terraform-provider-units's Introduction

Units Terraform provider

This provider gives you a possibility to convert categorized units in an interoperable manner. Use data sources as containers for measurement units and converting them. Or, convert them using provider-defined functions.

Problem to solve

Tired of lacking possibility of an easy definition of quantities?
One resource asks for disk size in GiB and other resource outputs it in MB?

Tired of writing code like this?

resource "cloud_provider_disk" "this" {
  size = var.disk_size_gib * 1024 * 1024 * 1024
}

resource "another_cloud_provider_disk" "that" {
  size_gb = ceil((var.disk_size_gib * (1024 * 1024 * 1024)) / (1000 * 1000 * 1000))
}

Solution

Data source

With data sources, you can store converted values in a container, which will be stored in your state.

data "units_data_size" "disk" {
  gibibytes = var.disk_size_gib
}

resource "cloud_provider_disk" "this" {
  size = data.units_data_size.disk.bytes
}

resource "another_cloud_provider_disk" "that" {
  size_gb = ceil(data.units_data_size.disk.gigabytes)
}

Functions

Converter function results are being computed during plan, and won't be stored in the state.

resource "cloud_provider_disk" "this" {
  size = provider::units::from_gib(var.disk_size_gib)
}

resource "another_cloud_provider_disk" "that" {
  size_gb = ceil(provider::units::to_gb(provider::units::from_gib(var.disk_size_gib)))
}

Requirements

Component	Version
Terraform	`>= 1.8.0`
Go	`>= 1.21`

Liability

This provider is not intended to do automatic rounding and outputs conversion results as is. Since results are numbers, they can be both ints and floats.

Do not forget checking computed values and provide additional handling logic.

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