@aws-cdk/aws-lambda
Version:
The CDK Construct Library for AWS::Lambda
197 lines • 28.4 kB
JavaScript
"use strict";
var _a;
Object.defineProperty(exports, "__esModule", { value: true });
exports.Alias = void 0;
const jsiiDeprecationWarnings = require("../.warnings.jsii.js");
const JSII_RTTI_SYMBOL_1 = Symbol.for("jsii.rtti");
const appscaling = require("@aws-cdk/aws-applicationautoscaling");
const iam = require("@aws-cdk/aws-iam");
const core_1 = require("@aws-cdk/core");
const function_base_1 = require("./function-base");
const lambda_version_1 = require("./lambda-version");
const lambda_generated_1 = require("./lambda.generated");
const scalable_function_attribute_1 = require("./private/scalable-function-attribute");
/**
* A new alias to a particular version of a Lambda function.
*/
class Alias extends function_base_1.QualifiedFunctionBase {
constructor(scope, id, props) {
super(scope, id, {
physicalName: props.aliasName,
});
this.canCreatePermissions = true;
try {
jsiiDeprecationWarnings._aws_cdk_aws_lambda_AliasProps(props);
}
catch (error) {
if (process.env.JSII_DEBUG !== "1" && error.name === "DeprecationError") {
Error.captureStackTrace(error, Alias);
}
throw error;
}
this.lambda = props.version.lambda;
this.aliasName = this.physicalName;
this.version = props.version;
this.architecture = this.lambda.architecture;
const alias = new lambda_generated_1.CfnAlias(this, 'Resource', {
name: this.aliasName,
description: props.description,
functionName: this.version.lambda.functionName,
functionVersion: props.version.version,
routingConfig: this.determineRoutingConfig(props),
provisionedConcurrencyConfig: this.determineProvisionedConcurrency(props),
});
// Use a Service Linked Role
// https://docs.aws.amazon.com/autoscaling/application/userguide/application-auto-scaling-service-linked-roles.html
this.scalingRole = iam.Role.fromRoleArn(this, 'ScalingRole', this.stack.formatArn({
service: 'iam',
region: '',
resource: 'role/aws-service-role/lambda.application-autoscaling.amazonaws.com',
resourceName: 'AWSServiceRoleForApplicationAutoScaling_LambdaConcurrency',
}));
this.functionArn = this.getResourceArnAttribute(alias.ref, {
service: 'lambda',
resource: 'function',
resourceName: `${this.lambda.functionName}:${this.physicalName}`,
arnFormat: core_1.ArnFormat.COLON_RESOURCE_NAME,
});
this.qualifier = lambda_version_1.extractQualifierFromArn(alias.ref);
if (props.onFailure || props.onSuccess || props.maxEventAge || props.retryAttempts !== undefined) {
this.configureAsyncInvoke({
onFailure: props.onFailure,
onSuccess: props.onSuccess,
maxEventAge: props.maxEventAge,
retryAttempts: props.retryAttempts,
});
}
// ARN parsing splits on `:`, so we can only get the function's name from the ARN as resourceName...
// And we're parsing it out (instead of using the underlying function directly) in order to have use of it incur
// an implicit dependency on the resource.
this.functionName = `${this.stack.splitArn(this.functionArn, core_1.ArnFormat.COLON_RESOURCE_NAME).resourceName}:${this.aliasName}`;
}
static fromAliasAttributes(scope, id, attrs) {
try {
jsiiDeprecationWarnings._aws_cdk_aws_lambda_AliasAttributes(attrs);
}
catch (error) {
if (process.env.JSII_DEBUG !== "1" && error.name === "DeprecationError") {
Error.captureStackTrace(error, this.fromAliasAttributes);
}
throw error;
}
class Imported extends function_base_1.QualifiedFunctionBase {
constructor() {
super(...arguments);
this.aliasName = attrs.aliasName;
this.version = attrs.aliasVersion;
this.lambda = attrs.aliasVersion.lambda;
this.functionArn = `${attrs.aliasVersion.lambda.functionArn}:${attrs.aliasName}`;
this.functionName = `${attrs.aliasVersion.lambda.functionName}:${attrs.aliasName}`;
this.grantPrincipal = attrs.aliasVersion.grantPrincipal;
this.role = attrs.aliasVersion.role;
this.architecture = attrs.aliasVersion.lambda.architecture;
this.canCreatePermissions = this._isStackAccount();
this.qualifier = attrs.aliasName;
}
}
return new Imported(scope, id);
}
get grantPrincipal() {
return this.version.grantPrincipal;
}
get role() {
return this.version.role;
}
metric(metricName, props = {}) {
// Metrics on Aliases need the "bare" function name, and the alias' ARN, this differs from the base behavior.
return super.metric(metricName, {
dimensionsMap: {
FunctionName: this.lambda.functionName,
// construct the name from the underlying lambda so that alarms on an alias
// don't cause a circular dependency with CodeDeploy
// see: https://github.com/aws/aws-cdk/issues/2231
Resource: `${this.lambda.functionName}:${this.aliasName}`,
},
...props,
});
}
/**
* Configure provisioned concurrency autoscaling on a function alias. Returns a scalable attribute that can call
* `scaleOnUtilization()` and `scaleOnSchedule()`.
*
* @param options Autoscaling options
*/
addAutoScaling(options) {
try {
jsiiDeprecationWarnings._aws_cdk_aws_lambda_AutoScalingOptions(options);
}
catch (error) {
if (process.env.JSII_DEBUG !== "1" && error.name === "DeprecationError") {
Error.captureStackTrace(error, this.addAutoScaling);
}
throw error;
}
if (this.scalableAlias) {
throw new Error('AutoScaling already enabled for this alias');
}
return this.scalableAlias = new scalable_function_attribute_1.ScalableFunctionAttribute(this, 'AliasScaling', {
minCapacity: options.minCapacity ?? 1,
maxCapacity: options.maxCapacity,
resourceId: `function:${this.functionName}`,
dimension: 'lambda:function:ProvisionedConcurrency',
serviceNamespace: appscaling.ServiceNamespace.LAMBDA,
role: this.scalingRole,
});
}
/**
* Calculate the routingConfig parameter from the input props
*/
determineRoutingConfig(props) {
if (!props.additionalVersions || props.additionalVersions.length === 0) {
return undefined;
}
this.validateAdditionalWeights(props.additionalVersions);
return {
additionalVersionWeights: props.additionalVersions.map(vw => {
return {
functionVersion: vw.version.version,
functionWeight: vw.weight,
};
}),
};
}
/**
* Validate that the additional version weights make sense
*
* We validate that they are positive and add up to something <= 1.
*/
validateAdditionalWeights(weights) {
const total = weights.map(w => {
if (w.weight < 0 || w.weight > 1) {
throw new Error(`Additional version weight must be between 0 and 1, got: ${w.weight}`);
}
return w.weight;
}).reduce((a, x) => a + x);
if (total > 1) {
throw new Error(`Sum of additional version weights must not exceed 1, got: ${total}`);
}
}
/**
* Validate that the provisionedConcurrentExecutions makes sense
*
* Member must have value greater than or equal to 1
*/
determineProvisionedConcurrency(props) {
if (!props.provisionedConcurrentExecutions) {
return undefined;
}
if (props.provisionedConcurrentExecutions <= 0) {
throw new Error('provisionedConcurrentExecutions must have value greater than or equal to 1');
}
return { provisionedConcurrentExecutions: props.provisionedConcurrentExecutions };
}
}
exports.Alias = Alias;
_a = JSII_RTTI_SYMBOL_1;
Alias[_a] = { fqn: "@aws-cdk/aws-lambda.Alias", version: "1.204.0" };
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* as appscaling from '@aws-cdk/aws-applicationautoscaling';\nimport * as cloudwatch from '@aws-cdk/aws-cloudwatch';\nimport * as iam from '@aws-cdk/aws-iam';\nimport { ArnFormat } from '@aws-cdk/core';\nimport { Construct } from 'constructs';\nimport { Architecture } from './architecture';\nimport { EventInvokeConfigOptions } from './event-invoke-config';\nimport { IFunction, QualifiedFunctionBase } from './function-base';\nimport { extractQualifierFromArn, IVersion } from './lambda-version';\nimport { CfnAlias } from './lambda.generated';\nimport { ScalableFunctionAttribute } from './private/scalable-function-attribute';\nimport { AutoScalingOptions, IScalableFunctionAttribute } from './scalable-attribute-api';\n\nexport interface IAlias extends IFunction {\n  /**\n   * Name of this alias.\n   *\n   * @attribute\n   */\n  readonly aliasName: string;\n\n  /**\n   * The underlying Lambda function version.\n   */\n  readonly version: IVersion;\n}\n\n/**\n * Options for `lambda.Alias`.\n */\nexport interface AliasOptions extends EventInvokeConfigOptions {\n  /**\n   * Description for the alias\n   *\n   * @default No description\n   */\n  readonly description?: string;\n\n  /**\n   * Additional versions with individual weights this alias points to\n   *\n   * Individual additional version weights specified here should add up to\n   * (less than) one. All remaining weight is routed to the default\n   * version.\n   *\n   * For example, the config is\n   *\n   *    version: \"1\"\n   *    additionalVersions: [{ version: \"2\", weight: 0.05 }]\n   *\n   * Then 5% of traffic will be routed to function version 2, while\n   * the remaining 95% of traffic will be routed to function version 1.\n   *\n   * @default No additional versions\n   */\n  readonly additionalVersions?: VersionWeight[];\n\n  /**\n   * Specifies a provisioned concurrency configuration for a function's alias.\n   *\n   * @default No provisioned concurrency\n   */\n  readonly provisionedConcurrentExecutions?: number;\n}\n\n/**\n * Properties for a new Lambda alias\n */\nexport interface AliasProps extends AliasOptions {\n  /**\n   * Name of this alias\n   */\n  readonly aliasName: string;\n\n  /**\n   * Function version this alias refers to\n   *\n   * Use lambda.currentVersion to reference a version with your latest changes.\n   */\n  readonly version: IVersion;\n}\n\nexport interface AliasAttributes {\n  readonly aliasName: string;\n  readonly aliasVersion: IVersion;\n}\n\n/**\n * A new alias to a particular version of a Lambda function.\n */\nexport class Alias extends QualifiedFunctionBase implements IAlias {\n  public static fromAliasAttributes(scope: Construct, id: string, attrs: AliasAttributes): IAlias {\n    class Imported extends QualifiedFunctionBase implements IAlias {\n      public readonly aliasName = attrs.aliasName;\n      public readonly version = attrs.aliasVersion;\n      public readonly lambda = attrs.aliasVersion.lambda;\n      public readonly functionArn = `${attrs.aliasVersion.lambda.functionArn}:${attrs.aliasName}`;\n      public readonly functionName = `${attrs.aliasVersion.lambda.functionName}:${attrs.aliasName}`;\n      public readonly grantPrincipal = attrs.aliasVersion.grantPrincipal;\n      public readonly role = attrs.aliasVersion.role;\n      public readonly architecture = attrs.aliasVersion.lambda.architecture;\n\n      protected readonly canCreatePermissions = this._isStackAccount();\n      protected readonly qualifier = attrs.aliasName;\n    }\n    return new Imported(scope, id);\n  }\n\n  /**\n   * Name of this alias.\n   *\n   * @attribute\n   */\n  public readonly aliasName: string;\n  /**\n   * ARN of this alias\n   *\n   * Used to be able to use Alias in place of a regular Lambda. Lambda accepts\n   * ARNs everywhere it accepts function names.\n   */\n  public readonly functionName: string;\n\n  public readonly lambda: IFunction;\n\n  public readonly architecture: Architecture;\n\n  public readonly version: IVersion;\n\n  /**\n   * ARN of this alias\n   *\n   * Used to be able to use Alias in place of a regular Lambda. Lambda accepts\n   * ARNs everywhere it accepts function names.\n   */\n  public readonly functionArn: string;\n\n  protected readonly qualifier: string;\n\n  protected readonly canCreatePermissions: boolean = true;\n\n  private scalableAlias?: ScalableFunctionAttribute;\n  private readonly scalingRole: iam.IRole;\n\n  constructor(scope: Construct, id: string, props: AliasProps) {\n    super(scope, id, {\n      physicalName: props.aliasName,\n    });\n\n    this.lambda = props.version.lambda;\n    this.aliasName = this.physicalName;\n    this.version = props.version;\n    this.architecture = this.lambda.architecture;\n\n    const alias = new CfnAlias(this, 'Resource', {\n      name: this.aliasName,\n      description: props.description,\n      functionName: this.version.lambda.functionName,\n      functionVersion: props.version.version,\n      routingConfig: this.determineRoutingConfig(props),\n      provisionedConcurrencyConfig: this.determineProvisionedConcurrency(props),\n    });\n\n    // Use a Service Linked Role\n    // https://docs.aws.amazon.com/autoscaling/application/userguide/application-auto-scaling-service-linked-roles.html\n    this.scalingRole = iam.Role.fromRoleArn(this, 'ScalingRole', this.stack.formatArn({\n      service: 'iam',\n      region: '',\n      resource: 'role/aws-service-role/lambda.application-autoscaling.amazonaws.com',\n      resourceName: 'AWSServiceRoleForApplicationAutoScaling_LambdaConcurrency',\n    }));\n\n    this.functionArn = this.getResourceArnAttribute(alias.ref, {\n      service: 'lambda',\n      resource: 'function',\n      resourceName: `${this.lambda.functionName}:${this.physicalName}`,\n      arnFormat: ArnFormat.COLON_RESOURCE_NAME,\n    });\n\n    this.qualifier = extractQualifierFromArn(alias.ref);\n\n    if (props.onFailure || props.onSuccess || props.maxEventAge || props.retryAttempts !== undefined) {\n      this.configureAsyncInvoke({\n        onFailure: props.onFailure,\n        onSuccess: props.onSuccess,\n        maxEventAge: props.maxEventAge,\n        retryAttempts: props.retryAttempts,\n      });\n    }\n\n    // ARN parsing splits on `:`, so we can only get the function's name from the ARN as resourceName...\n    // And we're parsing it out (instead of using the underlying function directly) in order to have use of it incur\n    // an implicit dependency on the resource.\n    this.functionName = `${this.stack.splitArn(this.functionArn, ArnFormat.COLON_RESOURCE_NAME).resourceName!}:${this.aliasName}`;\n  }\n\n  public get grantPrincipal() {\n    return this.version.grantPrincipal;\n  }\n\n  public get role() {\n    return this.version.role;\n  }\n\n  public metric(metricName: string, props: cloudwatch.MetricOptions = {}): cloudwatch.Metric {\n    // Metrics on Aliases need the \"bare\" function name, and the alias' ARN, this differs from the base behavior.\n    return super.metric(metricName, {\n      dimensionsMap: {\n        FunctionName: this.lambda.functionName,\n        // construct the name from the underlying lambda so that alarms on an alias\n        // don't cause a circular dependency with CodeDeploy\n        // see: https://github.com/aws/aws-cdk/issues/2231\n        Resource: `${this.lambda.functionName}:${this.aliasName}`,\n      },\n      ...props,\n    });\n  }\n\n  /**\n   * Configure provisioned concurrency autoscaling on a function alias. Returns a scalable attribute that can call\n   * `scaleOnUtilization()` and `scaleOnSchedule()`.\n   *\n   * @param options Autoscaling options\n   */\n  public addAutoScaling(options: AutoScalingOptions): IScalableFunctionAttribute {\n    if (this.scalableAlias) {\n      throw new Error('AutoScaling already enabled for this alias');\n    }\n    return this.scalableAlias = new ScalableFunctionAttribute(this, 'AliasScaling', {\n      minCapacity: options.minCapacity ?? 1,\n      maxCapacity: options.maxCapacity,\n      resourceId: `function:${this.functionName}`,\n      dimension: 'lambda:function:ProvisionedConcurrency',\n      serviceNamespace: appscaling.ServiceNamespace.LAMBDA,\n      role: this.scalingRole,\n    });\n  }\n\n  /**\n   * Calculate the routingConfig parameter from the input props\n   */\n  private determineRoutingConfig(props: AliasProps) {\n    if (!props.additionalVersions || props.additionalVersions.length === 0) {\n      return undefined;\n    }\n\n    this.validateAdditionalWeights(props.additionalVersions);\n\n    return {\n      additionalVersionWeights: props.additionalVersions.map(vw => {\n        return {\n          functionVersion: vw.version.version,\n          functionWeight: vw.weight,\n        };\n      }),\n    };\n  }\n\n  /**\n   * Validate that the additional version weights make sense\n   *\n   * We validate that they are positive and add up to something <= 1.\n   */\n  private validateAdditionalWeights(weights: VersionWeight[]) {\n    const total = weights.map(w => {\n      if (w.weight < 0 || w.weight > 1) { throw new Error(`Additional version weight must be between 0 and 1, got: ${w.weight}`); }\n      return w.weight;\n    }).reduce((a, x) => a + x);\n\n    if (total > 1) {\n      throw new Error(`Sum of additional version weights must not exceed 1, got: ${total}`);\n    }\n  }\n\n  /**\n   * Validate that the provisionedConcurrentExecutions makes sense\n   *\n   * Member must have value greater than or equal to 1\n   */\n  private determineProvisionedConcurrency(props: AliasProps): CfnAlias.ProvisionedConcurrencyConfigurationProperty | undefined {\n    if (!props.provisionedConcurrentExecutions) {\n      return undefined;\n    }\n\n    if (props.provisionedConcurrentExecutions <= 0) {\n      throw new Error('provisionedConcurrentExecutions must have value greater than or equal to 1');\n    }\n\n    return { provisionedConcurrentExecutions: props.provisionedConcurrentExecutions };\n  }\n}\n\n/**\n * A version/weight pair for routing traffic to Lambda functions\n */\nexport interface VersionWeight {\n  /**\n   * The version to route traffic to\n   */\n  readonly version: IVersion;\n\n  /**\n   * How much weight to assign to this version (0..1)\n   */\n  readonly weight: number;\n}\n"]}