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|
package command
import (
"bytes"
"flag"
"fmt"
"github.com/mitchellh/cli"
"sort"
"strings"
)
// InfoCommand is a Command implementation that queries a running
// Serf agent for various debugging statistics for operators
type InfoCommand struct {
Ui cli.Ui
}
func (i *InfoCommand) Help() string {
helpText := `
Usage: serf info [options]
Provides debugging information for operators
Options:
-format If provided, output is returned in the specified
format. Valid formats are 'json', and 'text' (default)
-rpc-addr=127.0.0.1:7373 RPC address of the Serf agent.
-rpc-auth="" RPC auth token of the Serf agent.
`
return strings.TrimSpace(helpText)
}
func (i *InfoCommand) Run(args []string) int {
var format string
cmdFlags := flag.NewFlagSet("info", flag.ContinueOnError)
cmdFlags.Usage = func() { i.Ui.Output(i.Help()) }
cmdFlags.StringVar(&format, "format", "text", "output format")
rpcAddr := RPCAddrFlag(cmdFlags)
rpcAuth := RPCAuthFlag(cmdFlags)
if err := cmdFlags.Parse(args); err != nil {
return 1
}
client, err := RPCClient(*rpcAddr, *rpcAuth)
if err != nil {
i.Ui.Error(fmt.Sprintf("Error connecting to Serf agent: %s", err))
return 1
}
defer client.Close()
stats, err := client.Stats()
if err != nil {
i.Ui.Error(fmt.Sprintf("Error querying agent: %s", err))
return 1
}
output, err := formatOutput(StatsContainer(stats), format)
if err != nil {
i.Ui.Error(fmt.Sprintf("Encoding error: %s", err))
return 1
}
i.Ui.Output(string(output))
return 0
}
func (i *InfoCommand) Synopsis() string {
return "Provides debugging information for operators"
}
type StatsContainer map[string]map[string]string
func (s StatsContainer) String() string {
var buf bytes.Buffer
// Get the keys in sorted order
keys := make([]string, 0, len(s))
for key := range s {
keys = append(keys, key)
}
sort.Strings(keys)
// Iterate over each top-level key
for _, key := range keys {
buf.WriteString(fmt.Sprintf(key + ":\n"))
// Sort the sub-keys
subvals := s[key]
subkeys := make([]string, 0, len(subvals))
for k := range subvals {
subkeys = append(subkeys, k)
}
sort.Strings(subkeys)
// Iterate over the subkeys
for _, subkey := range subkeys {
val := subvals[subkey]
buf.WriteString(fmt.Sprintf("\t%s = %s\n", subkey, val))
}
}
return buf.String()
}
|
