store

package
v3.13.1 Latest Latest
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 Go to latest Published: Sep 21, 2022 License: Apache-2.0 Imports: 5 Imported by: 0

Documentation

Overview

Package store is an interface for distributed data storage. The design document is located at https://github.com/micro/development/blob/master/design/framework/store.md

Index

Constants

View Source 
const (
	OrderAsc  = Order("asc")
	OrderDesc = Order("desc")
)

Variables

View Source 
var (
	// DefaultStore implementation
	DefaultStore Store
	// DefaultBlobStore implementation
	DefaultBlobStore BlobStore
	// ErrNotFound is returned when a key doesn't exist
	ErrNotFound = errors.New("not found")
)
View Source 
var (
	// ErrMissingKey is returned when no key is passed to blob store Read / Write
	ErrMissingKey = errors.New("missing key")
)

Functions

func Delete 

func Delete(key string) error

Delete removes the record with the corresponding key from the store.

func List 

func List(opts ...ListOption) ([]string, error)

List returns any keys that match, or an empty list with no error if none matched.

func Write 

func Write(r *Record) error

Write a record to the store

Types

type BlobListOption 

type BlobListOption func(o *BlobListOptions)

func BlobListNamespace 

func BlobListNamespace(namespace string) BlobListOption

func BlobListPrefix 

func BlobListPrefix(prefix string) BlobListOption

type BlobListOptions 

type BlobListOptions struct {
	Namespace string
	Prefix    string
}

type BlobOption 

type BlobOption func(o *BlobOptions)

BlobOption sets one or more BlobOptions

func BlobContentType 

func BlobContentType(contentType string) BlobOption

BlobNamespace sets the Public option

func BlobNamespace 

func BlobNamespace(ns string) BlobOption

BlobNamespace sets the Namespace option

func BlobPublic 

func BlobPublic(p bool) BlobOption

BlobNamespace sets the Public option

type BlobOptions 

type BlobOptions struct {
	// Namespace to  from
	Namespace   string
	Public      bool
	ContentType string
}

BlobOptions contains options to use when interacting with the store

type BlobStore 

type BlobStore interface {
	Read(key string, opts ...BlobOption) (io.Reader, error)
	Write(key string, blob io.Reader, opts ...BlobOption) error
	Delete(key string, opts ...BlobOption) error
	// List returns any keys that match, or an empty list with no error if none matched.
	List(opts ...BlobListOption) ([]string, error)
}

BlobStore is an interface for reading / writing blobs

type DeleteOption 

type DeleteOption func(d *DeleteOptions)

DeleteOption sets values in DeleteOptions

func DeleteFrom 

func DeleteFrom(database, table string) DeleteOption

DeleteFrom the database and table

type DeleteOptions 

type DeleteOptions struct {
	Database, Table string
}

DeleteOptions configures an individual Delete operation

type ListOption 

type ListOption func(l *ListOptions)

ListOption sets values in ListOptions

func ListFrom 

func ListFrom(database, table string) ListOption

ListFrom the database and table

func ListLimit 

func ListLimit(l uint) ListOption

ListLimit limits the number of returned keys to l

func ListOffset 

func ListOffset(o uint) ListOption

ListOffset starts returning responses from o. Use in conjunction with Limit for pagination.

func ListOrder 

func ListOrder(o Order) ListOption

ListOrder specifies the order to return the data

func ListPrefix 

func ListPrefix(p string) ListOption

ListPrefix returns all keys that are prefixed with key

func ListSuffix 

func ListSuffix(s string) ListOption

ListSuffix returns all keys that end with key

type ListOptions 

type ListOptions struct {
	// List from the following
	Database, Table string
	// Prefix returns all keys that are prefixed with key
	Prefix string
	// Suffix returns all keys that end with key
	Suffix string
	// Limit limits the number of returned keys
	Limit uint
	// Offset when combined with Limit supports pagination
	Offset uint
	// Order to list the data set
	Order Order
}

ListOptions configures an individual List operation

type Option 

type Option func(o *Options)

Option sets values in Options

func Database 

func Database(db string) Option

Database allows multiple isolated stores to be kept in one backend, if supported.

func Nodes 

func Nodes(a ...string) Option

Nodes contains the addresses or other connection information of the backing storage. For example, an etcd implementation would contain the nodes of the cluster. A SQL implementation could contain one or more connection strings.

func Table 

func Table(t string) Option

Table is analagous to a table in database backends or a key prefix in KV backends

func WithContext 

func WithContext(c context.Context) Option

WithContext sets the stores context, for any extra configuration

type Options 

type Options struct {
	// Nodes contains the addresses or other connection information of the backing storage.
	// For example, an etcd implementation would contain the nodes of the cluster.
	// A SQL implementation could contain one or more connection strings.
	Nodes []string
	// Database allows multiple isolated stores to be kept in one backend, if supported.
	Database string
	// Table is analagous to a table in database backends or a key prefix in KV backends
	Table string
	// Context should contain all implementation specific options, using context.WithValue.
	Context context.Context
}

Options contains configuration for the Store

type Order 

type Order string

Order

type ReadOption 

type ReadOption func(r *ReadOptions)

ReadOption sets values in ReadOptions

func ReadFrom 

func ReadFrom(database, table string) ReadOption

ReadFrom the database and table

func ReadLimit 

func ReadLimit(l uint) ReadOption

ReadLimit limits the number of responses to l

func ReadOffset 

func ReadOffset(o uint) ReadOption

ReadOffset starts returning responses from o. Use in conjunction with Limit for pagination

func ReadOrder 

func ReadOrder(o Order) ReadOption

ReadOrder specifies the order to return the data

func ReadPrefix 

func ReadPrefix() ReadOption

ReadPrefix returns all records that are prefixed with key

func ReadSuffix 

func ReadSuffix() ReadOption

ReadSuffix returns all records that have the suffix key

type ReadOptions 

type ReadOptions struct {
	Database, Table string
	// Prefix returns all records that are prefixed with key
	Prefix bool
	// Suffix returns all records that have the suffix key
	Suffix bool
	// Limit limits the number of returned records
	Limit uint
	// Offset when combined with Limit supports pagination
	Offset uint
	// Order of the data returned e.g asc or desc
	Order Order
}

ReadOptions configures an individual Read operation

type Record 

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"`
}

Record is an item stored or retrieved from a Store

func NewRecord 

func NewRecord(key string, val interface{}) *Record

NewRecord returns a record from key, val

func Read 

func Read(key string, opts ...ReadOption) ([]*Record, error)

Read records

func (*Record) Decode 

func (r *Record) Decode(v interface{}) error

Decode is a convenience helper for decoding records

func (*Record) Encode 

func (r *Record) Encode(v interface{}) error

Encode will marshal any type into the byte Value field

type Store 

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
}

Store is a data storage interface

type StoreOption 

type StoreOption = Option

type StoreOptions 

type StoreOptions = Options

type WriteOption 

type WriteOption func(w *WriteOptions)

WriteOption sets values in WriteOptions

func WriteTo 

func WriteTo(database, table string) WriteOption

WriteTo the database and table

type WriteOptions 

type WriteOptions struct {
	Database, Table string
}

WriteOptions configures an individual Write operation If Expiry and TTL are set TTL takes precedence

Source Files

View all Source files

Directories

Path Synopsis
Package local is a file system backed store
 Package local is a file system backed store
Package memory is a in-memory store store
 Package memory is a in-memory store store

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