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reduce flumeview-level && return live state of subs, needs refactor

Kieran committed on 5/25/2018, 1:28:26 AM
Parent: 9881ae44565d5783671b359a9bf7c0a0dbdabd49

Files changed

difficult/ex2/index.jsadded
difficult/ex2/index.test.jsadded
package.jsonchanged
difficult/ex2/index.jsView
@@ -1,0 +1,110 @@
1 …+const flumeView = require('flumeview-level')
2 …+const pull = require('pull-stream')
3 …+const defer = require('pull-defer')
4 …+const get = require('lodash/get')
5 …+const NAME = 'channels'
6 …+const VERSION = 1
7 …+
8 …+const getAuthor = (msg) => get(msg, 'value.author')
9 …+const getContent = (msg) => get(msg, 'value.content')
10 …+const getTimestamp = (msg) => get(msg, 'value.timestamp')
11 …+
12 …+module.exports = {
13 …+ name: NAME,
14 …+ version: VERSION,
15 …+ manifest: {
16 …+ read: 'source',
17 …+ subscriptions: 'source',
18 …+ getUserSubscriptions: 'async',
19 …+ popular: 'async'
20 …+ },
21 …+ init: function (server, config) {
22 …+ const view = server._flumeUse(
23 …+ NAME,
24 …+ flumeView(VERSION, map)
25 …+ )
26 …+
27 …+ return { read: view.read, subscriptions, popular }
28 …+
29 …+ function map (msg, seq) {
30 …+ const content = getContent(msg)
31 …+ if (isChannelSubscription()) {
32 …+ return [
33 …+ [content.channel, getAuthor(msg), getTimestamp(msg), content.subscribed]
34 …+ ]
35 …+ }
36 …+
37 …+ function isChannelSubscription () {
38 …+ return content.channel &&
39 …+ (typeof content.subscribed !== undefined)
40 …+ }
41 …+ }
42 …+
43 …+ function subscriptions (opts) {
44 …+ const query = Object.assign({}, {
45 …+ live: true,
46 …+ keys: true,
47 …+ values: false,
48 …+ seq: false
49 …+ }, opts)
50 …+
51 …+ return view.read(query)
52 …+ }
53 …+
54 …+ function getUserSubscriptions (feedId, cb) {
55 …+ pull(
56 …+ view.read({ keys: false, values: true }),
57 …+ pull.collect((err, msgs) => {
58 …+
59 …+ })
60 …+ )
61 …+ }
62 …+
63 …+ function popular (opts, cb) {
64 …+ if (typeof opts === 'function') return popular({}, opts)
65 …+ // opts = Object.assign({}, opts, { keys: true, values: false, seq: false })
66 …+ }
67 …+
68 …+ }
69 …+}
70 …+
71 …+ // function subscriptions (opts) {
72 …+ // const query = Object.assign({}, {
73 …+ // live: true,
74 …+ // keys: true,
75 …+ // values: false,
76 …+ // seq: false
77 …+ // }, opts)
78 …+
79 …+ // var source = defer.source(query)
80 …+
81 …+ // // Do a { live: false } request to get collection of current subscribed channels
82 …+ // var getOpts = { live: false, keys: false, values: false, seq: false }
83 …+
84 …+ // getSubscribedChannels(getOpts, (err, msgs) => {
85 …+ // if (err) throw err
86 …+
87 …+ // source.resolve(
88 …+ // // pull stream without a sink returns a source
89 …+ // pull(
90 …+ // pull.values(msgs),
91 …+ // pull.filter(msg => !msg.sync)
92 …+ // )
93 …+ // )
94 …+ // })
95 …+
96 …+ // // Return collection as source to a pull stream
97 …+ // return source
98 …+ // }
99 …+
100 …+ // function getSubscribedChannels (opts, cb) {
101 …+ // // reduced state of subscriptions to be up to date
102 …+ // pull(
103 …+ // view.read(opts),
104 …+ // pull.collect((err, msgs) => {
105 …+ // if (err) return cb(err)
106 …+ // // return an up to date collection
107 …+ // cb(null, msgs)
108 …+ // })
109 …+ // )
110 …+ // }
difficult/ex2/index.test.jsView
@@ -1,0 +1,121 @@
1 …+const test = require('tape')
2 …+const Server = require('scuttle-testbot')
3 …+const pull = require('pull-stream')
4 …+
5 …+test('[Difficult] Exercise 2 - Get a live stream list of channels a given user is subscribed to', assert => {
6 …+ Server.use(require('./index'))
7 …+ const server = Server()
8 …+ // A channel can be subscribed to and unsubscribed from,
9 …+ // therefore we need to draw the current state of a user's relationship with a given channel
10 …+
11 …+ assert.plan(1)
12 …+
13 …+ // Construct two independent identities to ensure we narrow the field
14 …+ const grace = server.createFeed()
15 …+ const elvis = server.createFeed()
16 …+
17 …+ // Pre-populate before setting up live stream
18 …+ grace.publish({ type: 'channel', channel: 'mycology', subscribed: true }, (err, msg) => {
19 …+ grace.publish({ type: 'channel', channel: 'mycology', subscribed: false }, (err, msg) => {
20 …+
21 …+ var collection
22 …+
23 …+ pull(
24 …+ server.channels.read({ values: false, keys: true, live: true }),
25 …+ pull.filter(msg => !msg.sync),
26 …+ pull.filter(msg => msg.key !== undefined), // no idea why { key: undefined, seq: undefined } is coming through
27 …+ pull.drain(msg => {
28 …+ collection = reduce(collection, msg)
29 …+
30 …+ if (msg.key[0] === 'ruby') {
31 …+ result = {}
32 …+ result[grace.id] = [
33 …+ { channel: 'mycology', subscribed: true },
34 …+ { channel: 'ruby', subscribed: true }
35 …+ ]
36 …+ result[elvis.id] = [
37 …+ { channel: 'mycology', subscribed: true },
38 …+ { channel: 'scuttlebutt', subscribed: false }
39 …+ ]
40 …+
41 …+ assert.deepEqual(collection, result)
42 …+ server.close()
43 …+ }
44 …+
45 …+ function reduce (collection, msg) {
46 …+ collection = collection || {}
47 …+ const [ channel, author, timestamp, subscribed ] = msg.key
48 …+ collection[author] = collection[author] || []
49 …+ var channelIndex = collection[author].findIndex(sub => sub.channel === channel)
50 …+ if (channelIndex !== -1) collection[author][channelIndex].subscribed = subscribed
51 …+ else collection[author].push({ channel, subscribed })
52 …+ return collection
53 …+ }
54 …+
55 …+ })
56 …+ )
57 …+
58 …+ grace.publish({ type: 'channel', channel: 'mycology', subscribed: true }, (err, msg) => {
59 …+ elvis.publish({ type: 'channel', channel: 'mycology', subscribed: true }, (err, msg) => {
60 …+ elvis.publish({ type: 'channel', channel: 'scuttlebutt', subscribed: true }, (err, msg) => {
61 …+ elvis.publish({ type: 'channel', channel: 'scuttlebutt', subscribed: false }, (err, msg) => {
62 …+ grace.publish({ type: 'channel', channel: 'ruby', subscribed: true }, () => {
63 …+ // these should now stream through to live pull stream above
64 …+ })
65 …+ })
66 …+ })
67 …+ })
68 …+ })
69 …+ })
70 …+ })
71 …+})
72 …+
73 …+// test('get a list of channels ordered by how many people subscribed to each', assert => {
74 …+// Server.use(require('./index'))
75 …+// const server = Server()
76 …+
77 …+// assert.plan(1)
78 …+
79 …+// var grace = server.createFeed()
80 …+// var elvis = server.createFeed()
81 …+
82 …+
83 …+// function cb (msg) {
84 …+// server.channels.popular
85 …+// }
86 …+
87 …+// server.close()
88 …+// assert.end()
89 …+// })
90 …+
91 …+// (source) get a list of channels a given user is subscribed to
92 …+// this needs to be a live stream in some way
93 …+// probably the reduced state of channels you're currently subscribed to, then { sync: true } followed by live updates from now on... (to discuss)
94 …+// (async) a list of all channels
95 …+// ordered by how many subscribed to each
96 …+
97 …+// grace.publish({ type: 'post', channel: 'mycology', text: 'fly agarics all over' }, (err, msg) => {
98 …+// elvis.publish({ type: 'post', channel: 'mycology', text: 'lets talk about clathrus archerii' }, (err, msg) => {
99 …+// elvis.publish({ type: 'post', channel: 'mycology', text: 'no lets talk about stinkhorns' }, (err, msg) => {
100 …+// elvis.publish({ type: 'post', channel: 'mycology', text: 'id like to talk about mycelium' }, (err, msg) => {
101 …+ // // Get current state
102 …+ // pull(
103 …+ // server.channels.subscriptions({ live: false }),
104 …+ // pull.collect((err, collection) => {
105 …+ // // Stream new messages
106 …+ // pull(
107 …+ // server.channels.subscriptions({ live: true }), // defaults to { live: true }
108 …+ // pull.filter(msg => !msg.sync),
109 …+ // pull.drain(msg => {
110 …+ // console.log(msg)
111 …+ // collection.reduce((state, msg) => {
112 …+
113 …+ // }, {})
114 …+ // if (msg.key[0] === 'ruby') {
115 …+ // assert.end()
116 …+ // server.close()
117 …+ // }
118 …+ // })
119 …+ // )
120 …+ // })
121 …+ // )
package.jsonView
@@ -18,8 +18,9 @@
1818 … "homepage": "https://github.com/ssbc/ssb-testing-guide#readme",
1919 … "dependencies": {
2020 … "flumeview-level": "^3.0.4",
2121 … "flumeview-reduce": "^1.3.13",
22 …+ "lodash": "^4.17.10",
2223 … "pull-stream": "^3.6.8",
2324 … "scuttle-testbot": "^1.1.6",
2425 … "ssb-backlinks": "^0.7.1",
2526 … "ssb-sort": "^1.1.0",

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