Initial commit

.gitignore

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+# Created by https://www.gitignore.io/api/vim,linux,macos,terraform
+# Edit at https://www.gitignore.io/?templates=vim,linux,macos,terraform
+
+### Linux ###
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+### macOS ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### Terraform ###
+# Local .terraform directories
+**/.terraform/*
+
+# .tfstate files
+*.tfstate
+*.tfstate.*
+
+# Crash log files
+crash.log
+
+# .tfvars files
+*.tfvars
+
+# Ignore any .tfvars files that are generated automatically for each Terraform run. Most
+# .tfvars files are managed as part of configuration and so should be included in
+# version control.
+#
+# example.tfvars
+
+# Ignore override files as they are usually used to override resources locally and so
+# are not checked in
+override.tf
+override.tf.json
+*_override.tf
+*_override.tf.json
+
+# Include override files you do wish to add to version control using negated pattern
+# !example_override.tf
+
+# Include tfplan files to ignore the plan output of command: terraform plan -out=tfplan
+# example: *tfplan*
+
+### Vim ###
+# Swap
+[._]*.s[a-v][a-z]
+[._]*.sw[a-p]
+[._]s[a-rt-v][a-z]
+[._]ss[a-gi-z]
+[._]sw[a-p]
+
+# Session
+Session.vim
+Sessionx.vim
+
+# Temporary
+.netrwhist
+
+# Auto-generated tag files
+tags
+
+# Persistent undo
+[._]*.un~
+
+# Coc configuration directory
+.vim
+
+# End of https://www.gitignore.io/api/vim,linux,macos,terraform

.pre-commit-config.yaml

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+repos:
+  - repo: https://github.com/gruntwork-io/pre-commit
+    rev: v0.1.3
+    hooks:
+      - id: terraform-fmt
+      - id: tflint

README.md

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+# Terraform Database URL Generation Module
+
+Are you ever tired of figuring out how to generate a [database URL](https://devcenter.heroku.com/changelog-items/438) or figuring out what the CLI command format is?  This module is for you.
+
+## Usage
+
+```
+module "db1" {
+  source = "./.."
+  database_type = "mysql"
+  username = "foobar"
+  password = "pa55w0rd"
+  hostname = "db-host.example.com"
+  database_name = "db1"
+}
+
+output "db1_url" {
+  value = module.db1.database_url
+}
+
+output "db1_cli" {
+  value = module.db1.cli_command
+}
+```
+
+## Inputs
+
+| Name | Description | Type | Default | Required |
+|------|-------------|------|---------|:-----:|
+| database\_name | Database name | `string` | n/a | yes |
+| database\_type | Database type, e.g. mysql, postgresql, etc | `string` | n/a | yes |
+| hostname | Database hostname | `string` | n/a | yes |
+| password | Database user password | `string` | n/a | yes |
+| port | Database port number | `number` | `null` | yes |
+| username | Database username | `string` | n/a | yes |
+
+## Outputs
+
+| Name | Description |
+|------|-------------|
+| cli\_command | CLI command line for associated database type |
+| database\_url | The database URL |

example/Makefile

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+SHELL = /bin/bash
+tf = time terraform
+
+init:
+	$(tf) $@
+
+plan output:
+	$(tf) $@
+
+apply destroy:
+	$(tf) $@ --auto-approve
+
+create: apply
+
+delete: destroy

example/main.tf

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+module "db1" {
+  source        = "./.."
+  database_type = "mysql"
+  username      = "foobar"
+  password      = "pa55w0rd"
+  hostname      = "db-host.example.com"
+  database_name = "db1"
+}
+
+module "db2" {
+  source        = "./.."
+  database_type = "postgresql"
+  username      = "foobar"
+  password      = "pa55w0rd"
+  hostname      = "db-host.example.com"
+  port          = 5432
+  database_name = "db1"
+}

example/outputs.tf

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+output "db1_url" {
+  value = module.db1.database_url
+}
+
+output "db1_cli" {
+  value = module.db1.cli_command
+}
+
+output "db2_url" {
+  value = module.db2.database_url
+}
+
+output "db2_cli" {
+  value = module.db2.cli_command
+}

main.tf

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+locals {
+  port   = var.port == null ? "" : ":${var.port}"
+  db_url = "${var.database_type}://${var.username}:${var.password}@${var.hostname}${local.port}/${var.database_name}"
+
+  pg_port = var.port == null ? "5432" : var.port
+  pg_cmd  = "PGUSER='${var.username}' PGPASSWORD='${var.password}' PGHOST='${var.hostname}' PGPORT='${local.pg_port}' PGDATABASE='${var.database_name}' psql"
+
+  mysql_port = var.port == null ? "3306" : var.port
+  mysql_cmd  = "MYSQL_PWD='${var.password}' mysql --host='${var.hostname}' --port='${local.mysql_port}' --database='${var.database_name}' --user='${var.username}'"
+}

outputs.tf

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+output "database_url" {
+  value       = local.db_url
+  description = "The database URL"
+}
+
+output "cli_command" {
+  value       = (var.database_type == "mysql") ? local.mysql_cmd : ((var.database_type == "postgresql" ? local.pg_cmd : ""))
+  description = "CLI command line for associated database type"
+}

variables.tf

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+variable "database_type" {
+  type        = string
+  description = "Database type, e.g. mysql, postgresql, etc"
+}
+
+variable "username" {
+  type        = string
+  description = "Database username"
+}
+
+variable "password" {
+  type        = string
+  description = "Database user password"
+}
+
+variable "hostname" {
+  type        = string
+  description = "Database hostname"
+}
+
+variable "port" {
+  type        = number
+  description = "Database port number"
+  default     = null
+}
+
+variable "database_name" {
+  type        = string
+  description = "Database name"
+}