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catalog_list_nodes.go
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/
catalog_list_nodes.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package nodes
import (
"flag"
"fmt"
"io"
"github.com/hashicorp/consul/command/catalog"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/consul/command/flags"
"github.com/hashicorp/consul/command/helpers"
"github.com/mitchellh/cli"
"github.com/ryanuber/columnize"
)
func New(ui cli.Ui) *cmd {
c := &cmd{UI: ui}
c.init()
return c
}
type cmd struct {
UI cli.Ui
flags *flag.FlagSet
http *flags.HTTPFlags
help string
// flags
detailed bool
near string
nodeMeta map[string]string
service string
filter string
testStdin io.Reader
}
// init sets up command flags and help text
func (c *cmd) init() {
c.flags = flag.NewFlagSet("", flag.ContinueOnError)
c.flags.StringVar(&c.filter, "filter", "", "Filter to use with the request")
c.flags.BoolVar(&c.detailed, "detailed", false, "Output detailed information about "+
"the nodes including their addresses and metadata.")
c.flags.StringVar(&c.near, "near", "", "Node name to sort the node list in ascending "+
"order based on estimated round-trip time from that node. "+
"Passing \"_agent\" will use this agent's node for sorting.")
c.flags.Var((*flags.FlagMapValue)(&c.nodeMeta), "node-meta", "Metadata to "+
"filter nodes with the given `key=value` pairs. This flag may be "+
"specified multiple times to filter on multiple sources of metadata.")
c.flags.StringVar(&c.service, "service", "", "Service `id or name` to filter nodes. "+
"Only nodes which are providing the given service will be returned.")
c.http = &flags.HTTPFlags{}
flags.Merge(c.flags, c.http.ClientFlags())
flags.Merge(c.flags, c.http.ServerFlags())
flags.Merge(c.flags, c.http.PartitionFlag())
c.help = flags.Usage(help, c.flags)
}
func (c *cmd) Run(args []string) int {
if err := c.flags.Parse(args); err != nil {
return 1
}
if l := len(c.flags.Args()); l > 0 {
c.UI.Error(fmt.Sprintf("Too many arguments (expected 0, got %d)", l))
return 1
}
// Create and test the HTTP client
client, err := c.http.APIClient()
if err != nil {
c.UI.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
return 1
}
if c.filter != "" {
data, err := helpers.LoadDataSource(c.filter, c.testStdin)
if err != nil {
c.UI.Error(fmt.Sprintf("Could not process filter argument: %v", err))
return 1
}
c.filter = data
}
var nodes []*api.Node
if c.service != "" {
services, _, err := client.Catalog().Service(c.service, "", &api.QueryOptions{
Near: c.near,
NodeMeta: c.nodeMeta,
Filter: c.filter,
})
if err != nil {
c.UI.Error(fmt.Sprintf("Error listing nodes for service: %s", err))
return 1
}
nodes = make([]*api.Node, len(services))
for i, s := range services {
nodes[i] = &api.Node{
ID: s.ID,
Node: s.Node,
Address: s.Address,
Datacenter: s.Datacenter,
TaggedAddresses: s.TaggedAddresses,
Meta: s.NodeMeta,
CreateIndex: s.CreateIndex,
ModifyIndex: s.ModifyIndex,
}
}
} else {
nodes, _, err = client.Catalog().Nodes(&api.QueryOptions{
Near: c.near,
NodeMeta: c.nodeMeta,
Filter: c.filter,
})
if err != nil {
c.UI.Error(fmt.Sprintf("Error listing nodes: %s", err))
return 1
}
}
// Handle the edge case where there are no nodes that match the query.
if len(nodes) == 0 {
c.UI.Error("No nodes match the given query - try expanding your search.")
return 0
}
output, err := printNodes(nodes, c.detailed)
if err != nil {
c.UI.Error(fmt.Sprintf("Error printing nodes: %s", err))
return 1
}
c.UI.Info(output)
return 0
}
// printNodes accepts a list of nodes and prints information in a tabular
// format about the nodes.
func printNodes(nodes []*api.Node, detailed bool) (string, error) {
var result []string
result = detailedNodes(nodes, detailed)
return columnize.Format(result, &columnize.Config{Delim: string([]byte{0x1f})}), nil
}
func detailedNodes(nodes []*api.Node, detailed bool) []string {
result := make([]string, 0, len(nodes)+1)
header := catalog.NodesHeader(detailed)
result = append(result, header)
for _, node := range nodes {
result = append(result, catalog.NodeRow(node, detailed))
}
return result
}
func (c *cmd) Synopsis() string {
return synopsis
}
func (c *cmd) Help() string {
return c.help
}
const synopsis = "Lists all nodes in the given datacenter"
const help = `
Usage: consul catalog nodes [options]
Retrieves the list nodes registered in a given datacenter. By default, the
datacenter of the local agent is queried.
To retrieve the list of nodes:
$ consul catalog nodes
To print detailed information including full node IDs, tagged addresses, and
metadata information:
$ consul catalog nodes -detailed
To list nodes which are running a particular service:
$ consul catalog nodes -service=web
To filter by node metadata:
$ consul catalog nodes -node-meta="foo=bar"
To sort nodes by estimated round-trip time from node-web:
$ consul catalog nodes -near=node-web
For a full list of options and examples, please see the Consul documentation.
`