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forwarder.go
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forwarder.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 distributor
import (
"context"
"sync"
"time"
tp "github.com/intergral/deep/pkg/deeppb/tracepoint/v1"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/grafana/dskit/services"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"go.uber.org/multierr"
"github.com/intergral/deep/modules/distributor/queue"
"github.com/intergral/deep/modules/overrides"
)
const (
defaultWorkerCount = 2
defaultQueueSize = 100
)
var (
metricForwarderPushes = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: "deep",
Subsystem: "distributor",
Name: "forwarder_pushes_total",
Help: "Total number of successful requests queued up for a tenant to the generatorForwarder. This metric is now deprecated in favor of deep_distributor_queue_pushes_total.",
}, []string{"tenant"})
metricForwarderPushesFailures = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: "deep",
Subsystem: "distributor",
Name: "forwarder_pushes_failures_total",
Help: "Total number of failed pushes to the queue for a tenant to the generatorForwarder. This metric is now deprecated in favor of deep_distributor_queue_pushes_failures_total.",
}, []string{"tenant"})
)
type forwardFunc func(ctx context.Context, tenantID string, keys []uint32, snapshot *tp.Snapshot) error
type request struct {
tenantID string
keys []uint32
snapshot *tp.Snapshot
}
// generatorForwarder queues up snapshots to be sent to the metrics-generators
type generatorForwarder struct {
services.Service
logger log.Logger
// per-tenant queues
queues map[string]*queue.Queue[*request]
mutex sync.RWMutex
forwardFunc forwardFunc
o *overrides.Overrides
overridesInterval time.Duration
shutdown chan interface{}
}
func newGeneratorForwarder(logger log.Logger, fn forwardFunc, o *overrides.Overrides) *generatorForwarder {
rf := &generatorForwarder{
logger: logger,
queues: make(map[string]*queue.Queue[*request]),
mutex: sync.RWMutex{},
forwardFunc: fn,
o: o,
overridesInterval: time.Minute,
shutdown: make(chan interface{}),
}
rf.Service = services.NewIdleService(rf.start, rf.stop)
return rf
}
// getQueueConfig returns queueSize and workerCount for the given tenant
func (f *generatorForwarder) getQueueConfig(tenantID string) (queueSize, workerCount int) {
queueSize = f.o.MetricsGeneratorForwarderQueueSize(tenantID)
if queueSize == 0 {
queueSize = defaultQueueSize
}
workerCount = f.o.MetricsGeneratorForwarderWorkers(tenantID)
if workerCount == 0 {
workerCount = defaultWorkerCount
}
return queueSize, workerCount
}
func (f *generatorForwarder) getOrCreateQueue(tenantID string) *queue.Queue[*request] {
q, ok := f.getQueue(tenantID)
if ok {
return q
}
f.mutex.Lock()
defer f.mutex.Unlock()
queueSize, workerCount := f.getQueueConfig(tenantID)
f.queues[tenantID] = f.createQueueAndStartWorkers(tenantID, queueSize, workerCount)
return f.queues[tenantID]
}
func (f *generatorForwarder) getQueue(tenantID string) (*queue.Queue[*request], bool) {
f.mutex.RLock()
defer f.mutex.RUnlock()
q, ok := f.queues[tenantID]
return q, ok
}
// watchOverrides watches the overrides for changes
// and updates the queues accordingly
func (f *generatorForwarder) watchOverrides() {
ticker := time.NewTicker(f.overridesInterval)
for {
select {
case <-ticker.C:
f.mutex.Lock()
var (
queuesToDelete []*queue.Queue[*request]
queuesToAdd []struct {
tenantID string
queueSize, workerCount int
}
)
for tenantID, q := range f.queues {
queueSize, workerCount := f.getQueueConfig(tenantID)
// if the queue size or worker count has changed, shutdown the queue manager and create a new one
if q.ShouldUpdate(queueSize, workerCount) {
_ = level.Info(f.logger).Log(
"msg", "Marking queue manager for update",
"tenant", tenantID,
"old_queue_size", q.Size(),
"new_queue_size", queueSize,
"old_worker_count", q.WorkerCount(),
"new_worker_count", workerCount,
)
queuesToDelete = append(queuesToDelete, q)
queuesToAdd = append(queuesToAdd, struct {
tenantID string
queueSize, workerCount int
}{tenantID: tenantID, queueSize: queueSize, workerCount: workerCount})
}
}
// Spawn a goroutine to asynchronously shut down queue managers
go func() {
for _, q := range queuesToDelete {
// shutdown the queue manager
// this will block until all workers have finished and the queue is drained
_ = level.Info(f.logger).Log("msg", "Shutting down queue manager", "tenant", q.TenantID())
if err := q.Shutdown(context.Background()); err != nil {
_ = level.Error(f.logger).Log("msg", "error shutting down queue manager", "tenant", q.TenantID(), "err", err)
}
}
}()
// Synchronously update queue managers
for _, q := range queuesToAdd {
_ = level.Info(f.logger).Log("msg", "Updating queue manager", "tenant", q.tenantID)
f.queues[q.tenantID] = f.createQueueAndStartWorkers(q.tenantID, q.queueSize, q.workerCount)
}
f.mutex.Unlock()
case <-f.shutdown:
ticker.Stop()
return
}
}
}
func (f *generatorForwarder) start(_ context.Context) error {
go f.watchOverrides()
return nil
}
func (f *generatorForwarder) stop(_ error) error {
close(f.shutdown)
ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
defer cancel()
var errs []error
for _, q := range f.queues {
if err := q.Shutdown(ctx); err != nil {
errs = append(errs, err)
}
}
return multierr.Combine(errs...)
}
func (f *generatorForwarder) processFunc(ctx context.Context, data *request) {
if err := f.forwardFunc(ctx, data.tenantID, data.keys, data.snapshot); err != nil {
_ = level.Warn(f.logger).Log("msg", "failed to forward request to metrics generator", "err", err)
}
}
func (f *generatorForwarder) createQueueAndStartWorkers(tenantID string, size, workerCount int) *queue.Queue[*request] {
q := queue.New(
queue.Config{
Name: "metrics-generator",
TenantID: tenantID,
Size: size,
WorkerCount: workerCount,
},
f.logger,
f.processFunc,
)
q.StartWorkers()
return q
}
// SendSnapshot queues up snapshots to be sent to the metrics-generators
func (f *generatorForwarder) SendSnapshot(ctx context.Context, tenantID string, keys []uint32, snapshot *tp.Snapshot) {
select {
case <-f.shutdown:
return
default:
}
q := f.getOrCreateQueue(tenantID)
err := q.Push(ctx, &request{tenantID: tenantID, keys: keys, snapshot: snapshot})
if err != nil {
_ = level.Error(f.logger).Log("msg", "failed to push snapshot to queue", "tenant", tenantID, "err", err)
metricForwarderPushesFailures.WithLabelValues(tenantID).Inc()
}
metricForwarderPushes.WithLabelValues(tenantID).Inc()
}