🔑 A high performance Key/Value store written in Go with a predictable read/write performance and high throughput. Uses a Bitcask on-disk layout (LSM+WAL) similar to Riak.
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package bitcask
import (
"os"
"git.mills.io/prologic/bitcask/internal/config"
)
const (
// DefaultDirFileModeBeforeUmask is the default os.FileMode used when creating directories
DefaultDirFileModeBeforeUmask = os.FileMode(0700)
// DefaultFileFileModeBeforeUmask is the default os.FileMode used when creating files
DefaultFileFileModeBeforeUmask = os.FileMode(0600)
// DefaultMaxDatafileSize is the default maximum datafile size in bytes
DefaultMaxDatafileSize = 1 << 20 // 1MB
// DefaultMaxKeySize is the default maximum key size in bytes
DefaultMaxKeySize = uint32(64) // 64 bytes
// DefaultMaxValueSize is the default value size in bytes
DefaultMaxValueSize = uint64(1 << 16) // 65KB
// DefaultSync is the default file synchronization action
DefaultSync = false
// DefaultAutoRecovery is the default auto-recovery action.
CurrentDBVersion = uint32(1)
)
// Option is a function that takes a config struct and modifies it
type Option func(*config.Config) error
func withConfig(src *config.Config) Option {
return func(cfg *config.Config) error {
cfg.MaxDatafileSize = src.MaxDatafileSize
cfg.MaxKeySize = src.MaxKeySize
cfg.MaxValueSize = src.MaxValueSize
cfg.Sync = src.Sync
cfg.AutoRecovery = src.AutoRecovery
cfg.DirFileModeBeforeUmask = src.DirFileModeBeforeUmask
cfg.FileFileModeBeforeUmask = src.FileFileModeBeforeUmask
return nil
}
}
// WithAutoRecovery sets auto recovery of data and index file recreation.
// IMPORTANT: This flag MUST BE used only if a proper backup was made of all
// the existing datafiles.
func WithAutoRecovery(enabled bool) Option {
return func(cfg *config.Config) error {
cfg.AutoRecovery = enabled
return nil
}
}
// WithDirFileModeBeforeUmask sets the FileMode used for each new file created.
func WithDirFileModeBeforeUmask(mode os.FileMode) Option {
return func(cfg *config.Config) error {
cfg.DirFileModeBeforeUmask = mode
return nil
}
}
// WithFileFileModeBeforeUmask sets the FileMode used for each new file created.
func WithFileFileModeBeforeUmask(mode os.FileMode) Option {
return func(cfg *config.Config) error {
cfg.FileFileModeBeforeUmask = mode
return nil
}
}
// WithMaxDatafileSize sets the maximum datafile size option
func WithMaxDatafileSize(size int) Option {
return func(cfg *config.Config) error {
cfg.MaxDatafileSize = size
return nil
}
}
// WithMaxKeySize sets the maximum key size option
func WithMaxKeySize(size uint32) Option {
return func(cfg *config.Config) error {
cfg.MaxKeySize = size
return nil
}
}
// WithMaxValueSize sets the maximum value size option
func WithMaxValueSize(size uint64) Option {
return func(cfg *config.Config) error {
cfg.MaxValueSize = size
return nil
}
}
// WithSync causes Sync() to be called on every key/value written increasing
// durability and safety at the expense of performance
func WithSync(sync bool) Option {
return func(cfg *config.Config) error {
cfg.Sync = sync
return nil
}
}
func newDefaultConfig() *config.Config {
return &config.Config{
MaxDatafileSize: DefaultMaxDatafileSize,
MaxKeySize: DefaultMaxKeySize,
MaxValueSize: DefaultMaxValueSize,
Sync: DefaultSync,
DirFileModeBeforeUmask: DefaultDirFileModeBeforeUmask,
FileFileModeBeforeUmask: DefaultFileFileModeBeforeUmask,
DBVersion: CurrentDBVersion,
}
}