terraform-provider-dataprocessor

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terraform-provider-dataprocessor

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Terraform provider for easy and clean data processing (JQ, YQ, Go plugins...).

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# terraform-provider-dataprocessor

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Avoid ugly terraform logic and code to transform data. This Terraform provider helps you with the data processing in a clean and easy way by using tools like [JQ], [YQ] and Go plugins.

## Processors

### JQ

The famous and well known [JQ] processor for your JSON inputs.

### YQ

The famous and well known [YQ] processor for your YAML inputs.

### Go plugins v1

Check [examples](examples/plugins):

- [FS check](examples/plugins/check_fs/): Checks files exist on disk. Shows how you can access the FS outside the plugin.
- [Complex validation](examples/plugins/complex_validation): Validate Prometheus Rules. Shows how to create advanced logic plugins.
- [Data structure transformation](examples/plugins/data_structure_transformation/): Transforms a data structure into another. Shows how to transform data for easier consumption by different terraform providers.
- [Filtering](examples/plugins/filtering/): Filters a list of usernames based on a regex. Shows how to filter terraform data to avoid HCL complex logic.
- [Remote plugin](examples/plugins/remote_plugin/): Uses a plugin that is hosted in github. Shows how plugins can be shared and create plugin repos.
- [Simple validation](examples/plugins/simple_validation/): Validates the length of a string. Shows that simple validation plugins can be powerful (like small functions), perfect to be used as a remote plugin.

The processor for everything :tada:, is the most powerful of all. You can use _almost_ (e.g `unsafe` package is banned) all the Go standard library. These are the requirements to create a plugin:

- Written in Go.
- No external dependencies, only Go standard library.
- Implemented in a single file (or string block).
- Implement the plugin API (Check the examples to know how to do it).
  - The Filter function should be called:`ProcessorPluginV1`.
  - The Filter function should have this signature: `ProcessorPluginV1(ctx context.Context, inputData string, vars map[string]string) (result string, error error)`.

This is the simplest plugin that you could create, a noop:

```go
package tfplugin

import "context"

func ProcessorPluginV1(ctx context.Context, inputData string, vars map[string]string) (string, error) {
 return inputData, nil
}
```

However you can do complex things like loading JSON, HTTP requests, using timers, complex regex validations, templating...

Go plugins are implemented with [Yaegi], so they are portable and can run anywhere terraform can run.

## Use cases

- Generate, filter, mutate... JSON data.
- Retrieve JSON data from APIs, process and use it on other Terraform providers resources.
- Remove ugly HCL code in favor of a more clean and powerful data processing approach.
- Data validation (including complex cases).

## Requirements

- Terraform `>=1.x`.

## Terraform cloud

The provider its compatible with Terraform cloud workers, its focused on portability and thats why it doesn't require any binary CLI.

## Development

To install your plugin locally you can do `make install`, it will build and install in your `${HOME}/.terraform/plugins/...`

Note: The installation is ready for `OS_ARCH=linux_amd64`, so you make need to change the [`Makefile`](./Makefile) if using other OS.

Example:

```bash
cd ./examples/local
rm -rf ./.terraform ./.terraform.lock.hcl
cd -
make install
cd -
terraform plan
```

[JQ]: https://stedolan.github.io/jq/
[YQ]: https://github.com/mikefarah/yq
[Yaegi]: https://github.com/traefik/yaegi

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