499 lines
14 KiB
Go
499 lines
14 KiB
Go
package command
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import (
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"encoding/json"
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"fmt"
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"io"
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"log"
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"os"
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"os/signal"
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"path/filepath"
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"regexp"
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"strings"
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"syscall"
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"time"
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"github.com/armon/go-metrics"
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"github.com/armon/go-metrics/circonus"
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"github.com/armon/go-metrics/datadog"
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"github.com/hashicorp/consul/agent"
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"github.com/hashicorp/consul/agent/config"
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"github.com/hashicorp/consul/lib"
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"github.com/hashicorp/consul/logger"
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"github.com/hashicorp/go-checkpoint"
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multierror "github.com/hashicorp/go-multierror"
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"github.com/hashicorp/logutils"
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"github.com/mitchellh/cli"
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)
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// validDatacenter is used to validate a datacenter
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var validDatacenter = regexp.MustCompile("^[a-zA-Z0-9_-]+$")
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// AgentCommand is a Command implementation that runs a Consul agent.
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// The command will not end unless a shutdown message is sent on the
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// ShutdownCh. If two messages are sent on the ShutdownCh it will forcibly
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// exit.
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type AgentCommand struct {
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BaseCommand
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Revision string
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Version string
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VersionPrerelease string
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HumanVersion string
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ShutdownCh <-chan struct{}
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args []string
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logFilter *logutils.LevelFilter
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logOutput io.Writer
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logger *log.Logger
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}
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// readConfig is responsible for setup of our configuration using
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// the command line and any file configs
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func (cmd *AgentCommand) readConfig() *config.RuntimeConfig {
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var flags config.Flags
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fs := cmd.BaseCommand.NewFlagSet(cmd)
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config.AddFlags(fs, &flags)
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if err := cmd.BaseCommand.Parse(cmd.args); err != nil {
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cmd.UI.Error(fmt.Sprintf("error parsing flags: %v", err))
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return nil
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}
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b, err := config.NewBuilder(flags)
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if err != nil {
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cmd.UI.Error(err.Error())
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return nil
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}
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cfg, err := b.BuildAndValidate()
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if err != nil {
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cmd.UI.Error(err.Error())
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return nil
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}
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for _, w := range b.Warnings {
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cmd.UI.Warn(w)
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}
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return &cfg
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}
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// checkpointResults is used to handler periodic results from our update checker
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func (cmd *AgentCommand) checkpointResults(results *checkpoint.CheckResponse, err error) {
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if err != nil {
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cmd.UI.Error(fmt.Sprintf("Failed to check for updates: %v", err))
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return
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}
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if results.Outdated {
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cmd.UI.Error(fmt.Sprintf("Newer Consul version available: %s (currently running: %s)", results.CurrentVersion, cmd.Version))
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}
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for _, alert := range results.Alerts {
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switch alert.Level {
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case "info":
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cmd.UI.Info(fmt.Sprintf("Bulletin [%s]: %s (%s)", alert.Level, alert.Message, alert.URL))
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default:
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cmd.UI.Error(fmt.Sprintf("Bulletin [%s]: %s (%s)", alert.Level, alert.Message, alert.URL))
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}
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}
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}
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func (cmd *AgentCommand) startupUpdateCheck(config *config.RuntimeConfig) {
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version := config.Version
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if config.VersionPrerelease != "" {
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version += fmt.Sprintf("-%s", config.VersionPrerelease)
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}
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updateParams := &checkpoint.CheckParams{
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Product: "consul",
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Version: version,
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}
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if !config.DisableAnonymousSignature {
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updateParams.SignatureFile = filepath.Join(config.DataDir, "checkpoint-signature")
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}
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// Schedule a periodic check with expected interval of 24 hours
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checkpoint.CheckInterval(updateParams, 24*time.Hour, cmd.checkpointResults)
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// Do an immediate check within the next 30 seconds
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go func() {
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time.Sleep(lib.RandomStagger(30 * time.Second))
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cmd.checkpointResults(checkpoint.Check(updateParams))
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}()
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}
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// startupJoin is invoked to handle any joins specified to take place at start time
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func (cmd *AgentCommand) startupJoin(agent *agent.Agent, cfg *config.RuntimeConfig) error {
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if len(cfg.StartJoinAddrsLAN) == 0 {
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return nil
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}
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cmd.UI.Output("Joining cluster...")
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n, err := agent.JoinLAN(cfg.StartJoinAddrsLAN)
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if err != nil {
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return err
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}
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cmd.UI.Info(fmt.Sprintf("Join completed. Synced with %d initial agents", n))
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return nil
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}
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// startupJoinWan is invoked to handle any joins -wan specified to take place at start time
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func (cmd *AgentCommand) startupJoinWan(agent *agent.Agent, cfg *config.RuntimeConfig) error {
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if len(cfg.StartJoinAddrsWAN) == 0 {
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return nil
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}
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cmd.UI.Output("Joining -wan cluster...")
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n, err := agent.JoinWAN(cfg.StartJoinAddrsWAN)
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if err != nil {
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return err
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}
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cmd.UI.Info(fmt.Sprintf("Join -wan completed. Synced with %d initial agents", n))
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return nil
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}
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func statsiteSink(config *config.RuntimeConfig, hostname string) (metrics.MetricSink, error) {
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if config.TelemetryStatsiteAddr == "" {
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return nil, nil
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}
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return metrics.NewStatsiteSink(config.TelemetryStatsiteAddr)
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}
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func statsdSink(config *config.RuntimeConfig, hostname string) (metrics.MetricSink, error) {
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if config.TelemetryStatsdAddr == "" {
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return nil, nil
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}
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return metrics.NewStatsdSink(config.TelemetryStatsdAddr)
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}
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func dogstatdSink(config *config.RuntimeConfig, hostname string) (metrics.MetricSink, error) {
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if config.TelemetryDogstatsdAddr == "" {
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return nil, nil
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}
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sink, err := datadog.NewDogStatsdSink(config.TelemetryDogstatsdAddr, hostname)
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if err != nil {
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return nil, err
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}
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sink.SetTags(config.TelemetryDogstatsdTags)
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return sink, nil
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}
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func circonusSink(config *config.RuntimeConfig, hostname string) (metrics.MetricSink, error) {
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if config.TelemetryCirconusAPIToken == "" && config.TelemetryCirconusSubmissionURL == "" {
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return nil, nil
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}
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cfg := &circonus.Config{}
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cfg.Interval = config.TelemetryCirconusSubmissionInterval
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cfg.CheckManager.API.TokenKey = config.TelemetryCirconusAPIToken
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cfg.CheckManager.API.TokenApp = config.TelemetryCirconusAPIApp
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cfg.CheckManager.API.URL = config.TelemetryCirconusAPIURL
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cfg.CheckManager.Check.SubmissionURL = config.TelemetryCirconusSubmissionURL
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cfg.CheckManager.Check.ID = config.TelemetryCirconusCheckID
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cfg.CheckManager.Check.ForceMetricActivation = config.TelemetryCirconusCheckForceMetricActivation
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cfg.CheckManager.Check.InstanceID = config.TelemetryCirconusCheckInstanceID
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cfg.CheckManager.Check.SearchTag = config.TelemetryCirconusCheckSearchTag
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cfg.CheckManager.Check.DisplayName = config.TelemetryCirconusCheckDisplayName
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cfg.CheckManager.Check.Tags = config.TelemetryCirconusCheckTags
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cfg.CheckManager.Broker.ID = config.TelemetryCirconusBrokerID
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cfg.CheckManager.Broker.SelectTag = config.TelemetryCirconusBrokerSelectTag
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if cfg.CheckManager.Check.DisplayName == "" {
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cfg.CheckManager.Check.DisplayName = "Consul"
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}
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if cfg.CheckManager.API.TokenApp == "" {
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cfg.CheckManager.API.TokenApp = "consul"
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}
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if cfg.CheckManager.Check.SearchTag == "" {
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cfg.CheckManager.Check.SearchTag = "service:consul"
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}
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sink, err := circonus.NewCirconusSink(cfg)
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if err != nil {
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return nil, err
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}
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sink.Start()
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return sink, nil
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}
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func startupTelemetry(conf *config.RuntimeConfig) (*metrics.InmemSink, error) {
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// Setup telemetry
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// Aggregate on 10 second intervals for 1 minute. Expose the
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// metrics over stderr when there is a SIGUSR1 received.
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memSink := metrics.NewInmemSink(10*time.Second, time.Minute)
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metrics.DefaultInmemSignal(memSink)
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metricsConf := metrics.DefaultConfig(conf.TelemetryMetricsPrefix)
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metricsConf.EnableHostname = !conf.TelemetryDisableHostname
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metricsConf.FilterDefault = conf.TelemetryFilterDefault
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var sinks metrics.FanoutSink
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addSink := func(name string, fn func(*config.RuntimeConfig, string) (metrics.MetricSink, error)) error {
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s, err := fn(conf, metricsConf.HostName)
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if err != nil {
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return err
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}
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if s != nil {
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sinks = append(sinks, s)
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}
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return nil
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}
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if err := addSink("statsite", statsiteSink); err != nil {
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return nil, err
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}
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if err := addSink("statsd", statsdSink); err != nil {
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return nil, err
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}
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if err := addSink("dogstatd", dogstatdSink); err != nil {
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return nil, err
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}
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if err := addSink("circonus", circonusSink); err != nil {
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return nil, err
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}
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if len(sinks) > 0 {
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sinks = append(sinks, memSink)
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metrics.NewGlobal(metricsConf, sinks)
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} else {
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metricsConf.EnableHostname = false
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metrics.NewGlobal(metricsConf, memSink)
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}
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return memSink, nil
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}
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func (cmd *AgentCommand) Run(args []string) int {
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code := cmd.run(args)
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if cmd.logger != nil {
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cmd.logger.Println("[INFO] Exit code:", code)
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}
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return code
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}
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func (cmd *AgentCommand) run(args []string) int {
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cmd.UI = &cli.PrefixedUi{
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OutputPrefix: "==> ",
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InfoPrefix: " ",
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ErrorPrefix: "==> ",
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Ui: cmd.UI,
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}
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// Parse our configs
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cmd.args = args
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config := cmd.readConfig()
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if config == nil {
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return 1
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}
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// Setup the log outputs
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logConfig := &logger.Config{
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LogLevel: config.LogLevel,
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EnableSyslog: config.EnableSyslog,
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SyslogFacility: config.SyslogFacility,
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}
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logFilter, logGate, logWriter, logOutput, ok := logger.Setup(logConfig, cmd.UI)
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if !ok {
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return 1
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}
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cmd.logFilter = logFilter
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cmd.logOutput = logOutput
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cmd.logger = log.New(logOutput, "", log.LstdFlags)
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memSink, err := startupTelemetry(config)
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if err != nil {
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cmd.UI.Error(err.Error())
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return 1
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}
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// Create the agent
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cmd.UI.Output("Starting Consul agent...")
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agent, err := agent.New(config)
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if err != nil {
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cmd.UI.Error(fmt.Sprintf("Error creating agent: %s", err))
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return 1
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}
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agent.LogOutput = logOutput
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agent.LogWriter = logWriter
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agent.MemSink = memSink
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if err := agent.Start(); err != nil {
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cmd.UI.Error(fmt.Sprintf("Error starting agent: %s", err))
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return 1
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}
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// shutdown agent before endpoints
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defer agent.ShutdownEndpoints()
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defer agent.ShutdownAgent()
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if !config.DisableUpdateCheck {
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cmd.startupUpdateCheck(config)
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}
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if err := cmd.startupJoin(agent, config); err != nil {
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cmd.UI.Error(err.Error())
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return 1
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}
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if err := cmd.startupJoinWan(agent, config); err != nil {
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cmd.UI.Error(err.Error())
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return 1
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}
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// Let the agent know we've finished registration
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agent.StartSync()
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segment := config.SegmentName
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if config.ServerMode {
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segment = "<all>"
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}
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cmd.UI.Output("Consul agent running!")
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cmd.UI.Info(fmt.Sprintf(" Version: '%s'", cmd.HumanVersion))
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cmd.UI.Info(fmt.Sprintf(" Node ID: '%s'", config.NodeID))
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cmd.UI.Info(fmt.Sprintf(" Node name: '%s'", config.NodeName))
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cmd.UI.Info(fmt.Sprintf(" Datacenter: '%s' (Segment: '%s')", config.Datacenter, segment))
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cmd.UI.Info(fmt.Sprintf(" Server: %v (Bootstrap: %v)", config.ServerMode, config.Bootstrap))
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cmd.UI.Info(fmt.Sprintf(" Client Addr: %v (HTTP: %d, HTTPS: %d, DNS: %d)", config.ClientAddrs,
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config.HTTPPort, config.HTTPSPort, config.DNSPort))
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cmd.UI.Info(fmt.Sprintf(" Cluster Addr: %v (LAN: %d, WAN: %d)", config.AdvertiseAddrLAN,
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config.SerfPortLAN, config.SerfPortWAN))
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cmd.UI.Info(fmt.Sprintf(" Encrypt: Gossip: %v, TLS-Outgoing: %v, TLS-Incoming: %v",
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agent.GossipEncrypted(), config.VerifyOutgoing, config.VerifyIncoming))
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// Enable log streaming
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cmd.UI.Info("")
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cmd.UI.Output("Log data will now stream in as it occurs:\n")
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logGate.Flush()
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// wait for signal
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signalCh := make(chan os.Signal, 4)
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signal.Notify(signalCh, os.Interrupt, syscall.SIGTERM, syscall.SIGHUP)
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signal.Notify(signalCh, os.Interrupt, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGPIPE)
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for {
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var sig os.Signal
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var reloadErrCh chan error
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select {
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case s := <-signalCh:
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sig = s
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case ch := <-agent.ReloadCh():
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sig = syscall.SIGHUP
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reloadErrCh = ch
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case <-cmd.ShutdownCh:
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sig = os.Interrupt
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case err := <-agent.RetryJoinCh():
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cmd.logger.Println("[ERR] Retry join failed: ", err)
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return 1
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case <-agent.ShutdownCh():
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// agent is already down!
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return 0
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}
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switch sig {
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case syscall.SIGPIPE:
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continue
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case syscall.SIGHUP:
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cmd.logger.Println("[INFO] Caught signal: ", sig)
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conf, err := cmd.handleReload(agent, config)
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if conf != nil {
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config = conf
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}
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if err != nil {
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cmd.logger.Println("[ERR] Reload config failed: ", err)
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}
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// Send result back if reload was called via HTTP
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if reloadErrCh != nil {
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reloadErrCh <- err
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}
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default:
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cmd.logger.Println("[INFO] Caught signal: ", sig)
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graceful := (sig == os.Interrupt && !(config.SkipLeaveOnInt)) || (sig == syscall.SIGTERM && (config.LeaveOnTerm))
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if !graceful {
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cmd.logger.Println("[INFO] Graceful shutdown disabled. Exiting")
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return 1
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}
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cmd.logger.Println("[INFO] Gracefully shutting down agent...")
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gracefulCh := make(chan struct{})
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go func() {
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if err := agent.Leave(); err != nil {
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cmd.logger.Println("[ERR] Error on leave:", err)
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return
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}
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close(gracefulCh)
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}()
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gracefulTimeout := 15 * time.Second
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select {
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case <-signalCh:
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cmd.logger.Printf("[INFO] Caught second signal %v. Exiting\n", sig)
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return 1
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case <-time.After(gracefulTimeout):
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cmd.logger.Println("[INFO] Timeout on graceful leave. Exiting")
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return 1
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case <-gracefulCh:
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cmd.logger.Println("[INFO] Graceful exit completed")
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return 0
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}
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}
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}
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}
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// handleReload is invoked when we should reload our configs, e.g. SIGHUP
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func (cmd *AgentCommand) handleReload(agent *agent.Agent, cfg *config.RuntimeConfig) (*config.RuntimeConfig, error) {
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cmd.logger.Println("[INFO] Reloading configuration...")
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var errs error
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newCfg := cmd.readConfig()
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if newCfg == nil {
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errs = multierror.Append(errs, fmt.Errorf("Failed to reload configs"))
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return cfg, errs
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}
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// Change the log level
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minLevel := logutils.LogLevel(strings.ToUpper(newCfg.LogLevel))
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if logger.ValidateLevelFilter(minLevel, cmd.logFilter) {
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cmd.logFilter.SetMinLevel(minLevel)
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} else {
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errs = multierror.Append(fmt.Errorf(
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"Invalid log level: %s. Valid log levels are: %v",
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minLevel, cmd.logFilter.Levels))
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// Keep the current log level
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newCfg.LogLevel = cfg.LogLevel
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}
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if err := agent.ReloadConfig(newCfg); err != nil {
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errs = multierror.Append(fmt.Errorf(
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"Failed to reload configs: %v", err))
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}
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return cfg, errs
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}
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func (cmd *AgentCommand) Synopsis() string {
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return "Runs a Consul agent"
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}
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func (cmd *AgentCommand) Help() string {
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helpText := `
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Usage: consul agent [options]
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Starts the Consul agent and runs until an interrupt is received. The
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agent represents a single node in a cluster.
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` + cmd.BaseCommand.Help()
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return strings.TrimSpace(helpText)
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}
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func printJSON(name string, v interface{}) {
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fmt.Println(name)
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b, err := json.MarshalIndent(v, "", " ")
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if err != nil {
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fmt.Printf("%#v\n", v)
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return
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}
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fmt.Println(string(b))
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}
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