Codegen EntitySelectionTree + MergedSelections Refactor + Perf Improvments #152

AnthonyMDev · 2023-11-20T23:04:58Z

This PR does a number of things to refactor the Codegen engine in preparation for the disabling of merged fragment fields and improve the performance of the Codegen engine.

EntitySelectionTree now computes the merged fields from merged fragments as needed when the merged fields are calculated, rather than when the fragment is initially merged in.
- This reduces memory consumption by not storing duplicated selections.
- This likely improves execution time as well
- Thanks @BobaFetters for the idea to make this algorithmic improvement!
RootFieldEntityStorage renamed to DefinitionEntityStorage and attached to definition.
- The new EntitySelectionTree algorithm requires the entity storage at the time of calculation merged fields (since we are no longer merging the fragments and creating new entities when merging the selections in)
IR.Definition refactored from an enum to a protocol.
- This improves usage flexibility.
Refactor IR.SelectionSet
- Improve initializers and clean up RootFieldBuilder logic.
- Move merged selections to new ComputedSelectionSet
  - The merged selections require a lot of memory since they hold a lot of duplicate instances of the selections from their direct instance. Making them a lazy var on SelectionSet was convenient for use, but it meant they were retained for the entire time the SelectionSet was in memory. Since IR.Operation and IR.NamedFragment retain their rootField these were being retained for the entire execution of codegen.
  - ComputedSelectionSet, which now computes and stores the merged selections, is created as needed in the SelectionSetTemplate using the new ComputedSelectionSet.Builder. These computed selection sets can be used when needed to render the selection set templates and then be released. This should improve memory consumption greatly.
Changes the generated model format for using referenced fragments (precursor to hoisted types).
- Though we haven't implemented intelligent hoisted types yet, there are times when a field accessor for a merged field points to another generated SelectionSet, rather than generating its own child selection set with the same exact shape.
- The determination of whether a selection set can use a referenced fragment depends on the merged selections, but we no longer want to compute these and retain them on the IR.SelectionSet, which stays in memory for the entirety of execution.
- Since we don't compute the merged selections until the generation of that actual selection set, we don't know if it will be a referenced fragment at the time of the generation of field accessors, selection set initializer parameters, etc.
- To work around this, we are generating those references using the name of the selection set as it would be if it were to be rendered as a child of the current selection set. When we compute the merged selections, if we recognize that we should use a reference to another selection set, we then create a typealias pointing to the correct fully qualified name of the referenced fragment instead of generating the selection set.
Create new IRTestWrapper classes in ApolloCodegenInternalTestHelpers.
- Because a lot of our tests are using the test subscripts to access and verify the built selections using both the direct and merged selections, they would have required a lot of changes and messy code to build the ComputedSelectionSet for each nested child entity.
- These IRTestWrapper instances wrap the existing IR objects. The subscripts for testing are now provided by the IRTestWrapper, which handle the computation of merged fields internally as they are accessed.
- This means the changes to the unit test code is minimal, while still maintaining the intentions and functionality of the existing tests.

TODO:

Finish fixing the call sites in unit tests as necessary
Fix type conflict validation (this has to be done in SelectionSetTemplate when the ComputedSelectionSet has been built.)
Improve IRTestWrapper to store the ComputedSelectionSet for reuse during a single test run.
Finish documentation updates
Run performance tests for metrics

After this PR is completed, the work to create the configuration options for disabling merged fragment fields will be unlocked.

…ragments WIP: See entityStorage move Stash SortedSelections.swift for next steps

# Conflicts: # apollo-ios-codegen/Sources/IR/IR+DirectSelections.swift # apollo-ios-codegen/Sources/IR/IR+EntitySelectionTree.swift # apollo-ios-codegen/Sources/IR/IR+RootFieldBuilder.swift

…-merge-fragment-ref

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…-merge-fragment-ref

pm-dev · 2023-12-19T08:25:59Z

Looking forward to this one

AnthonyMDev · 2023-12-19T17:41:06Z

@pm-dev. This is the foundational refactoring needed to enable disabling of fragment field merging. That will finally get us to a point where the codegen will work on your project!

calvincestari

Great improvements here, thank you!

Co-authored-by: Calvin Cestari <[email protected]> Co-authored-by: gh-action-runner <[email protected]> Co-authored-by: gh-action-runner <[email protected]> Co-authored-by: gh-action-runner <[email protected]> Co-authored-by: Jeff Auriemma <[email protected]> Co-authored-by: gh-action-runner <[email protected]> Co-authored-by: Zach FettersMoore <[email protected]> Co-authored-by: SecOps[bot] <[email protected]> Co-authored-by: gh-action-runner <[email protected]> Co-authored-by: gh-action-runner <[email protected]>

…ments (#152)

…ments (apollographql/apollo-ios-dev#152)

2457cb65 Codegen EntitySelectionTree + MergedSelections Refactor + Perf Improvments (#152) git-subtree-dir: apollo-ios-codegen git-subtree-split: 2457cb659273c7938a4a757f5676b216c5f4d720

…ergedSelections Refactor + Perf Improvments git-subtree-dir: apollo-ios-codegen git-subtree-mainline: 8b2eb70 git-subtree-split: 2457cb659273c7938a4a757f5676b216c5f4d720

AnthonyMDev added 29 commits October 30, 2023 17:03

Refactor EntitySelectionTree to merge in references to merged named f…

67555a5

…ragments WIP: See entityStorage move Stash SortedSelections.swift for next steps

WIP

d6a31e5

WIP: Make merged selections builder

5770081

Refactoring SelectionSet model and initializer usages

a59d374

Add build function to MergedSelections.Builder

754b9e9

Merge branch 'main' into entity-selection-tree-merge-fragment-ref

991d4b4

# Conflicts: # apollo-ios-codegen/Sources/IR/IR+DirectSelections.swift # apollo-ios-codegen/Sources/IR/IR+EntitySelectionTree.swift # apollo-ios-codegen/Sources/IR/IR+RootFieldBuilder.swift

Refactoring SelectionSetTemplate to use new IR structure

ff9a98c

WIP: Refactor to use typealias for referenced Selection Sets

92e31fa

TEMP: Comment out type conflict validation

86086c0

Rename ComputedSelections -> ComputedSelectionSet

2968927

Make TemplateString take an optional TemplateString

d593207

WIP: Creating IRTestWrappers

9591649

Refactor EntityStorage to attach to definition

f3ee3d5

Refactor MergedSelections.Builder to ComputedSelectionSet.Builder

7a02ee6

Finish implementing IRTestWrapper functionality

67d6027

WIP: Refactoring tests

f283dc0

More test fixes

fadf702

Add debug description to test wrappers

ec5c318

Fix fragment merging bug in entity selection tree

15a7f06

Fix root field builder scope condition bug

f7511ff

More test clean up

7672da3

Merge remote-tracking branch 'origin/main' into entity-selection-tree…

31710c2

…-merge-fragment-ref

Rename render(childEntity:)

8b3a140

WIP: Updating tests

0ce8731

Skip broken validation tests temporarialy

add3d37

WIP: IRTestWrapper improvements

3123fd7

Merge remote-tracking branch 'origin/main' into entity-selection-tree…

9baa44b

…-merge-fragment-ref

Cleanup

e1db84f

Fix nested Selection Set typealias for direct parent

c40f212

AnthonyMDev marked this pull request as ready for review December 8, 2023 19:12

AnthonyMDev requested a review from a team as a code owner December 8, 2023 19:12

AnthonyMDev marked this pull request as draft December 8, 2023 19:12

Merge branch 'main' into entity-selection-tree-merge-fragment-ref

1b7526c

AnthonyMDev mentioned this pull request Dec 16, 2023

Codegen Vaildation - Handle Non Fatal Errors #202

Merged

Merge branch 'main' into entity-selection-tree-merge-fragment-ref

e6c622c

AnthonyMDev added 2 commits December 18, 2023 11:37

Merge remote-tracking branch 'origin/main' into entity-selection-tree…

6337310

…-merge-fragment-ref

Updated documentation

dfcda81

AnthonyMDev marked this pull request as ready for review December 19, 2023 17:41

calvincestari approved these changes Dec 19, 2023

View reviewed changes

AnthonyMDev and others added 5 commits December 20, 2023 13:31

Fix SwiftScripts (remove CCN)

b51bb5a

Fix bug adding extra whitespace

1ff40a4

Re-run SwiftScripts Codegen

f2113fd

Merge branch 'main' into entity-selection-tree-merge-fragment-ref

4afc607

AnthonyMDev merged commit 08d02a3 into main Dec 20, 2023

AnthonyMDev deleted the entity-selection-tree-merge-fragment-ref branch December 20, 2023 21:59

BobaFetters pushed a commit that referenced this pull request Dec 20, 2023

Codegen EntitySelectionTree + MergedSelections Refactor + Perf Improv…

8b2eb70

…ments (#152)

BobaFetters pushed a commit to apollographql/apollo-ios-codegen that referenced this pull request Dec 20, 2023

Codegen EntitySelectionTree + MergedSelections Refactor + Perf Improv…

2457cb6

…ments (apollographql/apollo-ios-dev#152)

matsudamper mentioned this pull request Jan 22, 2024

fix Custom Scalar should not be edited. output #243

Merged

pm-dev mentioned this pull request Apr 24, 2024

Implement codegen configuration for field merging apollographql/apollo-ios#2560

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Codegen EntitySelectionTree + MergedSelections Refactor + Perf Improvments #152

Codegen EntitySelectionTree + MergedSelections Refactor + Perf Improvments #152

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Codegen EntitySelectionTree + MergedSelections Refactor + Perf Improvments #152

Codegen EntitySelectionTree + MergedSelections Refactor + Perf Improvments #152

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