Add pre-commit config to run terraform fmt

Run the hook to format all the code and enforce this via CI to avoid
regressions. This is to keep formatting consistent and not a thing to
worry/think about when developing or in PRs

Author: matthewhughes-uw

.github/workflows/pr.yaml

@@ -0,0 +1,14 @@
+name: Checks
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: hashicorp/setup-terraform@v3
+    - uses: pre-commit/action@v3

.pre-commit-config.yaml

@@ -0,0 +1,5 @@
+repos:
+- repo: https://github.com/antonbabenko/pre-commit-terraform
+  rev: v1.86.0
+  hooks:
+    - id: terraform_fmt

CONTRIBUTING.md

@@ -0,0 +1,11 @@
+## Linting
+
+Linting is handled via `pre-commit`. Follow the [install
+instructions](https://pre-commit.com/#install), and additionally [install
+Terraform](https://developer.hashicorp.com/terraform/install) then install and
+run the hooks:
+
+``` console
+$ pre-commit install
+$ pre-commit run --all-hooks
+```

dev-aws/finance/debt.tf

@@ -41,7 +41,7 @@ resource "kafka_topic" "account-debt-events" {
 }
 
 resource "kafka_topic" "debt-collection-events" {
-  name = "debt-collection.events"
+  name               = "debt-collection.events"
   replication_factor = 3
   partitions         = 3
   config = {

dev-aws/finance/direct-debits.tf

@@ -15,9 +15,9 @@ resource "kafka_topic" "dd_run_reconciliation_events" {
   partitions         = 10
   config = {
     "max.message.bytes" = "1048576"
-    "retention.bytes" = "-1"
-    "retention.ms"    = "259200000" #3 days, maybe worth doing it less
-    "cleanup.policy"  = "delete"
+    "retention.bytes"   = "-1"
+    "retention.ms"      = "259200000" #3 days, maybe worth doing it less
+    "cleanup.policy"    = "delete"
   }
 }
 

dev-aws/finance/disputes-fabricator.tf

@@ -10,7 +10,7 @@ resource "kafka_topic" "comms-eqdb-loader-events" {
 }
 
 resource "kafka_topic" "disputes-diffs-events" {
-  name = "disputes-diffs.events"
+  name               = "disputes-diffs.events"
   replication_factor = 3
   partitions         = 10
   config = {

dev-aws/kafka-shared/customer-billing.tf

@@ -2,9 +2,9 @@ resource "kafka_topic" "invoice_fulfillment" {
   name               = "bex.internal.bill_fulfilled"
   replication_factor = 3
   partitions         = 10
-  config             = {
+  config = {
     # keep data for 7 days
-    "retention.ms"      = "604800000"
+    "retention.ms" = "604800000"
     # allow max 1 MB for a message
     "max.message.bytes" = "1048576"
     "compression.type"  = "zstd"
@@ -16,9 +16,9 @@ resource "kafka_topic" "invoice_fulfillment_deadletter" {
   name               = "bex.internal.accountreadytobefulfilled_deadletter"
   replication_factor = 3
   partitions         = 10
-  config             = {
+  config = {
     # keep data for 14 days
-    "retention.ms"      = "1209600000"
+    "retention.ms" = "1209600000"
     # allow max 1 MB for a message
     "max.message.bytes" = "1048576"
     "compression.type"  = "zstd"

dev-aws/kafka-shared/iam_cerbos-audit.tf

@@ -9,8 +9,8 @@ resource "kafka_topic" "iam_cerbos_audit_v1" {
     "retention.ms" = "172800000"
     # allow max 1 MB for a message
     "max.message.bytes" = "1048576"
-    "compression.type" = "zstd"
-    "cleanup.policy"   = "delete"
+    "compression.type"  = "zstd"
+    "cleanup.policy"    = "delete"
   }
 }
 

dev-aws/kafka-shared/iam_identitydb.tf

@@ -2,7 +2,7 @@ resource "kafka_topic" "iam_identitydb_v1" {
   name               = "auth.iam-identitydb-v1"
   replication_factor = 3
   # MUST be 1 partition as identitydb assumes this to be true
-  partitions         = 1
+  partitions = 1
   config = {
     # retain 100MB on each partition
     "retention.bytes" = "104857600"

dev-aws/kafka-shared/kafka-ui.tf

@@ -17,11 +17,11 @@ resource "kafka_acl" "kafka_ui_group" {
 }
 
 resource "kafka_acl" "kafka_ui_cluster" {
-  resource_name       = "kafka-cluster"
-  resource_type       = "Cluster"
-  acl_principal       = "User:CN=pubsub/kafka-ui"
-  acl_host            = "*"
-  acl_operation       = "All"
-  acl_permission_type = "Allow"
+  resource_name                = "kafka-cluster"
+  resource_type                = "Cluster"
+  acl_principal                = "User:CN=pubsub/kafka-ui"
+  acl_host                     = "*"
+  acl_operation                = "All"
+  acl_permission_type          = "Allow"
   resource_pattern_type_filter = "Literal"
 }