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service.go
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service.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 candlesv2
import (
"context"
"fmt"
"sync"
"time"
"code.vegaprotocol.io/vega/datanode/entities"
"code.vegaprotocol.io/vega/logging"
)
// CandleStore ...
//
//go:generate go run github.com/golang/mock/mockgen -destination mocks/candle_store_mock.go -package mocks code.vegaprotocol.io/vega/datanode/candlesv2 CandleStore
type CandleStore interface {
GetCandleDataForTimeSpan(ctx context.Context, candleID string, from *time.Time, to *time.Time,
p entities.CursorPagination) ([]entities.Candle, entities.PageInfo, error)
GetCandlesForMarket(ctx context.Context, market string) (map[string]string, error)
CandleExists(ctx context.Context, candleID string) (bool, error)
GetCandleIDForIntervalAndMarket(ctx context.Context, interval string, market string) (bool, string, error)
}
type Svc struct {
Config
CandleStore
ctx context.Context
log *logging.Logger
candleIDToUpdatesStream map[string]*CandleUpdates
subscriptionIDToCandleID map[string]string
updatesSubscriptionMutex sync.Mutex
}
func NewService(ctx context.Context, log *logging.Logger, config Config, candleStore CandleStore) *Svc {
log = log.Named(namedLogger)
log.SetLevel(config.Level.Get())
return &Svc{
ctx: ctx,
log: log,
Config: config,
CandleStore: candleStore,
candleIDToUpdatesStream: map[string]*CandleUpdates{},
subscriptionIDToCandleID: map[string]string{},
}
}
// Subscribe to a channel of new or updated candles. The subscriber id will must be retained for future reference and to Unsubscribe.
func (cs *Svc) Subscribe(ctx context.Context, candleID string) (string, <-chan entities.Candle, error) {
cs.updatesSubscriptionMutex.Lock()
defer cs.updatesSubscriptionMutex.Unlock()
exists, err := cs.CandleExists(ctx, candleID)
if err != nil {
return "", nil, fmt.Errorf("subscribing to candles:%w", err)
}
if !exists {
return "", nil, fmt.Errorf("no candle exists for candle id:%s", candleID)
}
if _, ok := cs.candleIDToUpdatesStream[candleID]; !ok {
updates := NewCandleUpdates(cs.ctx, cs.log, candleID, cs, cs.Config.CandleUpdates)
cs.candleIDToUpdatesStream[candleID] = updates
}
updatesStream := cs.candleIDToUpdatesStream[candleID]
subscriptionID, out, err := updatesStream.Subscribe()
if err != nil {
return "", nil, fmt.Errorf("failed to subscribe to candle %s: %w", candleID, err)
}
cs.subscriptionIDToCandleID[subscriptionID] = candleID
return subscriptionID, out, nil
}
func (cs *Svc) Unsubscribe(subscriptionID string) error {
cs.updatesSubscriptionMutex.Lock()
defer cs.updatesSubscriptionMutex.Unlock()
if candleID, ok := cs.subscriptionIDToCandleID[subscriptionID]; ok {
updatesStream := cs.candleIDToUpdatesStream[candleID]
err := updatesStream.Unsubscribe(subscriptionID)
if err != nil {
return fmt.Errorf("failed to unsubscribe from candle %s: %w", candleID, err)
}
return nil
}
return fmt.Errorf("no subscription found for id %s", subscriptionID)
}