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