Integrate public as bindata optionally (#293)

* Dropped unused codekit config

* Integrated dynamic and static bindata for public

* Ignore public bindata

* Add a general generate make task

* Integrated flexible public assets into web command

* Updated vendoring, added all missiong govendor deps

* Made the linter happy with the bindata and dynamic code

* Moved public bindata definition to modules directory

* Ignoring the new bindata path now

* Updated to the new public modules import path

* Updated public bindata command and drop the new prefix

vendor/github.com/ngaut/tso/util/util.go

@@ -0,0 +1,81 @@
+// Copyright 2015 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package util
+
+import (
+	"encoding/json"
+	"path"
+
+	"github.com/juju/errors"
+	"github.com/ngaut/go-zookeeper/zk"
+	"github.com/ngaut/zkhelper"
+)
+
+func getLeader(data []byte) (string, error) {
+	m := struct {
+		Addr string `json:"Addr"`
+	}{}
+
+	err := json.Unmarshal(data, &m)
+	if err != nil {
+		return "", errors.Trace(err)
+	}
+
+	return m.Addr, nil
+}
+
+// getLeaderPath gets the leader path in zookeeper.
+func getLeaderPath(rootPath string) string {
+	return path.Join(rootPath, "leader")
+}
+
+// func checkLeaderExists(conn zkhelper.Conn) error {
+//  // the leader node is not ephemeral, so we may meet no any tso server but leader node
+//  // has the data for last closed tso server.
+//  // TODO: check children in /candidates, if no child, we will treat it as no leader too.
+
+//  return nil
+// }
+
+// GetLeaderAddr gets the leader tso address in zookeeper for outer use.
+func GetLeader(conn zkhelper.Conn, rootPath string) (string, error) {
+	data, _, err := conn.Get(getLeaderPath(rootPath))
+	if err != nil {
+		return "", errors.Trace(err)
+	}
+
+	// if err != checkLeaderExists(conn); err != nil {
+	//  return "", errors.Trace(err)
+	// }
+
+	return getLeader(data)
+}
+
+// GetWatchLeader gets the leader tso address in zookeeper and returns a watcher for leader change.
+func GetWatchLeader(conn zkhelper.Conn, rootPath string) (string, <-chan zk.Event, error) {
+	data, _, watcher, err := conn.GetW(getLeaderPath(rootPath))
+	if err != nil {
+		return "", nil, errors.Trace(err)
+	}
+	addr, err := getLeader(data)
+	if err != nil {
+		return "", nil, errors.Trace(err)
+	}
+
+	// if err != checkLeaderExists(conn); err != nil {
+	//  return "", errors.Trace(err)
+	// }
+
+	return addr, watcher, nil
+}