48 lines
1.8 KiB
Go
48 lines
1.8 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/framework/store.md
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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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// ErrNotFound is returned when a key doesn't exist
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ErrNotFound = errors.New("not found")
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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 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.
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Init(ctx context.Context, opts ...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(ctx context.Context, 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(ctx context.Context, 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(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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// Close the store
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Close(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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}
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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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// 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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// Any associated metadata for indexing
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Metadata map[string]interface{} `json:"metadata"`
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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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