stream.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""Websocket part"""

# Third-party modules
from astropy.time import Time
import time
import os
    
def send_timestamp(socketio):
    while True:
        now = Time.now()
        socketio.emit('timestamp', now.unix)
        time.sleep(1)

def send_status(app, socketio, url, timeout=1):
    name = url # maybe different?
    while True:
        with app.test_client() as client:
            res = client.get(url).get_json()
            socketio.emit(name, res)
            time.sleep(1)

def send_webcam(app, socketio, url):
    name = url # maybe different?
    while True:
        with app.test_client() as client:
            res = client.get(url).get_json()
            img = res["response"].encode("ISO-8859-1")
            socketio.emit(url, bytes(img))
            
        time.sleep(1)
        
def tail_f(socketio, num_lines=30):
    today = Time.now().iso.split()[0]
    filename = f"./data/log/OARPAF.{today}.log"
    
    file_size = os.path.getsize(filename)
    while True:
        current_size = os.path.getsize(filename)
        if current_size < file_size:
            # File has been truncated or deleted, reset file pointer
            file_size = 0
            with open(filename, 'r') as f:
                lines = f.readlines()[-num_lines:]
        elif current_size > file_size:
            # File has been appended
            with open(filename, 'r') as f:
                f.seek(file_size)
                new_lines = f.readlines()
                file_size = current_size
                if new_lines:
                    socketio.emit('new_lines', new_lines)
        else:
            # File remains unchanged
            pass
        
        socketio.sleep(0.2)  # Sleep for 2 seconds before checking again        

def start_broadcast(app, socketio):
    socketio.start_background_task(tail_f, socketio=socketio)
    socketio.start_background_task(send_timestamp, socketio=socketio)
    
    socketio.start_background_task(send_status, app=app, socketio=socketio,
                                   url="/api/dome/status")
    socketio.start_background_task(send_status, app=app, socketio=socketio,
                                   url="/api/telescope/status")
    socketio.start_background_task(send_status, app=app, socketio=socketio,
                                   url="/api/camera/status")
    socketio.start_background_task(send_status, app=app, socketio=socketio,
                                   url="/api/environment/status", timeout=40)
    socketio.start_background_task(send_status, app=app, socketio=socketio,
                                   url="/api/sequencer/run")
    socketio.start_background_task(send_webcam, app=app, socketio=socketio,
                                   url="/api/webcam/snapshot")