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etcd.go
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etcd.go
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// 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/arun-spire/go-micro/config/options"
"github.com/arun-spire/go-micro/store"
)
type ekv struct {
options.Options
kv client.KV
}
func (e *ekv) Read(keys ...string) ([]*store.Record, error) {
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
}
var vals []*store.Record
if keyval == nil || len(keyval.Kvs) == 0 {
return vals, nil
}
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 ...options.Option) store.Store {
options := options.NewOptions(opts...)
var endpoints []string
if e, ok := options.Values().Get("store.nodes"); ok {
endpoints = e.([]string)
}
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),
}
}