forked from projectcalico/calico
/
daemon.go
578 lines (526 loc) · 21.3 KB
/
daemon.go
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// Copyright (c) 2017-2018,2020-2021 Tigera, Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package daemon
import (
"context"
"fmt"
"net/http"
"os"
"os/signal"
"runtime"
"runtime/debug"
"runtime/pprof"
"strings"
"syscall"
"time"
"github.com/docopt/docopt-go"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/collectors"
"github.com/prometheus/client_golang/prometheus/promhttp"
log "github.com/sirupsen/logrus"
"github.com/dtest11/calico/libcalico-go/lib/seedrng"
"github.com/dtest11/calico/libcalico-go/lib/apiconfig"
bapi "github.com/dtest11/calico/libcalico-go/lib/backend/api"
"github.com/dtest11/calico/libcalico-go/lib/backend/syncersv1/bgpsyncer"
"github.com/dtest11/calico/libcalico-go/lib/backend/syncersv1/felixsyncer"
"github.com/dtest11/calico/libcalico-go/lib/backend/syncersv1/nodestatussyncer"
"github.com/dtest11/calico/libcalico-go/lib/backend/syncersv1/tunnelipsyncer"
"github.com/dtest11/calico/libcalico-go/lib/clientv3"
"github.com/dtest11/calico/libcalico-go/lib/health"
"github.com/dtest11/calico/libcalico-go/lib/upgrade/migrator"
"github.com/dtest11/calico/libcalico-go/lib/upgrade/migrator/clients"
"github.com/dtest11/calico/typha/pkg/buildinfo"
"github.com/dtest11/calico/typha/pkg/calc"
"github.com/dtest11/calico/typha/pkg/config"
"github.com/dtest11/calico/typha/pkg/jitter"
"github.com/dtest11/calico/typha/pkg/k8s"
"github.com/dtest11/calico/typha/pkg/logutils"
"github.com/dtest11/calico/typha/pkg/snapcache"
"github.com/dtest11/calico/typha/pkg/syncproto"
"github.com/dtest11/calico/typha/pkg/syncserver"
)
const usage = `Typha, Calico's fan-out proxy.
Usage:
calico-typha [options]
Options:
-c --config-file=<filename> Config file to load [default: /etc/calico/typha.cfg].
--version Print the version and exit.
`
// TyphaDaemon handles the lifecycle of the Typha process. The main() function of the Typha executable
// should simply call InitializeAndServeForever() to start the Typha server. The lifecycle is broken out into
// several individual methods for ease of testing.
type TyphaDaemon struct {
BuildInfoLogCxt *log.Entry
ConfigFilePath string
DatastoreClient DatastoreClient
ConfigParams *config.Config
// The components of the server, created in CreateServer() below.
SyncerPipelines []*syncerPipeline
CachesBySyncerType map[syncproto.SyncerType]syncserver.BreadcrumbProvider
Server *syncserver.Server
// The functions below default to real library functions but they can be overridden for testing.
NewClientV3 func(config apiconfig.CalicoAPIConfig) (DatastoreClient, error)
ConfigureEarlyLogging func()
ConfigureLogging func(configParams *config.Config)
// Health monitoring.
healthAggregator *health.HealthAggregator
// Node counting.
nodeCounter *calc.NodeCounter
}
type syncerPipeline struct {
Type syncproto.SyncerType
Syncer bapi.Syncer
SyncerToValidator *calc.SyncerCallbacksDecoupler
Validator *calc.ValidationFilter
ValidatorToCache *calc.SyncerCallbacksDecoupler
Cache *snapcache.Cache
}
func (p syncerPipeline) Start(cxt context.Context) {
logCxt := log.WithField("syncerType", p.Type)
logCxt.Info("Starting syncer")
p.Syncer.Start()
logCxt.Info("Starting syncer-to-validator decoupler")
go p.SyncerToValidator.SendTo(p.Validator)
logCxt.Info("Starting validator-to-cache decoupler")
go p.ValidatorToCache.SendTo(p.Cache)
logCxt.Info("Starting cache")
p.Cache.Start(cxt)
logCxt.Info("Started syncer pipeline")
}
func New() *TyphaDaemon {
return &TyphaDaemon{
NewClientV3: func(config apiconfig.CalicoAPIConfig) (DatastoreClient, error) {
client, err := clientv3.New(config)
if err != nil {
return nil, err
}
return ClientV3Shim{client.(RealClientV3), config}, nil
},
ConfigureEarlyLogging: logutils.ConfigureEarlyLogging,
ConfigureLogging: logutils.ConfigureLogging,
CachesBySyncerType: map[syncproto.SyncerType]syncserver.BreadcrumbProvider{},
}
}
func (t *TyphaDaemon) InitializeAndServeForever(cxt context.Context) error {
t.DoEarlyRuntimeSetup()
t.ParseCommandLineArgs(nil)
err := t.LoadConfiguration(cxt)
if err != nil { // Should only happen if context is canceled.
return err
}
t.CreateServer()
t.Start(cxt)
t.WaitAndShutDown(cxt)
return nil
}
// DoEarlyRuntimeSetup does early runtime/logging configuration that needs to happen before we do any work.
func (t *TyphaDaemon) DoEarlyRuntimeSetup() {
// Go's RNG is not seeded by default. Do that now.
seedrng.EnsureSeeded()
// Special-case handling for environment variable-configured logging:
// Initialise early so we can trace out config parsing.
t.ConfigureEarlyLogging()
}
// ParseCommandLineArgs parses the command line args and either exits with a usage warning or stores the parsed
// arguments on fields of the struct.
func (t *TyphaDaemon) ParseCommandLineArgs(argv []string) {
// Parse command-line args.
version := "Version: " + buildinfo.GitVersion + "\n" +
"Full git commit ID: " + buildinfo.GitRevision + "\n" +
"Build date: " + buildinfo.BuildDate + "\n"
p := &docopt.Parser{OptionsFirst: false, SkipHelpFlags: false}
arguments, err := p.ParseArgs(usage, argv, version)
if err != nil {
println(usage)
log.Fatalf("Failed to parse usage, exiting: %v", err)
}
t.ConfigFilePath = arguments["--config-file"].(string)
t.BuildInfoLogCxt = log.WithFields(log.Fields{
"version": buildinfo.GitVersion,
"buildDate": buildinfo.BuildDate,
"gitCommit": buildinfo.GitRevision,
"GOMAXPROCS": runtime.GOMAXPROCS(0),
})
t.BuildInfoLogCxt.Info("Typha starting up")
log.Infof("Command line arguments: %v", arguments)
}
// LoadConfiguration uses the command-line configuration and environment variables to load our configuration.
// It initializes the datastore connection.
func (t *TyphaDaemon) LoadConfiguration(ctx context.Context) error {
// Log out the kubernetes server details that we use in BPF mode.
log.WithFields(log.Fields{
"KUBERNETES_SERVICE_HOST": os.Getenv("KUBERNETES_SERVICE_HOST"),
"KUBERNETES_SERVICE_PORT": os.Getenv("KUBERNETES_SERVICE_PORT"),
}).Info("Kubernetes server override env vars.")
// Load the configuration from all the different sources including the
// datastore and merge. Keep retrying on failure. We'll sit in this
// loop until the datastore is ready.
log.Infof("Loading configuration...")
var configParams *config.Config
var datastoreConfig apiconfig.CalicoAPIConfig
configRetry:
for {
if err := ctx.Err(); err != nil {
log.WithError(err).Warn("Context canceled.")
return err
}
// Load locally-defined config, including the datastore connection
// parameters. First the environment variables.
configParams = config.New()
envConfig := config.LoadConfigFromEnvironment(os.Environ())
// Then, the config file.
fileConfig, err := config.LoadConfigFile(t.ConfigFilePath)
if err != nil {
log.WithError(err).WithField("configFile", t.ConfigFilePath).Error(
"Failed to load configuration file")
time.Sleep(1 * time.Second)
continue configRetry
}
// Parse and merge the local config.
_, err = configParams.UpdateFrom(envConfig, config.EnvironmentVariable)
if err != nil {
log.WithError(err).WithField("configFile", t.ConfigFilePath).Error(
"Failed to parse configuration environment variable")
time.Sleep(1 * time.Second)
continue configRetry
}
_, err = configParams.UpdateFrom(fileConfig, config.ConfigFile)
if err != nil {
log.WithError(err).WithField("configFile", t.ConfigFilePath).Error(
"Failed to parse configuration file")
time.Sleep(1 * time.Second)
continue configRetry
}
// Validate the config params
err = configParams.Validate()
if err != nil {
log.WithError(err).Error(
"Failed to parse/validate configuration.")
time.Sleep(1 * time.Second)
continue configRetry
}
// We should now have enough config to connect to the datastore.
datastoreConfig = configParams.DatastoreConfig()
t.DatastoreClient, err = t.NewClientV3(datastoreConfig)
if err != nil {
log.WithError(err).Error("Failed to connect to datastore")
time.Sleep(1 * time.Second)
continue configRetry
}
break configRetry
}
// If we get here, we've loaded the configuration successfully.
// Update log levels before we do anything else.
t.ConfigureLogging(configParams)
// Since we may have enabled more logging, log with the build context
// again.
t.BuildInfoLogCxt.WithField("config", configParams).Info(
"Successfully loaded configuration.")
if datastoreConfig.Spec.DatastoreType == apiconfig.Kubernetes {
// Special case: for KDD v1 datamodel to v3 datamodel upgrade, we need to ensure that the datastore migration
// has completed before we start serving requests. Otherwise, we might serve partially-migrated data to
// Felix.
// Get a v1 client, so we can check if there's any data there to migrate.
log.Info("Using Kubernetes API datastore, checking if we need to migrate v1 -> v3")
var civ1 clients.V1ClientInterface
var err error
for {
if err := ctx.Err(); err != nil {
log.WithError(err).Warn("Context canceled.")
return err
}
civ1, err = clients.LoadKDDClientV1FromAPIConfigV3(&datastoreConfig)
if err != nil {
log.WithError(err).Error("Failed to connect to Kubernetes datastore (Calico v1 API)")
time.Sleep(1 * time.Second)
continue
}
break
}
// Use the migration helper to determine if need to perform a migration, and if so
// perform the migration.
mh := migrator.New(t.DatastoreClient, civ1, nil)
for {
if err := ctx.Err(); err != nil {
log.WithError(err).Warn("Context canceled.")
return err
}
if migrate, err := mh.ShouldMigrate(); err != nil {
log.WithError(err).Error("Failed to determine migration requirements")
time.Sleep(1 * time.Second)
continue
} else if migrate {
log.Info("Need to migrate Kubernetes v1 configuration to v3")
if _, err := mh.Migrate(); err != nil {
log.WithError(err).Error("Failed to migrate Kubernetes v1 configuration to v3")
time.Sleep(1 * time.Second)
continue
}
log.Info("Successfully migrated Kubernetes v1 configuration to v3")
break
}
log.Info("Migration not required.")
break
}
}
// Ensure that, as soon as we are able to connect to the datastore at all, it is initialized.
// Note: we block further start-up while we do this, which means, if we're stuck here for long enough,
// the liveness healthcheck will time out and start to fail. That's fairly reasonable, being stuck here
// likely means we have some persistent datastore connection issue and restarting Typha may solve that.
for {
if err := ctx.Err(); err != nil {
log.WithError(err).Warn("Context canceled.")
return err
}
var err error
func() { // Closure to avoid leaking the defer.
log.Info("Initializing the datastore (if needed).")
ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
defer cancel()
err = t.DatastoreClient.EnsureInitialized(ctx, "", "typha")
}()
if err != nil {
log.WithError(err).Error("Failed to initialize datastore")
time.Sleep(1 * time.Second)
continue
}
log.Info("Datastore initialized.")
break
}
t.ConfigParams = configParams
return nil
}
func (t *TyphaDaemon) addSyncerPipeline(
syncerType syncproto.SyncerType,
newSyncer func(callbacks bapi.SyncerCallbacks) bapi.Syncer,
) {
// Get a Syncer from the datastore, which will feed the validator layer with updates.
syncerToValidator := calc.NewSyncerCallbacksDecoupler()
syncer := newSyncer(syncerToValidator)
log.Debugf("Created Syncer: %#v", syncer)
toCache := calc.NewSyncerCallbacksDecoupler()
var validator *calc.ValidationFilter
if syncerType == syncproto.SyncerTypeFelix {
// If this is a felix syncer, insert a counter after the validation filter which is used to track
// the number of nodes in the cluster. We only want to count nodes once, which is why we only do this
// for the felix syncer and not the BGP syncer as well.
t.nodeCounter = calc.NewNodeCounter(toCache)
validator = calc.NewValidationFilter(t.nodeCounter)
} else {
// Otherwise, just go from validator to cache directly.
validator = calc.NewValidationFilter(toCache)
}
// Create our snapshot cache, which stores point-in-time copies of the datastore contents.
cache := snapcache.New(snapcache.Config{
MaxBatchSize: t.ConfigParams.SnapshotCacheMaxBatchSize,
HealthAggregator: t.healthAggregator,
Name: string(syncerType),
})
pipeline := &syncerPipeline{
Type: syncerType,
Syncer: syncer,
SyncerToValidator: syncerToValidator,
Validator: validator,
ValidatorToCache: toCache,
Cache: cache,
}
t.SyncerPipelines = append(t.SyncerPipelines, pipeline)
t.CachesBySyncerType[syncerType] = cache
}
// CreateServer creates and configures (but does not start) the server components.
func (t *TyphaDaemon) CreateServer() {
// Health monitoring, for liveness and readiness endpoints.
t.healthAggregator = health.NewHealthAggregator()
// Now create the Syncer and caching layer (one pipeline for each syncer we support).
t.addSyncerPipeline(syncproto.SyncerTypeFelix, t.DatastoreClient.FelixSyncerByIface)
t.addSyncerPipeline(syncproto.SyncerTypeBGP, t.DatastoreClient.BGPSyncerByIface)
t.addSyncerPipeline(syncproto.SyncerTypeTunnelIPAllocation, t.DatastoreClient.TunnelIPAllocationSyncerByIface)
t.addSyncerPipeline(syncproto.SyncerTypeNodeStatus, t.DatastoreClient.NodeStatusSyncerByIface)
// Create the server, which listens for connections from Felix.
t.Server = syncserver.New(
t.CachesBySyncerType,
syncserver.Config{
MaxMessageSize: t.ConfigParams.ServerMaxMessageSize,
MinBatchingAgeThreshold: t.ConfigParams.ServerMinBatchingAgeThresholdSecs,
MaxFallBehind: t.ConfigParams.ServerMaxFallBehindSecs,
NewClientFallBehindGracePeriod: t.ConfigParams.ServerNewClientFallBehindGracePeriod,
PingInterval: t.ConfigParams.ServerPingIntervalSecs,
PongTimeout: t.ConfigParams.ServerPongTimeoutSecs,
DropInterval: t.ConfigParams.ConnectionDropIntervalSecs,
ShutdownTimeout: t.ConfigParams.ShutdownTimeoutSecs,
ShutdownMaxDropInterval: t.ConfigParams.ShutdownConnectionDropIntervalMaxSecs,
MaxConns: t.ConfigParams.MaxConnectionsUpperLimit,
Port: t.ConfigParams.ServerPort,
HealthAggregator: t.healthAggregator,
KeyFile: t.ConfigParams.ServerKeyFile,
CertFile: t.ConfigParams.ServerCertFile,
CAFile: t.ConfigParams.CAFile,
ClientCN: t.ConfigParams.ClientCN,
ClientURISAN: t.ConfigParams.ClientURISAN,
},
)
}
// Start starts all the server components in background goroutines.
func (t *TyphaDaemon) Start(cxt context.Context) {
// Now we've connected everything up, start the background processing threads.
log.Info("Starting the datastore Syncer/cache layer")
for _, s := range t.SyncerPipelines {
s.Start(cxt)
}
t.Server.Start(cxt)
if t.ConfigParams.ConnectionRebalancingMode == "kubernetes" {
log.Info("Kubernetes connection rebalancing is enabled, starting k8s poll goroutine.")
k8sAPI := k8s.NewK8sAPI(t.nodeCounter)
ticker := jitter.NewTicker(
t.ConfigParams.K8sServicePollIntervalSecs,
t.ConfigParams.K8sServicePollIntervalSecs/10)
go k8s.PollK8sForConnectionLimit(cxt, t.ConfigParams, ticker.C, k8sAPI, t.Server, len(t.CachesBySyncerType))
}
log.Info("Started the datastore Syncer/cache layer/server.")
if t.ConfigParams.PrometheusMetricsEnabled {
log.Info("Prometheus metrics enabled. Starting server.")
go servePrometheusMetrics(t.ConfigParams)
}
if t.ConfigParams.HealthEnabled {
log.WithFields(log.Fields{
"host": t.ConfigParams.HealthHost,
"port": t.ConfigParams.HealthPort,
}).Info("Health enabled. Starting server.")
t.healthAggregator.ServeHTTP(t.ConfigParams.HealthEnabled, t.ConfigParams.HealthHost, t.ConfigParams.HealthPort)
}
}
// WaitAndShutDown waits for OS signals or context.Done() and exits as appropriate.
func (t *TyphaDaemon) WaitAndShutDown(cxt context.Context) {
// Hook and process the signals we care about
usr1SignalChan := make(chan os.Signal, 1)
signal.Notify(usr1SignalChan, syscall.SIGUSR1)
termChan := make(chan os.Signal, 1)
signal.Notify(termChan, syscall.SIGTERM)
serverFinished := make(chan struct{})
go func() {
defer close(serverFinished)
t.Server.Finished.Wait()
}()
for {
select {
case <-termChan:
log.Warn("Received SIGTERM, shutting down")
t.Server.ShutDownGracefully()
case <-usr1SignalChan:
log.Info("Received SIGUSR1, emitting heap profile")
dumpHeapMemoryProfile(t.ConfigParams)
case <-cxt.Done():
log.Info("Context asked us to stop.")
return
case <-serverFinished:
log.Fatal("Server has shut down.")
}
}
}
// ClientV3Shim wraps a real client, allowing its syncer to be mocked.
type ClientV3Shim struct {
RealClientV3
config apiconfig.CalicoAPIConfig
}
func (s ClientV3Shim) FelixSyncerByIface(callbacks bapi.SyncerCallbacks) bapi.Syncer {
return felixsyncer.New(s.Backend(), s.config.Spec, callbacks, true)
}
func (s ClientV3Shim) BGPSyncerByIface(callbacks bapi.SyncerCallbacks) bapi.Syncer {
return bgpsyncer.New(s.Backend(), callbacks, "", s.config.Spec)
}
func (s ClientV3Shim) TunnelIPAllocationSyncerByIface(callbacks bapi.SyncerCallbacks) bapi.Syncer {
return tunnelipsyncer.New(s.Backend(), callbacks, "")
}
func (s ClientV3Shim) NodeStatusSyncerByIface(callbacks bapi.SyncerCallbacks) bapi.Syncer {
return nodestatussyncer.New(s.Backend(), callbacks)
}
// DatastoreClient is our interface to the datastore, used for mocking in the UTs.
type DatastoreClient interface {
clientv3.Interface
FelixSyncerByIface(callbacks bapi.SyncerCallbacks) bapi.Syncer
BGPSyncerByIface(callbacks bapi.SyncerCallbacks) bapi.Syncer
TunnelIPAllocationSyncerByIface(callbacks bapi.SyncerCallbacks) bapi.Syncer
NodeStatusSyncerByIface(callbacks bapi.SyncerCallbacks) bapi.Syncer
}
// RealClientV3 is the real API of the V3 client, including the semi-private API that we use to get the backend.
type RealClientV3 interface {
clientv3.Interface
Backend() bapi.Client
}
// TODO Typha: Share with Felix.
func dumpHeapMemoryProfile(configParams *config.Config) {
// If a memory profile file name is configured, dump a heap memory profile. If the
// configured filename includes "<timestamp>", that will be replaced with a stamp indicating
// the current time.
memProfFileName := configParams.DebugMemoryProfilePath
if memProfFileName != "" {
logCxt := log.WithField("file", memProfFileName)
logCxt.Info("Asked to create a memory profile.")
// If the configured file name includes "<timestamp>", replace that with the current
// time.
if strings.Contains(memProfFileName, "<timestamp>") {
timestamp := time.Now().Format("2006-01-02-15:04:05")
memProfFileName = strings.Replace(memProfFileName, "<timestamp>", timestamp, 1)
logCxt = log.WithField("file", memProfFileName)
}
// Open a file with that name.
memProfFile, err := os.Create(memProfFileName)
if err != nil {
logCxt.WithError(err).Fatal("Could not create memory profile file")
memProfFile = nil
} else {
defer func() {
err := memProfFile.Close()
if err != nil {
log.WithError(err).Error("Error while closing memory profile file.")
}
}()
logCxt.Info("Writing memory profile...")
// The initial resync uses a lot of scratch space so now is
// a good time to force a GC and return any RAM that we can.
debug.FreeOSMemory()
if err := pprof.WriteHeapProfile(memProfFile); err != nil {
logCxt.WithError(err).Error("Could not write memory profile")
}
logCxt.Info("Finished writing memory profile")
}
}
}
// TODO Typha: Share with Felix.
func servePrometheusMetrics(configParams *config.Config) {
for {
log.WithFields(log.Fields{
"host": configParams.PrometheusMetricsHost,
"port": configParams.PrometheusMetricsPort,
}).Info("Starting prometheus metrics endpoint")
if configParams.PrometheusGoMetricsEnabled && configParams.PrometheusProcessMetricsEnabled {
log.Info("Including Golang & Process metrics")
} else {
if !configParams.PrometheusGoMetricsEnabled {
log.Info("Discarding Golang metrics")
prometheus.Unregister(collectors.NewGoCollector())
}
if !configParams.PrometheusProcessMetricsEnabled {
log.Info("Discarding process metrics")
prometheus.Unregister(collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}))
}
}
http.Handle("/metrics", promhttp.Handler())
err := http.ListenAndServe(fmt.Sprintf("[%v]:%v",
configParams.PrometheusMetricsHost, configParams.PrometheusMetricsPort), nil)
log.WithError(err).Error(
"Prometheus metrics endpoint failed, trying to restart it...")
time.Sleep(1 * time.Second)
}
}