CrashCourse/NetworkManager.py at master · iangmhill/CrashCourse · GitHub

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import os
import sys
os.chdir('tftpy')
sys.path.insert(0, os.getcwd())
from TftpClient import TftpClient
from TftpShared import TftpException
os.chdir('..')
sys.path.insert(0, os.getcwd())
import urllib
import urllib2
import cPickle as pickle
from datastructures import User


class NetworkManager(object):
    def __init__(self):
        try:
            urllib.urlretrieve("http://students.olin.edu/2017/ihill/ServerAddress.txt", "ServerAddress.txt")
            with open('ServerAddress.txt', 'r') as ip:
                lines  = ip.readlines()
                self.ip = lines[0].rstrip()
                self.port = int(lines[1])
            os.remove('ServerAddress.txt')
            self.client = TftpClient(self.ip,self.port)
            self.started = True
        except:
            self.started = False

    def check_internet(self):
        if self.started == False:
            try:
                urllib.urlretrieve("http://students.olin.edu/2017/ihill/ServerAddress.txt", "ServerAddress.txt")
                with open('ServerAddress.txt', 'r') as ip:
                    lines  = ip.readlines()
                    self.ip = lines[0]
                    self.port = lines[1]
                os.remove('ServerAddress.txt')
                self.client = TftpClient(self.ip,self.port)
                self.started = True
            except:
                self.started = False
                return False
        else:
            try:
                urllib2.urlopen('http://www.google.com',None,timeout=5)
                print("Connected to the Internet")
                return True
            except urllib2.URLError:
                print("Disconnected from the Internet")
                return False

    def create_user(self,username):
        if self.check_internet():
            try:
                self.client.download( username + '.usr', 'temp.usr')
                print("User already exists")
                return -1
            except TftpException:
                print("User does not exist on server \nCreating file")
                os.rename('user.usr',username + '.usr')
                self.client.upload(username + '.usr', username + '.usr')
                os.rename(username + '.usr','user.usr')
                print("Done")


    def update(self,username,password):
        if self.check_internet():
            try:
                self.client.download(username + '.usr','temp.usr')
                print("Downloaded user information")
            except:
                print("User does not exist on server")
                return -1

            if os.path.isfile('temp.usr') and os.path.isfile('user.usr'):
                with open('temp.usr','rb') as temp:
                    online_user = pickle.load(temp)
                with open('user.usr','rb') as local:
                    local_user = pickle.load(local)
            else:
                print("User does not exist on client")
                return -2
            print("Checking if user file is up-to-date")
            if local_user.username != online_user.username or online_user.last_updated > local_user.last_updated:
                """ server version of user is newer than local version """
                os.remove('user.usr')
                os.rename('temp.usr','user.usr')
            elif local_user.username == online_user.username and local_user.last_updated >= online_user.last_updated:
                """ local version of user is newer than server version """
                os.remove('temp.usr')

            with open('user.usr','rb') as userfile:
                    user = pickle.load(userfile)
                    userfile.close()
            if password != user.password:
                print("Incorrect password")
                return -3
            else:
                print("Correct password")
                try:
                    self.client.download('courses.csv', 'courses.csv')
                    print("Downloaded course information")
                    self.client.download('profs.csv','profs.csv')
                    print("Downloaded professor information")
                    self.client.download('stats.sts','stats.sts')
                    print("Downloaded user statistics")
                except:
                    print("Network error when downloading new content")
                    return -4
                else:
                    try:
                        os.rename('user.usr',username + '1.usr')
                        self.client.upload(username+'1.usr', username + '1.usr')
                        os.rename(username + '1.usr','user.usr')
                        print("User content uploaded")
                    except:
                        if os.path.isfile(username + '1.usr'):
                            os.rename(username + '1.usr','user.usr')
                        print("User content upload failed")
                        return -5
                    else:
                        print("Update complete.")
                        return True
        else:
            return 0

if __name__ == '__main__':
    network = NetworkManager()
    network.update('ihill','crashcourse')