add judge_server related api

conf/models.py

@@ -28,3 +28,25 @@ class WebsiteConfig(models.Model):
     class Meta:
         db_table = "website_config"
 
+
+class JudgeServer(models.Model):
+    hostname = models.CharField(max_length=64)
+    ip = models.CharField(max_length=32, blank=True, null=True)
+    judger_version = models.CharField(max_length=24)
+    cpu_core = models.IntegerField()
+    memory_usage = models.FloatField()
+    cpu_usage = models.FloatField()
+    last_heartbeat = models.DateTimeField()
+    create_time = models.DateTimeField(auto_now_add=True)
+    task_number = models.IntegerField(default=0)
+    service_url = models.CharField(max_length=128, blank=True, null=True)
+
+    class Meta:
+        db_table = "judge_server"
+
+
+class JudgeServerToken(models.Model):
+    token = models.CharField(max_length=32)
+
+    class Meta:
+        db_table = "judge_server_token"