◎ ◎ 16 | ◡ 17 | 18 | │(1) 19 | │ ┏━━━━━━━━━━━━━━━━━━┓ 20 | │ ┃ ┃ 21 | │ (2) ┃ Google OAuth2 ┃ (4) 22 | │ ┌─────────────▶┃ API ┃◀────────────┐ 23 | │ │ ┃ ┃ │ 24 | │ │ ┗━━━━━━━━━━━━━━━━━━┛ │ 25 | ▼ ▼ ┏━━━━━━━━━━━━━━━━━━┓ 26 | ┏━━━━━━━━━━━━━━━━━━┓ ┃ ┃ 27 | ┃ ┃ (3) ┃ AWS STS ┃ 28 | ┌─▶┃ Website ┃◀──────────────────────────▶┃ AWS Web ID Fed ┃ 29 | │ ┃ ┃ ┃ ┃ 30 | │ ┗━━━━━━━━━━━━━━━━━━┛ ┗━━━━━━━━━━━━━━━━━━┛ 31 | │ │ 32 | │ │ ┏━━━━━━━━━━━━━━━━━━┓ 33 | │ │ ┃ ┃ 34 | │ └───────▶┃ SNS Topic ┃ 35 | │ (5) ┃ ┃ 36 | │ ┗━━━━━━━━━━━━━━━━━━┛ 37 | │ │ 38 | │ │ ┏━━━━━━━━━━━━━━━━━━┓ 39 | │ │ ┃ ┃ 40 | │ └──────▶┃ Lambda fn1 ┃ 41 | │ (6) ┃ ┃ 42 | │ ┗━━━━━━━━━━━━━━━━━━┛ 43 | │ │ 44 | │ │ ┏━━━━━━━━━━━━━━━━━━┓ 45 | │ │ ┃ ┃ 46 | │ └─────▶┃ DynamoDB Table ┃ 47 | │ (7) ┃ ┃ 48 | │ ┗━━━━━━━━━━━━━━━━━━┛ 49 | │ │ 50 | │ ┏━━━━━━━━━━━━━━━━━━┓ │ 51 | │ ┃ ┃ │ 52 | │ ┃ Lambda fn2 ┃◀─────────┘ 53 | │ ┃ ┃ (8) 54 | │ ┗━━━━━━━━━━━━━━━━━━┛ 55 | │ │ 56 | │ ┏━━━━━━━━━━━━━━━━━━┓ │ 57 | │ ┃ ┃ │ 58 | └────────────┃ S3 Object ┃◀─────────────┘ 59 | (10) ┃ ┃ (9) 60 | ┗━━━━━━━━━━━━━━━━━━┛ 61 | 62 | 63 | Created with Monodraw 64 |65 | 66 | 1. The user opens their browser and go to the website which is hosted entirely on S3 67 | 2. The user signs in with their Google account and gets back an `id_token` 68 | 3. Using AWS Web Identity Federation in the Javascript SDK, the `id_token` is sent to get temporary AWS credentials from STS. 69 | 4. STS verifies the token with Google 70 | 5. The users types in a message, hits ENTER, and the website publishes the message to an SNS Topic. 71 | 6. A Lambda function is trigged by the SNS message, which gets the contents of the message, and... 72 | 7. Stores the message in a DynamoDB table 73 | 8. The process of adding a new chat message to the DynamoDB table triggers another Lambda function. This requires the currently-in-preview DynamoDB Streams feature. This second Lambda function reads the last 20 messages from DynamoDB, and... 74 | 9. Writes them to an S3 object in JSON format 75 | 10. The website polls the S3 object every second, and updates the chat box with any new messages it finds. 76 | 77 | 78 | ## Getting Started 79 | 80 | There is a lot involved here, but we have tried to make it as easy as possible for you to follow along. 81 | 82 | ### Get the code 83 | 84 | git clone git@github.com:cloudnative/lambda-chat.git 85 | cd lambda-chat 86 | 87 | ### Config 88 | 89 | cp config.example.yml config.yml 90 | 91 | The only thing to edit at this point is the name of the S3 bucket to put the website in as bucket names are globally unique. 92 | 93 | s3_bucket: my-lambda-chat-bucket 94 | 95 | ### Google OAuth 96 | 97 | To be able to use AWS Web Identity Federation, you will need to create a new Google Project and create credentials. 98 | 99 | 1. Go to: https://console.developers.google.com/project 100 | 1. Create a new project 101 | 1. Enable **Google+ API** 102 | 1. Create OAuth 2 credentials. Leave the Javascript Origin empty for now 103 | 1. Edit `config.yml` and set `google_oauth_client_id` to your Client ID 104 | 105 | ### AWS Resources 106 | 107 | #### Prerequisites 108 | 109 | You will need Python 2.7. On OSX using brew 110 | 111 | brew install python 112 | 113 | Now we need a few Python libraries 114 | 115 | pip install -r requirements.txt 116 | 117 | #### CloudFormation 118 | 119 | There is a script called `resources.py` which will generate a CloudFormation template to bring up the AWS resources needed to run Lambda Chat. 120 | 121 | You can see the template by running 122 | 123 | ./resources.py cf 124 | 125 | If you are happy with that, the script can also launch the CloudFormation Stack. To create it in N. Virginia, run: 126 | 127 | ./resources.py launch --region=us-east-1 128 | 129 | The script returns quickly because it is now up to CloudFormation to bring up the AWS resources. Login to the AWS Web Console and go to the CloudFormation section in that region. Select the `Lambda-Chat` stack, then click on the **Events** tab to see the progress and check for errors. 130 | 131 | Once the stack is complete, run: 132 | 133 | ./resources.py output --region=us-east-1 134 | 135 | and add these values to your `config.yml` file. 136 | 137 | #### Website 138 | 139 | The files needed to run the website need to be in S3. To get them there: 140 | 141 | cd s3-website 142 | ./update.sh 143 | 144 | You can run this command as many times as you like, particularly if you are editing the files to see what is happening. 145 | 146 | The script tells you the URL of the website. Open that up in your browser. 147 | 148 | #### Lambda functions 149 | 150 | To help with the AWS Lambda side of things, we are using 151 | [kappa](https://github.com/garnaat/kappa). Kappa is a CLI tool that helps with 152 | the details of creating and managing AWS Lambda applications. You must install 153 | kappa before proceeding. You can install it from PyPI using pip: 154 | 155 | % pip install kappa 156 | 157 | or you can clone the kappa repo and install locally: 158 | 159 | % git clone git@github.com:garnaat/kappa.git 160 | % cd kappa 161 | % pip install -r requirements.txt 162 | % python setup.py install 163 | 164 | Next, you must edit the config.yml files in the lambda/sns directory and the 165 | lambda/dynamodb directories. The config.yml files have comments which direct 166 | you to the parts that need to be changed. 167 | 168 | Now create the components required for the SNS->DynamoDB Lambda function: 169 | 170 | 1. cd lambda/sns 171 | 1. run ``kappa config.yml create`` 172 | 1. run ``kappa config.yml invoke``. This will call the AWS Lambda function 173 | synchronously with test data and return the log data to the console. 174 | 1. run ``kappa config.yml add_event_sources``. This will connect the SNS topic 175 | to your AWS Lambda function. 176 | 177 | Finally, you need to create the components requried for the DynamoDB->S3 Lambda 178 | function: 179 | 180 | 1. cd lambda/dynamodb 181 | 1. run ``kappa config.yml create`` 182 | 1. run ``kappa config.yml invoke``. This will call the AWS Lambda function 183 | synchronously with test data and return the log data to the console. 184 | 1. run ``kappa config.yml add_event_sources``. This will connect the DynamoDB 185 | stream to your AWS Lambda function. 186 | 187 | 188 | ### Usage 189 | 190 | 1. Go to the URL returned by the `update.sh` script, and login with your Google account. 191 | 1. Use like any other chat application :-) 192 | 193 | 194 | ## Updating 195 | 196 | You should feel free to mess around with this and update parts of it with your own code. If you do, please [let us know](https://twitter.com/intent/tweet?text=I%20am%20having%20fun%20with%20Lambda%20Chat.%20Thanks%20@CloudNativeIO). 197 | 198 | When you are making changes to the website, you can push them to S3 by running: 199 | 200 | cd s3-website 201 | ./update.sh 202 | 203 | For modifications to the AWS Lambda functions, run: 204 | 205 | % kappa config.yml update_code 206 | 207 | in the corresponding lambda directory. 208 | 209 | 210 | ## Clean up 211 | 212 | Delete the CloudFormation stack 213 | 214 | ./resources.py delete --region=us-east-1 215 | 216 | Delete the Lambda functions 217 | 218 | % kappa config.yml delete 219 | 220 | in the corresponding lambda directory. This will delete the AWS Lambda 221 | function, remove the event source mappings, and delete the IAM role. 222 | 223 | ## Reading, resources and other stuff 224 | 225 | - [The blog post that describes why we did this](https://cloudnative.io/blog/2015/05/lambda-chat/) 226 | - [AWS Web Identity Federation playground](https://web-identity-federation-playground.s3.amazonaws.com/index.html) 227 | - [Building Dynamic Dashboards Using Lambda and DynamoDB Streams: Part 1](https://medium.com/aws-activate-startup-blog/building-dynamic-dashboards-using-lambda-and-dynamodb-streams-part-1-217e2318ae17) 228 | - [Kappa](https://github.com/garnaat/kappa) 229 | - [Troposphere](https://github.com/cloudtools/troposphere) 230 | 231 | -------------------------------------------------------------------------------- /config.example.yml: -------------------------------------------------------------------------------- 1 | # Example configuration for Lambda Chat 2 | # Copy this file to `config.yml` and then set the values appropriately 3 | 4 | # The Google OAuth Client ID 5 | # Visit: https://console.developers.google.com/project 6 | # To create a project, enable the Google+ API, and create an ID 7 | # Set the Javascript Origin to the S3 bucket URL 8 | google_oauth_client_id: TODO 9 | 10 | # The AWS region to do everything in 11 | region: us-east-1 12 | 13 | # The name of the S3 bucket to use for the website 14 | # This must be unique across all AWS accounts 15 | s3_bucket: lambda-chat 16 | 17 | # The S3 object key for the chat data 18 | data_key: data.json 19 | 20 | # The ARN of the IAM role the website will assume to be able to send messages 21 | # using SNS 22 | website_iam_role_arn: arn:aws:iam::TODO 23 | 24 | # The ARN of the SNS topic to publish chat messages to, and for Lambda to read 25 | sns_topic_arn: arn:aws:sns::TODO 26 | -------------------------------------------------------------------------------- /lambda/dynamodb/LambdaChatDynamoDBPolicy.json: -------------------------------------------------------------------------------- 1 | { 2 | "Version": "2012-10-17", 3 | "Statement": [ 4 | { 5 | "Effect": "Allow", 6 | "Action": [ 7 | "lambda:InvokeFunction" 8 | ], 9 | "Resource": "*" 10 | }, 11 | { 12 | "Effect": "Allow", 13 | "Action": [ 14 | "dynamodb:*", 15 | "s3:*", 16 | "logs:*" 17 | ], 18 | "Resource": "*" 19 | } 20 | ] 21 | } 22 | -------------------------------------------------------------------------------- /lambda/dynamodb/code/LambdaChatDynamoDB.js: -------------------------------------------------------------------------------- 1 | console.log('Loading function'); 2 | var async = require('async'); 3 | var aws = require('aws-sdk'); 4 | var ddb = new aws.DynamoDB( 5 | {endpoint: "https://dynamodb.us-west-2.amazonaws.com/", 6 | params: {TableName: "lambdachat"}}); 7 | var s3 = new aws.S3(); 8 | // change bucket name to match your bucket name 9 | var bucket = "lambda-chat"; 10 | var keyname = "data.json"; 11 | 12 | 13 | function escapeHtml(text) { 14 | var map = { 15 | '&': '&', 16 | '<': '<', 17 | '>': '>', 18 | '"': '"', 19 | "'": ''' 20 | }; 21 | 22 | return text.replace(/[&<>"']/g, function(m) { return map[m]; }); 23 | } 24 | 25 | 26 | exports.handler = function(event, context) { 27 | console.log('Handle DynamoDB Streams event'); 28 | console.log(JSON.stringify(event, null, 2)); 29 | var new_object = event.Records[0].dynamodb; 30 | var channel = "default"; 31 | if ('channel' in new_object.NewImage) { 32 | channel = new_object.NewImage.channel.S; 33 | } 34 | console.log("channel = " + channel); 35 | 36 | 37 | async.waterfall([ 38 | function getrecords(next) { 39 | var params = { 40 | "IndexName": "channel-timestamp-index", 41 | "KeyConditions": { 42 | "channel": { 43 | "AttributeValueList": [{ 44 | "S": channel 45 | }], 46 | "ComparisonOperator": "EQ" 47 | } 48 | 49 | }, 50 | "Limit": 20, 51 | "ScanIndexForward": false 52 | } 53 | console.log("Scanning the table"); 54 | ddb.query(params, next); 55 | }, 56 | function buildjson(response, next) { 57 | console.log("Building JSON file"); 58 | console.log(JSON.stringify(response)); 59 | var messageData = { 60 | messages: [] 61 | }; 62 | 63 | for (var i = response.Items.length - 1; i >= 0; i--) { 64 | ii = response.Items[i]; 65 | var message = {}; 66 | message['id'] = ii.message_id['S']; 67 | message['name'] = escapeHtml(ii.name['S']); 68 | message['message'] = escapeHtml(ii.message['S']); 69 | message['channel'] = ii.channel['S']; 70 | messageData.messages.push(message); 71 | } 72 | next(null, JSON.stringify(messageData)); 73 | }, 74 | function savetos3(jsonstring, next) { 75 | console.log(jsonstring); 76 | s3.putObject({ 77 | Bucket: bucket, 78 | Key: keyname, 79 | Body: jsonstring 80 | }, next); 81 | } 82 | ], function (err) { 83 | if (err) { 84 | console.log('got an error'); 85 | console.log(err, err.stack); 86 | } else { 87 | console.log('Saved Data to S3'); 88 | } 89 | context.done(err, ''); 90 | }); 91 | 92 | }; 93 | -------------------------------------------------------------------------------- /lambda/dynamodb/code/README: -------------------------------------------------------------------------------- 1 | This code requires the async nodejs package. Before uploading the function you 2 | should install that package here using: 3 | 4 | % npm install async -------------------------------------------------------------------------------- /lambda/dynamodb/config.yml: -------------------------------------------------------------------------------- 1 | --- 2 | # change profile and region to meet your needs 3 | profile: cloudnative-dev 4 | region: us-west-2 5 | resources: resources.json 6 | iam: 7 | policy: 8 | description: A policy used with the Kappa SNS->DynamoDB example 9 | name: LambdaChatDynamoDBPolicy 10 | document: LambdaChatDynamoDBPolicy.json 11 | role: 12 | name: LambdaChatDynamoDBRole 13 | lambda: 14 | name: LambdaChatDynamoDB 15 | zipfile_name: LambdaChatDynamoDB.zip 16 | description: A simple chat app with S3/SNS/DynamoDB/Lambda 17 | path: code/ 18 | handler: LambdaChatDynamoDB.handler 19 | runtime: nodejs 20 | memory_size: 128 21 | timeout: 3 22 | event_sources: 23 | - 24 | # Change this to point to your DynamoDB stream. 25 | # Note that you must be in the DynamoDB Streams preview. 26 | arn: arn:aws:dynamodb:us-west-2:860421987956:table/lambdachat/stream/2015-09-09T17:52:45.927 27 | batch_size: 1 28 | starting_position: LATEST 29 | enabled: true 30 | test_data: input.json 31 | -------------------------------------------------------------------------------- /lambda/dynamodb/input.json: -------------------------------------------------------------------------------- 1 | { 2 | "Records":[ 3 | { 4 | "EventName":"INSERT", 5 | "EventVersion":"1.0", 6 | "EventSource":"aws:dynamodb", 7 | "Dynamodb":{ 8 | "NewImage":{ 9 | "Message":{ 10 | "S":"New item!" 11 | }, 12 | "Id":{ 13 | "N":"101" 14 | } 15 | }, 16 | "SizeBytes":26, 17 | "StreamViewType":"NEW_AND_OLD_IMAGES", 18 | "SequenceNumber":"111", 19 | "Keys":{ 20 | "Id":{ 21 | "N":"101" 22 | } 23 | } 24 | }, 25 | "EventID":"1", 26 | "eventSourceARN":"arn:aws:dynamodb:us-east-1:acct-id:table/ExampleTableWithStream/stream/stream-id/", 27 | "AwsRegion":"us-east-1" 28 | }, 29 | { 30 | "EventName":"MODIFY", 31 | "EventVersion":"1.0", 32 | "EventSource":"aws:dynamodb", 33 | "Dynamodb":{ 34 | "NewImage":{ 35 | "Message":{ 36 | "S":"This item has changed" 37 | }, 38 | "Id":{ 39 | "N":"101" 40 | } 41 | }, 42 | "SizeBytes":59, 43 | "StreamViewType":"NEW_AND_OLD_IMAGES", 44 | "SequenceNumber":"222", 45 | "OldImage":{ 46 | "Message":{ 47 | "S":"New item!" 48 | }, 49 | "Id":{ 50 | "N":"101" 51 | } 52 | }, 53 | "Keys":{ 54 | "Id":{ 55 | "N":"101" 56 | } 57 | } 58 | }, 59 | "EventID":"2", 60 | "eventSourceARN":"arn:aws:dynamodb:us-east-1:acct-id:table/ExampleTableWithStream/stream/stream-id/", 61 | "AwsRegion":"us-east-1" 62 | }, 63 | { 64 | "EventName":"REMOVE", 65 | "EventVersion":"1.0", 66 | "EventSource":"aws:dynamodb", 67 | "Dynamodb":{ 68 | "SizeBytes":38, 69 | "StreamViewType":"NEW_AND_OLD_IMAGES", 70 | "SequenceNumber":"333", 71 | "OldImage":{ 72 | "Message":{ 73 | "S":"This item has changed" 74 | }, 75 | "Id":{ 76 | "N":"101" 77 | } 78 | }, 79 | "Keys":{ 80 | "Id":{ 81 | "N":"101" 82 | } 83 | } 84 | }, 85 | "EventID":"3", 86 | "eventSourceARN":"arn:aws:dynamodb:eu-west-1:acct-id:table/ExampleTableWithStream/stream/stream-id/", 87 | "AwsRegion":"eu-west-1" 88 | } 89 | ] 90 | } 91 | -------------------------------------------------------------------------------- /lambda/sns/LambdaChatPolicy.json: -------------------------------------------------------------------------------- 1 | { 2 | "Version": "2012-10-17", 3 | "Statement":[ 4 | { 5 | "Sid":"Stmt1", 6 | "Effect":"Allow", 7 | "Action":["dynamodb:*"], 8 | "Resource":["arn:aws:dynamodb:us-west-2:860421987956:table/lambdachat"] 9 | }, 10 | { 11 | "Sid":"Stmt2", 12 | "Effect":"Allow", 13 | "Action":["logs:*"], 14 | "Resource":["arn:aws:logs:*:*:*"] 15 | } 16 | ] 17 | } 18 | -------------------------------------------------------------------------------- /lambda/sns/config.yml: -------------------------------------------------------------------------------- 1 | --- 2 | # change profile and region to meet your needs 3 | profile: cloudnative-dev 4 | region: us-west-2 5 | iam: 6 | policy: 7 | description: A policy used with the Kappa SNS->DynamoDB example 8 | name: LambdaChatPolicy 9 | document: LambdaChatPolicy.json 10 | role: 11 | name: LambdaChatRole 12 | policy: LambdaChatPolicy 13 | lambda: 14 | name: LambdaChat 15 | zipfile_name: LambdaChat.zip 16 | description: A simple chat app with S3/SNS/DynamoDB/Lambda 17 | path: lambdachat.js 18 | handler: lambdachat.handler 19 | runtime: nodejs 20 | memory_size: 128 21 | timeout: 3 22 | permissions: 23 | - 24 | statement_id: sns_invoke 25 | action: lambda:invokeFunction 26 | principal: sns.amazonaws.com 27 | # change this to point to your SNS topic 28 | source_arn: arn:aws:sns:us-west-2:860421987956:lambda-chat 29 | event_sources: 30 | - 31 | # change this to point to your SNS topic 32 | arn: arn:aws:sns:us-west-2:860421987956:lambda-chat 33 | test_data: input.json 34 | -------------------------------------------------------------------------------- /lambda/sns/dynamodb_table.json: -------------------------------------------------------------------------------- 1 | { 2 | "TableName": "snslambda", 3 | "AttributeDefinitions": [ 4 | { 5 | "AttributeName": "SnsTopicArn", 6 | "AttributeType": "S" 7 | }, 8 | { 9 | "AttributeName": "SnsPublishTime", 10 | "AttributeType": "S" 11 | }, 12 | { 13 | "AttributeName": "SnsMessageId", 14 | "AttributeType": "S" 15 | } 16 | ], 17 | "KeySchema": [ 18 | { 19 | "AttributeName": "SnsTopicArn", 20 | "KeyType": "HASH" 21 | }, 22 | { 23 | "AttributeName": "SnsPublishTime", 24 | "KeyType": "RANGE" 25 | } 26 | ], 27 | "GlobalSecondaryIndexes": [ 28 | { 29 | "IndexName": "MesssageIndex", 30 | "KeySchema": [ 31 | { 32 | "AttributeName": "SnsMessageId", 33 | "KeyType": "HASH" 34 | } 35 | ], 36 | "Projection": { 37 | "ProjectionType": "ALL" 38 | }, 39 | "ProvisionedThroughput": { 40 | "ReadCapacityUnits": 5, 41 | "WriteCapacityUnits": 1 42 | } 43 | } 44 | ], 45 | "ProvisionedThroughput": { 46 | "ReadCapacityUnits": 5, 47 | "WriteCapacityUnits": 5 48 | } 49 | } 50 | -------------------------------------------------------------------------------- /lambda/sns/input.json: -------------------------------------------------------------------------------- 1 | { 2 | "Records":[ 3 | { 4 | "EventSource":"aws:sns", 5 | "EventVersion": "1.0", 6 | "EventSubscriptionArn": "arn:aws:sns:us-east-1:123456789012:lambda_topic:0b6941c3-f04d-4d3e-a66d-b1df00e1e381", 7 | "Sns":{ 8 | "Type" : "Notification", 9 | "MessageId" : "e70fa8dd-0d77-5944-8862-e569494b48b5", 10 | "TopicArn" : "arn:aws:sns:us-east-1:658794617753:lambda-chat", 11 | "Message" : "{\"name\":\"Mitch Garnaat\",\"message\":\"just testing this out\"}", 12 | "Timestamp" : "2015-04-24T13:15:40.632Z", 13 | "Channel" : "foo", 14 | "SignatureVersion" : "1", 15 | "Signature" : "n0zU4mvKQT5vy6RbDK3BoiWQrFBirbaIGRQOVXE4Vx1XE0SrsXBo4mPm2eDMgjFboP0RJxRCvkFpN07mbnVOIoT2UWKVD2hU1vLdTlEPE4ppSSx17KzhABsOuA8XwijL3hm4cpVHmCmhNXcKekC+fGCryjf9cxr6ODm45PxxE4WLSak85uLzgWhfbAEgPqD2Q/Fa3NwJIyBkZWEdlpJCeaZb4gCzPauvcynRyzWS+e+76WpXMgInCU2y7lhtajDpHrDlZ13UvHOWAQONFRGJXsxFeP370tnzVKfdfMPNbmr4gb3dk+VP0+PsyrIakqp31cO5umUZwSeVZaXLQLewmg==", 16 | "SigningCertURL" : "https://sns.us-east-1.amazonaws.com/SimpleNotificationService-d6d679a1d18e95c2f9ffcf11f4f9e198.pem", 17 | "UnsubscribeURL" : "https://sns.us-east-1.amazonaws.com/?Action=Unsubscribe&SubscriptionArn=arn:aws:sns:us-east-1:658794617753:lambda-chat:f1bde0aa-11eb-4417-a9cf-6a00c6aac0a7" 18 | } 19 | } 20 | ] 21 | } 22 | -------------------------------------------------------------------------------- /lambda/sns/lambdachat.js: -------------------------------------------------------------------------------- 1 | console.log('Loading event'); 2 | var aws = require('aws-sdk'); 3 | var ddb = new aws.DynamoDB( 4 | {endpoint: 'https://dynamodb.us-west-2.amazonaws.com/', 5 | params: {TableName: 'lambdachat'}}); 6 | 7 | exports.handler = function(event, context) { 8 | var message_id = event.Records[0].Sns.MessageId; 9 | var timestamp = event.Records[0].Sns.Timestamp; 10 | var payload = JSON.parse(event.Records[0].Sns.Message); 11 | var channel = 'default'; 12 | if ("channel" in payload) { 13 | channel = payload.channel; 14 | } 15 | var name = payload.name; 16 | var message = payload.message; 17 | var LambdaReceiveTime = new Date().toString(); 18 | var itemParams = {Item: {message_id: {S: message_id}, 19 | timestamp: {S: timestamp}, 20 | channel: {S: channel}, 21 | name: {S: name}, 22 | message: {S: message}}}; 23 | ddb.putItem(itemParams, function(err, data) { 24 | context.done(err,''); 25 | }); 26 | }; 27 | -------------------------------------------------------------------------------- /presentation/example.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 |
I don't know what you were looking for, but it's not here.
15 | 16 |A simple chat application using AWS Lambda, SNS, DynamoDB and hosted on S3.
68 | 69 |Please sign in so we can assign you temporary AWS credentials.
71 | 72 | 75 | 76 |