84 lines
1.9 KiB
Go
84 lines
1.9 KiB
Go
package metrics
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import (
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"errors"
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"time"
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"github.com/evcc-io/evcc/server/db"
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"github.com/evcc-io/evcc/tariff"
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"gorm.io/gorm"
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)
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type meter struct {
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Meter int `json:"meter" gorm:"column:meter;uniqueIndex:meter_ts"`
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Timestamp time.Time `json:"ts" gorm:"column:ts;uniqueIndex:meter_ts"`
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Value float64 `json:"val" gorm:"column:val"`
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}
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var ErrIncomplete = errors.New("meter profile incomplete")
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func init() {
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db.Register(func(db *gorm.DB) error {
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return db.AutoMigrate(new(meter))
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})
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}
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// Persist stores 15min consumption in Wh
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func Persist(ts time.Time, value float64) error {
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return db.Instance.Create(meter{
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Meter: 1,
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Timestamp: ts.Truncate(15 * time.Minute),
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Value: value,
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}).Error
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}
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// Profile returns a 15min average meter profile in Wh.
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// Profile is sorted by timestamp starting at 00:00. It is guaranteed to contain 96 15min values.
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func Profile(from time.Time) (*[96]float64, error) {
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db, err := db.Instance.DB()
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if err != nil {
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return nil, err
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}
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// Use 'localtime' in strftime to fix https://github.com/evcc-io/evcc/discussions/23759
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rows, err := db.Query(`SELECT min(ts) AS ts, avg(val) AS val
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FROM meters
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WHERE meter = ? AND ts >= ?
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GROUP BY strftime("%H:%M", ts, 'localtime')
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ORDER BY strftime("%H:%M", ts, 'localtime') ASC`, 1, from,
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)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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var prev time.Time
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res := make([]float64, 0, 96)
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for rows.Next() {
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var ts SqlTime
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var val float64
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if err := rows.Scan(&ts, &val); err != nil {
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return nil, err
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}
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// interpolate single missing value, maybe due to regular restarts?
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if time.Time(ts).Sub(prev) == 2*tariff.SlotDuration {
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res = append(res, (val+res[len(res)-1])/2)
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}
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prev = time.Time(ts)
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res = append(res, val)
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}
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if err := rows.Err(); err != nil {
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return nil, err
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}
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if len(res) != 96 {
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return nil, ErrIncomplete
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}
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return (*[96]float64)(res), nil
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}
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