Show global header message when bot loses connection with server

discordbot/titanembeds/database/__init__.py

@@ -7,6 +7,7 @@ from sqlalchemy.ext.declarative import declarative_base
 
 import json
 import discord
+import time
 
 Base = declarative_base()
 
@@ -15,6 +16,7 @@ from titanembeds.database.messages import Messages
 from titanembeds.database.guild_members import GuildMembers
 from titanembeds.database.unauthenticated_users import UnauthenticatedUsers
 from titanembeds.database.unauthenticated_bans import UnauthenticatedBans
+from titanembeds.database.keyvalue_properties import KeyValueProperties
 
 class DatabaseInterface(object):
     # Courtesy of https://github.com/SunDwarf/Jokusoramame
@@ -363,3 +365,15 @@ class DatabaseInterface(object):
                 dbuser.revoked = True
                 session.commit()
                 return "Successfully kicked **{}#{}**!".format(dbuser.username, dbuser.discriminator)
+                
+    async def send_webserver_heartbeat(self):
+        async with threadpool():
+            with self.get_session() as session:
+                key = "bot_heartbeat"
+                q = session.query(KeyValueProperties).filter(KeyValueProperties.key == key)
+                if q.count() == 0:
+                    session.add(KeyValueProperties(key=key, value=time.time()))
+                else:
+                    firstobj = q.first()
+                    firstobj.value = time.time()
+                session.commit()

discordbot/titanembeds/database/keyvalue_properties.py

@@ -0,0 +1,17 @@
+from titanembeds.database import db, Base
+import datetime
+
+class KeyValueProperties(Base):
+    __tablename__ = "keyvalue_properties"
+    id = db.Column(db.Integer, primary_key=True)                    # Auto incremented id
+    key = db.Column(db.String(255), nullable=False)                 # Property Key
+    value = db.Column(db.Text())                                    # Property value
+    expiration = db.Column(db.TIMESTAMP)                            # Suggested Expiration for value (None = no expire) in secs
+
+    def __init__(self, key, value, expiration=None):
+        self.key = key
+        self.value = value
+        if expiration:
+            self.expiration = datetime.now() + timedelta(seconds = expiration)
+        else:
+            self.expiration = None