func UrlDriver(db *db.Database, l logging.Logger) *urlDriver {
return &urlDriver{
UrlCollection: urls.Collection(db, l),
lastseen: make(map[string]bson.ObjectId),
l: l,
}
}
func main() {
flag.Parse()
log = logging.NewFromFlags()
// Let's go find some mongo.
mdb, err := db.Connect("localhost")
if err != nil {
log.Fatal("Oh no: %v", err)
}
defer mdb.Session.Close()
uc := urls.Collection(mdb, log)
work := make(chan *urls.Url)
quit := make(chan bool)
urls := make(chan *urls.Url)
rows := make(chan []interface{})
failed := 0
// If we're checking, spin up some workers
if *check {
for i := 1; i <= *workq; i++ {
go func(n int) {
count := 0
for u := range work {
count++
log.Debug("w%02d r%04d: Fetching '%s'", n, count, u.Url)
res, err := http.Head(u.Url)
log.Debug("w%02d r%04d: Response '%s'", n, count, res.Status)
if err == nil && res.StatusCode == 200 {
urls <- u
} else {
failed++
}
}
quit <- true
}(i)
}
}
// Function to feed rows into the rows channel.
row_feeder := func(sth *sqlite3.Statement, row ...interface{}) {
rows <- row
}
// Function to execute a query on the SQLite db.
db_query := func(dbh *sqlite3.Database) {
n, err := dbh.Execute("SELECT * FROM urls;", row_feeder)
if err == nil {
log.Info("Read %d rows from database.\n", n)
} else {
log.Error("DB error: %s\n", err)
}
}
// Open up the URL database in a goroutine and feed rows
// in on the input_rows channel.
go func() {
sqlite3.Session(*file, db_query)
// once we've done the query, close the channel to indicate this
close(rows)
}()
// Another goroutine to munge the rows into Urls and optionally send
// them to the pool of checker goroutines.
go func() {
for row := range rows {
u := parseUrl(row)
if *check {
work <- u
} else {
urls <- u
}
}
if *check {
// Close work channel and wait for all workers to quit.
close(work)
for i := 0; i < *workq; i++ {
<-quit
}
}
close(urls)
}()
// And finally...
count := 0
for u := range urls {
// ... push each url into mongo
err = uc.Insert(u)
if err != nil {
log.Error("Awww: %v\n", err)
} else {
if count%1000 == 0 {
fmt.Printf("%d...", count)
}
count++
}
}
fmt.Println("done.")
if *check {
log.Info("Dropped %d non-200 urls.", failed)
}
log.Info("Inserted %d urls.", count)
}