95 lines
1.9 KiB
Go
95 lines
1.9 KiB
Go
package command
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import (
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"fmt"
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"strings"
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"sync"
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)
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// MonitorCommand 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 MonitorCommand struct {
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BaseCommand
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ShutdownCh <-chan struct{}
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lock sync.Mutex
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quitting bool
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}
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func (c *MonitorCommand) Help() string {
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helpText := `
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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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` + c.BaseCommand.Help()
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return strings.TrimSpace(helpText)
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}
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func (c *MonitorCommand) Run(args []string) int {
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var logLevel string
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f := c.BaseCommand.NewFlagSet(c)
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f.StringVar(&logLevel, "log-level", "INFO", "Log level of the agent.")
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if err := c.BaseCommand.Parse(args); err != nil {
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return 1
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}
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client, err := c.BaseCommand.HTTPClient()
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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(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 *MonitorCommand) Synopsis() string {
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return "Stream logs from a Consul agent"
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}
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