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etcdclient.go
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etcdclient.go
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package kvstores
import (
"encoding/json"
"errors"
"log"
"net/http"
"time"
"strings"
api "github.com/coreos/go-etcd/etcd"
)
type EtcdClient struct {
client *api.Client
}
func NewEtcdClient(machines []string, cert, certKey string, caKeys string,
dialTimeout time.Duration) (*EtcdClient, error) {
var c *api.Client
var err error
// create client, using tls if required
if cert != "" && certKey != "" {
c, err = api.NewTLSClient(machines, cert, certKey, caKeys)
if err != nil {
return nil, err
}
} else {
c = api.NewClient(machines)
}
// configure dial timeout
c.SetDialTimeout(dialTimeout)
// updates cluster information using the given machine list.
success := c.SetCluster(machines)
if !success {
return nil, errors.New("cannot connect to etcd cluster: " + strings.Join(machines, ","))
}
return &EtcdClient{c}, nil
}
func (c *EtcdClient) Create(path string, data string) (err *Error) {
_, err = rawCall(func() (*api.RawResponse, error) {
return c.client.RawCreate(path, data, 0)
}, nil)
return
}
func (c *EtcdClient) Delete(path string, version int32) (err *Error) {
_, err = rawCall(func() (*api.RawResponse, error) {
if (version == -1) {
return c.client.RawDelete(path, false, false)
} else {
return c.client.RawCompareAndDelete(path, "", uint64(version))
}
}, nil)
return
}
func (c *EtcdClient) Exists(path string) (err *Error) {
_, err = rawCall(func() (*api.RawResponse, error) {
return c.client.RawGet(path, true, false)
}, nil)
return
}
func (c *EtcdClient) GetData(path string) (*Node, *Error) {
return rawCall(
func() (*api.RawResponse, error) {
return c.client.RawGet(path, true, false)
},
func(resp *api.Response) *Error {
if (resp.Node.Dir) {
return &Error { code: KeyNotFound }
}
return nil
},
)
}
func (c *EtcdClient) SetData(path string, data string, version int32) (err *Error) {
_, err = rawCall(func() (*api.RawResponse, error) {
if (version == -1) {
return c.client.RawUpdate(path, data, 0)
} else {
return c.client.RawCompareAndSwap(path, data, 0, "", uint64(version))
}
}, nil)
return
}
func (c *EtcdClient) GetChildren(path string) ([]string, *Error) {
node, err := rawCall(func() (*api.RawResponse, error) {
return c.client.RawGet(path, true, false)
}, nil)
if (err != nil) {
return nil, err
}
numChildren := len(node.Nodes)
children := make([]string, len(node.Nodes))
for i := 0; i < numChildren; i++ {
children[i] = node.Nodes[i].Path
}
return children, nil
}
func mapNode(etcdNode *api.Node) *Node {
node := &Node{
Path: etcdNode.Key,
Value: etcdNode.Value,
CreatedIndex: etcdNode.CreatedIndex,
ModifiedIndex: etcdNode.ModifiedIndex,
}
numChildren := len(etcdNode.Nodes)
node.Nodes = make(Nodes, numChildren)
for i := 0; i < numChildren; i++ {
node.Nodes[i] = mapNode(etcdNode.Nodes[i])
}
return node
}
func rawCall(f func() (*api.RawResponse, error), v func(*api.Response) *Error) (*Node, *Error) {
rawResp, cerr := f()
if cerr != nil {
return nil, &Error { code: BackendUnreachable, msg: cerr.Error() }
}
if rawResp.StatusCode != http.StatusOK && rawResp.StatusCode != http.StatusCreated {
etcdError := new(api.EtcdError)
json.Unmarshal(rawResp.Body, etcdError)
var code int = Unknown
switch etcdError.ErrorCode {
case 100: // EcodeKeyNotFound
code = KeyNotFound
case 101: // EcodeTestFailed
code = BadVersion
case 102: // EcodeNotFile
code = KeyNotFound
case 105: // EcodeNodeExist
code = KeyExists
case 107: // EcodeRootROnly
// TODO: Decide which error should be triggered
code = KeyNotFound
default:
log.Printf("unhandled error: http: %d, etcd: %d", rawResp.StatusCode, etcdError.ErrorCode)
}
return nil, &Error { code: code }
}
resp, cerr := rawResp.Unmarshal()
if cerr != nil {
return nil, &Error { code: Unknown }
}
if (v != nil) {
err := v(resp)
if err != nil {
return nil, err
}
}
return mapNode(resp.Node), nil
}