fix: case for empty file

package.json

@@ -63,7 +63,7 @@
     "lodash": "^4.17.4",
     "multihashes": "^0.3.2",
     "pull-batch": "^1.0.0",
-    "pull-block": "^1.0.2",
+    "pull-block": "^1.1.0",
     "pull-pair": "^1.1.0",
     "pull-paramap": "^1.2.1",
     "pull-pause": "0.0.0",

src/builder/balanced/balanced-reducer.js

@@ -20,7 +20,9 @@ module.exports = function balancedReduceToRoot (reduce, options) {
       result.push(roots[0])
       result.end()
     } else if (roots.length > 1) {
-      result.end(new Error('expected a maximum of 0 roots and got ' + roots.length))
+      result.end(new Error('expected a maximum of 1 roots and got ' + roots.length))
+    } else {
+      result.end()
     }
   })
 

src/builder/builder.js

@@ -1,7 +1,6 @@
 'use strict'
 
 const extend = require('deep-extend')
-const assert = require('assert')
 const UnixFS = require('ipfs-unixfs')
 const pull = require('pull-stream')
 const through = require('pull-through')
@@ -32,8 +31,10 @@ module.exports = function (createChunker, ipldResolver, createReducer, _options)
             if (err) {
               return cb(err)
             }
-            source.push(node)
-            files.push(node)
+            if (node) {
+              source.push(node)
+              files.push(node)
+            }
             cb()
           })
         }
@@ -43,8 +44,10 @@ module.exports = function (createChunker, ipldResolver, createReducer, _options)
           if (err) {
             return cb(err)
           }
-          source.push(node)
-          files.push(node)
+          if (node) {
+            source.push(node)
+            files.push(node)
+          }
           cb()
         })
       }), cb)
@@ -141,7 +144,6 @@ module.exports = function (createChunker, ipldResolver, createReducer, _options)
         if (err) {
           callback(err)
         } else {
-          assert.equal(roots.length, 1, 'should result in exactly one root')
           callback(null, roots[0])
         }
       })

src/builder/flat/index.js

@@ -1,6 +1,5 @@
 'use strict'
 
-const assert = require('assert')
 const pull = require('pull-stream')
 const pushable = require('pull-pushable')
 const pullPair = require('pull-pair')
@@ -20,9 +19,14 @@ module.exports = function (reduce, options) {
         result.end(err)
         return // early
       }
-      assert.equal(roots.length, 1, 'need one root')
-      result.push(roots[0])
-      result.end()
+      if (roots.length === 1) {
+        result.push(roots[0])
+        result.end()
+      } else if (roots.length > 1) {
+        result.end(new Error('expected a maximum of 1 roots and got ' + roots.length))
+      } else {
+        result.end()
+      }
     })
   )
 

src/builder/trickle/trickle-reducer.js

@@ -28,7 +28,9 @@ module.exports = function trickleReduceToRoot (reduce, options) {
           result.push(roots[0])
           result.end()
         } else if (roots.length > 1) {
-          result.end(new Error('expected a maximum of 0 roots and got ' + roots.length))
+          result.end(new Error('expected a maximum of 1 roots and got ' + roots.length))
+        } else {
+          result.end()
         }
       }
     })

src/chunker/fixed-size.js

@@ -4,5 +4,5 @@ const pullBlock = require('pull-block')
 
 module.exports = (options) => {
   let maxSize = (typeof options === 'number') ? options : options.maxChunkSize
-  return pullBlock(maxSize, { zeroPadding: false })
+  return pullBlock(maxSize, { zeroPadding: false, emitEmpty: true })
 }

test/test-importer.js

@@ -195,6 +195,22 @@ module.exports = (repo) => {
           }))
       })
 
+      it('doesn\'t yield anything on empty file', (done) => {
+        pull(
+          pull.values([{
+            path: 'emptyfile',
+            content: pull.empty()
+          }]),
+          importer(ipldResolver, options),
+          pull.collect((err, nodes) => {
+            expect(err).to.not.exist
+            expect(nodes.length).to.be.eql(1)
+            // always yield empty node
+            expect(mh.toB58String(nodes[0].multihash)).to.be.eql('QmfJMCvenrj4SKKRc48DYPxwVdS44qCUCqqtbqhJuSTWXP')
+            done()
+          }))
+      })
+
       it('fails on more than one root', (done) => {
         pull(
           pull.values([