feat: bidirectional references (non-batched operations) #345
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WalkthroughThis pull request implements extensive enhancements in GroveDB. The changes cover discussions on atomicity, the introduction and handling of bidirectional references, and improvements to MerkCache. Updates include new transaction management with a dedicated utility (TxRef) and refined versioning via new macros and field adjustments. Functionality in insertion, deletion, query, and proof operations has been expanded, and cost tracking and error handling have been streamlined. Several utility and testing modules have also been restructured to support these new features, ensuring consistency and enhanced transaction safety. Changes
Sequence Diagram(s)sequenceDiagram
participant C as Client
participant G as GroveDB
participant T as TxRef
participant B as BidiRefHandler
participant SB as StorageBatch
C->>G: Initiate Insert Operation
G->>T: Create or use existing TxRef
T-->>G: Provide Transaction Context
alt Element supports Bidirectional Ref
G->>B: Process Bidirectional Reference Insertion
B-->>G: Update Element with Backward Reference data
end
G->>SB: Merge changes into StorageBatch
T->>G: Commit Local transaction (if owned)
G-->>C: Return successful insertion with cost tracking
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| @@ -48,6 +48,7 @@ pub struct GroveDBOperationsGetVersions { | |||
| pub get: FeatureVersion, | |||
| pub get_caching_optional: FeatureVersion, | |||
| pub follow_reference: FeatureVersion, | |||
| pub ref_path_follow_reference: FeatureVersion, | |||
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I don't think we have covered a scenario when different parts of code shall use different version of a function both being within one GroveDb version, but here grovedb verification and batches use old follow_reference and other operations use a newer one, both inside v2, so just had a different name for this one
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Actionable comments posted: 5
🧹 Nitpick comments (54)
grovedb/src/operations/insert/v0.rs (2)
12-21: Consider reducing the number of parameters ininsert_on_transaction.This function has eight parameters, exceeding the recommended Clippy limit of seven. It may be beneficial to encapsulate some parameters into a dedicated struct or reuse existing data structures (e.g., merging
batchandtransactioninto a transaction-related struct).🧰 Tools
🪛 GitHub Check: clippy
[warning] 12-21: this function has too many arguments (8/7)
warning: this function has too many arguments (8/7)
--> grovedb/src/operations/insert/v0.rs:12:1
|
12 | / pub(super) fn insert_on_transaction<'db, 'b, B: AsRef<[u8]>>(
13 | | db: &GroveDb,
14 | | path: SubtreePath<'b, B>,
15 | | key: &[u8],
... |
20 | | grove_version: &GroveVersion,
21 | | ) -> CostResult<(), Error> {
| |__________________________^
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#too_many_arguments
50-52: Validate concurrent transaction behavior inpropagate_changes_with_transaction.While the
transactionreference implies safe usage, concurrency can be particularly tricky when multiple references to subtrees are being updated. Confirm that all subtrees and references are properly locked or isolated, especially with more advanced references planned in future expansions.grovedb/src/util/tx_ref.rs (1)
20-23: Consider clarifying commit or rollback strategy for borrowed transactions.When the variant is
Borrowed, the transaction remains external. Ensure that it's clear in calling contexts who is responsible for committing or rolling back, to prevent confusion or accidental incomplete commits. Document or enforce this behavior to avoid data inconsistencies.grovedb/src/util/visitor.rs (1)
125-140: Consider an optional hook forvisit_elementerrors or exceptions.Both
visit_merkandvisit_elementcan short-circuit by returningtrue. It may be beneficial to add a separate flow that distinguishes “early stop by design” from “stop due to error.” This would enhance clarity and help debug or chain logic if multiple visits are performed.grovedb/src/operations/insert/v1.rs (5)
17-26: Consider reducing the function’s argument count.Static analysis warns that this function accepts more arguments (8) than recommended (7). Grouping related parameters into a struct or employing a fluent builder pattern can improve readability and maintainability.
🧰 Tools
🪛 GitHub Check: clippy
[warning] 17-26: this function has too many arguments (8/7)
warning: this function has too many arguments (8/7)
--> grovedb/src/operations/insert/v1.rs:17:1
|
17 | / pub(super) fn insert_on_transaction<B: AsRef<[u8]>>(
18 | | db: &GroveDb,
19 | | path: SubtreePath<'_, B>,
20 | | key: &[u8],
... |
25 | | grove_version: &GroveVersion,
26 | | ) -> CostResult<(), Error> {
| |__________________________^
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#too_many_arguments
44-78: Unify or encapsulate the override checks for clarity.These checks (forbidden overrides, forbidden tree overrides, etc.) appear more than once and could be extracted into a helper function for a cleaner and more maintainable approach.
80-129: Validate reference consistency in broader usage.When a reference points to another element, any system with multiple references to that element may need cross-checks to ensure updates remain consistent. Confirm the rest of the codebase properly handles scenarios involving multiple forward references.
130-173: Consider refactoring repeated subtree insertion patterns.The logic for inserting a subtree (empty-check, optional backward references, etc.) is repeated. Extracting these steps into a shared helper function might reduce duplication.
187-219: Extract common “propagate_backward_references” blocks to reduce duplication.This branch also repeats the pattern of checking
propagate_backward_references. Refactoring into a generic insertion helper might reduce code repetition and potential errors.grovedb/src/operations/delete/v0.rs (3)
100-101: Clarify the TODO or remove if resolved.You have a
// todo: verify why we need to open the same merk againcomment. If you’ve already investigated or have context behind opening the same Merk again, consider adding an explanatory comment or removing the TODO.Do you want help drafting a short explanatory comment for future maintainers?
236-341: Function might benefit from modularization.
clear_subtree_with_costshas multiple branching paths and handles logic such as subtree checks, error conditions, cost tracking, and a final batch commit. Consider splitting out key logic (e.g., “check_subtrees_and_clear” or “finalize_batch”) into helper methods for clarity and testability.
435-445: Provide verification for “todo” cost metrics in tests.You have inline comments indicating uncertainty about
seek_countandhash_node_calls. You could confirm correctness by collecting operational logs or adding instrumentation in test code or a debugging environment. This ensures your cost modeling remains accurate.Would you like a script or a diagnostic approach to analyze these cost metrics across multiple runs?
Also applies to: 530-540
grovedb/src/operations/delete/v1.rs (1)
293-401: Refactor might help clarity inclear_subtree_with_costs.Like in
v0.rs, consider modularizing or breaking down this function if it grows further. Multiple conditional paths for subtree checks, batch building, and final merges can be more readable when separated out into distinct helpers.grovedb/src/merk_cache.rs (1)
196-224: Re-initializing deleted Merk logic.When a subtree is marked as
Deleted, attempting a re-open from the parent is a neat fallback strategy. However, be mindful of stale references if external code tries to re-insert the same subtree concurrently. The approach is still coherent as long as the parent is updated consistently.grovedb/src/element/insert.rs (1)
15-19: Consider documenting lifetime assumptions for Delta
These fields hold mixed ownership (borrowed vs. owned). IfDeltaoutlives the source element, thenewreference could become invalid. Consider reinforcing or documenting the expected lifetime usage to avoid accidental misuse.grovedb/src/reference_path.rs (3)
75-140: Refactor theinvertfunction for clarity and reduced duplication.This match block is quite large and contains repetitive logic across its arms. Extracting common behaviors or breaking the function into smaller, more focused helpers can make the code easier to understand and maintain.
203-224: Consider consolidatingabsolute_path_using_current_qualified_pathwithabsolute_path.Both functions compute an absolute path based on a
ReferencePathType, but with slightly different inputs. Factoring their common logic into a shared utility could reduce code duplication and minimize maintenance effort.
549-639: Explore mergingfollow_referenceandfollow_reference_once.These two functions share a similar logic for resolving references, differing primarily in recursion depth and hop limits. Unifying them with an optional parameter could reduce code size and guard against future inconsistencies.
grovedb/src/element/query.rs (2)
451-672: Streamline the branching inpath_query_push.Conditions for handling subqueries, subquery paths, or raw retrieval are somewhat convoluted. Consider consolidating the branching logic or adding helper functions to reduce complexity and simplify reasoning about edge cases.
717-896: Watch for potential performance bottlenecks in range queries.The
query_itemfunction iterates over ranges using a raw iterator. For large datasets, this could be expensive. Consider using more efficient indexing or partial retrieval strategies if performance profiling shows bottlenecks.🧰 Tools
🪛 GitHub Check: clippy
[warning] 717-730: this function has too many arguments (12/7)
warning: this function has too many arguments (12/7)
--> grovedb/src/element/query.rs:717:5
|
717 | / fn query_item(
718 | | storage: &RocksDbStorage,
719 | | item: &QueryItem,
720 | | results: &mut Vec,
... |
729 | | grove_version: &GroveVersion,
730 | | ) -> CostResult<(), Error> {
| |______________________________^
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#too_many_argumentsgrovedb/src/bidirectional_references/handling.rs (2)
29-45: Revisit error handling for missing references inremove_backward_reference.Currently, the code tolerates missing references to gracefully handle out-of-sync or already-cascaded states. While pragmatic, this can also mask bugs. Periodically confirm your logs or metrics to ensure that legitimate errors aren’t silently ignored.
292-399: Prevent unintended partial overwrites inprocess_update_element_with_backward_references.When overwriting existing references or items that support backward references, some references might become dangling if not fully handled. A multi-step fallback or explicit partial-check could avoid silent data corruption.
grovedb/src/operations/insert/mod.rs (6)
3-4: Introduce module-level documentation for clarity.Defining new modules
mod v0andmod v1is a clean approach to handle versioned insert operations. Consider adding high-level comments describing each module’s responsibilities to assist maintainers with quick orientation.
7-7: Consider removing unneeded explicit import ofNone.
Noneis already available from the Rust prelude. Verify whether this explicit import is truly necessary under theminimalfeature.
39-42: Expand doc details forpropagate_backward_references.The doc comment nicely explains bidirectional references overhead. You might add guidelines on when to enable this field and note any expected performance implications.
63-63: Check naming consistency foras_merk_options.Publishing this helper is useful. Ensure consistency with naming conventions (e.g.,
into_merk_optionsif it consumesself, orto_merk_optionsif it borrowsself).
127-158: Versioned insertion dispatch.The
dispatch_version!macro elegantly routes to v0 or v1 implementations. Verify that both versions remain fully tested to avoid regressions. Consider extracting common logic to reduce duplication.
2194-2241: Add assertions to verify new item content beyond hash change.This test correctly confirms that backward references trigger a hash update. As a further validation, consider asserting the final item value and references are correct to avoid unnoticed regressions.
grovedb/src/operations/get/query.rs (3)
69-69: ConsistentTxRef::newusage.Adopting
TxRef::newin multiple methods maintains uniform transaction handling. Ensure you include test coverage for each path to confirm consistent behavior under all transaction scenarios.Also applies to: 270-270, 318-318, 421-421, 547-547
338-395: Enhanced item variants with backward references.The additional matches for
ItemWithBackwardsReferencesandSumItemWithBackwardsReferencesalign well with your newly introduced element types. Properly tested coverage is recommended due to the complexity of referencing logic.Also applies to: 497-499, 501-503
567-611: Sum query handling for references & backward references.Revising sum queries to handle
SumItemWithBackwardsReferencesis consistent with the overarching design. Keep an eye on performance with multiple nested references in large queries.grovedb/src/batch/options.rs (1)
54-54: Consider documenting the implications of disabling backward reference propagation.Both
InsertOptionsandDeleteOptionshavepropagate_backward_referencesset tofalseby default. While this is a safe default for backward compatibility, it could lead to unexpected behavior if users are unaware that batch operations won't update bidirectional references.Consider adding documentation to explain:
- The purpose of this flag
- The implications of setting it to
false- When users should consider enabling it
pub struct BatchApplyOptions { + /// Whether to propagate changes through backward references during batch operations. + /// When set to false, changes won't update bidirectional references, which might + /// lead to inconsistencies if not handled properly. + pub propagate_backward_references: bool,Also applies to: 65-65
grovedb/src/util/compat.rs (1)
108-112: Consider enhancing error messages with more context.The error messages could be more descriptive to help users better understand and debug issues:
- Error::PathParentLayerNotFound(format!( - "could not get key for parent of subtree optional on tx: {}", - e - )) + Error::PathParentLayerNotFound(format!( + "failed to retrieve parent key for subtree in transaction: {}. This might indicate a missing or corrupted parent node", + e + )) - Error::CorruptedData("cannot open a subtree".to_owned()) + Error::CorruptedData("failed to open base subtree: storage might be corrupted or inaccessible".to_owned()) - Error::CorruptedData("parent is not a tree".to_owned()) + Error::CorruptedData("expected parent node to be a tree, but found a different type".to_owned())Also applies to: 115-116, 119-120
grovedb/src/tests/common.rs (1)
42-160: Consider refactoring to reduce duplication and improve maintainability.While the test helper function is well-structured, there are opportunities for improvement:
- Extract common BidirectionalReference creation logic into a helper function
- Define constants for magic numbers (e.g.,
backward_reference_slot: 0)- Consider using a builder pattern for cleaner test data setup
Example refactor:
const DEFAULT_BACKWARD_SLOT: u32 = 0; struct BidiRefBuilder { forward_path: ReferencePathType, backward_slot: u32, cascade_on_update: bool, max_hop: Option<u32>, flags: Option<u32>, } impl BidiRefBuilder { fn new(forward_path: ReferencePathType) -> Self { Self { forward_path, backward_slot: DEFAULT_BACKWARD_SLOT, cascade_on_update: true, max_hop: None, flags: None, } } fn build(self) -> Element { Element::BidirectionalReference(BidirectionalReference { forward_reference_path: self.forward_path, backward_reference_slot: self.backward_slot, cascade_on_update: self.cascade_on_update, max_hop: self.max_hop, flags: self.flags, }) } }grovedb/src/error.rs (1)
171-198: Consider adding new error variants to add_context method.The new error variants BidirectionalReferenceRule and MerkCacheSubtreeDeleted should be included in the add_context match arms for consistent error context handling.
match self { Self::MissingReference(s) | Self::InternalError(s) | Self::InvalidProof(s) | Self::PathKeyNotFound(s) | Self::PathNotFound(s) | Self::PathParentLayerNotFound(s) | Self::CorruptedReferencePathKeyNotFound(s) | Self::CorruptedReferencePathNotFound(s) | Self::CorruptedReferencePathParentLayerNotFound(s) | Self::InvalidParentLayerPath(s) | Self::InvalidPath(s) | Self::CorruptedPath(s) | Self::CorruptedData(s) | Self::CorruptedStorage(s) | Self::DeleteUpTreeStopHeightMoreThanInitialPathSize(s) | Self::JustInTimeElementFlagsClientError(s) | Self::SplitRemovalBytesClientError(s) | Self::ClientReturnedNonClientError(s) | Self::PathNotFoundInCacheForEstimatedCosts(s) | Self::NotSupported(s) + | Self::BidirectionalReferenceRule(s) => { s.push_str(", "); s.push_str(append.as_ref()); } _ => {} }grovedb/src/element/constructor.rs (3)
94-102: Fix typo in documentation.The documentation comment has a typo: "with flags and that allows" should be "with flags that allows".
Apply this diff to fix the documentation:
- /// Set element to an item with flags and that allows for a backwards + /// Set element to an item with flags that allows for a backwards
110-115: Fix typo in documentation.The documentation comment has a typo: "sum item hat allows" should be "sum item that allows".
Apply this diff to fix the documentation:
- /// Set element to a sum item hat allows for backwards references without + /// Set element to a sum item that allows for backwards references without
123-130: Fix typo in documentation.The documentation comment has a typo: "sum item hat allows" should be "sum item that allows".
Apply this diff to fix the documentation:
- /// Set element to a sum item hat allows for backwards references with flags + /// Set element to a sum item that allows for backwards references with flagsnode-grove/src/converter.rs (4)
44-48: Consider improving the import organization.The imports are split into two
usestatements. Consider combining them for better readability.Apply this diff to combine the imports:
-use crate::{ - element::Element, reference_path::ReferencePathType, util::TxRef, GroveDb, TransactionArg, -}; -use crate::{ - bidirectional_references::BidirectionalReference, operations::proof::util::hex_to_ascii, -}; +use crate::{ + bidirectional_references::BidirectionalReference, + element::Element, + operations::proof::util::hex_to_ascii, + reference_path::ReferencePathType, + util::TxRef, + GroveDb, + TransactionArg, +};
60-69: Fix spacing in string literal.There's an extra space after the colon in the string literal.
Apply this diff to fix the spacing:
- drawer.write(b"item_with_backwards_references :")?; + drawer.write(b"item_with_backwards_references: ")?;
79-87: Remove unnecessary comma in format string.There's an unnecessary trailing comma in the format string.
Apply this diff to remove the comma:
- drawer.write(format!("sum_item_with_backwards_references: {value}",).as_bytes())?; + drawer.write(format!("sum_item_with_backwards_references: {value}").as_bytes())?;
155-157: Consider expanding the visualization of bidirectional references.The visualization for bidirectional references is minimal compared to other variants. Consider adding more details like forward reference path and cascade settings.
Apply this diff to enhance the visualization:
- Element::BidirectionalReference(..) => { - drawer.write(b"bidi ref")?; + Element::BidirectionalReference(bidi_ref) => { + drawer.write(b"bidirectional reference: ")?; + drawer.write(format!("[forward: {}, cascade: {}]", + bidi_ref.forward_reference_path, + bidi_ref.cascade_on_update + ).as_bytes())?;grovedb/src/element/mod.rs (2)
46-48: Consider using more specific imports.The current import brings in multiple items from the crate root. Consider using more specific paths.
Apply this diff to make imports more specific:
-use crate::{ - bidirectional_references::BidirectionalReference, operations::proof::util::hex_to_ascii, -}; +use crate::bidirectional_references::BidirectionalReference; +use crate::operations::proof::util::hex_to_ascii;
178-195: Address TODO comment in Display implementation.There's a TODO comment about printing backward references that should be addressed.
Would you like me to help implement the backward references printing functionality?
grovedb/src/visualize.rs (2)
60-69: Consider reusing visualization logic.The visualization logic for
ItemWithBackwardsReferencesis identical toItem. Consider extracting common logic to reduce duplication.Extract the common visualization logic into a helper method:
impl Element { fn visualize_item<W: Write>( value: &[u8], flags: &Option<ElementFlags>, drawer: Drawer<W> ) -> Result<Drawer<W>> { let mut drawer = drawer; drawer = value.visualize(drawer)?; if let Some(f) = flags { if !f.is_empty() { drawer = f.visualize(drawer)?; } } Ok(drawer) } }Then use it in both places:
- Element::ItemWithBackwardsReferences(value, flags) => { - drawer.write(b"item_with_backwards_references :")?; - drawer = value.visualize(drawer)?; - - if let Some(f) = flags { - if !f.is_empty() { - drawer = f.visualize(drawer)?; - } - } - } + Element::ItemWithBackwardsReferences(value, flags) => { + drawer.write(b"item_with_backwards_references: ")?; + drawer = Self::visualize_item(value, flags, drawer)?; + }
79-87: Consider reusing visualization logic.Similar to the previous comment, the visualization logic for
SumItemWithBackwardsReferencesis identical toSumItem. Consider extracting common logic.Extract the common visualization logic into a helper method:
impl Element { fn visualize_sum_item<W: Write>( value: &SumValue, flags: &Option<ElementFlags>, drawer: Drawer<W> ) -> Result<Drawer<W>> { let mut drawer = drawer; drawer.write(format!("{value}").as_bytes())?; if let Some(f) = flags { if !f.is_empty() { drawer = f.visualize(drawer)?; } } Ok(drawer) } }storage/src/storage.rs (1)
496-504: Verify the implications of overwriting operations during merge.The new
merge_overwritingmethod extends batch merging functionality by prioritizing operations from the provided batch. While this can be useful, it has potential implications:
- Deletions from the provided batch will override existing operations
- Data consistency might be affected if not used carefully
Consider adding:
- Documentation about when to use this vs. regular merge
- Examples of safe usage patterns
- Warning about potential data consistency issues
grovedb/src/element/helpers.rs (1)
329-332: Consider consolidating flag handling patterns.While the flag handling for new variants is correct, there's some pattern duplication across the flag-related methods. Consider extracting the common patterns into a macro to reduce maintenance overhead.
+ macro_rules! handle_element_flags { + ($match_expr:expr) => { + match $match_expr { + Element::Tree(_, flags) + | Element::Item(_, flags) + | Element::Reference(_, _, flags) + | Element::SumTree(.., flags) + | Element::BigSumTree(.., flags) + | Element::CountTree(.., flags) + | Element::SumItem(_, flags) + | Element::CountSumTree(.., flags) + | Element::ItemWithBackwardsReferences(_, flags) + | Element::SumItemWithBackwardsReferences(_, flags) + | Element::BidirectionalReference(BidirectionalReference { flags, .. }) => flags + } + }; + }grovedb/src/debugger.rs (2)
305-306: Improved transaction handling in query execution.The transaction is now properly passed through the query execution chain, ensuring consistent transaction context.
This change improves transaction isolation by ensuring the same transaction context is used throughout the query execution.
Also applies to: 316-317, 321-325
539-545: Comprehensive handling of bidirectional references in element conversion.The
element_to_grovedbgfunction has been updated to handle both unidirectional and bidirectional references, along with their backward references variants. The pattern matching is thorough and maintains consistency with the existing reference types.The implementation ensures backward compatibility while adding support for bidirectional references. The pattern matching structure makes it easy to add new reference types in the future.
Also applies to: 554-564, 569-575, 589-598, 609-615, 626-631, 639-644, 654-659, 663-669
storage/src/rocksdb_storage/storage.rs (1)
617-618: Consistent transaction handling in batch commits.The test cases now explicitly pass the transaction context to
commit_multi_context_batch, aligning with the improved transaction handling throughout the codebase.This change ensures consistent transaction handling in tests, which helps validate the transaction isolation improvements.
Also applies to: 663-664
merk/src/merk/mod.rs (1)
286-289: Added metadata caching to improve performance.The
meta_cachefield provides in-memory caching for metadata key-value pairs, similar to how trees work in-memory until committed. This should improve performance by reducing storage access.The metadata caching aligns with the existing tree caching pattern, providing a consistent approach to performance optimization. Consider adding documentation about cache invalidation strategies and memory usage considerations.
adr/merk_cache.md (2)
1-4: Improve Compound Adjective FormattingOn line 3, the phrase "An easy to use answer to GroveDB's implementation challenges." would be clearer if the compound adjective were hyphenated. Consider changing it to "An easy-to-use answer to GroveDB's implementation challenges."
🧰 Tools
🪛 LanguageTool
[grammar] ~3-~3: It appears that two hyphens are missing.
Context: # Merk Cache An easy to use answer to GroveDB's implementation chal...(SIMPLE_TO_USE_HYPHEN)
180-188: Refine Redundancy DescriptorOn line 188, consider rephrasing for a more assertive statement. Instead of "Wrapping
Merksin UnsafeCell is somewhat redundant.", you might say:-Wrapping `Merks` in UnsafeCell is somewhat redundant. +Wrapping `Merks` in UnsafeCell is redundant.This minor refinement strengthens the statement.
🧰 Tools
🪛 LanguageTool
[style] ~188-~188: Qualifiers like “somewhat” can weaken your message and make your writing sound uncertain. Consider removing it or choosing an alternative to sound more confident.
Context: ...d. WrappingMerksinUnsafeCellis somewhat redundant. We use lifetimes to enforce...(SOMEWHAT)
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📒 Files selected for processing (49)
adr/atomicity.md(1 hunks)adr/bidirectional_references.md(1 hunks)adr/merk_cache.md(1 hunks)costs/src/context.rs(1 hunks)grovedb-version/src/lib.rs(3 hunks)grovedb-version/src/version/grovedb_versions.rs(2 hunks)grovedb-version/src/version/v1.rs(3 hunks)grovedb-version/src/version/v2.rs(3 hunks)grovedb/Cargo.toml(2 hunks)grovedb/src/batch/mod.rs(7 hunks)grovedb/src/batch/options.rs(2 hunks)grovedb/src/bidirectional_references.rs(1 hunks)grovedb/src/bidirectional_references/handling.rs(1 hunks)grovedb/src/debugger.rs(10 hunks)grovedb/src/element/constructor.rs(1 hunks)grovedb/src/element/delete.rs(0 hunks)grovedb/src/element/get.rs(4 hunks)grovedb/src/element/helpers.rs(6 hunks)grovedb/src/element/insert.rs(12 hunks)grovedb/src/element/mod.rs(5 hunks)grovedb/src/element/query.rs(11 hunks)grovedb/src/error.rs(2 hunks)grovedb/src/lib.rs(6 hunks)grovedb/src/merk_cache.rs(10 hunks)grovedb/src/operations/auxiliary.rs(1 hunks)grovedb/src/operations/delete/delete_up_tree.rs(1 hunks)grovedb/src/operations/delete/mod.rs(12 hunks)grovedb/src/operations/delete/v0.rs(1 hunks)grovedb/src/operations/delete/v1.rs(1 hunks)grovedb/src/operations/get/mod.rs(6 hunks)grovedb/src/operations/get/query.rs(20 hunks)grovedb/src/operations/insert/mod.rs(10 hunks)grovedb/src/operations/insert/v0.rs(1 hunks)grovedb/src/operations/insert/v1.rs(1 hunks)grovedb/src/operations/proof/generate.rs(8 hunks)grovedb/src/operations/proof/verify.rs(1 hunks)grovedb/src/reference_path.rs(3 hunks)grovedb/src/tests/common.rs(2 hunks)grovedb/src/tests/mod.rs(4 hunks)grovedb/src/util.rs(1 hunks)grovedb/src/util/compat.rs(1 hunks)grovedb/src/util/tx_ref.rs(1 hunks)grovedb/src/util/visitor.rs(1 hunks)grovedb/src/visualize.rs(3 hunks)merk/src/merk/mod.rs(2 hunks)merk/src/merk/open.rs(4 hunks)node-grove/src/converter.rs(2 hunks)storage/src/rocksdb_storage/storage.rs(2 hunks)storage/src/storage.rs(20 hunks)
💤 Files with no reviewable changes (1)
- grovedb/src/element/delete.rs
🧰 Additional context used
🪛 LanguageTool
adr/atomicity.md
[style] ~12-~12: ‘in the meantime’ might be wordy. Consider a shorter alternative.
Context: ...as background updates may have occurred in the meantime. To demonstrate the problem, let’s con...
(EN_WORDINESS_PREMIUM_IN_THE_MEANTIME)
[uncategorized] ~15-~15: Possible missing comma found.
Context: .... One actor updates this key with a new value while another actor performs an inserti...
(AI_HYDRA_LEO_MISSING_COMMA)
[uncategorized] ~39-~39: Possible missing comma found.
Context: ...nnot be represented by a single RocksDB operation too. Although get may be an exception...
(AI_HYDRA_LEO_MISSING_COMMA)
[grammar] ~47-~47: The plural noun “transactions” cannot be used with the article “a”. Did you mean “a transaction” or “transactions”?
Context: ...::TxRefwas introduced. TxRef` wraps a transactions provided from user if any, otherwise st...
(A_NNS)
[style] ~51-~51: This adverb was used twice in the sentence. Consider removing one of them or replacing them with a synonym.
Context: ...started internally it shall be commited internally as well, for that purpose `TxRef::commi...
(ADVERB_REPETITION_PREMIUM)
[typographical] ~52-~52: It seems that a comma is missing.
Context: ...e commited internally as well, for that purpose TxRef::commit_local is used, that wil...
(FOR_THIS_REASON_COMMA)
adr/bidirectional_references.md
[style] ~4-~4: For conciseness, consider replacing this expression with an adverb.
Context: ...e data they refer to is only guaranteed at the moment they are inserted. Subsequent updates t...
(AT_THE_MOMENT)
[uncategorized] ~113-~113: Possible missing comma found.
Context: ... from any other possible usages of meta storage and the element's key is appended. Und...
(AI_HYDRA_LEO_MISSING_COMMA)
adr/merk_cache.md
[grammar] ~3-~3: It appears that two hyphens are missing.
Context: # Merk Cache An easy to use answer to GroveDB's implementation chal...
(SIMPLE_TO_USE_HYPHEN)
[style] ~188-~188: Qualifiers like “somewhat” can weaken your message and make your writing sound uncertain. Consider removing it or choosing an alternative to sound more confident.
Context: ...d. Wrapping Merks in UnsafeCell is somewhat redundant. We use lifetimes to enforce...
(SOMEWHAT)
🪛 markdownlint-cli2 (0.17.2)
adr/atomicity.md
18-18: Fenced code blocks should have a language specified
null
(MD040, fenced-code-language)
adr/bidirectional_references.md
136-136: Fenced code blocks should have a language specified
null
(MD040, fenced-code-language)
🪛 GitHub Check: clippy
grovedb/src/operations/insert/v0.rs
[warning] 12-21: this function has too many arguments (8/7)
warning: this function has too many arguments (8/7)
--> grovedb/src/operations/insert/v0.rs:12:1
|
12 | / pub(super) fn insert_on_transaction<'db, 'b, B: AsRef<[u8]>>(
13 | | db: &GroveDb,
14 | | path: SubtreePath<'b, B>,
15 | | key: &[u8],
... |
20 | | grove_version: &GroveVersion,
21 | | ) -> CostResult<(), Error> {
| |__________________________^
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#too_many_arguments
grovedb/src/operations/delete/v0.rs
[warning] 17-33: this function has too many arguments (8/7)
warning: this function has too many arguments (8/7)
--> grovedb/src/operations/delete/v0.rs:17:1
|
17 | / pub(super) fn delete_internal_on_transaction<B: AsRef<[u8]>>(
18 | | db: &GroveDb,
19 | | path: SubtreePath,
20 | | key: &[u8],
... |
32 | | grove_version: &GroveVersion,
33 | | ) -> CostResult<bool, Error> {
| |____________________________^
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#too_many_arguments
grovedb/src/operations/insert/v1.rs
[warning] 17-26: this function has too many arguments (8/7)
warning: this function has too many arguments (8/7)
--> grovedb/src/operations/insert/v1.rs:17:1
|
17 | / pub(super) fn insert_on_transaction<B: AsRef<[u8]>>(
18 | | db: &GroveDb,
19 | | path: SubtreePath<'_, B>,
20 | | key: &[u8],
... |
25 | | grove_version: &GroveVersion,
26 | | ) -> CostResult<(), Error> {
| |__________________________^
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#too_many_arguments
grovedb/src/operations/delete/v1.rs
[warning] 19-35: this function has too many arguments (8/7)
warning: this function has too many arguments (8/7)
--> grovedb/src/operations/delete/v1.rs:19:1
|
19 | / pub(super) fn delete_internal_on_transaction<B: AsRef<[u8]>>(
20 | | db: &GroveDb,
21 | | path: SubtreePath,
22 | | key: &[u8],
... |
34 | | grove_version: &GroveVersion,
35 | | ) -> CostResult<bool, Error> {
| |____________________________^
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#too_many_arguments
⏰ Context from checks skipped due to timeout of 90000ms (1)
- GitHub Check: Code Coverage
🔇 Additional comments (127)
grovedb/src/operations/insert/v0.rs (1)
36-47: Ensure consistent error handling foradd_element_on_transactioncall.
cost_return_on_error!handles errors by accumulating costs and returning early, which is correct for avoiding partial updates. Ensure that any partial modifications in earlier steps are properly reversed or accounted for in case of errors. If a rollback mechanism is needed, it should be triggered consistently here.grovedb/src/util/visitor.rs (3)
58-69: Avoid potential memory overhead by limiting queue size or chaining logic.When
recursiveis true and many subtrees exist, the breadth-first queue (VecDeque) could become large. Consider bounding its size or implementing a depth-first approach if endless or extremely large subtrees are feasible in real usage scenarios.
[performance]
80-86: Ensure early returns handle partial traversal states robustly.If
visit_merksignals a short-circuit (true), the code immediately returns with ashort_circuited: true. Confirm that the partial traversal state (including the currentbatch) is valid and consistent. For instance, if partial changes were applied, ensure they are logically safe to commit in this scenario.
96-100: Validate edge cases for subtree references.The check
if self.recursive && value.is_any_tree()pushes a new segment to the queue. Validate that references to empty or invalid subtrees (e.g., already pruned) are handled gracefully and can't lead to unexpected indexing or panic.grovedb/src/operations/insert/v1.rs (2)
175-186: Implementation for bidirectional reference insertion looks consistent.The call to
process_bidirectional_reference_insertionintegrates well with the new element type. No immediate concerns here.
222-227: Final batch merge appears correct.The final merge into the provided storage batch is straightforward. No issues identified.
grovedb/src/operations/get/mod.rs (4)
26-26: New imports for bidirectional references and TxRef.This import is consistent with the new feature of handling bidirectional references and transaction references. No issues found.
78-86: Use of TxRef throughout get operations looks correct.Wrapping the transaction in
TxRefand passingSome(tx.as_ref())is a coherent approach that simplifies transaction management and ensures consistent usage.Also applies to: 99-99
111-115: Signature change to require &Transaction instead of TransactionArg.Changing
follow_referenceto accept a concrete&Transactionrather than aTransactionArgmay break external code if it depended on the old signature. Verify that public-facing APIs and dependent crates are unaffected.
167-171: Unified reference pattern for standard and bidirectional references.Merging these variants into the same match arm maintains consistent resolution logic for both reference types. This is a neat approach to reduce redundancy.
grovedb/src/operations/proof/generate.rs (3)
24-24: Importing Transaction for proof generation is straightforward.This minor addition aligns with the introduction of transaction-scoped proofs. No concerns here.
122-122: Ensure proper handling of transaction lifecycle within proof logic.Starting a transaction here is fine, but confirm that this transaction is committed or closed once proof generation completes. An unclosed transaction could lead to resource leaks or inconsistent states.
137-137: Consistent use of &tx across downstream proof methods.Passing the active transaction reference to calls like
query_rawandprove_subqueriesensures consistent transactional context during proof generation. Implementation appears cohesive.Also applies to: 153-153, 167-167, 169-169
grovedb/src/operations/delete/v0.rs (2)
71-80: Tree-deletion logic appears correct.The condition cleanly distinguishes between returning an error versus returning
falsewhen deleting non-empty trees is disallowed. This aligns well with the typical patterns for “safe” deletion. Overall, it provides the needed flexibility based on user options.
204-234: Efficient BFS approach for subtree discovery.The
find_subtreesfunction correctly traverses subtrees and accumulates them. For large data sets, consider the memory usage and whether short-circuiting is needed. Otherwise, this BFS logic looks solid.grovedb/src/operations/delete/v1.rs (3)
66-92: Good use of a separate batch for recursive deletions.Splitting recursive subtree deletions into a dedicated
deletion_batchneatly isolates concerns. It also provides a clean merge step at the end, ensuring that all interim changes are accumulated properly.
141-181: Backward references propagation logic looks solid.Propagating bidirectional references only when
propagate_backward_referencesis set is a clear approach that cleanly separates high-cost reference updates from simpler deletions. This design strikes a good balance between performance and correctness.
204-283: Visitor design for recursive subtree deletion.Using
DeletionVisitorto handle BFS/DFS for large trees without building each Merk is efficient. The short-circuited approach to handling subtrees is also a sensible optimization for partial deletions. Keep an eye on potential reentrancy if future features require deeper recursion.grovedb/src/merk_cache.rs (3)
18-25: Use of enumSubtreeeffectively decouples states.Defining
LoadedMerkvs.Deletedprovides a clear representation of the subtree’s status in the cache. This is a strong design choice, especially given the recent addition of bidirectional references, where partially deleted states can arise.
59-81: Double-borrow check is prudent.The explicit panic if the borrow flag is currently set ensures memory safety with
UnsafeCell. This approach helps avoid subtle concurrency or re-entrancy errors in the cache, though it means the borrowing code must be cautious. This is acceptable given the complexity of caching Merks.Would you like more robust testing for potential edge cases around partial commits or re-injections?
363-407: Borrow-flag approach to prevent overlapping mutable borrows is robust.The
for_merkmethod’s panic on double borrow upholds Rust’s aliasing rules even within anUnsafeCellcontext. This is a well-structured solution in line with your documented “rule of thumb” guidance to avoid nestedfor_merkcalls.grovedb/src/element/insert.rs (14)
21-30: Implementation ofhas_changedlooks correct
The logic accurately compares presence and equality for old/new values. This is straightforward and clear.
46-49: Consistency with version dispatch
Usingdispatch_version!aligns with the pattern seen elsewhere. No issues detected.
218-254: Insert only if changed
This method calculates aDelta, checks if there is a change, and conditionally performs the insertion. The approach is coherent, and returning theDeltais helpful for tracking old and new values.
307-423: Reference insertion conditional check
insert_reference_if_changed_valuemirrors the logic ininsert_if_changed_valuebut applies to references. The flow is consistent, and the code is readable.
458-511:insert_subtree
Creating a layered reference with specialized cost logic is consistent with the rest of the code. No immediate concerns noted.
513-597:insert_subtree_if_changed
Similar to the other “if_changed” methods, returns aDeltaand performs the insertion only if there’s a meaningful overwrite. The implementation is consistent.
648-648: Test condition
#[cfg(feature = "minimal")]at test module scope might skip tests if this feature is disabled. Verify this is intentional.
693-694: Creating a new item for test
Definingelementbefore callinginsert_if_changed_valueclarifies test readiness. This minor addition is sound.
702-702: Ensuring no change detected
assert!(!delta.has_changed())properly verifies the unchanged scenario, improving test coverage.
715-716: Explicit transaction start
Starting a transaction beforeempty_path_merkshows clear intention for test isolation. Looks good.
742-742: Old value assertion
assert_eq!(delta.old, Some(Element::new_item(b"value".to_vec())))verifies previous state accurately.
745-748: Commit and read
Callingcommit_multi_context_batchthen reading from a read-only Merk ensures correctness of persistent state.
766-767: Creating new item in test
AssigningElement::new_item(b"value2".to_vec())is straightforward and clarifies the updated scenario.
772-773: Verifying insertion with no old value
Checkingdelta.oldisNoneconfirms correct “previously absent” logic ininsert_if_changed_value.grovedb/src/lib.rs (4)
130-130: New module inclusion
mod bidirectional_references;integrates the references subsystem. This is aligned with the PR objectives.
163-164: Conditional import ofBidirectionalReference
Including it under#[cfg(feature = "minimal")]matches the pattern for feature-gated integrations.
455-455: Root key extraction
Chaining.map_ok(|merk| merk.root_key())simplifies the code flow. No issues detected.
1003-1006: Extended element variants
Support forItemWithBackwardsReferencesandSumItemWithBackwardsReferencesis used in the verification step. Logic looks consistent with new reference handling.grovedb/src/operations/delete/mod.rs (18)
3-4: Versioned delete modules
Splitting intov0andv1modules provides flexibility for evolving deletion strategies.
14-14: Using BTreeSet
This data structure choice is appropriate for tracking unique keys in the upcoming logic.
21-21: Selective storage removal imports
BringingBasicStorageRemovalinto scope is consistent with partial removal logic.
25-25: Explicit import ofMaybeTree
Indicates support for subtrees or items, reflecting a consistent approach to dynamic element types.
27-27: ImportingMerkErrorandMerkOptions
Shows that the delete operations can handle specialized Merk configurations.
30-30: Extended storage references
UsingStorageBatchaligns with the iterative approach for multiple deletions.
33-33:TxRefbridging
TxRefis used consistently here, maintaining transaction scope across operations.
52-52: Introducingpropagate_backward_referencesinClearOptions
Enabling cascade deletions is a key new feature that aligns with bidirectional references.
62-62: Defaultingpropagate_backward_referencesto false
Ensures backward reference deletion remains opt-in, avoiding unexpected cascades.
79-79:propagate_backward_referencesinDeleteOptions
Provides a consistent mechanism for controlling cascades during deletion.
91-91: Retaining a safe default
propagate_backward_referencesremains false unless explicitly enabled, preventing accidental chain deletions.
121-123: No-op version dispatch
Similar approach as elsewhere: versions 0 and 1 share the same high-level deletion logic.
177-184: Partial commit if subtree cleared
This flow ensures we only finalize the transaction if the subtree was actually removed, preventing partial states.
198-224:clear_subtree_with_costsversion dispatch
Both versions are dispatched properly. The fallback tov1for advanced logic is aligned with the multi-version approach.
549-580:delete_internal_on_transactiondispatch
Routing tov0orv1is consistent with the rest of the codebase’s versioning pattern.
587-595: Test imports for references
Importingmake_tree_with_bidi_referencesandEMPTY_PATHexpands test scenarios to cover backward references.
1317-1351: Test:delete_item_with_backward_references
Ensures that a single item deletion triggers cascade references removal whenpropagate_backward_referencesis true. This improves coverage of new logic.
1352-1409: Test:recursive_deletion_with_bidirectional_references
Validates multi-level reference chains. The approach thoroughly checks that references outside and within the deletion scope are handled properly.grovedb/src/reference_path.rs (1)
580-592: Re-check the cyclic reference detection logic.While returning
Err(Error::CyclicReference)upon detecting a re-visited path is correct, ensure that the visited set truly captures all reference states and that no other edge cases allow unbounded reference traversal or partial state corruption.grovedb/src/element/query.rs (1)
312-329: Verify correctness of the newTxRefusage.Here,
TxRefis introduced to handle transactions more explicitly. Ensure that any transaction commits or rollbacks outside this block still respect the same references, avoiding stale or overlapping transactions.grovedb/src/bidirectional_references/handling.rs (1)
109-286: Validate the single backward-reference rule inprocess_bidirectional_reference_insertion.The logic enforces only one backward reference for a single
BidirectionalReference. Ensure that any future expansions (e.g., allowing multiple references) will not break the current path or require major refactors.grovedb/src/operations/insert/mod.rs (3)
19-19: Good usage ofdispatch_version.This import aligns with the new versioned dispatch mechanism, ensuring the code remains scalable and maintainable.
52-52: Sensible default forpropagate_backward_references.Defaulting to
falsehelps control extra overhead from backward references. Make sure to emphasize this behavior in user-facing docs for clarity.
2243-2275: Excellent coverage for unsupported backward references.This test ensures backward-reference propagation fails gracefully when unsupported. You could expand it by verifying that other data remains unaffected or by confirming error messages for clarity.
grovedb/src/operations/get/query.rs (3)
14-15: Imports align with backward-reference handling and transaction referencing.These additions correctly integrate
TxRef,BidirectionalReference, and theTransactionstruct. No issues noted.Also applies to: 17-17, 21-21
190-190: Verify parameter updates for&Transaction.Switching from
TransactionArgto a direct&Transactionclarifies usage but verify no call sites rely on automatically handlingNonetransactions.
207-241: Expanded pattern matching for bidirectional references.Your logic cleanly handles both
Element::ReferenceandElement::BidirectionalReference. Good job ensuring fallback errors for invalid queries.Also applies to: 247-249
grovedb/src/batch/mod.rs (8)
74-74: Import ofBidirectionalReferencelooks consistent.The added import integrates bidirectional references into the batch logic, aligning with the new functionality.
1000-1003: Extended match arms for backward-reference items.Great job handling
ItemWithBackwardsReferencesandSumItemWithBackwardsReferenceshere, ensuring the logic properly includes these new variants in the value-hash computation.
1009-1016: Match arm for bidirectional references.Including
BidirectionalReferencealongsideReferenceis a sensible approach. Please verify thoroughly that cases involving indirect references and maximum hop checks are tested for edge scenarios (e.g., zero or minimal hops).
1088-1091: Same handling for backward-reference items.This snippet repeats logic similar to lines 1000-1003 for processing items with backward references. The approach is consistent; no new concerns.
1138-1144: Identical handling for bidirectional references.These arms duplicate the logic in lines 1009-1016. The uniform approach to referencing is good; no further issues here.
1182-1188: Repeat of bidirectional reference match arms.Same comment as lines 1009-1016 and 1138-1144: the consistent addition of bidirectional reference logic looks fine.
1333-1338: Insertion of handling for references and bidirectional references.Again, this is aligned with the existing pattern. No additional concerns.
1407-1410: Added match arms for new backward-reference items.Matches the earlier additions for
ItemWithBackwardsReferencesandSumItemWithBackwardsReferences. No issues.grovedb/src/util.rs (2)
2-3: New module definitions (tx_refandvisitor).Creating separate modules clarifies responsibilities and is a clean structuring choice.
5-6: Re-exportingTxRefand visitor traits.Re-exporting these items ensures convenient access across the codebase without cluttering the main utility file. Looks good.
grovedb/src/bidirectional_references.rs (8)
1-2: Module-level documentation for bidirectional references.Clear initial comments explaining the purpose of bidirectional references. This is helpful for maintainers.
3-8: Feature-gated handling module reference.The approach of separating "implementation details" from definitions under a feature gate (“minimal”) is a sensible organization strategy.
9-11: Use ofbincodeand conditional exports.Good practice using
bincodefor efficient serialization and gatinghandlinglogic with theminimalfeature.
13-13: Imports for reference types and flags.Importing
MaxReferenceHopandReferencePathTypehere is straightforward and aligns with the module’s focus.
15-15: Definition ofMETA_BACKWARD_REFERENCES_PREFIX.Defining a clear byte prefix for backward references helps keep references well-organized. No issues here.
17-17: New type aliasSlotIdx.Using
usizefor slot indexing is reasonable, though keep in mind potential range considerations on different platforms.
19-21: NewCascadeOnUpdatetype alias.A boolean allows straightforward checks, but an enum might be more expressive. Still, the doc clarifies usage.
23-32:BidirectionalReferencestruct definition.Clear fields for handling forward path, backward slot, cascade behavior, max hop, and optional flags. Serialization with
bincodeis well-defined. Overall, looks solid.grovedb/src/operations/auxiliary.rs (1)
38-38: LGTM! Clean and well-structured auxiliary operations.The code demonstrates good practices with proper error handling, cost tracking, and transaction management.
grovedb/src/util/compat.rs (1)
1-12: Excellent documentation of the compatibility module!The documentation clearly explains the module's purpose and importance for maintaining API consistency.
grovedb/src/tests/common.rs (1)
47-53: Great documentation of the reference chain structure!The comments clearly explain the complex bidirectional reference setup, making it easier to understand the test scenario.
grovedb-version/src/lib.rs (3)
24-40: LGTM! Well-structured version check macro.The new
check_grovedb_v1_with_costmacro follows the same pattern as the v0 version, maintaining consistency in error handling and cost tracking.
74-97: LGTM! Excellent version dispatching macro.The
dispatch_versionmacro provides a clean and flexible way to handle multiple versions with proper error handling and cost tracking. The use of meta variables ($($version_num)|+) allows for elegant pattern matching.
63-63: LGTM! Fixed error module resolution.The addition of
$crate::prefix ensures proper error module resolution in macro expansion.merk/src/merk/open.rs (1)
25-25: LGTM! Consistent meta_cache initialization.The meta_cache field is properly initialized with Default::default() across all open_* methods, maintaining consistency in the Merk struct initialization.
Also applies to: 45-45, 67-67, 90-90
grovedb/src/error.rs (2)
62-64: LGTM! Well-defined error variant for bidirectional references.The BidirectionalReferenceRule error variant with String parameter allows for detailed error messages.
99-100: LGTM! Clear error variant for deleted subtrees.The MerkCacheSubtreeDeleted error variant with &'static str parameter is appropriate for static error messages.
costs/src/context.rs (1)
152-161: LGTM! Clean utility method for cost wrapping.The wrap_cost_ok method provides a convenient way to wrap values into CostResult with default costs, reducing boilerplate code.
grovedb-version/src/version/v1.rs (1)
42-42: LGTM! New version fields are correctly initialized.The new fields for bidirectional references feature are consistently added and initialized with version 0, indicating they are new features in v1.
Also applies to: 53-53, 77-78
grovedb-version/src/version/v2.rs (1)
51-52:✅ Verification successful
Verify the version increments.
Several features have been incremented to version 1, indicating breaking changes:
insert_if_changed_valueinsertandinsert_on_transactionclear_subtreedelete_internal_on_transactionaverage_case_merk_replace_treeadd_average_case_merk_propagateandsum_tree_estimated_sizePlease ensure that these version increments are intentional and that all dependent code is updated to handle these breaking changes.
Run the following script to verify the version usage:
Also applies to: 96-97, 105-105, 110-110, 149-149, 191-192
🏁 Script executed:
#!/bin/bash # Description: Search for usage of the versioned features to ensure they handle the version changes. # Test: Search for feature usage. Expect: Version checks in place. rg -A 5 $'insert_if_changed_value|insert_on_transaction|clear_subtree|delete_internal_on_transaction|average_case_merk_replace_tree|add_average_case_merk_propagate|sum_tree_estimated_size'Length of output: 45467
Subject: Version Increments Verified and Consistent
The search confirms that the new version numbers in v2 (e.g.
insert_if_changed_value,insert_on_transaction,clear_subtree,delete_internal_on_transaction,average_case_merk_replace_tree,add_average_case_merk_propagate, andsum_tree_estimated_size) have been updated as intended and are correctly referenced across the codebase. All dependent code appears to be handling the breaking changes according to the new version settings.
- v2 Changes:
insert_if_changed_valueis now set to 1.insert_on_transactionand related insert operations reflect the version update.- Deletion operations have updated versions for
clear_subtreeanddelete_internal_on_transaction.- The average-case operations (
average_case_merk_replace_tree,add_average_case_merk_propagate, andsum_tree_estimated_size) have been incremented as expected.Please ensure that integration tests and documentation are updated accordingly.
grovedb-version/src/version/grovedb_versions.rs (1)
51-51: LGTM! Version structures are correctly defined.The new fields for bidirectional references feature are properly typed as
FeatureVersionand consistently added across version structures.Also applies to: 203-203
grovedb/src/operations/delete/delete_up_tree.rs (1)
54-54: LGTM! Backward references propagation is properly disabled by default.The
propagate_backward_referencesfield is correctly initialized tofalseto maintain backward compatibility while introducing the bidirectional references feature.grovedb/src/element/constructor.rs (1)
81-86: LGTM! Clear and consistent method signature.The method follows the established pattern for constructor methods in this file, with appropriate documentation and a clear return type.
grovedb/src/element/mod.rs (3)
39-40: LGTM! Clear and appropriate visibility.The
pub(crate)visibility forDeltais appropriate as it's used internally within the crate.
145-151: LGTM! Well-documented enum variants.The new variants are well-documented and follow the established pattern of the enum.
292-294: LGTM! Consistent type string representations.The type string representations are consistent with the established pattern and match the documentation.
grovedb/src/operations/proof/verify.rs (1)
347-351: LGTM! The Element match arms are correctly extended.The changes appropriately handle the new Element variants for bidirectional references in the proof verification logic, maintaining consistency with the existing error handling for non-Tree elements.
grovedb/src/element/get.rs (3)
189-193: LGTM! Cost calculation is correctly applied to new Element variants.The storage cost calculation for basic items and references is appropriately extended to handle
ItemWithBackwardsReferencesandBidirectionalReferencevariants.
201-202: LGTM! SumItem cost calculation is correctly extended.The storage cost calculation for sum items is appropriately extended to handle the
SumItemWithBackwardsReferencesvariant, maintaining consistency with the existingSumItemhandling.
277-280: LGTM! V1 implementation correctly handles new Element variants.The v1 implementation of storage cost calculation is appropriately updated to handle all new Element variants, maintaining consistency with the v0 implementation.
Also applies to: 289-289
grovedb/src/element/helpers.rs (3)
186-195: LGTM! Root key modification is correctly implemented.The new
set_root_keymethod properly handles root key modification for all tree variants. The implementation is clean and maintains consistency.
312-314: LGTM! Flag access is correctly extended to new variants.The
get_flagsmethod is appropriately updated to handle flags for new Element variants, maintaining consistent access patterns.
348-350: LGTM! Mutable flag access is correctly implemented.The
get_flags_mutmethod is appropriately updated to handle mutable flag access for new Element variants, maintaining consistency with immutable access patterns.grovedb/src/debugger.rs (1)
35-35: LGTM! Import of BidirectionalReference.The import is correctly added to support the new bidirectional reference functionality.
merk/src/merk/mod.rs (2)
40-40: LGTM! Addition of meta module.The new module is correctly added to support metadata handling functionality.
48-48: Updated collections import for metadata caching.The import has been updated to include
HashMapwhile maintaining other necessary collection types.grovedb/src/tests/mod.rs (2)
4097-4203: Well-structured test for bidirectional references!The test effectively validates that bidirectional references maintain consistency when the referenced data is updated, demonstrating the key advantage over regular references. The test covers the complete lifecycle including setup, verification, updates, and final state checks.
4205-4238: Good test for breaking change in GROVE_V2!The test clearly demonstrates the behavioral difference between GROVE_V1 and GROVE_V2 regarding subtree references, effectively documenting and validating this breaking change.
grovedb/Cargo.toml (1)
37-37: LGTM: bitvec dependency added correctly!The bitvec dependency is properly added as optional and included in the minimal feature set, which aligns with its usage for bidirectional references implementation.
Also applies to: 61-61
adr/atomicity.md (1)
1-91: Excellent ADR on atomicity implementation!The document provides a comprehensive explanation of atomicity in GroveDB, clearly describing the challenges and solutions at different levels. The introduction of TxRef and the distinction between RocksDB and GroveDB batches is well documented.
🧰 Tools
🪛 LanguageTool
[style] ~12-~12: ‘in the meantime’ might be wordy. Consider a shorter alternative.
Context: ...as background updates may have occurred in the meantime. To demonstrate the problem, let’s con...(EN_WORDINESS_PREMIUM_IN_THE_MEANTIME)
[uncategorized] ~15-~15: Possible missing comma found.
Context: .... One actor updates this key with a new value while another actor performs an inserti...(AI_HYDRA_LEO_MISSING_COMMA)
[uncategorized] ~39-~39: Possible missing comma found.
Context: ...nnot be represented by a single RocksDB operation too. Althoughgetmay be an exception...(AI_HYDRA_LEO_MISSING_COMMA)
[grammar] ~47-~47: The plural noun “transactions” cannot be used with the article “a”. Did you mean “a transaction” or “transactions”?
Context: ...::TxRefwas introduced.TxRef` wraps a transactions provided from user if any, otherwise st...(A_NNS)
[style] ~51-~51: This adverb was used twice in the sentence. Consider removing one of them or replacing them with a synonym.
Context: ...started internally it shall be commited internally as well, for that purpose `TxRef::commi...(ADVERB_REPETITION_PREMIUM)
[typographical] ~52-~52: It seems that a comma is missing.
Context: ...e commited internally as well, for that purposeTxRef::commit_localis used, that wil...(FOR_THIS_REASON_COMMA)
🪛 markdownlint-cli2 (0.17.2)
18-18: Fenced code blocks should have a language specified
null(MD040, fenced-code-language)
adr/bidirectional_references.md (1)
1-170: Comprehensive ADR on bidirectional references!The document excellently explains the motivation, design, and implementation of bidirectional references. The rules and limitations are well-defined, and the meta storage approach is clearly explained with good examples.
🧰 Tools
🪛 LanguageTool
[style] ~4-~4: For conciseness, consider replacing this expression with an adverb.
Context: ...e data they refer to is only guaranteed at the moment they are inserted. Subsequent updates t...(AT_THE_MOMENT)
[uncategorized] ~113-~113: Possible missing comma found.
Context: ... from any other possible usages of meta storage and the element's key is appended. Und...(AI_HYDRA_LEO_MISSING_COMMA)
🪛 markdownlint-cli2 (0.17.2)
136-136: Fenced code blocks should have a language specified
null(MD040, fenced-code-language)
adr/merk_cache.md (10)
5-10: Clarify Cross-Reference UsageThe reference to "atomicity" is clear and concise. Just ensure that the linked document remains updated to reflect any related changes.
24-43: Clear Usage InstructionsThe "Usage" section provides a detailed explanation of how to work with a Merk tree using
MerkCache—specifically through itsget_merkmethod that returns aMerkHandle. The caution regarding nestedfor_merkcalls is particularly useful.
50-59: Subtree Deletion Section ClarityThe explanation regarding subtree deletion (using
MerkCache::mark_deleted) is concise and clear. It properly informs the reader that any subsequent retrieval will check the parent's state.
60-68: Finalization Section ReviewThe finalization process is well described, with details on how
MerkCachebuilds a storage batch viainto_batch. This aligns clearly with the intended transaction lifecycle, ensuring modifications are safely merged.
72-100: Implementation Details ExplanationThe section explaining the previous "HashMap" limitations and the rationale for adopting a
BTreeMapfor ordered storage is very informative. It gives excellent context for why the design ofMerkCachehas evolved.
107-116: MerkHandle Code Snippet ReviewThe
MerkHandlesnippet succinctly demonstrates how a raw pointer toSubtreeis used alongside aCell<bool>to manage unique borrowing dynamically. The design appears deliberate and well justified given the constraints.
137-142: CachedMerkEntry Type AliasThe
CachedMerkEntryalias is clear and serves its purpose of keeping theMerkon the heap along with its borrow flag. This design decision supports the overall caching strategy.
148-153: Merks Type Alias ClarityThe definition of the
Merkstype alias using aBTreeMapis both clear and in line with the need for ordered paths. This will aid in batch finalization and hash propagation processes.
169-177: MerkCache Structure DesignThe new
MerkCachestruct is thoughtfully designed, with clear ownership of references to the database, version, transaction, and batch. The use ofUnsafeCellfor themerksfield is an intentional choice given the need for controlled mutation through shared references.
190-198: Detailed Safety ExplanationThe detailed explanation covering why
UnsafeCellis necessary—as well as how lifetimes ensure thatMerkHandles do not outlive theMerkCache—is comprehensive and well-articulated. This section effectively communicates the safety trade-offs involved.
| Element::BidirectionalReference(..) => { | ||
| drawer.write(b"bidi ref")?; | ||
| } |
There was a problem hiding this comment.
🛠️ Refactor suggestion
Enhance bidirectional reference visualization.
The current visualization for bidirectional references is too minimal. Consider adding more details about the reference.
Apply this diff to enhance the visualization:
- Element::BidirectionalReference(..) => {
- drawer.write(b"bidi ref")?;
+ Element::BidirectionalReference(bidi_ref) => {
+ drawer.write(b"bidirectional reference: ")?;
+ drawer.write(format!(
+ "[forward: {}, cascade: {}, max_hop: {}]",
+ bidi_ref.forward_reference_path,
+ bidi_ref.cascade_on_update,
+ bidi_ref.max_hop.map_or("None".to_string(), |h| h.to_string())
+ ).as_bytes())?;
+ if let Some(f) = &bidi_ref.flags {
+ if !f.is_empty() {
+ drawer = f.visualize(drawer)?;
+ }
+ }📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| Element::BidirectionalReference(..) => { | |
| drawer.write(b"bidi ref")?; | |
| } | |
| Element::BidirectionalReference(bidi_ref) => { | |
| drawer.write(b"bidirectional reference: ")?; | |
| drawer.write(format!( | |
| "[forward: {}, cascade: {}, max_hop: {}]", | |
| bidi_ref.forward_reference_path, | |
| bidi_ref.cascade_on_update, | |
| bidi_ref.max_hop.map_or("None".to_string(), |h| h.to_string()) | |
| ).as_bytes())?; | |
| if let Some(f) = &bidi_ref.flags { | |
| if !f.is_empty() { | |
| drawer = f.visualize(drawer)?; | |
| } | |
| } | |
| } |
There was a problem hiding this comment.
Actionable comments posted: 0
🧹 Nitpick comments (5)
grovedb/src/merk_cache.rs (1)
59-81: Consider adding error handling for double deletion.The
mark_deletedmethod could benefit from additional error handling. Currently, it silently overwrites an already deleted subtree, which might mask potential logic errors.Consider adding a check and returning an error if attempting to delete an already deleted subtree:
pub(crate) fn mark_deleted(&self, path: SubtreePathBuilder<'b, B>) { let merks = unsafe { self.merks .get() .as_mut() .expect("`UnsafeCell` is never null") }; merks .entry(path) .and_modify(|subtree| { if subtree.0.get() { panic!("Attempt to have double &mut borrow on Merk"); } + if let Subtree::Deleted = subtree.1 { + return; + } subtree.1 = Subtree::Deleted }) .or_insert(Box::new((Default::default(), Subtree::Deleted))); }grovedb/src/bidirectional_references/handling.rs (4)
1-3: Enhance module documentation.The current documentation is minimal. Consider adding more comprehensive documentation that includes:
- Purpose and key features of bidirectional references
- High-level overview of the implementation
- Usage examples
- Important considerations and limitations
//! Bidirectional references handling module. //! Definitions are stored at parent for proper feature gating. +//! +//! This module implements bidirectional references in GroveDB, which allow for: +//! - Automatic updates when referenced elements change +//! - Cascade deletion support +//! - Limited backward references (up to 32 per item) +//! +//! # Example +//! ```rust +//! # use grovedb::{Element, BidirectionalReference}; +//! // Create a bidirectional reference +//! let reference = BidirectionalReference { +//! forward_reference_path: /* path to target */, +//! backward_reference_slot: 0, +//! cascade_on_update: true, +//! max_hop: None, +//! flags: None, +//! }; +//! ``` +//! +//! # Implementation Details +//! - Backward references are stored in meta storage +//! - Changes to referenced elements propagate through reference chains +//! - Deletion can be configured to cascade through references
103-280: Consider breaking down theprocess_bidirectional_reference_insertionfunction.This function is quite long (177 lines) and handles multiple responsibilities:
- Validating target element type
- Managing backward references
- Handling different overwrite scenarios
- Propagating changes
Consider splitting it into smaller, focused functions to improve maintainability and testability.
For example:
fn validate_target_element(element: &Element) -> Result<(), Error> { if !matches!( element, Element::ItemWithBackwardsReferences(..) | Element::SumItemWithBackwardsReferences(..) | Element::BidirectionalReference(..) ) { return Err(Error::BidirectionalReferenceRule( "Bidirectional references can only point variants with backward references support" .to_owned(), )); } Ok(()) } fn handle_bidirectional_reference_target( target_element: Element, target_merk: &mut MerkHandle<'_, '_>, target_key: &[u8], ) -> CostResult<CryptoHash, Error> { // ... handle bidirectional reference target logic ... } fn handle_previous_value( previous_value: Option<Element>, merk_cache: &MerkCache<'_, '_, impl AsRef<[u8]>>, merk: MerkHandle<'_, '_>, path: SubtreePathBuilder<'_, impl AsRef<[u8]>>, key: &[u8], target_node_value_hash: CryptoHash, ) -> CostResult<(), Error> { // ... handle previous value logic ... }
536-556: Improve error messages in BackwardReference serialization.The error messages in
serializeanddeserializecould be more descriptive to aid in debugging.fn serialize(&self) -> Result<Vec<u8>, Error> { let config = config::standard().with_big_endian().with_no_limit(); bincode::encode_to_vec(self, config).map_err(|e| { - Error::CorruptedData(format!("unable to serialize backward reference {}", e)) + Error::CorruptedData(format!( + "Failed to serialize backward reference. Reference: {:?}, Error: {}", + self, e + )) }) } fn deserialize(bytes: &[u8]) -> Result<BackwardReference, Error> { let config = config::standard().with_big_endian().with_no_limit(); Ok(bincode::decode_from_slice(bytes, config) - .map_err(|e| Error::CorruptedData(format!("unable to deserialize element {}", e)))? + .map_err(|e| Error::CorruptedData(format!( + "Failed to deserialize backward reference. Bytes length: {}, Error: {}", + bytes.len(), e + )))? .0) }
605-611: Document the 32-reference limitation rationale.The comment explains the implementation detail but not the rationale behind the 32-reference limit.
/// Adds backward reference to meta storage of a subtree. /// - /// Only up to 32 backward references are allowed, for that reason we use a /// bitvec to locate them. That way the bits is stored under /// [META_BACKWARD_REFERENCES_PREFIX] with key and references themselves are /// located under this prefix with index (0-31) appended. +/// +/// # Why 32 references? +/// The limit of 32 backward references was chosen because: +/// - It fits in a single u32 bitvec, making storage efficient +/// - It provides a reasonable upper bound for most use cases +/// - It helps prevent unbounded growth of reference chains +/// +/// # Performance Considerations +/// Using a bitvec for tracking reference slots provides: +/// - O(1) slot allocation +/// - Compact storage (4 bytes regardless of number of references) +/// - Fast iteration over existing references
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grovedb/src/bidirectional_references/handling.rs(1 hunks)grovedb/src/merk_cache.rs(10 hunks)
🧰 Additional context used
🧠 Learnings (1)
grovedb/src/bidirectional_references/handling.rs (1)
Learnt from: fominok
PR: dashpay/grovedb#345
File: grovedb/src/bidirectional_references/handling.rs:404-485
Timestamp: 2025-02-18T08:16:58.992Z
Learning: In GroveDB's bidirectional references implementation, the `delete_backward_references_recursively` function intentionally uses an all-or-nothing approach where the entire deletion fails if any backward reference in the chain does not have `cascade_on_update` set. This is a deliberate design choice to ensure strict consistency.
⏰ Context from checks skipped due to timeout of 90000ms (4)
- GitHub Check: Tests
- GitHub Check: Linting
- GitHub Check: Compilation errors
- GitHub Check: Code Coverage
🔇 Additional comments (7)
grovedb/src/merk_cache.rs (5)
18-26: LGTM! Well-documented enum for subtree state management.The
Subtreeenum provides a clear and type-safe way to represent the state of cached subtrees, with good documentation explaining each variant.
196-223: LGTM! Robust handling of deleted subtree reinsertions.The code properly handles the case where a deleted subtree might have been reinserted by checking the parent's data. This prevents stale deletion markers from blocking valid reinsertions.
380-408: Excellent documentation of panic conditions.The
for_merkmethod's documentation clearly explains the potential panic scenarios with nested calls, which is crucial for preventing runtime errors. The implementation properly checks for double borrowing and handles deleted subtrees.
553-619: LGTM! Comprehensive test coverage for subtree deletion and reinsertion.The test case thoroughly verifies the deletion and reinsertion workflow, ensuring that:
- Deleted subtrees are properly marked
- Attempts to access deleted subtrees fail
- Reinserted subtrees become accessible again
621-655: LGTM! Performance optimization verification.The test case effectively verifies that using cached parent data reduces storage load operations when opening subtrees, which is a key performance optimization.
grovedb/src/bidirectional_references/handling.rs (2)
693-1908: Excellent test coverage and organization.The test suite is comprehensive and well-structured:
- Covers all major functionality
- Tests edge cases and error conditions
- Clear test case descriptions
- Good use of helper functions and test data
397-479:✅ Verification successful
Verify cascade deletion behavior in
delete_backward_references_recursively.The function implements an all-or-nothing approach where the entire deletion fails if any backward reference in the chain does not have
cascade_on_updateset. Based on the retrieved learning, this is a deliberate design choice to ensure strict consistency.Run this script to verify the behavior:
🏁 Script executed:
#!/bin/bash # Description: Verify that cascade deletion is consistently enforced. # Test: Search for all usages of delete_backward_references_recursively to ensure consistent behavior. rg -A 5 $'delete_backward_references_recursively' # Test: Search for all error messages related to cascade deletion to ensure consistent messaging. rg -A 5 $'cascade_on_update'Length of output: 20032
Cascade deletion behavior in
delete_backward_references_recursivelyverifiedThe code consistently enforces an all-or-nothing deletion: if any backward reference lacks
cascade_on_update, the operation fails. The search results confirm that the error message and behavior are consistent with the intended design as documented. No modifications are necessary.
This PR introduces several new types of
Element: bidirectional reference, item and sum item that support bidirectional references pointing to them using backward references.Issue being fixed or feature implemented
This way GroveDB gets support of consistent references (and chains of references) that will receive updates in case the (in)direct pointed to element has changed.
What was done?
New
Elementvariants as well as new subsystem dedicated to reaching consistency of bidirectional references.How Has This Been Tested?
Breaking Changes
Bidirectional references are processed through
MerkCachethat in some cases reduces the costs, so a new version was used and those internals that diverged also has a bumped version to use. v1 API is unaffected.Checklist:
For repository code-owners and collaborators only
Summary by CodeRabbit
New Features
Refactor
Tests
Chores