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loadDeviceMetadataByServiceIDs.go
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/
loadDeviceMetadataByServiceIDs.go
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package cqldb
import (
"context"
"errors"
"fmt"
"strconv"
"strings"
"github.com/gocql/gocql"
"github.com/plgd-dev/hub/v2/pkg/cqldb"
pkgStrings "github.com/plgd-dev/hub/v2/pkg/strings"
"github.com/plgd-dev/hub/v2/resource-aggregate/cqrs/eventstore"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
func (s *EventStore) LoadDeviceMetadataByServiceIDs(ctx context.Context, serviceIDs []string, limit int64) ([]eventstore.DeviceDocumentMetadata, error) {
if len(serviceIDs) == 0 {
return nil, status.Errorf(codes.InvalidArgument, "invalid serviceIDs")
}
serviceIDs = pkgStrings.Unique(serviceIDs)
q := cqldb.SelectCommand + " " + deviceIDKey + "," + serviceIDKey + " " + cqldb.FromClause + " " + s.Table() + " " + cqldb.WhereClause + " " + serviceIDKey + " in (" + strings.Join(serviceIDs, ",") + ") LIMIT " + strconv.FormatInt(limit, 10) + ";"
iter := s.Session().Query(q).WithContext(ctx).Iter()
if iter == nil {
return nil, errors.New("cannot create iterator")
}
ret := make([]eventstore.DeviceDocumentMetadata, 0, iter.NumRows())
values := make(map[string]interface{}, 2)
for iter.MapScan(values) {
deviceID, ok := values[deviceIDKey].(gocql.UUID)
if !ok {
_ = iter.Close()
return nil, fmt.Errorf(errFmtDataIsNotUUIDType, deviceIDKey, values[deviceIDKey])
}
serviceID, ok := values[serviceIDKey].(gocql.UUID)
if !ok {
_ = iter.Close()
return nil, fmt.Errorf(errFmtDataIsNotUUIDType, serviceIDKey, values[serviceIDKey])
}
ret = append(ret, eventstore.DeviceDocumentMetadata{
DeviceID: deviceID.String(),
ServiceID: serviceID.String(),
})
delete(values, deviceIDKey)
delete(values, serviceIDKey)
}
err := iter.Close()
if err == nil {
return ret, nil
}
if errors.Is(err, gocql.ErrNotFound) {
return nil, nil
}
return nil, err
}