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dynamic.go
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dynamic.go
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package cluster
import (
"context"
"fmt"
"strings"
"sync"
"time"
backendconfig "github.com/rudderlabs/rudder-server/config/backend-config"
"github.com/rudderlabs/rudder-server/services/stats"
"github.com/rudderlabs/rudder-server/utils/logger"
"github.com/rudderlabs/rudder-server/utils/types/servermode"
"github.com/rudderlabs/rudder-server/utils/types/workspace"
)
var (
controller = "ETCD"
controllerType = "Dynamic"
)
type ChangeEventProvider interface {
ServerMode(ctx context.Context) <-chan servermode.ChangeEvent
WorkspaceIDs(ctx context.Context) <-chan workspace.ChangeEvent
}
type lifecycle interface {
Start() error
Stop()
}
//go:generate mockgen -destination=./configlifecycle_mock_test.go -package=cluster_test -source=./dynamic.go configLifecycle
type configLifecycle interface {
Stop()
StartWithIDs(ctx context.Context, workspaces string)
WaitForConfig(ctx context.Context)
}
type Dynamic struct {
Provider ChangeEventProvider
GatewayComponent bool
GatewayDB lifecycle
RouterDB lifecycle
BatchRouterDB lifecycle
ErrorDB lifecycle
Processor lifecycle
Router lifecycle
MultiTenantStat lifecycle
currentMode servermode.Mode
currentWorkspaceIDs string
serverStartTimeStat stats.Measurement
serverStopTimeStat stats.Measurement
serverStartCountStat stats.Measurement
serverStopCountStat stats.Measurement
BackendConfig configLifecycle
logger logger.Logger
once sync.Once
}
func (d *Dynamic) init() {
d.currentMode = servermode.DegradedMode
d.logger = logger.NewLogger().Child("cluster")
tag := stats.Tags{
"controlled_by": controller,
"controller_type": controllerType,
}
d.serverStartTimeStat = stats.Default.NewTaggedStat("cluster.server_start_time", stats.TimerType, tag)
d.serverStopTimeStat = stats.Default.NewTaggedStat("cluster.server_stop_time", stats.TimerType, tag)
d.serverStartCountStat = stats.Default.NewTaggedStat("cluster.server_start_count", stats.CountType, tag)
d.serverStopCountStat = stats.Default.NewTaggedStat("cluster.server_stop_count", stats.CountType, tag)
if d.BackendConfig == nil {
d.BackendConfig = backendconfig.DefaultBackendConfig
}
}
func (d *Dynamic) Run(ctx context.Context) error {
d.once.Do(d.init)
ctx, cancel := context.WithCancel(ctx)
defer cancel()
serverModeChan := d.Provider.ServerMode(ctx)
workspaceIDsChan := d.Provider.WorkspaceIDs(ctx)
if d.GatewayComponent {
d.currentMode = servermode.NormalMode
}
for {
select {
case <-ctx.Done():
if d.currentMode == servermode.NormalMode {
d.stop()
}
return nil
case req := <-serverModeChan:
if req.Err() != nil {
return req.Err()
}
d.logger.Infof("Got trigger to change the mode, new mode: %s, old mode: %s", req.Mode(), d.currentMode)
if d.GatewayComponent {
d.logger.Infof("Gateway component, not changing the mode")
continue
}
err := d.handleModeChange(req.Mode())
if err != nil {
d.logger.Error(err)
return err
}
d.logger.Debugf("Acknowledging the mode change")
if err := req.Ack(ctx); err != nil {
return fmt.Errorf("ack mode change: %w", err)
}
case req := <-workspaceIDsChan:
if req.Err() != nil {
return req.Err()
}
ids := strings.Join(req.WorkspaceIDs(), ",")
d.logger.Infof("Got trigger to change workspaceIDs: %q", ids)
err := d.handleWorkspaceChange(ctx, ids)
if ackErr := req.Ack(ctx, err); ackErr != nil {
return fmt.Errorf("ack workspaceIDs change with error: %v: %w", err, ackErr)
}
if err != nil {
d.logger.Debugf("Could not handle workspaceIDs change: %v", err)
return err
}
d.logger.Debug("WorkspaceIDs changed")
}
}
}
func (d *Dynamic) start() error {
if d.GatewayComponent {
return nil
}
d.logger.Info("Starting the server")
start := time.Now()
if err := d.ErrorDB.Start(); err != nil {
return fmt.Errorf("error db start: %w", err)
}
if err := d.GatewayDB.Start(); err != nil {
return fmt.Errorf("gateway db start: %w", err)
}
if err := d.RouterDB.Start(); err != nil {
return fmt.Errorf("router db start: %w", err)
}
if err := d.BatchRouterDB.Start(); err != nil {
return fmt.Errorf("batch router db start: %w", err)
}
if err := d.MultiTenantStat.Start(); err != nil {
return fmt.Errorf("multi tenant stat start: %w", err)
}
if err := d.Processor.Start(); err != nil {
return fmt.Errorf("processor start: %w", err)
}
if err := d.Router.Start(); err != nil {
return fmt.Errorf("router start: %w", err)
}
d.serverStartTimeStat.SendTiming(time.Since(start))
d.serverStartCountStat.Increment()
return nil
}
func (d *Dynamic) stop() {
if d.GatewayComponent {
d.logger.Info("Stopping the gateway")
return
}
d.logger.Info("Stopping the server")
start := time.Now()
d.Processor.Stop()
d.logger.Debug("Processor stopped")
d.Router.Stop()
d.logger.Debug("Router stopped")
d.MultiTenantStat.Stop()
d.logger.Debug("MultiTenantStat stopped")
d.RouterDB.Stop()
d.logger.Debug("RouterDB stopped")
d.BatchRouterDB.Stop()
d.logger.Debug("BatchRouterDB stopped")
d.ErrorDB.Stop()
d.logger.Debug("ErrorDB stopped")
d.GatewayDB.Stop()
d.logger.Debug("GatewayDB stopped")
d.serverStopTimeStat.Since(start)
d.serverStopCountStat.Increment()
}
func (d *Dynamic) handleWorkspaceChange(ctx context.Context, workspaces string) error {
d.BackendConfig.Stop()
d.BackendConfig.StartWithIDs(ctx, workspaces)
d.currentWorkspaceIDs = workspaces
d.BackendConfig.WaitForConfig(ctx)
return nil
}
func (d *Dynamic) handleModeChange(newMode servermode.Mode) error {
if d.GatewayComponent {
d.logger.Info("Not transiting the server because this is only Gateway App")
return nil
}
if !newMode.Valid() {
return fmt.Errorf("unsupported mode: %s", newMode)
}
if d.currentMode == newMode {
d.logger.Info("New mode is same as old mode: %s, not switching the mode.", string(newMode))
return nil
}
switch d.currentMode {
case servermode.NormalMode:
switch newMode {
case servermode.DegradedMode:
d.logger.Info("Transiting the server from NormalMode to DegradedMode")
d.stop()
default:
d.logger.Errorf("Unsupported transition from NormalMode to %s", newMode)
return fmt.Errorf("unsupported transition from NormalMode to %s", newMode)
}
case servermode.DegradedMode:
switch newMode {
case servermode.NormalMode:
d.logger.Info("Transiting the server from DegradedMode to NormalMode")
if err := d.start(); err != nil {
d.logger.Errorf("Failed to start the server: %v", err)
return fmt.Errorf("failed to start the server: %w", err)
}
default:
d.logger.Errorf("Unsupported transition from DegradedMode to %s", newMode)
return fmt.Errorf("unsupported transition from DegradedMode to %s", newMode)
}
}
d.currentMode = newMode
return nil
}
func (d *Dynamic) Mode() servermode.Mode {
return d.currentMode
}