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@aws-cdk/cloudformation-diff

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Utilities to diff CDK stacks against CloudFormation templates

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"use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports.TemplateAndChangeSetDiffMerger = void 0; const types = require("../diff/types"); /** * The purpose of this class is to include differences from the ChangeSet to differences in the TemplateDiff. */ class TemplateAndChangeSetDiffMerger { static determineChangeSetReplacementMode(propertyChange) { if (propertyChange.Target?.RequiresRecreation === undefined) { // We can't determine if the resource will be replaced or not. That's what conditionally means. return 'Conditionally'; } if (propertyChange.Target.RequiresRecreation === 'Always') { switch (propertyChange.Evaluation) { case 'Static': return 'Always'; case 'Dynamic': // If Evaluation is 'Dynamic', then this may cause replacement, or it may not. // see 'Replacement': https://docs.aws.amazon.com/AWSCloudFormation/latest/APIReference/API_ResourceChange.html return 'Conditionally'; } } return propertyChange.Target.RequiresRecreation; } constructor(props) { this.changeSet = props.changeSet; this.changeSetResources = props.changeSetResources ?? this.convertDescribeChangeSetOutputToChangeSetResources(this.changeSet); } /** * Read resources from the changeSet, extracting information into ChangeSetResources. */ convertDescribeChangeSetOutputToChangeSetResources(changeSet) { const changeSetResources = {}; for (const resourceChange of changeSet.Changes ?? []) { if (resourceChange.ResourceChange?.LogicalResourceId === undefined) { continue; // Being defensive, here. } const propertyReplacementModes = {}; for (const propertyChange of resourceChange.ResourceChange.Details ?? []) { // Details is only included if resourceChange.Action === 'Modify' if (propertyChange.Target?.Attribute === 'Properties' && propertyChange.Target.Name) { propertyReplacementModes[propertyChange.Target.Name] = { replacementMode: TemplateAndChangeSetDiffMerger.determineChangeSetReplacementMode(propertyChange), }; } } changeSetResources[resourceChange.ResourceChange.LogicalResourceId] = { resourceWasReplaced: resourceChange.ResourceChange.Replacement === 'True', resourceType: resourceChange.ResourceChange.ResourceType ?? TemplateAndChangeSetDiffMerger.UNKNOWN_RESOURCE_TYPE, // DescribeChangeSet doesn't promise to have the ResourceType... propertyReplacementModes: propertyReplacementModes, }; } return changeSetResources; } /** * This is writing over the "ChangeImpact" that was computed from the template difference, and instead using the ChangeImpact that is included from the ChangeSet. * Using the ChangeSet ChangeImpact is more accurate. The ChangeImpact tells us what the consequence is of changing the field. If changing the field causes resource * replacement (e.g., changing the name of an IAM role requires deleting and replacing the role), then ChangeImpact is "Always". */ overrideDiffResourceChangeImpactWithChangeSetChangeImpact(logicalId, change) { // resourceType getter throws an error if resourceTypeChanged if ((change.resourceTypeChanged === true) || change.resourceType?.includes('AWS::Serverless')) { // CFN applies the SAM transform before creating the changeset, so the changeset contains no information about SAM resources return; } change.forEachDifference((type, name, value) => { if (type === 'Property') { if (!this.changeSetResources[logicalId]) { value.changeImpact = types.ResourceImpact.NO_CHANGE; value.isDifferent = false; return; } const changingPropertyCausesResourceReplacement = (this.changeSetResources[logicalId].propertyReplacementModes ?? {})[name]?.replacementMode; switch (changingPropertyCausesResourceReplacement) { case 'Always': value.changeImpact = types.ResourceImpact.WILL_REPLACE; break; case 'Never': value.changeImpact = types.ResourceImpact.WILL_UPDATE; break; case 'Conditionally': value.changeImpact = types.ResourceImpact.MAY_REPLACE; break; case undefined: value.changeImpact = types.ResourceImpact.NO_CHANGE; value.isDifferent = false; break; // otherwise, defer to the changeImpact from the template diff } } else if (type === 'Other') { switch (name) { case 'Metadata': // we want to ignore metadata changes in the diff, so compare newValue against newValue. change.setOtherChange('Metadata', new types.Difference(value.newValue, value.newValue)); break; } } }); } addImportInformationFromChangeset(resourceDiffs) { const imports = this.findResourceImports(); resourceDiffs.forEachDifference((logicalId, change) => { if (imports.includes(logicalId)) { change.isImport = true; } }); } findResourceImports() { const importedResourceLogicalIds = []; for (const resourceChange of this.changeSet?.Changes ?? []) { if (resourceChange.ResourceChange?.Action === 'Import') { importedResourceLogicalIds.push(resourceChange.ResourceChange.LogicalResourceId); } } return importedResourceLogicalIds; } } exports.TemplateAndChangeSetDiffMerger = TemplateAndChangeSetDiffMerger; // If we somehow cannot find the resourceType, then we'll mark it as UNKNOWN, so that can be seen in the diff. 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Otherwise, this is the datastructure that the changeSet is converted into so\n   * that we only pay attention to the subset of changeSet properties that are relevant for computing the diff.\n   *\n   * @default - the changeSet is converted into this datastructure.\n  */\n  readonly changeSetResources?: types.ChangeSetResources;\n}\n\nexport interface TemplateAndChangeSetDiffMergerProps extends TemplateAndChangeSetDiffMergerOptions {\n  /*\n   * The changeset that will be read and merged into the template diff.\n  */\n  readonly changeSet: DescribeChangeSetOutput;\n}\n\n/**\n * The purpose of this class is to include differences from the ChangeSet to differences in the TemplateDiff.\n */\nexport class TemplateAndChangeSetDiffMerger {\n  public static determineChangeSetReplacementMode(propertyChange: ChangeSetResourceChangeDetail): types.ReplacementModes {\n    if (propertyChange.Target?.RequiresRecreation === undefined) {\n      // We can't determine if the resource will be replaced or not. That's what conditionally means.\n      return 'Conditionally';\n    }\n\n    if (propertyChange.Target.RequiresRecreation === 'Always') {\n      switch (propertyChange.Evaluation) {\n        case 'Static':\n          return 'Always';\n        case 'Dynamic':\n          // If Evaluation is 'Dynamic', then this may cause replacement, or it may not.\n          // see 'Replacement': https://docs.aws.amazon.com/AWSCloudFormation/latest/APIReference/API_ResourceChange.html\n          return 'Conditionally';\n      }\n    }\n\n    return propertyChange.Target.RequiresRecreation as types.ReplacementModes;\n  }\n\n  // If we somehow cannot find the resourceType, then we'll mark it as UNKNOWN, so that can be seen in the diff.\n  private static UNKNOWN_RESOURCE_TYPE = 'UNKNOWN_RESOURCE_TYPE';\n\n  public changeSet: DescribeChangeSetOutput | undefined;\n  public changeSetResources: types.ChangeSetResources;\n\n  constructor(props: TemplateAndChangeSetDiffMergerProps) {\n    this.changeSet = props.changeSet;\n    this.changeSetResources = props.changeSetResources ?? this.convertDescribeChangeSetOutputToChangeSetResources(this.changeSet);\n  }\n\n  /**\n   * Read resources from the changeSet, extracting information into ChangeSetResources.\n   */\n  private convertDescribeChangeSetOutputToChangeSetResources(changeSet: DescribeChangeSetOutput): types.ChangeSetResources {\n    const changeSetResources: types.ChangeSetResources = {};\n    for (const resourceChange of changeSet.Changes ?? []) {\n      if (resourceChange.ResourceChange?.LogicalResourceId === undefined) {\n        continue; // Being defensive, here.\n      }\n\n      const propertyReplacementModes: types.PropertyReplacementModeMap = {};\n      for (const propertyChange of resourceChange.ResourceChange.Details ?? []) { // Details is only included if resourceChange.Action === 'Modify'\n        if (propertyChange.Target?.Attribute === 'Properties' && propertyChange.Target.Name) {\n          propertyReplacementModes[propertyChange.Target.Name] = {\n            replacementMode: TemplateAndChangeSetDiffMerger.determineChangeSetReplacementMode(propertyChange),\n          };\n        }\n      }\n\n      changeSetResources[resourceChange.ResourceChange.LogicalResourceId] = {\n        resourceWasReplaced: resourceChange.ResourceChange.Replacement === 'True',\n        resourceType: resourceChange.ResourceChange.ResourceType ?? TemplateAndChangeSetDiffMerger.UNKNOWN_RESOURCE_TYPE, // DescribeChangeSet doesn't promise to have the ResourceType...\n        propertyReplacementModes: propertyReplacementModes,\n      };\n    }\n\n    return changeSetResources;\n  }\n\n  /**\n   * This is writing over the \"ChangeImpact\" that was computed from the template difference, and instead using the ChangeImpact that is included from the ChangeSet.\n   * Using the ChangeSet ChangeImpact is more accurate. The ChangeImpact tells us what the consequence is of changing the field. If changing the field causes resource\n   * replacement (e.g., changing the name of an IAM role requires deleting and replacing the role), then ChangeImpact is \"Always\".\n   */\n  public overrideDiffResourceChangeImpactWithChangeSetChangeImpact(logicalId: string, change: types.ResourceDifference) {\n    // resourceType getter throws an error if resourceTypeChanged\n    if ((change.resourceTypeChanged === true) || change.resourceType?.includes('AWS::Serverless')) {\n      // CFN applies the SAM transform before creating the changeset, so the changeset contains no information about SAM resources\n      return;\n    }\n    change.forEachDifference((type: 'Property' | 'Other', name: string, value: types.Difference<any> | types.PropertyDifference<any>) => {\n      if (type === 'Property') {\n        if (!this.changeSetResources[logicalId]) {\n          (value as types.PropertyDifference<any>).changeImpact = types.ResourceImpact.NO_CHANGE;\n          (value as types.PropertyDifference<any>).isDifferent = false;\n          return;\n        }\n\n        const changingPropertyCausesResourceReplacement = (this.changeSetResources[logicalId].propertyReplacementModes ?? {})[name]?.replacementMode;\n        switch (changingPropertyCausesResourceReplacement) {\n          case 'Always':\n            (value as types.PropertyDifference<any>).changeImpact = types.ResourceImpact.WILL_REPLACE;\n            break;\n          case 'Never':\n            (value as types.PropertyDifference<any>).changeImpact = types.ResourceImpact.WILL_UPDATE;\n            break;\n          case 'Conditionally':\n            (value as types.PropertyDifference<any>).changeImpact = types.ResourceImpact.MAY_REPLACE;\n            break;\n          case undefined:\n            (value as types.PropertyDifference<any>).changeImpact = types.ResourceImpact.NO_CHANGE;\n            (value as types.PropertyDifference<any>).isDifferent = false;\n            break;\n          // otherwise, defer to the changeImpact from the template diff\n        }\n      } else if (type === 'Other') {\n        switch (name) {\n          case 'Metadata':\n            // we want to ignore metadata changes in the diff, so compare newValue against newValue.\n            change.setOtherChange('Metadata', new types.Difference<string>(value.newValue, value.newValue));\n            break;\n        }\n      }\n    });\n  }\n\n  public addImportInformationFromChangeset(resourceDiffs: types.DifferenceCollection<types.Resource, types.ResourceDifference>) {\n    const imports = this.findResourceImports();\n    resourceDiffs.forEachDifference((logicalId: string, change: types.ResourceDifference) => {\n      if (imports.includes(logicalId)) {\n        change.isImport = true;\n      }\n    });\n  }\n\n  public findResourceImports(): (string | undefined)[] {\n    const importedResourceLogicalIds = [];\n    for (const resourceChange of this.changeSet?.Changes ?? []) {\n      if (resourceChange.ResourceChange?.Action === 'Import') {\n        importedResourceLogicalIds.push(resourceChange.ResourceChange.LogicalResourceId);\n      }\n    }\n\n    return importedResourceLogicalIds;\n  }\n}\n"]}