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awslambda.py
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awslambda.py
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# Copyright (c) 2012-2022, Mark Peek <mark@peek.org>
# All rights reserved.
#
# See LICENSE file for full license.
import re
from .. import Join
from . import positive_integer
MINIMUM_MEMORY = 128
MAXIMUM_MEMORY = 10240
def validate_memory_size(memory_value):
"""Validate memory size for Lambda Function
:param memory_value: The memory size specified in the Function
:return: The provided memory size if it is valid
Property: Function.MemorySize
"""
memory_value = int(positive_integer(memory_value))
if not MINIMUM_MEMORY <= memory_value <= MAXIMUM_MEMORY:
raise ValueError(
"Lambda Function memory size must be between %d and %d"
% (MINIMUM_MEMORY, MAXIMUM_MEMORY)
)
return memory_value
def validate_package_type(package_type):
"""Validate PackageType for Lambda Function.
:param package_type: The PackageType specified in the Function.
:return: The provided package type if it is valid.
Property: Function.PackageType
"""
PACKAGE_TYPES = ["Image", "Zip"]
if package_type not in PACKAGE_TYPES:
raise ValueError(
"Lambda Function PackageType must be one of: {}".format(
", ".join(PACKAGE_TYPES)
)
)
return package_type
def validate_variables_name(variables):
"""
Validate variable names for Lambda Function.
Property: Environment.Variables
"""
RESERVED_ENVIRONMENT_VARIABLES = [
"AWS_ACCESS_KEY",
"AWS_ACCESS_KEY_ID",
"AWS_DEFAULT_REGION",
"AWS_EXECUTION_ENV",
"AWS_LAMBDA_FUNCTION_MEMORY_SIZE",
"AWS_LAMBDA_FUNCTION_NAME",
"AWS_LAMBDA_FUNCTION_VERSION",
"AWS_LAMBDA_LOG_GROUP_NAME",
"AWS_LAMBDA_LOG_STREAM_NAME",
"AWS_REGION",
"AWS_SECRET_ACCESS_KEY",
"AWS_SECRET_KEY",
"AWS_SECURITY_TOKEN",
"AWS_SESSION_TOKEN",
"LAMBDA_RUNTIME_DIR",
"LAMBDA_TASK_ROOT",
"TZ",
]
ENVIRONMENT_VARIABLES_NAME_PATTERN = r"[a-zA-Z][a-zA-Z0-9_]+"
for name in variables:
if name in RESERVED_ENVIRONMENT_VARIABLES:
raise ValueError(
"Lambda Function environment variables names"
" can't be none of:\n %s" % ", ".join(RESERVED_ENVIRONMENT_VARIABLES)
)
elif not re.match(ENVIRONMENT_VARIABLES_NAME_PATTERN, name):
raise ValueError("Invalid environment variable name: %s" % name)
return variables
def check_zip_file(zip_file):
maxlength = 4096
toolong = (
"ZipFile length cannot exceed %d characters. For larger "
"source use S3Bucket/S3Key properties instead. "
"Current length: %d"
)
if zip_file is None:
return
if isinstance(zip_file, str):
z_length = len(zip_file)
if z_length > maxlength:
raise ValueError(toolong % (maxlength, z_length))
return
if isinstance(zip_file, Join):
# This code tries to combine the length of all the strings in a
# join. If a part is not a string, we do not count it (length 0).
delimiter, values = zip_file.data["Fn::Join"]
# Return if there are no values to join
if not values or len(values) <= 0:
return
# Get the length of the delimiter
if isinstance(delimiter, str):
d_length = len(delimiter)
else:
d_length = 0
# Get the length of each value that will be joined
v_lengths = [len(v) for v in values if isinstance(v, str)]
# Add all the lengths together
z_length = sum(v_lengths)
z_length += (len(values) - 1) * d_length
if z_length > maxlength:
raise ValueError(toolong % (maxlength, z_length))
return
def validate_code(self):
"""
Class: Code
"""
image_uri = self.properties.get("ImageUri")
zip_file = self.properties.get("ZipFile")
s3_bucket = self.properties.get("S3Bucket")
s3_key = self.properties.get("S3Key")
s3_object_version = self.properties.get("S3ObjectVersion")
if zip_file and image_uri:
raise ValueError("You can't specify both 'ImageUri' and 'ZipFile'")
if zip_file and s3_bucket:
raise ValueError("You can't specify both 'S3Bucket' and 'ZipFile'")
if zip_file and s3_key:
raise ValueError("You can't specify both 'S3Key' and 'ZipFile'")
if zip_file and s3_object_version:
raise ValueError("You can't specify both 'S3ObjectVersion' and 'ZipFile'")
if image_uri and (s3_bucket or s3_key or s3_object_version):
raise ValueError(
"You can't specify 'ImageUri' and any of 'S3Bucket', 'S3Key', "
"or 'S3ObjectVersion' at the same time"
)
check_zip_file(zip_file)
if not zip_file and not (s3_bucket and s3_key) and not image_uri:
raise ValueError(
"You must specify a bucket location (both the 'S3Bucket' and "
"'S3Key' properties), the 'ImageUri' property, "
"or the 'ZipFile' property"
)
def validate_image_config(self):
"""
Class: ImageConfig
"""
command = self.properties.get("Command")
if command and len(command) > 1500:
raise ValueError("Maximum items in 'Command' is 1500")
entry_point = self.properties.get("EntryPoint")
if entry_point and len(entry_point) > 1500:
raise ValueError("Maximum items in 'EntryPoint' is 1500")
working_directory = self.properties.get("WorkingDirectory")
if working_directory and len(working_directory) > 1000:
raise ValueError("Maximum length of 'WorkingDirectory' is 1000")