git ssb

1
var SecureUrl = require('./fetch')
2
var u = require('./util')
3
4
module.exports = function (prefix, store, log) {
5
  var appname = prefix
6
  var wb, running = false
7
8
  //destroy everything
9
  function scorchedEarth () {
10
    for(var k in localStorage) {
11
      delete localStorage[k]
12
    }
13
  }
14
  function onProgress (ev) {
15
    wb.onprogress && wb.onprogress(ev)
16
  }
17
18
  var init = '#'+appname+'_INIT'
19
20
  return wb = {
21
    scorchedEarth: scorchedEarth,
22
    isInit: function () {
23
      return location.hash.substring(0, init.length) === init
24
    },
25
    setup: function () {
26
      if(!wb.isInit())
27
      location.hash = init + location.hash
28
      location.reload()
29
    },
30
    reinitialize: function (cb) {
31
      delete localStorage[appname+'_current']
32
      store.destroy(cb)
33
    },
34
    install: function (url, cb) {
35
      onProgress('installing from:'+url)
36
      var id = SecureUrl.isSecureUrl(url)
37
      if(!id) return cb(new Error('not a secure url:'+url))
38
      //check whether we already have this
39
      //before downloading anything
40
      store.get(id, function (err, data) {
41
        if(!err) return cb(null, data, id)
42
        SecureUrl(url, function (err, data, id) {
43
          if(err) cb(err)
44
          else store.add(data, id, function (err) {
45
            cb(err, data, id)
46
          })
47
        })
48
      })
49
    },
50
    installAndRun(url, cb) {
51
      wb.install(url, function (err, _, id) {
52
        if(err) cb(err)
53
        else wb.run(id, cb)
54
      })
55
    },
56
    add: store.add,
57
    run: function (id, cb) {
58
      if(!id) return cb(new Error('WebBoot.run: id must be provided'))
59
      var _id
60
      //if we are already running, restart
61
      //clear out init code, if we are in setup mode
62
      if(wb.isInit())
63
        location.hash = location.hash.substring(init.length)
64
65
      log.head(function (err, data) {
66
        if(err) return cb(err)
67
        if(data) _id = data.value
68
        if(_id === id)
69
          run(id)
70
        else
71
          log.append(id, function (err) {
72
            if(err) return cb(err)
73
            run(id)
74
          })
75
      })
76
77
      function run (id) {
78
        if(running) {
79
          //reload, and then the current version will trigger.
80
          cb()
81
          location.reload()
82
        }
83
        else
84
          store.get(id, function (err, data) {
85
            if(err) return cb(err)
86
            var script = document.createElement('script')
87
            running = true
88
            document.body.innerHTML = ''
89
            script.textContent = u.toUtf8(data)
90
            document.head.appendChild(script) //run javascript.
91
            cb()
92
          })
93
      }
94
    },
95
    size: function (cb) {
96
      store.ls(function (err, ls) {
97
        if(err) cb(err)
98
        else cb(null, ls.reduce(function (total, item) {
99
          return total + item.size
100
        }, 0))
101
      })
102
    },
103
    //clear target amount of space.
104
    prune: function (target, cb) {
105
      if(!target) return cb(new Error('WebBoot.prune: size to clear must be provided'))
106
      var cleared = 0, remove = []
107
      
108
      function clear () {
109
        var n = remove.length
110
        while(remove.length) store.rm(remove.shift(), function () {
111
          if(--n) return
112
          if(cleared < target)
113
            cb(new Error('could not clear requested space'), cleared)
114
          else
115
            cb(null, cleared)
116
        })
117
      }
118
119
      store.ls(function (err, ls) {
120
        if(err) return cb(err)
121
        log.unfiltered(function (err, unfiltered) {
122
          var stored = unfiltered.reverse()
123
          for(var i = 0; i < stored.length; i++) {
124
            var id = stored[i].value
125
            var item = ls.find(function (e) {
126
              return e.id === id
127
            })
128
            
129
            if(item) {
130
              cleared += item.size
131
              remove.push(id)
132
              if(cleared >= target) return clear()
133
            }
134
          }
135
          clear()
136
        })
137
      })
138
    },
139
140
    version: require('./package.json').version,
141
    remove: store.rm,
142
    has: store.has,
143
    versions: function (cb) {
144
      log.filtered(function (err, ls) {
145
        if(err) return cb(err)
146
        else if(ls.length) cb(null, ls)
147
        else {
148
          console.log('restore from legacy log...')
149
          var versions = u.parse(localStorage[appname+'_versions'])
150
          var n = Object.keys(versions).length
151
          for(var ts in versions) {
152
            log._append(versions[ts], function () {
153
              if(--n) return
154
              //try again
155
              log.filtered(cb)
156
            })
157
          }
158
        }
159
      })
160
    },
161
    history: log.unfiltered,
162
    current: log.head,
163
    append: log.append,
164
    revert: log.revert,
165
    onprogress: null
166
  }
167
}
168
169
170
171
172
173