Add mempool periodic update and get_info endpoint

Incorporated a new periodic mempool update function within `main.py` to emit mempool size changes. Created new `get_info.py` endpoint for retrieving global Kaspa BlockDAG information, and `mempool.py` for handling mempool size updates.

endpoints/get_info.py

@@ -0,0 +1,11 @@
+# encoding: utf-8
+
+from server import kaspad_client
+
+
+async def get_info():
+    """
+    Get some global Kaspa BlockDAG information
+    """
+    resp = await kaspad_client.request("getInfoRequest")
+    return resp["getInfoResponse"]

main.py

@@ -12,10 +12,11 @@
 from sockets.blockdag import periodical_blockdag
 from sockets.bluescore import periodical_blue_score
 from sockets.coinsupply import periodic_coin_supply
+from sockets.mempool import periodical_mempool
 
 print(
     f"Loaded: {sockets.join_room}"
-    f"{periodic_coin_supply} {periodical_blockdag} {periodical_blue_score}")
+    f"{periodic_coin_supply} {periodical_blockdag} {periodical_blue_score} {periodical_mempool}")
 
 BLOCKS_TASK = None  # type: Task
 

sockets/mempool.py

@@ -0,0 +1,23 @@
+# encoding: utf-8
+
+from fastapi_utils.tasks import repeat_every
+
+from endpoints.get_info import get_info
+from server import sio, app
+
+mempool = 0
+
+
+@app.on_event("startup")
+@repeat_every(seconds=1)
+async def periodical_mempool():
+    await emit_mempool()
+
+
+async def emit_mempool():
+    global mempool
+    resp = await get_info()
+
+    if resp["mempoolSize"] != mempool:
+        mempool = resp["mempoolSize"]
+        await sio.emit("mempool", mempool, room="mempool")