├── .editorconfig
├── .gitattributes
├── .gitignore
├── LocalDynamoDbStream.sln
├── README.md
├── docker-compose.yml
├── provision.sh
├── src
└── LocalDynamoDbStream
│ ├── Function.cs
│ ├── LocalDynamoDbStream.csproj
│ ├── Readme.md
│ └── aws-lambda-tools-defaults.json
└── test
└── LocalDynamoDbStream.Tests
├── FunctionTest.cs
└── LocalDynamoDbStream.Tests.csproj
/.editorconfig:
--------------------------------------------------------------------------------
1 | root = true
2 |
3 | [*]
4 | indent_style = space
5 | trim_trailing_whitespace = true
6 | insert_final_newline = true
7 |
--------------------------------------------------------------------------------
/.gitattributes:
--------------------------------------------------------------------------------
1 | ###############################################################################
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47 | ###############################################################################
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50 | # Convert binary document formats to text before diffing them. This feature
51 | # is only available from the command line. Turn it on by uncommenting the
52 | # entries below.
53 | ###############################################################################
54 | #*.doc diff=astextplain
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57 | #*.DOCX diff=astextplain
58 | #*.dot diff=astextplain
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60 | #*.pdf diff=astextplain
61 | #*.PDF diff=astextplain
62 | #*.rtf diff=astextplain
63 | #*.RTF diff=astextplain
64 |
65 | provision.sh eol=lf
66 |
--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | ## Ignore Visual Studio temporary files, build results, and
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--------------------------------------------------------------------------------
/LocalDynamoDbStream.sln:
--------------------------------------------------------------------------------
1 |
2 | Microsoft Visual Studio Solution File, Format Version 12.00
3 | # Visual Studio 15
4 | VisualStudioVersion = 15.0.28307.438
5 | MinimumVisualStudioVersion = 10.0.40219.1
6 | Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{B497A76F-896C-45D5-A907-9A0A6E57A17E}"
7 | EndProject
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9 | EndProject
10 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "LocalDynamoDbStream", "src\LocalDynamoDbStream\LocalDynamoDbStream.csproj", "{434ABB66-6BF5-4D16-8A3E-A7B591C19F2A}"
11 | EndProject
12 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "LocalDynamoDbStream.Tests", "test\LocalDynamoDbStream.Tests\LocalDynamoDbStream.Tests.csproj", "{7AC30033-A50E-441E-8B86-E54E1F915346}"
13 | EndProject
14 | Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{B7BB5726-C4EA-4883-8460-8A292628F75F}"
15 | ProjectSection(SolutionItems) = preProject
16 | .editorconfig = .editorconfig
17 | docker-compose.yml = docker-compose.yml
18 | README.md = README.md
19 | EndProjectSection
20 | EndProject
21 | Global
22 | GlobalSection(SolutionConfigurationPlatforms) = preSolution
23 | Debug|Any CPU = Debug|Any CPU
24 | Release|Any CPU = Release|Any CPU
25 | EndGlobalSection
26 | GlobalSection(ProjectConfigurationPlatforms) = postSolution
27 | {434ABB66-6BF5-4D16-8A3E-A7B591C19F2A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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29 | {434ABB66-6BF5-4D16-8A3E-A7B591C19F2A}.Release|Any CPU.ActiveCfg = Release|Any CPU
30 | {434ABB66-6BF5-4D16-8A3E-A7B591C19F2A}.Release|Any CPU.Build.0 = Release|Any CPU
31 | {7AC30033-A50E-441E-8B86-E54E1F915346}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
32 | {7AC30033-A50E-441E-8B86-E54E1F915346}.Debug|Any CPU.Build.0 = Debug|Any CPU
33 | {7AC30033-A50E-441E-8B86-E54E1F915346}.Release|Any CPU.ActiveCfg = Release|Any CPU
34 | {7AC30033-A50E-441E-8B86-E54E1F915346}.Release|Any CPU.Build.0 = Release|Any CPU
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/README.md:
--------------------------------------------------------------------------------
1 | # LocalStack DynamoDB Stream to Lambda
2 |
3 | An example .NET Core Lambda consuming a DynamoDB Stream. Runs in [LocalStack](https://github.com/localstack/localstack) on Docker.
4 |
5 | ## Usage
6 |
7 | Requires .NET Core 2.1, Docker, Docker Compose, the aws cli (or awslocal) and [7Zip](https://www.7-zip.org/download.html) on the path if using Windows.
8 |
9 | ### Build and Zip the Lambda
10 |
11 | #### Linux
12 |
13 | ```sh
14 | dotnet publish src/LocalDynamoDbStream
15 | zip -rj function.zip src/LocalDynamoDbStream/bin/Debug/netcoreapp2.1/publish
16 | ```
17 |
18 | #### Windows
19 |
20 | ```sh
21 | dotnet publish src/LocalDynamoDbStream
22 | 7z a -tzip function.zip ./src/LocalDynamoDbStream/bin/Debug/netcoreapp2.1/publish/*
23 | ```
24 |
25 | ### Create the Local Infrastructure
26 |
27 | Start LocalStack and wait for the provisioning to complete.
28 |
29 | ```sh
30 | docker-compose up
31 | ```
32 |
33 | ### Put an Item into the DynamoDB Table
34 |
35 | ```sh
36 | aws --endpoint-url=http://localhost:4569 dynamodb put-item \
37 | --table-name local-table \
38 | --item Id={S="key1"},Value={S="value1"}
39 | ```
40 |
41 | ### Get the CloudWatch Logs for the Lamda Invocation
42 |
43 | _Note that CloudWatch Logs do not appear to be working from Windows hosts (see [here](https://github.com/localstack/localstack/issues/1211))._
44 |
45 | ```sh
46 | aws --endpoint-url=http://localhost:4586 logs filter-log-events \
47 | --log-group-name /aws/lambda/local-function
48 | ```
49 |
50 | ### Update the Lambda Code
51 |
52 | If you have made changes to the Lambda and want to update the existing version, first use the commands above to re-publish and zip, then replace the function using the following.
53 |
54 | ```sh
55 | aws --endpoint-url=http://localhost:4574 lambda update-function-code \
56 | --function-name local-function \
57 | --zip-file fileb://function.zip
58 | ```
59 |
--------------------------------------------------------------------------------
/docker-compose.yml:
--------------------------------------------------------------------------------
1 | version: "3.2"
2 |
3 | services:
4 | localstack:
5 | image: localstack/localstack
6 | ports:
7 | - "4567-4586:4567-4586"
8 | - "8080:8080"
9 | environment:
10 | - "SERVICES=dynamodb,dynamodbstreams,lambda,cloudwatch,logs"
11 | - "LAMBDA_EXECUTOR=docker-reuse"
12 | - "DOCKER_HOST=unix:///var/run/docker.sock"
13 | volumes:
14 | - "./tmp/localstack:/tmp/localstack"
15 | - "/var/run/docker.sock:/var/run/docker.sock"
16 | - "./provision.sh:/docker-entrypoint-initaws.d/provision.sh"
17 | - "./function.zip:/tmp/function.zip"
18 |
--------------------------------------------------------------------------------
/provision.sh:
--------------------------------------------------------------------------------
1 | #!/bin/sh
2 |
3 | set -e
4 |
5 | export AWS_ACCESS_KEY_ID=accesskeyid
6 | export AWS_SECRET_ACCESS_KEY=secretaccesskey
7 | export AWS_DEFAULT_REGION=us-east-1
8 |
9 | echo "Creating Lambda function..."
10 |
11 | aws --endpoint-url=http://localhost:4574 lambda create-function \
12 | --function-name local-function \
13 | --runtime dotnetcore2.1 \
14 | --zip-file fileb:///tmp/function.zip \
15 | --handler LocalDynamoDbStream::LocalDynamoDbStream.Function::FunctionHandler \
16 | --role local-role
17 |
18 | echo "Done creating Lambda function"
19 | echo "Creating DynamoDB table..."
20 |
21 | streamArn=$(aws --endpoint-url=http://localhost:4569 dynamodb create-table \
22 | --table-name local-table \
23 | --attribute-definitions AttributeName=Id,AttributeType=S \
24 | --key-schema AttributeName=Id,KeyType=HASH \
25 | --stream-specification StreamEnabled=true,StreamViewType=NEW_AND_OLD_IMAGES \
26 | --provisioned-throughput ReadCapacityUnits=10,WriteCapacityUnits=10 \
27 | --query 'TableDescription.LatestStreamArn' \
28 | --output text)
29 |
30 | echo "Done creating DynamoDB table"
31 | echo "Creating Lambda trigger..."
32 |
33 | aws --endpoint-url=http://localhost:4574 lambda create-event-source-mapping \
34 | --function-name local-function \
35 | --event-source $streamArn \
36 | --batch-size 1 \
37 | --starting-position TRIM_HORIZON
38 |
39 | echo "Done creating Lambda trigger"
40 | echo "Provisioning complete!"
41 |
--------------------------------------------------------------------------------
/src/LocalDynamoDbStream/Function.cs:
--------------------------------------------------------------------------------
1 | using System;
2 | using System.IO;
3 | using System.Threading.Tasks;
4 | using Amazon.DynamoDBv2.Model;
5 | using Amazon.Lambda.Core;
6 | using Amazon.Lambda.DynamoDBEvents;
7 | using Newtonsoft.Json;
8 |
9 | [assembly: LambdaSerializer(typeof(Amazon.Lambda.Serialization.Json.JsonSerializer))]
10 |
11 | namespace LocalDynamoDbStream
12 | {
13 | public class Function
14 | {
15 | private static readonly JsonSerializer JsonSerializer = new JsonSerializer();
16 |
17 | public Task FunctionHandler(DynamoDBEvent dynamoEvent, ILambdaContext context)
18 | {
19 | context.Logger.LogLine($"Beginning to process {dynamoEvent.Records.Count} records...");
20 |
21 | foreach (var record in dynamoEvent.Records)
22 | {
23 | context.Logger.LogLine($"Event ID: {record.EventID}");
24 | context.Logger.LogLine($"Event Name: {record.EventName}");
25 |
26 | var streamRecordJson = SerializeStreamRecord(record.Dynamodb);
27 | context.Logger.LogLine("DynamoDB Record:");
28 | context.Logger.LogLine(streamRecordJson);
29 | }
30 |
31 | context.Logger.LogLine("Stream processing complete.");
32 |
33 | return Task.CompletedTask;
34 | }
35 |
36 | private static string SerializeStreamRecord(StreamRecord streamRecord)
37 | {
38 | using (var writer = new StringWriter())
39 | {
40 | JsonSerializer.Serialize(writer, streamRecord);
41 | return writer.ToString();
42 | }
43 | }
44 | }
45 | }
46 |
--------------------------------------------------------------------------------
/src/LocalDynamoDbStream/LocalDynamoDbStream.csproj:
--------------------------------------------------------------------------------
1 |
2 |
3 | netcoreapp2.1
4 | true
5 | Lambda
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
--------------------------------------------------------------------------------
/src/LocalDynamoDbStream/Readme.md:
--------------------------------------------------------------------------------
1 | # AWS Lambda Simple DynamoDB Function Project
2 |
3 | This starter project consists of:
4 | * Function.cs - class file containing a class with a single function handler method
5 | * aws-lambda-tools-defaults.json - default argument settings for use with Visual Studio and command line deployment tools for AWS
6 |
7 | You may also have a test project depending on the options selected.
8 |
9 | The generated function handler responds to events on an Amazon DynamoDB stream and serializes the records to a JSON string which are written to the function's execution log. Replace the body of this method, and parameters, to suit your needs.
10 |
11 | After deploying your function you must configure an Amazon DynamoDB stream as an event source to trigger your Lambda function.
12 |
13 | ## Here are some steps to follow from Visual Studio:
14 |
15 | To deploy your function to AWS Lambda, right click the project in Solution Explorer and select *Publish to AWS Lambda*.
16 |
17 | To view your deployed function open its Function View window by double-clicking the function name shown beneath the AWS Lambda node in the AWS Explorer tree.
18 |
19 | To perform testing against your deployed function use the Test Invoke tab in the opened Function View window.
20 |
21 | To configure event sources for your deployed function, for example to have your function invoked when an object is created in an Amazon S3 bucket, use the Event Sources tab in the opened Function View window.
22 |
23 | To update the runtime configuration of your deployed function use the Configuration tab in the opened Function View window.
24 |
25 | To view execution logs of invocations of your function use the Logs tab in the opened Function View window.
26 |
27 | ## Here are some steps to follow to get started from the command line:
28 |
29 | Once you have edited your template and code you can deploy your application using the [Amazon.Lambda.Tools Global Tool](https://github.com/aws/aws-extensions-for-dotnet-cli#aws-lambda-amazonlambdatools) from the command line.
30 |
31 | Install Amazon.Lambda.Tools Global Tools if not already installed.
32 | ```
33 | dotnet tool install -g Amazon.Lambda.Tools
34 | ```
35 |
36 | If already installed check if new version is available.
37 | ```
38 | dotnet tool update -g Amazon.Lambda.Tools
39 | ```
40 |
41 | Execute unit tests
42 | ```
43 | cd "SimpleDynamoDBFunction/test/SimpleDynamoDBFunction.Tests"
44 | dotnet test
45 | ```
46 |
47 | Deploy function to AWS Lambda
48 | ```
49 | cd "SimpleDynamoDBFunction/src/SimpleDynamoDBFunction"
50 | dotnet lambda deploy-function
51 | ```
52 |
--------------------------------------------------------------------------------
/src/LocalDynamoDbStream/aws-lambda-tools-defaults.json:
--------------------------------------------------------------------------------
1 | {
2 | "Information": [
3 | "This file provides default values for the deployment wizard inside Visual Studio and the AWS Lambda commands added to the .NET Core CLI.",
4 | "To learn more about the Lambda commands with the .NET Core CLI execute the following command at the command line in the project root directory.",
5 |
6 | "dotnet lambda help",
7 |
8 | "All the command line options for the Lambda command can be specified in this file."
9 | ],
10 |
11 | "profile":"",
12 | "region" : "",
13 | "configuration": "Release",
14 | "framework": "netcoreapp2.1",
15 | "function-runtime": "dotnetcore2.1",
16 | "function-memory-size": 256,
17 | "function-timeout": 30,
18 | "function-handler": "LocalDynamoDbStream::LocalDynamoDbStream.Function::FunctionHandler"
19 | }
20 |
--------------------------------------------------------------------------------
/test/LocalDynamoDbStream.Tests/FunctionTest.cs:
--------------------------------------------------------------------------------
1 | using System;
2 | using System.Collections.Generic;
3 | using Amazon.DynamoDBv2;
4 | using Amazon.DynamoDBv2.Model;
5 | using Amazon.Lambda.DynamoDBEvents;
6 | using Amazon.Lambda.TestUtilities;
7 | using Xunit;
8 |
9 | namespace LocalDynamoDbStream.Tests
10 | {
11 | public class FunctionTest
12 | {
13 | [Fact]
14 | public void TestFunction()
15 | {
16 | var @event = new DynamoDBEvent
17 | {
18 | Records = new List
19 | {
20 | new DynamoDBEvent.DynamodbStreamRecord
21 | {
22 | AwsRegion = "us-west-2",
23 | Dynamodb = new StreamRecord
24 | {
25 | ApproximateCreationDateTime = DateTime.Now,
26 | Keys = new Dictionary {{"id", new AttributeValue {S = "MyId"}}},
27 | NewImage = new Dictionary
28 | {
29 | {"field1", new AttributeValue {S = "NewValue"}},
30 | {"field2", new AttributeValue {S = "AnotherNewValue"}}
31 | },
32 | OldImage = new Dictionary
33 | {
34 | {"field1", new AttributeValue {S = "OldValue"}},
35 | {"field2", new AttributeValue {S = "AnotherOldValue"}}
36 | },
37 | StreamViewType = StreamViewType.NEW_AND_OLD_IMAGES
38 | }
39 | }
40 | }
41 | };
42 |
43 | var context = new TestLambdaContext();
44 | var function = new Function();
45 |
46 | function.FunctionHandler(@event, context);
47 |
48 | var testLogger = (TestLambdaLogger) context.Logger;
49 | Assert.Contains("Stream processing complete", testLogger.Buffer.ToString());
50 | }
51 | }
52 | }
53 |
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/test/LocalDynamoDbStream.Tests/LocalDynamoDbStream.Tests.csproj:
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3 | netcoreapp2.1
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