add createAddStream feature

package.json

@@ -45,7 +45,7 @@
     "form-data": "^1.0.0-rc3",
     "gulp": "^3.9.1",
     "idb-plus-blob-store": "^1.1.2",
-    "interface-ipfs-core": "^0.2.0",
+    "interface-ipfs-core": "^0.2.2",
     "left-pad": "^1.1.0",
     "lodash": "^4.11.2",
     "mocha": "^2.5.1",
@@ -67,7 +67,7 @@
     "glob": "^7.0.3",
     "hapi": "^13.4.1",
     "ipfs-bitswap": "^0.4.1",
-    "ipfs-api": "^5.0.0",
+    "ipfs-api": "^5.0.1",
     "ipfs-block": "^0.3.0",
     "ipfs-block-service": "^0.4.0",
     "ipfs-merkle-dag": "^0.6.0",

src/core/ipfs/files.js

@@ -1,22 +1,57 @@
 'use strict'
 
-const Importer = require('ipfs-unixfs-engine').importer
-const Exporter = require('ipfs-unixfs-engine').exporter
+const unixfsEngine = require('ipfs-unixfs-engine')
+const Importer = unixfsEngine.Importer
+const Exporter = unixfsEngine.Exporter
 const UnixFS = require('ipfs-unixfs')
 const bs58 = require('bs58')
 const through = require('through2')
 const isStream = require('isstream')
 const promisify = require('promisify-es6')
+const Duplex = require('stream').Duplex
 
 module.exports = function files (self) {
   return {
-    createAddStream: promisify((callback) => {
-      // TODO: wip
-      if (data === undefined) {
-        return new Importer(self._dagS)
+    createAddStream: (callback) => {
+      const i = new Importer(self._dagS)
+      const ds = new Duplex({ objectMode: true })
+
+      ds._read = (n) => {}
+      ds._write = (file, enc, next) => {
+        i.write(file)
+        next()
       }
-    }),
 
+      ds.end = () => {
+        i.end()
+      }
+
+      let counter = 0
+
+      i.on('data', (file) => {
+        counter++
+        self.object.get(file.multihash, (err, node) => {
+          if (err) {
+            return ds.emit('error', err)
+          }
+          ds.push({path: file.path, node: node})
+          counter--
+        })
+      })
+
+      i.on('end', () => {
+        function canFinish () {
+          if (counter === 0) {
+            ds.push(null)
+          } else {
+            setTimeout(canFinish, 100)
+          }
+        }
+        canFinish()
+      })
+
+      callback(null, ds)
+    },
     add: promisify((data, callback) => {
       // Buffer input
       if (Buffer.isBuffer(data)) {