您的消息
2019-03-29 17:02:52
[ 李四|UID:10002 ]:你好，张三，我收到您的消息
>>>
```
#### 查看客户端1
### 用户张三
```bash
$ python chat_client_asyncio_tls.py
```
```
请登陆！
>>>auth 10001 123456
认证成功!
>>>msg 10002 你好，我是张三
[离线消息]
2019-03-29 17:00:24
[ 张三|UID:10001 ]:你好，我是张三
2019-03-29 17:02:52
[ 李四|UID:10002 ]:你好，张三，我收到您的消息
```
©著作权归作者所有：来自ynotes.cn笔记作者兜兜的原创作品，如需转载，请注明出处:https://ynotes.cn/blog/article_detail/170
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