101 lines
3.1 KiB
Go
101 lines
3.1 KiB
Go
// Package store is an interface for distributed data storage.
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package store
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import (
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"context"
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"errors"
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"time"
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)
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var (
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ErrWatcherStopped = errors.New("watcher stopped")
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// ErrNotConnected is returned when a store is not connected
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ErrNotConnected = errors.New("not conected")
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// ErrNotFound is returned when a key doesn't exist
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ErrNotFound = errors.New("not found")
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// ErrInvalidKey is returned when a key has empty or have invalid format
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ErrInvalidKey = errors.New("invalid key")
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// DefaultStore is the global default store
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DefaultStore Store = NewStore()
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// DefaultSeparator is the gloabal default key parts separator
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DefaultSeparator = "/"
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)
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// Store is a data storage interface
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type Store interface {
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// Name returns store name
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Name() string
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// Init initialises the store
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Init(opts ...Option) error
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// Connect is used when store needs to be connected
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Connect(ctx context.Context) error
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// Options allows you to view the current options.
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Options() Options
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// Exists check that key exists in store
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Exists(ctx context.Context, key string, opts ...ExistsOption) error
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// Read reads a single key name to provided value with optional ReadOptions
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Read(ctx context.Context, key string, val interface{}, opts ...ReadOption) error
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// Write writes a value to key name to the store with optional WriteOption
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Write(ctx context.Context, key string, val interface{}, opts ...WriteOption) error
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// Delete removes the record with the corresponding key from the store.
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Delete(ctx context.Context, key string, opts ...DeleteOption) error
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// List returns any keys that match, or an empty list with no error if none matched.
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List(ctx context.Context, opts ...ListOption) ([]string, error)
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// Disconnect the store
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Disconnect(ctx context.Context) error
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// String returns the name of the implementation.
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String() string
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Watch(ctx context.Context, opts ...WatchOption) (Watcher, error)
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}
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type (
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FuncExists func(ctx context.Context, key string, opts ...ExistsOption) error
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HookExists func(next FuncExists) FuncExists
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FuncRead func(ctx context.Context, key string, val interface{}, opts ...ReadOption) error
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HookRead func(next FuncRead) FuncRead
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FuncWrite func(ctx context.Context, key string, val interface{}, opts ...WriteOption) error
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HookWrite func(next FuncWrite) FuncWrite
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FuncDelete func(ctx context.Context, key string, opts ...DeleteOption) error
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HookDelete func(next FuncDelete) FuncDelete
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FuncList func(ctx context.Context, opts ...ListOption) ([]string, error)
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HookList func(next FuncList) FuncList
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)
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type EventType int
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const (
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EventTypeUnknown = iota
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EventTypeConnect
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EventTypeDisconnect
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EventTypeOpError
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)
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type Event interface {
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Timestamp() time.Time
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Error() error
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Type() EventType
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}
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type Watcher interface {
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// Next is a blocking call
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Next() (Event, error)
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// Stop stops the watcher
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Stop()
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}
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type WatchOption func(*WatchOptions) error
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type WatchOptions struct{}
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func NewWatchOptions(opts ...WatchOption) (WatchOptions, error) {
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options := WatchOptions{}
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var err error
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for _, o := range opts {
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if err = o(&options); err != nil {
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break
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}
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}
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return options, err
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}
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