Kyle Isom
6122123064
SQLite schema (services, components, ports, volumes, cmd, events), migrations, and complete CRUD operations. 7 tests covering: idempotent migration, service CRUD, duplicate name rejection, component CRUD with ports/volumes/cmd, composite PK enforcement, cascade delete, and event insert/query/count/prune. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
97 lines
2.7 KiB
Go
97 lines
2.7 KiB
Go
package registry
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import (
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"database/sql"
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"fmt"
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"time"
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)
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// Event represents a state-change event.
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type Event struct {
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ID int64
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Service string
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Component string
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PrevState string
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NewState string
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Timestamp time.Time
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}
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// InsertEvent records a state transition.
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func InsertEvent(db *sql.DB, service, component, prevState, newState string) error {
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_, err := db.Exec(
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"INSERT INTO events (service, component, prev_state, new_state) VALUES (?, ?, ?, ?)",
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service, component, prevState, newState,
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)
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if err != nil {
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return fmt.Errorf("insert event %q/%q: %w", service, component, err)
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}
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return nil
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}
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// QueryEvents returns events for a service/component within a time window.
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// If service is empty, returns events for all services.
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// If component is empty, returns events for all components in the service.
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func QueryEvents(db *sql.DB, service, component string, since time.Time, limit int) ([]Event, error) {
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query := "SELECT id, service, component, prev_state, new_state, timestamp FROM events WHERE timestamp > ?"
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args := []any{since.UTC().Format("2006-01-02 15:04:05")}
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if service != "" {
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query += " AND service = ?"
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args = append(args, service)
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}
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if component != "" {
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query += " AND component = ?"
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args = append(args, component)
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}
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query += " ORDER BY timestamp DESC"
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if limit > 0 {
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query += " LIMIT ?"
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args = append(args, limit)
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}
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rows, err := db.Query(query, args...)
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if err != nil {
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return nil, fmt.Errorf("query events: %w", err)
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}
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defer func() { _ = rows.Close() }()
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var events []Event
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for rows.Next() {
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var e Event
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var ts string
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if err := rows.Scan(&e.ID, &e.Service, &e.Component, &e.PrevState, &e.NewState, &ts); err != nil {
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return nil, fmt.Errorf("scan event: %w", err)
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}
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e.Timestamp, _ = time.Parse("2006-01-02 15:04:05", ts)
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events = append(events, e)
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}
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return events, rows.Err()
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}
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// CountEvents counts events for a component within a time window matching
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// a specific new_state. Used for flap detection.
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func CountEvents(db *sql.DB, service, component string, since time.Time) (int, error) {
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var count int
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err := db.QueryRow(
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"SELECT COUNT(*) FROM events WHERE service = ? AND component = ? AND timestamp > ?",
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service, component, since.UTC().Format("2006-01-02 15:04:05"),
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).Scan(&count)
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if err != nil {
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return 0, fmt.Errorf("count events %q/%q: %w", service, component, err)
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}
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return count, nil
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}
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// PruneEvents deletes events older than the given time.
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func PruneEvents(db *sql.DB, before time.Time) (int64, error) {
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res, err := db.Exec(
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"DELETE FROM events WHERE timestamp < ?",
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before.UTC().Format("2006-01-02 15:04:05"),
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)
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if err != nil {
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return 0, fmt.Errorf("prune events: %w", err)
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}
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return res.RowsAffected()
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}
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