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package consul
import (
"fmt"
"strings"
"time"
"github.com/xordataexchange/crypt/backend"
"github.com/armon/consul-api"
)
type Client struct {
client *consulapi.KV
waitIndex uint64
}
func New(machines []string) (*Client, error) {
conf := consulapi.DefaultConfig()
if len(machines) > 0 {
conf.Address = machines[0]
}
client, err := consulapi.NewClient(conf)
if err != nil {
return nil, err
}
return &Client{client.KV(), 0}, nil
}
func (c *Client) Get(key string) ([]byte, error) {
kv, _, err := c.client.Get(key, nil)
if err != nil {
return nil, err
}
if kv == nil {
return nil, fmt.Errorf("Key ( %s ) was not found.", key)
}
return kv.Value, nil
}
func (c *Client) List(key string) (backend.KVPairs, error) {
pairs, _, err := c.client.List(key, nil)
if err != nil {
return nil, err
}
if err != nil {
return nil, err
}
ret := make(backend.KVPairs, len(pairs), len(pairs))
for i, kv := range pairs {
ret[i] = &backend.KVPair{Key: kv.Key, Value: kv.Value}
}
return ret, nil
}
func (c *Client) Set(key string, value []byte) error {
key = strings.TrimPrefix(key, "/")
kv := &consulapi.KVPair{
Key: key,
Value: value,
}
_, err := c.client.Put(kv, nil)
return err
}
func (c *Client) Watch(key string, stop chan bool) <-chan *backend.Response {
respChan := make(chan *backend.Response, 0)
go func() {
for {
opts := consulapi.QueryOptions{
WaitIndex: c.waitIndex,
}
keypair, meta, err := c.client.Get(key, &opts)
if keypair == nil && err == nil {
err = fmt.Errorf("Key ( %s ) was not found.", key)
}
if err != nil {
respChan <- &backend.Response{nil, err}
time.Sleep(time.Second * 5)
continue
}
c.waitIndex = meta.LastIndex
respChan <- &backend.Response{keypair.Value, nil}
}
}()
return respChan
}
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