73 lines
1.4 KiB
Go
73 lines
1.4 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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)
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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() error {
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return db.Instance.AutoMigrate(new(meter))
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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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func Profile() (*[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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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 = ?
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GROUP BY strftime("%H:%M", ts)
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ORDER BY ts`, 1)
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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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res := make([]float64, 0, 96)
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for rows.Next() {
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var (
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ts time.Time
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val float64
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)
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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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hour := ts.Hour()
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minute := ts.Minute() / 15
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if len(res) != hour*4+minute {
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return nil, ErrIncomplete
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}
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res = append(res, val)
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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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