Complete the necessary terraform code for all the necessary resources to run

This terraform code doesn't actually provision a bucket, the function assumes
that a bucket is defined elsewhere

.gitignore

@@ -1,3 +1,5 @@
 /target
 .terraform
 terraform.tfvars
+.terraform*
+terraform.tfstate*

deployment.tf

@@ -2,6 +2,29 @@
 # This Terraform file is necessary to configure the basic
 # infrastructure around the Optimize lambda function
 
+resource "aws_lambda_function" "optimize_lambda" {
+  description   = "A simple lambda for optimizing a Delta table"
+  filename      = "target/lambda/lambda-delta-optimize/bootstrap.zip"
+  function_name = "delta-optimize"
+  role          = aws_iam_role.iam_for_lambda.arn
+  handler       = "provided"
+  runtime       = "provided.al2"
+
+  environment {
+    variables = {
+      AWS_LOCKING_PROVIDER = "dynamodb"
+      DATALAKE_LOCATION    = "s3://my-bucket/databases/my-table"
+      RUST_LOG             = "info"
+    }
+  }
+}
+
+variable "s3_bucket_arn" {
+  type        = string
+  default     = "*"
+  description = "The ARN for the S3 bucket that the optimize function will optimize"
+}
+
 variable "aws_access_key" {
   type    = string
   default = ""
@@ -35,28 +58,35 @@ data "aws_iam_policy_document" "assume_role" {
       identifiers = ["lambda.amazonaws.com"]
     }
 
-    actions = ["sts:AssumeRole"]
+    actions = [
+      "sts:AssumeRole",
+    ]
   }
 }
 
+resource "aws_iam_policy" "lambda_permissions" {
+  name = "lambda-optimize-permissions"
+  policy = jsonencode({
+    Version = "2012-10-17"
+    Statement = [
+      {
+        Action   = ["dynamodb:*"]
+        Resource = aws_dynamodb_table.delta-locking-table.arn
+        Effect   = "Allow"
+      },
+      {
+        Action   = ["s3:*"]
+        Resource = var.s3_bucket_arn
+        Effect   = "Allow"
+      }
+    ]
+  })
+}
+
 resource "aws_iam_role" "iam_for_lambda" {
-  name               = "iam_for_lambda"
-  assume_role_policy = data.aws_iam_policy_document.assume_role.json
-}
-
-resource "aws_lambda_function" "optimize_lambda" {
-  description   = "A simple lambda for optimizing a Delta table"
-  filename      = "target/lambda/lambda-delta-optimize/bootstrap.zip"
-  function_name = "delta-optimize"
-  role          = aws_iam_role.iam_for_lambda.arn
-  handler       = "provided"
-  runtime       = "provided.al2"
-
-  environment {
-    variables = {
-      RUST_LOG = "info"
-    }
-  }
+  name                = "iam_for_optimize_lambda"
+  assume_role_policy  = data.aws_iam_policy_document.assume_role.json
+  managed_policy_arns = [aws_iam_policy.lambda_permissions.arn]
 }
 
 resource "aws_cloudwatch_event_rule" "every_hour" {
@@ -78,3 +108,19 @@ resource "aws_lambda_permission" "allow_cloudwatch_to_call_function" {
   principal     = "events.amazonaws.com"
   source_arn    = aws_cloudwatch_event_rule.every_hour.arn
 }
+
+# The DynamoDb table is used for providing safe concurrent writes to delta
+# tables. The name "delta_rs_lock_table" is the hard-coded default in delta-rs
+resource "aws_dynamodb_table" "delta-locking-table" {
+  name         = "delta_rs_lock_table"
+  billing_mode = "PROVISIONED"
+  # Default name of the partition key hard-coded in delta-rs
+  hash_key       = "key"
+  read_capacity  = 10
+  write_capacity = 10
+
+  attribute {
+    name = "key"
+    type = "S"
+  }
+}