From f0219b4c86b4b1583fd71536a984cbac03e4b8c3 Mon Sep 17 00:00:00 2001
From: Noah Loomans <noahloomans@gmail.com>
Date: Wed, 21 Feb 2018 19:56:49 +0100
Subject: Add pws slide

---
 slides/pws/script.js | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 slides/pws/script.js

(limited to 'slides/pws/script.js')

diff --git a/slides/pws/script.js b/slides/pws/script.js
new file mode 100644
index 0000000..3f95d00
--- /dev/null
+++ b/slides/pws/script.js
@@ -0,0 +1,44 @@
+const web3 = new Web3(new Web3.providers.HttpProvider('http://95.85.1.235:8545'));
+
+Reveal.initialize({
+  history: true,
+  backgroundTransition: 'slide'
+})
+
+function addToSlide(data, isHeader) {
+  const pre = document.createElement('pre');
+  if (isHeader) {
+    pre.classList.add('header');
+  }
+  pre.textContent = data;
+
+  document.querySelector('#blockchain').appendChild(pre);
+}
+
+function compactStr(str) {
+  return str.substr(0, 10) + '...' + str.substr(str.length - 10);
+}
+
+// addToSlide('012345678901234567890123456789012345678901234567890123456789')
+
+// Listen for incoming blocks.
+const filter = web3.eth.filter('latest');
+filter.watch((err, blockHash) => {
+  // New block created
+  if (err) {
+    throw err;
+  }
+
+  const block = web3.eth.getBlock(blockHash, true);
+  console.log(block);
+  addToSlide(`Block ${block.number}`, true);
+
+  block.transactions.forEach((transaction) => {
+    if (transaction.from == null || transaction.to == null) {
+      return;
+    }
+
+    const humanReadableValue = web3.fromWei(transaction.value, 'ether').toString();
+    addToSlide(`${compactStr(transaction.from)} -> ${humanReadableValue} ETHER -> ${compactStr(transaction.to)}`);
+  });
+});
-- 
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