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manager.go
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manager.go
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/*
* Copyright (C) 2023 Intergral GmbH
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package forwarder
import (
"context"
"fmt"
"sync"
"time"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/grafana/dskit/services"
"go.opentelemetry.io/collector/pdata/ptrace"
"go.uber.org/multierr"
"github.com/intergral/deep/modules/distributor/queue"
)
const (
defaultWorkerCount = 2
defaultQueueSize = 100
)
type Overrides interface {
TenantIDs() []string
Forwarders(tenantID string) []string
}
type Manager struct {
services.Service
logger log.Logger
overrides Overrides
// forwarderNameToForwarder is static throughout lifecycle of the manager and read-only
forwarderNameToForwarder map[string]Forwarder
tenantToQueueList map[string]*queueList
tenantToQueueListMu *sync.RWMutex
}
func NewManager(cfgs ConfigList, logger log.Logger, overrides Overrides) (*Manager, error) {
if err := cfgs.Validate(); err != nil {
return nil, fmt.Errorf("failed to validate config list: %w", err)
}
forwarderNameToForwarder := make(map[string]Forwarder, len(cfgs))
for i, cfg := range cfgs {
forwarder, err := New(cfg, logger)
if err != nil {
return nil, fmt.Errorf("failed to create forwarder for cfg at index=%d: %w", i, err)
}
forwarderNameToForwarder[cfg.Name] = forwarder
}
m := &Manager{
logger: logger,
overrides: overrides,
forwarderNameToForwarder: forwarderNameToForwarder,
tenantToQueueList: make(map[string]*queueList),
tenantToQueueListMu: &sync.RWMutex{},
}
m.Service = services.NewBasicService(m.start, m.run, m.stop)
return m, nil
}
func (m *Manager) ForTenant(tenantID string) List {
if len(m.forwarderNameToForwarder) < 1 || len(m.overrides.Forwarders(tenantID)) < 1 {
return nil
}
ql, ok := m.getOrCreateQueueList(tenantID)
if !ok {
return nil
}
return ql.list
}
func (m *Manager) getOrCreateQueueList(tenantID string) (*queueList, bool) {
ql, found := m.getQueueList(tenantID)
if found {
return ql, true
}
m.tenantToQueueListMu.Lock()
defer m.tenantToQueueListMu.Unlock()
forwarderNames := m.overrides.Forwarders(tenantID)
ql, err := newQueueList(m.logger, tenantID, forwarderNames, m.forwarderNameToForwarder)
if err != nil {
_ = level.Warn(m.logger).Log("msg", "failed to create queue list", "err", err)
return nil, false
}
m.tenantToQueueList[tenantID] = ql
return ql, true
}
func (m *Manager) getQueueList(tenantID string) (*queueList, bool) {
m.tenantToQueueListMu.RLock()
defer m.tenantToQueueListMu.RUnlock()
ql, found := m.tenantToQueueList[tenantID]
return ql, found
}
func (m *Manager) start(_ context.Context) error {
return nil
}
func (m *Manager) run(ctx context.Context) error {
ticker := time.NewTicker(10 * time.Second)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
if err := m.shutdown(); err != nil {
return fmt.Errorf("failed to shutdown: %w", err)
}
return nil
case <-ticker.C:
m.updateQueueLists()
}
}
}
func (m *Manager) stop(err error) error {
if err != nil {
_ = level.Warn(m.logger).Log("msg", "manager returned error from running state", "err", err)
}
return nil
}
func (m *Manager) updateQueueLists() {
m.tenantToQueueListMu.Lock()
defer m.tenantToQueueListMu.Unlock()
queueListsToAdd := make(map[string]*queueList)
for tenantID, ql := range m.tenantToQueueList {
forwarderNames := m.overrides.Forwarders(tenantID)
if len(forwarderNames) < 1 {
go m.shutdownQueueList(tenantID, ql)
delete(m.tenantToQueueList, tenantID)
continue
}
if ql.shouldUpdate(forwarderNames) {
go m.shutdownQueueList(tenantID, ql)
delete(m.tenantToQueueList, tenantID)
newQl, err := newQueueList(m.logger, tenantID, forwarderNames, m.forwarderNameToForwarder)
if err != nil {
_ = level.Warn(m.logger).Log("msg", "failed to create queue list", "err", err)
continue
}
queueListsToAdd[tenantID] = newQl
}
}
for tenantID, ql := range queueListsToAdd {
m.tenantToQueueList[tenantID] = ql
}
}
func (m *Manager) shutdown() error {
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
m.tenantToQueueListMu.Lock()
defer m.tenantToQueueListMu.Unlock()
var errs []error
for tenantID, ql := range m.tenantToQueueList {
if err := ql.shutdown(ctx); err != nil {
errs = append(errs, fmt.Errorf("failed to shutdown queuelist for tenantID=%s: %w", tenantID, err))
}
}
m.tenantToQueueList = make(map[string]*queueList)
for forwarderName, forwarder := range m.forwarderNameToForwarder {
if err := forwarder.Shutdown(ctx); err != nil {
errs = append(errs, fmt.Errorf("failed to shutdown forwarder with name=%s: %w", forwarderName, err))
}
}
m.forwarderNameToForwarder = make(map[string]Forwarder)
return multierr.Combine(errs...)
}
func (m *Manager) shutdownQueueList(tenantID string, ql *queueList) {
if err := ql.shutdown(context.Background()); err != nil {
_ = level.Warn(m.logger).Log("msg", "failed to shutdown queue list", "tenantID", tenantID)
}
}
type queueList struct {
logger log.Logger
tenantID string
forwarderNameToQueue map[string]*queue.Queue[ptrace.Traces]
list List
}
func newQueueList(logger log.Logger, tenantID string, forwarderNames []string, forwarderNameToForwarder map[string]Forwarder) (*queueList, error) {
forwarderNameToQueue := make(map[string]*queue.Queue[ptrace.Traces], len(forwarderNames))
list := make(List, 0, len(forwarderNames))
for _, forwarderName := range forwarderNames {
forwarder, found := forwarderNameToForwarder[forwarderName]
if !found {
return nil, fmt.Errorf("failed to find forwarder by name: forwarderName=%s, tenantID=%s", forwarderName, tenantID)
}
queueCfg := queue.Config{
Name: forwarderName,
TenantID: tenantID,
Size: defaultQueueSize,
WorkerCount: defaultWorkerCount,
}
processFunc := func(ctx context.Context, traces ptrace.Traces) {
if err := forwarder.ForwardTraces(ctx, traces); err != nil {
_ = level.Warn(logger).Log("msg", "failed to forward batches", "forwarderName", forwarderName, "tenantID", tenantID, "err", err)
}
}
newQueue := queue.New(queueCfg, logger, processFunc)
newQueue.StartWorkers()
forwarderNameToQueue[forwarderName] = newQueue
list = append(list, queueAdapter{queue: newQueue})
}
return &queueList{
logger: logger,
tenantID: tenantID,
forwarderNameToQueue: forwarderNameToQueue,
list: list,
}, nil
}
func (l *queueList) shouldUpdate(forwarderNames []string) bool {
if len(forwarderNames) != len(l.forwarderNameToQueue) {
return true
}
for _, forwarderName := range forwarderNames {
if _, found := l.forwarderNameToQueue[forwarderName]; !found {
return true
}
}
return false
}
func (l *queueList) shutdown(ctx context.Context) error {
var errs []error
for forwarderName, q := range l.forwarderNameToQueue {
if err := q.Shutdown(ctx); err != nil {
errs = append(errs, fmt.Errorf("failed to shutdown queue for forwarder=%s: %w", forwarderName, err))
}
delete(l.forwarderNameToQueue, forwarderName)
}
return multierr.Combine(errs...)
}
type queueAdapter struct {
queue *queue.Queue[ptrace.Traces]
}
func (a queueAdapter) ForwardTraces(ctx context.Context, traces ptrace.Traces) error {
return a.queue.Push(ctx, traces)
}
// Shutdown does nothing. Queue lifecycle is handled by queueList.
func (a queueAdapter) Shutdown(_ context.Context) error {
return nil
}