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observe.go
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observe.go
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// Copyright (C) 2023 Gobalsky Labs Limited
//
// 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 <http://www.gnu.org/licenses/>.
package api
import (
"context"
"time"
"code.vegaprotocol.io/vega/datanode/metrics"
"code.vegaprotocol.io/vega/logging"
)
func observe[T any](ctx context.Context, log *logging.Logger, eventType string, eventsInChan <-chan []T,
ref any, send func(T) error,
) error {
defer metrics.StartActiveSubscriptionCountGRPC(eventType)()
publishedEventStatTicker := time.NewTicker(time.Second)
defer publishedEventStatTicker.Stop()
var (
publishedEvents int64
err error
)
for {
select {
case <-publishedEventStatTicker.C:
metrics.PublishedEventsAdd(eventType, float64(publishedEvents))
publishedEvents = 0
case events, ok := <-eventsInChan:
if !ok {
err = ErrChannelClosed
log.Errorf("subscriber to %s, reference %v, error: %v", eventType, ref, err)
return formatE(ErrStreamInternal, err)
}
for _, event := range events {
if err = send(event); err != nil {
log.Errorf("rpc stream error, subscriber to %s, reference %v, error: %v", eventType, ref, err)
return formatE(ErrStreamInternal, err)
}
publishedEvents++
}
case <-ctx.Done():
err = ctx.Err()
if log.GetLevel() == logging.DebugLevel {
log.Debugf("rpc stream ctx error, subscriber to %s, reference %v, error: %v", eventType, ref, err)
}
return formatE(ErrStreamInternal, err)
}
if eventsInChan == nil {
if log.GetLevel() == logging.DebugLevel {
log.Debugf("rpc stream closed, subscriber to %s, reference %v, error: %v", eventType, ref, err)
}
return formatE(ErrStreamClosed)
}
}
}
func observeBatch[T any](ctx context.Context, log *logging.Logger, eventType string,
eventsInChan <-chan []T, ref any,
send func([]T) error,
) error {
defer metrics.StartActiveSubscriptionCountGRPC(eventType)()
publishedEventStatTicker := time.NewTicker(time.Second)
defer publishedEventStatTicker.Stop()
var (
publishedEvents int64
err error
)
for {
select {
case <-publishedEventStatTicker.C:
metrics.PublishedEventsAdd(eventType, float64(publishedEvents))
publishedEvents = 0
case events, ok := <-eventsInChan:
if !ok {
err = ErrChannelClosed
log.Errorf("subscriber to %s, reference %v, error: %v", eventType, ref, err)
return formatE(ErrStreamInternal, err)
}
err = send(events)
if err != nil {
log.Errorf("rpc stream error, subscriber to %s, reference %v, error: %v", eventType, ref, err)
return formatE(ErrStreamInternal, err)
}
publishedEvents = publishedEvents + int64(len(events))
case <-ctx.Done():
err = ctx.Err()
if log.GetLevel() == logging.DebugLevel {
log.Debugf("rpc stream ctx error, subscriber to %s, reference %v, error: %v", eventType, ref, err)
}
return formatE(ErrStreamInternal, err)
}
if eventsInChan == nil {
if log.GetLevel() == logging.DebugLevel {
log.Debugf("rpc stream closed, subscriber to %s, reference %v, error: %v", eventType, ref, err)
}
return formatE(ErrStreamClosed)
}
}
}