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package main
import (
"fmt"
"log"
"regexp"
_ "github.com/go-sql-driver/mysql"
"github.com/jmoiron/sqlx"
)
type App struct {
Config *Config
DB *sqlx.DB
}
type LinkRow struct {
ID int `db:"id"`
URL string `db:"url"`
}
var imdbTitleRe = regexp.MustCompile(`/title/(tt\d+)($|/)`)
var imdbIDRe = regexp.MustCompile(`^(tt\d+)$`)
func (a *App) populateImdbTable() error {
// Gather all IMDb IDs already in the table to avoid duplicates
existing, err := a.getExistingImdbIDs()
if err != nil {
return fmt.Errorf("getExistingImdbIDs: %w", err)
}
rows, err := a.DB.Query(`
SELECT DISTINCT param FROM links
WHERE host = 'www.imdb.com' AND param IS NOT NULL AND param != ''
`)
if err != nil {
return fmt.Errorf("query links: %w", err)
}
defer rows.Close()
tx := a.DB.MustBegin()
stmt, err := tx.Prepare(`INSERT INTO imdb (imdb_id) VALUES (?)`)
if err != nil {
tx.Rollback()
return fmt.Errorf("prepare insert: %w", err)
}
defer stmt.Close()
var inserted, skipped int
for rows.Next() {
var param string
if err := rows.Scan(¶m); err != nil {
tx.Rollback()
return fmt.Errorf("scan param: %w", err)
}
if !imdbIDRe.MatchString(param) {
log.Printf("populateImdbTable: invalid param %q, skipping", param)
continue
}
if existing[param] {
skipped++
continue
}
_, err := stmt.Exec(param)
if err != nil {
tx.Rollback()
return fmt.Errorf("insert %s: %w", param, err)
}
inserted++
existing[param] = true
}
if err := rows.Err(); err != nil {
tx.Rollback()
return fmt.Errorf("rows iteration: %w", err)
}
if err := tx.Commit(); err != nil {
return fmt.Errorf("commit: %w", err)
}
log.Printf("populateImdbTable: inserted %d, skipped %d (already existed)", inserted, skipped)
return nil
}
func (a *App) getExistingImdbIDs() (map[string]bool, error) {
rows, err := a.DB.Query(`SELECT imdb_id FROM imdb`)
if err != nil {
return nil, fmt.Errorf("query imdb: %w", err)
}
defer rows.Close()
existing := make(map[string]bool)
for rows.Next() {
var imdbID string
if err := rows.Scan(&imdbID); err != nil {
return nil, fmt.Errorf("scan imdb_id: %w", err)
}
existing[imdbID] = true
}
if err := rows.Err(); err != nil {
return nil, fmt.Errorf("rows iteration: %w", err)
}
log.Printf("getExistingImdbIDs: %d existing records", len(existing))
return existing, nil
}
func (a *App) extractImdbIDs() error {
rows, err := a.DB.Query(`
SELECT id, url FROM links
WHERE field = 1 AND url LIKE '%.com/title%' AND host = 'www.imdb.com'
AND (param IS NULL OR param = '')
`)
if err != nil {
return fmt.Errorf("query links: %w", err)
}
defer rows.Close()
var count, updated int
tx := a.DB.MustBegin()
stmt, err := tx.Prepare(`UPDATE links SET param = ? WHERE id = ?`)
if err != nil {
tx.Rollback()
return fmt.Errorf("prepare update: %w", err)
}
defer stmt.Close()
for rows.Next() {
count++
var link LinkRow
if err := rows.Scan(&link.ID, &link.URL); err != nil {
tx.Rollback()
return fmt.Errorf("scan row: %w", err)
}
match := imdbTitleRe.FindStringSubmatch(link.URL)
if len(match) < 2 {
log.Printf("no IMDb ID found in URL: %s", link.URL)
continue
}
imdbID := match[1]
_, err := stmt.Exec(imdbID, link.ID)
if err != nil {
tx.Rollback()
return fmt.Errorf("update link %d: %w", link.ID, err)
}
updated++
}
if err := rows.Err(); err != nil {
tx.Rollback()
return fmt.Errorf("rows iteration: %w", err)
}
if err := tx.Commit(); err != nil {
return fmt.Errorf("commit: %w", err)
}
log.Printf("extractImdbIDs: scanned %d rows, updated %d", count, updated)
return nil
}
func main() {
cfg, err := LoadConfig("config.json")
if err != nil {
log.Fatalf("failed to load config: %v", err)
}
app := App{Config: cfg}
log.Printf(`Connecting to "%s" database "%s" as user "%s" on host "%s:%s" with extra options "%s".`, cfg.DBDriver, cfg.DBDBName, cfg.DBUser, cfg.DBHost, cfg.DBPort, cfg.DBOptions)
app.DB, err = sqlx.Connect(cfg.DBDriver, cfg.DBUser+":"+cfg.DBPassword+"@tcp("+cfg.DBHost+":"+cfg.DBPort+")/"+cfg.DBDBName+"?"+cfg.DBOptions)
if err != nil {
log.Fatal(err, "Cannot connect to database")
}
if err = app.DB.Ping(); err != nil {
log.Fatal(err, "No connection to database")
}
defer app.DB.Close()
if err = app.extractImdbIDs(); err != nil {
log.Fatalf("extractImdbIDs: %v", err)
}
if err = app.populateImdbTable(); err != nil {
log.Fatalf("populateImdbTable: %v", err)
}
if err = app.fetchAndUpdateImdbData(); err != nil {
log.Fatalf("fetchAndUpdateImdbData: %v", err)
}
}
|
