└── pysync.py


/pysync.py:
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  1 | #simple Sync System
  2 | 
  3 | #current features
  4 | #have a record of when you last synced with each contact.
  5 | #When connecting with a contact, get them up to date with items since.
  6 | 
  7 | #future features
  8 | #each data item has a record of who you *first* recieved it from, and when.#not implemented
  9 | #check with contact before sending data item by sending hash (if item is large)
 10 | 
 11 | items_by_recv_date = []
 12 | #item_from = {}
 13 | items = {}
 14 | contacts = {}
 15 | 
 16 | groups = {}
 17 | topics = {}
 18 | 
 19 | ownid = 123
 20 | import time, random
 21 | 
 22 | contacts[ownid] = {'last_sync':0}
 23 | 
 24 | #Dummy function that should use a backend like RS or XMPP
 25 | def send_item(contact, item):
 26 | 	print contact
 27 | 	print item
 28 | 	print "not sending" + str(item) + " to " + str(contact)
 29 | 
 30 | #get contact up to date with own data
 31 | def sync_to_contact(cId):
 32 | 	contact = contacts[cId]
 33 | 	ls = contact['last_sync']
 34 | 	#now =int(time.time())
 35 | 	for i in items_by_recv_date[ls:]:
 36 | 		can_send = True
 37 | 		if 'group' in item and cId not in groups[item['group']]:
 38 | 			can_send = False
 39 | 		if cId not in topics[item['topic']]:
 40 | 			can_send = False
 41 | 		
 42 | 		if can_send:
 43 | 			send_item(cId, i)
 44 | 	#should confirm contact has got data, then:
 45 | 	contact['last_sync'] = len(items_by_recv_date)
 46 | 
 47 | #update all contacts
 48 | def sync_to_contacts():
 49 | 	for c in contacts:
 50 | 		sync_to_contact(c)
 51 | 
 52 | #create new data
 53 | def publish_item(item):
 54 | 	#now =time.time()
 55 | 	#items_by_recv_date[now]=item
 56 | 	#items[item.hash] = item
 57 | 	item['hash'] = hash(str(item))
 58 | 	on_recv_item(ownid, item)
 59 | 	
 60 | #ask contact to update you
 61 | def request_sync(cId):
 62 | 	item = {'type':'hello'}
 63 | 	send_item(cId, item)
 64 | 
 65 | #triggered on program load
 66 | def onload():
 67 | 	for c in contacts:
 68 | 		request_sync(c)
 69 | 	sync_to_contacts()
 70 | 		
 71 | 		
 72 | #triggered by data arriving from function send_item over network
 73 | def on_recv_item(cId, item):
 74 | 	now =time.time()
 75 | 	contact = contacts[cId]
 76 | 	if item['hash'] not in items:
 77 | 		itemtype = item['type']
 78 | 		if itemtype=='hello' and cId != ownid:
 79 | 			on_request_sync(contact)
 80 | 			return
 81 | 		
 82 | 		#store item
 83 | 		items_by_recv_date.append(item)
 84 | 		#items_from[now]=cId
 85 | 		items[item['hash']] = item
 86 | 		
 87 | 		if itemtype=='message':
 88 | 			update_display(item)
 89 | 		
 90 | 		#for changing status relating to topic/group
 91 | 		#could run through history, and remove old status
 92 | 		if itemtype=='leaveGroup':
 93 | 			del groups[item['groupid']][cId]
 94 | 		if itemtype=='joinGroup':
 95 | 			print "---"
 96 | 			print groups[item['groupid']]
 97 | 			groups[item['groupid']][cId]=contact
 98 | 		if itemtype=='leaveTopic':
 99 | 			del topics[item['topicId']][cId]
100 | 		if itemtype=='joinTopic':
101 | 			tId = item['topicId']
102 | 			print "---"
103 | 			print topics
104 | 			print tId
105 | 			if tId not in topics:
106 | 				topics[tId] = {}
107 | 			topics[tId][cId]=contact
108 | 
109 | #this should update a GUI
110 | def update_display(item):
111 | 	print "GOT ITEM"
112 | 	print item
113 | 
114 | #normally triggerd by a contact coming online
115 | def on_request_sync(c):
116 | 	if c in contacts:
117 | 		sync_to_contact[c]
118 | 
119 | 
120 | 
121 | #high level actions
122 | def submit_post(text, topic, group=None, parent=None):
123 | 	item={'type':'message', 'text':text,topic:topic, group:group, parent:parent}
124 | 	publish_item(item)
125 | 	
126 | 
127 | def submit_vote(text, topic, group=None, parent=None):
128 | 	item={'type':'vote', 'vote':vote,topic:topic, group:group, parent:parent}
129 | 	publish_item(item)
130 | 
131 | def join_group(group):
132 | 	item={'type':'joinGroup', 'groupid':group}
133 | 	publish_item(item)
134 | 	
135 | def leave_group(group):
136 | 	item={'type':'leaveGroup', 'groupid':group}
137 | 	publish_item(item)
138 | 
139 | def join_topic(topic):
140 | 	item={'type':'joinTopic', 'topicId':topic}
141 | 	print item
142 | 	publish_item(item)
143 | 	
144 | def leave_topic(topic):
145 | 	item={'type':'leaveTopic', 'topicId':topic}
146 | 	publish_item(item)
147 | 	
148 | 
149 | def main():
150 | 	onload()
151 | 
152 | main()
153 | 
154 | ttopic = 1
155 | join_topic(ttopic)
156 | 
157 | submit_post("HI", ttopic)


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