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entry_timeseries_double.go
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entry_timeseries_double.go
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package qdb
/*
#include <qdb/ts.h>
*/
import "C"
import (
"math"
"time"
"unsafe"
)
// TsDoublePoint : timestamped double data point
type TsDoublePoint struct {
timestamp time.Time
content float64
}
// Timestamp : return data point timestamp
func (t TsDoublePoint) Timestamp() time.Time {
return t.timestamp
}
// Content : return data point content
func (t TsDoublePoint) Content() float64 {
return t.content
}
// NewTsDoublePoint : Create new timeseries double point
func NewTsDoublePoint(timestamp time.Time, value float64) TsDoublePoint {
return TsDoublePoint{timestamp, value}
}
// :: internals
func (t TsDoublePoint) toStructC() C.qdb_ts_double_point {
return C.qdb_ts_double_point{toQdbTimespec(t.timestamp), C.double(t.content)}
}
func (t C.qdb_ts_double_point) toStructG() TsDoublePoint {
return TsDoublePoint{t.timestamp.toStructG(), float64(t.value)}
}
func doublePointArrayToC(pts ...TsDoublePoint) *C.qdb_ts_double_point {
if len(pts) == 0 {
return nil
}
points := make([]C.qdb_ts_double_point, len(pts))
for idx, pt := range pts {
points[idx] = pt.toStructC()
}
return &points[0]
}
func doublePointArrayToSlice(points *C.qdb_ts_double_point, length int) []C.qdb_ts_double_point {
// See https://github.com/mattn/go-sqlite3/issues/238 for details.
return (*[(math.MaxInt32 - 1) / unsafe.Sizeof(C.qdb_ts_double_point{})]C.qdb_ts_double_point)(unsafe.Pointer(points))[:length:length]
}
func doublePointArrayToGo(points *C.qdb_ts_double_point, pointsCount C.qdb_size_t) []TsDoublePoint {
length := int(pointsCount)
output := make([]TsDoublePoint, length)
if length > 0 {
slice := doublePointArrayToSlice(points, length)
for i, s := range slice {
output[i] = s.toStructG()
}
}
return output
}
// TsDoubleColumn : a time series double column
type TsDoubleColumn struct {
tsColumn
}
// DoubleColumn : create a column object
func (entry TimeseriesEntry) DoubleColumn(columnName string) TsDoubleColumn {
return TsDoubleColumn{tsColumn{NewTsColumnInfo(columnName, TsColumnDouble), entry}}
}
// Insert double points into a timeseries
func (column TsDoubleColumn) Insert(points ...TsDoublePoint) error {
alias := convertToCharStar(column.parent.alias)
defer releaseCharStar(alias)
columnName := convertToCharStar(column.name)
defer releaseCharStar(columnName)
contentCount := C.qdb_size_t(len(points))
content := doublePointArrayToC(points...)
err := C.qdb_ts_double_insert(column.parent.handle, alias, columnName, content, contentCount)
return makeErrorOrNil(err)
}
// EraseRanges : erase all points in the specified ranges
func (column TsDoubleColumn) EraseRanges(rgs ...TsRange) (uint64, error) {
alias := convertToCharStar(column.parent.alias)
defer releaseCharStar(alias)
columnName := convertToCharStar(column.name)
defer releaseCharStar(columnName)
ranges := rangeArrayToC(rgs...)
rangesCount := C.qdb_size_t(len(rgs))
erasedCount := C.qdb_uint_t(0)
err := C.qdb_ts_erase_ranges(column.parent.handle, alias, columnName, ranges, rangesCount, &erasedCount)
return uint64(erasedCount), makeErrorOrNil(err)
}
// GetRanges : Retrieves blobs in the specified range of the time series column.
// It is an error to call this function on a non existing time-series.
func (column TsDoubleColumn) GetRanges(rgs ...TsRange) ([]TsDoublePoint, error) {
alias := convertToCharStar(column.parent.alias)
defer releaseCharStar(alias)
columnName := convertToCharStar(column.name)
defer releaseCharStar(columnName)
ranges := rangeArrayToC(rgs...)
rangesCount := C.qdb_size_t(len(rgs))
var points *C.qdb_ts_double_point
var pointsCount C.qdb_size_t
err := C.qdb_ts_double_get_ranges(column.parent.handle, alias, columnName, ranges, rangesCount, &points, &pointsCount)
if err == 0 {
defer column.parent.Release(unsafe.Pointer(points))
return doublePointArrayToGo(points, pointsCount), nil
}
return nil, ErrorType(err)
}
// TsDoubleAggregation : Aggregation of double type
type TsDoubleAggregation struct {
kind TsAggregationType
rng TsRange
count int64
point TsDoublePoint
}
// Type : returns the type of the aggregation
func (t TsDoubleAggregation) Type() TsAggregationType {
return t.kind
}
// Range : returns the range of the aggregation
func (t TsDoubleAggregation) Range() TsRange {
return t.rng
}
// Count : returns the number of points aggregated into the result
func (t TsDoubleAggregation) Count() int64 {
return t.count
}
// Result : result of the aggregation
func (t TsDoubleAggregation) Result() TsDoublePoint {
return t.point
}
// NewDoubleAggregation : Create new timeseries double aggregation
func NewDoubleAggregation(kind TsAggregationType, rng TsRange) *TsDoubleAggregation {
return &TsDoubleAggregation{kind, rng, 0, TsDoublePoint{}}
}
// :: internals
func (t TsDoubleAggregation) toStructC() C.qdb_ts_double_aggregation_t {
var cAgg C.qdb_ts_double_aggregation_t
cAgg._type = C.qdb_ts_aggregation_type_t(t.kind)
cAgg._range = t.rng.toStructC()
cAgg.count = C.qdb_size_t(t.count)
cAgg.result = t.point.toStructC()
return cAgg
}
func (t C.qdb_ts_double_aggregation_t) toStructG() TsDoubleAggregation {
var gAgg TsDoubleAggregation
gAgg.kind = TsAggregationType(t._type)
gAgg.rng = t._range.toStructG()
gAgg.count = int64(t.count)
gAgg.point = t.result.toStructG()
return gAgg
}
func doubleAggregationArrayToC(ags ...*TsDoubleAggregation) *C.qdb_ts_double_aggregation_t {
if len(ags) == 0 {
return nil
}
var doubleAggregations []C.qdb_ts_double_aggregation_t
for _, ag := range ags {
doubleAggregations = append(doubleAggregations, ag.toStructC())
}
return &doubleAggregations[0]
}
func doubleAggregationArrayToSlice(aggregations *C.qdb_ts_double_aggregation_t, length int) []C.qdb_ts_double_aggregation_t {
// See https://github.com/mattn/go-sqlite3/issues/238 for details.
return (*[(math.MaxInt32 - 1) / unsafe.Sizeof(C.qdb_ts_double_aggregation_t{})]C.qdb_ts_double_aggregation_t)(unsafe.Pointer(aggregations))[:length:length]
}
func doubleAggregationArrayToGo(aggregations *C.qdb_ts_double_aggregation_t, aggregationsCount C.qdb_size_t, aggs []*TsDoubleAggregation) []TsDoubleAggregation {
length := int(aggregationsCount)
output := make([]TsDoubleAggregation, length)
if length > 0 {
slice := doubleAggregationArrayToSlice(aggregations, length)
for i, s := range slice {
*aggs[i] = s.toStructG()
output[i] = s.toStructG()
}
}
return output
}
// Aggregate : Aggregate a sub-part of a timeseries from the specified aggregations.
// It is an error to call this function on a non existing time-series.
func (column TsDoubleColumn) Aggregate(aggs ...*TsDoubleAggregation) ([]TsDoubleAggregation, error) {
alias := convertToCharStar(column.parent.alias)
defer releaseCharStar(alias)
columnName := convertToCharStar(column.name)
defer releaseCharStar(columnName)
aggregations := doubleAggregationArrayToC(aggs...)
aggregationsCount := C.qdb_size_t(len(aggs))
var output []TsDoubleAggregation
err := C.qdb_ts_double_aggregate(column.parent.handle, alias, columnName, aggregations, aggregationsCount)
if err == 0 {
output = doubleAggregationArrayToGo(aggregations, aggregationsCount, aggs)
}
return output, makeErrorOrNil(err)
}
// GetDouble : gets a double in row
func (t *TsBulk) GetDouble() (float64, error) {
var content C.double
err := C.qdb_ts_row_get_double(t.table, C.qdb_size_t(t.index), &content)
t.index++
return float64(content), makeErrorOrNil(err)
}
// RowSetDouble : Set double at specified index in current row
func (t *TsBatch) RowSetDouble(index int64, value float64) error {
valueIndex := C.qdb_size_t(index)
return makeErrorOrNil(C.qdb_ts_batch_row_set_double(t.table, valueIndex, C.double(value)))
}