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members.go
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members.go
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package command
import (
"flag"
"fmt"
"github.com/hashicorp/consul/command/agent"
"github.com/mitchellh/cli"
"github.com/ryanuber/columnize"
"net"
"regexp"
"strings"
)
// MembersCommand is a Command implementation that queries a running
// Consul agent what members are part of the cluster currently.
type MembersCommand struct {
Ui cli.Ui
}
func (c *MembersCommand) Help() string {
helpText := `
Usage: consul members [options]
Outputs the members of a running Consul agent.
Options:
-detailed Provides detailed information about nodes
-rpc-addr=127.0.0.1:8400 RPC address of the Consul agent.
-status=<regexp> If provided, output is filtered to only nodes matching
the regular expression for status
-wan If the agent is in server mode, this can be used to return
the other peers in the WAN pool
`
return strings.TrimSpace(helpText)
}
func (c *MembersCommand) Run(args []string) int {
var detailed bool
var wan bool
var statusFilter string
cmdFlags := flag.NewFlagSet("members", flag.ContinueOnError)
cmdFlags.Usage = func() { c.Ui.Output(c.Help()) }
cmdFlags.BoolVar(&detailed, "detailed", false, "detailed output")
cmdFlags.BoolVar(&wan, "wan", false, "wan members")
cmdFlags.StringVar(&statusFilter, "status", ".*", "status filter")
rpcAddr := RPCAddrFlag(cmdFlags)
if err := cmdFlags.Parse(args); err != nil {
return 1
}
// Compile the regexp
statusRe, err := regexp.Compile(statusFilter)
if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to compile status regexp: %v", err))
return 1
}
client, err := RPCClient(*rpcAddr)
if err != nil {
c.Ui.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
return 1
}
defer client.Close()
var members []agent.Member
if wan {
members, err = client.WANMembers()
} else {
members, err = client.LANMembers()
}
if err != nil {
c.Ui.Error(fmt.Sprintf("Error retrieving members: %s", err))
return 1
}
// Filter the results
n := len(members)
for i := 0; i < n; i++ {
member := members[i]
if !statusRe.MatchString(member.Status) {
members[i], members[n-1] = members[n-1], members[i]
i--
n--
continue
}
}
members = members[:n]
// No matching members
if len(members) == 0 {
return 2
}
// Generate the output
var result []string
if detailed {
result = c.detailedOutput(members)
} else {
result = c.standardOutput(members)
}
// Generate the columnized version
output := columnize.SimpleFormat(result)
c.Ui.Output(string(output))
return 0
}
// standardOutput is used to dump the most useful information about nodes
// in a more human-friendly format
func (c *MembersCommand) standardOutput(members []agent.Member) []string {
result := make([]string, 0, len(members))
header := "Node|Address|Status|Type|Build|Protocol"
result = append(result, header)
for _, member := range members {
addr := net.TCPAddr{IP: member.Addr, Port: int(member.Port)}
protocol := member.Tags["vsn"]
build := member.Tags["build"]
if build == "" {
build = "< 0.3"
} else if idx := strings.Index(build, ":"); idx != -1 {
build = build[:idx]
}
switch member.Tags["role"] {
case "node":
line := fmt.Sprintf("%s|%s|%s|client|%s|%s",
member.Name, addr.String(), member.Status, build, protocol)
result = append(result, line)
case "consul":
line := fmt.Sprintf("%s|%s|%s|server|%s|%s",
member.Name, addr.String(), member.Status, build, protocol)
result = append(result, line)
default:
line := fmt.Sprintf("%s|%s|%s|unknown||",
member.Name, addr.String(), member.Status)
result = append(result, line)
}
}
return result
}
// detailedOutput is used to dump all known information about nodes in
// their raw format
func (c *MembersCommand) detailedOutput(members []agent.Member) []string {
result := make([]string, 0, len(members))
header := "Node|Address|Status|Tags"
result = append(result, header)
for _, member := range members {
// Format the tags as tag1=v1,tag2=v2,...
var tagPairs []string
for name, value := range member.Tags {
tagPairs = append(tagPairs, fmt.Sprintf("%s=%s", name, value))
}
tags := strings.Join(tagPairs, ",")
addr := net.TCPAddr{IP: member.Addr, Port: int(member.Port)}
line := fmt.Sprintf("%s|%s|%s|%s",
member.Name, addr.String(), member.Status, tags)
result = append(result, line)
}
return result
}
func (c *MembersCommand) Synopsis() string {
return "Lists the members of a Consul cluster"
}