adding etcd storage support for cluster meta data. Currently just

sequence. More to come...

go/metastore/etcd_backing.go

@@ -0,0 +1,51 @@
+package metastore
+
+import (
+	"code.google.com/p/weed-fs/go/glog"
+	"errors"
+	"github.com/coreos/go-etcd/etcd"
+	"strings"
+)
+
+// store data on etcd
+
+type MetaStoreEtcdBacking struct {
+	client *etcd.Client
+}
+
+func NewMetaStoreEtcdBacking(etcdCluster string) *MetaStoreEtcdBacking {
+	m := &MetaStoreEtcdBacking{}
+	m.client = etcd.NewClient(strings.Split(etcdCluster, ","))
+	return m
+}
+
+func (m MetaStoreEtcdBacking) Set(path, val string) error {
+	res, e := m.client.Set(path, val, 0)
+	glog.V(0).Infof("etcd set response: %+v\n", res)
+	return e
+}
+
+func (m MetaStoreEtcdBacking) Get(path string) (string, error) {
+	results, err := m.client.Get(path)
+	for i, res := range results {
+		glog.V(0).Infof("[%d] get response: %+v\n", i, res)
+	}
+	if err != nil {
+		return "", err
+	}
+	if results[0].Key != path {
+		return "", errors.New("Key Not Found:" + path)
+	}
+	return results[0].Value, nil
+}
+
+func (m MetaStoreEtcdBacking) Has(path string) (ok bool) {
+	results, err := m.client.Get(path)
+	if err != nil {
+		return false
+	}
+	if results[0].Key != path {
+		return false
+	}
+	return true
+}