AWS Lambda
Developer Guide

UpdateFunctionCode

Updates the code for the specified Lambda function. This operation must only be used on an existing Lambda function and cannot be used to update the function configuration.

If you are using the versioning feature, note this API will always update the $LATEST version of your Lambda function. For information about the versioning feature, see AWS Lambda Function Versioning and Aliases.

This operation requires permission for the lambda:UpdateFunctionCode action.

Request Syntax

PUT /2015-03-31/functions/FunctionName/code HTTP/1.1 Content-type: application/json { "DryRun": boolean, "Publish": boolean, "RevisionId": "string", "S3Bucket": "string", "S3Key": "string", "S3ObjectVersion": "string", "ZipFile": blob }

URI Request Parameters

The request requires the following URI parameters.

FunctionName

The name of the lambda function.

Name formats

  • Function name - MyFunction.

  • Function ARN - arn:aws:lambda:us-west-2:123456789012:function:MyFunction.

  • Partial ARN - 123456789012:function:MyFunction.

The length constraint applies only to the full ARN. If you specify only the function name, it is limited to 64 characters in length.

Length Constraints: Minimum length of 1. Maximum length of 140.

Pattern: (arn:(aws[a-zA-Z-]*)?:lambda:)?([a-z]{2}(-gov)?-[a-z]+-\d{1}:)?(\d{12}:)?(function:)?([a-zA-Z0-9-_]+)(:(\$LATEST|[a-zA-Z0-9-_]+))?

Request Body

The request accepts the following data in JSON format.

DryRun

This boolean parameter can be used to test your request to AWS Lambda to update the Lambda function and publish a version as an atomic operation. It will do all necessary computation and validation of your code but will not upload it or a publish a version. Each time this operation is invoked, the CodeSha256 hash value of the provided code will also be computed and returned in the response.

Type: Boolean

Required: No

Publish

This boolean parameter can be used to request AWS Lambda to update the Lambda function and publish a version as an atomic operation.

Type: Boolean

Required: No

RevisionId

An optional value you can use to ensure you are updating the latest update of the function version or alias. If the RevisionID you pass doesn't match the latest RevisionId of the function or alias, it will fail with an error message, advising you to retrieve the latest function version or alias RevisionID using either using using either GetFunction or GetAlias.

Type: String

Required: No

S3Bucket

Amazon S3 bucket name where the .zip file containing your deployment package is stored. This bucket must reside in the same AWS Region where you are creating the Lambda function.

Type: String

Length Constraints: Minimum length of 3. Maximum length of 63.

Pattern: ^[0-9A-Za-z\.\-_]*(?<!\.)$

Required: No

S3Key

The Amazon S3 object (the deployment package) key name you want to upload.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 1024.

Required: No

S3ObjectVersion

The Amazon S3 object (the deployment package) version you want to upload.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 1024.

Required: No

ZipFile

The contents of your zip file containing your deployment package. If you are using the web API directly, the contents of the zip file must be base64-encoded. If you are using the AWS SDKs or the AWS CLI, the SDKs or CLI will do the encoding for you. For more information about creating a .zip file, see Execution Permissions.

Type: Base64-encoded binary data object

Required: No

Response Syntax

HTTP/1.1 200 Content-type: application/json { "CodeSha256": "string", "CodeSize": number, "DeadLetterConfig": { "TargetArn": "string" }, "Description": "string", "Environment": { "Error": { "ErrorCode": "string", "Message": "string" }, "Variables": { "string" : "string" } }, "FunctionArn": "string", "FunctionName": "string", "Handler": "string", "KMSKeyArn": "string", "LastModified": "string", "MasterArn": "string", "MemorySize": number, "RevisionId": "string", "Role": "string", "Runtime": "string", "Timeout": number, "TracingConfig": { "Mode": "string" }, "Version": "string", "VpcConfig": { "SecurityGroupIds": [ "string" ], "SubnetIds": [ "string" ], "VpcId": "string" } }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

CodeSha256

The SHA256 hash of the function's deployment package.

Type: String

CodeSize

The size of the function's deployment package in bytes.

Type: Long

DeadLetterConfig

The function's dead letter queue.

Type: DeadLetterConfig object

Description

The function's description.

Type: String

Length Constraints: Minimum length of 0. Maximum length of 256.

Environment

The function's environment variables.

Type: EnvironmentResponse object

FunctionArn

The function's Amazon Resource Name.

Type: String

Pattern: arn:(aws[a-zA-Z-]*)?:lambda:[a-z]{2}(-gov)?-[a-z]+-\d{1}:\d{12}:function:[a-zA-Z0-9-_\.]+(:(\$LATEST|[a-zA-Z0-9-_]+))?

FunctionName

The name of the function.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 170.

Pattern: (arn:(aws[a-zA-Z-]*)?:lambda:)?([a-z]{2}(-gov)?-[a-z]+-\d{1}:)?(\d{12}:)?(function:)?([a-zA-Z0-9-_\.]+)(:(\$LATEST|[a-zA-Z0-9-_]+))?

Handler

The function Lambda calls to begin executing your function.

Type: String

Length Constraints: Maximum length of 128.

Pattern: [^\s]+

KMSKeyArn

The KMS key used to encrypt the function's environment variables. Only returned if you've configured a customer managed CMK.

Type: String

Pattern: (arn:(aws[a-zA-Z-]*)?:[a-z0-9-.]+:.*)|()

LastModified

The date and time that the function was last updated, in ISO-8601 format (YYYY-MM-DDThh:mm:ssTZD).

Type: String

MasterArn

The ARN of the master function.

Type: String

Pattern: arn:(aws[a-zA-Z-]*)?:lambda:[a-z]{2}(-gov)?-[a-z]+-\d{1}:\d{12}:function:[a-zA-Z0-9-_]+(:(\$LATEST|[a-zA-Z0-9-_]+))?

MemorySize

The memory allocated to the function

Type: Integer

Valid Range: Minimum value of 128. Maximum value of 3008.

RevisionId

Represents the latest updated revision of the function or alias.

Type: String

Role

The function's execution role.

Type: String

Pattern: arn:(aws[a-zA-Z-]*)?:iam::\d{12}:role/?[a-zA-Z_0-9+=,.@\-_/]+

Runtime

The runtime environment for the Lambda function.

Type: String

Valid Values: nodejs | nodejs4.3 | nodejs6.10 | nodejs8.10 | java8 | python2.7 | python3.6 | dotnetcore1.0 | dotnetcore2.0 | dotnetcore2.1 | nodejs4.3-edge | go1.x

Timeout

The amount of time that Lambda allows a function to run before terminating it.

Type: Integer

Valid Range: Minimum value of 1.

TracingConfig

The function's AWS X-Ray tracing configuration.

Type: TracingConfigResponse object

Version

The version of the Lambda function.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 1024.

Pattern: (\$LATEST|[0-9]+)

VpcConfig

The function's networking configuration.

Type: VpcConfigResponse object

Errors

CodeStorageExceededException

You have exceeded your maximum total code size per account. Limits

HTTP Status Code: 400

InvalidParameterValueException

One of the parameters in the request is invalid. For example, if you provided an IAM role for AWS Lambda to assume in the CreateFunction or the UpdateFunctionConfiguration API, that AWS Lambda is unable to assume you will get this exception.

HTTP Status Code: 400

PreconditionFailedException

The RevisionId provided does not match the latest RevisionId for the Lambda function or alias. Call the GetFunction or the GetAlias API to retrieve the latest RevisionId for your resource.

HTTP Status Code: 412

ResourceNotFoundException

The resource (for example, a Lambda function or access policy statement) specified in the request does not exist.

HTTP Status Code: 404

ServiceException

The AWS Lambda service encountered an internal error.

HTTP Status Code: 500

TooManyRequestsException

HTTP Status Code: 429

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: