1package command
2
3import (
4	"flag"
5	"fmt"
6	"github.com/mitchellh/cli"
7	"strings"
8)
9
10// JoinCommand is a Command implementation that tells a running Serf
11// agent to join another.
12type JoinCommand struct {
13	Ui cli.Ui
14}
15
16func (c *JoinCommand) Help() string {
17	helpText := `
18Usage: serf join [options] address ...
19
20  Tells a running Serf agent (with "serf agent") to join the cluster
21  by specifying at least one existing member.
22
23Options:
24
25  -replay                   Replay past user events.
26  -rpc-addr=127.0.0.1:7373  RPC address of the Serf agent.
27  -rpc-auth=""              RPC auth token of the Serf agent.
28`
29	return strings.TrimSpace(helpText)
30}
31
32func (c *JoinCommand) Run(args []string) int {
33	var replayEvents bool
34
35	cmdFlags := flag.NewFlagSet("join", flag.ContinueOnError)
36	cmdFlags.Usage = func() { c.Ui.Output(c.Help()) }
37	cmdFlags.BoolVar(&replayEvents, "replay", false, "replay")
38	rpcAddr := RPCAddrFlag(cmdFlags)
39	rpcAuth := RPCAuthFlag(cmdFlags)
40	if err := cmdFlags.Parse(args); err != nil {
41		return 1
42	}
43
44	addrs := cmdFlags.Args()
45	if len(addrs) == 0 {
46		c.Ui.Error("At least one address to join must be specified.")
47		c.Ui.Error("")
48		c.Ui.Error(c.Help())
49		return 1
50	}
51
52	client, err := RPCClient(*rpcAddr, *rpcAuth)
53	if err != nil {
54		c.Ui.Error(fmt.Sprintf("Error connecting to Serf agent: %s", err))
55		return 1
56	}
57	defer client.Close()
58
59	n, err := client.Join(addrs, replayEvents)
60	if err != nil {
61		c.Ui.Error(fmt.Sprintf("Error joining the cluster: %s", err))
62		return 1
63	}
64
65	c.Ui.Output(fmt.Sprintf(
66		"Successfully joined cluster by contacting %d nodes.", n))
67	return 0
68}
69
70func (c *JoinCommand) Synopsis() string {
71	return "Tell Serf agent to join cluster"
72}
73