app.py

import streamlit as st
import pandas as pd
import numpy as np
import requests
import time
from datetime import datetime
from timeit import default_timer as timer
from datetime import timedelta

st.set_page_config(
    page_title="Real-Time IoT",
    page_icon="✅",
    layout="wide",
)

st.title("Iot Data")

DATA_URL = 'https://trace.vfsc.vn/iot/xxx'

# def stream():
#     s = requests.Session()
#     with requests.get(DATA_URL, headers=None, stream=True, params={"items":160}) as response:
#         # print(response.status_code)
#         for line in response.iter_lines():
#             if line: print(line)
#             #     print(line.decode('utf-8')['data'])

# stream()


def load_data(n):
    response = requests.get(DATA_URL) if n <= 0 else requests.get(DATA_URL, params = {"items": n})

    plan = response.json()['plan'] 
    data = response.json()['data']

    return data


def is_duplicate(s):
    # st.write(s)
    res = False
    if "duplicates" in st.session_state:
        check_candidate = (s["Id"], s["Time"])
        res = check_candidate in st.session_state["duplicates"]
    st.session_state["duplicates"].add(check_candidate)
    return res

if 'time' not in st.session_state:
    st.session_state['time'] = timer()


df = pd.DataFrame.from_dict(load_data(10))
df.rename({'Lat' : 'lat', 'Lng' : 'lon'}, axis='columns', inplace=True)
st.session_state["duplicates"] = set(zip(df["Id"], df["Time"]))

col1, col2 = st.columns(2)

graph_type = "Bar"
data_col   = "STemp"


with col1:
    data_col = st.selectbox(
        "Choose column to plot",
        [col for col in df.columns if col.lower() in "upt, batv, solv, stemp".split(", ")],
    )

    # st.checkbox("Disable selectbox widget", key="disabled")
    graph_type = st.radio(
        "Choose graph type 👉",
        ('Bar', 'Line'),
    )

with col2:
    placeholder = st.empty()
    while True:
        # new_df = pd.DataFrame.from_dict(load_data(st.session_state["count"]))
        # new_df.rename({'Lat' : 'lat', 'Lng' : 'lon'}, axis='columns', inplace=True)

        curr_time = timer()

        # st.write(timedelta(seconds = curr_time - st.session_state['time']))
        if curr_time - st.session_state['time'] >= 2:
            st.write("Passed")
            new_data = pd.DataFrame.from_dict(load_data(0)).rename({'Lat' : 'lat', 'Lng' : 'lon'}, axis='columns').iloc[-1]
                # print(df.iloc[-1]["Id"], new_data["Id"])
            if is_duplicate(new_data):
                pass
                # st.write("Dup")
            else:
                df.loc[len(df)] = new_data
            st.session_state['time'] = curr_time

        # df = pd.concat([df, pd.DataFrame(new_ele)])

        chart_data = pd.DataFrame(
            df[data_col].tolist(),
            df["moment"].apply(lambda timestr : datetime.strptime(timestr, '%d/%m/%Y %H:%M:%S').time().strftime("%H:%M:%S")).tolist()
        )

        # chart_data.set_index('date')

        with placeholder.container():
            if graph_type == 'Line':
                st.line_chart(chart_data)
            elif graph_type == 'Bar':
                st.bar_chart(chart_data)
            # st.map(df)
            st.write(df)
        # time.sleep(15)
        # st.write(st.session_state)
        # st.session_state["count"] += 1