# FaasBase
Base library to create FaaS application.
## Installation
The package can be installed by adding `faas_base` to your list of dependencies in `mix.exs`:
```elixir
def deps do
[
{:faas_base, "~> 1.0.1"}
]
end
```
## Basic Usage
### AWS Lambda
1. Add module to your list of application in `mix.exs`:
```elixir
def application do
[
mod: {FaasBase.Aws.Application, []}
]
end
```
2. Create AWS Lambda module. Implement handle(request, event, context) function.
```elixir
defmodule Upcase do
use FaasBase, service: :aws
alias FaasBase.Logger
alias FaasBase.Aws.Request
alias FaasBase.Aws.Response
@impl FaasBase
def init(context) do
# call back one time
{:ok, context}
end
@impl FaasBase
def handle(%Request{body: body} = request, event, context) do
Logger.info(request)
Logger.info(event)
Logger.info(context)
{:ok, Response.to_response(body |> String.upcase, %{}, 200)}
end
end
```
3a. Create zip file for AWS Lambda.
```
$ mkdir -p _build
$ docker run -d -it --rm --name elx erintheblack/elixir-lambda-builder:al2_1.10.4
$ docker cp mix.exs elx:/tmp
$ docker cp lib elx:/tmp
$ docker exec elx /bin/bash -c "mix deps.get; MIX_ENV=prod mix aws.release"
$ docker cp elx:/tmp/_aws ./_build
$ docker stop elx
```
4a. Upload zip file and set configuration.
- Set `Module Name` to `handler`.
- Set Log level to `environment` -> `LOG_LEVEL`
- `debug`, `info`, `warn`, `error`
3b. Create Docker image for AWS Lambda.
```
$ handle_module=Upcase
$ image_name=upcase
$ mkdir -p _build
$ docker run -d -it --rm --name elx erintheblack/elixir-lambda-builder:al2_1.10.4
$ docker cp mix.exs elx:/tmp
$ docker cp lib elx:/tmp
$ docker exec elx /bin/bash -c "mix deps.get; MIX_ENV=prod mix aws.release ${handle_module}"
$ docker cp elx:/tmp/_aws ./_build
$ docker stop elx
$ docker build -t ${image_name}:latest ./_build/_aws/
```
4b. Register Docker image and set configuration.
- Set Log level to `environment` -> `LOG_LEVEL`
- `debug`, `info`, `warn`, `error`
### Azure Functions
1. Add module to your list of application in `mix.exs`:
```elixir
def application do
[
mod: {FaasBase.Azure.Application, []}
]
end
```
2. Create Azure Functions handler module. Implement handle(request, event, context) function.
```elixir
defmodule Upcase do
use FaasBase, service: :azure
alias FaasBase.Logger
alias FaasBase.Azure.Request
alias FaasBase.Azure.Response
@impl FaasBase
def init(_context) do
# call back one time
:ok
end
@impl FaasBase
def handle(%Request{body: body} = request, event, context) do
Logger.info(request)
Logger.info(event)
Logger.info(context)
{:ok, Response.to_response(body |> String.upcase, %{}, 200)}
end
end
```
3. Create files for Azure Functions.
```
$ handle_module=Upcase
$ method_name=upcase
$ mkdir -p _build
$ docker run -d -it --rm --name elx erintheblack/elixir-azure-functions-builder:1.10.4
$ docker cp lib elx:/tmp
$ docker cp mix.exs elx:/tmp
$ docker exec elx /bin/bash -c "mix deps.get; MIX_ENV=prod mix azure.release ${handle_module} ${method_name} 'get post'"
$ docker cp elx:/tmp/_azure ./_build
$ docker stop elx
```
4. Publish.
```
$ cd ./_build/_azure
$ func azure functionapp publish ${functionName} --publish-local-settings --overwrite-settings
```
### IBM Functions
1. Create IBM Functions handler module. Implement handle(request, event, context) function.
```elixir
defmodule Upcase do
use FaasBase, service: :ibm
alias FaasBase.Logger
alias FaasBase.Ibm.Request
alias FaasBase.Ibm.Response
@impl FaasBase
def init(context) do
{:ok, context}
end
@impl FaasBase
def handle(%Request{body: body} = request, event, context) do
Logger.info(request)
Logger.info(event)
Logger.info(context)
{:ok, Response.to_response(body |> String.upcase, %{}, 200)}
end
end
```
2. Create zip file for IBM Functions.
```
$ handle_module=Upcase
$ mkdir -p _build
$ docker run -d -it --rm --name elx erintheblack/elixir-ibm-functions-builder:1.10.4
$ docker cp lib elx:/tmp
$ docker cp mix.exs elx:/tmp
$ docker exec elx /bin/sh -c "mix deps.get; MIX_ENV=prod mix ibm.release ${handle_module}"
$ docker cp elx:/tmp/_ibm ./_build
$ docker stop elx
```
3. Publish.
```
$ cd ./_build/_azure
$ ibmcloud fn action create upcase upcase-0.1.0.zip --native --web true --param LOG_LEVEL info
```
The docs can be found at [https://hexdocs.pm/faas_base](https://hexdocs.pm/faas_base).