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members.go
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members.go
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package command
import (
"fmt"
"net"
"regexp"
"sort"
"strings"
consulapi "github.com/hashicorp/consul/api"
"github.com/hashicorp/serf/serf"
"github.com/ryanuber/columnize"
)
// MembersCommand is a Command implementation that queries a running
// Consul agent what members are part of the cluster currently.
type MembersCommand struct {
BaseCommand
}
func (c *MembersCommand) Help() string {
helpText := `
Usage: consul members [options]
Outputs the members of a running Consul agent.
` + c.BaseCommand.Help()
return strings.TrimSpace(helpText)
}
func (c *MembersCommand) Run(args []string) int {
var detailed bool
var wan bool
var statusFilter string
f := c.BaseCommand.NewFlagSet(c)
f.BoolVar(&detailed, "detailed", false,
"Provides detailed information about nodes.")
f.BoolVar(&wan, "wan", false,
"If the agent is in server mode, this can be used to return the other "+
"peers in the WAN pool.")
f.StringVar(&statusFilter, "status", ".*",
"If provided, output is filtered to only nodes matching the regular "+
"expression for status.")
if err := c.BaseCommand.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 := c.BaseCommand.HTTPClient()
if err != nil {
c.UI.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
return 1
}
members, err := client.Agent().Members(wan)
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]
statusString := serf.MemberStatus(member.Status).String()
if !statusRe.MatchString(statusString) {
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
}
sort.Sort(ByMemberName(members))
// 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(output)
return 0
}
// so we can sort members by name
type ByMemberName []*consulapi.AgentMember
func (m ByMemberName) Len() int { return len(m) }
func (m ByMemberName) Swap(i, j int) { m[i], m[j] = m[j], m[i] }
func (m ByMemberName) Less(i, j int) bool { return m[i].Name < m[j].Name }
// standardOutput is used to dump the most useful information about nodes
// in a more human-friendly format
func (c *MembersCommand) standardOutput(members []*consulapi.AgentMember) []string {
result := make([]string, 0, len(members))
header := "Node|Address|Status|Type|Build|Protocol|DC"
result = append(result, header)
for _, member := range members {
addr := net.TCPAddr{IP: net.ParseIP(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]
}
dc := member.Tags["dc"]
statusString := serf.MemberStatus(member.Status).String()
switch member.Tags["role"] {
case "node":
line := fmt.Sprintf("%s|%s|%s|client|%s|%s|%s",
member.Name, addr.String(), statusString, build, protocol, dc)
result = append(result, line)
case "consul":
line := fmt.Sprintf("%s|%s|%s|server|%s|%s|%s",
member.Name, addr.String(), statusString, build, protocol, dc)
result = append(result, line)
default:
line := fmt.Sprintf("%s|%s|%s|unknown|||",
member.Name, addr.String(), statusString)
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 []*consulapi.AgentMember) []string {
result := make([]string, 0, len(members))
header := "Node|Address|Status|Tags"
result = append(result, header)
for _, member := range members {
// Get the tags sorted by key
tagKeys := make([]string, 0, len(member.Tags))
for key := range member.Tags {
tagKeys = append(tagKeys, key)
}
sort.Strings(tagKeys)
// Format the tags as tag1=v1,tag2=v2,...
var tagPairs []string
for _, key := range tagKeys {
tagPairs = append(tagPairs, fmt.Sprintf("%s=%s", key, member.Tags[key]))
}
tags := strings.Join(tagPairs, ",")
addr := net.TCPAddr{IP: net.ParseIP(member.Addr), Port: int(member.Port)}
line := fmt.Sprintf("%s|%s|%s|%s",
member.Name, addr.String(), serf.MemberStatus(member.Status).String(), tags)
result = append(result, line)
}
return result
}
func (c *MembersCommand) Synopsis() string {
return "Lists the members of a Consul cluster"
}