310 lines
10 KiB
Go
310 lines
10 KiB
Go
package agent
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import (
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"fmt"
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"io"
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"net"
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"net/http"
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"sync"
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"time"
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"github.com/hashicorp/consul/agent/consul/fsm"
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"github.com/armon/go-metrics/prometheus"
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"github.com/hashicorp/consul/agent/consul/usagemetrics"
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"github.com/hashicorp/consul/agent/local"
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"github.com/hashicorp/go-hclog"
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"google.golang.org/grpc/grpclog"
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grpcresolver "google.golang.org/grpc/resolver"
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autoconf "github.com/hashicorp/consul/agent/auto-config"
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"github.com/hashicorp/consul/agent/cache"
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cachetype "github.com/hashicorp/consul/agent/cache-types"
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"github.com/hashicorp/consul/agent/config"
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"github.com/hashicorp/consul/agent/consul"
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"github.com/hashicorp/consul/agent/grpc"
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"github.com/hashicorp/consul/agent/grpc/resolver"
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"github.com/hashicorp/consul/agent/pool"
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"github.com/hashicorp/consul/agent/router"
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"github.com/hashicorp/consul/agent/token"
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"github.com/hashicorp/consul/ipaddr"
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"github.com/hashicorp/consul/lib"
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"github.com/hashicorp/consul/logging"
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"github.com/hashicorp/consul/proto/pbsubscribe"
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"github.com/hashicorp/consul/tlsutil"
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)
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// TODO: BaseDeps should be renamed in the future once more of Agent.Start
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// has been moved out in front of Agent.New, and we can better see the setup
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// dependencies.
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type BaseDeps struct {
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consul.Deps // TODO: un-embed
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RuntimeConfig *config.RuntimeConfig
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MetricsHandler MetricsHandler
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AutoConfig *autoconf.AutoConfig // TODO: use an interface
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Cache *cache.Cache
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}
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// MetricsHandler provides an http.Handler for displaying metrics.
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type MetricsHandler interface {
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DisplayMetrics(resp http.ResponseWriter, req *http.Request) (interface{}, error)
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}
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type ConfigLoader func(source config.Source) (config.LoadResult, error)
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func NewBaseDeps(configLoader ConfigLoader, logOut io.Writer) (BaseDeps, error) {
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d := BaseDeps{}
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result, err := configLoader(nil)
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if err != nil {
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return d, err
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}
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cfg := result.RuntimeConfig
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logConf := cfg.Logging
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logConf.Name = logging.Agent
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d.Logger, err = logging.Setup(logConf, logOut)
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if err != nil {
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return d, err
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}
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grpclog.SetLoggerV2(logging.NewGRPCLogger(cfg.Logging.LogLevel, d.Logger))
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for _, w := range result.Warnings {
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d.Logger.Warn(w)
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}
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cfg.NodeID, err = newNodeIDFromConfig(cfg, d.Logger)
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if err != nil {
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return d, fmt.Errorf("failed to setup node ID: %w", err)
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}
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gauges, counters, summaries := getPrometheusDefs(cfg.Telemetry)
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cfg.Telemetry.PrometheusOpts.GaugeDefinitions = gauges
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cfg.Telemetry.PrometheusOpts.CounterDefinitions = counters
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cfg.Telemetry.PrometheusOpts.SummaryDefinitions = summaries
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d.MetricsHandler, err = lib.InitTelemetry(cfg.Telemetry)
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if err != nil {
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return d, fmt.Errorf("failed to initialize telemetry: %w", err)
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}
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d.TLSConfigurator, err = tlsutil.NewConfigurator(cfg.ToTLSUtilConfig(), d.Logger)
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if err != nil {
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return d, err
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}
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d.RuntimeConfig = cfg
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d.Tokens = new(token.Store)
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cfg.Cache.Logger = d.Logger.Named("cache")
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// cache-types are not registered yet, but they won't be used until the components are started.
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d.Cache = cache.New(cfg.Cache)
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d.ConnPool = newConnPool(cfg, d.Logger, d.TLSConfigurator)
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builder := resolver.NewServerResolverBuilder(resolver.Config{})
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registerWithGRPC(builder)
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d.GRPCConnPool = grpc.NewClientConnPool(builder, grpc.TLSWrapper(d.TLSConfigurator.OutgoingRPCWrapper()), d.TLSConfigurator.UseTLS)
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d.Router = router.NewRouter(d.Logger, cfg.Datacenter, fmt.Sprintf("%s.%s", cfg.NodeName, cfg.Datacenter), builder)
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acConf := autoconf.Config{
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DirectRPC: d.ConnPool,
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Logger: d.Logger,
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Loader: configLoader,
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ServerProvider: d.Router,
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TLSConfigurator: d.TLSConfigurator,
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Cache: d.Cache,
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Tokens: d.Tokens,
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}
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d.AutoConfig, err = autoconf.New(acConf)
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if err != nil {
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return d, err
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}
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if err := registerCacheTypes(d); err != nil {
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return d, err
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}
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return d, nil
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}
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// registerCacheTypes on bd.Cache.
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//
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// Note: most cache types are still registered in Agent.registerCache. This
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// function is for registering newer cache-types which no longer have a dependency
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// on Agent.
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func registerCacheTypes(bd BaseDeps) error {
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if bd.RuntimeConfig.UseStreamingBackend {
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conn, err := bd.GRPCConnPool.ClientConn(bd.RuntimeConfig.Datacenter)
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if err != nil {
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return err
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}
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matDeps := cachetype.MaterializerDeps{
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Client: pbsubscribe.NewStateChangeSubscriptionClient(conn),
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Logger: bd.Logger,
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}
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bd.Cache.RegisterType(cachetype.StreamingHealthServicesName, cachetype.NewStreamingHealthServices(matDeps))
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}
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return nil
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}
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func newConnPool(config *config.RuntimeConfig, logger hclog.Logger, tls *tlsutil.Configurator) *pool.ConnPool {
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var rpcSrcAddr *net.TCPAddr
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if !ipaddr.IsAny(config.RPCBindAddr) {
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rpcSrcAddr = &net.TCPAddr{IP: config.RPCBindAddr.IP}
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}
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pool := &pool.ConnPool{
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Server: config.ServerMode,
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SrcAddr: rpcSrcAddr,
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Logger: logger.StandardLogger(&hclog.StandardLoggerOptions{InferLevels: true}),
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TLSConfigurator: tls,
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Datacenter: config.Datacenter,
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}
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if config.ServerMode {
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pool.MaxTime = 2 * time.Minute
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pool.MaxStreams = 64
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} else {
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// MaxTime controls how long we keep an idle connection open to a server.
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// 127s was chosen as the first prime above 120s
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// (arbitrarily chose to use a prime) with the intent of reusing
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// connections who are used by once-a-minute cron(8) jobs *and* who
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// use a 60s jitter window (e.g. in vixie cron job execution can
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// drift by up to 59s per job, or 119s for a once-a-minute cron job).
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pool.MaxTime = 127 * time.Second
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pool.MaxStreams = 32
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}
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return pool
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}
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var registerLock sync.Mutex
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// registerWithGRPC registers the grpc/resolver.Builder as a grpc/resolver.
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// This function exists to synchronize registrations with a lock.
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// grpc/resolver.Register expects all registration to happen at init and does
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// not allow for concurrent registration. This function exists to support
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// parallel testing.
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func registerWithGRPC(b grpcresolver.Builder) {
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registerLock.Lock()
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defer registerLock.Unlock()
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grpcresolver.Register(b)
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}
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// getPrometheusDefs reaches into every slice of prometheus defs we've defined in each part of the agent, and appends
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// all of our slices into one nice slice of definitions per metric type for the Consul agent to pass to go-metrics.
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func getPrometheusDefs(cfg lib.TelemetryConfig) ([]prometheus.GaugeDefinition, []prometheus.CounterDefinition, []prometheus.SummaryDefinition) {
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// Build slice of slices for all gauge definitions
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var gauges = [][]prometheus.GaugeDefinition{
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cache.Gauges,
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consul.AutopilotGauges,
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consul.RPCGauges,
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consul.SessionGauges,
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grpc.StatsGauges,
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usagemetrics.Gauges,
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Gauges,
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}
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// Flatten definitions
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// NOTE(kit): Do we actually want to create a set here so we can ensure definition names are unique?
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var gaugeDefs []prometheus.GaugeDefinition
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for _, g := range gauges {
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// Set Consul to each definition's namespace
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// TODO(kit): Prepending the service to each definition should be handled by go-metrics
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var withService []prometheus.GaugeDefinition
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for _, gauge := range g {
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gauge.Name = append([]string{cfg.MetricsPrefix}, gauge.Name...)
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withService = append(withService, gauge)
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}
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gaugeDefs = append(gaugeDefs, withService...)
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}
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raftCounters := []prometheus.CounterDefinition{
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// TODO(kit): "raft..." metrics come from the raft lib and we should migrate these to a telemetry
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// package within. In the mean time, we're going to define a few here because they're key to monitoring Consul.
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{
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Name: []string{"raft", "apply"},
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Help: "This counts the number of Raft transactions occurring over the interval.",
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},
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{
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Name: []string{"raft", "state", "candidate"},
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Help: "This increments whenever a Consul server starts an election.",
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},
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{
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Name: []string{"raft", "state", "leader"},
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Help: "This increments whenever a Consul server becomes a leader.",
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},
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}
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var counters = [][]prometheus.CounterDefinition{
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CatalogCounters,
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cache.Counters,
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consul.ACLCounters,
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consul.CatalogCounters,
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consul.ClientCounters,
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consul.RPCCounters,
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grpc.StatsCounters,
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local.StateCounters,
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raftCounters,
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}
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// Flatten definitions
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// NOTE(kit): Do we actually want to create a set here so we can ensure definition names are unique?
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var counterDefs []prometheus.CounterDefinition
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for _, c := range counters {
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// TODO(kit): Prepending the service to each definition should be handled by go-metrics
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var withService []prometheus.CounterDefinition
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for _, counter := range c {
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counter.Name = append([]string{cfg.MetricsPrefix}, counter.Name...)
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withService = append(withService, counter)
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}
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counterDefs = append(counterDefs, withService...)
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}
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raftSummaries := []prometheus.SummaryDefinition{
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// TODO(kit): "raft..." metrics come from the raft lib and we should migrate these to a telemetry
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// package within. In the mean time, we're going to define a few here because they're key to monitoring Consul.
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{
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Name: []string{"raft", "commitTime"},
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Help: "This measures the time it takes to commit a new entry to the Raft log on the leader.",
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},
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{
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Name: []string{"raft", "leader", "lastContact"},
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Help: "Measures the time since the leader was last able to contact the follower nodes when checking its leader lease.",
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},
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}
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var summaries = [][]prometheus.SummaryDefinition{
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HTTPSummaries,
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consul.ACLSummaries,
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consul.ACLEndpointSummaries,
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consul.ACLEndpointLegacySummaries,
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consul.CatalogSummaries,
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consul.FederationStateSummaries,
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consul.IntentionSummaries,
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consul.KVSummaries,
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consul.LeaderSummaries,
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consul.PreparedQuerySummaries,
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consul.RPCSummaries,
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consul.SegmentOSSSummaries,
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consul.SessionSummaries,
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consul.SessionEndpointSummaries,
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consul.TxnSummaries,
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fsm.CommandsSummaries,
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fsm.SnapshotSummaries,
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raftSummaries,
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}
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// Flatten definitions
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// NOTE(kit): Do we actually want to create a set here so we can ensure definition names are unique?
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var summaryDefs []prometheus.SummaryDefinition
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for _, s := range summaries {
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// TODO(kit): Prepending the service to each definition should be handled by go-metrics
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var withService []prometheus.SummaryDefinition
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for _, summary := range s {
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summary.Name = append([]string{cfg.MetricsPrefix}, summary.Name...)
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withService = append(withService, summary)
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}
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summaryDefs = append(summaryDefs, withService...)
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}
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return gaugeDefs, counterDefs, summaryDefs
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}
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