SpaceFace.py

import coding
import scratchattach as scratch3
import threading
import time
import random
import os
global conn
global projectid
global endpoint
global users

projectid = os.getenv("ProjectID")
users = {}
session = scratch3.login(os.getenv("Username"), os.getenv("Password"))
class User:
    def __init__(self, name, id):
        self.last_request = time.time()
        self.name = name
        self.id = id
class UserStartup:
    def __init__(self):
        self.last_request = time.time()
class Responder:
    def __init__(self, projectid, channel, can_respond, can_stream, value, user):
        user.last_request = time.time()
        self.user = user
        self.projectid = projectid
        self.can_respond = can_respond
        self.can_stream = can_stream
        self.channel = channel
        self.cooldown = time.time()
        self.wrote = False
        self.last_value = value
    def poll(self):
        value = scratch3.get_var(self.projectid, "channel "+str(self.channel))
        if value != self.last_value and value != None:
            self.user.last_request = time.time()
            self.last_value = value
            binary = coding.decimal_to_binary(int(value))
            if binary[1:3]=="01":
                value = str(coding.binary_to_decimal(binary[3:]))
            if binary[1:3]=="10":
                value = str("true" if binary[3:] == 1 else "false")
            if binary[1:3]=="11":
                value = coding.convert_to_text(binary[3:])
            
            return value
    def close(self):
        if self.can_stream or not self.can_respond:
            conn.set_var("channel "+str(self.channel), "0")
        else:
            while str(scratch3.get_var(self.projectid, "channel "+str(self.channel))) !="0":
                pass
    def respond(self, response):
        global conn
        if self.wrote and not self.can_stream:
            raise Exception("Can't stream to this as a response")
        if not (self.can_respond or self.can_stream):
            raise Exception("Can't respond to this")
        while time.time() - self.cooldown < 0.5:
            time.sleep(0.5 - (time.time() - self.cooldown))
        if self.can_respond or self.can_stream:
            payload = "1"
            if type(response) is int:
                payload+="01"+coding.decimal_to_binary(response)
            elif type(response) is bool:
                payload+="10"+"1" if response else "0"
            elif type(response) is str:
                payload+="11"+coding.convert_to_binary(response)
            self.last_value = str(coding.binary_to_decimal(payload))
            conn.set_var("channel "+str(self.channel), str(coding.binary_to_decimal(payload)))
            t= time.time()
            times=0.2
            while scratch3.get_var(self.projectid, "channel "+str(self.channel)) !=str(coding.binary_to_decimal(payload)):
                if time.time()-t>=times:
                    print("Message not sent, retrying")
                    times+=0.1
                    conn.set_var("channel "+str(self.channel), str(coding.binary_to_decimal(payload)))
                    t=time.time()
        self.wrote = True
class ConnectionEndpoint:
    def receivedMessage(self, message, user, responder):
        global users
        r=random.randrange(1, 2047)
        while r in users:
            r=random.randrange(1, 2047)
        users[r] = User(message, r)
        responder.respond(r)
        responder.close()
class HeartbeatEndpoint:
    def receivedMessage(self, message, user, responder):
        responder.close()

def thread(n):
    global users
    global conn
    global projectid
    global endpoint
    heartbeater = HeartbeatEndpoint()
    conn.set_var("channel "+str(n), "0")
    while True:
        
        value = scratch3.get_var(projectid, "channel "+str(n))
        if str(value) != "0" and value != None:
            binary = coding.decimal_to_binary(int(value))
            reqendpoint = coding.binary_to_decimal(binary[1:6])
            header = coding.binary_to_decimal(binary[6:17])
            staticpayload = binary[17] == '1'
            streamingpayload = binary[18] == '1'
            acceptstaticpayload = binary[19] == '1'
            acceptstreamingpayload = binary[20] == '1'
            payload = None
            if staticpayload and not streamingpayload:
                payloadformat = binary[21:23]
                if payloadformat == "01":
                    payload = str(coding.binary_to_decimal(binary[23:]))
                if payloadformat == "10":
                    payload = "true" if binary[23:]=='1' else "false"
                if payloadformat == "11":
                    payload = coding.convert_to_text(binary[23:])
            if header in users:
                user = users[header]
            else:
                user = UserStartup()
            respond = Responder(projectid, n, acceptstaticpayload, acceptstreamingpayload, value, user)
            if reqendpoint == 31:
                heartbeater.receivedMessage(payload, user, respond)
            else:
                endpoint[reqendpoint].receivedMessage(payload, user, respond)

def monitor_users():
    global users
    while True:
        time.sleep(1)
        for k, v in users:
            if time.time() - v.last_request >= 300:
                del users[k]
def start_server(endpoints):
    global projectid
    global conn
    global endpoint
    endpoints.insert(0, ConnectionEndpoint())
    endpoint = endpoints
    conn = session.connect_cloud(projectid)
    threads = [threading.Thread(target=thread, args=(i+1,)) for i in range(10)]
    for t in threads:
        t.start()
    monitorusers = threading.Thread(target=monitor_users)
    monitorusers.start()