├── .gitignore ├── .travis.yml ├── LICENSE ├── README.md ├── client.js ├── index.html ├── index.js ├── iot.js ├── lib ├── api_gateway_form_mapping_template.txt ├── get.js └── save.js ├── package.json ├── style.css └── test ├── get.test.js ├── index.test.js └── save.test.js /.gitignore: -------------------------------------------------------------------------------- 1 | # Logs 2 | logs 3 | *.log 4 | npm-debug.log* 5 | 6 | # Runtime data 7 | pids 8 | *.pid 9 | *.seed 10 | 11 | # Directory for instrumented libs generated by jscoverage/JSCover 12 | lib-cov 13 | 14 | # Coverage directory used by tools like istanbul 15 | coverage 16 | 17 | # Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files) 18 | .grunt 19 | 20 | # node-waf configuration 21 | .lock-wscript 22 | 23 | # Compiled binary addons (http://nodejs.org/api/addons.html) 24 | build/Release 25 | 26 | # Dependency directory 27 | node_modules 28 | 29 | # Optional npm cache directory 30 | .npm 31 | 32 | # Optional REPL history 33 | .node_repl_history 34 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: node_js 2 | node_js: 3 | - "4.3.2" 4 | after_success: 5 | - bash <(curl -s https://codecov.io/bash) 6 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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Of course, the commands you use may 322 | be called something other than `show w' and `show c'; they could even be 323 | mouse-clicks or menu items--whatever suits your program. 324 | 325 | You should also get your employer (if you work as a programmer) or your 326 | school, if any, to sign a "copyright disclaimer" for the program, if 327 | necessary. Here is a sample; alter the names: 328 | 329 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 330 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 331 | 332 | {signature of Ty Coon}, 1 April 1989 333 | Ty Coon, President of Vice 334 | 335 | This General Public License does not permit incorporating your program into 336 | proprietary programs. If your program is a subroutine library, you may 337 | consider it more useful to permit linking proprietary applications with the 338 | library. If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # chat 2 | 3 | [![Build Status](https://travis-ci.org/dwyl/chat.svg?branch=master)](https://travis-ci.org/dwyl/chat) 4 | [![codecov](https://codecov.io/gh/dwyl/chat/branch/master/graph/badge.svg)](https://codecov.io/gh/dwyl/chat) 5 | [![Code Climate](https://codeclimate.com/github/dwyl/chat/badges/gpa.svg)](https://codeclimate.com/github/dwyl/chat) 6 | [![Dependency Status](https://david-dm.org/dwyl/chat.svg)](https://david-dm.org/dwyl/chat) 7 | [![devDependency Status](https://david-dm.org/dwyl/chat/dev-status.svg)](https://david-dm.org/dwyl/chat#info=devDependencies) 8 | 9 | 10 | > try it: https://dwyl.s3.amazonaws.com/index.html 11 | 12 | ## Why? 13 | 14 | ![there-is-no-cloud-1920](https://cloud.githubusercontent.com/assets/194400/14860763/1b723cb8-0ca2-11e6-9112-5593228db117.png) 15 | 16 | This repo is designed as a *showcase* for how to build apps that scale. 17 | 18 | We have built chat example apps a couple of times 19 | [*before*](https://github.com/dwyl/hapi-socketio-redis-chat-example) 20 | and the response has been good, 21 | this time our mission is to operate within a *very tight* set of ***constraints***: 22 | 23 | 1. No *Servers* 24 | 2. Progressive Enhancement (_Works when JavaScript is **OFF**_!) 25 | 3. Precisely Predictable (*Linear*) Performance 26 | 27 | ## What? 28 | 29 | Chat. Probably the simplest and easiets to scale implementation you will see ... 30 | unless you work 31 | for `{{ insert name of silicon valley unicorn messenger app here }}`. 32 | 33 | ## How? 34 | 35 | ### Lambda 36 | 37 | https://aws.amazon.com/lambda/ 38 | + Request Rate Exceeded: 39 | http://stackoverflow.com/questions/36826352/aws-lambda-toomanyrequestsexception-rate-exceeded/ 40 | 41 | ### S3 42 | 43 | We use S3 to render our initial page and host all our static content. 44 | https://aws.amazon.com/s3/ 45 | + Node.js SDK Examples: http://docs.aws.amazon.com/AWSJavaScriptSDK/guide/node-examples.html 46 | + Working with Folders: http://docs.aws.amazon.com/AmazonS3/latest/UG/FolderOperations.html 47 | 48 | ### API Gateway 49 | 50 | API Gateway routes the requests we make from the front-end through to 51 | the Lambda function that will process it. 52 | 53 | #### Body Mapping Templates 54 | 55 | In order to allow the data submitted by the client to flow through to the Lambda 56 | we need to define a 57 | ["Body Mapping Template"](http://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-mapping-template-reference.html). 58 | 59 | 60 | 61 | ##### `application/json` Body Mapping Template: 62 | ```js 63 | { 64 | ## extract all params in body as JSON; 65 | "body": $input.json('$'), 66 | "context" : { 67 | "method" : "$context.httpMethod", 68 | "path" : "$context.resourcePath", 69 | "stage" : "$context.stage", 70 | "source_ip" : "$context.identity.sourceIp", 71 | "user_agent" : "$context.identity.userAgent", 72 | "user_arn" : "$context.identity.userArn", 73 | "request_id" : "$context.requestId", 74 | "resource_id" : "$context.resourceId" 75 | }, 76 | "headers": { 77 | #foreach($param in $input.params().header.keySet()) 78 | "$param": "$util.escapeJavaScript($input.params().header.get($param))" #if($foreach.hasNext),#end 79 | #end 80 | } 81 | } 82 | ``` 83 | 84 | Once Body Mapping Template is enabled, test using `curl`: 85 | ```sh 86 | curl -v -H "Content-Type: application/json" -X POST -d '{"m":"Hello World!","n":"yourname","t":"123456"}' https://r09u5uw11g.execute-api.eu-west-1.amazonaws.com/prod/savemessage 87 | ``` 88 | 89 | With Authorization Header: 90 | ```sh 91 | curl -v -H "Content-Type: application/json" -X POST -d '{"m":"1348","n":"yourname","t":"12345678"}' -H "Authorization: eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6MSwibmFtZSI6IkFudGhvbnkgVmFsaWQgVXNlciIsImlhdCI6MTQyNTQ3MzUzNX0.KA68l60mjiC8EXaC2odnjFwdIDxE__iDu5RwLdN1F2A" https://r09u5uw11g.execute-api.eu-west-1.amazonaws.com/prod/savemessage 92 | ``` 93 | 94 | GET messages: 95 | ```js 96 | curl https://r09u5uw11g.execute-api.eu-west-1.amazonaws.com/prod/chat 97 | ``` 98 | 99 | curl -v -H "Content-Type: application/json" -X POST -d '{"m":"Hello World!","n":"yourname","t":"123456"}' https://r09u5uw11g.execute-api.eu-west-1.amazonaws.com/prod/chat 100 | 101 | + Overview: https://aws.amazon.com/api-gateway/ 102 | + SDK Docs: http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/APIGateway.html 103 | + HTTP Method: http://stackoverflow.com/questions/35252544/how-to-get-the-http-method-in-aws-lambda 104 | + Passing form data through API Gateway to Lambda: 105 | http://stackoverflow.com/questions/32057053/how-to-pass-a-params-from-post-to-aws-lambda-from-amazon-api-gateway 106 | which lead to: https://forums.aws.amazon.com/thread.jspa?messageID=673012 107 | + Headers: http://stackoverflow.com/questions/31372167/how-to-access-http-headers-for-request-to-aws-api-gateway-using-lambda 108 | + Velocity Template Language (for mapping): 109 | http://velocity.apache.org/engine/devel/vtl-reference-guide.html 110 | + `Could not parse request body into json` ... 111 | https://forums.aws.amazon.com/thread.jspa?threadID=221749 112 | 113 | 114 | 115 | ### IOT 116 | 117 | ### WebRTC? 118 | 119 | Over **50% of browsers** (Firefox & Chrome) which means 120 | we can cut-out paying for IOT messages for the people 121 | who are using good browsers. 122 | 123 | http://caniuse.com/#feat=rtcpeerconnection 124 | 125 | This also means when we use Electron 126 | 127 | ## How *much* ($£€) ? 128 | 129 | How much does all of this cost...? 130 | 131 | Let's break down the cost in the order of the Tech Stack. 132 | 133 | ### S3 134 | 135 | https://aws.amazon.com/s3/pricing/ 136 | 137 | ### API Gateway 138 | 139 | https://aws.amazon.com/api-gateway/pricing/ 140 | 141 | > What is a read/write capacity unit? 142 | http://aws.amazon.com/dynamodb/faqs/#What_is_a_readwrite_capacity_unit 143 | 144 | ### Lambda 145 | 146 | https://aws.amazon.com/lambda/pricing/ 147 | 148 | ### DynamoDB 149 | 150 | https://aws.amazon.com/dynamodb/pricing/ 151 | 152 | ### Cognito 153 | 154 | Amazon Cognito costs $0.15 for each 10,000 sync operations and $0.15 per GB of sync store per month. 155 | 156 | https://aws.amazon.com/cognito/pricing/ 157 | 158 | ### IOT 159 | 160 | $5 per million messages. 161 | 162 | A message is a 512-byte block of data processed by AWS IoT – either published to or delivered by the Service. For example, a 900-byte payload is billed as two messages. 163 | 164 | https://aws.amazon.com/iot/pricing/ 165 | 166 | 167 | 168 | ## Background Reading 169 | 170 | ### Learning by Doing 171 | 172 | + Access HTTP Headers: 173 | http://stackoverflow.com/questions/31372167/how-to-access-http-headers-for-request-to-aws-api-gateway-using-lambda 174 | + Cookies on Lambda: 175 | http://stackoverflow.com/questions/31851860/access-http-request-headers-query-string-cookies-body-object-in-lambda-with 176 | + Invoke Lambda by HTTP Request: 177 | http://stackoverflow.com/questions/29877220/invoke-a-aws-lambda-function-by-a-http-request 178 | + Render HTML in Lambda: 179 | http://kennbrodhagen.net/2016/01/31/how-to-return-html-from-aws-api-gateway-lambda/ 180 | + Render React on Lambda: 181 | https://medium.com/@devknoll/rendering-react-with-amazon-lambda-e4e85a788257 182 | 183 | ### Discussion 184 | 185 | We considered using S3 as our primary data store, but soon realized its not that "*simple*"... 186 | see: Why does S3 still not support Appending? https://news.ycombinator.com/item?id=10746969 187 | -------------------------------------------------------------------------------- /client.js: -------------------------------------------------------------------------------- 1 | var baseURL = 'https://r09u5uw11g.execute-api.eu-west-1.amazonaws.com/prod'; 2 | 3 | $( document ).ready(function() { 4 | 5 | function getName() { 6 | // prompt for person's name before allowing to post 7 | var name = Cookies.get('name'); 8 | if(!name || name === 'null') { 9 | name = window.prompt("What is your name/handle?"); 10 | Cookies.set('name', name); 11 | } 12 | // socket.emit('io:name', name); 13 | $( "#m" ).focus(); // focus cursor on the message input 14 | return name; 15 | } 16 | 17 | function leadZero(number) { 18 | return (number < 10) ? '0'+number : number; 19 | } 20 | 21 | function getTime(timestamp) { 22 | var t, h, m, s, time; 23 | t = new Date(timestamp); 24 | h = leadZero(t.getHours()); 25 | m = leadZero(t.getMinutes()); 26 | s = leadZero(t.getSeconds()); 27 | return '' + h + ':' + m + ':' + s; 28 | } 29 | 30 | function htmlEscape (str) { 31 | return str 32 | .replace(/&/g, "&") 33 | .replace(//g, ">") 35 | .replace(/"/g, """) 36 | .replace(/'/g, "'"); 37 | } 38 | 39 | /** 40 | * renders messages to the DOM 41 | * nothing fancy ... where's the React?! Don't Freak out! It works! 42 | */ 43 | function renderMessage(msg) { 44 | msg = JSON.parse(msg); 45 | var html = "
  • "; 46 | html += "" + getTime(msg.t) + " "; 47 | html += "" + htmlEscape(msg.n) + ": "; 48 | html += "" + htmlEscape(msg.m) + ""; 49 | html += "
    • "; 50 | $('#messages').append(html); // append to list 51 | return; 52 | } 53 | 54 | $('form').submit(function() { 55 | 56 | //if input is empty or white space do not send message 57 | if($('#m').val().match(/^[\s]*$/) !== null) { 58 | $('#m').val(''); 59 | $('#m').attr('placeholder', 'please enter your message here'); 60 | return false; 61 | } 62 | 63 | if(!Cookies.get('name') || Cookies.get('name').length < 1 || Cookies.get('name') === 'null') { 64 | getName(); 65 | return false; 66 | } else { 67 | var msg = $('#m').val(); 68 | socket.emit('io:message', msg); 69 | $('#m').val(''); // clear message form ready for next/new message 70 | $('#m').attr('placeholder', ''); //clears placeholder once a msg is successfully sent 71 | return false; 72 | } 73 | }); 74 | 75 | // keeps latest message at the bottom of the screen 76 | // http://stackoverflow.com/a/11910887/2870306 77 | function scrollToBottom () { 78 | $(window).scrollTop($('#messages').height()); 79 | } 80 | 81 | window.onresize = function(){ 82 | scrollToBottom(); 83 | } 84 | 85 | // socket.on('chat:messages:latest', function(msg) { 86 | // console.log(">> " +msg); 87 | // renderMessage(msg); 88 | // scrollToBottom(); 89 | // }); 90 | // 91 | // socket.on('chat:people:new', function(name) { 92 | // $('#joiners').show(); 93 | // $('#joined').text(name) 94 | // $('#joiners').fadeOut(5000); 95 | // }); 96 | 97 | getName(); 98 | 99 | function loadMessages() { 100 | $.get(baseURL + '/chat', function(data){ 101 | console.log(data); 102 | data.map(function(msg){ 103 | renderMessage(msg); 104 | }) 105 | scrollToBottom(); 106 | }) 107 | } 108 | loadMessages(); 109 | }); 110 | 111 | 112 | 113 | $(document).ready(function() { 114 | 115 | function getNotes () { 116 | 117 | $.ajax({ 118 | type: "GET", 119 | // headers: { 'x-api-key' : API_KEY }, 120 | url: baseURL + '/getmessages', 121 | dataType: "json", 122 | success: function(res, status, xhr) { 123 | console.log(' - - - - - - - - getNotes res:') 124 | console.log(res); 125 | $('#notes').val(res.notes) 126 | $('#form').fadeIn('slow'); // this is why I'm using jQuery ... feel free to remove. 127 | }, 128 | error: function(xhr, err) { 129 | console.log(' - - - - - - - - xhr:') 130 | console.log(xhr); 131 | console.log(' - - - - - - - - error:') 132 | console.log(err); 133 | } 134 | }); 135 | } 136 | getNotes(); // initialise the notes on the page 137 | 138 | // Ajax without JQuery if you prefer: 139 | function postNotes () { 140 | var xhr = new XMLHttpRequest(); 141 | xhr.open('POST', baseURL + '/SaveNotes'); 142 | xhr.onreadystatechange = function() { 143 | // un-comment these console.logs in for debugging 144 | console.log( xhr.status, xhr.statusText ) 145 | console.log(xhr.responseText); 146 | return; 147 | }; 148 | var encoded = JSON.stringify({"notes":document.getElementById('notes').value }); 149 | xhr.send(encoded); 150 | } 151 | 152 | $( "#send" ).click(function() { 153 | console.log('Save Button Clicked!'); 154 | postNotes(); 155 | }); 156 | }); 157 | -------------------------------------------------------------------------------- /index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Chat 6 | 7 | 8 | 9 | 10 |

    You joined the chat!

    11 | 12 | 13 | 14 |
    16 | 17 | 18 | 19 | 20 |
    21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 36 | 37 | 38 | 39 | -------------------------------------------------------------------------------- /index.js: -------------------------------------------------------------------------------- 1 | var get = require('./lib/get'); 2 | var save = require('./lib/save'); 3 | 4 | function handler (event, context) { 5 | console.log('event', JSON.stringify(event)); 6 | console.log(' - - - - - - - - - - - - - - - - - - - - - - - - '); 7 | console.log('context', JSON.stringify(context)); 8 | console.log(' - - - - - - - - - - - - - - - - - - - - - - - - '); 9 | 10 | if(!event || !event.m) { // GET 11 | get(function(err, data) { 12 | context.succeed(data); 13 | }); 14 | } 15 | else { // SAVE 16 | save(event, function(err, data) { 17 | // if (err) { 18 | // console.log("Error uploading data: ", err); 19 | // } else { 20 | console.log("Successfully uploaded data to ", data.Location); 21 | return context.succeed(data.Location); 22 | // } 23 | }); 24 | } 25 | 26 | } 27 | 28 | exports.handler = handler; 29 | -------------------------------------------------------------------------------- /iot.js: -------------------------------------------------------------------------------- 1 | var data = { 2 | messages: [] 3 | }; 4 | 5 | new Vue({ 6 | el: '#chat', 7 | data: data 8 | }); 9 | 10 | document.getElementById('send').addEventListener('click', function (e) { 11 | var say = document.getElementById('say') 12 | send(say.value); 13 | say.value = ''; 14 | }); 15 | 16 | function SigV4Utils(){} 17 | 18 | SigV4Utils.sign = function(key, msg) { 19 | var hash = CryptoJS.HmacSHA256(msg, key); 20 | return hash.toString(CryptoJS.enc.Hex); 21 | }; 22 | 23 | SigV4Utils.sha256 = function(msg) { 24 | var hash = CryptoJS.SHA256(msg); 25 | return hash.toString(CryptoJS.enc.Hex); 26 | }; 27 | 28 | SigV4Utils.getSignatureKey = function(key, dateStamp, regionName, serviceName) { 29 | var kDate = CryptoJS.HmacSHA256(dateStamp, 'AWS4' + key); 30 | var kRegion = CryptoJS.HmacSHA256(regionName, kDate); 31 | var kService = CryptoJS.HmacSHA256(serviceName, kRegion); 32 | var kSigning = CryptoJS.HmacSHA256('aws4_request', kService); 33 | return kSigning; 34 | }; 35 | 36 | function createEndpoint(regionName, awsIotEndpoint, accessKey, secretKey) { 37 | var time = moment.utc(); 38 | var dateStamp = time.format('YYYYMMDD'); 39 | var amzdate = dateStamp + 'T' + time.format('HHmmss') + 'Z'; 40 | var service = 'iotdevicegateway'; 41 | var region = regionName; 42 | var secretKey = secretKey; 43 | var accessKey = accessKey; 44 | var algorithm = 'AWS4-HMAC-SHA256'; 45 | var method = 'GET'; 46 | var canonicalUri = '/mqtt'; 47 | var host = awsIotEndpoint; 48 | 49 | var credentialScope = dateStamp + '/' + region + '/' + service + '/' + 'aws4_request'; 50 | var canonicalQuerystring = 'X-Amz-Algorithm=AWS4-HMAC-SHA256'; 51 | canonicalQuerystring += '&X-Amz-Credential=' + encodeURIComponent(accessKey + '/' + credentialScope); 52 | canonicalQuerystring += '&X-Amz-Date=' + amzdate; 53 | canonicalQuerystring += '&X-Amz-SignedHeaders=host'; 54 | 55 | var canonicalHeaders = 'host:' + host + '\n'; 56 | var payloadHash = SigV4Utils.sha256(''); 57 | var canonicalRequest = method + '\n' + canonicalUri + '\n' + canonicalQuerystring + '\n' + canonicalHeaders + '\nhost\n' + payloadHash; 58 | 59 | var stringToSign = algorithm + '\n' + amzdate + '\n' + credentialScope + '\n' + SigV4Utils.sha256(canonicalRequest); 60 | var signingKey = SigV4Utils.getSignatureKey(secretKey, dateStamp, region, service); 61 | var signature = SigV4Utils.sign(signingKey, stringToSign); 62 | 63 | canonicalQuerystring += '&X-Amz-Signature=' + signature; 64 | return 'wss://' + host + canonicalUri + '?' + canonicalQuerystring; 65 | } 66 | 67 | var endpoint = createEndpoint( 68 | 'eu-west-1', // Your Region 69 | 'a315z3lphjmasx.iot.eu-west-1.amazonaws.com', 70 | 'AKIAJHXKM73ALW5C4DPA', 71 | 'jykh9E8xVTSp9tNnh+WBrBBrm3XMOTapC4j7zTJ4'); 72 | var clientId = Math.random().toString(36).substring(7); 73 | var client = new Paho.MQTT.Client(endpoint, clientId); 74 | var connectOptions = { 75 | useSSL: true, 76 | timeout: 3, 77 | mqttVersion: 4, 78 | onSuccess: subscribe 79 | }; 80 | client.connect(connectOptions); 81 | client.onMessageArrived = onMessage; 82 | client.onConnectionLost = function(e) { console.log(e) }; 83 | 84 | function subscribe() { 85 | client.subscribe("Test/chat"); 86 | console.log("subscribed"); 87 | } 88 | 89 | function send(content) { 90 | var message = new Paho.MQTT.Message(content); 91 | message.destinationName = "Test/chat"; 92 | client.send(message); 93 | console.log("sent"); 94 | } 95 | 96 | function onMessage(message) { 97 | data.messages.push(message.payloadString); 98 | console.log("message received: " + message.payloadString); 99 | } 100 | -------------------------------------------------------------------------------- /lib/api_gateway_form_mapping_template.txt: -------------------------------------------------------------------------------- 1 | ## convert HTML POST data or HTTP GET query string to JSON 2 | ## https://forums.aws.amazon.com/thread.jspa?messageID=673012 3 | 4 | ## get the raw post data from the AWS built-in variable and give it a nicer name 5 | #if ($context.httpMethod == "POST") 6 | #set($rawAPIData = $input.path('$')) 7 | #elseif ($context.httpMethod == "GET") 8 | #set($rawAPIData = $input.params().querystring) 9 | #set($rawAPIData = $rawAPIData.toString()) 10 | #set($rawAPIDataLength = $rawAPIData.length() - 1) 11 | #set($rawAPIData = $rawAPIData.substring(1, $rawAPIDataLength)) 12 | #set($rawAPIData = $rawAPIData.replace(", ", "&")) 13 | #else 14 | #set($rawAPIData = "") 15 | #end 16 | 17 | ## first we get the number of "&" in the string, this tells us if there is more than one key value pair 18 | #set($countAmpersands = $rawAPIData.length() - $rawAPIData.replace("&", "").length()) 19 | 20 | ## if there are no "&" at all then we have only one key value pair. 21 | ## we append an ampersand to the string so that we can tokenise it the same way as multiple kv pairs. 22 | ## the "empty" kv pair to the right of the ampersand will be ignored anyway. 23 | #if ($countAmpersands == 0) 24 | #set($rawPostData = $rawAPIData + "&") 25 | #end 26 | 27 | ## now we tokenise using the ampersand(s) 28 | #set($tokenisedAmpersand = $rawAPIData.split("&")) 29 | 30 | ## we set up a variable to hold the valid key value pairs 31 | #set($tokenisedEquals = []) 32 | 33 | ## now we set up a loop to find the valid key value pairs, which must contain only one "=" 34 | #foreach( $kvPair in $tokenisedAmpersand ) 35 | #set($countEquals = $kvPair.length() - $kvPair.replace("=", "").length()) 36 | #if ($countEquals == 1) 37 | #set($kvTokenised = $kvPair.split("=")) 38 | #if ($kvTokenised[0].length() > 0) 39 | ## we found a valid key value pair. add it to the list. 40 | #set($devNull = $tokenisedEquals.add($kvPair)) 41 | #end 42 | #end 43 | #end 44 | 45 | ## next we set up our loop inside the output structure "{" and "}" 46 | { 47 | "body": { 48 | #foreach( $kvPair in $tokenisedEquals ) 49 | ## finally we output the JSON for this pair and append a comma if this isn't the last pair 50 | #set($kvTokenised = $kvPair.split("=")) 51 | "$util.urlDecode($kvTokenised[0])" : #if($kvTokenised[1].length() > 0)"$util.urlDecode($kvTokenised[1])"#{else}""#end#if( $foreach.hasNext ),#end 52 | #end 53 | }, 54 | ## Now add any other parameters you want to extract 55 | "context" : { 56 | "method" : "$context.httpMethod", 57 | "path" : "$context.resourcePath", 58 | "stage" : "$context.stage", 59 | "source_ip" : "$context.identity.sourceIp", 60 | "user_agent" : "$context.identity.userAgent", 61 | "user_arn" : "$context.identity.userArn", 62 | "request_id" : "$context.requestId", 63 | "resource_id" : "$context.resourceId" 64 | }, 65 | "headers": { 66 | #foreach($param in $input.params().header.keySet()) 67 | "$param": "$util.escapeJavaScript($input.params().header.get($param))" #if($foreach.hasNext),#end 68 | #end 69 | } 70 | } 71 | -------------------------------------------------------------------------------- /lib/get.js: -------------------------------------------------------------------------------- 1 | var AWS = require('aws-sdk'); 2 | AWS.config.region = 'eu-west-1'; 3 | var bucket = 'dwyl'; 4 | var s3 = new AWS.S3(); 5 | var s3bucket = new AWS.S3({params: {Bucket: bucket}}); 6 | 7 | var allKeys = []; 8 | 9 | var PARAMS = { 10 | Bucket: bucket, 11 | Delimiter: '', 12 | EncodingType: 'url', 13 | Marker: '0', 14 | Prefix: 'chat/' 15 | } 16 | 17 | function listAllKeys(params, cb) { 18 | // console.log(params); 19 | s3.listObjects(params, function(err, data){ 20 | // console.log(err, data.Marker, data.IsTruncated); 21 | // if(!err && data) { 22 | data.Contents.forEach(function(i){ 23 | allKeys.push(i) 24 | }) 25 | // } 26 | // un-comment this when there are more than 1000 messages in the bank! 27 | // if(data.IsTruncated) { 28 | // var nextParams = JSON.parse(JSON.stringify(params)); // clone params 29 | // nextParams.Marker = allKeys[allKeys.length -1].Key.replace('%3A',':'); // recycle params 30 | // return listAllKeys(nextParams, cb); 31 | // } 32 | // else { 33 | var sorted = allKeys 34 | .filter((e) => {return e.Key.match(/\.json/)}) 35 | .sort((a, b) => { return new Date(a.LastModified).getTime() < new Date(b.LastModified).getTime(); }); 36 | cb(null, sorted); 37 | // } 38 | }); 39 | } 40 | 41 | function get_messages (keys, callback) { 42 | var messages = []; 43 | var count = 0; 44 | keys.forEach((k) => { 45 | s3.getObject({Bucket: bucket, Key: k.Key}, function (err, data){ 46 | // console.log(err,data); 47 | // attempt to parse the data as JSON 48 | try { 49 | var json = JSON.parse(data.Body.toString()); 50 | messages.push({ 51 | m: json.m, 52 | n: json.n, 53 | t: json.t 54 | }); 55 | // console.log(messages[messages.length - 1]); 56 | } catch (e) {} // do nothing if it fails. 57 | if(++count === keys.length) { 58 | var sorted = messages.sort((a,b) => { 59 | return new Date(a.t).getTime() > new Date(b.t).getTime(); 60 | }); 61 | callback(null, sorted); 62 | } 63 | }); 64 | }); 65 | } 66 | 67 | module.exports = function get_all_messages_in_order (callback) { 68 | allKeys = []; // reset the array! ... TODO: don't use GLOBAL! 69 | listAllKeys(PARAMS, function(err, sorted){ 70 | get_messages(sorted, callback); 71 | }); 72 | }; 73 | -------------------------------------------------------------------------------- /lib/save.js: -------------------------------------------------------------------------------- 1 | var AWS = require('aws-sdk'); 2 | AWS.config.region = 'eu-west-1'; 3 | var bucket = 'dwyl'; 4 | var s3bucket = new AWS.S3({params: {Bucket: bucket}}); 5 | 6 | module.exports = function save_message (event, callback) { 7 | if(event && event.t) { 8 | var params = { 9 | Key: 'chat/' + event.t + '.json', 10 | Body: JSON.stringify(event), 11 | ContentType: 'application/json', 12 | ACL: 'public-read' 13 | }; 14 | 15 | s3bucket.upload(params, function(err, data) { 16 | return callback(err, data); 17 | }); 18 | } else { 19 | return callback('please provide valid message'); 20 | } 21 | 22 | } 23 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "achat", 3 | "version": "1.0.0", 4 | "description": "Chat that scales predictably.", 5 | "main": "index.js", 6 | "files_to_deploy": [ 7 | "package.json", 8 | "index.js", 9 | "lib/" 10 | ], 11 | "scripts": { 12 | "fast": "tape ./test/*.js", 13 | "test": "istanbul cover ./node_modules/tape/bin/tape ./test/*.js", 14 | "deploy": "node ./node_modules/dpl/dpl.js" 15 | }, 16 | "repository": { 17 | "type": "git", 18 | "url": "git+https://github.com/dwyl/chat.git" 19 | }, 20 | "keywords": [ 21 | "Chat", 22 | "AWS", 23 | "Serverless", 24 | "Demo", 25 | "Example" 26 | ], 27 | "author": "dwyl", 28 | "license": "GPL-2.0", 29 | "bugs": { 30 | "url": "https://github.com/dwyl/chat/issues" 31 | }, 32 | "homepage": "https://github.com/dwyl/chat#readme", 33 | "devDependencies": { 34 | "aws-sdk": "^2.3.3", 35 | "dpl": "^2.1.0", 36 | "istanbul": "^0.4.3", 37 | "tape": "^4.5.1" 38 | } 39 | } 40 | -------------------------------------------------------------------------------- /style.css: -------------------------------------------------------------------------------- 1 | /*============================== 2 | GENERAL STYLES 3 | ================================*/ 4 | 5 | /*https://css-tricks.com/inheriting-box-sizing-probably-slightly-better-best-practice/*/ 6 | *, html { 7 | box-sizing: border-box; 8 | margin:0; 9 | padding:0; 10 | } 11 | 12 | *:before, *:after { 13 | box-sizing: inherit; 14 | } 15 | 16 | body { 17 | font: 1.5em Helvetica, Arial; 18 | height: 100%; 19 | padding-bottom: 2.3em; 20 | overflow:auto; 21 | } 22 | 23 | 24 | 25 | /*============================== 26 | #MESSAGE-INPUT-FORM 27 | ================================*/ 28 | form { 29 | background: #2c3e50; 30 | height: 2.3em; 31 | width: 100%; 32 | padding: 3px; 33 | position: fixed; 34 | bottom: 0; 35 | margin: 0; 36 | } 37 | 38 | form input { 39 | border: 0; 40 | font-size: 1em; 41 | /*height: 2px;*/ 42 | height: 2em; 43 | width: 85%; 44 | padding:0.5em; 45 | margin-right: .5%; 46 | } 47 | 48 | form button { 49 | background: #27ae60; 50 | border: none; 51 | color: white; 52 | font-size: 1em; 53 | height: 2em; 54 | width: 14%; 55 | padding: 10px; 56 | } 57 | 58 | /*============================== 59 | #JOINING-CHAT-STRAPLINE 60 | ================================*/ 61 | 62 | #joiners { 63 | background-color:#2c3e50; 64 | color: white; 65 | height: 2em; 66 | opacity:0.9; 67 | padding: 0.5em 0 1em 2em; 68 | z-index: 3; 69 | } 70 | 71 | #joined { color: #40d47e; } 72 | 73 | 74 | 75 | /*============================== 76 | #MESSAGES-WINDOW 77 | ================================*/ 78 | #messages { 79 | list-style-type: none; 80 | margin: 0; 81 | max-height: 90%; 82 | padding: 0; 83 | } 84 | 85 | #messages li { padding: 5px 10px; } 86 | 87 | #messages li:nth-child(odd) { background: #eee; } 88 | 89 | 90 | /* == Individual messages == */ 91 | .time { color: #2c3e50; } 92 | 93 | .name { color: #2980b9; } 94 | -------------------------------------------------------------------------------- /test/get.test.js: -------------------------------------------------------------------------------- 1 | var test = require('tape'); 2 | var get = require('../lib/get'); 3 | 4 | var EVENT = { 5 | body: { 6 | m: 'Tests...', 7 | t: Date.now(), 8 | n: 'bot' 9 | } 10 | }; 11 | 12 | test('invoke the save_message', function (t) { 13 | get(function(err, data){ 14 | // console.log(err, data); 15 | t.ok(data.length > 1); 16 | t.end(); 17 | }); 18 | }); 19 | -------------------------------------------------------------------------------- /test/index.test.js: -------------------------------------------------------------------------------- 1 | var test = require('tape'); 2 | var handler = require('../index').handler; 3 | 4 | var CONTEXT = { 5 | functionName: 'LambdaTest', 6 | functionVersion: '1', 7 | invokedFunctionArn: 'arn:aws:lambda:eu-west-1:123456:function:LambdaTest:$LATEST', 8 | fail: function (err) { 9 | console.log('FAIL:', err); 10 | } 11 | }; 12 | 13 | var EVENT = { 14 | m: 'How you doin?! @ '+ new Date().toUTCString(), 15 | t: Date.now(), 16 | n: 'joey' 17 | }; 18 | 19 | test('invoke the save_message', function (t) { 20 | CONTEXT.succeed = function () { 21 | console.log(' - - - - - - - - - - - - - - - - - - - - - - - - '); 22 | console.log(arguments); // the argument to context.succeed 23 | t.ok(arguments[0], 'Res:' + JSON.stringify(arguments[0])); 24 | t.end(); 25 | }; 26 | handler(EVENT, CONTEXT); 27 | }); 28 | 29 | 30 | test('invoke the lambda without an event.body (get messages)', function (t) { 31 | CONTEXT.succeed = function () { 32 | // console.log(' - - - - - - - - - - - - - - - - - - - - - - - - '); 33 | // console.log(arguments); // the argument to context.succeed 34 | t.ok(arguments[0].length > 1, 'Message Count:' + arguments[0].length); 35 | t.end(); 36 | }; 37 | handler({}, CONTEXT); 38 | }); 39 | -------------------------------------------------------------------------------- /test/save.test.js: -------------------------------------------------------------------------------- 1 | var test = require('tape'); 2 | var save = require('../lib/save'); 3 | 4 | var EVENT = { 5 | m: 'Herro Wold!', 6 | t: Date.now(), 7 | n: 'bot' 8 | }; 9 | 10 | test('invoke the save_message without a valid event', function (t) { 11 | save({}, function(err, data){ 12 | console.log(err, data); 13 | t.ok(err); 14 | t.end(); 15 | }); 16 | }); 17 | 18 | test('invoke the save_message', function (t) { 19 | save(EVENT, function(err, data){ 20 | console.log(err, data); 21 | t.equal(data.Key, 'chat/' + EVENT.t + '.json'); 22 | t.end(); 23 | }); 24 | }); 25 | --------------------------------------------------------------------------------