cdk-pretty-diff
Version:
Formatting tool for CDK Diff output. Inspired by Terraform prettyplan (https://github.com/chrislewisdev/prettyplan)
176 lines • 22.5 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.getDiffObject = exports.deepSubstituteBracedLogicalIds = void 0;
const cdk = require("aws-cdk-lib");
const cfnDiff = require("@aws-cdk/cloudformation-diff");
const cxschema = require("@aws-cdk/cloud-assembly-schema");
const aws_auth_1 = require("aws-cdk/lib/api/aws-auth");
const colors = require("colors/safe");
// reverse engineered from:
// aws-cdk/lib/diff (printStackDiff)
const filterCDKMetadata = (diff) => {
// filter out 'AWS::CDK::Metadata' resources from the template
if (diff.resources) {
diff.resources = diff.resources.filter((change) => {
if (!change) {
return true;
}
if (change.newResourceType === 'AWS::CDK::Metadata') {
return false;
}
if (change.oldResourceType === 'AWS::CDK::Metadata') {
return false;
}
return true;
});
}
return diff;
};
// reverse engineered from:
// @aws-cdk/cloudformation-diff/lib/format (Formatter class is not exported)
/**
* Substitute all strings like ${LogId.xxx} with the path instead of the logical ID
*/
const substituteBracedLogicalIds = (logicalToPathMap) => (source) => {
return source.replace(/\$\{([^.}]+)(.[^}]+)?\}/gi, (_match, logId, suffix) => {
return ('${' +
(normalizedLogicalIdPath(logicalToPathMap)(logId) || logId) +
(suffix || '') +
'}');
});
};
// reverse engineered from:
// @aws-cdk/cloudformation-diff/lib/format (Formatter class is not exported)
const deepSubstituteBracedLogicalIds = (logicalToPathMap) => (rows) => {
return rows.map((row) => row.map(substituteBracedLogicalIds(logicalToPathMap)));
};
exports.deepSubstituteBracedLogicalIds = deepSubstituteBracedLogicalIds;
// reverse engineered from:
// @aws-cdk/cloudformation-diff/lib/format (Formatter class is not exported)
const normalizedLogicalIdPath = (logicalToPathMap) => (logicalId) => {
// if we have a path in the map, return it
const path = logicalToPathMap[logicalId];
return path ? normalizePath(path) : undefined;
/**
* Path is supposed to start with "/stack-name". If this is the case (i.e. path has more than
* two components, we remove the first part. Otherwise, we just use the full path.
* @param p
*/
function normalizePath(p) {
if (p.startsWith('/')) {
p = p.substr(1);
}
let parts = p.split('/');
if (parts.length > 1) {
parts = parts.slice(1);
// remove the last component if it's "Resource" or "Default" (if we have more than a single component)
if (parts.length > 1) {
const last = parts[parts.length - 1];
if (last === 'Resource' || last === 'Default') {
parts = parts.slice(0, parts.length - 1);
}
}
p = parts.join('/');
}
return p;
}
};
// copied from
// aws-cdk/lib/diff (function not exported)
const buildLogicalToPathMap = (stack) => {
const map = {};
for (const md of stack.findMetadataByType(cxschema.ArtifactMetadataEntryType.LOGICAL_ID)) {
map[md.data] = md.path;
}
return map;
};
const dynamicallyInstantiateDeployments = (sdkProvider) => {
let Deployments;
let cdkToolkitDeploymentsProp = 'deployments';
try {
Deployments = require('aws-cdk/lib/api/deployments').Deployments;
}
catch (err) {
Deployments = require('aws-cdk/lib/api/cloudformation-deployments').CloudFormationDeployments;
cdkToolkitDeploymentsProp = 'cloudFormation';
}
const deployments = new Deployments({
sdkProvider,
ioHelper: {
defaults: {
debug: (input) => { console.debug(input); },
}
},
});
return {
deployments,
cdkToolkitDeploymentsProp,
};
};
async function getDiffObject(app, options) {
// If we have new context, we need to create a new app with the merged context
if (options === null || options === void 0 ? void 0 : options.context) {
// Get existing context
const existingContext = app.node.tryGetContext('');
// Create new merged context
const mergedContext = {
...existingContext,
...options.context
};
// Create a new App with merged context
const tempApp = new cdk.App({
context: mergedContext,
});
// For each stack in the original app, create a new stack in the temp app
for (const child of app.node.children) {
if (child instanceof cdk.Stack) {
const originalStack = child;
// Create a new stack of the same type
const stackProps = {
env: {
account: originalStack.account,
region: originalStack.region
},
// Copy other stack properties that might be important
stackName: originalStack.stackName,
description: originalStack.templateOptions.description,
terminationProtection: originalStack.terminationProtection,
tags: originalStack.tags.tagValues(),
};
// Use reflection to create a new instance of the same stack class
const stackClass = Object.getPrototypeOf(originalStack).constructor;
new stackClass(tempApp, originalStack.node.id, stackProps);
}
}
// Use the temporary app for synthesis
const assembly = tempApp.synth();
return await generateDiffs(assembly, options);
}
// If no new context, use the original app
const assembly = app.synth();
return await generateDiffs(assembly, options);
}
exports.getDiffObject = getDiffObject;
// Helper function to generate diffs from an assembly
async function generateDiffs(assembly, options) {
const sdkProvider = await aws_auth_1.SdkProvider.withAwsCliCompatibleDefaults({
ioHelper: {
defaults: {
debug: (input) => { console.debug(input); },
}
},
}, options === null || options === void 0 ? void 0 : options.profile);
colors.disable();
const { deployments } = dynamicallyInstantiateDeployments(sdkProvider);
const diffs = [];
for (const stack of assembly.stacks) {
const currentTemplate = await deployments.readCurrentTemplate(stack);
diffs.push({
stackName: stack.displayName,
rawDiff: filterCDKMetadata(cfnDiff.diffTemplate(currentTemplate, stack.template)),
logicalToPathMap: buildLogicalToPathMap(stack)
});
}
return diffs;
}
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* as cdk from 'aws-cdk-lib';\nimport * as cfnDiff from '@aws-cdk/cloudformation-diff';\nimport * as cxschema from '@aws-cdk/cloud-assembly-schema';\nimport { SdkProvider } from 'aws-cdk/lib/api/aws-auth';\nimport * as colors from 'colors/safe';\nimport { CdkToolkitDeploymentsProp, DiffOptions, StackRawDiff } from './types';\n\n// reverse engineered from:\n// aws-cdk/lib/diff (printStackDiff)\nconst filterCDKMetadata = (\n  diff: StackRawDiff['rawDiff']\n): StackRawDiff['rawDiff'] => {\n  // filter out 'AWS::CDK::Metadata' resources from the template\n  if (diff.resources) {\n    diff.resources = diff.resources.filter((change) => {\n      if (!change) {\n        return true;\n      }\n      if (change.newResourceType === 'AWS::CDK::Metadata') {\n        return false;\n      }\n      if (change.oldResourceType === 'AWS::CDK::Metadata') {\n        return false;\n      }\n      return true;\n    });\n  }\n\n  return diff;\n};\n\n// reverse engineered from:\n// @aws-cdk/cloudformation-diff/lib/format (Formatter class is not exported)\n/**\n * Substitute all strings like ${LogId.xxx} with the path instead of the logical ID\n */\nconst substituteBracedLogicalIds = (logicalToPathMap: any) => (source: any) => {\n  return source.replace(\n    /\\$\\{([^.}]+)(.[^}]+)?\\}/gi,\n    (_match: any, logId: any, suffix: any) => {\n      return (\n        '${' +\n        (normalizedLogicalIdPath(logicalToPathMap)(logId) || logId) +\n        (suffix || '') +\n        '}'\n      );\n    }\n  );\n};\n\n// reverse engineered from:\n// @aws-cdk/cloudformation-diff/lib/format (Formatter class is not exported)\nexport const deepSubstituteBracedLogicalIds =\n  (logicalToPathMap: any) => (rows: any) => {\n    return rows.map((row: any[]) =>\n      row.map(substituteBracedLogicalIds(logicalToPathMap))\n    );\n  };\n\n// reverse engineered from:\n// @aws-cdk/cloudformation-diff/lib/format (Formatter class is not exported)\nconst normalizedLogicalIdPath = (logicalToPathMap: any) => (logicalId: any) => {\n  // if we have a path in the map, return it\n  const path = logicalToPathMap[logicalId];\n  return path ? normalizePath(path) : undefined;\n  /**\n   * Path is supposed to start with \"/stack-name\". If this is the case (i.e. path has more than\n   * two components, we remove the first part. Otherwise, we just use the full path.\n   * @param p\n   */\n  function normalizePath(p: string) {\n    if (p.startsWith('/')) {\n      p = p.substr(1);\n    }\n    let parts = p.split('/');\n    if (parts.length > 1) {\n      parts = parts.slice(1);\n      // remove the last component if it's \"Resource\" or \"Default\" (if we have more than a single component)\n      if (parts.length > 1) {\n        const last = parts[parts.length - 1];\n        if (last === 'Resource' || last === 'Default') {\n          parts = parts.slice(0, parts.length - 1);\n        }\n      }\n      p = parts.join('/');\n    }\n    return p;\n  }\n};\n\n// copied from\n// aws-cdk/lib/diff (function not exported)\nconst buildLogicalToPathMap = (\n  stack: cdk.cx_api.CloudFormationStackArtifact\n): Record<string, string> => {\n  const map: Record<string, any> = {};\n  for (const md of stack.findMetadataByType(\n    cxschema.ArtifactMetadataEntryType.LOGICAL_ID\n  )) {\n    map[md.data as string] = md.path;\n  }\n  return map;\n};\n\nconst dynamicallyInstantiateDeployments = (sdkProvider: SdkProvider) => {\n  let Deployments;\n  let cdkToolkitDeploymentsProp: CdkToolkitDeploymentsProp = 'deployments';\n\n  try {\n    Deployments = require('aws-cdk/lib/api/deployments').Deployments;\n  } catch(err) {\n    Deployments = require('aws-cdk/lib/api/cloudformation-deployments').CloudFormationDeployments;\n    cdkToolkitDeploymentsProp = 'cloudFormation';\n  }\n\n  const deployments = new Deployments({\n    sdkProvider,\n    ioHelper: {\n      defaults: {\n        debug: (input: string) => { console.debug(input) },\n      }\n    },\n  });\n\n  return {\n    deployments,\n    cdkToolkitDeploymentsProp,\n  }\n}\n\nexport async function getDiffObject(app: cdk.App, options?: DiffOptions) {\n  // If we have new context, we need to create a new app with the merged context\n  if (options?.context) {\n    // Get existing context\n    const existingContext = app.node.tryGetContext('');\n    \n    // Create new merged context\n    const mergedContext = {\n      ...existingContext,\n      ...options.context\n    };\n    \n    // Create a new App with merged context\n    const tempApp = new cdk.App({\n      context: mergedContext,\n    });\n\n    // For each stack in the original app, create a new stack in the temp app\n    for (const child of app.node.children) {\n      if (child instanceof cdk.Stack) {\n        const originalStack = child as cdk.Stack;\n        \n        // Create a new stack of the same type\n        const stackProps = {\n          env: {\n            account: originalStack.account,\n            region: originalStack.region\n          },\n          // Copy other stack properties that might be important\n          stackName: originalStack.stackName,\n          description: originalStack.templateOptions.description,\n          terminationProtection: originalStack.terminationProtection,\n          tags: originalStack.tags.tagValues(),\n        };\n\n        // Use reflection to create a new instance of the same stack class\n        const stackClass = Object.getPrototypeOf(originalStack).constructor;\n        new stackClass(tempApp, originalStack.node.id, stackProps);\n      }\n    }\n\n    // Use the temporary app for synthesis\n    const assembly = tempApp.synth();\n    return await generateDiffs(assembly, options);\n  }\n\n  // If no new context, use the original app\n  const assembly = app.synth();\n  return await generateDiffs(assembly, options);\n}\n\n// Helper function to generate diffs from an assembly\nasync function generateDiffs(assembly: cdk.cx_api.CloudAssembly, options?: DiffOptions): Promise<StackRawDiff[]> {\n  const sdkProvider = await SdkProvider.withAwsCliCompatibleDefaults({\n    ioHelper: {\n      defaults: {\n        debug: (input: string) => { console.debug(input) },\n      }\n    },\n  } as any, options?.profile);\n\n  colors.disable();\n\n  const { deployments } = dynamicallyInstantiateDeployments(sdkProvider);\n  const diffs: StackRawDiff[] = [];\n  \n  for (const stack of assembly.stacks) {\n    const currentTemplate = await deployments.readCurrentTemplate(stack);\n    \n    diffs.push({\n      stackName: stack.displayName,\n      rawDiff: filterCDKMetadata(\n        cfnDiff.diffTemplate(currentTemplate, stack.template)\n      ),\n      logicalToPathMap: buildLogicalToPathMap(stack)\n    });\n  }\n\n  return diffs;\n}\n"]}