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locals {
function_name_prefix = local.Name
functions = [
"_dns",
"auth",
"elasticsearch",
"kibana",
function_names = [for name in local.functions : "${local.function_name_prefix}-${replace(name, "_", "")}"]
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}
data "aws_iam_policy_document" "lambda_assume_policy" {
statement {
effect = "Allow"
actions = ["sts:AssumeRole"]
principals {
type = "Service"
identifiers = ["lambda.amazonaws.com"]
}
}
}
locals {
lambda_assume_policy_doc = data.aws_iam_policy_document.lambda_assume_policy.json
}
resource "aws_iam_role" "lambda" {
name = local.Name
assume_role_policy = local.lambda_assume_policy_doc
tags = local.common_tags
}
locals {
lambda_role_arn = aws_iam_role.lambda.arn
lambda_role_name = aws_iam_role.lambda.name
}
output "lambda_role_arn" {
description = "ARN of the Lambda function IAM role."
value = local.lambda_role_arn
}
output "lambda_role_name" {
description = "Name of the Lambda function IAM role."
value = local.lambda_role_name
}
locals {
function_role_policies = [
local.publish_policy_arn,
#local.log_policy_arn,
"arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole",
]
}
resource "aws_iam_role_policy_attachment" "function" {
count = length(local.function_role_policies)
role = local.lambda_role_name
policy_arn = local.function_role_policies[count.index]
}
variable "runtime" {
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description = "The Lambda function runtime."
type = string
}
output "runtime" {
description = "The Lambda function runtime."
value = var.runtime
}
variable "memory_size" {
default = 128
description = "Amount of memory in MB allocated to the function invocation."
type = number
}
output "memory_size" {
description = "Amount of memory in MB allocated to the function invocation."
value = var.memory_size
}
variable "timeout" {
default = 30
description = "Amouyynt of time in seconds the function has to run."
type = number
}
output "timeout" {
description = "Amount of memory in MB allocated to the function invocation."
value = var.timeout
}
resource "aws_lambda_function" "function" {
# checkov:skip=CKV_AWS_50
# checkov:skip=CKV_AWS_116
# checkov:skip=CKV_AWS_117
# checkov:skip=CKV_AWS_173
count = length(local.functions)
runtime = var.runtime
function_name = local.function_names[count.index]
role = local.lambda_role_arn
source_code_hash = filebase64sha256("payload.zip")
s3_bucket = local.payloads_bucket_name
s3_key = local.payload_object_name
s3_object_version = local.payload_object_version
package_type = "Zip"
handler = "${local.functions[count.index]}.handler"
description = "${local.module} ${local.functions[count.index]} check in ${local.env}."
memory_size = var.memory_size
reserved_concurrent_executions = -1
tags = local.common_tags
timeout = var.timeout
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environment {
variables = {
ENV = local.env
MODULE = local.module
TOPIC_ARN = local.topic_arn
VERSION = local.payload_object_version
}
}
# Create the log group with retention before the function is created.
# Otherwise it's created without retention and need to be imported.
depends_on = [
aws_cloudwatch_log_group.lambda,
]
}
locals {
function_arns = aws_lambda_function.function.*.arn
function_versions = aws_lambda_function.function.*.version
}
output "function_arns" {
description = "ARNs of the Lambda functions."
value = local.function_arns
}
output "function_names" {
description = "Names of the Lambda functions."
value = local.function_names
}
output "function_versions" {
description = "Versions of the Lambda functions."
value = local.function_versions
}
output "function_version_mapping" {
description = "Mapping of the function and version."
value = zipmap(local.functions, local.function_versions)
}
resource "aws_lambda_alias" "function" {
count = length(local.functions)
name = "${local.function_name_prefix}_${local.functions[count.index]}"
function_name = local.function_arns[count.index]
function_version = local.function_versions[count.index]
}
locals {
function_alias_arns = aws_lambda_alias.function.*.arn
function_alias_names = aws_lambda_alias.function.*.name
}
output "function_alias_arns" {
description = "ARNs of the Lambda functions aliases."
value = local.function_alias_arns
}
output "function_alias_names" {
description = "Names of the Lambda functions aliases."
value = local.function_alias_names
}
resource "aws_lambda_permission" "cloudwatch" {
count = length(local.function_arns)
statement_id = "AllowExecutionFromCloudWatch"
action = "lambda:InvokeFunction"
principal = "events.amazonaws.com"
function_name = local.function_names[count.index]
qualifier = local.function_alias_names[count.index]
}