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service.go
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service.go
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// Copyright (c) 2022 Gobalsky Labs Limited
//
// Use of this software is governed by the Business Source License included
// in the LICENSE.DATANODE file and at https://www.mariadb.com/bsl11.
//
// Change Date: 18 months from the later of the date of the first publicly
// available Distribution of this version of the repository, and 25 June 2022.
//
// On the date above, in accordance with the Business Source License, use
// of this software will be governed by version 3 or later of the GNU General
// Public License.
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)
}