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import io
import json
import re
import zipfile
from string import Template
from uuid import uuid4
import boto3
import pytest
from botocore.exceptions import ClientError
from moto import mock_aws
def random_stack_name():
return str(uuid4())[0:6]
def _process_lambda(func_str):
zip_output = io.BytesIO()
zip_file = zipfile.ZipFile(zip_output, "w", zipfile.ZIP_DEFLATED)
zip_file.writestr("lambda_function.py", func_str)
zip_file.close()
zip_output.seek(0)
return zip_output.read()
def get_zip_file():
pfunc = """
def lambda_handler1(event, context):
return event
def lambda_handler2(event, context):
return event
"""
return _process_lambda(pfunc)
template = Template(
"""{
"AWSTemplateFormatVersion": "2010-09-09",
"Resources": {
"LF3ABOV": {
"Type": "AWS::Lambda::Function",
"Properties": {
"Handler": "$handler",
"Role": "$role_arn",
"Runtime": "$runtime",
"Code": {
"S3Bucket": "$bucket_name",
"S3Key": "$key"
},
}
}
}
}"""
)
code_image_template = {
"AWSTemplateFormatVersion": "2010-09-09",
"Resources": {
"LambdaFunction": {
"Type": "AWS::Lambda::Function",
"Properties": {
"FunctionName": "ContainerLambdaFunction",
"Role": "dummy-role-arn",
"Code": {
"ImageUri": "123456789012.dkr.ecr.us-west-2.amazonaws.com/my-lambda-container:latest"
},
"PackageType": "Image",
"MemorySize": 128,
"Timeout": 30,
},
}
},
}
event_source_mapping_template = Template(
"""{
"AWSTemplateFormatVersion": "2010-09-09",
"Resources": {
"$resource_name": {
"Type": "AWS::Lambda::EventSourceMapping",
"Properties": {
"BatchSize": $batch_size,
"EventSourceArn": $event_source_arn,
"FunctionName": $function_name,
"Enabled": $enabled
}
}
}
}"""
)
@mock_aws
def test_lambda_can_be_updated_by_cloudformation():
s3 = boto3.client("s3", "us-east-1")
cf = boto3.client("cloudformation", region_name="us-east-1")
lmbda = boto3.client("lambda", region_name="us-east-1")
body2, stack = create_stack(cf, s3)
stack_name = re.search(":stack/(.+)/", stack["StackId"]).group(1)
created_fn_name = get_created_function_name(cf, stack)
# Verify function has been created
created_fn = lmbda.get_function(FunctionName=created_fn_name)
assert created_fn["Configuration"]["Handler"] == "lambda_function.lambda_handler1"
assert created_fn["Configuration"]["Runtime"] == "python3.9"
assert "/test1.zip" in created_fn["Code"]["Location"]
# Update CF stack
cf.update_stack(StackName=stack_name, TemplateBody=body2)
updated_fn_name = get_created_function_name(cf, stack)
# Verify function has been updated
updated_fn = lmbda.get_function(FunctionName=updated_fn_name)
assert (
updated_fn["Configuration"]["FunctionArn"]
== created_fn["Configuration"]["FunctionArn"]
)
assert updated_fn["Configuration"]["Handler"] == "lambda_function.lambda_handler2"
assert updated_fn["Configuration"]["Runtime"] == "python3.10"
assert "/test2.zip" in updated_fn["Code"]["Location"]
@mock_aws
def test_lambda_can_be_deleted_by_cloudformation():
s3 = boto3.client("s3", "us-east-1")
cf = boto3.client("cloudformation", region_name="us-east-1")
lmbda = boto3.client("lambda", region_name="us-east-1")
_, stack = create_stack(cf, s3)
created_fn_name = get_created_function_name(cf, stack)
# Delete Stack
cf.delete_stack(StackName=stack["StackId"])
# Verify function was deleted
with pytest.raises(ClientError) as e:
lmbda.get_function(FunctionName=created_fn_name)
assert e.value.response["Error"]["Code"] == "ResourceNotFoundException"
@mock_aws
def test_lambda_with_code_image_can_be_created():
our_template = code_image_template.copy()
our_template["Resources"]["LambdaFunction"]["Properties"]["Role"] = get_role_arn()
stack_name = f"stack{str(uuid4())[0:6]}"
cf = boto3.client("cloudformation", region_name="us-east-1")
cf.create_stack(StackName=stack_name, TemplateBody=json.dumps(code_image_template))
lmbda = boto3.client("lambda", region_name="us-east-1")
functions = lmbda.list_functions()["Functions"]
function_names = [f["FunctionName"] for f in functions]
assert "ContainerLambdaFunction" in function_names
cf.delete_stack(StackName=stack_name)
functions = lmbda.list_functions()["Functions"]
function_names = [f["FunctionName"] for f in functions]
assert "ContainerLambdaFunction" not in function_names
@mock_aws
def test_event_source_mapping_create_from_cloudformation_json():
sqs = boto3.resource("sqs", region_name="us-east-1")
s3 = boto3.client("s3", "us-east-1")
cf = boto3.client("cloudformation", region_name="us-east-1")
lmbda = boto3.client("lambda", region_name="us-east-1")
queue = sqs.create_queue(QueueName=str(uuid4())[0:6])
# Creates lambda
_, lambda_stack = create_stack(cf, s3)
created_fn_name = get_created_function_name(cf, lambda_stack)
created_fn_arn = lmbda.get_function(FunctionName=created_fn_name)["Configuration"][
"FunctionArn"
]
esm_template = event_source_mapping_template.substitute(
{
"resource_name": "Foo",
"batch_size": 1,
"event_source_arn": queue.attributes["QueueArn"],
"function_name": created_fn_name,
"enabled": True,
}
)
cf.create_stack(StackName=random_stack_name(), TemplateBody=esm_template)
event_sources = lmbda.list_event_source_mappings(FunctionName=created_fn_name)
assert len(event_sources["EventSourceMappings"]) == 1
event_source = event_sources["EventSourceMappings"][0]
assert event_source["EventSourceArn"] == queue.attributes["QueueArn"]
assert event_source["FunctionArn"] == created_fn_arn
@mock_aws
def test_event_source_mapping_delete_stack():
sqs = boto3.resource("sqs", region_name="us-east-1")
s3 = boto3.client("s3", "us-east-1")
cf = boto3.client("cloudformation", region_name="us-east-1")
lmbda = boto3.client("lambda", region_name="us-east-1")
queue = sqs.create_queue(QueueName=str(uuid4())[0:6])
# Creates lambda
_, lambda_stack = create_stack(cf, s3)
created_fn_name = get_created_function_name(cf, lambda_stack)
esm_template = event_source_mapping_template.substitute(
{
"resource_name": "Foo",
"batch_size": 1,
"event_source_arn": queue.attributes["QueueArn"],
"function_name": created_fn_name,
"enabled": True,
}
)
esm_stack = cf.create_stack(
StackName=random_stack_name(), TemplateBody=esm_template
)
event_sources = lmbda.list_event_source_mappings(FunctionName=created_fn_name)
assert len(event_sources["EventSourceMappings"]) == 1
cf.delete_stack(StackName=esm_stack["StackId"])
event_sources = lmbda.list_event_source_mappings(FunctionName=created_fn_name)
assert len(event_sources["EventSourceMappings"]) == 0
@mock_aws
def test_event_source_mapping_update_from_cloudformation_json():
sqs = boto3.resource("sqs", region_name="us-east-1")
s3 = boto3.client("s3", "us-east-1")
cf = boto3.client("cloudformation", region_name="us-east-1")
lmbda = boto3.client("lambda", region_name="us-east-1")
queue = sqs.create_queue(QueueName=str(uuid4())[0:6])
# Creates lambda
_, lambda_stack = create_stack(cf, s3)
created_fn_name = get_created_function_name(cf, lambda_stack)
original_template = event_source_mapping_template.substitute(
{
"resource_name": "Foo",
"batch_size": 1,
"event_source_arn": queue.attributes["QueueArn"],
"function_name": created_fn_name,
"enabled": True,
}
)
stack_name = random_stack_name()
cf.create_stack(StackName=stack_name, TemplateBody=original_template)
event_sources = lmbda.list_event_source_mappings(FunctionName=created_fn_name)
original_esm = event_sources["EventSourceMappings"][0]
assert original_esm["State"] == "Enabled"
assert original_esm["BatchSize"] == 1
# Update
new_template = event_source_mapping_template.substitute(
{
"resource_name": "Foo",
"batch_size": 10,
"event_source_arn": queue.attributes["QueueArn"],
"function_name": created_fn_name,
"enabled": False,
}
)
cf.update_stack(StackName=stack_name, TemplateBody=new_template)
event_sources = lmbda.list_event_source_mappings(FunctionName=created_fn_name)
updated_esm = event_sources["EventSourceMappings"][0]
assert updated_esm["State"] == "Disabled"
assert updated_esm["BatchSize"] == 10
@mock_aws
def test_event_source_mapping_delete_from_cloudformation_json():
sqs = boto3.resource("sqs", region_name="us-east-1")
s3 = boto3.client("s3", "us-east-1")
cf = boto3.client("cloudformation", region_name="us-east-1")
lmbda = boto3.client("lambda", region_name="us-east-1")
queue = sqs.create_queue(QueueName=str(uuid4())[0:6])
# Creates lambda
_, lambda_stack = create_stack(cf, s3)
created_fn_name = get_created_function_name(cf, lambda_stack)
original_template = event_source_mapping_template.substitute(
{
"resource_name": "Foo",
"batch_size": 1,
"event_source_arn": queue.attributes["QueueArn"],
"function_name": created_fn_name,
"enabled": True,
}
)
stack_name = random_stack_name()
cf.create_stack(StackName=stack_name, TemplateBody=original_template)
event_sources = lmbda.list_event_source_mappings(FunctionName=created_fn_name)
original_esm = event_sources["EventSourceMappings"][0]
assert original_esm["State"] == "Enabled"
assert original_esm["BatchSize"] == 1
# Update with deletion of old resources
new_template = event_source_mapping_template.substitute(
{
"resource_name": "Bar", # changed name
"batch_size": 10,
"event_source_arn": queue.attributes["QueueArn"],
"function_name": created_fn_name,
"enabled": False,
}
)
cf.update_stack(StackName=stack_name, TemplateBody=new_template)
event_sources = lmbda.list_event_source_mappings(FunctionName=created_fn_name)
assert len(event_sources["EventSourceMappings"]) == 1
updated_esm = event_sources["EventSourceMappings"][0]
assert updated_esm["State"] == "Disabled"
assert updated_esm["BatchSize"] == 10
assert updated_esm["UUID"] != original_esm["UUID"]
def create_stack(cf, s3):
bucket_name = str(uuid4())
stack_name = random_stack_name()
s3.create_bucket(Bucket=bucket_name)
s3.put_object(Bucket=bucket_name, Key="test1.zip", Body=get_zip_file())
s3.put_object(Bucket=bucket_name, Key="test2.zip", Body=get_zip_file())
body1 = get_template(bucket_name, "1", "python3.9")
body2 = get_template(bucket_name, "2", "python3.10")
stack = cf.create_stack(StackName=stack_name, TemplateBody=body1)
return body2, stack
def get_created_function_name(cf, stack):
res = cf.list_stack_resources(StackName=stack["StackId"])
return res["StackResourceSummaries"][0]["PhysicalResourceId"]
def get_template(bucket_name, version, runtime):
key = "test" + version + ".zip"
handler = "lambda_function.lambda_handler" + version
return template.substitute(
bucket_name=bucket_name,
key=key,
handler=handler,
role_arn=get_role_arn(),
runtime=runtime,
)
def get_role_arn():
iam = boto3.client("iam", region_name="us-west-2")
try:
iam.create_role(
RoleName="my-role",
AssumeRolePolicyDocument="some policy",
Path="/my-path/",
)
except ClientError:
pass # Will fail second/third time - difficult to execute once with parallel tests
return iam.get_role(RoleName="my-role")["Role"]["Arn"]
|
