@aws-cdk/core
Version:
AWS Cloud Development Kit Core Library
174 lines • 24.5 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.NestedStack = void 0;
const crypto = require("crypto");
const constructs_1 = require("constructs");
const assets_1 = require("./assets");
const cfn_fn_1 = require("./cfn-fn");
const cfn_pseudo_1 = require("./cfn-pseudo");
const cloudformation_generated_1 = require("./cloudformation.generated");
const lazy_1 = require("./lazy");
const stack_1 = require("./stack");
const stack_synthesizers_1 = require("./stack-synthesizers");
const token_1 = require("./token");
// v2 - keep this import as a separate section to reduce merge conflict when forward merging with the v2 branch.
// eslint-disable-next-line
const construct_compat_1 = require("./construct-compat");
const NESTED_STACK_SYMBOL = Symbol.for('@aws-cdk/core.NestedStack');
/**
* (experimental) A CloudFormation nested stack.
*
* When you apply template changes to update a top-level stack, CloudFormation
* updates the top-level stack and initiates an update to its nested stacks.
* CloudFormation updates the resources of modified nested stacks, but does not
* update the resources of unmodified nested stacks.
*
* Furthermore, this stack will not be treated as an independent deployment
* artifact (won't be listed in "cdk list" or deployable through "cdk deploy"),
* but rather only synthesized as a template and uploaded as an asset to S3.
*
* Cross references of resource attributes between the parent stack and the
* nested stack will automatically be translated to stack parameters and
* outputs.
*
* @experimental
*/
class NestedStack extends stack_1.Stack {
/**
* @experimental
*/
constructor(scope, id, props = {}) {
const parentStack = findParentStack(scope);
super(scope, id, {
env: { account: parentStack.account, region: parentStack.region },
synthesizer: new stack_synthesizers_1.NestedStackSynthesizer(parentStack.synthesizer),
});
this._parentStack = parentStack;
// @deprecate: remove this in v2.0 (redundent)
const parentScope = new construct_compat_1.Construct(scope, id + '.NestedStack');
Object.defineProperty(this, NESTED_STACK_SYMBOL, { value: true });
// this is the file name of the synthesized template file within the cloud assembly
this.templateFile = `${this.node.uniqueId}.nested.template.json`;
this.parameters = props.parameters || {};
this.resource = new cloudformation_generated_1.CfnStack(parentScope, `${id}.NestedStackResource`, {
templateUrl: lazy_1.Lazy.stringValue({ produce: () => this._templateUrl || '<unresolved>' }),
parameters: lazy_1.Lazy.anyValue({ produce: () => Object.keys(this.parameters).length > 0 ? this.parameters : undefined }),
notificationArns: props.notificationArns,
timeoutInMinutes: props.timeout ? props.timeout.toMinutes() : undefined,
});
this.nestedStackResource = this.resource;
// context-aware stack name: if resolved from within this stack, return AWS::StackName
// if resolved from the outer stack, use the { Ref } of the AWS::CloudFormation::Stack resource
// which resolves the ARN of the stack. We need to extract the stack name, which is the second
// component after splitting by "/"
this._contextualStackName = this.contextualAttribute(cfn_pseudo_1.Aws.STACK_NAME, cfn_fn_1.Fn.select(1, cfn_fn_1.Fn.split('/', this.resource.ref)));
this._contextualStackId = this.contextualAttribute(cfn_pseudo_1.Aws.STACK_ID, this.resource.ref);
}
/**
* (experimental) Checks if `x` is an object of type `NestedStack`.
*
* @experimental
*/
static isNestedStack(x) {
return x != null && typeof (x) === 'object' && NESTED_STACK_SYMBOL in x;
}
/**
* (experimental) An attribute that represents the name of the nested stack.
*
* This is a context aware attribute:
* - If this is referenced from the parent stack, it will return a token that parses the name from the stack ID.
* - If this is referenced from the context of the nested stack, it will return `{ "Ref": "AWS::StackName" }`
*
* @experimental
* @attribute true
* @example
*
* mystack-mynestedstack-sggfrhxhum7w
*/
get stackName() {
return this._contextualStackName;
}
/**
* (experimental) An attribute that represents the ID of the stack.
*
* This is a context aware attribute:
* - If this is referenced from the parent stack, it will return `{ "Ref": "LogicalIdOfNestedStackResource" }`.
* - If this is referenced from the context of the nested stack, it will return `{ "Ref": "AWS::StackId" }`
*
* @experimental
* @attribute true
* @example
*
* "arn:aws:cloudformation:us-east-2:123456789012:stack/mystack-mynestedstack-sggfrhxhum7w/f449b250-b969-11e0-a185-5081d0136786"
*/
get stackId() {
return this._contextualStackId;
}
/**
* (experimental) Assign a value to one of the nested stack parameters.
*
* @param name The parameter name (ID).
* @param value The value to assign.
* @experimental
*/
setParameter(name, value) {
this.parameters[name] = value;
}
/**
* Defines an asset at the parent stack which represents the template of this
* nested stack.
*
* This private API is used by `App.prepare()` within a loop that rectifies
* references every time an asset is added. This is because (at the moment)
* assets are addressed using CloudFormation parameters.
*
* @returns `true` if a new asset was added or `false` if an asset was
* previously added. When this returns `true`, App will do another reference
* rectification cycle.
*
* @internal
*/
_prepareTemplateAsset() {
if (this._templateUrl) {
return false;
}
const cfn = JSON.stringify(this._toCloudFormation());
const templateHash = crypto.createHash('sha256').update(cfn).digest('hex');
const templateLocation = this._parentStack.addFileAsset({
packaging: assets_1.FileAssetPackaging.FILE,
sourceHash: templateHash,
fileName: this.templateFile,
});
// if bucketName/objectKey are cfn parameters from a stack other than the parent stack, they will
// be resolved as cross-stack references like any other (see "multi" tests).
this._templateUrl = `https://s3.${this._parentStack.region}.${this._parentStack.urlSuffix}/${templateLocation.bucketName}/${templateLocation.objectKey}`;
return true;
}
contextualAttribute(innerValue, outerValue) {
return token_1.Token.asString({
resolve: (context) => {
if (stack_1.Stack.of(context.scope) === this) {
return innerValue;
}
else {
return outerValue;
}
},
});
}
}
exports.NestedStack = NestedStack;
/**
* Validates the scope for a nested stack. Nested stacks must be defined within the scope of another `Stack`.
*/
function findParentStack(scope) {
if (!scope) {
throw new Error('Nested stacks cannot be defined as a root construct');
}
const parentStack = constructs_1.Node.of(scope).scopes.reverse().find(p => stack_1.Stack.isStack(p));
if (!parentStack) {
throw new Error('Nested stacks must be defined within scope of another non-nested stack');
}
return parentStack;
}
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keep this import as a separate section to reduce merge conflict when forward merging with the v2 branch.\n// eslint-disable-next-line\nimport { Construct as CoreConstruct } from './construct-compat';\n\nconst NESTED_STACK_SYMBOL = Symbol.for('@aws-cdk/core.NestedStack');\n\n                                                                                    \nexport interface NestedStackProps {\n                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              \n  readonly parameters?: { [key: string]: string };\n\n                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              \n  readonly timeout?: Duration;\n\n                                                                                                                                                                   \n  readonly notificationArns?: string[];\n}\n\n                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 \nexport class NestedStack extends Stack {\n\n                                                                  \n  public static isNestedStack(x: any): x is NestedStack {\n    return x != null && typeof(x) === 'object' && NESTED_STACK_SYMBOL in x;\n  }\n\n  public readonly templateFile: string;\n  public readonly nestedStackResource?: CfnResource;\n\n  private readonly parameters: { [name: string]: string };\n  private readonly resource: CfnStack;\n  private readonly _contextualStackId: string;\n  private readonly _contextualStackName: string;\n  private _templateUrl?: string;\n  private _parentStack: Stack;\n\n  constructor(scope: Construct, id: string, props: NestedStackProps = { }) {\n    const parentStack = findParentStack(scope);\n\n    super(scope, id, {\n      env: { account: parentStack.account, region: parentStack.region },\n      synthesizer: new NestedStackSynthesizer(parentStack.synthesizer),\n    });\n\n    this._parentStack = parentStack;\n\n    // @deprecate: remove this in v2.0 (redundent)\n    const parentScope = new CoreConstruct(scope, id + '.NestedStack');\n\n    Object.defineProperty(this, NESTED_STACK_SYMBOL, { value: true });\n\n    // this is the file name of the synthesized template file within the cloud assembly\n    this.templateFile = `${this.node.uniqueId}.nested.template.json`;\n\n    this.parameters = props.parameters || {};\n\n    this.resource = new CfnStack(parentScope, `${id}.NestedStackResource`, {\n      templateUrl: Lazy.stringValue({ produce: () => this._templateUrl || '<unresolved>' }),\n      parameters: Lazy.anyValue({ produce: () => Object.keys(this.parameters).length > 0 ? this.parameters : undefined }),\n      notificationArns: props.notificationArns,\n      timeoutInMinutes: props.timeout ? props.timeout.toMinutes() : undefined,\n    });\n\n    this.nestedStackResource = this.resource;\n\n    // context-aware stack name: if resolved from within this stack, return AWS::StackName\n    // if resolved from the outer stack, use the { Ref } of the AWS::CloudFormation::Stack resource\n    // which resolves the ARN of the stack. We need to extract the stack name, which is the second\n    // component after splitting by \"/\"\n    this._contextualStackName = this.contextualAttribute(Aws.STACK_NAME, Fn.select(1, Fn.split('/', this.resource.ref)));\n    this._contextualStackId = this.contextualAttribute(Aws.STACK_ID, this.resource.ref);\n  }\n\n                                                                                                                                                                                                                                                                                                                                                                                                                                 \n  public get stackName() {\n    return this._contextualStackName;\n  }\n\n                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                \n  public get stackId() {\n    return this._contextualStackId;\n  }\n\n                                                                                                                                                     \n  public setParameter(name: string, value: string) {\n    this.parameters[name] = value;\n  }\n\n  /**\n   * Defines an asset at the parent stack which represents the template of this\n   * nested stack.\n   *\n   * This private API is used by `App.prepare()` within a loop that rectifies\n   * references every time an asset is added. This is because (at the moment)\n   * assets are addressed using CloudFormation parameters.\n   *\n   * @returns `true` if a new asset was added or `false` if an asset was\n   * previously added. When this returns `true`, App will do another reference\n   * rectification cycle.\n   *\n   * @internal\n   */\n  public _prepareTemplateAsset() {\n    if (this._templateUrl) {\n      return false;\n    }\n\n    const cfn = JSON.stringify(this._toCloudFormation());\n    const templateHash = crypto.createHash('sha256').update(cfn).digest('hex');\n\n    const templateLocation = this._parentStack.addFileAsset({\n      packaging: FileAssetPackaging.FILE,\n      sourceHash: templateHash,\n      fileName: this.templateFile,\n    });\n\n    // if bucketName/objectKey are cfn parameters from a stack other than the parent stack, they will\n    // be resolved as cross-stack references like any other (see \"multi\" tests).\n    this._templateUrl = `https://s3.${this._parentStack.region}.${this._parentStack.urlSuffix}/${templateLocation.bucketName}/${templateLocation.objectKey}`;\n    return true;\n  }\n\n  private contextualAttribute(innerValue: string, outerValue: string) {\n    return Token.asString({\n      resolve: (context: IResolveContext) => {\n        if (Stack.of(context.scope) === this) {\n          return innerValue;\n        } else {\n          return outerValue;\n        }\n      },\n    });\n  }\n}\n\n/**\n * Validates the scope for a nested stack. Nested stacks must be defined within the scope of another `Stack`.\n */\nfunction findParentStack(scope: Construct): Stack {\n  if (!scope) {\n    throw new Error('Nested stacks cannot be defined as a root construct');\n  }\n\n  const parentStack = Node.of(scope).scopes.reverse().find(p => Stack.isStack(p));\n  if (!parentStack) {\n    throw new Error('Nested stacks must be defined within scope of another non-nested stack');\n  }\n\n  return parentStack as Stack;\n}\n"]}