/terraform-aws-lambda-function

A module for launching Lambda Fuctions

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Cloud Posse

This module deploys an AWS Lambda function from a Zip file or from a Docker image. Additionally, it creates an IAM role for the Lambda function, which optionally attaches policies to allow for CloudWatch Logs, Cloudwatch Insights, VPC Access and X-Ray tracing.

This project is part of our comprehensive "SweetOps" approach towards DevOps.

Terraform Open Source Modules

It's 100% Open Source and licensed under the APACHE2.

We literally have hundreds of terraform modules that are Open Source and well-maintained. Check them out!

Security & Compliance

Security scanning is graciously provided by Bridgecrew. Bridgecrew is the leading fully hosted, cloud-native solution providing continuous Terraform security and compliance.

Benchmark Description
Infrastructure Security Infrastructure Security Compliance
CIS KUBERNETES Center for Internet Security, KUBERNETES Compliance
CIS AWS Center for Internet Security, AWS Compliance
CIS AZURE Center for Internet Security, AZURE Compliance
PCI-DSS Payment Card Industry Data Security Standards Compliance
NIST-800-53 National Institute of Standards and Technology Compliance
ISO27001 Information Security Management System, ISO/IEC 27001 Compliance
SOC2 Service Organization Control 2 Compliance
CIS GCP Center for Internet Security, GCP Compliance
HIPAA Health Insurance Portability and Accountability Compliance

Usage

IMPORTANT: We do not pin modules to versions in our examples because of the difficulty of keeping the versions in the documentation in sync with the latest released versions. We highly recommend that in your code you pin the version to the exact version you are using so that your infrastructure remains stable, and update versions in a systematic way so that they do not catch you by surprise.

Also, because of a bug in the Terraform registry (hashicorp/terraform#21417), the registry shows many of our inputs as required when in fact they are optional. The table below correctly indicates which inputs are required.

For a complete example, see examples/complete. For automated tests of the complete example using bats and Terratest (which tests and deploys the example on AWS), see test.

module "lambda" {
  source  = "cloudposse/lambda-function/aws"
  version = "xxxx"

  filename      = "lambda.zip"
  function_name = "my-function"
  handler       = "handler.handler"
  runtime       = "nodejs14.x"
}

Examples

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Requirements

Name Version
terraform >= 0.14
aws >= 3.0

Providers

Name Version
aws >= 3.0

Modules

Name Source Version
cloudwatch_log_group cloudposse/cloudwatch-logs/aws 0.6.6
this cloudposse/label/null 0.25.0

Resources

Name Type
aws_iam_policy.ssm resource
aws_iam_role.this resource
aws_iam_role_policy_attachment.cloudwatch_insights resource
aws_iam_role_policy_attachment.cloudwatch_logs resource
aws_iam_role_policy_attachment.custom resource
aws_iam_role_policy_attachment.ssm resource
aws_iam_role_policy_attachment.vpc_access resource
aws_iam_role_policy_attachment.xray resource
aws_lambda_function.this resource
aws_caller_identity.this data source
aws_iam_policy_document.assume_role_policy data source
aws_iam_policy_document.ssm data source
aws_partition.this data source
aws_region.this data source

Inputs

Name Description Type Default Required
additional_tag_map Additional key-value pairs to add to each map in tags_as_list_of_maps. Not added to tags or id.
This is for some rare cases where resources want additional configuration of tags
and therefore take a list of maps with tag key, value, and additional configuration.		 map(string) {} no
architectures Instruction set architecture for your Lambda function. Valid values are ["x86_64"] and ["arm64"].
Default is ["x86_64"]. Removing this attribute, function's architecture stay the same.		 list(string) null no
attributes ID element. Additional attributes (e.g. workers or cluster) to add to id,
in the order they appear in the list. New attributes are appended to the
end of the list. The elements of the list are joined by the delimiter
and treated as a single ID element.		 list(string) [] no
cloudwatch_event_rules Creates EventBridge (CloudWatch Events) rules for invoking the Lambda Function along with the required permissions. map(any) {} no
cloudwatch_lambda_insights_enabled Enable CloudWatch Lambda Insights for the Lambda Function. bool false no
cloudwatch_log_subscription_filters CloudWatch Logs subscription filter resources. Currently supports only Lambda functions as destinations. map(any) {} no
cloudwatch_logs_kms_key_arn The ARN of the KMS Key to use when encrypting log data. string null no
cloudwatch_logs_retention_in_days Specifies the number of days you want to retain log events in the specified log group. Possible values are:
1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1827, 3653, and 0. If you select 0, the events in the
log group are always retained and never expire.		 number null no
context Single object for setting entire context at once.
See description of individual variables for details.
Leave string and numeric variables as null to use default value.
Individual variable settings (non-null) override settings in context object,
except for attributes, tags, and additional_tag_map, which are merged.		 any 
{
  "additional_tag_map": {},
  "attributes": [],
  "delimiter": null,
  "descriptor_formats": {},
  "enabled": true,
  "environment": null,
  "id_length_limit": null,
  "label_key_case": null,
  "label_order": [],
  "label_value_case": null,
  "labels_as_tags": [
    "unset"
  ],
  "name": null,
  "namespace": null,
  "regex_replace_chars": null,
  "stage": null,
  "tags": {},
  "tenant": null
}
 no
custom_iam_policy_arns ARNs of custom policies to be attached to the lambda role set(string) [] no
dead_letter_config_target_arn ARN of an SNS topic or SQS queue to notify when an invocation fails. If this option is used, the function's IAM role
must be granted suitable access to write to the target object, which means allowing either the sns:Publish or
sqs:SendMessage action on this ARN, depending on which service is targeted."		 string null no
delimiter Delimiter to be used between ID elements.
Defaults to - (hyphen). Set to "" to use no delimiter at all.		 string null no
description Description of what the Lambda Function does. string null no
descriptor_formats Describe additional descriptors to be output in the descriptors output map.
Map of maps. Keys are names of descriptors. Values are maps of the form
{<br> format = string<br> labels = list(string)<br>}
(Type is any so the map values can later be enhanced to provide additional options.)
format is a Terraform format string to be passed to the format() function.
labels is a list of labels, in order, to pass to format() function.
Label values will be normalized before being passed to format() so they will be
identical to how they appear in id.
Default is {} (descriptors output will be empty).		 any {} no
enabled Set to false to prevent the module from creating any resources bool null no
environment ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT' string null no
event_source_mappings Creates event source mappings to allow the Lambda function to get events from Kinesis, DynamoDB and SQS. The IAM role
of this Lambda function will be enhanced with necessary minimum permissions to get those events.		 any {} no
filename The path to the function's deployment package within the local filesystem. If defined, The s3_-prefixed options and image_uri cannot be used. string null no
function_name Unique name for the Lambda Function. string n/a yes
handler The function entrypoint in your code. string null no
iam_policy_description Description of the IAM policy for the Lambda IAM role string "Provides minimum SSM read permissions." no
id_length_limit Limit id to this many characters (minimum 6).
Set to 0 for unlimited length.
Set to null for keep the existing setting, which defaults to 0.
Does not affect id_full.		 number null no
ignore_external_function_updates Ignore updates to the Lambda Function executed externally to the Terraform lifecycle. Set this to true if you're
using CodeDeploy, aws CLI or other external tools to update the Lambda Function code."		 bool false no
image_config The Lambda OCI image configurations
block with three (optional) arguments:
- entry_point - The ENTRYPOINT for the docker image (type list(string)).
- command - The CMD for the docker image (type list(string)).
- working_directory - The working directory for the docker image (type string).		 any {} no
image_uri The ECR image URI containing the function's deployment package. Conflicts with filename, s3_bucket, s3_key, and s3_object_version. string null no
kms_key_arn Amazon Resource Name (ARN) of the AWS Key Management Service (KMS) key that is used to encrypt environment variables.
If this configuration is not provided when environment variables are in use, AWS Lambda uses a default service key.
If this configuration is provided when environment variables are not in use, the AWS Lambda API does not save this
configuration and Terraform will show a perpetual difference of adding the key. To fix the perpetual difference,
remove this configuration.		 string "" no
label_key_case Controls the letter case of the tags keys (label names) for tags generated by this module.
Does not affect keys of tags passed in via the tags input.
Possible values: lower, title, upper.
Default value: title.		 string null no
label_order The order in which the labels (ID elements) appear in the id.
Defaults to ["namespace", "environment", "stage", "name", "attributes"].
You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.		 list(string) null no
label_value_case Controls the letter case of ID elements (labels) as included in id,
set as tag values, and output by this module individually.
Does not affect values of tags passed in via the tags input.
Possible values: lower, title, upper and none (no transformation).
Set this to title and set delimiter to "" to yield Pascal Case IDs.
Default value: lower.		 string null no
labels_as_tags Set of labels (ID elements) to include as tags in the tags output.
Default is to include all labels.
Tags with empty values will not be included in the tags output.
Set to [] to suppress all generated tags.
Notes:
The value of the name tag, if included, will be the id, not the name.
Unlike other null-label inputs, the initial setting of labels_as_tags cannot be
changed in later chained modules. Attempts to change it will be silently ignored.		 set(string) 
[
  "default"
]
 no
lambda_at_edge_enabled Enable Lambda@Edge for your Node.js or Python functions. The required trust relationship and publishing of function versions will be configured in this module. bool false no
lambda_environment Environment (e.g. env variables) configuration for the Lambda function enable you to dynamically pass settings to your function code and libraries. 
object({
    variables = map(string)
  })
 null no
layers List of Lambda Layer Version ARNs (maximum of 5) to attach to the Lambda Function. list(string) [] no
memory_size Amount of memory in MB the Lambda Function can use at runtime. number 128 no
name ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'.
This is the only ID element not also included as a tag.
The "name" tag is set to the full id string. There is no tag with the value of the name input.		 string null no
namespace ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique string null no
package_type The Lambda deployment package type. Valid values are Zip and Image. string "Zip" no
permissions_boundary ARN of the policy that is used to set the permissions boundary for the role string "" no
publish Whether to publish creation/change as new Lambda Function Version. bool false no
regex_replace_chars Terraform regular expression (regex) string.
Characters matching the regex will be removed from the ID elements.
If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.		 string null no
reserved_concurrent_executions The amount of reserved concurrent executions for this lambda function. A value of 0 disables lambda from being triggered and -1 removes any concurrency limitations. number -1 no
runtime The runtime environment for the Lambda function you are uploading. string null no
s3_bucket The S3 bucket location containing the function's deployment package. Conflicts with filename and image_uri.
This bucket must reside in the same AWS region where you are creating the Lambda function.		 string null no
s3_key The S3 key of an object containing the function's deployment package. Conflicts with filename and image_uri. string null no
s3_object_version The object version containing the function's deployment package. Conflicts with filename and image_uri. string null no
sns_subscriptions Creates subscriptions to SNS topics which trigger the Lambda Function. Required Lambda invocation permissions will be generated. map(any) {} no
source_code_hash Used to trigger updates. Must be set to a base64-encoded SHA256 hash of the package file specified with either
filename or s3_key. The usual way to set this is filebase64sha256('file.zip') where 'file.zip' is the local filename
of the lambda function source archive.		 string "" no
ssm_parameter_names List of AWS Systems Manager Parameter Store parameter names. The IAM role of this Lambda function will be enhanced
with read permissions for those parameters. Parameters must start with a forward slash and can be encrypted with the
default KMS key.		 list(string) null no
stage ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release' string null no
tags Additional tags (e.g. {'BusinessUnit': 'XYZ'}).
Neither the tag keys nor the tag values will be modified by this module.		 map(string) {} no
tenant ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for string null no
timeout The amount of time the Lambda Function has to run in seconds. number 3 no
tracing_config_mode Tracing config mode of the Lambda function. Can be either PassThrough or Active. string null no
vpc_config Provide this to allow your function to access your VPC (if both 'subnet_ids' and 'security_group_ids' are empty then
vpc_config is considered to be empty or unset, see https://docs.aws.amazon.com/lambda/latest/dg/vpc.html for details).		 
object({
    security_group_ids = list(string)
    subnet_ids         = list(string)
  })
 null no

Outputs

Name Description
arn ARN of the lambda function
function_name Lambda function name
invoke_arn Invoke ARN of the lambda function
qualified_arn ARN identifying your Lambda Function Version (if versioning is enabled via publish = true)
role_arn Lambda IAM role ARN
role_name Lambda IAM role name

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Related Projects

Check out these related projects.

  • terraform-null-label - Terraform module designed to generate consistent names and tags for resources. Use terraform-null-label to implement a strict naming convention.

References

For additional context, refer to some of these links.

  • Cloud Posse Documentation - The Cloud Posse Developer Hub (documentation)
  • Terraform Standard Module Structure - HashiCorp's standard module structure is a file and directory layout we recommend for reusable modules distributed in separate repositories.
  • Terraform Module Requirements - HashiCorp's guidance on all the requirements for publishing a module. Meeting the requirements for publishing a module is extremely easy.
  • Terraform Version Pinning - The required_version setting can be used to constrain which versions of the Terraform CLI can be used with your configuration

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Copyrights

Copyright © 2022-2022 Cloud Posse, LLC

License

License

See LICENSE for full details.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
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Contributors

Matt Calhoun
Matt Calhoun		 PePe Amengual
PePe Amengual		 Andriy Knysh
Andriy Knysh

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