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Matt McKegg / patchwork



Tree: 3bcc24c2e8ba5c7392ad4c3b90dbb422167299c6

Files: 3bcc24c2e8ba5c7392ad4c3b90dbb422167299c6 / sbot / subscriptions.js

1712 bytesRaw
1var FlumeReduce = require('flumeview-reduce')
2var normalizeChannel = require('ssb-ref').normalizeChannel
3var FlatMap = require('pull-flatmap')
4var pull = require('pull-stream')
5
6module.exports = function (ssb, config) {
7 var index = ssb._flumeUse('patchwork-subscriptions', FlumeReduce(3, reduce, map))
8 return {
9 stream: function (opts) {
10 var channel = normalizeChannel(opts.channel)
11 return pull(
12 index.stream({live: opts.live}),
13 FlatMap(items => {
14 var result = []
15
16 if (items) {
17 Object.keys(items).forEach(key => {
18 var parts = getParts(key)
19 if (parts && (!channel || parts[1] === channel)) {
20 result.push({from: parts[0], to: parts[1], value: items[key][1], ts: items[key][0]})
21 }
22 })
23 }
24
25 return result
26 })
27 )
28 },
29 get: index.get
30 }
31}
32
33function reduce (result, item) {
34 if (!result) result = {}
35 if (item) {
36 for (var key in item) {
37 if (!result[key] || result[key][0] < item[key][0]) {
38 result[key] = item[key]
39 }
40 }
41 }
42 return result
43}
44
45function getParts (value) {
46 var splitIndex = value.indexOf(':')
47 if (splitIndex > 50) { // HACK: yup
48 return [value.slice(0, splitIndex), value.slice(splitIndex + 1)]
49 }
50}
51
52function map (msg) {
53 if (msg.value.content && msg.value.content.type === 'channel') {
54 if (typeof msg.value.content.subscribed === 'boolean') {
55 var channel = normalizeChannel(msg.value.content.channel)
56 if (channel) {
57 var key = `${msg.value.author}:${channel}`
58 return {
59 [key]: [msg.timestamp, msg.value.content.subscribed]
60 }
61 }
62 }
63 }
64}
65

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