Enhance waku_example.js

src/examples/simple/package.json

@@ -1,5 +1,5 @@
 {
   "dependencies": {
-    "nodejs-waku": "^0.1.11"
+    "nodejs-waku": "^0.1.12"
   }
 }

src/examples/simple/waku_example.js

@@ -1,51 +1,76 @@
 
+
+// Please, export LD_LIBRARY_PATH="./node_modules/nodejs-waku/"
+// before running the example so that the 'libwaku.so' can be properly linked.
+
+function create_random_string(length) {
+  let result = '';
+  const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+  const charactersLength = characters.length;
+  let counter = 0;
+  while (counter < length) {
+    result += characters.charAt(Math.floor(Math.random() * charactersLength));
+    counter += 1;
+  }
+  return result;
+}
+
+function event_handler(event) {
+  console.log("event rx: " + event)
+}
+
 var wakuMod = require('nodejs-waku');
-
-var cfg = `{
+wakuMod.wakuNew(`{
   "host": "0.0.0.0",
   "port": 60001,
-    "key": "364d111d729a6eb6d3e6113e163f017b5ef03a6f94c9b5b7bb1bb36fa5cb07a9",
+  "key": "364d111d729a6eb6d2e6113e163f017b5ef03a6f94c9b5b7bb1bb36fa5cb07a9",
   "relay": true
-}`;
-
-wakuMod.wakuNew(cfg);
+}`);
 
 wakuMod.wakuVersion();
 
-/*
-
-exports.wakuNew = function(cfg) {
-  wakuMod.wakuNew(cfg)
-}
-
-exports.wakuVersion = function() {
-  wakuMod.wakuVersion(function(msg){ console.log("Waku Version: " + msg) })
-}
-
-exports.wakuShowDefaultPubsubTopic = function() {
 // Example on how to retrieve a value from the waku library
 var defaultPubsubTopic = ""
 wakuMod.wakuDefaultPubsubTopic(function(msg){ defaultPubsubTopic = msg })
+
 console.log("Default pubsub topic: " + defaultPubsubTopic)
-}
 
-exports.wakuSetEventCallback = function(eventHandler) {
 console.log("Setting callback event callback function")
-  wakuMod.wakuSetEventCallback(eventHandler)
-}
+wakuMod.wakuSetEventCallback(event_handler)
 
-exports.wakuStart = function() {
 wakuMod.wakuStart()
-}
 
-exports.wakuConnect = function(peerAddr, timeoutMs, onErr) {
-  wakuMod.wakuConnect(peerAddr, timeoutMs, onErr)
-}
+wakuMod.wakuConnect("/ip4/127.0.0.1/tcp/60000/p2p/16Uiu2HAmVFXtAfSj4EiR7mL2KvL4EE2wztuQgUSBoj2Jx2KeXFLN",
+  10000,
+  function onErr(msg) {
+    console.log("Error connecting node: " + msg)
+  })
 
-exports.wakuRelaySubscribe = function(pubsubTopic, onErr) {
-  wakuMod.wakuRelaySubscribe(pubsubTopic, onErr)
-}
+wakuMod.wakuRelaySubscribe(defaultPubsubTopic,
+  function onErr(msg) {
+    console.log("Error subscribing: " + msg)
+  })
 
-*/
+var express = require('express');
+var app = express();
+app.post('/publish',
+function (req, res) {
+  console.log("Publish event received")
 
+  wakuMod.wakuRelayPublish(defaultPubsubTopic,
+    "content_topic_name",
+    create_random_string(10),
+    10000,
+    function onError(msg) {
+      console.log("Error: " + msg)
+      process.exit(-1)
+    });
 
+    res.end( JSON.stringify("OK publish"))
+  })
+
+var server = app.listen(8081, function () {
+  var host = server.address().address
+  var port = server.address().port
+  console.log("Example NodeJs waku listening at http://%s:%s", host, port)
+})