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sinkWrapper.go
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/
sinkWrapper.go
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// SPDX-FileCopyrightText: 2021 Comcast Cable Communications Management, LLC
// SPDX-License-Identifier: Apache-2.0
package sink
import (
"crypto/tls"
"errors"
"fmt"
"net/http"
"sync"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/xmidt-org/caduceus/internal/client"
"github.com/xmidt-org/caduceus/internal/metrics"
"github.com/xmidt-org/candlelight"
"github.com/xmidt-org/wrp-go/v3"
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
"go.uber.org/fx"
"go.uber.org/zap"
)
// WrapperIn configures the Wrapper for creation
type WrapperIn struct {
fx.In
Tracing candlelight.Tracing
Config Config
Metrics metrics.Metrics
EventType *prometheus.CounterVec `name:"incoming_event_type_count"`
Logger *zap.Logger
}
// SinkWrapper interface is needed for unit testing.
type Wrapper interface {
Update([]Listener)
Queue(*wrp.Message)
Shutdown(bool)
}
// Wrapper contains the configuration that will be shared with each outbound sender. It contains no external parameters.
type wrapper struct {
// The amount of time to let expired SinkSenders linger before
// shutting them down and cleaning up the resources associated with them.
linger time.Duration
// The logger implementation to share with sinkSenders.
logger *zap.Logger
//the configuration needed for eash sinkSender
config Config
mutex sync.RWMutex
senders map[string]Sender
eventType *prometheus.CounterVec
wg sync.WaitGroup
shutdown chan struct{}
metrics metrics.Metrics
client client.Client //TODO: keeping here for now - but might move to SinkSender in a later PR
clientMiddleware func(client.Client) client.Client //TODO: keeping here for now - but might move to SinkSender in a later PR
}
func Provide() fx.Option {
return fx.Provide(
func(in metrics.MetricsIn) metrics.Metrics {
senderMetrics := metrics.Metrics{
DeliveryCounter: in.DeliveryCounter,
DeliveryRetryCounter: in.DeliveryRetryCounter,
DeliveryRetryMaxGauge: in.DeliveryRetryMaxGauge,
CutOffCounter: in.CutOffCounter,
SlowConsumerDroppedMsgCounter: in.SlowConsumerDroppedMsgCounter,
DropsDueToPanic: in.DropsDueToPanic,
ConsumerDeliverUntilGauge: in.ConsumerDeliverUntilGauge,
ConsumerDropUntilGauge: in.ConsumerDropUntilGauge,
ConsumerDeliveryWorkersGauge: in.ConsumerDeliveryWorkersGauge,
ConsumerMaxDeliveryWorkersGauge: in.ConsumerMaxDeliveryWorkersGauge,
OutgoingQueueDepth: in.OutgoingQueueDepth,
ConsumerRenewalTimeGauge: in.ConsumerRenewalTimeGauge,
QueryLatency: in.QueryLatency,
}
return senderMetrics
},
func(in WrapperIn) (Wrapper, error) {
w, err := NewWrapper(in)
return w, err
},
)
}
func NewWrapper(in WrapperIn) (wr Wrapper, err error) {
w := &wrapper{
linger: in.Config.Linger,
logger: in.Logger,
eventType: in.EventType,
config: in.Config,
metrics: in.Metrics,
}
tr := newRoundTripper(in.Config, in.Tracing)
w.client = client.DoerFunc((&http.Client{
Transport: tr,
Timeout: in.Config.ClientTimeout,
}).Do)
if in.Config.Linger <= 0 {
linger := fmt.Sprintf("linger not positive: %v", in.Config.Linger)
err = errors.New(linger)
w = nil
return
}
w.senders = make(map[string]Sender)
w.shutdown = make(chan struct{})
w.wg.Add(1)
go undertaker(w)
wr = w
return
}
// no longer being initialized at start up - needs to be initialized by the creation of the outbound sender
func newRoundTripper(config Config, tracing candlelight.Tracing) (tr http.RoundTripper) {
tr = &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: config.DisableClientHostnameValidation},
MaxIdleConnsPerHost: config.NumWorkersPerSender,
ResponseHeaderTimeout: config.ResponseHeaderTimeout,
IdleConnTimeout: config.IdleConnTimeout,
}
tr = otelhttp.NewTransport(tr,
otelhttp.WithPropagators(tracing.Propagator()),
otelhttp.WithTracerProvider(tracing.TracerProvider()),
)
return
}
// Commenting out while until ancla/argus dependency issue is fixed.
// Update is called when we get changes to our webhook listeners with either
// additions, or updates. This code takes care of building new OutboundSenders
// and maintaining the existing OutboundSenders.
func (w *wrapper) Update(list []Listener) {
ids := make([]struct {
Listener Listener
ID string
}, len(list))
for i, v := range list {
ids[i].Listener = v
ids[i].ID = v.GetId()
}
w.mutex.Lock()
defer w.mutex.Unlock()
for _, inValue := range ids {
sender, ok := w.senders[inValue.ID]
if !ok {
var ss Sender
var err error
listener := inValue.Listener
metricWrapper, err := client.NewMetricWrapper(time.Now, w.metrics.QueryLatency, inValue.ID)
if err != nil {
continue
}
ss, err = NewSender(w, listener)
w.clientMiddleware = metricWrapper.RoundTripper
if err == nil {
w.senders[inValue.ID] = ss
}
continue
}
fmt.Println(sender)
// sender.Update(inValue.Listener) //commenting out until argus/ancla fix
}
}
// Queue is used to send all the possible outbound senders a request. This
// function performs the fan-out and filtering to multiple possible endpoints.
func (w *wrapper) Queue(msg *wrp.Message) {
w.mutex.RLock()
defer w.mutex.RUnlock()
w.eventType.With(prometheus.Labels{metrics.EventLabel: msg.FindEventStringSubMatch()}).Add(1)
for _, v := range w.senders {
v.Queue(msg)
}
}
// Shutdown closes down the delivery mechanisms and cleans up the underlying
// OutboundSenders either gently (waiting for delivery queues to empty) or not
// (dropping enqueued messages)
func (w *wrapper) Shutdown(gentle bool) {
w.mutex.Lock()
defer w.mutex.Unlock()
for k, v := range w.senders {
v.Shutdown(gentle)
delete(w.senders, k)
}
close(w.shutdown)
}
// undertaker looks at the OutboundSenders periodically and prunes the ones
// that have been retired for too long, freeing up resources.
func undertaker(w *wrapper) {
defer w.wg.Done()
// Collecting unused OutboundSenders isn't a huge priority, so do it
// slowly.
ticker := time.NewTicker(2 * w.linger)
for {
select {
case <-ticker.C:
threshold := time.Now().Add(-1 * w.linger)
// Actually shutting these down could take longer then we
// want to lock the mutex, so just remove them from the active
// list & shut them down afterwards.
deadList, err := createDeadlist(w, threshold)
if err != nil {
break
}
// Shut them down
for _, v := range deadList {
v.Shutdown(false)
}
case <-w.shutdown:
ticker.Stop()
return
}
}
}
func createDeadlist(w *wrapper, threshold time.Time) (map[string]Sender, error) {
if w == nil || threshold.IsZero() {
return nil, nil
}
deadList := make(map[string]Sender)
w.mutex.Lock()
defer w.mutex.Unlock()
for k, v := range w.senders {
retired, err := v.RetiredSince()
if err != nil {
return nil, fmt.Errorf("failed to get retirement time for sender %s: %w", k, err)
}
if threshold.After(retired) {
deadList[k] = v
delete(w.senders, k)
}
}
return deadList, nil
}