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go-micro/store/store.go
2020-12-29 15:49:26 +00:00

48 lines
1.7 KiB
Go

// Package store is an interface for distributed data storage.
// The design document is located at https://github.com/micro/development/blob/master/design/store.md
package store
import (
"errors"
"time"
)
var (
// ErrNotFound is returned when a key doesn't exist
ErrNotFound = errors.New("not found")
// DefaultStore is the memory store.
DefaultStore Store = NewStore()
)
// Store is a data storage interface
type Store interface {
// Init initialises the store. It must perform any required setup on the backing storage implementation and check that it is ready for use, returning any errors.
Init(...Option) error
// Options allows you to view the current options.
Options() Options
// Read takes a single key name and optional ReadOptions. It returns matching []*Record or an error.
Read(key string, opts ...ReadOption) ([]*Record, error)
// Write() writes a record to the store, and returns an error if the record was not written.
Write(r *Record, opts ...WriteOption) error
// Delete removes the record with the corresponding key from the store.
Delete(key string, opts ...DeleteOption) error
// List returns any keys that match, or an empty list with no error if none matched.
List(opts ...ListOption) ([]string, error)
// Close the store
Close() error
// String returns the name of the implementation.
String() string
}
// Record is an item stored or retrieved from a Store
type Record struct {
// The key to store the record
Key string `json:"key"`
// The value within the record
Value []byte `json:"value"`
// Any associated metadata for indexing
Metadata map[string]interface{} `json:"metadata"`
// Time to expire a record: TODO: change to timestamp
Expiry time.Duration `json:"expiry,omitempty"`
}