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.msg = msg
69
      issue.author = msg.value.author
70
      var c = msg.value.content
71
      issue.project = c.project
72
      issue.text = c.text
73
      issue.created_at = issue.updated_at = msg.value.timestamp
74
      if (c.project)
75
        ssbGet(c.project, gotProjectMsg)
76
      else
77
        getLinks()
78
    })
79
80
    function gotProjectMsg(err, msg) {
81
      if (err) return cb(err)
82
      issue.projectAuthor = msg.author
83
      getLinks()
84
    }
85
86
    function getLinks() {
87
      var now = Date.now()
88
      // compute the result from the past data
89
      pull(
90
        ssb.links({dest: id, lt: now, reverse: true, values: true}),
91
        pull.drain(onOldMsg, onOldEnd)
92
      )
93
      // keep the results up-to-date in the future
94
      pull(
95
        ssb.links({dest: id, gte: now, values: true, live: true}),
96
        pull.drain(onNewMsg, onNewEnd)
97
      )
98
    }
99
100
    function onOldMsg(msg) {
101
      if (!isUpdateValid(issue, msg))
102
        return
103
      var c = msg.value.content
104
105
      // handle updates to issue
106
      if (msg.key == id || c.issue == id || c.link == id) {
107
        if (c.open != null && issue.open == null)
108
          issue.open = c.open
109
        if (c.title != null && issue.title == null)
110
          issue.title = c.title
111
        if (msg.value.timestamp > issue.updated_at)
112
          issue.updated_at = msg.value.timestamp
113
      }
114
115
      // handle updates via mention
116
      if (c.issues) {
117
        for (var i = 0; i < c.issues.length; i++)
118
          onOldMsg({value: {
119
            timestamp: msg.value.timestamp,
120
            author: msg.value.author,
121
            content: c.issues[i]
122
          }})
123
      }
124
125
      checkReady()
126
    }
127
128
    function onNewMsg(msg) {
129
      if (!isUpdateValid(issue, msg))
130
        return
131
      var c = msg.value.content
132
133
      // handle updates to issue
134
      if (msg.key == id || c.issue == id || c.link == id) {
135
        if (c.open != null)
136
          issue.open = c.open
137
        if (c.title != null)
138
          issue.title = c.title
139
        if (msg.value.timestamp > issue.updated_at)
140
          issue.updated_at = msg.value.timestamp
141
      }
142
143
      // handle updates via mention
144
      if (c.issues) {
145
        for (var i = 0; i < c.issues.length; i++)
146
          onNewMsg({value: {
147
            timestamp: msg.value.timestamp,
148
            author: msg.value.author,
149
            content: c.issues[i]
150
          }})
151
      }
152
    }
153
154
    function checkReady() {
155
      // call back once all the issue properties are set
156
      if (issue.open != null && issue.title != null) {
157
        var _cb = cb
158
        delete cb
159
        _cb(null, issue)
160
      }
161
    }
162
163
    function onOldEnd(err) {
164
      if (err) {
165
        if (cb) cb(err)
166
        else console.error(err)
167
        return
168
      }
169
      // process the root message last
170
      onOldMsg(issueMsg)
171
      // if callback hasn't been called yet, the issue is missing a field
172
      if (cb) {
173
        if (issue.open == null)
174
          issue.open = true
175
        if (issue.title == null)
176
          issue.title = issue.id
177
        checkReady()
178
      }
179
    }
180
181
    function onNewEnd(err) {
182
      if (err) {
183
        if (cb) cb(err)
184
        else console.error(err)
185
      }
186
    }
187
  })
188
189
  function createFeedStream(opts) {
190
    opts.type = 'issue'
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