git ssb

1
var nest = require('depnest')
2
var BloomFilter = require('jsbloom').filter
3
4
exports.gives = nest({
5
  'unread.sync.isUnread': true,
6
  'unread.sync.markRead': true,
7
})
8
9
//load current state of unread messages.
10
11
exports.create = function (api) {
12
13
  var unread = null
14
  if(localStorage.unread) {
15
    try {
16
      unread = JSON.parse(localStorage.unread)
17
    } catch (err) {}
18
19
    if(!unread) {
20
      unread = {timestamp: Date.now()}
21
    }
22
23
    if(!unread.filter) {
24
      unread.filter = new Filter(10000, 0.001)
25
    }
26
    else {
27
      var filter = new BloomFilter(10000, 0.001)
28
      filter.importData(unread.filter)
29
      unread.filter = filter
30
    }
31
  }
32
33
  function isUnread(msg) {
34
    //ignore messages which do not have timestamps
35
    if(!msg.timestamp) return false
36
    if(msg.timestamp < unread.timestamp) return false
37
    return !unread.filter.checkEntry(msg.key)
38
  }
39
40
  function addRead(msg) {
41
    unread.filter.addEntry(msg.key)
42
  }
43
44
  document.body.onunload = function () {
45
    localStorage.unread = JSON.stringify({
46
      timestamp: unread.timestamp,
47
      filter: unread.filter.exportData()
48
    })
49
  }
50
51
  return nest({
52
    'unread.sync.isUnread': isUnread,
53
    'unread.sync.markRead': markRead
54
  })
55
}
56