https://github.com/you54f/pact-plugin-template-dart
Pact 🔗 Plugin 🔌 template for the Dart 🎯 language = 🫶
https://github.com/you54f/pact-plugin-template-dart
contract-testing dart grpc grpc-server pact pact-plugin quick-start template
Last synced: 22 days ago
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Pact 🔗 Plugin 🔌 template for the Dart 🎯 language = 🫶
- Host: GitHub
- URL: https://github.com/you54f/pact-plugin-template-dart
- Owner: YOU54F
- Created: 2022-12-12T13:35:35.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2023-05-17T21:24:07.000Z (about 2 years ago)
- Last Synced: 2025-02-17T04:22:30.206Z (4 months ago)
- Topics: contract-testing, dart, grpc, grpc-server, pact, pact-plugin, quick-start, template
- Language: Dart
- Homepage:
- Size: 2.27 MB
- Stars: 1
- Watchers: 0
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
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README
# Pact Plugin Template
Template project to help bootstrap a new Pact [Plugin](https://github.com/pact-foundation/pact-plugins) for the [Pact](http://docs.pact.io) framework.
**Features:**
* Stubbed gRPC methods ready to implement
* Automated release procedure
* Support for recommended common platform/targets
* Levelled logging for observability
**TODO**
- [ ] Support Matchers and Generators (requires FFI package support)
## Repository Structure
```
├── README.md # This file!
├── Makefile # Build configuration (✅ fill me in!)
├── bin/plugin.dart # The gRPC server implementation (✅ fill me in!)
├── pact-plugin.json # Plugin configuration file - set to use the binary distributable
├── pact-plugin-dev.json # Plugin configuration file for development - set to use the gRPC server `.dart` file
├── plugin.log # The plugins log file
├── proto # Location of protobuf and gRPC definitions for Plugin Framework
├── build # This is where your binary distributions will be output
├── pubspec.yaml # The project dependencies file
├── pubspec.lock # The project dependencies lockfile
├── analysis_options.yaml # The project dependencies lockfile
├── CHANGELOG.md # This is where your binary distributions will be output
└── test # This is where your binary distributions will be output
└── .github/workflows # This holds your CI build and release configuration
├── RELEASING.md # Instructions on how to release 🚀
```
## Developing the plugin
### Prerequsites
The protoc compiler must be installed for this plugin
See Dart specific instructions [here](https://github.com/google/protobuf.dart/tree/master/protoc_plugin#how-to-build)
### Create your new repository
1. Clone this repository
2. Create a new repository in GitHub. The name of the plugin should be `pact--plugin` e.g. `pact-protobuf-plugin`
3. Push this code to your new repository
### Install the project dependencies
Run:
```
dart pub global activate protoc_plugin
dart pub get
```
To ensure the dependencies and vendoring are correct.
### Set the name and version
In the top of the [`Makefile`](./Makefile) set `PROJECT` to your plugin's name.
`PROJECT` should map to `` in your GitHub repository.
*NOTE: It's important that the name of your GitHub project and the `PROJECT` variable must align, to create artifacts discoverable to the CLI tooling, such as the [Plugin CLI](https://docs.pact.io/implementation_guides/pact_plugins/cli).*
### Design the consumer interface
This is how the users of your plugin will write the plugin specific interaction details.
For example, take the following HTTP interaction:
```js
await pact
.addInteraction()
.given('the Matt protocol exists')
.uponReceiving('an HTTP request to /matt')
.usingPlugin({
plugin: 'matt',
version: '0.0.4',
})
.withRequest('POST', '/matt', (builder) => {
builder.pluginContents('application/matt', mattRequest); // <- request
})
.willRespondWith(200, (builder) => {
builder.pluginContents('application/matt', mattResponse); // <- response
})
.executeTest((mockserver) => {
...
```
The user needs to specify the request and response body portion of the request.
Because the use cases for plugins are so wide and varied, the framework does not impose limits
on this data structure and is something you need to design.
This being said, most plugins have opted to use a JSON structure.
This structure is represented in our GoLang template in [`configuration.go`](https://github.com/pact-foundation/pact-plugin-template-golang/blob/main/configuration.go)
Think about how you would like your user to specify the interaction details for the various interaction types.
Here is an example for a TCP plugin with a custom text protocol:
#### Synchronous Messages
Set the expected response from the API:
```go
mattMessage := `{"response": {"body": "hellotcp"}}`
```
#### Asynchronous Messages
Set the request/response all in one go:
```go
mattMessage := `{"request": {"body": "hellotcp"}, "response":{"body":"tcpworld"}}`
```
#### HTTP
Separate out the body on the request/response part of the interaction:
```go
mattRequest := `{"request": {"body": "hello"}}`
mattResponse := `{"response":{"body":"world"}}`
```
### Write the Plugin!
#### Implement the relevant RPC functions
Open [`plugin.dart`](./plugin.dart) and update the relevant RPC functions.
Depending on your use case, some of the RPC calls won't be required, each method is well signposted to help you along.
#### Logging
You should log regularly. Debugging gRPC calls from the framework can be challenging, as the plugin is started asynchronously by the Plugin Driver behind the scenes.
There are two ways to log:
1. Stdout - all stdout (e.g. `print`) is pulled into the general Pact logs for the framework you're running
2. To file. All calls to `log` will be written to a file
The log setup has three main features:
1. [X] It works with the native `dart:io` package
2. [X] It logs to a file relative to plugin execution in `log/plugin.log`
3. [ ] It is levelled, at the direction of the plugin driver (that is, the log level will pass in from the driver which will restrict the levels logged in this plugin)
To write something to the log file, you simply call the `log` method
`log(message)`
### Publish your plugin
Follow the steps in [Releasing](./RELEASING.md) to publish a new version of your Plugin.
## Local Development
The following command will build the plugin, and install into the correct plugin directory for local development:
```
make install_local
```
You can then reference your plugin in local tests to try it out.
### Regenerating the plugin protobuf definitions
If a new protobuf definition is required (e.g. to support a new feature), copy it into the `proto` folder and run the following Make task:
```
make proto
```
It will update the definitions in the `./proto/plugin.*.dart` packages. Note this may result in a breaking change, depending on the version. So upgrade carefully and ensure you have appropriate tests
## Supported targets
This code base should automatically create artifacts for the following OS/Architecture combiations:
| OS | Architecture | Supported |
| ------- | ------------ | --------- |
| OSX | x86_64 | ✅ |
| OSX | arm | ✅ |
| Linux | x86_64 | ✅ |
| Linux | arm | ✅ |
| Windows | x86_64 | ✅ |
| Windows | arm | ✅ |