examples: add sse

README.md

@@ -397,7 +397,7 @@ app.model({
     }
   ],
   effects: {
-    'sse:close': () => stream.close()
+    'sse:close': () => stream.close(),
     'app:error': (state, event) => console.error(`error: ${event.payload}`),
     'app:print': (state, event) => console.log(`sse: ${event.payload}`)
   }

examples/sse/client.js

@@ -0,0 +1,46 @@
+const choo = require('../../')
+
+const app = choo()
+app.model(createModel())
+app.router((route) => [
+  route('/', mainView)
+])
+
+const tree = app.start()
+document.body.appendChild(tree)
+
+function mainView (params, state, send) {
+  return choo.view`
+    <div>${state.logger.msg}</div>
+  `
+}
+
+function createModel () {
+  const stream = new window.EventSource('/sse')
+  return {
+    namespace: 'logger',
+    state: {
+      msg: ''
+    },
+    subscriptions: [
+      function (send) {
+        stream.onerror = (e) => {
+          send('logger:error', { payload: JSON.stringify(e) })
+        }
+        stream.onmessage = (e) => {
+          const msg = JSON.parse(e.data).message
+          send('logger:print', { payload: msg })
+        }
+      }
+    ],
+    reducers: {
+      'print': (action, state) => {
+        return ({ msg: state.msg + ' ' + action.payload })
+      }
+    },
+    effects: {
+      close: () => stream.close(),
+      error: (action, state) => console.error(`error: ${action.payload}`)
+    }
+  }
+}

examples/sse/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "http",
+  "private": true,
+  "main": "client.js",
+  "scripts": {
+    "start": "NODE_ENV=development node server.js"
+  },
+  "dependencies": {
+    "bankai": "^2.0.2",
+    "browserify": "^13.0.1",
+    "server-router": "^2.1.0",
+    "sse": "0.0.6"
+  }
+}

examples/sse/server.js

@@ -0,0 +1,55 @@
+const serverRouter = require('server-router')
+const browserify = require('browserify')
+const bankai = require('bankai')
+const http = require('http')
+const SSE = require('sse')
+
+const clients = []
+const PORT = 8080
+
+const server = http.createServer(createRouter())
+server.listen(PORT, () => {
+  process.stdout.write(`listening on port ${PORT}\n`)
+  var sse = new SSE(server)
+
+  // code adapted from: https://github.com/markbrown4/server-sent-events-demo
+  sse.on('connection', (stream) => {
+    clients.push(stream)
+    console.log('Opened connection 🎉')
+
+    var json = JSON.stringify({ message: 'Gotcha' })
+    stream.send(json)
+    console.log('Sent: ' + json)
+
+    stream.on('close', () => {
+      clients.splice(clients.indexOf(stream), 1)
+      console.log('Closed connection 😱')
+    })
+  })
+})
+
+// emit data every 1.5 seconds
+setInterval(() => {
+  var json = JSON.stringify({ message: 'Hello hello!' })
+  clients.forEach((stream) => {
+    stream.send(json)
+    console.log('Sent: ' + json)
+  })
+}, 1500)
+
+function createRouter () {
+  const router = serverRouter('/404')
+
+  const html = bankai.html({ css: false })
+  router.on('/', (req, res) => html(req, res).pipe(res))
+
+  const js = bankai.js(browserify, require.resolve('./client.js'))
+  router.on('/bundle.js', (req, res) => js(req, res).pipe(res))
+
+  router.on('/404', (req, res) => {
+    res.statusCode = 404
+    res.end('{ "message": "the server is confused" }')
+  })
+
+  return router
+}

examples/sse/views/main.js

@@ -0,0 +1,14 @@
+const choo = require('../../../')
+
+module.exports = function (params, state, send) {
+  const error = state.app.error[0]
+  const title = state.api.title
+  return choo.view`
+    <section>
+      <h1>${title}</h1>
+      <h2>Latest error: ${error}</h2>
+      <button onclick=${(e) => send('api:good')}>OK!</button>
+      <button onclick=${(e) => send('api:bad')}>Naughty</button>
+    </section>
+  `
+}