open-consul/command/event/event.go

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package event
import (
"flag"
"fmt"
"regexp"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/consul/command/flags"
"github.com/mitchellh/cli"
)
func New(ui cli.Ui) *cmd {
c := &cmd{UI: ui}
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c.init()
return c
}
type cmd struct {
UI cli.Ui
flags *flag.FlagSet
http *flags.HTTPFlags
name string
node string
service string
tag string
help string
}
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func (c *cmd) init() {
c.flags = flag.NewFlagSet("", flag.ContinueOnError)
c.flags.StringVar(&c.name, "name", "",
"Name of the event.")
c.flags.StringVar(&c.node, "node", "",
"Regular expression to filter on node names.")
c.flags.StringVar(&c.service, "service", "",
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"Regular expression to filter on service instances.")
c.flags.StringVar(&c.tag, "tag", "",
"Regular expression to filter on service tags. Must be used with -service.")
c.http = &flags.HTTPFlags{}
flags.Merge(c.flags, c.http.ClientFlags())
c.help = flags.Usage(help, c.flags)
}
func (c *cmd) Run(args []string) int {
if err := c.flags.Parse(args); err != nil {
return 1
}
// Check for a name
if c.name == "" {
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c.UI.Error("Event name must be specified")
c.UI.Error("")
c.UI.Error(c.Help())
return 1
}
// Validate the filters
if c.node != "" {
if _, err := regexp.Compile(c.node); err != nil {
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c.UI.Error(fmt.Sprintf("Failed to compile node filter regexp: %v", err))
return 1
}
}
if c.service != "" {
if _, err := regexp.Compile(c.service); err != nil {
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c.UI.Error(fmt.Sprintf("Failed to compile service filter regexp: %v", err))
return 1
}
}
if c.tag != "" {
if _, err := regexp.Compile(c.tag); err != nil {
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c.UI.Error(fmt.Sprintf("Failed to compile tag filter regexp: %v", err))
return 1
}
}
if c.tag != "" && c.service == "" {
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c.UI.Error("Cannot provide tag filter without service filter.")
return 1
}
// Check for a payload
var payload []byte
args = c.flags.Args()
switch len(args) {
case 0:
case 1:
payload = []byte(args[0])
default:
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c.UI.Error("Too many command line arguments.")
c.UI.Error("")
c.UI.Error(c.Help())
return 1
}
// Create and test the HTTP client
client, err := c.http.APIClient()
if err != nil {
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c.UI.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
return 1
}
_, err = client.Agent().NodeName()
if err != nil {
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c.UI.Error(fmt.Sprintf("Error querying Consul agent: %s", err))
return 1
}
// Prepare the request
event := client.Event()
params := &api.UserEvent{
Name: c.name,
Payload: payload,
NodeFilter: c.node,
ServiceFilter: c.service,
TagFilter: c.tag,
}
// Fire the event
id, _, err := event.Fire(params, nil)
if err != nil {
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c.UI.Error(fmt.Sprintf("Error firing event: %s", err))
return 1
}
// Write out the ID
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c.UI.Output(fmt.Sprintf("Event ID: %s", id))
return 0
}
func (c *cmd) Synopsis() string {
return synopsis
}
func (c *cmd) Help() string {
return c.help
}
const synopsis = "Fire a new event"
const help = `
Usage: consul event [options] [payload]
Dispatches a custom user event across a datacenter. An event must provide
a name, but a payload is optional. Events support filtering using
regular expressions on node name, service, and tag definitions.
`