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