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This is the first, most basic implementation of a SQLite database for caching. Future commits will make it much more optimized and able to efficiently store data for periods longer than 8 days.
75 lines
2.1 KiB
Go
75 lines
2.1 KiB
Go
package main
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import (
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"fmt"
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"time"
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)
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type CacheEntry struct {
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Date int64
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GreenEnergyPercentage float32
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PolledSmartEnergySummation float32
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}
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type CacheData []CacheEntry
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func (config Config) updateCache() {
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// in order to avoid querying and storing each day's data from 0001-01-01 in future versions
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if config.HomeAssistant.InstallationDate.IsZero() {
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return
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}
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now := time.Now()
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h, m, s := now.Clock()
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start := now.AddDate(0, 0, -7).Add(-(time.Duration(h)*time.Hour + time.Duration(m)*time.Minute + time.Duration(s)*time.Second))
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greenEnergyPercentage, err := config.historyAverageAndConvertToGreen(config.Sensors.FossilPercentage, start, now)
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if err != nil {
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fmt.Println("Error updating cached data for FossilPercentage -" + err.Error())
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return
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}
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historyPolledSmartEnergySummation, err := config.historyDelta(config.Sensors.PolledSmartEnergySummation, start, now)
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if err != nil {
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fmt.Println("Error updating cached data for PolledSmartEnergySummation -" + err.Error())
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return
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}
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_, err = config.db.Exec("DELETE FROM cache")
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if err != nil {
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fmt.Println("Error deleting previous records to cache: -", err.Error())
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return
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}
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for key, day := range greenEnergyPercentage {
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_, err := config.db.Exec("INSERT INTO cache(time,green_energy_percentage,energy_consumption) VALUES (?,?,?);", day.DayTime.Unix(), greenEnergyPercentage[key].Value, historyPolledSmartEnergySummation[key].Value)
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if err != nil {
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fmt.Println("Error adding record to cache: -", err.Error())
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return
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}
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}
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}
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func (config Config) readCache() (CacheData, error) {
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rows, err := config.db.Query("SELECT time, green_energy_percentage, energy_consumption FROM cache")
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if err != nil {
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return CacheData{}, err
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}
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defer rows.Close()
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var ret CacheData
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for rows.Next() {
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var (
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date int64
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greenEnergyPercentage float32
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polledSmartEnergyConsumption float32
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)
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err = rows.Scan(&date, &greenEnergyPercentage, &polledSmartEnergyConsumption)
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ret = append(ret, CacheEntry{date, greenEnergyPercentage, polledSmartEnergyConsumption})
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}
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return ret, nil
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}
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