Files: 6730668ae7223a39f319ed33a69019c0ef1d8c38 / poll / async / get.js
2671 bytesRaw
1 | const pull = require('pull-stream') |
2 | const sort = require('ssb-sort') |
3 | const isPoll = require('../../isPoll') |
4 | const isPosition = require('../../isPosition') |
5 | const isChooseOnePoll = require('../../poll/sync/isChooseOnePoll') |
6 | const { ERROR_POSITION_TYPE } = require('../../types') |
7 | const getResults = require('../../position/sync/chooseOneResults') |
8 | const getMsgContent = require('../../lib/getMsgContent') |
9 | |
10 | module.exports = function (server) { |
11 | return function get (key, cb) { |
12 | server.get(key, (err, value) => { |
13 | if (err) return cb(err) |
14 | |
15 | var poll = { key, value } |
16 | if (!isPoll(poll)) return cb(new Error('scuttle-poll could not fetch, key provided was not a valid poll key')) |
17 | |
18 | pull( |
19 | createBacklinkStream(key), |
20 | pull.collect((err, msgs) => { |
21 | if (err) return cb(err) |
22 | |
23 | cb(null, decoratedPoll(poll, msgs)) |
24 | }) |
25 | ) |
26 | }) |
27 | } |
28 | |
29 | function createBacklinkStream (key) { |
30 | var filterQuery = { |
31 | $filter: { |
32 | dest: key |
33 | } |
34 | } |
35 | |
36 | return server.backlinks.read({ |
37 | query: [filterQuery], |
38 | index: 'DTA' // use asserted timestamps |
39 | }) |
40 | } |
41 | } |
42 | |
43 | function decoratedPoll (rawPoll, msgs = []) { |
44 | const { author, content: { title, body } } = rawPoll.value |
45 | |
46 | const poll = Object.assign({}, rawPoll, { |
47 | author, |
48 | title, |
49 | body, |
50 | |
51 | positions: [], |
52 | results: {}, |
53 | errors: [] |
54 | |
55 | // publishPosition: TODO ? add pre-filled helper functions to the poll? |
56 | }) |
57 | |
58 | // TODO add missingContext warnings to each msg |
59 | msgs = sort(msgs) |
60 | |
61 | // filter position message into 'positions' and 'errors' |
62 | const type = poll.value.content.details.type |
63 | |
64 | poll.positions = msgs |
65 | .filter(msg => msg.value.content.root === poll.key) |
66 | .filter(isPosition[type]) |
67 | .map(position => { |
68 | return decoratePosition({position, poll}) |
69 | }) |
70 | |
71 | poll.errors = msgs |
72 | .filter(msg => msg.value.content.root === poll.key) |
73 | .filter(msg => isPosition(msg) && !isPosition[type](msg)) |
74 | .map(position => { |
75 | return { |
76 | type: ERROR_POSITION_TYPE, |
77 | message: `Position responses need to be off the ${type} type for this poll`, |
78 | position |
79 | } |
80 | }) |
81 | |
82 | const {results, errors} = getResults({ poll, positions: poll.positions }) |
83 | poll.results = results |
84 | poll.errors = poll.errors.concat(errors) |
85 | |
86 | return poll |
87 | } |
88 | |
89 | function decoratePosition ({position: rawPosition, poll: rawPoll}) { |
90 | var position = getMsgContent(rawPosition) |
91 | var poll = getMsgContent(rawPoll) |
92 | |
93 | var newPosition = Object.assign({}, rawPosition) |
94 | |
95 | if (isChooseOnePoll(poll)) { |
96 | var choiceIndex = position.details.choice |
97 | newPosition.choice = poll.details.choices[choiceIndex] |
98 | } |
99 | return newPosition |
100 | } |
101 |
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