// Package etcd is an etcd v3 implementation of kv package etcd import ( "context" "log" client "github.com/coreos/etcd/clientv3" "github.com/coreos/etcd/mvcc/mvccpb" "github.com/micro/go-micro/store" ) type ekv struct { options store.Options kv client.KV } func (e *ekv) Read(keys ...string) ([]*store.Record, error) { //nolint:prealloc var values []*mvccpb.KeyValue for _, key := range keys { keyval, err := e.kv.Get(context.Background(), key) if err != nil { return nil, err } if keyval == nil || len(keyval.Kvs) == 0 { return nil, store.ErrNotFound } values = append(values, keyval.Kvs...) } records := make([]*store.Record, 0, len(values)) for _, kv := range values { records = append(records, &store.Record{ Key: string(kv.Key), Value: kv.Value, // TODO: implement expiry }) } return records, nil } func (e *ekv) Delete(keys ...string) error { var gerr error for _, key := range keys { _, err := e.kv.Delete(context.Background(), key) if err != nil { gerr = err } } return gerr } func (e *ekv) Write(records ...*store.Record) error { var gerr error for _, record := range records { // TODO create lease to expire keys _, err := e.kv.Put(context.Background(), record.Key, string(record.Value)) if err != nil { gerr = err } } return gerr } 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), } }