refactor: replace async with light weight alternatives

package.json

@@ -43,19 +43,20 @@
     "chai": "^3.5.0",
     "fs-blob-store": "^5.2.1",
     "idb-plus-blob-store": "^1.1.2",
+    "ipfs-block": "^0.3.0",
     "ipfs-repo": "^0.7.1",
     "lodash": "^4.8.2",
     "ncp": "^2.0.0",
     "pre-commit": "^1.1.2",
-    "ipfs-block": "^0.3.0",
-    "rimraf": "^2.5.1"
+    "rimraf": "^2.5.1",
+    "run-series": "^1.1.4"
   },
   "dependencies": {
-    "async": "^1.5.2"
+    "run-parallel-limit": "^1.0.3"
   },
   "contributors": [
     "David Dias <[email protected]>",
     "Friedel Ziegelmayer <[email protected]>",
     "Stephen Whitmore <[email protected]>"
   ]
-}
+}

src/index.js

@@ -1,6 +1,6 @@
 'use strict'
 
-const async = require('async')
+const parallelLimit = require('run-parallel-limit')
 
 // BlockService is a hybrid block datastore. It stores data in a local
 // datastore and may retrieve data from a remote Exchange.
@@ -41,9 +41,9 @@ module.exports = class BlockService {
       return callback(new Error('expects an array of Blocks'))
     }
 
-    async.eachLimit(blocks, 100, (block, next) => {
+    parallelLimit(blocks.map((block) => (next) => {
       this.addBlock(block, next)
-    }, callback)
+    }), 100, callback)
   }
 
   getBlock (key, extension, callback) {
@@ -71,15 +71,15 @@ module.exports = class BlockService {
 
     var results = {}
 
-    async.eachLimit(multihashes, 100, (multihash, next) => {
+    parallelLimit(multihashes.map((multihash) => (next) => {
       this.getBlock(multihash, extension, (err, block) => {
         results[multihash] = {
           err: err,
           block: block
         }
         next()
       })
-    }, (err) => {
+    }), 100, (err) => {
       callback(err, results)
     })
   }
@@ -98,9 +98,9 @@ module.exports = class BlockService {
       return callback(new Error('Invalid batch of multihashes'))
     }
 
-    async.eachLimit(multihashes, 100, (multihash, next) => {
+    parallelLimit(multihashes.map((multihash) => (next) => {
       this.deleteBlock(multihash, extension, next)
-    }, (err) => {
+    }), 100, (err) => {
       callback(err)
     })
   }

test/browser.js

@@ -1,7 +1,7 @@
 /* eslint-env mocha */
 'use strict'
 
-const async = require('async')
+const series = require('run-series')
 const store = require('idb-plus-blob-store')
 const _ = require('lodash')
 const IPFSRepo = require('ipfs-repo')
@@ -31,7 +31,7 @@ describe('IPFS Repo Tests on the Browser', function () {
     const mainBlob = store('ipfs')
     const blocksBlob = store('ipfs/blocks')
 
-    async.eachSeries(repoData, (file, cb) => {
+    series(repoData.map((file) => (cb) => {
       if (_.startsWith(file.key, 'datastore/')) {
         return cb()
       }
@@ -44,7 +44,7 @@ describe('IPFS Repo Tests on the Browser', function () {
       blob.createWriteStream({
         key: key
       }).end(file.value, cb)
-    }, done)
+    }), done)
   })
 
   const repo = new IPFSRepo('ipfs', {stores: store})