105 lines
2.5 KiB
Go
105 lines
2.5 KiB
Go
package timeline
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import (
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"context"
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"database/sql"
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"fmt"
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"strings"
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"time"
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"reanimator/internal/domain"
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)
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type EventRepository struct {
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db *sql.DB
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}
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func NewEventRepository(db *sql.DB) *EventRepository {
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return &EventRepository{db: db}
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}
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type Cursor struct {
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Time time.Time
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ID string
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}
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func EncodeCursor(cursor Cursor) string {
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return fmt.Sprintf("%d:%s", cursor.Time.UnixNano(), cursor.ID)
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}
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func DecodeCursor(value string) (Cursor, error) {
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parts := strings.Split(value, ":")
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if len(parts) != 2 {
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return Cursor{}, fmt.Errorf("invalid cursor")
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}
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var ts int64
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if _, err := fmt.Sscanf(parts[0], "%d", &ts); err != nil {
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return Cursor{}, fmt.Errorf("invalid cursor timestamp")
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}
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if parts[1] == "" {
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return Cursor{}, fmt.Errorf("invalid cursor id")
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}
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return Cursor{Time: time.Unix(0, ts).UTC(), ID: parts[1]}, nil
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}
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func (r *EventRepository) List(ctx context.Context, subjectType string, subjectID string, limit int, cursor *Cursor) ([]domain.TimelineEvent, *Cursor, error) {
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if limit <= 0 {
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limit = 50
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}
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if limit > 200 {
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limit = 200
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}
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args := []any{subjectType, subjectID}
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query := `
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SELECT id, subject_type, subject_id, event_type, event_time, machine_id, part_id, firmware_version, created_at
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FROM timeline_events
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WHERE subject_type = ? AND subject_id = ?`
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if cursor != nil {
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query += " AND (event_time > ? OR (event_time = ? AND id > ?))"
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args = append(args, cursor.Time, cursor.Time, cursor.ID)
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}
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query += " ORDER BY event_time, id LIMIT ?"
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args = append(args, limit+1)
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rows, err := r.db.QueryContext(ctx, query, args...)
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if err != nil {
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return nil, nil, err
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}
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defer rows.Close()
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events := make([]domain.TimelineEvent, 0)
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for rows.Next() {
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var event domain.TimelineEvent
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var machineID sql.NullString
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var partID sql.NullString
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var firmware sql.NullString
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if err := rows.Scan(&event.ID, &event.SubjectType, &event.SubjectID, &event.EventType, &event.EventTime, &machineID, &partID, &firmware, &event.CreatedAt); err != nil {
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return nil, nil, err
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}
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if machineID.Valid {
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event.MachineID = &machineID.String
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}
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if partID.Valid {
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event.PartID = &partID.String
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}
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if firmware.Valid {
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event.FirmwareVersion = &firmware.String
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}
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events = append(events, event)
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}
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if err := rows.Err(); err != nil {
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return nil, nil, err
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}
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var nextCursor *Cursor
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if len(events) > limit {
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last := events[limit-1]
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nextCursor = &Cursor{Time: last.EventTime.UTC(), ID: last.ID}
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events = events[:limit]
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}
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return events, nextCursor, nil
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}
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