open-consul/command/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"
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"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:
-role=<regexp> If provided, output is filtered to only nodes matching
the regular expression for role
-rpc-addr=127.0.0.1:8400 RPC address of the Consul agent.
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-status=<regexp> If provided, output is filtered to only nodes matching
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the regular expression for status
-wan If the agent is in server mode, this can be used to return
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the other peers in the WAN pool
`
return strings.TrimSpace(helpText)
}
func (c *MembersCommand) Run(args []string) int {
var wan bool
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var roleFilter, statusFilter string
cmdFlags := flag.NewFlagSet("members", flag.ContinueOnError)
cmdFlags.Usage = func() { c.Ui.Output(c.Help()) }
cmdFlags.BoolVar(&wan, "wan", false, "wan members")
cmdFlags.StringVar(&roleFilter, "role", ".*", "role filter")
cmdFlags.StringVar(&statusFilter, "status", ".*", "status filter")
rpcAddr := RPCAddrFlag(cmdFlags)
if err := cmdFlags.Parse(args); err != nil {
return 1
}
// Compile the regexp
roleRe, err := regexp.Compile(roleFilter)
if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to compile role regexp: %v", err))
return 1
}
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
}
result := make([]string, 0, len(members))
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for _, member := range members {
// Skip the non-matching members
if !roleRe.MatchString(member.Tags["role"]) || !statusRe.MatchString(member.Status) {
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continue
}
// 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, ",")
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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)
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}
// No matching members
if len(result) == 0 {
return 2
}
// Generate the columnized version
output := columnize.SimpleFormat(result)
c.Ui.Output(string(output))
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return 0
}
func (c *MembersCommand) Synopsis() string {
return "Lists the members of a Consul cluster"
}