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Sample Terraform Provider

This repository contains a sample code implementation for a Terraform provider. It is meant to be used as a way to teach, educate, and show the internals of a provider. Even if you are not looking to learn how to build custom providers, you may benefit from learning how one works behind the scenes. For more information about how to build custom providers, please visit the HashiCorp Learn platform section about this.

Important: this provider uses OpenSearch as the upstream backend service. Before playing with the provider, you first need to get OpenSearch up-and-running. For simplicity, you can use the docker-compose.yml available in this repository.

Requirements

  • Terraform 0.12+
  • Go 1.19 (to build the provider plugin)
  • Docker 4.11+ (to execute the backend)

Building the Provider

To play with this provider, first you have to build it. Then you must install the native executable generated into your local plugins folder as explained here. The easiest way to do wall of this is running the following command:

make install

Once you have done this, you can start writing your .tf files and run the command terraform init to initialize the plugins of your project.

Using the Provider

The provider allows you to create, read, update, and delete characters from Marvel. Here is an example that you can use to play with the provider:

provider "sample" {
}

resource "sample_marvel_character" "deadpool" {
  fullname = "Deadpool"
  identity = "Wade Wilson"
  knownas = "Merc with a Mouth"
  type = "anti-hero"
}

Debugging the Provider

This provider was created using the Terraform Plugin SDKv2, which allows developers to debug the code using tools like delve. The code and build have been written to allow debugging, so all you have to do is starting a debugging session. You can do this using Visual Studio Code or via command-line.

Visual Studio Code

  1. Create a file named launch.json in the .vscode folder with the following content:
{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Debug Provider",
            "type": "go",
            "request": "launch",
            "mode": "debug",
            "program": "${workspaceFolder}",
            "env": {},
            "args": [
                "-debug",
            ]
        }
    ]
}
  1. Run the editor debugger. This will output the reattach configuration to the debug console.

Command-line

  1. Start a delve debugging session:
dlv exec --accept-multiclient --continue --headless ./terraform-provider-sample -- -debug

This will output the reattach configuration to the output.

Debugging

Before issuing commands like plan, apply, and destroy to your Terraform code, you need to export the TF_REATTACH_PROVIDERS environment variable to reattach the CLI session to the started debugging server. After starting the debugging server session using one method above, the value to this variable will be provided. Here is an example of how to do this.

export TF_REATTACH_PROVIDERS='{"riferrei.com/terraform/sample":{"Protocol":"grpc","Pid":3382870,"Test":true,"Addr":{"Network":"unix","String":"/tmp/plugin713096927"}}}'

License

This project is licensed under the Apache 2.0 License.