Update pages to use backend api"

src/lib/api.py

@@ -0,0 +1,50 @@
+from typing import Optional
+
+import pandas as pd
+import requests
+
+
+BASE_URL = "http://localhost:8000"
+
+
+def api(
+    section: str,
+    path: str,
+    path_extra_1: Optional[str] = None,
+    path_extra_2: Optional[
+        str
+    ] = None,  # TODO: this is pretty silly, but it works for now
+    as_json: bool = False,
+    params: Optional[dict] = None,
+):
+    """
+    Fetches data from the backend API. To find the corresponding
+    path, look at the `backend/api/` directory. It should be setup
+    so that the `section` is the name of the file, the `path` is the
+    function inside the file.
+
+    Args:
+        section (str): The section of the API to fetch from.
+        path (str): The path of the API to fetch from.
+        path_extra (Optional[str]): An optional extra path to append to the path.
+        as_json (bool): Whether to return the response as JSON.
+
+    Returns:
+        The response from the API.
+    """
+    if path_extra_1:
+        path = f"{path}/{path_extra_1}"
+    if path_extra_2:
+        path = f"{path}/{path_extra_2}"
+    if params:
+        response = requests.get(f"{BASE_URL}/api/{section}/{path}", params=params)
+    else:
+        response = requests.get(f"{BASE_URL}/api/{section}/{path}")
+
+    if as_json:
+        return response.json()
+
+    try:
+        return pd.DataFrame(response.json())
+    except ValueError:
+        return response.json()

src/lib/page.py

@@ -3,17 +3,22 @@
 """
 
 import asyncio
+from asyncio import AbstractEventLoop
+from datetime import datetime
 import os
 import time
-from asyncio import AbstractEventLoop
 
-import streamlit as st
 from anchorpy import Wallet
 from driftpy.account_subscription_config import AccountSubscriptionConfig
 from driftpy.drift_client import DriftClient
+import humanize
+from lib.api import api
 from solana.rpc.async_api import AsyncClient
+import streamlit as st
+
+from utils import load_newest_files
+from utils import load_vat
 
-from utils import load_newest_files, load_vat
 
 RPC_STATE_KEY = "rpc_url"
 NETWORK_STATE_KEY = "network"
@@ -43,6 +48,15 @@ def sidebar():
         f"Have VAT? {'✅' if st.session_state[VAT_STATE_KEY] is not None else 'Not Loaded'} "
     )
 
+    metadata = api("metadata", "", as_json=True)
+    pickle_file = metadata["pickle_file"]
+    pickle_file = pickle_file.split("/")[-1]
+    timestamp = pickle_file.split("-")[1:]
+    timestamp = datetime.strptime(" ".join(timestamp), "%Y %m %d %H %M %S")
+    time_ago = datetime.now() - timestamp
+    time_ago_str = humanize.precisedelta(time_ago, minimum_unit="minutes")
+    st.sidebar.write(f"Last snapshot taken at: {timestamp} ({time_ago_str} ago)")
+
 
 def needs_rpc_and_vat(page_callable: callable):
     """