micro/store/etcd/etcd.go

118 lines
2.2 KiB
Go

// Package etcd is an etcd v3 implementation of kv
package etcd
import (
"context"
"log"
client "github.com/coreos/etcd/clientv3"
"github.com/micro/go-micro/store"
)
type ekv struct {
options store.Options
kv client.KV
}
func (e *ekv) Init(opts ...store.Option) error {
for _, o := range opts {
o(&e.options)
}
return nil
}
func (e *ekv) Read(key string, opts ...store.ReadOption) ([]*store.Record, error) {
var options store.ReadOptions
for _, o := range opts {
o(&options)
}
var etcdOpts []client.OpOption
// set options prefix
if options.Prefix {
etcdOpts = append(etcdOpts, client.WithPrefix())
}
keyval, err := e.kv.Get(context.Background(), key, etcdOpts...)
if err != nil {
return nil, err
}
if keyval == nil || len(keyval.Kvs) == 0 {
return nil, store.ErrNotFound
}
records := make([]*store.Record, 0, len(keyval.Kvs))
for _, kv := range keyval.Kvs {
records = append(records, &store.Record{
Key: string(kv.Key),
Value: kv.Value,
// TODO: implement expiry
})
}
return records, nil
}
func (e *ekv) Delete(key string) error {
_, err := e.kv.Delete(context.Background(), key)
return err
}
func (e *ekv) Write(record *store.Record) error {
// TODO create lease to expire keys
_, err := e.kv.Put(context.Background(), record.Key, string(record.Value))
return err
}
func (e *ekv) List() ([]*store.Record, error) {
keyval, err := e.kv.Get(context.Background(), "/", client.WithPrefix())
if err != nil {
return nil, err
}
if keyval == nil || len(keyval.Kvs) == 0 {
return nil, nil
}
vals := make([]*store.Record, 0, len(keyval.Kvs))
for _, keyv := range keyval.Kvs {
vals = append(vals, &store.Record{
Key: string(keyv.Key),
Value: keyv.Value,
})
}
return vals, nil
}
func (e *ekv) String() string {
return "etcd"
}
func NewStore(opts ...store.Option) store.Store {
var options store.Options
for _, o := range opts {
o(&options)
}
// get the endpoints
endpoints := options.Nodes
if len(endpoints) == 0 {
endpoints = []string{"http://127.0.0.1:2379"}
}
// TODO: parse addresses
c, err := client.New(client.Config{
Endpoints: endpoints,
})
if err != nil {
log.Fatal(err)
}
return &ekv{
options: options,
kv: client.NewKV(c),
}
}