class Mysql(models.Model):
 Env = (
 (1, 'Dev'),
 (2, 'Qa'),
 (3, 'Prod'),
 )
 create_time = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')
 update_time = models.DateTimeField(auto_now=True, verbose_name='更新时间')

 project_id = models.IntegerField(verbose_name='项目')
 project_tmp = models.CharField(max_length=128, default='')
 environment = models.IntegerField(choices=Env, verbose_name='环境')

 master_host = models.GenericIPAddressField(verbose_name='master主机')
 master_port = models.IntegerField(default=3306, verbose_name='master端口')

 slave_host = models.GenericIPAddressField(null=True, verbose_name='slave主机')
 slave_port = models.IntegerField(null=True, default=3306, verbose_name='slave端口')

 database = models.CharField(max_length=64, verbose_name='数据库')

 read_groups = models.ManyToManyField(Group, related_name='read', verbose_name='读权限')
 write_groups = models.ManyToManyField(Group, related_name='write', verbose_name='写权限')

 description = models.TextField(null=True, verbose_name='备注')

def mysql(request):
 if request.method == 'GET':
 if request.user.is_superuser:
 _lists = Mysql.objects.all().order_by('id')
 else:
 # 获取登录用户的所有组
 _user_groups = request.user.groups.all()

 # 构造一个空的QuerySet然后合并
 _lists = Mysql.objects.none()
 for group in _user_groups:
 _lists = _lists | group.read.all()

 return render(request, 'overmind/mysql.index.html', {'request': request, 'lPage': _lists})

def get_project_database(request, project, environment):
 if request.method == 'GET':
 _jsondata = {}

 if request.user.is_superuser:
 # 返回所有项目和环境匹配的DB
 _lists = Mysql.objects.filter(
 project_id=int(project),
 environment=int(environment)
 )

 _jsondata = {i.id: i.database for i in _lists}
 else:
 # 只返回用户有权限查询的DB
 _user_groups = request.user.groups.all()

 for group in _user_groups:
 # 循环mysql表中有read_groups权限的所有组
 for mysql in group.read.all():
  if mysql.project_id == int(project) and mysql.environment == int(environment):
  _jsondata[mysql.id] = mysql.database

 return JsonResponse(_jsondata)

def check_permission(perm, mysql, user):
 # 如果用户是超级管理员则有权限
 if user.is_superuser:
 return True

 # 取出用户所属的所有组
 _user_groups = user.groups.all()

 # 取出Mysql对应权限的所有组
 if perm == 'read':
 _mysql_groups = mysql.read_groups.all()
 if perm == 'write':
 _mysql_groups = mysql.write_groups.all()

 # 用户组和DB权限组取交集，有则表示有权限，否则没有权限
 group_list = list(set(_user_groups).intersection(set(_mysql_groups)))

 return False if len(group_list) == 0 else True

def query(request):
 if request.method == 'POST':
 postdata = request.body.decode('utf-8')
 _host = get_object_or_404(Mysql, id=int(postdata.get('database')))

 # 检查用户是否有DB的查询权限
 if check_permission('read', _host, request.user) == False:
 return JsonResponse({'state': 0, 'message': '当前用户没有查询此DB的权限'})