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list.go
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list.go
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package nzhkb
import (
"fmt"
"time"
"github.com/mattn/go-nulltype"
"github.com/whitewater-guide/gorge/core"
)
const (
endpointLevels = "8"
endpointFlow = "7"
paramsGauges = "where=1%3D1&outFields=ObjectID,Hilltop_Site,Hydrotel_Units,URL&outSR=4326&f=json"
paramsMeasurements = "where=1%3D1&outFields=ObjectID,Hydrotel_LastSampleTime,Hydrotel_CurrentValue&returnGeometry=false&outSR=4326&f=json"
)
func (s *scriptNzhkb) fetchList(endpoint string, params string) ([]hkbFeature, error) {
var data hkbList
url := fmt.Sprintf("%s/%s/query?%s", s.url, endpoint, params)
err := core.Client.GetAsJSON(url, &data, nil)
if err != nil {
return nil, err
}
return data.Features, nil
}
func (s *scriptNzhkb) fetchGauges() (core.Gauges, error) {
flows, err := s.fetchList(endpointFlow, paramsGauges)
if err != nil {
return nil, err
}
levels, err := s.fetchList(endpointLevels, paramsGauges)
if err != nil {
return nil, err
}
byCode := map[int]core.Gauge{}
newGauge := func(item hkbFeature) core.Gauge {
return core.Gauge{
GaugeID: core.GaugeID{
Script: s.name,
Code: fmt.Sprint(item.Attributes.ObjectID),
},
Name: item.Attributes.HilltopSite,
URL: item.Attributes.URL,
Location: &core.Location{
Latitude: core.TruncCoord(item.Geometry.X),
Longitude: core.TruncCoord(item.Geometry.Y),
},
}
}
for _, i := range levels {
g := newGauge(i)
g.LevelUnit = i.Attributes.HydrotelUnits
byCode[i.Attributes.ObjectID] = g
}
for _, i := range flows {
g, ok := byCode[i.Attributes.ObjectID]
if !ok {
g = newGauge(i)
}
g.FlowUnit = i.Attributes.HydrotelUnits
if g.FlowUnit == "m³/s" {
g.FlowUnit = "m3/s"
}
byCode[i.Attributes.ObjectID] = g
}
result := make(core.Gauges, len(byCode))
j := 0
for _, v := range byCode {
result[j] = v
j++
}
return result, nil
}
func (s *scriptNzhkb) fetchMeasurements(recv chan<- *core.Measurement, errs chan<- error) {
flows, err := s.fetchList(endpointFlow, paramsMeasurements)
if err != nil {
errs <- err
return
}
levels, err := s.fetchList(endpointLevels, paramsMeasurements)
if err != nil {
errs <- err
return
}
byCode := map[int]core.Measurement{}
newMeasurement := func(item hkbFeature) core.Measurement {
return core.Measurement{
GaugeID: core.GaugeID{
Script: s.name,
Code: fmt.Sprint(item.Attributes.ObjectID),
},
Timestamp: core.HTime{Time: time.Unix(item.Attributes.HydrotelLastSampleTime/1000, 0).UTC()},
}
}
for _, i := range levels {
m := newMeasurement(i)
m.Level = nulltype.NullFloat64Of(i.Attributes.HydrotelCurrentValue)
byCode[i.Attributes.ObjectID] = m
}
for _, i := range flows {
m, ok := byCode[i.Attributes.ObjectID]
if !ok {
m = newMeasurement(i)
}
m.Flow = nulltype.NullFloat64Of(i.Attributes.HydrotelCurrentValue)
byCode[i.Attributes.ObjectID] = m
}
for _, v := range byCode {
vv := v
recv <- &vv
}
}