308 lines
7.3 KiB
Go
308 lines
7.3 KiB
Go
package store
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import (
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"context"
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"crypto/subtle"
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"database/sql"
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"errors"
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"os"
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"path/filepath"
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"strings"
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"time"
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"mengyamonitor-backend-server/internal/model"
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"github.com/google/uuid"
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_ "modernc.org/sqlite"
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)
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type Store struct {
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db *sql.DB
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}
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func Open(dbPath string) (*Store, error) {
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dir := filepath.Dir(dbPath)
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if dir != "." && dir != "" {
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if err := os.MkdirAll(dir, 0o755); err != nil {
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return nil, err
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}
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}
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db, err := sql.Open("sqlite", dbPath+"?_pragma=foreign_keys(1)")
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if err != nil {
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return nil, err
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}
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if err := db.Ping(); err != nil {
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_ = db.Close()
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return nil, err
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}
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s := &Store{db: db}
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if err := s.migrate(); err != nil {
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_ = db.Close()
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return nil, err
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}
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return s, nil
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}
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func (s *Store) Close() error {
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return s.db.Close()
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}
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func (s *Store) migrate() error {
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const ddl = `
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CREATE TABLE IF NOT EXISTS servers (
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id TEXT PRIMARY KEY,
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name TEXT NOT NULL,
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url TEXT NOT NULL,
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enabled INTEGER NOT NULL DEFAULT 1,
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sort_order INTEGER NOT NULL DEFAULT 0,
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created_at TEXT NOT NULL
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);
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CREATE INDEX IF NOT EXISTS idx_servers_sort ON servers(sort_order);
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`
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if _, err := s.db.Exec(ddl); err != nil {
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return err
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}
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return s.ensureAgentKeyColumn()
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}
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func (s *Store) ensureAgentKeyColumn() error {
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rows, err := s.db.Query(`PRAGMA table_info(servers)`)
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if err != nil {
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return err
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}
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defer rows.Close()
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for rows.Next() {
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var cid int
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var name, typ string
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var notnull, pk int
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var dflt sql.NullString
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if err := rows.Scan(&cid, &name, &typ, ¬null, &dflt, &pk); err != nil {
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return err
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}
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if name == "agent_key" {
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return nil
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}
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}
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if err := rows.Err(); err != nil {
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return err
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}
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if _, err = s.db.Exec(`ALTER TABLE servers ADD COLUMN agent_key TEXT`); err != nil {
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return err
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}
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// Backfill keys for existing rows so gRPC can be enabled without manual SQL.
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bRows, err := s.db.Query(`SELECT id FROM servers WHERE agent_key IS NULL OR agent_key = ''`)
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if err != nil {
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return err
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}
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var ids []string
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for bRows.Next() {
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var id string
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if err := bRows.Scan(&id); err != nil {
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_ = bRows.Close()
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return err
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}
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ids = append(ids, id)
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}
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_ = bRows.Close()
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for _, id := range ids {
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if _, err := s.db.Exec(`UPDATE servers SET agent_key = ? WHERE id = ?`, uuid.NewString(), id); err != nil {
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return err
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}
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}
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return nil
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}
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func (s *Store) ListEnabled(ctx context.Context) ([]model.MonitoredServer, error) {
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rows, err := s.db.QueryContext(ctx, `
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SELECT id, name, url, enabled, sort_order, agent_key, created_at
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FROM servers WHERE enabled = 1 ORDER BY sort_order ASC, created_at ASC`)
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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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return scanServers(rows)
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}
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func (s *Store) ListAll(ctx context.Context) ([]model.MonitoredServer, error) {
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rows, err := s.db.QueryContext(ctx, `
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SELECT id, name, url, enabled, sort_order, agent_key, created_at
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FROM servers ORDER BY sort_order ASC, created_at ASC`)
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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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return scanServers(rows)
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}
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func scanServers(rows *sql.Rows) ([]model.MonitoredServer, error) {
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out := make([]model.MonitoredServer, 0)
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for rows.Next() {
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var m model.MonitoredServer
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var enabled int
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var created, agKey sql.NullString
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if err := rows.Scan(&m.ID, &m.Name, &m.URL, &enabled, &m.SortOrder, &agKey, &created); err != nil {
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return nil, err
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}
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m.Enabled = enabled != 0
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if agKey.Valid {
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m.AgentKey = agKey.String
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}
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if t, err := time.Parse(time.RFC3339Nano, created.String); err == nil {
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m.CreatedAt = t
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}
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out = append(out, m)
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}
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return out, rows.Err()
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}
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func (s *Store) Create(ctx context.Context, in model.CreateServerInput) (*model.MonitoredServer, error) {
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name := strings.TrimSpace(in.Name)
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urlStr := normalizeURL(strings.TrimSpace(in.URL))
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if name == "" {
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return nil, errors.New("invalid name")
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}
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enabled := true
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if in.Enabled != nil {
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enabled = *in.Enabled
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}
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var maxOrder int
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_ = s.db.QueryRowContext(ctx, `SELECT COALESCE(MAX(sort_order), -1) FROM servers`).Scan(&maxOrder)
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id := uuid.NewString()
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agentKey := uuid.NewString()
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now := time.Now().UTC()
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_, err := s.db.ExecContext(ctx, `
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INSERT INTO servers (id, name, url, enabled, sort_order, agent_key, created_at)
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VALUES (?, ?, ?, ?, ?, ?, ?)`,
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id, name, urlStr, boolToInt(enabled), maxOrder+1, agentKey, now.Format(time.RFC3339Nano))
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if err != nil {
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return nil, err
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}
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return &model.MonitoredServer{
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ID: id, Name: name, URL: urlStr, Enabled: enabled, SortOrder: maxOrder + 1, AgentKey: agentKey, CreatedAt: now,
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}, nil
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}
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func (s *Store) Update(ctx context.Context, id string, in model.UpdateServerInput) (*model.MonitoredServer, error) {
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cur, err := s.Get(ctx, id)
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if err != nil {
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return nil, err
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}
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name := cur.Name
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urlStr := cur.URL
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enabled := cur.Enabled
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if in.Name != "" {
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name = strings.TrimSpace(in.Name)
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}
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if in.URL != nil {
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urlStr = normalizeURL(strings.TrimSpace(*in.URL))
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}
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if in.Enabled != nil {
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enabled = *in.Enabled
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}
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if name == "" {
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return nil, errors.New("invalid name")
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}
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agentKey := cur.AgentKey
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if in.AgentKey != nil {
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agentKey = *in.AgentKey
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}
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_, err = s.db.ExecContext(ctx, `UPDATE servers SET name = ?, url = ?, enabled = ?, agent_key = ? WHERE id = ?`,
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name, urlStr, boolToInt(enabled), nullIfEmpty(agentKey), id)
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if err != nil {
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return nil, err
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}
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cur.Name, cur.URL, cur.Enabled, cur.AgentKey = name, urlStr, enabled, agentKey
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return cur, nil
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}
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func (s *Store) Get(ctx context.Context, id string) (*model.MonitoredServer, error) {
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var m model.MonitoredServer
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var enabled int
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var created, agKey sql.NullString
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err := s.db.QueryRowContext(ctx, `
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SELECT id, name, url, enabled, sort_order, agent_key, created_at FROM servers WHERE id = ?`, id).
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Scan(&m.ID, &m.Name, &m.URL, &enabled, &m.SortOrder, &agKey, &created)
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if errors.Is(err, sql.ErrNoRows) {
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return nil, err
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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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m.Enabled = enabled != 0
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if agKey.Valid {
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m.AgentKey = agKey.String
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}
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if t, err := time.Parse(time.RFC3339Nano, created.String); err == nil {
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m.CreatedAt = t
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}
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return &m, nil
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}
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// VerifyAgent checks server_id + agent_key for gRPC ingest.
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func (s *Store) VerifyAgent(ctx context.Context, id, key string) (*model.MonitoredServer, error) {
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srv, err := s.Get(ctx, id)
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if err != nil {
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return nil, err
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}
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if !srv.Enabled {
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return nil, errors.New("disabled")
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}
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if srv.AgentKey == "" {
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return nil, errors.New("agent_key not set")
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}
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if subtle.ConstantTimeCompare([]byte(srv.AgentKey), []byte(key)) != 1 {
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return nil, errors.New("invalid agent_key")
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}
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return srv, nil
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}
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func nullIfEmpty(s string) any {
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if s == "" {
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return nil
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}
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return s
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}
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func (s *Store) Delete(ctx context.Context, id string) error {
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res, err := s.db.ExecContext(ctx, `DELETE FROM servers WHERE id = ?`, id)
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if err != nil {
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return err
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}
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n, _ := res.RowsAffected()
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if n == 0 {
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return sql.ErrNoRows
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}
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return nil
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}
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func (s *Store) Reorder(ctx context.Context, ids []string) error {
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tx, err := s.db.BeginTx(ctx, nil)
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if err != nil {
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return err
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}
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defer func() { _ = tx.Rollback() }()
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for i, id := range ids {
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if _, err := tx.ExecContext(ctx, `UPDATE servers SET sort_order = ? WHERE id = ?`, i, id); err != nil {
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return err
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}
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}
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return tx.Commit()
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}
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func boolToInt(b bool) int {
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if b {
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return 1
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}
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return 0
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}
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func normalizeURL(u string) string {
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if u == "" {
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return ""
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}
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if !strings.HasPrefix(strings.ToLower(u), "http://") && !strings.HasPrefix(strings.ToLower(u), "https://") {
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return "http://" + u
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}
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return u
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}
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