/
etcc.go
98 lines (84 loc) · 2.67 KB
/
etcc.go
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package etcc
import (
"fmt"
"net/url"
"strings"
"time"
"github.com/coreos/etcd/client"
"github.com/coreos/etcd/pkg/transport"
"golang.org/x/net/context"
)
type Etcd struct {
api client.KeysAPI
}
// New trys to connect to etcd server. endpoints must be addreses
// delimited by comma, like "http://127.0.0.1:4001,http://127.0.0.1:2379".
func New(endpoints string) (*Etcd, error) {
eps := strings.Split(endpoints, ",")
for i, ep := range eps {
u, e := url.Parse(ep)
if e != nil {
return nil, fmt.Errorf("url.Parse: %v", e)
}
if u.Scheme == "" {
u.Scheme = "http"
}
eps[i] = u.String()
}
tr, e := transport.NewTransport(transport.TLSInfo{},
10*time.Second) // timeout = 10sec
if e != nil {
return nil, fmt.Errorf("transport.NewTransport: %v", e)
}
c, e := client.New(client.Config{Endpoints: eps, Transport: tr})
if e != nil {
return nil, fmt.Errorf("client.New: %v", e)
}
ctx, cancel := context.WithTimeout(context.Background(), client.DefaultRequestTimeout)
e = c.Sync(ctx)
cancel()
if e != nil {
return nil, fmt.Errorf("(etc)client.Sync: %v", e)
}
return &Etcd{client.NewKeysAPI(c)}, nil
}
// Mkdir creates a directory. The directory could be multiple-level,
// like /home/yi/hello. But it must not exist before; otherwise Mkdir
// returns an error.
func (c *Etcd) Mkdir(dir string) error {
ctx, cancel := context.WithTimeout(context.Background(), client.DefaultRequestTimeout)
defer cancel()
if _, e := c.api.Set(ctx, dir, "", &client.SetOptions{Dir: true, PrevExist: client.PrevNoExist}); e != nil {
return fmt.Errorf("Etcd.Mkdir: %v", e)
}
return nil
}
func (c *Etcd) SetWithTTL(key, value string, ttl time.Duration) error {
ctx, cancel := context.WithTimeout(context.Background(), client.DefaultRequestTimeout)
defer cancel()
if _, e := c.api.Set(ctx, key, value, &client.SetOptions{TTL: ttl}); e != nil {
return fmt.Errorf("Etcd.Set: %v", e)
}
return nil
}
func (c *Etcd) Set(key, value string) error {
return c.SetWithTTL(key, value, time.Duration(0))
}
func (c *Etcd) Get(key string) (string, error) {
ctx, cancel := context.WithTimeout(context.Background(), client.DefaultRequestTimeout)
defer cancel()
r, e := c.api.Get(ctx, key, &client.GetOptions{Sort: true})
if e != nil {
return "", fmt.Errorf("Etcd.Get: %v", e)
}
return r.Node.Value, nil
}
// Rmdir removes a directory and recursively its all content, like bash command `rm -rf`.
func (c *Etcd) Rmdir(dir string) error {
ctx, cancel := context.WithTimeout(context.Background(), client.DefaultRequestTimeout)
defer cancel()
if _, e := c.api.Delete(ctx, dir, &client.DeleteOptions{Dir: true, Recursive: true}); e != nil {
return fmt.Errorf("Etcd.Rmdir: %v", e)
}
return nil
}