168 lines
3.5 KiB
Go
168 lines
3.5 KiB
Go
package command
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import (
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"fmt"
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"io"
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"os"
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"os/signal"
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"strconv"
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"strings"
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"syscall"
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"time"
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"github.com/hashicorp/nomad/api"
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"github.com/mitchellh/cli"
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)
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type MonitorCommand struct {
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Meta
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}
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func (c *MonitorCommand) Help() string {
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helpText := `
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Usage: nomad monitor [options]
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Stream log messages of a nomad agent. The monitor command lets you
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listen for log levels that may be filtered out of the Nomad agent. For
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example your agent may only be logging at INFO level, but with the monitor
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command you can set -log-level DEBUG
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General Options:
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` + generalOptionsUsage() + `
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Monitor Specific Options:
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-log-level <level>
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Sets the log level to monitor (default: INFO)
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-node-id <node-id>
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Sets the specific node to monitor
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-server-id <server-id>
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Sets the specific server to monitor
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-json
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Sets log output to JSON format
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`
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return strings.TrimSpace(helpText)
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}
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func (c *MonitorCommand) Synopsis() string {
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return "Stream logs from a Nomad agent"
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}
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func (c *MonitorCommand) Name() string { return "monitor" }
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func (c *MonitorCommand) Run(args []string) int {
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c.Ui = &cli.PrefixedUi{
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OutputPrefix: " ",
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InfoPrefix: " ",
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ErrorPrefix: "==> ",
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Ui: c.Ui,
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}
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var logLevel string
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var nodeID string
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var serverID string
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var logJSON bool
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flags := c.Meta.FlagSet(c.Name(), FlagSetClient)
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flags.Usage = func() { c.Ui.Output(c.Help()) }
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flags.StringVar(&logLevel, "log-level", "", "")
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flags.StringVar(&nodeID, "node-id", "", "")
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flags.StringVar(&serverID, "server-id", "", "")
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flags.BoolVar(&logJSON, "json", false, "")
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if err := flags.Parse(args); err != nil {
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return 1
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}
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args = flags.Args()
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if l := len(args); l != 0 {
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c.Ui.Error("This command takes no arguments")
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c.Ui.Error(commandErrorText(c))
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return 1
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}
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client, err := c.Meta.Client()
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error initializing client: %s", err))
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c.Ui.Error(commandErrorText(c))
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return 1
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}
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// Query the node info and lookup prefix
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if len(nodeID) == 1 {
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c.Ui.Error(fmt.Sprintf("Node identifier must contain at least two characters."))
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return 1
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}
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if nodeID != "" {
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nodeID = sanitizeUUIDPrefix(nodeID)
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nodes, _, err := client.Nodes().PrefixList(nodeID)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error querying node: %v", err))
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return 1
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}
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if len(nodes) == 0 {
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c.Ui.Error(fmt.Sprintf("No node(s) with prefix or id %q found", nodeID))
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return 1
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}
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if len(nodes) > 1 {
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out := formatNodeStubList(nodes, false)
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c.Ui.Output(fmt.Sprintf("Prefix matched multiple nodes\n\n%s", out))
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return 1
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}
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nodeID = nodes[0].ID
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}
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params := map[string]string{
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"log_level": logLevel,
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"node_id": nodeID,
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"server_id": serverID,
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"log_json": strconv.FormatBool(logJSON),
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}
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query := &api.QueryOptions{
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Params: params,
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}
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eventDoneCh := make(chan struct{})
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frames, errCh := client.Agent().Monitor(eventDoneCh, query)
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select {
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case err := <-errCh:
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c.Ui.Error(fmt.Sprintf("Error starting monitor: %s", err))
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c.Ui.Error(commandErrorText(c))
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return 1
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default:
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}
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// Create a reader
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var r io.ReadCloser
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frameReader := api.NewFrameReader(frames, errCh, eventDoneCh)
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frameReader.SetUnblockTime(500 * time.Millisecond)
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r = frameReader
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defer r.Close()
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signalCh := make(chan os.Signal, 1)
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signal.Notify(signalCh, os.Interrupt, syscall.SIGTERM)
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go func() {
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<-signalCh
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// End the streaming
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r.Close()
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}()
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_, err = io.Copy(os.Stdout, r)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("error monitoring logs: %s", err))
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return 1
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}
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return 0
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}
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