package batch import ( "context" "time" "github.com/c9s/bbgo/pkg/types" ) var closedErrChan = make(chan error) func init() { close(closedErrChan) } type TradeBatchQuery struct { types.ExchangeTradeHistoryService } func (e TradeBatchQuery) Query(ctx context.Context, symbol string, options *types.TradeQueryOptions) (c chan types.Trade, errC chan error) { startTime := *options.StartTime endTime := *options.EndTime query := &AsyncTimeRangedBatchQuery{ Type: types.Trade{}, Q: func(startTime, endTime time.Time) (interface{}, error) { return e.ExchangeTradeHistoryService.QueryTrades(ctx, symbol, options) }, T: func(obj interface{}) time.Time { return time.Time(obj.(types.Trade).Time) }, ID: func(obj interface{}) string { trade := obj.(types.Trade) if trade.ID > options.LastTradeID { options.LastTradeID = trade.ID } return trade.Key().String() }, } c = make(chan types.Trade, 100) errC = query.Query(ctx, c, startTime, endTime) return c, errC }