package command
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import (
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"flag"
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"fmt"
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"strings"
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"github.com/mitchellh/cli"
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)
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// EventCommand is a Command implementation that queries a running
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// Serf agent what members are part of the cluster currently.
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type EventCommand struct {
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Ui cli.Ui
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}
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var _ cli.Command = &EventCommand{}
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func (c *EventCommand) Help() string {
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helpText := `
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Usage: serf event [options] name payload
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Dispatches a custom event across the Serf cluster.
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Options:
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-coalesce=true/false Whether this event can be coalesced. This means
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that repeated events of the same name within a
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short period of time are ignored, except the last
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one received. Default is true.
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-rpc-addr=127.0.0.1:7373 RPC address of the Serf agent.
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-rpc-auth="" RPC auth token of the Serf agent.
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`
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return strings.TrimSpace(helpText)
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}
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func (c *EventCommand) Run(args []string) int {
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var coalesce bool
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cmdFlags := flag.NewFlagSet("event", flag.ContinueOnError)
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cmdFlags.Usage = func() { c.Ui.Output(c.Help()) }
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cmdFlags.BoolVar(&coalesce, "coalesce", true, "coalesce")
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rpcAddr := RPCAddrFlag(cmdFlags)
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rpcAuth := RPCAuthFlag(cmdFlags)
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if err := cmdFlags.Parse(args); err != nil {
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return 1
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}
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args = cmdFlags.Args()
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if len(args) < 1 {
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c.Ui.Error("An event name must be specified.")
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c.Ui.Error("")
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c.Ui.Error(c.Help())
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return 1
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} else if len(args) > 2 {
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c.Ui.Error("Too many command line arguments. Only a name and payload must be specified.")
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c.Ui.Error("")
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c.Ui.Error(c.Help())
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return 1
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}
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event := args[0]
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var payload []byte
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if len(args) == 2 {
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payload = []byte(args[1])
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}
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client, err := RPCClient(*rpcAddr, *rpcAuth)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error connecting to Serf agent: %s", err))
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return 1
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}
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defer client.Close()
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if err := client.UserEvent(event, payload, coalesce); err != nil {
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c.Ui.Error(fmt.Sprintf("Error sending event: %s", err))
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return 1
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}
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c.Ui.Output(fmt.Sprintf("Event '%s' dispatched! Coalescing enabled: %#v",
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event, coalesce))
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return 0
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}
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func (c *EventCommand) Synopsis() string {
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return "Send a custom event through the Serf cluster"
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}
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