uptime-monitor/main.py

import cv2
import numpy as np
import urllib.request
from datetime import datetime
import time
recent=[]
history=[]
width=720
height=50
red=(0x00,0x00,0xff)
orange=(0x00,0x66,0xff)
yellow=(0x00,0xcc,0xff)
light_green=(0x33,0xff,0xcc)
green=(0x00,0xcc,0x00)
def update_history():
    average=0
    for i in recent:
        average+=i
    average/=len(recent)
    if len(history)>=144:
        del(history[0])
    history.append(average)
def fill(img,pos,color):
    for i in range(5):
        for j in range(height):
            img[j,i+5*pos,:]=[color[0]%256,color[1]%256,color[2]%256]
def update_graph():
    img=np.ones([height,width,3],dtype=np.uint8)
    for i,delay in enumerate(history):
        if delay>=5000:
            fill(img,i,red)
        elif delay>=3000:
            fill(img,i,orange)
        elif delay>=2000:
            fill(img,i,yellow)
        elif delay>=1000:
            fill(img,i,light_green)
        else:
            fill(img,i,green)
    cv2.imwrite("/tmp/uptime-graph/image.png", img)        


    
def testConnect(url):
    try:
        time1=datetime.now().timestamp()
        code=urllib.request.urlopen(url,timeout=5).getcode()
        time2=datetime.now().timestamp()
        delay=int((time2-time1)*1000)
    except:
        code=404
    if code/100>=4:
        delay=10000
    return (code,delay)

if __name__=="__main__":
    lastminute=-1
    while True:
        if datetime.now().second==0 and datetime.now().minute!=lastminute:
        # if True:
            time.sleep(0.5)
            (code,delay)=testConnect("https://blog.clf3.org")
            print(code,end=" ")
            if code/100<=3:
                print("connected",delay,"ms")
            else:
                print("error")
            if len(recent)<10:
                recent.append(delay)
            else:
                update_history()
                update_graph()
                recent=[]
                recent.append(delay)
            lastminute=datetime.now().minute