126 lines
3.1 KiB
Go
126 lines
3.1 KiB
Go
package storage
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import (
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"context"
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"fmt"
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"time"
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"github.com/google/uuid"
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influxdb2 "github.com/influxdata/influxdb-client-go/v2"
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)
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//influxStorage is the Storage implementation for InfluxDB
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type influxStorage struct {
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token string
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bucket string
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organization string
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url string
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measurement string
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client influxdb2.Client
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}
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//NewInfluxStorage Factory
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func NewInfluxStorage(token, bucket, organization, url string) (*influxStorage, error) {
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influx := new(influxStorage)
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influx.bucket = bucket
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influx.token = token
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influx.organization = organization
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influx.url = url
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influx.client = influxdb2.NewClient(url, token)
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influx.measurement = "data"
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return influx, nil
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}
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//Save WeatherData to InfluxDB
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func (storage *influxStorage) Save(data WeatherData) error {
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tags := map[string]string{
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"sensorId": data.SensorId.String()}
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fields := map[string]interface{}{
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"temperature": data.Temperature,
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"humidity": data.Humidity,
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"pressure": data.Pressure,
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"co2level": data.CO2Level}
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datapoint := influxdb2.NewPoint(storage.measurement,
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tags,
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fields,
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data.TimeStamp)
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writeAPI := storage.client.WriteAPI(storage.organization, storage.bucket)
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writeAPI.WritePoint(datapoint)
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return nil
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}
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//GetData datapoints from InfluxDB
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func (storage *influxStorage) GetData() ([]*WeatherData, error) {
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query := fmt.Sprintf("from(bucket:\"%v\")|> range(start: -40m, stop: -20m) |> filter(fn: (r) => r._measurement == \"data\" and r.location == \"Hamburg\")", storage.bucket)
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res, err := storage.executeFluxQuery(query)
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return res, err
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}
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func (storage *influxStorage) executeFluxQuery(query string) ([]*WeatherData, error) {
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queryAPI := storage.client.QueryAPI(storage.organization)
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result, err := queryAPI.Query(context.Background(), query)
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if err != nil {
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return nil, err
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}
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var queryResults []*WeatherData
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for result.Next() {
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if result.Err() != nil {
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return nil, result.Err()
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}
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timestamp := result.Record().Time()
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sensorId, err := uuid.Parse(result.Record().ValueByKey("sensorId").(string))
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if err != nil {
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return nil, err
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}
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data, contained := containsWeatherData(queryResults, sensorId, timestamp)
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if result.Record().Field() == "temperature" {
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data.Temperature = result.Record().Value().(float64)
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}
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if result.Record().Field() == "pressure" {
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data.Pressure = result.Record().Value().(float64)
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}
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if result.Record().Field() == "humidity" {
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data.Humidity = result.Record().Value().(float64)
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}
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if result.Record().Field() == "co2level" {
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data.CO2Level = result.Record().Value().(float64)
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}
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if !contained {
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data.SensorId = sensorId
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data.TimeStamp = timestamp
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queryResults = append(queryResults, data)
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}
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}
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return queryResults, nil
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}
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func containsWeatherData(weatherData []*WeatherData, sensorId uuid.UUID, timestamp time.Time) (*WeatherData, bool) {
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for _, val := range weatherData {
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if val.SensorId == sensorId && val.TimeStamp == timestamp {
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return val, true
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}
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}
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var newData WeatherData
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return &newData, false
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}
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//Close InfluxDB connection
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func (storage *influxStorage) Close() error {
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storage.client.Close()
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return nil
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}
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