docs: update examples (ipfs#2319)

Since I was going through these anyway to ensure they work with [0.37](ipfs#2192) I've updated the examples to use the new [`IPFS.create` constructor](https://github.com/ipfs/js-ipfs#ipfs-constructor) and switched to using the promised API so that we onboard new users to using promises and minimise the disruption caused when ipfs#1670 bubbles up to here.

License: MIT
Signed-off-by: Alan Shaw <alan.shaw@protocol.ai>

Author: Alan Shaw

examples/browser-add-readable-stream/index.js

@@ -3,39 +3,27 @@
 /* global Ipfs */
 /* eslint-env browser */
 
-const repoPath = `ipfs-${Math.random()}`
-const ipfs = new Ipfs({ repo: repoPath })
 const { Buffer } = Ipfs
 
-ipfs.on('ready', () => {
-  const directory = 'directory'
+const main = async () => {
+  const repoPath = `ipfs-${Math.random()}`
+  const ipfs = await Ipfs.create({ repo: repoPath })
 
-  // Our list of files
-  const files = createFiles(directory)
-
-  streamFiles(directory, files, (err, directoryHash) => {
-    if (err) {
-      return log(`There was an error adding the files ${err}`)
-    }
+  const directoryName = 'directory'
 
-    ipfs.ls(directoryHash, (err, files) => {
-      if (err) {
-        return log(`There was an error listing the files ${err}`)
-      }
+  // Our list of files
+  const inputFiles = createFiles(directoryName)
 
-      log(`
---
+  const directoryHash = await streamFiles(ipfs, directoryName, inputFiles)
 
-Directory contents:
+  const fileList = await ipfs.ls(directoryHash)
 
-${directory}/ ${directoryHash}`)
+  log(`\n--\n\nDirectory contents:\n\n${directoryName}/ ${directoryHash}`)
 
-      files.forEach((file, index) => {
-        log(` ${index < files.length - 1 ? '\u251C' : '\u2514'}\u2500 ${file.name} ${file.path} ${file.hash}`)
-      })
-    })
+  fileList.forEach((file, index) => {
+    log(` ${index < fileList.length - 1 ? '\u251C' : '\u2514'}\u2500 ${file.name} ${file.path} ${file.hash}`)
   })
-})
+}
 
 const createFiles = (directory) => {
   return [{
@@ -52,25 +40,30 @@ const createFiles = (directory) => {
   }]
 }
 
-const streamFiles = (directory, files, cb) => {
+const streamFiles = (ipfs, directory, files) => new Promise((resolve, reject) => {
   // Create a stream to write files to
   const stream = ipfs.addReadableStream()
-  stream.on('data', function (data) {
+
+  stream.on('data', (data) => {
     log(`Added ${data.path} hash: ${data.hash}`)
 
     // The last data event will contain the directory hash
     if (data.path === directory) {
-      cb(null, data.hash)
+      resolve(data.hash)
     }
   })
 
+  stream.on('error', reject)
+
   // Add the files one by one
   files.forEach(file => stream.write(file))
 
   // When we have no more files to add, close the stream
   stream.end()
-}
+})
 
 const log = (line) => {
   document.getElementById('output').appendChild(document.createTextNode(`${line}\r\n`))
 }
+
+main()

examples/browser-browserify/src/index.js

@@ -2,37 +2,30 @@
 
 const IPFS = require('ipfs')
 
-const node = new IPFS({ repo: String(Math.random() + Date.now()) })
+document.addEventListener('DOMContentLoaded', async () => {
+  const node = await IPFS.create({ repo: String(Math.random() + Date.now()) })
 
-node.once('ready', () => console.log('IPFS node is ready'))
+  console.log('IPFS node is ready')
 
-function store () {
-  const toStore = document.getElementById('source').value
+  async function store () {
+    const toStore = document.getElementById('source').value
 
-  node.add(Buffer.from(toStore), (err, res) => {
-    if (err || !res) {
-      return console.error('ipfs add error', err, res)
-    }
+    const res = await node.add(Buffer.from(toStore))
 
     res.forEach((file) => {
       if (file && file.hash) {
         console.log('successfully stored', file.hash)
         display(file.hash)
       }
     })
-  })
-}
-
-function display (hash) {
-  // buffer: true results in the returned result being a buffer rather than a stream
-  node.cat(hash, (err, data) => {
-    if (err) { return console.error('ipfs cat error', err) }
+  }
 
+  async function display (hash) {
+    // buffer: true results in the returned result being a buffer rather than a stream
+    const data = await node.cat(hash)
     document.getElementById('hash').innerText = hash
     document.getElementById('content').innerText = data
-  })
-}
+  }
 
-document.addEventListener('DOMContentLoaded', () => {
   document.getElementById('store').onclick = store
 })

examples/browser-create-react-app/package.json

@@ -5,7 +5,7 @@
   "dependencies": {
     "dot-prop": "^5.0.0",
     "ipfs": "file:../../",
-    "ipfs-css": "^0.12.0",
+    "ipfs-css": "^0.13.1",
     "react": "^16.8.0",
     "react-dom": "^16.8.0",
     "react-scripts": "3.0.1",

examples/browser-create-react-app/src/hooks/use-ipfs-factory.js

@@ -40,7 +40,7 @@ export default function useIpfsFactory ({ commands }) {
     } else {
       try {
         console.time('IPFS Started')
-        ipfs = await promiseMeJsIpfs(Ipfs, {})
+        ipfs = await Ipfs.create()
         console.timeEnd('IPFS Started')
       } catch (error) {
         console.error('IPFS init error:', error)
@@ -54,11 +54,3 @@ export default function useIpfsFactory ({ commands }) {
 
   return { ipfs, isIpfsReady, ipfsInitError }
 }
-
-function promiseMeJsIpfs (Ipfs, opts) {
-  return new Promise((resolve, reject) => {
-    const ipfs = new Ipfs(opts)
-    ipfs.once('ready', () => resolve(ipfs))
-    ipfs.once('error', err => reject(err))
-  })
-}

examples/browser-mfs/index.js

@@ -3,9 +3,6 @@
 /* eslint-env browser */
 
 const IPFS = require('ipfs')
-const ipfs = new IPFS({
-  repo: `ipfs-${Math.random()}`
-})
 const {
   dragDrop,
   log,
@@ -25,11 +22,15 @@ const {
 } = require('./forms')
 const mime = require('mime-sniffer')
 
-hideForms()
+document.addEventListener('DOMContentLoaded', async () => {
+  const ipfs = await IPFS.create({
+    repo: `ipfs-${Math.random()}`
+  })
+
+  hideForms()
 
-log('IPFS: Initialising')
+  log('IPFS: Initialising')
 
-ipfs.on('ready', () => {
   // Allow adding files to IPFS via drag and drop
   dragDrop(async (files) => {
     /* eslint-disable-next-line no-alert */

examples/browser-parceljs/package.json

@@ -26,6 +26,6 @@
     "babel-plugin-transform-regenerator": "^6.26.0",
     "babel-polyfill": "^6.26.0",
     "parcel-bundler": "^1.10.3",
-    "standard": "^12.0.1"
+    "standard": "^13.1.0"
   }
 }

examples/browser-parceljs/public/index.js

@@ -1,21 +1,21 @@
 import 'babel-polyfill'
 import IPFS from 'ipfs'
 
-// IPFS node setup
-const node = new IPFS({ repo: String(Math.random() + Date.now()) })
+document.addEventListener('DOMContentLoaded', async () => {
+  // IPFS node setup
+  const node = await IPFS.create({ repo: String(Math.random() + Date.now()) })
 
-// UI elements
-const status = document.getElementById('status')
-const output = document.getElementById('output')
+  // UI elements
+  const status = document.getElementById('status')
+  const output = document.getElementById('output')
 
-output.textContent = ''
+  output.textContent = ''
 
-function log (txt) {
-  console.info(txt)
-  output.textContent += `${txt.trim()}\n`
-}
+  function log (txt) {
+    console.info(txt)
+    output.textContent += `${txt.trim()}\n`
+  }
 
-node.on('ready', async () => {
   status.innerText = 'Connected to IPFS :)'
 
   const version = await node.version()

examples/browser-readablestream/index.js

@@ -3,18 +3,19 @@
 /* eslint-env browser */
 
 const Ipfs = require('../../')
-const videoStream = require('videostream')
-const ipfs = new Ipfs({ repo: 'ipfs-' + Math.random() })
+const VideoStream = require('videostream')
 const {
   dragDrop,
   statusMessages,
   createVideoElement,
   log
 } = require('./utils')
 
-log('IPFS: Initialising')
+document.addEventListener('DOMContentLoaded', async () => {
+  const ipfs = await Ipfs.create({ repo: 'ipfs-' + Math.random() })
+
+  log('IPFS: Initialising')
 
-ipfs.on('ready', () => {
   // Set up event listeners on the <video> element from index.html
   const videoElement = createVideoElement()
   const hashInput = document.getElementById('hash')
@@ -27,7 +28,7 @@ ipfs.on('ready', () => {
     log(`IPFS: Playing ${hashInput.value.trim()}`)
 
     // Set up the video stream an attach it to our <video> element
-    videoStream({
+    const videoStream = new VideoStream({
       createReadStream: function createReadStream (opts) {
         const start = opts.start
 
@@ -61,6 +62,8 @@ ipfs.on('ready', () => {
         return stream
       }
     }, videoElement)
+
+    videoElement.addEventListener('error', () => log(videoStream.detailedError))
   }
 
   // Allow adding files to IPFS via drag and drop

examples/browser-readablestream/utils.js

@@ -1,13 +1,14 @@
 'use strict'
 
-const { Buffer } = require('../../')
-
 const log = (line) => {
+  if (!line) return
+
   const output = document.getElementById('output')
   let message
 
   if (line.message) {
     message = `Error: ${line.message.toString()}`
+    console.error(line)
   } else {
     message = line
   }
@@ -29,40 +30,31 @@ const dragDrop = (ipfs) => {
     event.preventDefault()
   }
 
-  container.ondrop = (event) => {
+  container.ondrop = async (event) => {
     event.preventDefault()
 
-    Array.prototype.slice.call(event.dataTransfer.items)
+    const files = Array.from(event.dataTransfer.items)
       .filter(item => item.kind === 'file')
       .map(item => item.getAsFile())
-      .forEach(file => {
-        const progress = log(`IPFS: Adding ${file.name} 0%`)
-
-        const reader = new window.FileReader()
-        reader.onload = (event) => {
-          ipfs.add({
-            path: file.name,
-            content: Buffer.from(event.target.result)
-          }, {
-            progress: (addedBytes) => {
-              progress.textContent = `IPFS: Adding ${file.name} ${parseInt((addedBytes / file.size) * 100)}%\r\n`
-            }
-          }, (error, added) => {
-            if (error) {
-              return log(error)
-            }
-
-            const hash = added[0].hash
-
-            log(`IPFS: Added ${hash}`)
-
-            document.querySelector('#hash').value = hash
-          })
-        }
 
-        reader.readAsArrayBuffer(file)
+    for (const file of files) {
+      const progress = log(`IPFS: Adding ${file.name} 0%`)
+      const added = await ipfs.add({
+        path: file.name,
+        content: file
+      }, {
+        progress: (addedBytes) => {
+          progress.textContent = `IPFS: Adding ${file.name} ${parseInt((addedBytes / file.size) * 100)}%\r\n`
+        }
       })
 
+      const hash = added[0].hash
+
+      log(`IPFS: Added ${hash}`)
+
+      document.querySelector('#hash').value = hash
+    }
+
     if (event.dataTransfer.items && event.dataTransfer.items.clear) {
       event.dataTransfer.items.clear()
     }

examples/browser-script-tag/README.md

@@ -2,7 +2,7 @@
 
 You can use IPFS in your in-browser JavaScript code with just a `<script>` tag.
 
-```
+```html
 <script src="https://unpkg.com/ipfs/dist/index.min.js"></script>
 ```