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123 lines
3.2 KiB
123 lines
3.2 KiB
# aWsm (awesome)
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**aWsm** is an efficient serverless runtime built with the `silverfish` compiler. It combines WebAssembly sandboxing with asynchronous I/O to provide a lightweight serverless solution suitable for edge computing.
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## Host Dependencies
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- Docker - [Installation Instructions](https://docs.docker.com/install/)
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- libuv
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If on Debian, you can install libuv with the following:
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```bash
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./devenv.sh install_libuv
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```
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## Setting up the environment
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**Note: These steps require Docker. Make sure you've got it installed!**
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We provide a Docker build environment configured with the dependencies and toolchain needed to build the aWsm runtime and serverless functions.
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To setup this environment, run:
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```bash
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./devenv.sh setup
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```
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To enter the docker environment, run:
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```bash
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./devenv.sh run
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```
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## To run applications
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### From within the Docker container environment
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Run the following to copy the awsmrt binary to /awsm/runtime/bin.
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```bash
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cd /awsm/runtime
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make clean all
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```
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There are a set of benchmarking applications in the `/awsm/runtime/tests` directory. Run the following to compile all benchmarks runtime tests using silverfish and then copy all resulting `<application>_wasm.so` files to /awsm/runtime/bin.
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```bash
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cd /awsm/runtime/tests/
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make clean all
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```
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You've now built the binary and some tests. We will now execute these commands from the host
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To exit the container:
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```bash
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exit
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```
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### From the host environment
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You should be in the root project directory (not in the Docker container)
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```bash
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cd runtime/bin/
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```
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We can now run aWsm with one of the serverless functions we built. Let's run Fibonacci!
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Because serverless functions are loaded by aWsm as shared libraries, we want to add the `runtime/tests/` directory to LD_LIBRARY_PATH.
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```bash
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LD_LIBRARY_PATH="$(pwd):$LD_LIBRARY_PATH" ./awsmrt ../tests/test_fibonacci.json
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```
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The JSON file we pass contains a variety of configuration information:
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```json
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{
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"active": "yes",
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"name": "fibonacci",
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"path": "fibonacci_wasm.so",
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"port": 10000,
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"argsize": 1,
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"http-req-headers": [],
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"http-req-content-type": "text/plain",
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"http-req-size": 1024,
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"http-resp-headers": [],
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"http-resp-size": 1024,
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"http-resp-content-type": "text/plain"
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}
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```
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Notice that it is configured to run on port 10000. The `name` field is also used to determine the path where our serverless function is served. In our case, our function is available at `http://localhost:10000/fibonacci`
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Our fibonacci function expects an HTTP POST body of type "text/plain" which it can parse as an integer to figure out which Fibonacci number we want.
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Let's get the 10th. Note that I'm using [HTTPie](https://httpie.org/) to send a POST request with a body containing the parameter I want to pass to my serverless function.
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Note: You possibly run the awsmrt command in the foreground. If so, you should open a new terminal session.
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```bash
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echo "10" | http :10000
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```
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In my case, I received the following in response. The response is 55, which seems to be correct!
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```bash
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HTTP/1.1 200 OK
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Content-length: 3
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Content-type: text/plain
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55
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```
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## Stopping the Runtime
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When you are finished, stop aWsm with
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```bash
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./devenv.sh stop
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```
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