git ssb

1
var pull = require('pull-stream')
2
var paramap = require('pull-paramap')
3
var asyncMemo = require('asyncmemo')
4
var issueSchemas = require('./lib/schemas')
5
6
function Cache(fn, ssb) {
7
  return asyncMemo(fn)
8
  return function (key, cb) { ac.get(key, cb) }
9
}
10
11
function isUpdateValid(issue, msg) {
12
  return msg.value.author == issue.author
13
      || msg.value.author == issue.projectAuthor
14
}
15
16
exports.name = 'issues'
17
18
exports.manifest = {
19
  get: 'async',
20
  createFeedStream: 'source',
21
  new: 'async',
22
  edit: 'async',
23
  close: 'async',
24
  reopen: 'async',
25
  getMention: 'sync',
26
  isStatusChanged: 'sync'
27
}
28
29
exports.schemas = issueSchemas
30
31
function isStatusChanged(msg, issue) {
32
  var mention = getMention(msg, issue)
33
  return mention ? mention.open : null
34
}
35
36
function getMention(msg, issue) {
37
  var c = msg.value.content
38
  if (msg.key == issue.id || c.issue == issue.id || c.link == issue.id)
39
    if (c.open != null)
40
      return c
41
  if (c.issues) {
42
    var mention
43
    for (var i = 0; i < c.issues.length; i++) {
44
      mention = getMention({value: {
45
        timestamp: msg.value.timestamp,
46
        author: msg.value.author,
47
        content: c.issues[i]
48
      }}, issue)
49
      if (mention)
50
        return mention
51
    }
52
  }
53
}
54
55
exports.init = function (ssb) {
56
57
  var ssbGet = asyncMemo(ssb.get)
58
59
  var getIssue = asyncMemo(function (id, cb) {
60
    var issue = {}
61
    var issueMsg
62
63
    ssbGet(id, function (err, msg) {
64
      msg = {key: id, value: msg}
65
      if (err) return cb(err)
66
      issueMsg = msg
67
      issue.id = msg.key
68
      issue.author = msg.value.author
69
      var c = msg.value.content
70
      issue.project = c.project
71
      issue.text = c.text
72
      issue.created_at = issue.updated_at = msg.value.timestamp
73
      if (c.project)
74
        ssbGet(c.project, gotProjectMsg)
75
      else
76
        getLinks()
77
    })
78
79
    function gotProjectMsg(err, msg) {
80
      if (err) return cb(err)
81
      issue.projectAuthor = msg.author
82
      getLinks()
83
    }
84
85
    function getLinks() {
86
      var now = Date.now()
87
      // compute the result from the past data
88
      pull(
89
        ssb.links({dest: id, lt: now, reverse: true, values: true}),
90
        pull.drain(onOldMsg, onOldEnd)
91
      )
92
      // keep the results up-to-date in the future
93
      pull(
94
        ssb.links({dest: id, gte: now, values: true, live: true}),
95
        pull.drain(onNewMsg, onNewEnd)
96
      )
97
    }
98
99
    function onOldMsg(msg) {
100
      if (!isUpdateValid(issue, msg))
101
        return
102
      var c = msg.value.content
103
104
      // handle updates to issue
105
      if (msg.key == id || c.issue == id || c.link == id) {
106
        if (c.open != null && issue.open == null)
107
          issue.open = c.open
108
        if (c.title != null && issue.title == null)
109
          issue.title = c.title
110
        if (msg.value.timestamp > issue.updated_at)
111
          issue.updated_at = msg.value.timestamp
112
      }
113
114
      // handle updates via mention
115
      if (c.issues) {
116
        for (var i = 0; i < c.issues.length; i++)
117
          onOldMsg({value: {
118
            timestamp: msg.value.timestamp,
119
            author: msg.value.author,
120
            content: c.issues[i]
121
          }})
122
      }
123
124
      checkReady()
125
    }
126
127
    function onNewMsg(msg) {
128
      if (!isUpdateValid(issue, msg))
129
        return
130
      var c = msg.value.content
131
132
      // handle updates to issue
133
      if (msg.key == id || c.issue == id || c.link == id) {
134
        if (c.open != null)
135
          issue.open = c.open
136
        if (c.title != null)
137
          issue.title = c.title
138
        if (msg.value.timestamp > issue.updated_at)
139
          issue.updated_at = msg.value.timestamp
140
      }
141
142
      // handle updates via mention
143
      if (c.issues) {
144
        for (var i = 0; i < c.issues.length; i++)
145
          onNewMsg({value: {
146
            timestamp: msg.value.timestamp,
147
            author: msg.value.author,
148
            content: c.issues[i]
149
          }})
150
      }
151
    }
152
153
    function checkReady() {
154
      // call back once all the issue properties are set
155
      if (issue.open != null && issue.title != null) {
156
        var _cb = cb
157
        delete cb
158
        _cb(null, issue)
159
      }
160
    }
161
162
    function onOldEnd(err) {
163
      if (err) {
164
        if (cb) cb(err)
165
        else console.error(err)
166
        return
167
      }
168
      // process the root message last
169
      onOldMsg(issueMsg)
170
      // if callback hasn't been called yet, the issue is missing a field
171
      if (cb) {
172
        if (issue.open == null)
173
          issue.open = true
174
        if (issue.title == null)
175
          issue.title = issue.id
176
        checkReady()
177
      }
178
    }
179
180
    function onNewEnd(err) {
181
      if (err) {
182
        if (cb) cb(err)
183
        else console.error(err)
184
      }
185
    }
186
  })
187
188
  function createFeedStream(opts) {
189
    opts.type = 'issue'
190
    delete opts.limit
191
    return pull(
192
      // TODO: use links2 for this
193
      ssb.messagesByType(opts),
194
      pull.filter(function (msg) {
195
        return (!opts.project || opts.project == msg.value.content.project)
196
          && (!opts.author || opts.author == msg.value.author)
197
      }),
198
      paramap(function (msg, cb) {
199
        getIssue(msg.key, cb)
200
      }, 8)
201
    )
202
  }
203
204
  function editIssue(id, opts, cb) {
205
    var msg
206
    try { ssb.publish(issueSchemas.edit(id, opts), cb) }
207
    catch(e) { return cb(e) }
208
  }
209
210
  function closeIssue(id, cb) {
211
    var msg
212
    try { ssb.publish(issueSchemas.close(id), cb) }
213
    catch(e) { return cb(e) }
214
  }
215
216
  function reopenIssue(id, cb) {
217
    var msg
218
    try { msg = issueSchemas.reopen(id) }
219
    catch(e) { return cb(e) }
220
    ssb.publish(msg, cb)
221
  }
222
223
  function newIssue(opts, cb) {
224
    var msg
225
    try { msg = issueSchemas.new(opts.project, opts.title, opts.text) }
226
    catch(e) { return cb(e) }
227
    ssb.publish(msg, function (err, msg) {
228
      if (err) return cb(err)
229
      getIssue(msg.key, cb)
230
    })
231
  }
232
233
  return {
234
    get: getIssue,
235
    createFeedStream: createFeedStream,
236
    new: newIssue,
237
    edit: editIssue,
238
    close: closeIssue,
239
    reopen: reopenIssue,
240
    getMention: getMention,
241
    isStatusChanged: isStatusChanged
242
  }
243
}
244