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= 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" }