Documentation
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Overview ¶
Package store is an interface for distributed data storage. The design document is located at https://github.com/jn117/micro/development/blob/master/design/store.md
Index ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
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 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 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
}
ListOptions configures an individual List operation
type Option ¶
type Option func(o *Options)
Option sets values in Options
func Nodes ¶
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 WithClient ¶
WithClient sets the stores client to use for RPC
func WithContext ¶
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
// Client to use for RPC
Client client.Client
}
Options contains configuration for the Store
type ReadOption ¶
type ReadOption func(r *ReadOptions)
ReadOption sets values in ReadOptions
func ReadOffset ¶
func ReadOffset(o uint) ReadOption
ReadOffset starts returning responses from o. Use in conjunction with Limit for pagination
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
}
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
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 WriteOption ¶
type WriteOption func(w *WriteOptions)
WriteOption sets values in WriteOptions
func WriteExpiry ¶
func WriteExpiry(t time.Time) WriteOption
WriteExpiry is the time the record expires
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