115 lines
2.3 KiB
Go
115 lines
2.3 KiB
Go
package monitor
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import (
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"flag"
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"fmt"
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"sync"
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"github.com/hashicorp/consul/command/flags"
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"github.com/mitchellh/cli"
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)
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// cmd is a Command implementation that queries a running
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// Consul agent what members are part of the cluster currently.
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type cmd struct {
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UI cli.Ui
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help string
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flags *flag.FlagSet
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http *flags.HTTPFlags
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shutdownCh <-chan struct{}
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lock sync.Mutex
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quitting bool
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// flags
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logLevel string
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}
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func New(ui cli.Ui, shutdownCh <-chan struct{}) *cmd {
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c := &cmd{UI: ui, shutdownCh: shutdownCh}
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c.init()
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return c
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}
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func (c *cmd) init() {
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c.flags = flag.NewFlagSet("", flag.ContinueOnError)
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c.flags.StringVar(&c.logLevel, "log-level", "INFO",
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"Log level of the agent.")
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c.http = &flags.HTTPFlags{}
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flags.Merge(c.flags, c.http.ClientFlags())
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c.help = flags.Usage(help, c.flags)
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}
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func (c *cmd) Run(args []string) int {
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if err := c.flags.Parse(args); err != nil {
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return 1
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}
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client, err := c.http.APIClient()
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
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return 1
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}
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eventDoneCh := make(chan struct{})
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logCh, err := client.Agent().Monitor(c.logLevel, eventDoneCh, nil)
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error starting monitor: %s", err))
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return 1
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}
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go func() {
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defer close(eventDoneCh)
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OUTER:
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for {
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select {
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case log := <-logCh:
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if log == "" {
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break OUTER
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}
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c.UI.Info(log)
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}
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}
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c.lock.Lock()
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defer c.lock.Unlock()
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if !c.quitting {
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c.UI.Info("")
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c.UI.Output("Remote side ended the monitor! This usually means that the\n" +
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"remote side has exited or crashed.")
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}
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}()
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select {
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case <-eventDoneCh:
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return 1
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case <-c.shutdownCh:
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c.lock.Lock()
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c.quitting = true
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c.lock.Unlock()
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}
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return 0
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}
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func (c *cmd) Synopsis() string {
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return synopsis
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}
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func (c *cmd) Help() string {
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return c.help
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}
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const synopsis = "Stream logs from a Consul agent"
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const help = `
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Usage: consul monitor [options]
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Shows recent log messages of a Consul agent, and attaches to the agent,
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outputting log messages as they occur in real time. The monitor lets you
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listen for log levels that may be filtered out of the Consul agent. For
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example your agent may only be logging at INFO level, but with the monitor
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you can see the DEBUG level logs.
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`
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