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fix(cloudformation-diff): ignore changes to DependsOn
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Don't consider absence of changes to Properties to be certain
changes to Type (other things that could have changed are for
example DependsOn and UpdatePolicy). Check for that explicitly.

Fixes #274.
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Rico Huijbers committed Oct 24, 2018
1 parent a004a38 commit 7c47cfd
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Showing 3 changed files with 72 additions and 34 deletions.
29 changes: 13 additions & 16 deletions packages/@aws-cdk/cloudformation-diff/lib/diff/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -27,25 +27,22 @@ export function diffParameter(oldValue: types.Parameter, newValue: types.Paramet
}

export function diffResource(oldValue: types.Resource, newValue: types.Resource): types.ResourceDifference {
let resourceType: string | { oldType: string, newType: string } =
((oldValue && oldValue.Type) || (newValue && newValue.Type)) as string;
const resourceType = {
oldType: oldValue && oldValue.Type,
newType: newValue && newValue.Type
};
let propertyChanges: { [key: string]: types.PropertyDifference<any> } = {};
let otherChanges: { [key: string]: types.Difference<any> } = {};

if (oldValue && newValue) {
const oldType = oldValue.Type as string;
const newType = newValue.Type as string;
if (oldType !== newType) {
resourceType = { oldType, newType };
} else {
const typeSpec = cfnspec.filteredSpecification(oldType);
const impl = typeSpec.ResourceTypes[oldType];
propertyChanges = diffKeyedEntities(oldValue.Properties,
newValue.Properties,
(oldVal, newVal, key) => _diffProperty(oldVal, newVal, key, impl));
otherChanges = diffKeyedEntities(oldValue, newValue, _diffOther);
delete otherChanges.Properties;
}
if (resourceType.oldType === resourceType.newType) {
// Only makes sense to inspect deeper if the types stayed the same
const typeSpec = cfnspec.filteredSpecification(resourceType.oldType);
const impl = typeSpec.ResourceTypes[resourceType.oldType];
propertyChanges = diffKeyedEntities(oldValue.Properties,
newValue.Properties,
(oldVal, newVal, key) => _diffProperty(oldVal, newVal, key, impl));
otherChanges = diffKeyedEntities(oldValue, newValue, _diffOther);
delete otherChanges.Properties;
}

return new types.ResourceDifference(oldValue, newValue, { resourceType, propertyChanges, otherChanges });
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31 changes: 22 additions & 9 deletions packages/@aws-cdk/cloudformation-diff/lib/diff/types.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -210,17 +210,18 @@ export interface Resource {
[key: string]: any;
}
export class ResourceDifference extends Difference<Resource> {
/** The resource type (or old and new type if it has changed) */
public readonly resourceType: string | { readonly oldType: string, readonly newType: string };
/** Property-level changes on the resource */
public readonly propertyChanges: { [key: string]: PropertyDifference<any> };
/** Changes to non-property level attributes of the resource */
public readonly otherChanges: { [key: string]: Difference<any> };

/** The resource type (or old and new type if it has changed) */
private readonly resourceType: { readonly oldType: string, readonly newType: string };

constructor(oldValue: Resource | undefined,
newValue: Resource | undefined,
args: {
resourceType: string | { oldType: string, newType: string },
resourceType: { oldType: string, newType: string },
propertyChanges: { [key: string]: Difference<any> },
otherChanges: { [key: string]: Difference<any> }
}
Expand All @@ -231,14 +232,26 @@ export class ResourceDifference extends Difference<Resource> {
this.otherChanges = args.otherChanges;
}

public get oldResourceType(): string | undefined {
return this.resourceType.oldType;
}

public get newResourceType(): string | undefined {
return this.resourceType.newType;
}

public get changeImpact(): ResourceImpact {
if (Object.keys(this.propertyChanges).length === 0) {
if (typeof this.resourceType !== 'string') { return ResourceImpact.WILL_REPLACE; }
if (!this.oldValue) { return ResourceImpact.WILL_CREATE; }
return this.oldValue.DeletionPolicy === 'Retain'
? ResourceImpact.WILL_ORPHAN
: ResourceImpact.WILL_DESTROY;
// Check the Type first
if (this.resourceType.oldType !== this.resourceType.newType) {
if (this.resourceType.oldType === undefined) { return ResourceImpact.WILL_CREATE; }
if (this.resourceType.newType === undefined) {
return this.oldValue!.DeletionPolicy === 'Retain'
? ResourceImpact.WILL_ORPHAN
: ResourceImpact.WILL_DESTROY;
}
return ResourceImpact.WILL_REPLACE;
}

return Object.values(this.propertyChanges)
.map(elt => elt.changeImpact)
.reduce(worstImpact, ResourceImpact.WILL_UPDATE);
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46 changes: 37 additions & 9 deletions packages/@aws-cdk/cloudformation-diff/test/test.diff-template.ts
View file
Original file line number Diff line number Diff line change
Expand Up @@ -45,7 +45,7 @@ exports.diffTemplate = {
const difference = differences.resources.changes.BucketResource;
test.notStrictEqual(difference, undefined, 'the difference is on the BucketResource logical ID');
test.ok(difference && difference.isAddition, 'the difference reflects there was no such resource before');
test.deepEqual(difference && difference.resourceType, 'AWS::S3::Bucket', 'the difference reports the resource type');
test.deepEqual(difference && difference.newResourceType, 'AWS::S3::Bucket', 'the difference reports the resource type');
test.equal(difference && difference.changeImpact, ResourceImpact.WILL_CREATE, 'the difference reflects that a new resource will be created');
test.done();
},
Expand All @@ -70,7 +70,7 @@ exports.diffTemplate = {
const difference = differences.resources.changes.BucketPolicyResource;
test.notStrictEqual(difference, undefined, 'the difference is on the BucketPolicyResource logical ID');
test.ok(difference && difference.isRemoval, 'the difference reflects there is no such resource after');
test.deepEqual(difference && difference.resourceType, 'AWS::S3::BucketPolicy', 'the difference reports the resource type');
test.deepEqual(difference && difference.oldResourceType, 'AWS::S3::BucketPolicy', 'the difference reports the resource type');
test.equal(difference && difference.changeImpact, ResourceImpact.WILL_DESTROY, 'the difference reflects that the resource will be deleted');
test.done();
},
Expand Down Expand Up @@ -100,7 +100,7 @@ exports.diffTemplate = {
const difference = differences.resources.changes.BucketPolicyResource;
test.notStrictEqual(difference, undefined, 'the difference is on the BucketPolicyResource logical ID');
test.ok(difference && difference.isRemoval, 'the difference reflects there is no such resource after');
test.deepEqual(difference && difference.resourceType, 'AWS::S3::BucketPolicy', 'the difference reports the resource type');
test.deepEqual(difference && difference.oldResourceType, 'AWS::S3::BucketPolicy', 'the difference reports the resource type');
test.equal(difference && difference.changeImpact, ResourceImpact.WILL_ORPHAN, 'the difference reflects that the resource will be orphaned');
test.done();
},
Expand Down Expand Up @@ -137,13 +137,42 @@ exports.diffTemplate = {
test.equal(differences.resources.count, 1, 'the difference is in the Resources section');
const difference = differences.resources.changes.BucketResource;
test.notStrictEqual(difference, undefined, 'the difference is on the BucketResource logical ID');
test.equal(difference && difference.resourceType, 'AWS::S3::Bucket', 'the difference reports the resource type');
test.equal(difference && difference.oldResourceType, 'AWS::S3::Bucket', 'the difference reports the resource type');
test.deepEqual(difference && difference.propertyChanges,
{ BucketName: { oldValue: bucketName, newValue: newBucketName, changeImpact: ResourceImpact.WILL_REPLACE } },
'the difference reports property-level changes');
test.done();
},

'change in dependencies counts as a simple update'(test: Test) {
// GIVEN
const currentTemplate = {
Resources: {
BucketResource: {
Type: 'AWS::S3::Bucket',
DependsOn: ['SomeResource']
}
}
};

// WHEN
const newTemplate = {
Resources: {
BucketResource: {
Type: 'AWS::S3::Bucket',
DependsOn: ['SomeResource', 'SomeOtherResource']
}
}
};
const differences = diffTemplate(currentTemplate, newTemplate);

// THEN
test.equal(differences.count, 1, 'no change');
const difference = differences.resources.changes.BucketResource;
test.equal(difference && difference.changeImpact, ResourceImpact.WILL_UPDATE, 'the difference reflects that the resource will be replaced');
test.done();
},

'when a property is deleted': (test: Test) => {
const bucketName = 'ShineyBucketName';
const currentTemplate = {
Expand Down Expand Up @@ -172,7 +201,7 @@ exports.diffTemplate = {
test.equal(differences.resources.count, 1, 'the difference is in the Resources section');
const difference = differences.resources.changes.BucketResource;
test.notStrictEqual(difference, undefined, 'the difference is on the BucketResource logical ID');
test.equal(difference && difference.resourceType, 'AWS::S3::Bucket', 'the difference reports the resource type');
test.equal(difference && difference.oldResourceType, 'AWS::S3::Bucket', 'the difference reports the resource type');
test.deepEqual(difference && difference.propertyChanges,
{ BucketName: { oldValue: bucketName, newValue: undefined, changeImpact: ResourceImpact.WILL_REPLACE } },
'the difference reports property-level changes');
Expand Down Expand Up @@ -207,7 +236,7 @@ exports.diffTemplate = {
test.equal(differences.resources.count, 1, 'the difference is in the Resources section');
const difference = differences.resources.changes.BucketResource;
test.notStrictEqual(difference, undefined, 'the difference is on the BucketResource logical ID');
test.equal(difference && difference.resourceType, 'AWS::S3::Bucket', 'the difference reports the resource type');
test.equal(difference && difference.oldResourceType, 'AWS::S3::Bucket', 'the difference reports the resource type');
test.deepEqual(difference && difference.propertyChanges,
{ BucketName: { oldValue: undefined, newValue: bucketName, changeImpact: ResourceImpact.WILL_REPLACE } },
'the difference reports property-level changes');
Expand Down Expand Up @@ -242,9 +271,8 @@ exports.diffTemplate = {
test.equal(differences.resources.count, 1, 'the difference is in the Resources section');
const difference = differences.resources.changes.BucketResource;
test.notStrictEqual(difference, undefined, 'the difference is on the BucketResource logical ID');
test.deepEqual(difference && difference.resourceType,
{ oldType: 'AWS::IAM::Policy', newType: 'AWS::S3::Bucket' },
'the difference reflects the type change');
test.deepEqual(difference && difference.oldResourceType, 'AWS::IAM::Policy');
test.deepEqual(difference && difference.newResourceType, 'AWS::S3::Bucket');
test.equal(difference && difference.changeImpact, ResourceImpact.WILL_REPLACE, 'the difference reflects that the resource will be replaced');
test.done();
}
Expand Down

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