update terraform example

Author: niqdev

docs/terraform.md

@@ -61,3 +61,9 @@ terraform plan -out=plan.out
 terraform show -json plan.out
 terraform apply plan.out
 ```
+
+Mad Libs example
+```sh
+terraform init && terraform apply -auto-approve
+terraform destroy
+```

terraform/book/.terraform.lock.hcl

@@ -3,6 +3,12 @@ terraform {
     random = {
       source = "hashicorp/random"
     }
+    local = {
+      source = "hashicorp/local"
+    }
+    archive = {
+      source = "hashicorp/archive"
+    }
   }
 }
 
@@ -23,28 +29,83 @@ variable "words" {
   }
 }
 
+variable "num_files" {
+  default = 100
+  type    = number
+}
+
+locals {
+  uppercase_words = { for k, v in var.words : k => [for s in v : upper(s)] }
+}
+
+# "count" is a meta argument, which means all resources intrinsically support it
+# the address of a managed resource uses the format <RESOURCE TYPE>.<NAME>
+# if "count" is set, the value of this expression becomes a list of objects
+# representing all possible resource instances
+# therefore, we could access the Nth instance in the list
+# with bracket notation: <RESOURCE TYPE>.<NAME>[N]
+
+# the expression "[][0]" always throws an error if it's evaluated
+# (since it attempts to access the first element of an empty list)
+
 resource "random_shuffle" "random_nouns" {
-  input = var.words["nouns"]
+  #input = var.words["nouns"]
+  count = var.num_files
+  input = local.uppercase_words["nouns"]
 }
 resource "random_shuffle" "random_adjectives" {
-  input = var.words["adjectives"]
+  #input = var.words["adjectives"]
+  count = var.num_files
+  input = local.uppercase_words["adjectives"]
 }
 resource "random_shuffle" "random_verbs" {
-  input = var.words["verbs"]
+  #input = var.words["verbs"]
+  count = var.num_files
+  input = local.uppercase_words["verbs"]
 }
 resource "random_shuffle" "random_adverbs" {
-  input = var.words["adverbs"]
+  #input = var.words["adverbs"]
+  count = var.num_files
+  input = local.uppercase_words["adverbs"]
 }
 resource "random_shuffle" "random_numbers" {
-  input = var.words["numbers"]
+  #input = var.words["numbers"]
+  count = var.num_files
+  input = local.uppercase_words["numbers"]
+}
+
+# output "mad_libs" {
+#   value = templatefile("${path.module}/templates/alice.txt", {
+#     nouns      = random_shuffle.random_nouns.result
+#     adjectives = random_shuffle.random_adjectives.result
+#     verbs      = random_shuffle.random_verbs.result
+#     adverbs    = random_shuffle.random_adverbs.result
+#     numbers    = random_shuffle.random_numbers.result
+#   })
+# }
+
+locals {
+  templates = tolist(fileset(path.module, "templates/*.txt"))
 }
 
-output "mad_libs" {
-  value = templatefile("${path.module}/templates/alice.txt", {
-    nouns      = random_shuffle.random_nouns.result
-    adjectives = random_shuffle.random_adjectives.result
-    verbs      = random_shuffle.random_verbs.result
-    adverbs    = random_shuffle.random_adverbs.result
-    numbers    = random_shuffle.random_numbers.result
+resource "local_file" "mad_libs" {
+  count    = var.num_files
+  filename = "madlibs/madlibs-${count.index}.txt"
+  content = templatefile(element(local.templates, count.index),
+    {
+      nouns      = random_shuffle.random_nouns[count.index].result
+      adjectives = random_shuffle.random_adjectives[count.index].result
+      verbs      = random_shuffle.random_verbs[count.index].result
+      adverbs    = random_shuffle.random_adverbs[count.index].result
+      numbers    = random_shuffle.random_numbers[count.index].result
   })
 }
+
+# terraform destroy will not delete madlibs.zip because this file isn’t a managed resource
+# "data sources" do not implement Delete()
+data "archive_file" "mad_libs" {
+  depends_on  = [local_file.mad_libs]
+  type        = "zip"
+  source_dir  = "${path.module}/madlibs"
+  output_path = "${path.cwd}/madlibs.zip"
+}

terraform/book/madlibs.tf

@@ -0,0 +1,12 @@
+THE OBSERVATORY
+Out class when on a field trip to a ${adjectives[0]} observatory. It
+was located on top of a ${nouns[0]}, and it looked like a giant
+${nouns[1]} with a slit down its ${nouns[2]}. We went inside and
+looked through a ${nouns[3]} and were able to see ${nouns[4]}s in
+the sky that were millions of ${nouns[5]}s away. The men and
+women who ${verbs[0]} in the observatory are called
+${nouns[6]}s, and they are always watching for comets, eclipses,
+and shooting ${nouns[7]}s. An eclipse occurs when a ${nouns[8]}
+comes between the earth and the ${nouns[9]} and everything
+gets ${adjectives[1]}. Next week, we place to ${verbs[1]} the
+Museum of Modern ${nouns[10]}.

terraform/book/templates/observatory.txt

@@ -0,0 +1,11 @@
+HOW TO BE A PHOTOGRAPHER
+Many ${adjectives[0]} photographers make big money
+photographing ${nouns[0]}s and beautiful ${nouns[1]}s. They sell
+the prints to ${adjectives[1]} magazines or to agencies who use
+them in ${nouns[2]} advertisements. To be a photographer, you
+have to have a ${nouns[3]} camera. You also need an
+${adjectives[2]} meter and filters and a special close-up
+${nouns[4]}. Then you either hire professional ${nouns[1]}s or go
+out and snap candid pictures of ordinary ${nouns[5]}s. But if you
+want to have a career, you must study very ${adverbs[0]} for at
+least ${numbers[0]} years.