Example #1
0
// NewFloatCursorIterator returns a new instance of FloatCursorIterator.
func NewFloatCursorIterator(name string, tagMap map[string]string, cur Cursor, opt influxql.IteratorOptions) *FloatCursorIterator {
	// Extract variable reference if available.
	var ref *influxql.VarRef
	if opt.Expr != nil {
		ref = opt.Expr.(*influxql.VarRef)
	}

	// Only allocate aux values if we have any requested.
	var aux []interface{}
	if len(opt.Aux) > 0 {
		aux = make([]interface{}, len(opt.Aux))
	}

	// Convert to influxql tags.
	tags := influxql.NewTags(tagMap)

	// Determine initial seek position based on sort direction.
	seek := opt.StartTime
	if !opt.Ascending {
		seek = opt.EndTime
	}

	return &FloatCursorIterator{
		point: influxql.FloatPoint{
			Name: name,
			Tags: tags.Subset(opt.Dimensions),
			Aux:  aux,
		},
		opt:    opt,
		ref:    ref,
		tags:   tags,
		cursor: newBufCursor(cur, seek),
	}
}
Example #2
0
// ParseTags returns an instance of Tags for a comma-delimited list of key/values.
func ParseTags(s string) influxql.Tags {
	m := make(map[string]string)
	for _, kv := range strings.Split(s, ",") {
		a := strings.Split(kv, "=")
		m[a[0]] = a[1]
	}
	return influxql.NewTags(m)
}
Example #3
0
// Ensure that a subset can be created from a tag set.
func TestTags_Subset(t *testing.T) {
	tags := influxql.NewTags(map[string]string{"a": "0", "b": "1", "c": "2"})
	subset := tags.Subset([]string{"b", "c", "d"})
	if keys := subset.Keys(); !reflect.DeepEqual(keys, []string{"b", "c", "d"}) {
		t.Fatalf("unexpected keys: %+v", keys)
	} else if v := subset.Value("a"); v != "" {
		t.Fatalf("unexpected 'a' value: %s", v)
	} else if v := subset.Value("b"); v != "1" {
		t.Fatalf("unexpected 'b' value: %s", v)
	} else if v := subset.Value("c"); v != "2" {
		t.Fatalf("unexpected 'c' value: %s", v)
	} else if v := subset.Value("d"); v != "" {
		t.Fatalf("unexpected 'd' value: %s", v)
	}
}
Example #4
0
// createVarRefSeriesIterator creates an iterator for a variable reference for a series.
func (e *Engine) createVarRefSeriesIterator(ref *influxql.VarRef, mm *tsdb.Measurement, seriesKey string, t *influxql.TagSet, filter influxql.Expr, conditionFields []string, opt influxql.IteratorOptions) (influxql.Iterator, error) {
	tags := influxql.NewTags(e.index.TagsForSeries(seriesKey))

	// Create options specific for this series.
	itrOpt := opt
	itrOpt.Condition = filter

	// Build auxilary cursors.
	// Tag values should be returned if the field doesn't exist.
	var aux []cursorAt
	if len(opt.Aux) > 0 {
		aux = make([]cursorAt, len(opt.Aux))
		for i := range aux {
			// Create cursor from field.
			cur := e.buildCursor(mm.Name, seriesKey, opt.Aux[i], opt)
			if cur != nil {
				aux[i] = newBufCursor(cur, opt.Ascending)
				continue
			}

			// If field doesn't exist, use the tag value.
			// However, if the tag value is blank then return a null.
			if v := tags.Value(opt.Aux[i]); v == "" {
				aux[i] = &stringNilLiteralCursor{}
			} else {
				aux[i] = &stringLiteralCursor{value: v}
			}
		}
	}

	// Build conditional field cursors.
	// If a conditional field doesn't exist then ignore the series.
	var conds []*bufCursor
	if len(conditionFields) > 0 {
		conds = make([]*bufCursor, len(conditionFields))
		for i := range conds {
			cur := e.buildCursor(mm.Name, seriesKey, conditionFields[i], opt)
			if cur == nil {
				return nil, nil
			}
			conds[i] = newBufCursor(cur, opt.Ascending)
		}
	}

	// Limit tags to only the dimensions selected.
	tags = tags.Subset(opt.Dimensions)

	// If it's only auxiliary fields then it doesn't matter what type of iterator we use.
	if ref == nil {
		return newFloatIterator(mm.Name, tags, itrOpt, nil, aux, conds, conditionFields), nil
	}

	// Build main cursor.
	cur := e.buildCursor(mm.Name, seriesKey, ref.Val, opt)

	// If the field doesn't exist then don't build an iterator.
	if cur == nil {
		return nil, nil
	}

	switch cur := cur.(type) {
	case floatCursor:
		return newFloatIterator(mm.Name, tags, itrOpt, cur, aux, conds, conditionFields), nil
	case integerCursor:
		return newIntegerIterator(mm.Name, tags, itrOpt, cur, aux, conds, conditionFields), nil
	case stringCursor:
		return newStringIterator(mm.Name, tags, itrOpt, cur, aux, conds, conditionFields), nil
	case booleanCursor:
		return newBooleanIterator(mm.Name, tags, itrOpt, cur, aux, conds, conditionFields), nil
	default:
		panic("unreachable")
	}
}
Example #5
0
func (e *Engine) SeriesKeys(opt influxql.IteratorOptions) (influxql.SeriesList, error) {
	seriesList := influxql.SeriesList{}
	mms := tsdb.Measurements(e.index.MeasurementsByName(influxql.Sources(opt.Sources).Names()))
	for _, mm := range mms {
		// Determine tagsets for this measurement based on dimensions and filters.
		tagSets, err := mm.TagSets(opt.Dimensions, opt.Condition)
		if err != nil {
			return nil, err
		}

		// Calculate tag sets and apply SLIMIT/SOFFSET.
		tagSets = influxql.LimitTagSets(tagSets, opt.SLimit, opt.SOffset)
		for _, t := range tagSets {
			tagMap := make(map[string]string)
			for k, v := range t.Tags {
				if v == "" {
					continue
				}
				tagMap[k] = v
			}
			tags := influxql.NewTags(tagMap)

			series := influxql.Series{
				Name: mm.Name,
				Tags: tags,
				Aux:  make([]influxql.DataType, len(opt.Aux)),
			}

			// Determine the aux field types.
			for _, seriesKey := range t.SeriesKeys {
				tags := influxql.NewTags(e.index.TagsForSeries(seriesKey))
				for i, field := range opt.Aux {
					typ := func() influxql.DataType {
						mf := e.measurementFields[mm.Name]
						if mf == nil {
							return influxql.Unknown
						}

						f := mf.Field(field)
						if f == nil {
							return influxql.Unknown
						}
						return f.Type
					}()

					if typ == influxql.Unknown {
						if v := tags.Value(field); v != "" {
							// All tags are strings.
							typ = influxql.String
						}
					}

					if typ != influxql.Unknown {
						if series.Aux[i] == influxql.Unknown || typ < series.Aux[i] {
							series.Aux[i] = typ
						}
					}
				}
			}
			seriesList = append(seriesList, series)
		}
	}
	return seriesList, nil
}
Example #6
0
// Ensure that tags can return a unique id.
func TestTags_ID(t *testing.T) {
	tags := influxql.NewTags(map[string]string{"foo": "bar", "baz": "bat"})
	if id := tags.ID(); id != "baz\x00foo\x00bat\x00bar" {
		t.Fatalf("unexpected id: %q", id)
	}
}