README
¶
Valkeyrie Redis
valkeyrie provides a Go native library to store metadata using Distributed Key/Value stores (or common databases).
Compatibility
A storage backend in valkeyrie implements (fully or partially) the Store interface.
| Calls | Redis |
|---|---|
| Put | 🟢️ |
| Get | 🟢️ |
| Delete | 🟢️ |
| Exists | 🟢️ |
| Watch | 🟢️ |
| WatchTree | 🟢️ |
| NewLock (Lock/Unlock) | 🟢️ |
| List | 🟢️ |
| DeleteTree | 🟢️ |
| AtomicPut | 🟢️ |
| AtomicDelete | 🟢️ |
Supported Versions
Redis versions >= 3.2.6.
Key space notification needs to be enabled to have access to Watch and Lock methods.
Examples
package main
import (
"context"
"log"
"github.com/kvtools/redis"
"github.com/kvtools/valkeyrie"
)
func main() {
ctx := context.Background()
config := &redis.Config{
Bucket: "example",
}
kv, err := valkeyrie.NewStore(ctx, redis.StoreName, []string{"localhost:8500"}, config)
if err != nil {
log.Fatal("Cannot create store")
}
key := "foo"
err = kv.Put(ctx, key, []byte("bar"), nil)
if err != nil {
log.Fatalf("Error trying to put value at key: %v", key)
}
pair, err := kv.Get(ctx, key, nil)
if err != nil {
log.Fatalf("Error trying accessing value at key: %v", key)
}
log.Printf("value: %s", string(pair.Value))
err = kv.Delete(ctx, key)
if err != nil {
log.Fatalf("Error trying to delete key %v", key)
}
}
Documentation
¶
Overview ¶
Package redis contains the Redis store implementation.
Index ¶
- Constants
- Variables
- type Codec
- type Config
- type JSONCodec
- type RawCodec
- type Sentinel
- type Store
- func (r *Store) AtomicDelete(ctx context.Context, key string, previous *store.KVPair) (bool, error)
- func (r *Store) AtomicPut(ctx context.Context, key string, value []byte, previous *store.KVPair, ...) (bool, *store.KVPair, error)
- func (r *Store) Close() error
- func (r *Store) Delete(ctx context.Context, key string) error
- func (r *Store) DeleteTree(ctx context.Context, directory string) error
- func (r *Store) Exists(ctx context.Context, key string, _ *store.ReadOptions) (bool, error)
- func (r *Store) Get(ctx context.Context, key string, _ *store.ReadOptions) (*store.KVPair, error)
- func (r *Store) List(ctx context.Context, directory string, _ *store.ReadOptions) ([]*store.KVPair, error)
- func (r *Store) NewLock(_ context.Context, key string, opts *store.LockOptions) (store.Locker, error)
- func (r *Store) Put(ctx context.Context, key string, value []byte, opts *store.WriteOptions) error
- func (r *Store) Watch(ctx context.Context, key string, _ *store.ReadOptions) (<-chan *store.KVPair, error)
- func (r *Store) WatchTree(ctx context.Context, directory string, _ *store.ReadOptions) (<-chan []*store.KVPair, error)
Constants ¶
const StoreName = "redis"
StoreName the name of the store.
Variables ¶
var ( // ErrMultipleEndpointsUnsupported is thrown when there are // multiple endpoints specified for Redis. ErrMultipleEndpointsUnsupported = errors.New("redis: does not support multiple endpoints") // ErrAbortTryLock is thrown when a user stops trying to seek the lock // by sending a signal to the stop chan, // this is used to verify if the operation succeeded. ErrAbortTryLock = errors.New("redis: lock operation aborted") // ErrMasterSetMustBeProvided is thrown when Redis Sentinel is enabled // and the MasterName option is undefined. ErrMasterSetMustBeProvided = errors.New("master set name must be provided") // ErrInvalidRoutesOptions is thrown when Redis Sentinel is enabled // with RouteByLatency & RouteRandomly options without the ClusterClient. ErrInvalidRoutesOptions = errors.New("RouteByLatency and RouteRandomly options are only allowed with the ClusterClient") )
Functions ¶
This section is empty.
Types ¶
type Codec ¶
type Codec interface {
Encode(kv *store.KVPair) (string, error)
Decode(b []byte, kv *store.KVPair) error
}
Codec KVPair persistence interface.
type JSONCodec ¶
type JSONCodec struct{}
JSONCodec is a simple codec to read and write valkeyrie JSON object.
type RawCodec ¶
type RawCodec struct{}
RawCodec is a simple codec to read and write string.
type Sentinel ¶ added in v1.1.0
type Sentinel struct {
MasterName string
Username string
Password string
// ClusterClient indicates whether to use the NewFailoverClusterClient to build the client.
ClusterClient bool
// Allows routing read-only commands to the closest master or replica node.
// This option only works with NewFailoverClusterClient.
RouteByLatency bool
// Allows routing read-only commands to the random master or replica node.
// This option only works with NewFailoverClusterClient.
RouteRandomly bool
// Route all commands to replica read-only nodes.
ReplicaOnly bool
// Use replicas disconnected with master when cannot get connected replicas
// Now, this option only works in RandomReplicaAddr function.
UseDisconnectedReplicas bool
}
Sentinel holds the Redis Sentinel configuration.
type Store ¶
type Store struct {
// contains filtered or unexported fields
}
Store implements the store.Store interface.
func NewWithCodec ¶
func NewWithCodec(ctx context.Context, endpoints []string, options *Config, codec Codec) (*Store, error)
NewWithCodec creates a new Redis client with codec config.
func (*Store) AtomicDelete ¶
AtomicDelete is an atomic delete operation on a single value the value will be deleted if previous matched the one stored in db.
func (*Store) AtomicPut ¶
func (r *Store) AtomicPut(ctx context.Context, key string, value []byte, previous *store.KVPair, opts *store.WriteOptions) (bool, *store.KVPair, error)
AtomicPut is an atomic CAS operation on a single value. Pass previous = nil to create a new key. We introduced script on this page, so atomicity is guaranteed.
func (*Store) DeleteTree ¶
DeleteTree deletes a range of keys under a given directory. glitch: we list all available keys first and then delete them all it costs two operations on redis, so is not atomicity.
func (*Store) List ¶
func (r *Store) List(ctx context.Context, directory string, _ *store.ReadOptions) ([]*store.KVPair, error)
List the content of a given prefix.
func (*Store) NewLock ¶
func (r *Store) NewLock(_ context.Context, key string, opts *store.LockOptions) (store.Locker, error)
NewLock creates a lock for a given key. The returned Locker is not held and must be acquired with `.Lock`. The Value is optional.
Source Files