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aws-custom-runtime

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Knative Function Using the AWS Lambda Runtime API

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## Running AWS Lambda Custom Runtime in Knative

In November 2018, AWS announced support for [Lambda custom runtime](https://aws.amazon.com/about-aws/whats-new/2018/11/aws-lambda-now-supports-custom-runtimes-and-layers/) using a straightforward [AWS lambda runtime API](https://docs.aws.amazon.com/lambda/latest/dg/runtimes-api.html).

In this repository you find a function invoker implemented in Go, which provides the AWS Lambda runtime API. You also find a Knative build template. Using this build template you can run AWS Lambda custom runtimes directly in your Kubernetes cluster using [Knative](https://github.com/knative).

The AWS Lambdas execution [environment](https://docs.aws.amazon.com/lambda/latest/dg/current-supported-versions.html) is replicated using the Docker image `amazonlinux` and some environment variables.

### AWS custom runtime walkthrough

This repository contains an `example` lambda function written in bash with a AWS custom runtime described in this AWS [tutorial](https://docs.aws.amazon.com/lambda/latest/dg/runtimes-walkthrough.html). To run this function use our [`tm`](https://github.com/triggermesh/tm) client to talk to the knative API.

1. Install AWS custom runtime:
```
tm deploy task -f https://raw.githubusercontent.com/triggermesh/aws-custom-runtime/main/runtime.yaml
```

2. Deploy function:
```
tm deploy service lambda-bash -f https://github.com/triggermesh/aws-custom-runtime --runtime aws-custom-runtime --build-argument DIRECTORY=example --wait
```

In output you'll see URL that you can use to access `example/function.sh` function

### AWS Lambda RUST example

RUST is also verified to be compatible with this runtime. Though [official readme](https://github.com/awslabs/aws-lambda-rust-runtime) has build instructions, it is more convenient to use docker.

1. Clone repository:
```
git clone https://github.com/awslabs/aws-lambda-rust-runtime
cd aws-lambda-rust-runtime
```

2. Build binary and rename it to `bootstrap`:
```
docker run --rm --user "$(id -u)":"$(id -g)" -v "$PWD":/usr/src/myapp -w /usr/src/myapp rust:1.31.0 cargo build -p lambda_runtime --example basic --release
mv target/release/examples/basic target/release/examples/bootstrap
```

3. Deploy runtime using [`tm`](https://github.com/triggermesh/tm) CLI:
```
tm deploy runtime -f https://raw.githubusercontent.com/triggermesh/aws-custom-runtime/main/runtime.yaml
tm deploy service lambda-rust -f target/release/examples/ --runtime aws-custom-runtime
```

Use your RUST AWS Lambda function on knative:

```
curl lambda-rust.default.k.triggermesh.io --data '{"firstName": "Foo"}'
{"message":"Hello, Foo!"}
```

### AWS Lambda C++ example

1. Build custom runtime:
```
cd /tmp
git clone https://github.com/awslabs/aws-lambda-cpp.git
cd aws-lambda-cpp
mkdir build
cd build
cmake .. -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=OFF -DCMAKE_INSTALL_PREFIX=/tmp/out
make && make install
```

2. Prepare example function:
```
mkdir /tmp/hello-cpp-world
cd /tmp/hello-cpp-world

cat > main.cpp <<EOF
// main.cpp
#include <aws/lambda-runtime/runtime.h>

using namespace aws::lambda_runtime;

invocation_response my_handler(invocation_request const& request)
{
   return invocation_response::success("Hello, World!", "application/json");
}

int main()
{
   run_handler(my_handler);
   return 0;
}
EOF

cat > CMakeLists.txt <<EOF
cmake_minimum_required(VERSION 3.5)
set(CMAKE_CXX_STANDARD 11)
project(bootstrap LANGUAGES CXX)

find_package(aws-lambda-runtime REQUIRED)
add_executable(\${PROJECT_NAME} "main.cpp")
target_link_libraries(\${PROJECT_NAME} PUBLIC AWS::aws-lambda-runtime)
aws_lambda_package_target(\${PROJECT_NAME})
EOF
```

3. Build function:
```
mkdir build
cd build
cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=/tmp/out
make
```

4. Deploy with [`tm`](https://github.com/triggermesh/tm) CLI:
```
tm deploy task -f https://raw.githubusercontent.com/triggermesh/aws-custom-runtime/main/runtime.yaml
tm deploy service lambda-cpp -f . --runtime aws-custom-runtime
```

C++ Lambda function is running on knative platform:
```
curl lambda-cpp.default.k.triggermesh.io --data '{"payload": "foobar"}'
Hello, World!
```

## Events wrapping

Triggermesh AWS custom runtime supports events wrapping for better interoperability of functions and data originated from or targeted at the different platforms. Currently, there are two events wrapper available besides the default "passthrough" one:

- API Gateway wrapper ensures that HTTP requests are digestible by the AWS Lambda functions and decodes their responses to the simple readable format
- CloudEvents wrapper converts function responses into [CloudEvents](https://github.com/cloudevents/spec/blob/v1.0/README.md) event objects.

Events wrapper can be enabled by setting function's environment variables and may have different set of configurable parameters. Let's take a look at CloudEvens example:

1. Generate sample Go function using [tm](https://github.com/triggermesh/tm) CLI
   ```
   tm generate go
   ```

1. Open go/serverless.yaml deployment manifest and add events wrapper env variables:
   ```
   ...
   environment:
      RESPONSE_WRAPPER: CLOUDEVENTS
      CE_TYPE: go-klr-cloudevent
   ...
   ```
1. Deploy function:
   ```
   tm deploy -f go --wait
   ```

After CLI report that deployment is succeeded, send a request to the function endpoint:

```
curl -d '{"Name":"Joe"}' https://go-demo-service-go-function.default.dev.munu.io
```

The result will be encoded into CloudEvents format:

```
Validation: valid
Context Attributes,
  specversion: 1.0
  type: go-klr-cloudevent
  source: go-demo-service-go-function
  subject: klr-response
  id: 7fa17c84-56f0-488a-b7de-e45d7fb3b7b1
  datacontenttype: application/json
Data (binary),
  "Hello Joe!"
```

## Support

We would love your feedback on this tool so don't hesitate to let us know what is wrong and how we could improve it, just file an [issue](https://github.com/triggermesh/aws-custom-runtime/issues/new)

## Code of Conduct

This plugin is by no means part of [CNCF](https://www.cncf.io/) but we abide by its [code of conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md)

aws-custom-runtime

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