feat: embed construct paths in CloudFormation metadata

In order to allow tools that read a CloudFormation template created by
the CDK to be able to present the CDK path of resources in the template,
the CDK now embeds the full path as CloudFormation metadata "aws:cdk:path"
entry for each resource.

To disable this behavior use the switch `--no-path-metadata` or set
`pathMetadata` to `false` in `cdk.json` or `~/.cdk.json`.

The toolkit can control this behavior by setting the
"aws:cdk:enable-path-metadata" context key. It sets it to `true` by
default.

The default behavior of the *Resource class* is _not_ to include
metadata. This is in order to maintain backwards compatibility
for tests. `cdk-integ` also disables this by default.

Fixes #1182
Related #1121

.gitignore

@@ -11,3 +11,6 @@ coverage
 .nyc_output
 .LAST_BUILD
 *.swp
+
+# we don't want tsconfig at the root
+/tsconfig.json

packages/@aws-cdk/cdk/lib/cloudformation/resource.ts

@@ -1,3 +1,4 @@
+import cxapi = require('@aws-cdk/cx-api');
 import { Construct } from '../core/construct';
 import { capitalizePropertyNames, ignoreEmpty } from '../core/util';
 import { CloudFormationToken } from './cloudformation-token';
@@ -86,6 +87,15 @@ export class Resource extends Referenceable {
 
     this.resourceType = props.type;
     this.properties = props.properties || { };
+
+    // if aws:cdk:enable-path-metadata is set, embed the current construct's
+    // path in the CloudFormation template, so it will be possible to trace
+    // back to the actual construct path.
+    if (this.getContext(cxapi.PATH_METADATA_ENABLE_CONTEXT)) {
+      this.options.metadata = {
+        [cxapi.PATH_METADATA_KEY]: this.path
+      };
+    }
   }
 
   /**

packages/@aws-cdk/cdk/test/cloudformation/test.resource.ts

@@ -1,3 +1,4 @@
+import cxapi = require('@aws-cdk/cx-api');
 import { Test } from 'nodeunit';
 import { applyRemovalPolicy, Condition, Construct, DeletionPolicy,
     FnEquals, FnNot, HashedAddressingScheme, IDependable,
@@ -570,6 +571,24 @@ export = {
         test.done();
       }
     }
+  },
+
+  '"aws:cdk:path" metadata is added if "aws:cdk:path-metadata" context is set to true'(test: Test) {
+    const stack = new Stack();
+    stack.setContext(cxapi.PATH_METADATA_ENABLE_CONTEXT, true);
+
+    const parent = new Construct(stack, 'Parent');
+
+    new Resource(parent, 'MyResource', {
+      type: 'MyResourceType',
+    });
+
+    test.deepEqual(stack.toCloudFormation(), { Resources:
+      { ParentMyResource4B1FDBCC:
+         { Type: 'MyResourceType',
+           Metadata: { [cxapi.PATH_METADATA_KEY]: 'Parent/MyResource' } } } });
+
+    test.done();
   }
 };
 

packages/@aws-cdk/cx-api/lib/cxapi.ts

@@ -176,6 +176,17 @@ export const WARNING_METADATA_KEY = 'aws:cdk:warning';
  */
 export const ERROR_METADATA_KEY = 'aws:cdk:error';
 
+/**
+ * The key used when CDK path is embedded in **CloudFormation template**
+ * metadata.
+ */
+export const PATH_METADATA_KEY = 'aws:cdk:path';
+
+/**
+ * Enables the embedding of the "aws:cdk:path" in CloudFormation template metadata.
+ */
+export const PATH_METADATA_ENABLE_CONTEXT = 'aws:cdk:enable-path-metadata';
+
 /**
  * Separator string that separates the prefix separator from the object key separator.
  *

packages/aws-cdk/bin/cdk.ts

@@ -50,7 +50,8 @@ async function parseCommandLineArguments() {
     .option('profile', { type: 'string', desc: 'Use the indicated AWS profile as the default environment' })
     .option('proxy', { type: 'string', desc: 'Use the indicated proxy. Will read from HTTPS_PROXY environment variable if not specified.' })
     .option('ec2creds', { type: 'boolean', alias: 'i', default: undefined, desc: 'Force trying to fetch EC2 instance credentials. Default: guess EC2 instance status.' })
-    .option('version-reporting', { type: 'boolean', desc: 'Disable insersion of the CDKMetadata resource in synthesized templates', default: undefined })
+    .option('version-reporting', { type: 'boolean', desc: 'Include the "AWS::CDK::Metadata" resource in synthesized templates (enabled by default)', default: undefined })
+    .option('path-metadata', { type: 'boolean', desc: 'Include "aws:cdk:path" CloudFormation metadata for each resource (enabled by default)', default: true })
     .option('role-arn', { type: 'string', alias: 'r', desc: 'ARN of Role to use when invoking CloudFormation', default: undefined })
     .command([ 'list', 'ls' ], 'Lists all stacks in the app', yargs => yargs
       .option('long', { type: 'boolean', default: false, alias: 'l', desc: 'display environment information for each stack' }))
@@ -121,7 +122,7 @@ async function initCommandLine() {
     'hosted-zone': new contextplugins.HostedZoneContextProviderPlugin(aws),
   };
 
-  const defaultConfig = new Settings({ versionReporting: true });
+  const defaultConfig = new Settings({ versionReporting: true, pathMetadata: true });
   const userConfig = await new Settings().load(PER_USER_DEFAULTS);
   const projectConfig = await new Settings().load(DEFAULTS);
   const commandLineArguments = argumentsToSettings();
@@ -629,7 +630,11 @@ async function initCommandLine() {
 
   function logDefaults() {
     if (!userConfig.empty()) {
-      debug('Defaults loaded from ', PER_USER_DEFAULTS, ':', JSON.stringify(userConfig.settings, undefined, 2));
+      debug(PER_USER_DEFAULTS + ':', JSON.stringify(userConfig.settings, undefined, 2));
+    }
+
+    if (!projectConfig.empty()) {
+      debug(DEFAULTS + ':', JSON.stringify(projectConfig.settings, undefined, 2));
     }
 
     const combined = userConfig.merge(projectConfig);
@@ -664,6 +669,7 @@ async function initCommandLine() {
       plugin: argv.plugin,
       toolkitStackName: argv.toolkitStackName,
       versionReporting: argv.versionReporting,
+      pathMetadata: argv.pathMetadata,
     });
   }
 

packages/aws-cdk/lib/exec.ts

@@ -15,6 +15,17 @@ export async function execProgram(aws: SDK, config: Settings): Promise<cxapi.Syn
   const context = config.get(['context']);
   await populateDefaultEnvironmentIfNeeded(aws, context);
 
+  let pathMetadata: boolean = config.get(['pathMetadata']);
+  if (pathMetadata === undefined) {
+      pathMetadata = true; // default to true
+  }
+
+  if (pathMetadata) {
+    context[cxapi.PATH_METADATA_ENABLE_CONTEXT] = true;
+  }
+
+  debug('context:', context);
+
   env[cxapi.CONTEXT_ENV] = JSON.stringify(context);
 
   const app = config.get(['app']);

tools/cdk-integ-tools/bin/cdk-integ.ts

@@ -18,7 +18,8 @@ async function main() {
     console.error(`Trying to deploy ${test.name}`);
 
     // injects "--verbose" to the command line of "cdk" if we are in verbose mode
-    const makeArgs = (...args: string[]) => !argv.verbose ? args : [ '--verbose', ...args ];
+    // inject "--no-path-metadata" so aws:cdk:path entries are not added to CFN metadata
+    const makeArgs = (...args: string[]) => !argv.verbose ? args : [ '--verbose', '--no-path-metadata', ...args ];
 
     try {
       await test.invoke(makeArgs('deploy'), { verbose: argv.verbose }); // Note: no context, so use default user settings!