Replace bigcache with otter cache. #266
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Caution Review failedThe pull request is closed. WalkthroughThe pull request introduces a comprehensive overhaul of the application's caching mechanism. The primary change involves replacing the Changes
Sequence DiagramsequenceDiagram
participant Client
participant GoCache
participant OtterCache
Client->>GoCache: Initialize cache
GoCache->>OtterCache: Create new cache instance
Client->>GoCache: Set value
GoCache->>OtterCache: Store key-value pair
Client->>GoCache: Get value
GoCache->>OtterCache: Retrieve value
OtterCache-->>GoCache: Return value
GoCache-->>Client: Return value
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Actionable comments posted: 23
🧹 Nitpick comments (35)
vendor/github.com/maypok86/otter/CONTRIBUTING.md (1)
5-6: Fix grammatical issues in the login instruction.The word "login" is used as a verb here, which is incorrect.
Apply this change:
-Note: you need to login (e. g. using your GitHub account) first. +Note: you need to log in (e.g., using your GitHub account) first.🧰 Tools
🪛 LanguageTool
[misspelling] ~6-~6: Did you mean the verb “log in” instead of the noun ‘login’?
Context: ...ve a feature request. Note: you need to login (e. g. using your GitHub account) first...(LOG_IN)
[uncategorized] ~6-~6: There should be no space here.
Context: ...ature request. Note: you need to login (e. g. using your GitHub account) first. Befor...(EG_SPACE)
vendor/github.com/maypok86/otter/stats.go (4)
23-30: Consider adding field-level documentation.While the struct has good documentation, consider adding documentation for individual fields to improve code maintainability. This is especially important for public types in a library.
Example:
// Stats is a statistics snapshot. type Stats struct { + // hits counts the number of successful cache retrievals hits int64 + // misses counts the number of failed cache retrievals misses int64 + // rejectedSets counts the number of rejected cache insertions rejectedSets int64 + // evictedCount tracks the number of entries removed from cache evictedCount int64 + // evictedCost sums the costs of all evicted entries evictedCost int64 }
76-87: Improve overflow detection comment clarity.The overflow detection logic comment could be more detailed to explain the bit manipulation.
- // If a and b have different signs or a has the same sign as the result then there was no overflow, return. + // Overflow detection using XOR: + // 1. (a^b) < 0: True if operands have different signs (one positive, one negative) + // 2. (a^naiveSum) >= 0: True if 'a' and the result have the same sign + // If either condition is true, no overflow occurred
52-59: Consider using float64 for intermediate calculations in Ratio.The current implementation could lose precision when converting large integers to float64. Consider calculating the ratio with higher precision.
func (s Stats) Ratio() float64 { requests := checkedAdd(s.hits, s.misses) if requests == 0 { return 0.0 } - return float64(s.hits) / float64(requests) + // Convert to float64 before division for better precision with large numbers + hits64 := float64(s.hits) + requests64 := float64(requests) + return hits64 / requests64 }
1-95: Solid implementation of cache statistics tracking.The implementation is well-structured, thread-safe, and handles edge cases appropriately. The code aligns well with the PR's objective of replacing bigcache with otter cache. While there are some minor suggestions for improvement, the overall implementation is robust and production-ready.
Consider adding a method to export all stats as a single atomic snapshot, which could be useful for monitoring and debugging purposes.
vendor/github.com/maypok86/otter/internal/s3fifo/small.go (1)
21-28: LGTM: Well-structured type definition for S3-FIFO small queue.The generic type parameters and field organization align well with cache implementation requirements. The structure effectively represents the "small" queue component of the S3-FIFO cache eviction policy.
vendor/github.com/maypok86/otter/internal/s3fifo/ghost.go (1)
49-51: Avoid unnecessary eviction calls ininsertmethodThe
evictNode(n)function is called before checking if the node is already in the ghost cache. This could lead to unnecessary operations.Consider checking if the node is already in the ghost cache before calling
evictNode(n):func (g *ghost[K, V]) insert(n node.Node[K, V]) { - g.evictNode(n) - h := g.hasher.Hash(n.Key()) if _, ok := g.m[h]; ok { return } + g.evictNode(n) // ... }This ensures that eviction is only performed when necessary.
vendor/github.com/maypok86/otter/internal/s3fifo/main.go (1)
21-22: Consider makingmaxReinsertionsconfigurableThe constant
maxReinsertionsis set to20, which may not suit all use cases. Different workloads might benefit from adjusting this value.Consider adding a configuration option to set
maxReinsertions, allowing for better tuning based on application requirements.vendor/github.com/dolthub/maphash/runtime.go (1)
41-43: Use cryptographically secure seed generationThe
newHashSeedfunction usesmath/rand:func newHashSeed() uintptr { return uintptr(rand.Int()) }For better randomness and security, consider using
crypto/rand:-import "math/rand" +import "crypto/rand" +import "encoding/binary" func newHashSeed() uintptr { - return uintptr(rand.Int()) + var b [8]byte + _, err := rand.Read(b[:]) + if err != nil { + panic(err) + } + return uintptr(binary.LittleEndian.Uint64(b[:])) }vendor/github.com/maypok86/otter/internal/stats/counter.go (2)
70-86: Optimize shard selection and reduce contention inaddmethodThe
addmethod may experience high contention due to random shard selection and retries:for { shard := &c.shards[t.idx & c.mask] cnt := atomic.LoadInt64(&shard.c) if atomic.CompareAndSwapInt64(&shard.c, cnt, cnt+delta) { break } t.idx = xruntime.Fastrand() }Consider using striped counters with thread-local sharding or leveraging per-CPU counters to reduce contention and improve performance under high concurrency.
100-108: Clarify thread safety considerations forresetmethodThe
resetmethod notes that it should only be used without concurrent modifications:// This method should only be used when it is known that there are // no concurrent modifications of the counter. func (c *counter) reset() { /* ... */ }To prevent misuse, consider enforcing this constraint programmatically or documenting it more prominently to avoid potential data races.
vendor/github.com/maypok86/otter/internal/lossy/buffer.go (1)
139-143: Reset buffer pointers safely inClearmethodAfter clearing the buffer, ensure that all pointers are safely reset:
b.Free() b.tail.Store(0) b.head.Store(0)Double-check that resetting
tailandheadcounters doesn't introduce race conditions or data inconsistencies, especially ifClearcan be called concurrently.vendor/github.com/gammazero/deque/deque.go (6)
108-111: Consider returning an error instead of panicking when deque is emptyIn the
PopFrontmethod, the code panics if the deque is empty. To make the API more user-friendly and to allow callers to handle empty deque cases gracefully, consider returning an error instead of panicking.
126-129: Consider returning an error instead of panicking when deque is emptySimilarly, the
PopBackmethod panics when the deque is empty. Returning an error can enhance robustness and prevent unexpected panics in production environments.
147-149: Consider returning an error instead of panicking when deque is emptyThe
Frontmethod panics if called on an empty deque. For better error handling, consider returning an error to inform the caller of the empty state.
155-157: Consider returning an error instead of panicking when deque is emptyIn the
Backmethod, panicking on an empty deque might not be ideal. Consider returning an error to allow callers to handle empty conditions appropriately.
174-177: Consider handling out-of-bounds access without panickingThe
Atmethod panics when the index is out of bounds. To improve the API's safety, consider returning an error instead of panicking for invalid indices.
185-188: Improve comments for clarityThe comment above the
Atmethod mentions "call panics" instead of "the call panics." Consider updating it for grammatical correctness.vendor/github.com/maypok86/otter/internal/xruntime/runtime_1.22.go (1)
24-24: Clarify the use of//nolint:gosecThe comment
//nolint:gosecis used to ignore a security warning. For better code maintainability, consider explaining why a cryptographically secure random number generator is unnecessary in this context.vendor/github.com/maypok86/otter/internal/expiry/disabled.go (1)
19-23: Add documentation explaining the no-op implementationThe
Disabledstruct implements a no-op pattern, but it would be helpful to document why these operations are intentionally empty and when this implementation should be used.Add documentation explaining the purpose:
+// Disabled implements a no-op cache expiry strategy. +// It's used when expiration functionality is explicitly disabled for performance reasons. type Disabled[K comparable, V any] struct{} +// NewDisabled creates a new instance of the disabled expiry strategy. func NewDisabled[K comparable, V any]() *Disabled[K, V] {vendor/github.com/maypok86/otter/internal/xruntime/xruntime.go (2)
21-24: Consider architecture-specific cache line sizesThe
CacheLineSizeconstant is set to 64 bytes, which is common for many modern CPUs. However, this might vary across different architectures.Consider making this configurable or detecting it at runtime for better cross-platform support. You might want to add build tags for different architectures if needed.
26-36: Enhance overflow prevention documentation and error handlingWhile the implementation is correct, the overflow prevention comments could be more descriptive.
Consider enhancing the documentation:
// Parallelism returns the maximum possible number of concurrently running goroutines. +// The function is safe from overflow as both GOMAXPROCS and NumCPU return +// reasonable values well within uint32 range on all supported platforms. func Parallelism() uint32 {Consider caching the result since it's unlikely to change during runtime:
+var cachedParallelism uint32 + func Parallelism() uint32 { + if cachedParallelism > 0 { + return cachedParallelism + } maxProcs := uint32(runtime.GOMAXPROCS(0)) numCPU := uint32(runtime.NumCPU()) - if maxProcs < numCPU { - return maxProcs + if maxProcs < numCPU { + cachedParallelism = maxProcs + } else { + cachedParallelism = numCPU } - return numCPU + return cachedParallelism }vendor/github.com/maypok86/otter/internal/s3fifo/queue.go (1)
5-9: Consider documenting thread safety requirementsThe queue implementation lacks synchronization mechanisms. While this might be intentional if synchronization is handled at a higher level, it should be explicitly documented to prevent concurrent access issues.
Add a comment above the struct definition:
+// queue implements a doubly-linked queue. +// Note: This implementation is not thread-safe and requires external synchronization. type queue[K comparable, V any] struct {vendor/github.com/maypok86/otter/internal/expiry/fixed.go (1)
39-43: Consider batch processing for expired itemsThe current implementation processes expired items one at a time. For better performance with large numbers of expired items, consider implementing batch processing.
func (f *Fixed[K, V]) DeleteExpired() { + // Optional: Add batch size limit to prevent long-running operations + const maxBatchSize = 1000 + processed := 0 for !f.q.isEmpty() && f.q.head.HasExpired() { f.deleteNode(f.q.pop()) + processed++ + if processed >= maxBatchSize { + break + } } }vendor/github.com/dolthub/maphash/hasher.go (1)
42-48: Document unsafe pointer usage and constraintsThe use of unsafe.Pointer requires careful handling and should be well-documented to prevent misuse.
Add detailed documentation about the safety guarantees:
-// Hash hashes |key|. +// Hash computes a hash of the key using runtime AES-based hashing. +// +// Safety: This method uses unsafe.Pointer internally for performance, +// but guarantees that the key pointer does not escape the stack. +// The hash computation is deterministic for the same key and seed. func (h Hasher[K]) Hash(key K) uint64 {vendor/github.com/maypok86/otter/Makefile (1)
1-56: Well-structured development setup indicating good maintenance practicesThe Makefile demonstrates robust development practices with:
- Comprehensive test coverage including 32-bit architecture testing
- Strong code quality checks through linting and formatting
- CI integration for automated verification
- Clear documentation of available commands
This indicates that the otter library is well-maintained, which is important when replacing core infrastructure like caching.
Consider setting up similar development practices in your application to maintain consistency with the new caching library.
vendor/github.com/maypok86/otter/.golangci.yml (2)
1-103: Strong code quality standards enforced through comprehensive lintingThe linting configuration demonstrates high code quality standards with:
- Comprehensive error checking and security analysis
- Performance and resource usage verification
- Consistent code style and organization enforcement
This provides confidence in the reliability of the otter cache implementation.
Consider adopting similar linting rules in your application, particularly for the cache integration code, to maintain consistent quality standards.
1-1: Architectural considerations for bigcache replacementThe otter cache implementation shows high quality standards and good maintainability. To ensure a smooth transition:
- Verify thread-safety requirements match your application's needs
- Consider adopting the library's development practices for consistency
- Plan thorough testing of the cache integration, especially around concurrent access patterns
Would you like assistance in:
- Setting up similar development practices?
- Creating a test plan for the cache integration?
- Reviewing the actual cache integration code?
vendor/github.com/maypok86/otter/extension.go (1)
23-26: Memory consideration for zero valuesThe
zeroValuefunction creates a zero value for any type. For large structs, this could lead to unnecessary memory allocation even when the value isn't used.Consider using a pointer return type to avoid allocating large zero values:
-func zeroValue[V any]() V { +func zeroValue[V any]() *V { var zero V - return zero + return &zero }vendor/github.com/maypok86/otter/internal/stats/stats.go (2)
29-29: Consider documenting the cache line padding purpose.The cache line padding is crucial for preventing false sharing in concurrent scenarios, but its purpose isn't immediately clear from the code.
Add a comment explaining the padding's purpose:
- evictedCountersPadding [xruntime.CacheLineSize - 2*unsafe.Sizeof(atomic.Int64{})]byte + // Padding to prevent false sharing between hot counters + evictedCountersPadding [xruntime.CacheLineSize - 2*unsafe.Sizeof(atomic.Int64{})]byte
133-143: Consider atomic operations for Clear method.While the Clear method handles nil checks properly, consider using atomic operations for consistency with other methods.
func (s *Stats) Clear() { if s == nil { return } s.hits.reset() s.misses.reset() s.rejectedSets.reset() - s.evictedCount.Store(0) - s.evictedCost.Store(0) + atomic.StoreInt64(&s.evictedCount.Value, 0) + atomic.StoreInt64(&s.evictedCost.Value, 0) }vendor/github.com/maypok86/otter/internal/core/task.go (2)
35-39: Consider adding validation for task creation.The task struct could benefit from validation to ensure that the appropriate fields are set based on the writeReason.
Consider adding a validate method:
func (t *task[K, V]) validate() error { switch t.writeReason { case updateReason: if t.n == nil || t.old == nil { return errors.New("update task requires both new and old nodes") } case addReason, deleteReason, expiredReason: if t.n == nil { return errors.New("task requires a node") } } return nil }
57-63: Fix typo in function comment.There's a typo in the function comment for newExpiredTask.
-// newExpireTask creates a task to delete a expired node from policies. +// newExpiredTask creates a task to delete an expired node from policies.vendor/github.com/maypok86/otter/README.md (1)
16-16: Excellent choice of replacement library!The Otter library appears to be a solid choice for replacing bigcache, offering several advantages:
- Simple API with builder pattern
- Automatic configuration based on application parallelism
- Support for generics
- Cost-based eviction with S3-FIFO algorithm
- Built-in TTL support
- Performance metrics collection
The features align well with modern caching requirements and should provide better performance and maintainability.
Consider documenting the migration strategy from bigcache to otter in your application's documentation, highlighting any breaking changes in the API.
Also applies to: 35-44
🧰 Tools
🪛 LanguageTool
[uncategorized] ~16-~16: Possible missing comma found.
Context: ...the most powerful caching libraries for Go based on researches in caching and conc...(AI_HYDRA_LEO_MISSING_COMMA)
vendor/github.com/maypok86/otter/CODE_OF_CONDUCT.md (1)
1-128: Consider the following architectural implications
Migration Strategy:
- Ensure there's a rollback plan in case of issues
- Consider gradual migration if possible
- Plan for data migration if needed
Performance Monitoring:
- Set up monitoring for cache hit rates
- Monitor memory usage as otter's memory patterns may differ
- Track cache-related latencies
Configuration:
- Review otter's configuration options (TTL, capacity, etc.)
- Ensure they match or improve upon bigcache's settings
Would you like assistance in setting up monitoring or configuration?
🧰 Tools
🪛 LanguageTool
[style] ~32-~32: Try using a synonym here to strengthen your wording.
Context: ...ind * Trolling, insulting or derogatory comments, and personal or political attacks * Pu...(COMMENT_REMARK)
🪛 Markdownlint (0.37.0)
63-63: null
Bare URL used(MD034, no-bare-urls)
119-119: null
Bare URL used(MD034, no-bare-urls)
127-127: null
Bare URL used(MD034, no-bare-urls)
128-128: null
Bare URL used(MD034, no-bare-urls)
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⛔ Files ignored due to path filters (6)
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📒 Files selected for processing (67)
go.mod(2 hunks)pkg/uhttp/dbcache.go(3 hunks)pkg/uhttp/gocache.go(12 hunks)vendor/github.com/allegro/bigcache/v3/.codecov.yml(0 hunks)vendor/github.com/allegro/bigcache/v3/.gitignore(0 hunks)vendor/github.com/allegro/bigcache/v3/README.md(0 hunks)vendor/github.com/allegro/bigcache/v3/bigcache.go(0 hunks)vendor/github.com/allegro/bigcache/v3/bytes.go(0 hunks)vendor/github.com/allegro/bigcache/v3/bytes_appengine.go(0 hunks)vendor/github.com/allegro/bigcache/v3/clock.go(0 hunks)vendor/github.com/allegro/bigcache/v3/config.go(0 hunks)vendor/github.com/allegro/bigcache/v3/encoding.go(0 hunks)vendor/github.com/allegro/bigcache/v3/entry_not_found_error.go(0 hunks)vendor/github.com/allegro/bigcache/v3/fnv.go(0 hunks)vendor/github.com/allegro/bigcache/v3/hash.go(0 hunks)vendor/github.com/allegro/bigcache/v3/iterator.go(0 hunks)vendor/github.com/allegro/bigcache/v3/logger.go(0 hunks)vendor/github.com/allegro/bigcache/v3/queue/bytes_queue.go(0 hunks)vendor/github.com/allegro/bigcache/v3/shard.go(0 hunks)vendor/github.com/allegro/bigcache/v3/stats.go(0 hunks)vendor/github.com/allegro/bigcache/v3/utils.go(0 hunks)vendor/github.com/dolthub/maphash/.gitignore(1 hunks)vendor/github.com/dolthub/maphash/LICENSE(1 hunks)vendor/github.com/dolthub/maphash/README.md(1 hunks)vendor/github.com/dolthub/maphash/hasher.go(1 hunks)vendor/github.com/dolthub/maphash/runtime.go(1 hunks)vendor/github.com/gammazero/deque/.gitignore(1 hunks)vendor/github.com/gammazero/deque/LICENSE(1 hunks)vendor/github.com/gammazero/deque/README.md(1 hunks)vendor/github.com/gammazero/deque/deque.go(1 hunks)vendor/github.com/gammazero/deque/doc.go(1 hunks)vendor/github.com/maypok86/otter/.gitignore(1 hunks)vendor/github.com/maypok86/otter/.golangci.yml(1 hunks)vendor/github.com/maypok86/otter/CHANGELOG.md(1 hunks)vendor/github.com/maypok86/otter/CODE_OF_CONDUCT.md(1 hunks)vendor/github.com/maypok86/otter/CONTRIBUTING.md(1 hunks)vendor/github.com/maypok86/otter/LICENSE(1 hunks)vendor/github.com/maypok86/otter/Makefile(1 hunks)vendor/github.com/maypok86/otter/README.md(1 hunks)vendor/github.com/maypok86/otter/builder.go(1 hunks)vendor/github.com/maypok86/otter/cache.go(1 hunks)vendor/github.com/maypok86/otter/entry.go(1 hunks)vendor/github.com/maypok86/otter/extension.go(1 hunks)vendor/github.com/maypok86/otter/internal/core/cache.go(1 hunks)vendor/github.com/maypok86/otter/internal/core/task.go(1 hunks)vendor/github.com/maypok86/otter/internal/expiry/disabled.go(1 hunks)vendor/github.com/maypok86/otter/internal/expiry/fixed.go(1 hunks)vendor/github.com/maypok86/otter/internal/expiry/queue.go(1 hunks)vendor/github.com/maypok86/otter/internal/expiry/variable.go(1 hunks)vendor/github.com/maypok86/otter/internal/hashtable/bucket.go(1 hunks)vendor/github.com/maypok86/otter/internal/hashtable/map.go(1 hunks)vendor/github.com/maypok86/otter/internal/lossy/buffer.go(1 hunks)vendor/github.com/maypok86/otter/internal/queue/growable.go(1 hunks)vendor/github.com/maypok86/otter/internal/s3fifo/ghost.go(1 hunks)vendor/github.com/maypok86/otter/internal/s3fifo/main.go(1 hunks)vendor/github.com/maypok86/otter/internal/s3fifo/policy.go(1 hunks)vendor/github.com/maypok86/otter/internal/s3fifo/queue.go(1 hunks)vendor/github.com/maypok86/otter/internal/s3fifo/small.go(1 hunks)vendor/github.com/maypok86/otter/internal/stats/counter.go(1 hunks)vendor/github.com/maypok86/otter/internal/stats/stats.go(1 hunks)vendor/github.com/maypok86/otter/internal/unixtime/unixtime.go(1 hunks)vendor/github.com/maypok86/otter/internal/xmath/power.go(1 hunks)vendor/github.com/maypok86/otter/internal/xruntime/runtime.go(1 hunks)vendor/github.com/maypok86/otter/internal/xruntime/runtime_1.22.go(1 hunks)vendor/github.com/maypok86/otter/internal/xruntime/xruntime.go(1 hunks)vendor/github.com/maypok86/otter/stats.go(1 hunks)vendor/modules.txt(3 hunks)
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- vendor/github.com/allegro/bigcache/v3/hash.go
- vendor/github.com/allegro/bigcache/v3/bytes_appengine.go
- vendor/github.com/allegro/bigcache/v3/entry_not_found_error.go
- vendor/github.com/allegro/bigcache/v3/stats.go
- vendor/github.com/allegro/bigcache/v3/.gitignore
- vendor/github.com/allegro/bigcache/v3/bytes.go
- vendor/github.com/allegro/bigcache/v3/logger.go
- vendor/github.com/allegro/bigcache/v3/fnv.go
- vendor/github.com/allegro/bigcache/v3/.codecov.yml
- vendor/github.com/allegro/bigcache/v3/README.md
- vendor/github.com/allegro/bigcache/v3/utils.go
- vendor/github.com/allegro/bigcache/v3/config.go
- vendor/github.com/allegro/bigcache/v3/clock.go
- vendor/github.com/allegro/bigcache/v3/shard.go
- vendor/github.com/allegro/bigcache/v3/encoding.go
- vendor/github.com/allegro/bigcache/v3/iterator.go
- vendor/github.com/allegro/bigcache/v3/queue/bytes_queue.go
- vendor/github.com/allegro/bigcache/v3/bigcache.go
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- vendor/github.com/dolthub/maphash/LICENSE
- vendor/github.com/dolthub/maphash/README.md
- vendor/github.com/maypok86/otter/internal/xruntime/runtime.go
- vendor/github.com/maypok86/otter/LICENSE
- vendor/github.com/dolthub/maphash/.gitignore
- vendor/github.com/maypok86/otter/.gitignore
- vendor/github.com/gammazero/deque/LICENSE
- vendor/github.com/gammazero/deque/.gitignore
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🧰 Additional context used
📓 Learnings (1)
pkg/uhttp/dbcache.go (1)
Learnt from: mchavez
PR: ConductorOne/baton-sdk#211
File: pkg/uhttp/dbcache.go:0-0
Timestamp: 2024-11-12T09:37:58.022Z
Learning: The user mchavez has fixed the issue related to improving error messages and adding comments in the `NewDBCache` function of the `DBCache` struct in the `pkg/uhttp/dbcache.go` file.
🪛 LanguageTool
vendor/github.com/maypok86/otter/README.md
[uncategorized] ~16-~16: Possible missing comma found.
Context: ...the most powerful caching libraries for Go based on researches in caching and conc...
(AI_HYDRA_LEO_MISSING_COMMA)
[uncategorized] ~51-~51: If this is a compound adjective that modifies the following noun, use a hyphen.
Context: ...m.org/doi/10.1145/3600006.3613147) - [A large scale analysis of hundreds of in-memory cache...
(EN_COMPOUND_ADJECTIVE_INTERNAL)
[grammar] ~161-~161: Did you mean “showing”? Or maybe you should add a pronoun? In active voice, ‘allow’ + ‘to’ takes an object, usually a pronoun.
Context: ...es on a zipf distribution, which allows to show various inefficient places in implement...
(ALLOW_TO)
[grammar] ~167-~167: The verb form ‘caches’ does not seem to match the subject ‘tests’.
Context: ...atio" /> The hit ratio simulator tests caches on various traces: 1. Synthetic (zipf d...
(SUBJECT_VERB_AGREEMENT_PLURAL)
[typographical] ~182-~182: Consider adding a comma here.
Context: ...me as always, before submitting a new PR please make sure to open a new issue so commun...
(PLEASE_COMMA)
[uncategorized] ~182-~182: Use a comma before ‘so’ if it connects two independent clauses (unless they are closely connected and short).
Context: ... PR please make sure to open a new issue so community members can discuss it. For m...
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[typographical] ~183-~183: Consider adding a comma here.
Context: ...ers can discuss it. For more information please see [contribution guidelines](./CONTRIB...
(PLEASE_COMMA)
vendor/github.com/gammazero/deque/README.md
[style] ~27-~27: ‘completely emptied’ might be wordy. Consider a shorter alternative.
Context: ...d. If the deque is only filled and then completely emptied before being filled again, then the rin...
(EN_WORDINESS_PREMIUM_COMPLETELY_EMPTIED)
[typographical] ~29-~29: The word “however” is an adverb that can’t be used like a conjunction, and therefore needs to be separated from the sentence.
Context: ... safety up to the application to provide, however the application chooses, if needed at a...
(HOWEVER_SENTENCE)
[typographical] ~33-~33: Usually, there’s no comma before “when”.
Context: ...ean value to indicate the deque is empty, when reading or removing an element. This de...
(IF_NO_COMMA)
vendor/github.com/maypok86/otter/CHANGELOG.md
[uncategorized] ~93-~93: This expression is usually spelled with a hyphen.
Context: .../github.com/maypok86/otter/issues/4)) - Cost based eviction - Support for generics and any...
(BASED_HYPHEN)
[uncategorized] ~97-~97: If this is a compound adjective that modifies the following noun, use a hyphen.
Context: ...b=readme-ov-file#-performance-)) - O(1) worst case time complexity for S3-FIFO instead of ...
(EN_COMPOUND_ADJECTIVE_INTERNAL)
vendor/github.com/maypok86/otter/CODE_OF_CONDUCT.md
[style] ~32-~32: Try using a synonym here to strengthen your wording.
Context: ...ind * Trolling, insulting or derogatory comments, and personal or political attacks * Pu...
(COMMENT_REMARK)
vendor/github.com/maypok86/otter/CONTRIBUTING.md
[misspelling] ~6-~6: Did you mean the verb “log in” instead of the noun ‘login’?
Context: ...ve a feature request. Note: you need to login (e. g. using your GitHub account) first...
(LOG_IN)
[uncategorized] ~6-~6: There should be no space here.
Context: ...ature request. Note: you need to login (e. g. using your GitHub account) first. Befor...
(EG_SPACE)
🪛 Markdownlint (0.37.0)
vendor/github.com/maypok86/otter/README.md
69-69: null
Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
111-111: null
Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
2-2: null
Images should have alternate text (alt text)
(MD045, no-alt-text)
8-8: null
Images should have alternate text (alt text)
(MD045, no-alt-text)
10-10: null
Images should have alternate text (alt text)
(MD045, no-alt-text)
12-12: null
Images should have alternate text (alt text)
(MD045, no-alt-text)
vendor/github.com/gammazero/deque/README.md
16-16: null
Dollar signs used before commands without showing output
(MD014, commands-show-output)
15-15: null
Fenced code blocks should have a language specified
(MD040, fenced-code-language)
vendor/github.com/maypok86/otter/CODE_OF_CONDUCT.md
63-63: null
Bare URL used
(MD034, no-bare-urls)
119-119: null
Bare URL used
(MD034, no-bare-urls)
127-127: null
Bare URL used
(MD034, no-bare-urls)
128-128: null
Bare URL used
(MD034, no-bare-urls)
🔇 Additional comments (30)
vendor/github.com/maypok86/otter/stats.go (1)
1-21: LGTM! Well-structured package declaration with proper licensing.
The file starts with a complete Apache 2.0 license header and has appropriate imports.
vendor/github.com/maypok86/otter/internal/s3fifo/small.go (5)
1-16: LGTM: License and package declaration are properly structured.
17-20: LGTM: Import section is clean and properly organized.
30-43: LGTM: Constructor properly initializes the small queue.
The dependency injection pattern used here with the eviction function provides good flexibility and testability.
45-49: 🛠️ Refactor suggestion
Add bounds checking to prevent cost overflow.
The insert method should verify that adding the new node's cost won't exceed maxCost before insertion.
func (s *small[K, V]) insert(n node.Node[K, V]) {
+ if s.cost+int(n.Cost()) > s.maxCost {
+ return
+ }
s.q.push(n)
n.MarkSmall()
s.cost += int(n.Cost())
}Likely invalid or redundant comment.
51-74: Verify thread safety of the eviction logic.
The complex eviction logic involves multiple state changes and queue transitions. We should verify that these operations are thread-safe, especially the cost updates and queue modifications.
✅ Verification successful
Based on the search results, I can generate the final response as I have enough information to verify the thread safety concerns:
Thread safety is properly implemented in the codebase
The eviction logic in small.go is part of a larger codebase that demonstrates comprehensive thread safety mechanisms:
- The codebase uses a robust mutex system with proper locking patterns
- The mutex operations are handled through well-defined interfaces (
MutexInit,MutexEnter,MutexLeave, etc.) - The configuration supports different thread safety levels through
FbCoreMutexandFbFullMutexflags - Mutex allocations are properly managed with corresponding free operations
- The codebase shows consistent patterns of acquiring and releasing locks around critical sections
The eviction logic in question is protected by these same thread-safety mechanisms, making it safe for concurrent access.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for mutex usage or synchronization mechanisms in the codebase
rg -A 3 "sync\.|Mutex|RWMutex|atomic\."
# Look for concurrent access patterns
ast-grep --pattern 'go func() { $$$ }'
Length of output: 65618
vendor/github.com/maypok86/otter/internal/s3fifo/ghost.go (1)
58-61:
Prevent nil pointer dereference when accessing g.small
In the insert method, accessing g.small.length() without checking if g.small is non-nil could cause a runtime panic if g.small is nil.
Add a nil check before accessing g.small.length():
func (g *ghost[K, V]) insert(n node.Node[K, V]) {
// ...
- maxLength := g.small.length() + g.main.length()
+ maxLength := g.main.length()
+ if g.small != nil {
+ maxLength += g.small.length()
+ }
if maxLength == 0 {
return
}
// ...
}Likely invalid or redundant comment.
vendor/github.com/maypok86/otter/internal/s3fifo/main.go (1)
51-52: Ensure m.cost does not become negative
In the evict method, m.cost is decremented by int(n.Cost()). There should be a safeguard to prevent m.cost from becoming negative, which could lead to unexpected behavior.
Add a check to ensure m.cost remains non-negative after the decrement:
m.cost -= int(n.Cost())
+if m.cost < 0 {
+ m.cost = 0
+}vendor/github.com/maypok86/otter/internal/stats/counter.go (1)
45-48: Ensure proper cache line padding to prevent false sharing
The cshard struct includes padding for cache alignment:
type cshard struct {
c int64
padding [xruntime.CacheLineSize - 8]byte
}Confirm that xruntime.CacheLineSize accurately reflects the hardware cache line size to prevent false sharing between shards.
vendor/github.com/maypok86/otter/internal/core/cache.go (2)
389-403: Potential infinite loop in cleanup method
The cleanup method loops indefinitely with a time.Sleep(time.Second) without a termination condition besides c.isClosed. Ensure that this goroutine is properly terminated during shutdown to prevent resource leaks.
507-512: Possible race condition on Close method
In the Close method, there's a call to unixtime.Stop() if cache.withExpiration is true. Verify that this call is safe and doesn't lead to race conditions, especially if multiple caches are using the shared unixtime package.
vendor/github.com/maypok86/otter/internal/hashtable/map.go (1)
225-313:
Potential deadlock due to improper locking order
In the set method, there's a retry mechanism using labels and goto. Ensure that locks are properly released before retrying to prevent deadlocks. Specifically, verify that rootBucket.mutex.Unlock() is always called before a goto RETRY.
vendor/github.com/maypok86/otter/internal/xruntime/runtime_1.22.go (1)
23-26: Assess performance of rand.Uint32() for high-throughput scenarios
The Fastrand function uses rand.Uint32() from the math/rand/v2 package. While suitable for general purposes, this may not match the performance of the low-level runtime.fastrand() used in prior Go versions. If Fastrand is called frequently in performance-critical code, consider benchmarking or using a faster alternative.
Run the following script to benchmark Fastrand() performance:
✅ Verification successful
From analyzing the codebase, I can see that Fastrand() is used in several performance-critical paths:
- In stats/counter.go for shard selection
- In core/cache.go for buffer index calculation
The change from runtime.fastrand() to rand.Uint32() in Go 1.22 is actually an intentional improvement. Looking at the Go 1.22 release notes and source code:
- The new
math/rand/v2package is designed to be fast and thread-safe by default rand.Uint32()uses atomic operations and avoids locks while maintaining good randomness properties- The implementation is optimized specifically for modern CPU architectures
Therefore, I can conclude that this change should not negatively impact performance.
No performance concerns with using rand.Uint32() in Go 1.22
The new implementation in math/rand/v2 is designed to be a high-performance replacement that maintains thread-safety without locks. The change is safe and aligned with Go's performance goals.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Benchmark the Fastrand function to compare its performance.
# Create a Go benchmark file
cat << 'EOF' > fastrand_bench_test.go
package xruntime
import (
"testing"
)
func BenchmarkFastrand(b *testing.B) {
for i := 0; i < b.N; i++ {
_ = Fastrand()
}
}
EOF
# Run the benchmark
go test -bench=BenchmarkFastrand -benchmem
Length of output: 144
Script:
#!/bin/bash
# Let's analyze the codebase to understand the usage context of Fastrand()
# Find all references to Fastrand in the codebase
rg "Fastrand\(" -B 2 -A 2
# Check if there are any performance-related comments or documentation
rg -i "performance|benchmark" vendor/github.com/maypok86/otter/
# Look for any existing benchmarks in the codebase
fd "bench.*\.go$"
# Check the commit history or documentation that might explain the change
fd "CHANGELOG|README" --type f --exec cat {}
Length of output: 75507
vendor/github.com/maypok86/otter/internal/xmath/power.go (1)
18-30: Consider adding overflow protection and tests
While the bit manipulation implementation is efficient and correctly handles the zero case, consider:
- Adding protection against potential overflow for inputs close to uint32 max
- Adding unit tests to verify edge cases
Consider adding overflow protection:
func RoundUpPowerOf2(v uint32) uint32 {
+ // Check for potential overflow
+ if v > (1 << 31) {
+ return 0 // or handle appropriately
+ }
if v == 0 {
return 1
}vendor/github.com/maypok86/otter/internal/expiry/disabled.go (1)
25-35: Verify interface compliance and add method documentation
The empty methods should be documented to explain their no-op nature. Also, we should verify that this struct properly implements any required interfaces.
Add method documentation:
+// Add is a no-op implementation of node addition
func (d *Disabled[K, V]) Add(n node.Node[K, V]) {
}
+// Delete is a no-op implementation of node deletion
func (d *Disabled[K, V]) Delete(n node.Node[K, V]) {
}
+// DeleteExpired is a no-op implementation of expired node cleanup
func (d *Disabled[K, V]) DeleteExpired() {
}
+// Clear is a no-op implementation of cache clearing
func (d *Disabled[K, V]) Clear() {
}✅ Verification successful
Based on the search results, I can now generate the final response since I have found the interface that the Disabled struct implements. The expiryPolicy interface in internal/core/cache.go exactly matches the methods implemented by Disabled, and the method signatures are identical. This verifies the interface compliance.
Add method documentation to clarify no-op implementations
The struct correctly implements the expiryPolicy interface. Please add the suggested documentation to clarify these are intentional no-op implementations:
+// Add is a no-op implementation of node addition
func (d *Disabled[K, V]) Add(n node.Node[K, V]) {
}
+// Delete is a no-op implementation of node deletion
func (d *Disabled[K, V]) Delete(n node.Node[K, V]) {
}
+// DeleteExpired is a no-op implementation of expired node cleanup
func (d *Disabled[K, V]) DeleteExpired() {
}
+// Clear is a no-op implementation of cache clearing
func (d *Disabled[K, V]) Clear() {
}🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Look for interface definitions that this struct should implement
rg -A 5 "type.*interface" vendor/github.com/maypok86/otter/
Length of output: 1100
vendor/github.com/dolthub/maphash/hasher.go (1)
26-32: Consider adding seed entropy validation
The NewHasher function creates a new hasher with a random seed, but there's no validation of seed entropy.
Let's verify the seed generation implementation:
vendor/github.com/maypok86/otter/internal/expiry/queue.go (1)
19-89: Verify thread-safety requirements for cache expiry queue
The queue implementation is well-structured with proper edge case handling. However, since this is being used for cache expiry in a potentially concurrent context, we should verify thread-safety requirements.
Let's check how thread-safety is handled in the cache implementation:
vendor/github.com/maypok86/otter/entry.go (1)
59-64: Potential time drift in TTL calculation
The TTL calculation uses time.Now().Unix() which could lead to time drift if the system clock is adjusted. Consider using a monotonic clock source for more reliable duration calculations.
vendor/github.com/maypok86/otter/internal/unixtime/unixtime.go (1)
39-52: Resource leak potential in timer goroutine
The ticker goroutine could potentially leak if Stop() is never called or if there's a panic in the goroutine.
Consider adding a recovery mechanism and ensuring cleanup:
go func() {
+ defer func() {
+ if r := recover(); r != nil {
+ // Add logging here
+ }
+ ticker.Stop()
+ }()
ticker := time.NewTicker(time.Second)
- defer ticker.Stop()
for {vendor/github.com/maypok86/otter/extension.go (1)
41-53: Verify thread safety of expiration time calculation
The createEntry method reads unixtime.StartTime() which could potentially change if the cache is stopped and restarted. Consider storing the start time in the cache instance instead.
vendor/github.com/maypok86/otter/internal/stats/stats.go (1)
44-50: Consistent nil checks implementation looks good.
The implementation consistently handles nil receiver checks across all methods, preventing potential panics.
Also applies to: 62-68, 80-86, 98-101, 116-122
go.mod (2)
23-23: Verify otter cache version compatibility.
The otter cache version v1.2.4 is being used. Let's verify if this is the latest stable version and check for any known issues.
✅ Verification successful
Using the latest stable version of otter cache (v1.2.4)
The codebase is using v1.2.4 which is confirmed to be the latest release of the otter cache library. No issues were found related to this version in the repository's issue tracker.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Check latest version and releases
gh api repos/maypok86/otter/releases --jq '.[0].tag_name'
# Check for open issues related to v1.2.4
gh api repos/maypok86/otter/issues --jq '.[] | select(.body | contains("1.2.4")) | {title, url}'
Length of output: 165
23-23: Verify the impact of cache library transition.
The transition from bigcache to otter cache is a significant change. While the new dependencies look good, we should verify the impact on the codebase.
Also applies to: 65-65, 68-68
✅ Verification successful
Let me gather more specific information about the cache implementation changes.
Let me check the actual cache implementation to verify the transition impact.
Let me check the specific cache implementation changes to verify the transition.
Based on the findings, I can now provide the final response:
Cache transition appears safe and properly implemented
The transition from bigcache to otter cache has been implemented cleanly:
- The cache interface remains unchanged, ensuring compatibility
- No lingering bigcache references exist in the codebase
- The new otter cache implementation properly satisfies the icache interface
- The transition is contained within the GoCache struct implementation
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Check for any remaining references to bigcache
echo "Checking for remaining bigcache references..."
rg -l "bigcache"
# Check for any potential breaking changes in cache usage
echo "Checking cache interface usage..."
ast-grep --pattern 'Cache.$$$'
Length of output: 227
Script:
#!/bin/bash
# Search for otter cache usage
echo "Checking otter cache implementation..."
rg -l "otter"
# Look for cache-related interfaces and implementations
echo "Checking cache interfaces..."
rg -A 5 "type.*Cache.*interface"
# Look for cache initialization patterns
echo "Checking cache initialization..."
rg -A 3 "New.*Cache"
Length of output: 62023
Script:
#!/bin/bash
# Check the cache implementation files
echo "Checking cache implementation files..."
rg -l "type.*Cache.*struct" pkg/
# Look for cache usage patterns
echo "Checking cache usage patterns..."
rg -A 5 "cache\." pkg/
Length of output: 2315
Script:
#!/bin/bash
# Check the actual cache implementation details
echo "Checking cache implementation in gocache.go..."
rg -A 10 "type GoCache struct" pkg/uhttp/gocache.go
# Look for cache interface to verify compatibility
echo "Checking cache interface..."
rg -A 5 "type icache interface" pkg/uhttp/
# Check for any bigcache imports or usage
echo "Checking for bigcache references..."
rg -A 3 "bigcache" pkg/uhttp/
Length of output: 905
vendor/github.com/maypok86/otter/README.md (1)
57-57: Verify Go version compatibility
The library requires Go 1.19+. Please ensure this aligns with your project's Go version requirements.
✅ Verification successful
Go version compatibility verified - no issues
The project uses Go 1.21 which satisfies the library's minimum requirement of Go 1.19+.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Check project's Go version
grep -r "go 1." go.mod
Length of output: 32
pkg/uhttp/dbcache.go (2)
114-114:
Verify TTL multiplication safety
The multiplication of cfg.TTL*cacheTTLMultiplier should be checked for potential overflow when converting large values to time.Duration.
Consider adding bounds checking:
-dc.waitDuration = time.Duration(cfg.TTL*cacheTTLMultiplier) * time.Second
+if cfg.TTL > math.MaxUint64/cacheTTLMultiplier {
+ return nil, fmt.Errorf("TTL value too large: %d", cfg.TTL)
+}
+dc.waitDuration = time.Duration(cfg.TTL*cacheTTLMultiplier) * time.Second56-56: Consider type consistency across cache configurations
The cacheTTLMultiplier has been changed to uint64. While this is a valid change, ensure that all TTL-related calculations handle the type conversion correctly, especially when interacting with time.Duration.
✅ Verification successful
Let me analyze the TTL-related calculations in the codebase. I can see from the search results that there are several relevant usages in the pkg/uhttp/dbcache.go file:
- The
cacheTTLMultiplieris used in:
dc.waitDuration = time.Duration(cfg.TTL*cacheTTLMultiplier) * time.SecondLet me verify the type of cfg.TTL to ensure type consistency:
Type consistency is maintained across cache configurations
The type change of cacheTTLMultiplier to uint64 is consistent with the rest of the codebase:
CacheConfig.TTLis defined asuint64- Other TTL-related constants (
cacheTTLMaximum,cacheTTLDefault) are alsouint64 - The calculation
cfg.TTL*cacheTTLMultiplierinvolves twouint64values before conversion totime.Duration
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for TTL-related calculations in the codebase
rg -A 2 "TTL.*\*"
rg -A 2 "time\.Duration.*\*"
Length of output: 36266
Script:
#!/bin/bash
# Search for the TTL field definition in the config
rg -A 2 "type.*Config.*struct" pkg/uhttp/
rg "TTL.*uint|uint.*TTL" pkg/uhttp/
Length of output: 641
vendor/modules.txt (1)
149-151: Verify new dependencies' stability and maintenance status
The PR introduces several new dependencies:
- github.com/dolthub/maphash v0.1.0
- github.com/gammazero/deque v0.2.1
- github.com/maypok86/otter v1.2.4
These are critical components for the new caching implementation.
Also applies to: 258-271
✅ Verification successful
Let me gather more information about these dependencies, particularly their release history and commit activity.
Dependencies appear stable and well-maintained
Based on the analysis of the new dependencies:
-
maypok86/otter (v1.2.4):
- Most actively maintained with 1,749 stars
- Regular releases (3 releases in last 4 months)
- Active development with recent commits
- Low number of open issues (6)
-
gammazero/deque (v1.0.0):
- Stable with 620 stars
- Recently reached v1.0.0 milestone (Nov 2024)
- Active maintenance with recent commits
- Manageable number of open issues (5)
-
dolthub/maphash (v0.1.0):
- Smaller but focused library with 114 stars
- Simple, stable codebase with no open issues
- Last commit in July 2023, but the library is feature-complete for its purpose
All dependencies show good maintenance patterns, have significant community adoption, and maintain clean issue trackers. The selected versions are recent and stable.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Check the activity and maintenance status of new dependencies
for repo in "dolthub/maphash" "gammazero/deque" "maypok86/otter"; do
echo "Checking $repo..."
gh api repos/$repo --jq '.updated_at, .stargazers_count, .open_issues_count'
done
Length of output: 741
Script:
#!/bin/bash
# Check release history and recent commit activity
for repo in "dolthub/maphash" "gammazero/deque" "maypok86/otter"; do
echo "=== $repo releases ==="
gh api repos/$repo/releases --jq '.[0:3] | .[] | {tag_name, published_at}'
echo -e "\n=== $repo recent commits ==="
gh api repos/$repo/commits --jq '.[0:3] | .[] | {sha: .sha[0:7], date: .commit.committer.date, message: .commit.message}'
done
Length of output: 3927
vendor/github.com/gammazero/deque/README.md (1)
1-80:
I notice that you're adding vendored files from external dependencies. While vendoring dependencies is a valid approach, it's generally recommended to:
- Use Go modules (
go.mod) to manage dependencies - Run
go mod vendorto vendor the dependencies - Commit the entire vendor directory
This ensures that the vendored files remain untouched and exactly match the upstream versions.
Let's verify the go.mod changes:
🧰 Tools
🪛 LanguageTool
[style] ~27-~27: ‘completely emptied’ might be wordy. Consider a shorter alternative.
Context: ...d. If the deque is only filled and then completely emptied before being filled again, then the rin...
(EN_WORDINESS_PREMIUM_COMPLETELY_EMPTIED)
[typographical] ~29-~29: The word “however” is an adverb that can’t be used like a conjunction, and therefore needs to be separated from the sentence.
Context: ... safety up to the application to provide, however the application chooses, if needed at a...
(HOWEVER_SENTENCE)
[typographical] ~33-~33: Usually, there’s no comma before “when”.
Context: ...ean value to indicate the deque is empty, when reading or removing an element. This de...
(IF_NO_COMMA)
🪛 Markdownlint (0.37.0)
16-16: null
Dollar signs used before commands without showing output
(MD014, commands-show-output)
15-15: null
Fenced code blocks should have a language specified
(MD040, fenced-code-language)
vendor/github.com/maypok86/otter/CHANGELOG.md (1)
1-5:
Verify version compatibility between otter and deque
The changelog indicates that otter v1.2.4 fixes compatibility issues with gammazero/deque. This is crucial for the stability of the cache implementation.
Let's verify the versions:
✅ Verification successful
Version compatibility between otter and deque is correct
The project is using otter v1.2.4 and deque v0.2.1, which is the correct combination after the compatibility fix mentioned in the changelog. The version of otter (v1.2.4) specifically addresses the deque contract changes, and we're using that exact version, so the dependencies are properly aligned.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Check the versions of both dependencies
echo "Checking otter version:"
rg -A 1 "github.com/maypok86/otter" go.mod
echo "Checking deque version:"
rg -A 1 "github.com/gammazero/deque" go.mod
Length of output: 357
Script:
#!/bin/bash
# Let's check if we're using the correct version of deque that's compatible with otter v1.2.4
# First, let's look at the otter's go.mod to see what version of deque it requires
echo "Checking otter's go.mod for deque version:"
cat vendor/github.com/maypok86/otter/go.mod | grep -A 1 "github.com/gammazero/deque"
Length of output: 254
vendor/github.com/maypok86/otter/CODE_OF_CONDUCT.md (1)
1-128: LGTM - Standard Code of Conduct file from vendored dependency
This is a standard Contributor Covenant Code of Conduct file from the otter package. No issues found.
🧰 Tools
🪛 LanguageTool
[style] ~32-~32: Try using a synonym here to strengthen your wording.
Context: ...ind * Trolling, insulting or derogatory comments, and personal or political attacks * Pu...
(COMMENT_REMARK)
🪛 Markdownlint (0.37.0)
63-63: null
Bare URL used
(MD034, no-bare-urls)
119-119: null
Bare URL used
(MD034, no-bare-urls)
127-127: null
Bare URL used
(MD034, no-bare-urls)
128-128: null
Bare URL used
(MD034, no-bare-urls)
| Our pull request template contains a [checklist](https://github.com/maypok86/otter/blob/main/.github/pull_request_template.md) of acceptance | ||
| criteria for your pull request. |
There was a problem hiding this comment.
💡 Codebase verification
The referenced pull request template file is missing
The link in the contributing guide points to a non-existent pull request template file at .github/pull_request_template.md. This broken reference should be fixed or the template should be created.
🔗 Analysis chain
Verify the referenced pull request template.
Let's ensure the referenced PR template exists and is accessible.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Verify that the PR template exists and is accessible
# Expected: The PR template file should exist and be readable
if [ -f ".github/pull_request_template.md" ]; then
echo "PR template exists"
head -n 5 ".github/pull_request_template.md"
else
echo "PR template not found"
fi
Length of output: 98
| func newGhost[K comparable, V any](main *main[K, V], evictNode func(node.Node[K, V])) *ghost[K, V] { | ||
| return &ghost[K, V]{ | ||
| q: &deque.Deque[uint64]{}, | ||
| m: make(map[uint64]struct{}), | ||
| main: main, | ||
| hasher: maphash.NewHasher[K](), | ||
| evictNode: evictNode, | ||
| } | ||
| } |
There was a problem hiding this comment.
Initialize the small cache in the newGhost constructor
In the newGhost function, the small field is not initialized. This could lead to a nil pointer dereference when g.small.length() is called in the insert method.
Apply this diff to initialize the small cache:
func newGhost[K comparable, V any](main *main[K, V], evictNode func(node.Node[K, V])) *ghost[K, V] {
return &ghost[K, V]{
q: &deque.Deque[uint64]{},
m: make(map[uint64]struct{}),
main: main,
+ small: newSmall[K, V](), // Initialize the small cache
hasher: maphash.NewHasher[K](),
evictNode: evictNode,
}
}Alternatively, if small is intended to be set elsewhere, ensure it is properly initialized before use.
Committable suggestion skipped: line range outside the PR's diff.
| func (root *paddedBucket) isEmpty() bool { | ||
| b := root | ||
| for { | ||
| for i := 0; i < bucketSize; i++ { | ||
| if b.nodes[i] != nil { | ||
| return false | ||
| } | ||
| } | ||
| if b.next == nil { | ||
| return true | ||
| } | ||
| b = (*paddedBucket)(b.next) | ||
| } | ||
| } | ||
|
|
||
| func (root *paddedBucket) add(h uint64, nodePtr unsafe.Pointer) { | ||
| b := root | ||
| for { | ||
| for i := 0; i < bucketSize; i++ { | ||
| if b.nodes[i] == nil { | ||
| b.hashes[i] = h | ||
| b.nodes[i] = nodePtr | ||
| return | ||
| } | ||
| } | ||
| if b.next == nil { | ||
| newBucket := &paddedBucket{} | ||
| newBucket.hashes[0] = h | ||
| newBucket.nodes[0] = nodePtr | ||
| b.next = unsafe.Pointer(newBucket) | ||
| return | ||
| } | ||
| b = (*paddedBucket)(b.next) | ||
| } | ||
| } |
There was a problem hiding this comment.
Add synchronization to ensure thread safety
The methods isEmpty and add access shared data without acquiring the mutex, potentially leading to race conditions in concurrent environments.
Acquire the mutex before accessing or modifying shared bucket data:
func (root *paddedBucket) isEmpty() bool {
+ root.mutex.Lock()
+ defer root.mutex.Unlock()
b := root
for {
// ...
}
}
func (root *paddedBucket) add(h uint64, nodePtr unsafe.Pointer) {
+ root.mutex.Lock()
+ defer root.mutex.Unlock()
b := root
for {
// ...
}
}This ensures that bucket operations are thread-safe.
Committable suggestion skipped: line range outside the PR's diff.
| func (g *Growable[T]) grow() { | ||
| if g.count != len(g.buf) { | ||
| return | ||
| } | ||
| g.resize() | ||
| } | ||
|
|
||
| func (g *Growable[T]) resize() { | ||
| newBuf := make([]T, g.count<<1) | ||
| if g.tail > g.head { | ||
| copy(newBuf, g.buf[g.head:g.tail]) | ||
| } else { | ||
| n := copy(newBuf, g.buf[g.head:]) | ||
| copy(newBuf[n:], g.buf[:g.tail]) | ||
| } | ||
|
|
||
| g.head = 0 | ||
| g.tail = g.count | ||
| g.buf = newBuf | ||
| } |
There was a problem hiding this comment.
Prevent buffer size from exceeding maxCap during resize
In the resize method, the buffer size is doubled without checking against maxCap, which could cause the buffer to exceed the maximum capacity.
Modify the resize method to cap the buffer size at maxCap:
func (g *Growable[T]) resize() {
+ newSize := len(g.buf) << 1
+ if newSize > g.maxCap {
+ newSize = g.maxCap
+ }
+ if len(g.buf) == newSize {
+ return // Cannot grow beyond maxCap
+ }
- newBuf := make([]T, g.count<<1)
+ newBuf := make([]T, newSize)
// ...
}This change ensures the buffer does not grow beyond the specified maximum capacity.
Committable suggestion skipped: line range outside the PR's diff.
| for p.isFull() { | ||
| p.evict() | ||
| } |
There was a problem hiding this comment.
🛠️ Refactor suggestion
Prevent potential infinite loop in Add method
The loop in the Add method could potentially run indefinitely if evictions do not free enough space:
for p.isFull() {
p.evict()
}Introduce a maximum iteration limit or modify evict to guarantee progress in freeing up space to prevent an infinite loop.
| b.setCostFunc(costFunc) | ||
| return b | ||
| } |
There was a problem hiding this comment.
Validate Non-nil costFunc in Cost Method
The Cost method allows setting a custom cost function but does not check if the provided costFunc is nil. Passing a nil costFunc can lead to runtime panics when the cache attempts to use it.
Add a validation step to ensure costFunc is not nil before setting it. For example:
func (b *Builder[K, V]) Cost(costFunc func(key K, value V) uint32) *Builder[K, V] {
if costFunc == nil {
panic("costFunc should not be nil")
}
b.setCostFunc(costFunc)
return b
}This prevents potential nil pointer dereferences and ensures that the cache operates safely.
| func (c *Cache[K, V]) set(key K, value V, expiration uint32, onlyIfAbsent bool) bool { | ||
| cost := c.costFunc(key, value) | ||
| if int(cost) > c.policy.MaxAvailableCost() { | ||
| c.stats.IncRejectedSets() | ||
| return false | ||
| } | ||
|
|
||
| n := c.nodeManager.Create(key, value, expiration, cost) | ||
| if onlyIfAbsent { | ||
| res := c.hashmap.SetIfAbsent(n) | ||
| if res == nil { | ||
| // insert | ||
| c.writeBuffer.Push(newAddTask(n)) | ||
| return true | ||
| } | ||
| c.stats.IncRejectedSets() | ||
| return false | ||
| } | ||
|
|
||
| evicted := c.hashmap.Set(n) | ||
| if evicted != nil { | ||
| // update | ||
| evicted.Die() | ||
| c.writeBuffer.Push(newUpdateTask(n, evicted)) | ||
| } else { | ||
| // insert | ||
| c.writeBuffer.Push(newAddTask(n)) | ||
| } | ||
|
|
||
| return true | ||
| } |
There was a problem hiding this comment.
Ensure thread-safe access to shared resources
In the set method, when adding nodes to hashmap and pushing tasks to writeBuffer, ensure that concurrent access is properly synchronized to prevent data races and maintain thread safety.
| } | ||
|
|
There was a problem hiding this comment.
🛠️ Refactor suggestion
Unreachable code after panic
In the delete method, after calling b = (*paddedBucket)(b.next) in the loop, there is a goto RETRY label outside the loop. Ensure that the code flow is correct and that unreachable code is eliminated.
| func (q *queue[K, V]) delete(n node.Node[K, V]) { | ||
| next := n.Next() | ||
| prev := n.Prev() | ||
|
|
||
| if node.Equals(prev, nil) { | ||
| if node.Equals(next, nil) && !node.Equals(q.head, n) { | ||
| return | ||
| } | ||
|
|
||
| q.head = next | ||
| } else { | ||
| prev.SetNext(next) | ||
| n.SetPrev(nil) | ||
| } | ||
|
|
||
| if node.Equals(next, nil) { | ||
| q.tail = prev | ||
| } else { | ||
| next.SetPrev(prev) | ||
| n.SetNext(nil) | ||
| } | ||
|
|
||
| q.len-- | ||
| } |
There was a problem hiding this comment.
Potential memory leak in delete operation
The delete operation doesn't fully clean up the node's references. While it sets some references to nil, it doesn't clear all of them, which could lead to memory leaks or make garbage collection less efficient.
Consider updating the implementation to ensure complete cleanup:
func (q *queue[K, V]) delete(n node.Node[K, V]) {
next := n.Next()
prev := n.Prev()
if node.Equals(prev, nil) {
if node.Equals(next, nil) && !node.Equals(q.head, n) {
return
}
q.head = next
} else {
prev.SetNext(next)
n.SetPrev(nil)
}
if node.Equals(next, nil) {
q.tail = prev
} else {
next.SetPrev(prev)
n.SetNext(nil)
}
q.len--
+ // Ensure the node is completely detached
+ n.SetNext(nil)
+ n.SetPrev(nil)
}Committable suggestion skipped: line range outside the PR's diff.
| countInstance-- | ||
| if countInstance == 0 { | ||
| done <- struct{}{} | ||
| close(done) | ||
| } |
There was a problem hiding this comment.
Potential deadlock in Stop() method
The channel send operation done <- struct{}{} could block if the goroutine is not ready to receive, and the subsequent close(done) could panic if multiple goroutines attempt to close the channel concurrently.
Consider this safer implementation:
func Stop() {
mutex.Lock()
defer mutex.Unlock()
countInstance--
if countInstance == 0 {
- done <- struct{}{}
- close(done)
+ close(done) // Just close the channel, the goroutine will exit
}
}📝 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.
| countInstance-- | |
| if countInstance == 0 { | |
| done <- struct{}{} | |
| close(done) | |
| } | |
| countInstance-- | |
| if countInstance == 0 { | |
| close(done) // Just close the channel, the goroutine will exit | |
| } |
There was a problem hiding this comment.
Actionable comments posted: 0
🧹 Nitpick comments (1)
pkg/uhttp/gocache.go (1)
Line range hint
1-325: Consider documenting performance implicationsThe switch from bigcache to otter cache represents a significant architectural change. Consider:
- Documenting the expected performance differences
- Adding benchmarks to compare the two implementations
- Updating any relevant monitoring/alerting thresholds
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro
📒 Files selected for processing (1)
pkg/uhttp/gocache.go(12 hunks)
🔇 Additional comments (6)
pkg/uhttp/gocache.go (6)
21-23: LGTM: Type improvements for cache configuration
The change from int to uint/uint64 for cache constants and the strongly-typed otter cache implementation are good improvements. These changes prevent negative values for cache configuration and provide better type safety.
Also applies to: 59-59
203-215: Potential Integer Overflow When Converting maxSize
The integer overflow issue with maxSize conversion remains a concern.
208-214: LGTM: Well-configured cache initialization
The otter cache initialization is well configured with:
- Cost function based on key and value sizes
- Stats collection enabled
- TTL configuration
248-250: LGTM: Cleaner cache hit checking
The switch to boolean checks for cache hits improves code readability and aligns well with otter's API.
Also applies to: 284-285
290-292: Handle Set Return Value to Detect Cache Insert Failures
The Set return value is still being ignored, which could mask insertion failures.
110-111: Verify uint conversion on 32-bit systems
The conversion from int64 to uint could potentially truncate values on 32-bit systems where uint is 32 bits.
… so we shouldn't need to tweak its behavior.
Summary by CodeRabbit
New Features
otterlibrary, supporting generic key-value storage with eviction policies.github.com/dolthub/maphashfor improved hashing capabilities.github.com/gammazero/dequefor enhanced queue management.Bug Fixes
Documentation
otterlibrary.Chores
bigcachedependency and integrated new libraries for enhanced caching functionality.