@aws-cdk/cloudformation-diff
Version:
Utilities to diff CDK stacks against CloudFormation templates
212 lines • 30.8 kB
JavaScript
;
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __exportStar = (this && this.__exportStar) || function(m, exports) {
for (var p in m) if (p !== "default" && !Object.prototype.hasOwnProperty.call(exports, p)) __createBinding(exports, m, p);
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.fullDiff = fullDiff;
exports.diffTemplate = diffTemplate;
const impl = require("./diff");
const template_and_changeset_diff_merger_1 = require("./diff/template-and-changeset-diff-merger");
const types = require("./diff/types");
const util_1 = require("./diff/util");
__exportStar(require("./diff/types"), exports);
const DIFF_HANDLERS = {
AWSTemplateFormatVersion: (diff, oldValue, newValue) => diff.awsTemplateFormatVersion = impl.diffAttribute(oldValue, newValue),
Description: (diff, oldValue, newValue) => diff.description = impl.diffAttribute(oldValue, newValue),
Metadata: (diff, oldValue, newValue) => diff.metadata = new types.DifferenceCollection((0, util_1.diffKeyedEntities)(oldValue, newValue, impl.diffMetadata)),
Parameters: (diff, oldValue, newValue) => diff.parameters = new types.DifferenceCollection((0, util_1.diffKeyedEntities)(oldValue, newValue, impl.diffParameter)),
Mappings: (diff, oldValue, newValue) => diff.mappings = new types.DifferenceCollection((0, util_1.diffKeyedEntities)(oldValue, newValue, impl.diffMapping)),
Conditions: (diff, oldValue, newValue) => diff.conditions = new types.DifferenceCollection((0, util_1.diffKeyedEntities)(oldValue, newValue, impl.diffCondition)),
Transform: (diff, oldValue, newValue) => diff.transform = impl.diffAttribute(oldValue, newValue),
Resources: (diff, oldValue, newValue) => diff.resources = new types.DifferenceCollection((0, util_1.diffKeyedEntities)(oldValue, newValue, impl.diffResource)),
Outputs: (diff, oldValue, newValue) => diff.outputs = new types.DifferenceCollection((0, util_1.diffKeyedEntities)(oldValue, newValue, impl.diffOutput)),
};
/**
* Compare two CloudFormation templates and return semantic differences between them.
*
* @param currentTemplate - the current state of the stack.
* @param newTemplate - the target state of the stack.
* @param changeSet - the change set for this stack.
*
* @returns a +types.TemplateDiff+ object that represents the changes that will happen if
* a stack which current state is described by +currentTemplate+ is updated with
* the template +newTemplate+.
*/
function fullDiff(currentTemplate, newTemplate, changeSet, isImport) {
normalize(currentTemplate);
normalize(newTemplate);
const theDiff = diffTemplate(currentTemplate, newTemplate);
if (changeSet) {
// These methods mutate the state of theDiff, using the changeSet.
const changeSetDiff = new template_and_changeset_diff_merger_1.TemplateAndChangeSetDiffMerger({ changeSet });
theDiff.resources.forEachDifference((logicalId, change) => changeSetDiff.overrideDiffResourceChangeImpactWithChangeSetChangeImpact(logicalId, change));
changeSetDiff.addImportInformationFromChangeset(theDiff.resources);
}
else if (isImport) {
makeAllResourceChangesImports(theDiff);
}
return theDiff;
}
function diffTemplate(currentTemplate, newTemplate) {
// Base diff
const theDiff = calculateTemplateDiff(currentTemplate, newTemplate);
// We're going to modify this in-place
const newTemplateCopy = deepCopy(newTemplate);
let didPropagateReferenceChanges;
let diffWithReplacements;
do {
diffWithReplacements = calculateTemplateDiff(currentTemplate, newTemplateCopy);
// Propagate replacements for replaced resources
didPropagateReferenceChanges = false;
if (diffWithReplacements.resources) {
diffWithReplacements.resources.forEachDifference((logicalId, change) => {
if (change.changeImpact === types.ResourceImpact.WILL_REPLACE) {
if (propagateReplacedReferences(newTemplateCopy, logicalId)) {
didPropagateReferenceChanges = true;
}
}
});
}
} while (didPropagateReferenceChanges);
// Copy "replaced" states from `diffWithReplacements` to `theDiff`.
diffWithReplacements.resources
.filter(r => isReplacement(r.changeImpact))
.forEachDifference((logicalId, downstreamReplacement) => {
const resource = theDiff.resources.get(logicalId);
if (resource.changeImpact !== downstreamReplacement.changeImpact) {
propagatePropertyReplacement(downstreamReplacement, resource);
}
});
return theDiff;
}
function isReplacement(impact) {
return impact === types.ResourceImpact.MAY_REPLACE || impact === types.ResourceImpact.WILL_REPLACE;
}
/**
* For all properties in 'source' that have a "replacement" impact, propagate that impact to "dest"
*/
function propagatePropertyReplacement(source, dest) {
for (const [propertyName, diff] of Object.entries(source.propertyUpdates)) {
if (diff.changeImpact && isReplacement(diff.changeImpact)) {
// Use the propertydiff of source in target. The result of this happens to be clear enough.
dest.setPropertyChange(propertyName, diff);
}
}
}
function calculateTemplateDiff(currentTemplate, newTemplate) {
const differences = {};
const unknown = {};
for (const key of (0, util_1.unionOf)(Object.keys(currentTemplate), Object.keys(newTemplate)).sort()) {
const oldValue = currentTemplate[key];
const newValue = newTemplate[key];
if ((0, util_1.deepEqual)(oldValue, newValue)) {
continue;
}
const handler = DIFF_HANDLERS[key]
|| ((_diff, oldV, newV) => unknown[key] = impl.diffUnknown(oldV, newV));
handler(differences, oldValue, newValue);
}
if (Object.keys(unknown).length > 0) {
differences.unknown = new types.DifferenceCollection(unknown);
}
return new types.TemplateDiff(differences);
}
/**
* Replace all references to the given logicalID on the given template, in-place
*
* Returns true if any references were replaced.
*/
function propagateReplacedReferences(template, logicalId) {
let ret = false;
function recurse(obj) {
if (Array.isArray(obj)) {
obj.forEach(recurse);
}
if (typeof obj === 'object' && obj !== null) {
if (!replaceReference(obj)) {
Object.values(obj).forEach(recurse);
}
}
}
function replaceReference(obj) {
const keys = Object.keys(obj);
if (keys.length !== 1) {
return false;
}
const key = keys[0];
if (key === 'Ref') {
if (obj.Ref === logicalId) {
obj.Ref = logicalId + ' (replaced)';
ret = true;
}
return true;
}
if (key.startsWith('Fn::')) {
if (Array.isArray(obj[key]) && obj[key].length > 0 && obj[key][0] === logicalId) {
obj[key][0] = logicalId + '(replaced)';
ret = true;
}
return true;
}
return false;
}
recurse(template);
return ret;
}
function deepCopy(x) {
if (Array.isArray(x)) {
return x.map(deepCopy);
}
if (typeof x === 'object' && x !== null) {
const ret = {};
for (const key of Object.keys(x)) {
ret[key] = deepCopy(x[key]);
}
return ret;
}
return x;
}
function makeAllResourceChangesImports(diff) {
diff.resources.forEachDifference((_logicalId, change) => {
change.isImport = true;
});
}
function normalize(template) {
if (typeof template === 'object') {
for (const key of (Object.keys(template ?? {}))) {
if (key === 'Fn::GetAtt' && typeof template[key] === 'string') {
template[key] = template[key].split('.');
continue;
}
else if (key === 'DependsOn') {
if (typeof template[key] === 'string') {
template[key] = [template[key]];
}
else if (Array.isArray(template[key])) {
template[key] = template[key].sort();
}
continue;
}
if (Array.isArray(template[key])) {
for (const element of (template[key])) {
normalize(element);
}
}
else {
normalize(template[key]);
}
}
}
}
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The SDK is only used to reference `DescribeChangeSetOutput`, so the SDK is added as a devDependency.\n// The SDK should not make network calls here\nimport type { DescribeChangeSetOutput as DescribeChangeSet } from '@aws-sdk/client-cloudformation';\nimport * as impl from './diff';\nimport { TemplateAndChangeSetDiffMerger } from './diff/template-and-changeset-diff-merger';\nimport * as types from './diff/types';\nimport { deepEqual, diffKeyedEntities, unionOf } from './diff/util';\n\nexport * from './diff/types';\n\nexport type DescribeChangeSetOutput = DescribeChangeSet;\n\ntype DiffHandler = (diff: types.ITemplateDiff, oldValue: any, newValue: any) => void;\ntype HandlerRegistry = { [section: string]: DiffHandler };\n\nconst DIFF_HANDLERS: HandlerRegistry = {\n  AWSTemplateFormatVersion: (diff, oldValue, newValue) =>\n    diff.awsTemplateFormatVersion = impl.diffAttribute(oldValue, newValue),\n  Description: (diff, oldValue, newValue) =>\n    diff.description = impl.diffAttribute(oldValue, newValue),\n  Metadata: (diff, oldValue, newValue) =>\n    diff.metadata = new types.DifferenceCollection(diffKeyedEntities(oldValue, newValue, impl.diffMetadata)),\n  Parameters: (diff, oldValue, newValue) =>\n    diff.parameters = new types.DifferenceCollection(diffKeyedEntities(oldValue, newValue, impl.diffParameter)),\n  Mappings: (diff, oldValue, newValue) =>\n    diff.mappings = new types.DifferenceCollection(diffKeyedEntities(oldValue, newValue, impl.diffMapping)),\n  Conditions: (diff, oldValue, newValue) =>\n    diff.conditions = new types.DifferenceCollection(diffKeyedEntities(oldValue, newValue, impl.diffCondition)),\n  Transform: (diff, oldValue, newValue) =>\n    diff.transform = impl.diffAttribute(oldValue, newValue),\n  Resources: (diff, oldValue, newValue) =>\n    diff.resources = new types.DifferenceCollection(diffKeyedEntities(oldValue, newValue, impl.diffResource)),\n  Outputs: (diff, oldValue, newValue) =>\n    diff.outputs = new types.DifferenceCollection(diffKeyedEntities(oldValue, newValue, impl.diffOutput)),\n};\n\n/**\n * Compare two CloudFormation templates and return semantic differences between them.\n *\n * @param currentTemplate - the current state of the stack.\n * @param newTemplate     - the target state of the stack.\n * @param changeSet       - the change set for this stack.\n *\n * @returns a +types.TemplateDiff+ object that represents the changes that will happen if\n *      a stack which current state is described by +currentTemplate+ is updated with\n *      the template +newTemplate+.\n */\nexport function fullDiff(\n  currentTemplate: { [key: string]: any },\n  newTemplate: { [key: string]: any },\n  changeSet?: DescribeChangeSetOutput,\n  isImport?: boolean,\n): types.TemplateDiff {\n  normalize(currentTemplate);\n  normalize(newTemplate);\n  const theDiff = diffTemplate(currentTemplate, newTemplate);\n  if (changeSet) {\n    // These methods mutate the state of theDiff, using the changeSet.\n    const changeSetDiff = new TemplateAndChangeSetDiffMerger({ changeSet });\n    theDiff.resources.forEachDifference((logicalId: string, change: types.ResourceDifference) =>\n      changeSetDiff.overrideDiffResourceChangeImpactWithChangeSetChangeImpact(logicalId, change),\n    );\n    changeSetDiff.addImportInformationFromChangeset(theDiff.resources);\n  } else if (isImport) {\n    makeAllResourceChangesImports(theDiff);\n  }\n\n  return theDiff;\n}\n\nexport function diffTemplate(\n  currentTemplate: { [key: string]: any },\n  newTemplate: { [key: string]: any },\n): types.TemplateDiff {\n  // Base diff\n  const theDiff = calculateTemplateDiff(currentTemplate, newTemplate);\n\n  // We're going to modify this in-place\n  const newTemplateCopy = deepCopy(newTemplate);\n\n  let didPropagateReferenceChanges;\n  let diffWithReplacements;\n  do {\n    diffWithReplacements = calculateTemplateDiff(currentTemplate, newTemplateCopy);\n\n    // Propagate replacements for replaced resources\n    didPropagateReferenceChanges = false;\n    if (diffWithReplacements.resources) {\n      diffWithReplacements.resources.forEachDifference((logicalId, change) => {\n        if (change.changeImpact === types.ResourceImpact.WILL_REPLACE) {\n          if (propagateReplacedReferences(newTemplateCopy, logicalId)) {\n            didPropagateReferenceChanges = true;\n          }\n        }\n      });\n    }\n  } while (didPropagateReferenceChanges);\n\n  // Copy \"replaced\" states from `diffWithReplacements` to `theDiff`.\n  diffWithReplacements.resources\n    .filter(r => isReplacement(r!.changeImpact))\n    .forEachDifference((logicalId, downstreamReplacement) => {\n      const resource = theDiff.resources.get(logicalId);\n\n      if (resource.changeImpact !== downstreamReplacement.changeImpact) {\n        propagatePropertyReplacement(downstreamReplacement, resource);\n      }\n    });\n\n  return theDiff;\n}\n\nfunction isReplacement(impact: types.ResourceImpact) {\n  return impact === types.ResourceImpact.MAY_REPLACE || impact === types.ResourceImpact.WILL_REPLACE;\n}\n\n/**\n * For all properties in 'source' that have a \"replacement\" impact, propagate that impact to \"dest\"\n */\nfunction propagatePropertyReplacement(source: types.ResourceDifference, dest: types.ResourceDifference) {\n  for (const [propertyName, diff] of Object.entries(source.propertyUpdates)) {\n    if (diff.changeImpact && isReplacement(diff.changeImpact)) {\n      // Use the propertydiff of source in target. The result of this happens to be clear enough.\n      dest.setPropertyChange(propertyName, diff);\n    }\n  }\n}\n\nfunction calculateTemplateDiff(currentTemplate: { [key: string]: any }, newTemplate: { [key: string]: any }): types.TemplateDiff {\n  const differences: types.ITemplateDiff = {};\n  const unknown: { [key: string]: types.Difference<any> } = {};\n  for (const key of unionOf(Object.keys(currentTemplate), Object.keys(newTemplate)).sort()) {\n    const oldValue = currentTemplate[key];\n    const newValue = newTemplate[key];\n    if (deepEqual(oldValue, newValue)) {\n      continue;\n    }\n    const handler: DiffHandler = DIFF_HANDLERS[key]\n                  || ((_diff, oldV, newV) => unknown[key] = impl.diffUnknown(oldV, newV));\n    handler(differences, oldValue, newValue);\n  }\n  if (Object.keys(unknown).length > 0) {\n    differences.unknown = new types.DifferenceCollection(unknown);\n  }\n\n  return new types.TemplateDiff(differences);\n}\n\n/**\n * Replace all references to the given logicalID on the given template, in-place\n *\n * Returns true if any references were replaced.\n */\nfunction propagateReplacedReferences(template: object, logicalId: string): boolean {\n  let ret = false;\n\n  function recurse(obj: any) {\n    if (Array.isArray(obj)) {\n      obj.forEach(recurse);\n    }\n\n    if (typeof obj === 'object' && obj !== null) {\n      if (!replaceReference(obj)) {\n        Object.values(obj).forEach(recurse);\n      }\n    }\n  }\n\n  function replaceReference(obj: any) {\n    const keys = Object.keys(obj);\n    if (keys.length !== 1) {\n      return false;\n    }\n    const key = keys[0];\n\n    if (key === 'Ref') {\n      if (obj.Ref === logicalId) {\n        obj.Ref = logicalId + ' (replaced)';\n        ret = true;\n      }\n      return true;\n    }\n\n    if (key.startsWith('Fn::')) {\n      if (Array.isArray(obj[key]) && obj[key].length > 0 && obj[key][0] === logicalId) {\n        obj[key][0] = logicalId + '(replaced)';\n        ret = true;\n      }\n      return true;\n    }\n\n    return false;\n  }\n\n  recurse(template);\n  return ret;\n}\n\nfunction deepCopy(x: any): any {\n  if (Array.isArray(x)) {\n    return x.map(deepCopy);\n  }\n\n  if (typeof x === 'object' && x !== null) {\n    const ret: any = {};\n    for (const key of Object.keys(x)) {\n      ret[key] = deepCopy(x[key]);\n    }\n    return ret;\n  }\n\n  return x;\n}\n\nfunction makeAllResourceChangesImports(diff: types.TemplateDiff) {\n  diff.resources.forEachDifference((_logicalId: string, change: types.ResourceDifference) => {\n    change.isImport = true;\n  });\n}\n\nfunction normalize(template: any) {\n  if (typeof template === 'object') {\n    for (const key of (Object.keys(template ?? {}))) {\n      if (key === 'Fn::GetAtt' && typeof template[key] === 'string') {\n        template[key] = template[key].split('.');\n        continue;\n      } else if (key === 'DependsOn') {\n        if (typeof template[key] === 'string') {\n          template[key] = [template[key]];\n        } else if (Array.isArray(template[key])) {\n          template[key] = template[key].sort();\n        }\n        continue;\n      }\n\n      if (Array.isArray(template[key])) {\n        for (const element of (template[key])) {\n          normalize(element);\n        }\n      } else {\n        normalize(template[key]);\n      }\n    }\n  }\n}\n"]}