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cmd, core, eth, light, trie: add trie read caching layer

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Péter Szilágyi
2018-11-12 18:47:34 +02:00
parent 9a000601c6
commit 434dd5bc00
33 changed files with 1660 additions and 127 deletions
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# BigCache [![Build Status](https://travis-ci.org/allegro/bigcache.svg?branch=master)](https://travis-ci.org/allegro/bigcache) [![Coverage Status](https://coveralls.io/repos/github/allegro/bigcache/badge.svg?branch=master)](https://coveralls.io/github/allegro/bigcache?branch=master) [![GoDoc](https://godoc.org/github.com/allegro/bigcache?status.svg)](https://godoc.org/github.com/allegro/bigcache) [![Go Report Card](https://goreportcard.com/badge/github.com/allegro/bigcache)](https://goreportcard.com/report/github.com/allegro/bigcache)
Fast, concurrent, evicting in-memory cache written to keep big number of entries without impact on performance.
BigCache keeps entries on heap but omits GC for them. To achieve that operations on bytes arrays take place,
therefore entries (de)serialization in front of the cache will be needed in most use cases.
## Usage
### Simple initialization
```go
import "github.com/allegro/bigcache"
cache, _ := bigcache.NewBigCache(bigcache.DefaultConfig(10 * time.Minute))
cache.Set("my-unique-key", []byte("value"))
entry, _ := cache.Get("my-unique-key")
fmt.Println(string(entry))
```
### Custom initialization
When cache load can be predicted in advance then it is better to use custom initialization because additional memory
allocation can be avoided in that way.
```go
import (
"log"
"github.com/allegro/bigcache"
)
config := bigcache.Config {
// number of shards (must be a power of 2)
Shards: 1024,
// time after which entry can be evicted
LifeWindow: 10 * time.Minute,
// rps * lifeWindow, used only in initial memory allocation
MaxEntriesInWindow: 1000 * 10 * 60,
// max entry size in bytes, used only in initial memory allocation
MaxEntrySize: 500,
// prints information about additional memory allocation
Verbose: true,
// cache will not allocate more memory than this limit, value in MB
// if value is reached then the oldest entries can be overridden for the new ones
// 0 value means no size limit
HardMaxCacheSize: 8192,
// callback fired when the oldest entry is removed because of its expiration time or no space left
// for the new entry, or because delete was called. A bitmask representing the reason will be returned.
// Default value is nil which means no callback and it prevents from unwrapping the oldest entry.
OnRemove: nil,
// OnRemoveWithReason is a callback fired when the oldest entry is removed because of its expiration time or no space left
// for the new entry, or because delete was called. A constant representing the reason will be passed through.
// Default value is nil which means no callback and it prevents from unwrapping the oldest entry.
// Ignored if OnRemove is specified.
OnRemoveWithReason: nil,
}
cache, initErr := bigcache.NewBigCache(config)
if initErr != nil {
log.Fatal(initErr)
}
cache.Set("my-unique-key", []byte("value"))
if entry, err := cache.Get("my-unique-key"); err == nil {
fmt.Println(string(entry))
}
```
## Benchmarks
Three caches were compared: bigcache, [freecache](https://github.com/coocood/freecache) and map.
Benchmark tests were made using an i7-6700K with 32GB of RAM on Windows 10.
### Writes and reads
```bash
cd caches_bench; go test -bench=. -benchtime=10s ./... -timeout 30m
BenchmarkMapSet-8 3000000 569 ns/op 202 B/op 3 allocs/op
BenchmarkConcurrentMapSet-8 1000000 1592 ns/op 347 B/op 8 allocs/op
BenchmarkFreeCacheSet-8 3000000 775 ns/op 355 B/op 2 allocs/op
BenchmarkBigCacheSet-8 3000000 640 ns/op 303 B/op 2 allocs/op
BenchmarkMapGet-8 5000000 407 ns/op 24 B/op 1 allocs/op
BenchmarkConcurrentMapGet-8 3000000 558 ns/op 24 B/op 2 allocs/op
BenchmarkFreeCacheGet-8 2000000 682 ns/op 136 B/op 2 allocs/op
BenchmarkBigCacheGet-8 3000000 512 ns/op 152 B/op 4 allocs/op
BenchmarkBigCacheSetParallel-8 10000000 225 ns/op 313 B/op 3 allocs/op
BenchmarkFreeCacheSetParallel-8 10000000 218 ns/op 341 B/op 3 allocs/op
BenchmarkConcurrentMapSetParallel-8 5000000 318 ns/op 200 B/op 6 allocs/op
BenchmarkBigCacheGetParallel-8 20000000 178 ns/op 152 B/op 4 allocs/op
BenchmarkFreeCacheGetParallel-8 20000000 295 ns/op 136 B/op 3 allocs/op
BenchmarkConcurrentMapGetParallel-8 10000000 237 ns/op 24 B/op 2 allocs/op
```
Writes and reads in bigcache are faster than in freecache.
Writes to map are the slowest.
### GC pause time
```bash
cd caches_bench; go run caches_gc_overhead_comparison.go
Number of entries: 20000000
GC pause for bigcache: 5.8658ms
GC pause for freecache: 32.4341ms
GC pause for map: 52.9661ms
```
Test shows how long are the GC pauses for caches filled with 20mln of entries.
Bigcache and freecache have very similar GC pause time.
It is clear that both reduce GC overhead in contrast to map
which GC pause time took more than 10 seconds.
## How it works
BigCache relies on optimization presented in 1.5 version of Go ([issue-9477](https://github.com/golang/go/issues/9477)).
This optimization states that if map without pointers in keys and values is used then GC will omit its content.
Therefore BigCache uses `map[uint64]uint32` where keys are hashed and values are offsets of entries.
Entries are kept in bytes array, to omit GC again.
Bytes array size can grow to gigabytes without impact on performance
because GC will only see single pointer to it.
## Bigcache vs Freecache
Both caches provide the same core features but they reduce GC overhead in different ways.
Bigcache relies on `map[uint64]uint32`, freecache implements its own mapping built on
slices to reduce number of pointers.
Results from benchmark tests are presented above.
One of the advantage of bigcache over freecache is that you don’t need to know
the size of the cache in advance, because when bigcache is full,
it can allocate additional memory for new entries instead of
overwriting existing ones as freecache does currently.
However hard max size in bigcache also can be set, check [HardMaxCacheSize](https://godoc.org/github.com/allegro/bigcache#Config).
## HTTP Server
This package also includes an easily deployable HTTP implementation of BigCache, which can be found in the [server](/server) package.
## More
Bigcache genesis is described in allegro.tech blog post: [writing a very fast cache service in Go](http://allegro.tech/2016/03/writing-fast-cache-service-in-go.html)
## License
BigCache is released under the Apache 2.0 license (see [LICENSE](LICENSE))

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package bigcache
import (
"fmt"
"time"
)
const (
minimumEntriesInShard = 10 // Minimum number of entries in single shard
)
// BigCache is fast, concurrent, evicting cache created to keep big number of entries without impact on performance.
// It keeps entries on heap but omits GC for them. To achieve that, operations take place on byte arrays,
// therefore entries (de)serialization in front of the cache will be needed in most use cases.
type BigCache struct {
shards []*cacheShard
lifeWindow uint64
clock clock
hash Hasher
config Config
shardMask uint64
maxShardSize uint32
close chan struct{}
}
// RemoveReason is a value used to signal to the user why a particular key was removed in the OnRemove callback.
type RemoveReason uint32
const (
// Expired means the key is past its LifeWindow.
Expired RemoveReason = iota
// NoSpace means the key is the oldest and the cache size was at its maximum when Set was called, or the
// entry exceeded the maximum shard size.
NoSpace
// Deleted means Delete was called and this key was removed as a result.
Deleted
)
// NewBigCache initialize new instance of BigCache
func NewBigCache(config Config) (*BigCache, error) {
return newBigCache(config, &systemClock{})
}
func newBigCache(config Config, clock clock) (*BigCache, error) {
if !isPowerOfTwo(config.Shards) {
return nil, fmt.Errorf("Shards number must be power of two")
}
if config.Hasher == nil {
config.Hasher = newDefaultHasher()
}
cache := &BigCache{
shards: make([]*cacheShard, config.Shards),
lifeWindow: uint64(config.LifeWindow.Seconds()),
clock: clock,
hash: config.Hasher,
config: config,
shardMask: uint64(config.Shards - 1),
maxShardSize: uint32(config.maximumShardSize()),
close: make(chan struct{}),
}
var onRemove func(wrappedEntry []byte, reason RemoveReason)
if config.OnRemove != nil {
onRemove = cache.providedOnRemove
} else if config.OnRemoveWithReason != nil {
onRemove = cache.providedOnRemoveWithReason
} else {
onRemove = cache.notProvidedOnRemove
}
for i := 0; i < config.Shards; i++ {
cache.shards[i] = initNewShard(config, onRemove, clock)
}
if config.CleanWindow > 0 {
go func() {
ticker := time.NewTicker(config.CleanWindow)
defer ticker.Stop()
for {
select {
case t := <-ticker.C:
cache.cleanUp(uint64(t.Unix()))
case <-cache.close:
return
}
}
}()
}
return cache, nil
}
// Close is used to signal a shutdown of the cache when you are done with it.
// This allows the cleaning goroutines to exit and ensures references are not
// kept to the cache preventing GC of the entire cache.
func (c *BigCache) Close() error {
close(c.close)
return nil
}
// Get reads entry for the key.
// It returns an EntryNotFoundError when
// no entry exists for the given key.
func (c *BigCache) Get(key string) ([]byte, error) {
hashedKey := c.hash.Sum64(key)
shard := c.getShard(hashedKey)
return shard.get(key, hashedKey)
}
// Set saves entry under the key
func (c *BigCache) Set(key string, entry []byte) error {
hashedKey := c.hash.Sum64(key)
shard := c.getShard(hashedKey)
return shard.set(key, hashedKey, entry)
}
// Delete removes the key
func (c *BigCache) Delete(key string) error {
hashedKey := c.hash.Sum64(key)
shard := c.getShard(hashedKey)
return shard.del(key, hashedKey)
}
// Reset empties all cache shards
func (c *BigCache) Reset() error {
for _, shard := range c.shards {
shard.reset(c.config)
}
return nil
}
// Len computes number of entries in cache
func (c *BigCache) Len() int {
var len int
for _, shard := range c.shards {
len += shard.len()
}
return len
}
// Capacity returns amount of bytes store in the cache.
func (c *BigCache) Capacity() int {
var len int
for _, shard := range c.shards {
len += shard.capacity()
}
return len
}
// Stats returns cache's statistics
func (c *BigCache) Stats() Stats {
var s Stats
for _, shard := range c.shards {
tmp := shard.getStats()
s.Hits += tmp.Hits
s.Misses += tmp.Misses
s.DelHits += tmp.DelHits
s.DelMisses += tmp.DelMisses
s.Collisions += tmp.Collisions
}
return s
}
// Iterator returns iterator function to iterate over EntryInfo's from whole cache.
func (c *BigCache) Iterator() *EntryInfoIterator {
return newIterator(c)
}
func (c *BigCache) onEvict(oldestEntry []byte, currentTimestamp uint64, evict func(reason RemoveReason) error) bool {
oldestTimestamp := readTimestampFromEntry(oldestEntry)
if currentTimestamp-oldestTimestamp > c.lifeWindow {
evict(Expired)
return true
}
return false
}
func (c *BigCache) cleanUp(currentTimestamp uint64) {
for _, shard := range c.shards {
shard.cleanUp(currentTimestamp)
}
}
func (c *BigCache) getShard(hashedKey uint64) (shard *cacheShard) {
return c.shards[hashedKey&c.shardMask]
}
func (c *BigCache) providedOnRemove(wrappedEntry []byte, reason RemoveReason) {
c.config.OnRemove(readKeyFromEntry(wrappedEntry), readEntry(wrappedEntry))
}
func (c *BigCache) providedOnRemoveWithReason(wrappedEntry []byte, reason RemoveReason) {
if c.config.onRemoveFilter == 0 || (1<<uint(reason))&c.config.onRemoveFilter > 0 {
c.config.OnRemoveWithReason(readKeyFromEntry(wrappedEntry), readEntry(wrappedEntry), reason)
}
}
func (c *BigCache) notProvidedOnRemove(wrappedEntry []byte, reason RemoveReason) {
}

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// +build !appengine
package bigcache
import (
"reflect"
"unsafe"
)
func bytesToString(b []byte) string {
bytesHeader := (*reflect.SliceHeader)(unsafe.Pointer(&b))
strHeader := reflect.StringHeader{Data: bytesHeader.Data, Len: bytesHeader.Len}
return *(*string)(unsafe.Pointer(&strHeader))
}

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// +build appengine
package bigcache
func bytesToString(b []byte) string {
return string(b)
}

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package bigcache
import "time"
type clock interface {
epoch() int64
}
type systemClock struct {
}
func (c systemClock) epoch() int64 {
return time.Now().Unix()
}

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package bigcache
import "time"
// Config for BigCache
type Config struct {
// Number of cache shards, value must be a power of two
Shards int
// Time after which entry can be evicted
LifeWindow time.Duration
// Interval between removing expired entries (clean up).
// If set to <= 0 then no action is performed. Setting to < 1 second is counterproductive — bigcache has a one second resolution.
CleanWindow time.Duration
// Max number of entries in life window. Used only to calculate initial size for cache shards.
// When proper value is set then additional memory allocation does not occur.
MaxEntriesInWindow int
// Max size of entry in bytes. Used only to calculate initial size for cache shards.
MaxEntrySize int
// Verbose mode prints information about new memory allocation
Verbose bool
// Hasher used to map between string keys and unsigned 64bit integers, by default fnv64 hashing is used.
Hasher Hasher
// HardMaxCacheSize is a limit for cache size in MB. Cache will not allocate more memory than this limit.
// It can protect application from consuming all available memory on machine, therefore from running OOM Killer.
// Default value is 0 which means unlimited size. When the limit is higher than 0 and reached then
// the oldest entries are overridden for the new ones.
HardMaxCacheSize int
// OnRemove is a callback fired when the oldest entry is removed because of its expiration time or no space left
// for the new entry, or because delete was called.
// Default value is nil which means no callback and it prevents from unwrapping the oldest entry.
OnRemove func(key string, entry []byte)
// OnRemoveWithReason is a callback fired when the oldest entry is removed because of its expiration time or no space left
// for the new entry, or because delete was called. A constant representing the reason will be passed through.
// Default value is nil which means no callback and it prevents from unwrapping the oldest entry.
// Ignored if OnRemove is specified.
OnRemoveWithReason func(key string, entry []byte, reason RemoveReason)
onRemoveFilter int
// Logger is a logging interface and used in combination with `Verbose`
// Defaults to `DefaultLogger()`
Logger Logger
}
// DefaultConfig initializes config with default values.
// When load for BigCache can be predicted in advance then it is better to use custom config.
func DefaultConfig(eviction time.Duration) Config {
return Config{
Shards: 1024,
LifeWindow: eviction,
CleanWindow: 0,
MaxEntriesInWindow: 1000 * 10 * 60,
MaxEntrySize: 500,
Verbose: true,
Hasher: newDefaultHasher(),
HardMaxCacheSize: 0,
Logger: DefaultLogger(),
}
}
// initialShardSize computes initial shard size
func (c Config) initialShardSize() int {
return max(c.MaxEntriesInWindow/c.Shards, minimumEntriesInShard)
}
// maximumShardSize computes maximum shard size
func (c Config) maximumShardSize() int {
maxShardSize := 0
if c.HardMaxCacheSize > 0 {
maxShardSize = convertMBToBytes(c.HardMaxCacheSize) / c.Shards
}
return maxShardSize
}
// OnRemoveFilterSet sets which remove reasons will trigger a call to OnRemoveWithReason.
// Filtering out reasons prevents bigcache from unwrapping them, which saves cpu.
func (c Config) OnRemoveFilterSet(reasons ...RemoveReason) Config {
c.onRemoveFilter = 0
for i := range reasons {
c.onRemoveFilter |= 1 << uint(reasons[i])
}
return c
}

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package bigcache
import (
"encoding/binary"
)
const (
timestampSizeInBytes = 8 // Number of bytes used for timestamp
hashSizeInBytes = 8 // Number of bytes used for hash
keySizeInBytes = 2 // Number of bytes used for size of entry key
headersSizeInBytes = timestampSizeInBytes + hashSizeInBytes + keySizeInBytes // Number of bytes used for all headers
)
func wrapEntry(timestamp uint64, hash uint64, key string, entry []byte, buffer *[]byte) []byte {
keyLength := len(key)
blobLength := len(entry) + headersSizeInBytes + keyLength
if blobLength > len(*buffer) {
*buffer = make([]byte, blobLength)
}
blob := *buffer
binary.LittleEndian.PutUint64(blob, timestamp)
binary.LittleEndian.PutUint64(blob[timestampSizeInBytes:], hash)
binary.LittleEndian.PutUint16(blob[timestampSizeInBytes+hashSizeInBytes:], uint16(keyLength))
copy(blob[headersSizeInBytes:], key)
copy(blob[headersSizeInBytes+keyLength:], entry)
return blob[:blobLength]
}
func readEntry(data []byte) []byte {
length := binary.LittleEndian.Uint16(data[timestampSizeInBytes+hashSizeInBytes:])
// copy on read
dst := make([]byte, len(data)-int(headersSizeInBytes+length))
copy(dst, data[headersSizeInBytes+length:])
return dst
}
func readTimestampFromEntry(data []byte) uint64 {
return binary.LittleEndian.Uint64(data)
}
func readKeyFromEntry(data []byte) string {
length := binary.LittleEndian.Uint16(data[timestampSizeInBytes+hashSizeInBytes:])
// copy on read
dst := make([]byte, length)
copy(dst, data[headersSizeInBytes:headersSizeInBytes+length])
return bytesToString(dst)
}
func readHashFromEntry(data []byte) uint64 {
return binary.LittleEndian.Uint64(data[timestampSizeInBytes:])
}
func resetKeyFromEntry(data []byte) {
binary.LittleEndian.PutUint64(data[timestampSizeInBytes:], 0)
}

17
vendor/github.com/allegro/bigcache/entry_not_found_error.go generated vendored Normal file
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package bigcache
import "fmt"
// EntryNotFoundError is an error type struct which is returned when entry was not found for provided key
type EntryNotFoundError struct {
key string
}
func notFound(key string) error {
return &EntryNotFoundError{key}
}
// Error returned when entry does not exist.
func (e EntryNotFoundError) Error() string {
return fmt.Sprintf("Entry %q not found", e.key)
}

28
vendor/github.com/allegro/bigcache/fnv.go generated vendored Normal file
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package bigcache
// newDefaultHasher returns a new 64-bit FNV-1a Hasher which makes no memory allocations.
// Its Sum64 method will lay the value out in big-endian byte order.
// See https://en.wikipedia.org/wiki/Fowler–Noll–Vo_hash_function
func newDefaultHasher() Hasher {
return fnv64a{}
}
type fnv64a struct{}
const (
// offset64 FNVa offset basis. See https://en.wikipedia.org/wiki/Fowler–Noll–Vo_hash_function#FNV-1a_hash
offset64 = 14695981039346656037
// prime64 FNVa prime value. See https://en.wikipedia.org/wiki/Fowler–Noll–Vo_hash_function#FNV-1a_hash
prime64 = 1099511628211
)
// Sum64 gets the string and returns its uint64 hash value.
func (f fnv64a) Sum64(key string) uint64 {
var hash uint64 = offset64
for i := 0; i < len(key); i++ {
hash ^= uint64(key[i])
hash *= prime64
}
return hash
}

8
vendor/github.com/allegro/bigcache/hash.go generated vendored Normal file
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package bigcache
// Hasher is responsible for generating unsigned, 64 bit hash of provided string. Hasher should minimize collisions
// (generating same hash for different strings) and while performance is also important fast functions are preferable (i.e.
// you can use FarmHash family).
type Hasher interface {
Sum64(string) uint64
}

122
vendor/github.com/allegro/bigcache/iterator.go generated vendored Normal file
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package bigcache
import "sync"
type iteratorError string
func (e iteratorError) Error() string {
return string(e)
}
// ErrInvalidIteratorState is reported when iterator is in invalid state
const ErrInvalidIteratorState = iteratorError("Iterator is in invalid state. Use SetNext() to move to next position")
// ErrCannotRetrieveEntry is reported when entry cannot be retrieved from underlying
const ErrCannotRetrieveEntry = iteratorError("Could not retrieve entry from cache")
var emptyEntryInfo = EntryInfo{}
// EntryInfo holds informations about entry in the cache
type EntryInfo struct {
timestamp uint64
hash uint64
key string
value []byte
}
// Key returns entry's underlying key
func (e EntryInfo) Key() string {
return e.key
}
// Hash returns entry's hash value
func (e EntryInfo) Hash() uint64 {
return e.hash
}
// Timestamp returns entry's timestamp (time of insertion)
func (e EntryInfo) Timestamp() uint64 {
return e.timestamp
}
// Value returns entry's underlying value
func (e EntryInfo) Value() []byte {
return e.value
}
// EntryInfoIterator allows to iterate over entries in the cache
type EntryInfoIterator struct {
mutex sync.Mutex
cache *BigCache
currentShard int
currentIndex int
elements []uint32
elementsCount int
valid bool
}
// SetNext moves to next element and returns true if it exists.
func (it *EntryInfoIterator) SetNext() bool {
it.mutex.Lock()
it.valid = false
it.currentIndex++
if it.elementsCount > it.currentIndex {
it.valid = true
it.mutex.Unlock()
return true
}
for i := it.currentShard + 1; i < it.cache.config.Shards; i++ {
it.elements, it.elementsCount = it.cache.shards[i].copyKeys()
// Non empty shard - stick with it
if it.elementsCount > 0 {
it.currentIndex = 0
it.currentShard = i
it.valid = true
it.mutex.Unlock()
return true
}
}
it.mutex.Unlock()
return false
}
func newIterator(cache *BigCache) *EntryInfoIterator {
elements, count := cache.shards[0].copyKeys()
return &EntryInfoIterator{
cache: cache,
currentShard: 0,
currentIndex: -1,
elements: elements,
elementsCount: count,
}
}
// Value returns current value from the iterator
func (it *EntryInfoIterator) Value() (EntryInfo, error) {
it.mutex.Lock()
if !it.valid {
it.mutex.Unlock()
return emptyEntryInfo, ErrInvalidIteratorState
}
entry, err := it.cache.shards[it.currentShard].getEntry(int(it.elements[it.currentIndex]))
if err != nil {
it.mutex.Unlock()
return emptyEntryInfo, ErrCannotRetrieveEntry
}
it.mutex.Unlock()
return EntryInfo{
timestamp: readTimestampFromEntry(entry),
hash: readHashFromEntry(entry),
key: readKeyFromEntry(entry),
value: readEntry(entry),
}, nil
}

30
vendor/github.com/allegro/bigcache/logger.go generated vendored Normal file
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package bigcache
import (
"log"
"os"
)
// Logger is invoked when `Config.Verbose=true`
type Logger interface {
Printf(format string, v ...interface{})
}
// this is a safeguard, breaking on compile time in case
// `log.Logger` does not adhere to our `Logger` interface.
// see https://golang.org/doc/faq#guarantee_satisfies_interface
var _ Logger = &log.Logger{}
// DefaultLogger returns a `Logger` implementation
// backed by stdlib's log
func DefaultLogger() *log.Logger {
return log.New(os.Stdout, "", log.LstdFlags)
}
func newLogger(custom Logger) Logger {
if custom != nil {
return custom
}
return DefaultLogger()
}

210
vendor/github.com/allegro/bigcache/queue/bytes_queue.go generated vendored Normal file
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package queue
import (
"encoding/binary"
"log"
"time"
)
const (
// Number of bytes used to keep information about entry size
headerEntrySize = 4
// Bytes before left margin are not used. Zero index means element does not exist in queue, useful while reading slice from index
leftMarginIndex = 1
// Minimum empty blob size in bytes. Empty blob fills space between tail and head in additional memory allocation.
// It keeps entries indexes unchanged
minimumEmptyBlobSize = 32 + headerEntrySize
)
// BytesQueue is a non-thread safe queue type of fifo based on bytes array.
// For every push operation index of entry is returned. It can be used to read the entry later
type BytesQueue struct {
array []byte
capacity int
maxCapacity int
head int
tail int
count int
rightMargin int
headerBuffer []byte
verbose bool
initialCapacity int
}
type queueError struct {
message string
}
// NewBytesQueue initialize new bytes queue.
// Initial capacity is used in bytes array allocation
// When verbose flag is set then information about memory allocation are printed
func NewBytesQueue(initialCapacity int, maxCapacity int, verbose bool) *BytesQueue {
return &BytesQueue{
array: make([]byte, initialCapacity),
capacity: initialCapacity,
maxCapacity: maxCapacity,
headerBuffer: make([]byte, headerEntrySize),
tail: leftMarginIndex,
head: leftMarginIndex,
rightMargin: leftMarginIndex,
verbose: verbose,
initialCapacity: initialCapacity,
}
}
// Reset removes all entries from queue
func (q *BytesQueue) Reset() {
// Just reset indexes
q.tail = leftMarginIndex
q.head = leftMarginIndex
q.rightMargin = leftMarginIndex
q.count = 0
}
// Push copies entry at the end of queue and moves tail pointer. Allocates more space if needed.
// Returns index for pushed data or error if maximum size queue limit is reached.
func (q *BytesQueue) Push(data []byte) (int, error) {
dataLen := len(data)
if q.availableSpaceAfterTail() < dataLen+headerEntrySize {
if q.availableSpaceBeforeHead() >= dataLen+headerEntrySize {
q.tail = leftMarginIndex
} else if q.capacity+headerEntrySize+dataLen >= q.maxCapacity && q.maxCapacity > 0 {
return -1, &queueError{"Full queue. Maximum size limit reached."}
} else {
q.allocateAdditionalMemory(dataLen + headerEntrySize)
}
}
index := q.tail
q.push(data, dataLen)
return index, nil
}
func (q *BytesQueue) allocateAdditionalMemory(minimum int) {
start := time.Now()
if q.capacity < minimum {
q.capacity += minimum
}
q.capacity = q.capacity * 2
if q.capacity > q.maxCapacity && q.maxCapacity > 0 {
q.capacity = q.maxCapacity
}
oldArray := q.array
q.array = make([]byte, q.capacity)
if leftMarginIndex != q.rightMargin {
copy(q.array, oldArray[:q.rightMargin])
if q.tail < q.head {
emptyBlobLen := q.head - q.tail - headerEntrySize
q.push(make([]byte, emptyBlobLen), emptyBlobLen)
q.head = leftMarginIndex
q.tail = q.rightMargin
}
}
if q.verbose {
log.Printf("Allocated new queue in %s; Capacity: %d \n", time.Since(start), q.capacity)
}
}
func (q *BytesQueue) push(data []byte, len int) {
binary.LittleEndian.PutUint32(q.headerBuffer, uint32(len))
q.copy(q.headerBuffer, headerEntrySize)
q.copy(data, len)
if q.tail > q.head {
q.rightMargin = q.tail
}
q.count++
}
func (q *BytesQueue) copy(data []byte, len int) {
q.tail += copy(q.array[q.tail:], data[:len])
}
// Pop reads the oldest entry from queue and moves head pointer to the next one
func (q *BytesQueue) Pop() ([]byte, error) {
data, size, err := q.peek(q.head)
if err != nil {
return nil, err
}
q.head += headerEntrySize + size
q.count--
if q.head == q.rightMargin {
q.head = leftMarginIndex
if q.tail == q.rightMargin {
q.tail = leftMarginIndex
}
q.rightMargin = q.tail
}
return data, nil
}
// Peek reads the oldest entry from list without moving head pointer
func (q *BytesQueue) Peek() ([]byte, error) {
data, _, err := q.peek(q.head)
return data, err
}
// Get reads entry from index
func (q *BytesQueue) Get(index int) ([]byte, error) {
data, _, err := q.peek(index)
return data, err
}
// Capacity returns number of allocated bytes for queue
func (q *BytesQueue) Capacity() int {
return q.capacity
}
// Len returns number of entries kept in queue
func (q *BytesQueue) Len() int {
return q.count
}
// Error returns error message
func (e *queueError) Error() string {
return e.message
}
func (q *BytesQueue) peek(index int) ([]byte, int, error) {
if q.count == 0 {
return nil, 0, &queueError{"Empty queue"}
}
if index <= 0 {
return nil, 0, &queueError{"Index must be grater than zero. Invalid index."}
}
if index+headerEntrySize >= len(q.array) {
return nil, 0, &queueError{"Index out of range"}
}
blockSize := int(binary.LittleEndian.Uint32(q.array[index : index+headerEntrySize]))
return q.array[index+headerEntrySize : index+headerEntrySize+blockSize], blockSize, nil
}
func (q *BytesQueue) availableSpaceAfterTail() int {
if q.tail >= q.head {
return q.capacity - q.tail
}
return q.head - q.tail - minimumEmptyBlobSize
}
func (q *BytesQueue) availableSpaceBeforeHead() int {
if q.tail >= q.head {
return q.head - leftMarginIndex - minimumEmptyBlobSize
}
return q.head - q.tail - minimumEmptyBlobSize
}

236
vendor/github.com/allegro/bigcache/shard.go generated vendored Normal file
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package bigcache
import (
"fmt"
"sync"
"sync/atomic"
"github.com/allegro/bigcache/queue"
)
type onRemoveCallback func(wrappedEntry []byte, reason RemoveReason)
type cacheShard struct {
hashmap map[uint64]uint32
entries queue.BytesQueue
lock sync.RWMutex
entryBuffer []byte
onRemove onRemoveCallback
isVerbose bool
logger Logger
clock clock
lifeWindow uint64
stats Stats
}
func (s *cacheShard) get(key string, hashedKey uint64) ([]byte, error) {
s.lock.RLock()
itemIndex := s.hashmap[hashedKey]
if itemIndex == 0 {
s.lock.RUnlock()
s.miss()
return nil, notFound(key)
}
wrappedEntry, err := s.entries.Get(int(itemIndex))
if err != nil {
s.lock.RUnlock()
s.miss()
return nil, err
}
if entryKey := readKeyFromEntry(wrappedEntry); key != entryKey {
if s.isVerbose {
s.logger.Printf("Collision detected. Both %q and %q have the same hash %x", key, entryKey, hashedKey)
}
s.lock.RUnlock()
s.collision()
return nil, notFound(key)
}
s.lock.RUnlock()
s.hit()
return readEntry(wrappedEntry), nil
}
func (s *cacheShard) set(key string, hashedKey uint64, entry []byte) error {
currentTimestamp := uint64(s.clock.epoch())
s.lock.Lock()
if previousIndex := s.hashmap[hashedKey]; previousIndex != 0 {
if previousEntry, err := s.entries.Get(int(previousIndex)); err == nil {
resetKeyFromEntry(previousEntry)
}
}
if oldestEntry, err := s.entries.Peek(); err == nil {
s.onEvict(oldestEntry, currentTimestamp, s.removeOldestEntry)
}
w := wrapEntry(currentTimestamp, hashedKey, key, entry, &s.entryBuffer)
for {
if index, err := s.entries.Push(w); err == nil {
s.hashmap[hashedKey] = uint32(index)
s.lock.Unlock()
return nil
}
if s.removeOldestEntry(NoSpace) != nil {
s.lock.Unlock()
return fmt.Errorf("entry is bigger than max shard size")
}
}
}
func (s *cacheShard) del(key string, hashedKey uint64) error {
s.lock.RLock()
itemIndex := s.hashmap[hashedKey]
if itemIndex == 0 {
s.lock.RUnlock()
s.delmiss()
return notFound(key)
}
wrappedEntry, err := s.entries.Get(int(itemIndex))
if err != nil {
s.lock.RUnlock()
s.delmiss()
return err
}
s.lock.RUnlock()
s.lock.Lock()
{
delete(s.hashmap, hashedKey)
s.onRemove(wrappedEntry, Deleted)
resetKeyFromEntry(wrappedEntry)
}
s.lock.Unlock()
s.delhit()
return nil
}
func (s *cacheShard) onEvict(oldestEntry []byte, currentTimestamp uint64, evict func(reason RemoveReason) error) bool {
oldestTimestamp := readTimestampFromEntry(oldestEntry)
if currentTimestamp-oldestTimestamp > s.lifeWindow {
evict(Expired)
return true
}
return false
}
func (s *cacheShard) cleanUp(currentTimestamp uint64) {
s.lock.Lock()
for {
if oldestEntry, err := s.entries.Peek(); err != nil {
break
} else if evicted := s.onEvict(oldestEntry, currentTimestamp, s.removeOldestEntry); !evicted {
break
}
}
s.lock.Unlock()
}
func (s *cacheShard) getOldestEntry() ([]byte, error) {
return s.entries.Peek()
}
func (s *cacheShard) getEntry(index int) ([]byte, error) {
return s.entries.Get(index)
}
func (s *cacheShard) copyKeys() (keys []uint32, next int) {
keys = make([]uint32, len(s.hashmap))
s.lock.RLock()
for _, index := range s.hashmap {
keys[next] = index
next++
}
s.lock.RUnlock()
return keys, next
}
func (s *cacheShard) removeOldestEntry(reason RemoveReason) error {
oldest, err := s.entries.Pop()
if err == nil {
hash := readHashFromEntry(oldest)
delete(s.hashmap, hash)
s.onRemove(oldest, reason)
return nil
}
return err
}
func (s *cacheShard) reset(config Config) {
s.lock.Lock()
s.hashmap = make(map[uint64]uint32, config.initialShardSize())
s.entryBuffer = make([]byte, config.MaxEntrySize+headersSizeInBytes)
s.entries.Reset()
s.lock.Unlock()
}
func (s *cacheShard) len() int {
s.lock.RLock()
res := len(s.hashmap)
s.lock.RUnlock()
return res
}
func (s *cacheShard) capacity() int {
s.lock.RLock()
res := s.entries.Capacity()
s.lock.RUnlock()
return res
}
func (s *cacheShard) getStats() Stats {
var stats = Stats{
Hits: atomic.LoadInt64(&s.stats.Hits),
Misses: atomic.LoadInt64(&s.stats.Misses),
DelHits: atomic.LoadInt64(&s.stats.DelHits),
DelMisses: atomic.LoadInt64(&s.stats.DelMisses),
Collisions: atomic.LoadInt64(&s.stats.Collisions),
}
return stats
}
func (s *cacheShard) hit() {
atomic.AddInt64(&s.stats.Hits, 1)
}
func (s *cacheShard) miss() {
atomic.AddInt64(&s.stats.Misses, 1)
}
func (s *cacheShard) delhit() {
atomic.AddInt64(&s.stats.DelHits, 1)
}
func (s *cacheShard) delmiss() {
atomic.AddInt64(&s.stats.DelMisses, 1)
}
func (s *cacheShard) collision() {
atomic.AddInt64(&s.stats.Collisions, 1)
}
func initNewShard(config Config, callback onRemoveCallback, clock clock) *cacheShard {
return &cacheShard{
hashmap: make(map[uint64]uint32, config.initialShardSize()),
entries: *queue.NewBytesQueue(config.initialShardSize()*config.MaxEntrySize, config.maximumShardSize(), config.Verbose),
entryBuffer: make([]byte, config.MaxEntrySize+headersSizeInBytes),
onRemove: callback,
isVerbose: config.Verbose,
logger: newLogger(config.Logger),
clock: clock,
lifeWindow: uint64(config.LifeWindow.Seconds()),
}
}

15
vendor/github.com/allegro/bigcache/stats.go generated vendored Normal file
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package bigcache
// Stats stores cache statistics
type Stats struct {
// Hits is a number of successfully found keys
Hits int64 `json:"hits"`
// Misses is a number of not found keys
Misses int64 `json:"misses"`
// DelHits is a number of successfully deleted keys
DelHits int64 `json:"delete_hits"`
// DelMisses is a number of not deleted keys
DelMisses int64 `json:"delete_misses"`
// Collisions is a number of happened key-collisions
Collisions int64 `json:"collisions"`
}

16
vendor/github.com/allegro/bigcache/utils.go generated vendored Normal file
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package bigcache
func max(a, b int) int {
if a > b {
return a
}
return b
}
func convertMBToBytes(value int) int {
return value * 1024 * 1024
}
func isPowerOfTwo(number int) bool {
return (number & (number - 1)) == 0
}