refactor: support close admin-cli client

#2160

Current admin-cli client does not provide an interface to
close replica server TCP connections.
And the QueryAllNodesDiskInfo function is difficult to use.
SendQueryDiskInfoRequest function is private.

admin-cli/executor/client.go

@@ -23,6 +23,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"strings"
 
 	"github.com/apache/incubator-pegasus/admin-cli/client"
 	"github.com/apache/incubator-pegasus/admin-cli/util"
@@ -45,6 +46,7 @@ type Client struct {
 }
 
 // NewClient creates a client for accessing Pegasus cluster for use of admin-cli.
+// This function will call os.Exit.
 func NewClient(writer io.Writer, metaAddrs []string) *Client {
 	meta := client.NewRPCBasedMeta(metaAddrs)
 
@@ -67,3 +69,46 @@ func NewClient(writer io.Writer, metaAddrs []string) *Client {
 		Perf:   aggregate.NewPerfClient(metaAddrs),
 	}
 }
+
+// NewClientWithoutExit creates a client for accessing Pegasus cluster for use of admin-cli.
+// This function will not call os.Exit.
+func NewClientWithoutExit(writer io.Writer, metaAddrs []string) (*Client, error) {
+	meta := client.NewRPCBasedMeta(metaAddrs)
+
+	nodes, err := meta.ListNodes()
+	if err != nil {
+		fmt.Fprintf(writer, "fatal: failed to list nodes [%s]\n", err)
+		return nil, fmt.Errorf("fatal: failed to list nodes [%s]", err)
+	}
+
+	var replicaAddrs []string
+	for _, node := range nodes {
+		replicaAddrs = append(replicaAddrs, node.Address.GetAddress())
+	}
+
+	return &Client{
+		Writer: writer,
+		Meta:   meta,
+		Nodes:  util.NewPegasusNodeManager(metaAddrs, replicaAddrs),
+		Perf:   aggregate.NewPerfClient(metaAddrs),
+	}, nil
+}
+
+func CloseClient(writer io.Writer, client *Client) error {
+	var errorStrings []string
+	err := client.Meta.Close()
+	if err != nil {
+		fmt.Fprintf(writer, "fatal: failed to close meta session [%s]\n", err)
+		errorStrings = append(errorStrings, err.Error())
+	}
+
+	client.Perf.Close()
+
+	err = client.Nodes.CloseAllNodes()
+	if err != nil {
+		fmt.Fprintf(writer, "fatal: failed to close nodes session [%s]\n", err)
+		errorStrings = append(errorStrings, err.Error())
+	}
+
+	return fmt.Errorf("%s", strings.Join(errorStrings, "\n"))
+}

admin-cli/executor/disk_info.go

@@ -22,10 +22,12 @@ package executor
 import (
 	"context"
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/apache/incubator-pegasus/admin-cli/tabular"
 	"github.com/apache/incubator-pegasus/admin-cli/util"
+	"github.com/apache/incubator-pegasus/go-client/idl/admin"
 	"github.com/apache/incubator-pegasus/go-client/idl/base"
 	"github.com/apache/incubator-pegasus/go-client/idl/radmin"
 	"github.com/apache/incubator-pegasus/go-client/session"
@@ -45,7 +47,7 @@ func QueryDiskInfo(client *Client, infoType DiskInfoType, replicaServer string,
 }
 
 func GetDiskInfo(client *Client, infoType DiskInfoType, replicaServer string, tableName string, diskTag string, print bool) ([]interface{}, error) {
-	resp, err := sendQueryDiskInfoRequest(client, replicaServer, tableName)
+	resp, err := SendQueryDiskInfoRequest(client, replicaServer, tableName)
 	if err != nil {
 		return nil, err
 	}
@@ -60,7 +62,7 @@ func GetDiskInfo(client *Client, infoType DiskInfoType, replicaServer string, ta
 	}
 }
 
-func sendQueryDiskInfoRequest(client *Client, replicaServer string, tableName string) (*radmin.QueryDiskInfoResponse, error) {
+func SendQueryDiskInfoRequest(client *Client, replicaServer string, tableName string) (*radmin.QueryDiskInfoResponse, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
 	defer cancel()
 
@@ -88,7 +90,7 @@ func QueryAllNodesDiskInfo(client *Client, tableName string) (map[string]*radmin
 	}
 	for _, nodeInfo := range nodeInfos {
 		address := nodeInfo.GetAddress().GetAddress()
-		resp, err := sendQueryDiskInfoRequest(client, address, tableName)
+		resp, err := SendQueryDiskInfoRequest(client, address, tableName)
 		if err != nil {
 			return respMap, err
 		}
@@ -97,6 +99,31 @@ func QueryAllNodesDiskInfo(client *Client, tableName string) (map[string]*radmin
 	return respMap, nil
 }
 
+func QueryAliveNodesDiskInfo(client *Client, tableName string) (map[string]*radmin.QueryDiskInfoResponse, error) {
+	respMap := make(map[string]*radmin.QueryDiskInfoResponse)
+	nodeInfos, err := client.Meta.ListNodes()
+	if err != nil {
+		return respMap, err
+	}
+	for _, nodeInfo := range nodeInfos {
+		if nodeInfo.Status != admin.NodeStatus_NS_ALIVE {
+			continue
+		}
+		address := nodeInfo.GetAddress().GetAddress()
+		resp, err := SendQueryDiskInfoRequest(client, address, tableName)
+		if err != nil {
+			// this replica server haven't the table partition.
+			if strings.Contains(err.Error(), "ERR_OBJECT_NOT_FOUND") {
+				continue
+			} else {
+				return respMap, err
+			}
+		}
+		respMap[address] = resp
+	}
+	return respMap, nil
+}
+
 type DiskCapacityStruct struct {
 	Disk     string `json:"disk"`
 	Capacity int64  `json:"capacity"`

admin-cli/util/pegasus_node.go

@@ -84,6 +84,14 @@ func (n *PegasusNode) RPCAddress() *base.RPCAddress {
 	return base.NewRPCAddress(n.IP, n.Port)
 }
 
+func (n *PegasusNode) Close() error {
+	if n.session != nil {
+		return n.session.Close()
+	} else {
+		return nil
+	}
+}
+
 // NewNodeFromTCPAddr creates a node from tcp address.
 // NOTE:
 //   - Will not initialize TCP connection unless needed.
@@ -211,3 +219,17 @@ func (m *PegasusNodeManager) GetPerfSession(addr string, ntype session.NodeType)
 
 	return aggregate.WrapPerf(addr, node.session)
 }
+
+func (m *PegasusNodeManager) CloseAllNodes() error {
+	var errorStrings []string
+	for _, n := range m.nodes {
+		err := n.Close()
+		if err != nil {
+			errorStrings = append(errorStrings, err.Error())
+		}
+	}
+	if len(errorStrings) != 0 {
+		return fmt.Errorf("%s", strings.Join(errorStrings, "\n"))
+	}
+	return nil
+}