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98 lines
2.8 KiB
Go
98 lines
2.8 KiB
Go
// Package store is an interface for distributed data storage.
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// The design document is located at https://github.com/micro/development/blob/master/design/store.md
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package store
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import (
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"errors"
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"time"
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"encoding/json"
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)
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var (
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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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// DefaultStore is the memory store.
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DefaultStore Store = NewStore()
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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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// Init initializes the store. It must perform any required setup on the backing storage implementation and check that it is ready for use, returning any errors.
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Init(...Option) error
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// Options allows you to view the current options.
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Options() Options
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// Read takes a single key name and optional ReadOptions. It returns matching []*Record or an error.
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Read(key string, opts ...ReadOption) ([]*Record, error)
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// Write() writes a record to the store, and returns an error if the record was not written.
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Write(r *Record, opts ...WriteOption) error
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// Delete removes the record with the corresponding key from the store.
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Delete(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(opts ...ListOption) ([]string, error)
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// Close the store
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Close() error
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// String returns the name of the implementation.
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String() string
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}
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// Record is an item stored or retrieved from a Store.
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type Record struct {
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// Any associated metadata for indexing
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Metadata map[string]interface{} `json:"metadata"`
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// The key to store the record
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Key string `json:"key"`
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// The value within the record
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Value []byte `json:"value"`
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// Time to expire a record: TODO: change to timestamp
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Expiry time.Duration `json:"expiry,omitempty"`
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}
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func NewStore(opts ...Option) Store {
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return NewFileStore(opts...)
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}
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func NewRecord(key string, val interface{}) *Record {
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b, _ := json.Marshal(val)
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return &Record{
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Key: key,
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Value: b,
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}
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}
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// Encode will marshal any type into the byte Value field
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func (r *Record) Encode(v interface{}) error {
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b, err := json.Marshal(v)
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if err != nil {
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return err
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}
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r.Value = b
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return nil
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}
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// Decode is a convenience helper for decoding records
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func (r *Record) Decode(v interface{}) error {
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return json.Unmarshal(r.Value, v)
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}
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// Read records
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func Read(key string, opts ...ReadOption) ([]*Record, error) {
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// execute the query
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return DefaultStore.Read(key, opts...)
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}
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// Write a record to the store
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func Write(r *Record) error {
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return DefaultStore.Write(r)
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}
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// Delete removes the record with the corresponding key from the store.
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func Delete(key string) error {
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return DefaultStore.Delete(key)
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}
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// List returns any keys that match, or an empty list with no error if none matched.
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func List(opts ...ListOption) ([]string, error) {
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return DefaultStore.List(opts...)
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}
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