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@aws-cdk/assets
Advanced tools
Assets are local files or directories which are needed by a CDK app. A common example is a directory which contains the handler code for a Lambda function, but assets can represent any artifact that is needed for the app's operation.
When deploying a CDK app that includes constructs with assets, the CDK toolkit will first upload all the assets to S3, and only then deploy the stacks. The S3 locations of the uploaded assets will be passed in as CloudFormation Parameters to the relevant stacks.
The following JavaScript example defines an directory asset which is archived as a .zip file and uploaded to S3 during deployment.
Example of a ZipDirectoryAsset
The following JavaScript example defines a file asset, which is uploaded as-is to an S3 bucket during deployment.
Asset
constructs expose the following deploy-time attributes:
s3BucketName
- the name of the assets S3 bucket.s3ObjectKey
- the S3 object key of the asset file (whether it's a file or a zip archive)s3Url
- the S3 URL of the asset (i.e. https://s3.us-east-1.amazonaws.com/mybucket/mykey.zip)In the following example, the various asset attributes are exported as stack outputs:
Example of referencing an asset
IAM roles, users or groups which need to be able to read assets in runtime will should be
granted IAM permissions. To do that use the asset.grantRead(principal)
method:
The following examples grants an IAM group read permissions on an asset:
Example of granting read access to an asset
When an asset is defined in a construct, a construct metadata entry
aws:cdk:asset
is emitted with instructions on where to find the asset and what
type of packaging to perform (zip
or file
). Furthermore, the synthesized
CloudFormation template will also include two CloudFormation parameters: one for
the asset's bucket and one for the asset S3 key. Those parameters are used to
reference the deploy-time values of the asset (using { Ref: "Param" }
).
Then, when the stack is deployed, the toolkit will package the asset (i.e. zip the directory), calculate an MD5 hash of the contents and will render an S3 key for this asset within the toolkit's asset store. If the file doesn't exist in the asset store, it is uploaded during deployment.
The toolkit's asset store is an S3 bucket created by the toolkit for each environment the toolkit operates in (environment = account + region).
Now, when the toolkit deploys the stack, it will set the relevant CloudFormation Parameters to point to the actual bucket and key for each asset.
NOTE: This section is relevant for authors of AWS Resource Constructs.
In certain situations, it is desirable for tools to be able to know that a certain CloudFormation resource is using a local asset. For example, SAM CLI can be used to invoke AWS Lambda functions locally for debugging purposes.
To enable such use cases, external tools will consult a set of metadata entries on AWS CloudFormation resources:
aws:asset:path
points to the local path of the asset.aws:asset:property
is the name of the resource property where the asset is usedUsing these two metadata entries, tools will be able to identify that assets are used by a certain resource, and enable advanced local experiences.
To add these metadata entries to a resource, use the
asset.addResourceMetadata(resource, property)
method.
See https://github.com/awslabs/aws-cdk/issues/1432 for more details
0.29.0 (2019-04-24)
app.run()
(#2300) (47ff448), closes #2289 awslabs/jsii#456Code
, CfnParametersCode
. (#2027) (4247966)MetricCustomization
to MetricOptions
.outputArtifact
and outputArtifacts
properties.inputArtifact(s)
and additionalInputArtifacts
properties were renamed to input(s)
and extraInputs
.outputArtifactName(s)
and additionalOutputArtifactNames
properties were renamed to output(s)
and extraOutputs
.CodeBuildBuildAction
and CodeBuildTestAction
were merged into one class CodeBuildAction
.JenkinsBuildAction
and JenkinsTestAction
were merged into one class JenkinsAction
.lambda.Function
no longer implements IEventRuleTarget
. Instead, use @aws-cdk/aws-events-targets.LambdaFunction
.sns.Topic
no longer implements IEventRuleTarget
. Use @aws-cdk/aws-events-targets.SnsTopic
instead.codebuild.Project
no longer implements IEventRuleTarget
. Use @aws-cdk/aws-events-targets.CodeBuildProject
.cdk.Root
construct has been removed. Use cdk.App
instead.stepfunctions.WaitProps
: the props seconds
, timestamp
, secondsPath
and timestampPath
are now duration
of a union-like class WaitDuration
(e.g. duration: WaitDuration.seconds(n)
)codedeploy.ServerDeploymentConfigProps
: the props minHealthyHostCount
and minHealthyHostPercentage
are now minimumHealthyHosts
of union-like class MinimumHealthyHosts
(e.g. minimumHealthyHosts: MinimumHealthyHosts.percentage(50)
)cloudformation.CustomResourceProps
: the props topicProvider
and lambdaProvider
are now provider
of union-like class CustomResourceProvider
(e.g. CustomResourceProvider.lambda(fn)
cloudformation.CustomResource
no longer extends CfnCustomResource
.ssm.ParameterProps
renamed to ssm.ParameterOptions
.aws-ec2.InstanceSize.None
was renamed to InstanceSize.Nano
vpc.selectSubnetIds(...)
has been replaced with vpc.selectSubnets(...).subnetIds
.FAQs
This module is deprecated. All types are now available under the core module
The npm package @aws-cdk/assets receives a total of 83,607 weekly downloads. As such, @aws-cdk/assets popularity was classified as popular.
We found that @aws-cdk/assets demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 4 open source maintainers collaborating on the project.
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