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|
package dhtsearch
import (
"fmt"
"time"
)
// Data for persistent storage
type Torrent struct {
Id int `json:"-"`
InfoHash string `json:"infohash"`
Name string `json:"name"`
Files []File `json:"files" db:"-"`
Size int `json:"size"`
Seen time.Time `json:"seen"`
Tags []string `json:"tags" db:"-"`
}
type File struct {
Id int `json:"-"`
Path string `json:"path"`
Size int `json:"size"`
TorrentId int `json:"torrent_id" db:"torrent_id"`
}
func torrentExists(ih string) bool {
rows, err := DB.Query(sqlGetTorrent, fmt.Sprintf("%s", ih))
defer rows.Close()
if err != nil {
fmt.Printf("Failed to exec SQL: %q\n", err)
return false
}
return rows.Next()
}
func (t *Torrent) save() error {
tx, err := DB.Begin()
if err != nil {
fmt.Printf("Transaction err %q\n", err)
}
defer tx.Commit()
var torrentId int
// Need to turn infohash into string here
err = tx.QueryRow(sqlInsertTorrent, t.Name, fmt.Sprintf("%s", t.InfoHash), t.Size).Scan(&torrentId)
if err != nil {
tx.Rollback()
return err
}
// Write tags
for _, tag := range t.Tags {
tagId, err := createTag(tag)
if err != nil {
tx.Rollback()
return err
}
_, err = tx.Exec(sqlInsertTagTorrent, tagId, torrentId)
if err != nil {
tx.Rollback()
return err
}
}
// Write files
for _, f := range t.Files {
_, err := tx.Exec(sqlInsertFile, torrentId, f.Path, f.Size)
if err != nil {
tx.Rollback()
return err
}
}
// Should this be outside the transaction?
tx.Exec(sqlUpdateFTSVectors, torrentId)
if err != nil {
tx.Rollback()
return err
}
return nil
}
// Fill in a torrents dependant data
func (t *Torrent) load() (err error) {
// Files
t.Files = []File{}
err = DB.Select(&t.Files, sqlSelectFiles, t.Id)
if err != nil {
fmt.Printf("Error selecting files %s\n", err)
}
// t.Files = files
// Tags
t.Tags = []string{}
err = DB.Select(&t.Tags, sqlSelectTags, t.Id)
if err != nil {
fmt.Printf("Error selecting tags %s\n", err)
}
return
}
func torrentsByName(query string, offset int) ([]Torrent, error) {
torrents := []Torrent{}
err := DB.Select(&torrents, sqlSearchTorrents, fmt.Sprintf("%%%s%%", query), offset)
if err != nil {
return nil, err
}
fmt.Printf("Search for %q returned %d torrents\n", query, len(torrents))
for idx, _ := range torrents {
torrents[idx].load()
}
return torrents, nil
}
func torrentsByTag(tag string, offset int) ([]Torrent, error) {
torrents := []Torrent{}
err := DB.Select(&torrents, sqlTorrentsByTag, tag, offset)
if err != nil {
return nil, err
}
fmt.Printf("Search for tag %q returned %d torrents\n", tag, len(torrents))
for idx, _ := range torrents {
torrents[idx].load()
}
return torrents, nil
}
const (
sqlGetTorrent = `update torrents
set seen = now()
where infohash = $1
returning id`
sqlInsertTorrent = `insert into torrents (
name, infohash, size, seen
) values (
$1, $2, $3, now()
) on conflict (infohash) do
update set seen = now()
returning id`
sqlUpdateFTSVectors = `update torrents
set tsv = sub.tsv from (
select t.id,
setweight(to_tsvector(translate(t.name, '._-', ' ')), 'A') ||
setweight(to_tsvector(translate(string_agg(coalesce(f.path, ''), ' '), './_-', ' ')), 'B') as tsv
from torrents t
left join files f on t.id = f.torrent_id
where t.id = $1
group by t.id
) as sub
where sub.id = torrents.id`
sqlSearchTorrents = `
select t.id, t.infohash, t.name, t.size, t.seen
from torrents t
where t.tsv @@ plainto_tsquery($1)
order by ts_rank(tsv, plainto_tsquery($1)) desc, t.seen desc
limit 50 offset $2`
sqlTorrentsByTag = `
select t.id, t.infohash, t.name, t.size, t.seen
from torrents t
inner join tags_torrents tt on t.id = tt.torrent_id
inner join tags ta on tt.tag_id = ta.id
where ta.name = $1 group by t.id
order by seen desc
limit 50 offset $2`
sqlSelectFiles = `select * from files
where torrent_id = $1
order by path asc`
sqlInsertFile = `insert into files (
torrent_id, path, size
) values($1, $2, $3)`
sqlSelectTags = `select name
from tags t
inner join tags_torrents tt on t.id = tt.tag_id
where tt.torrent_id = $1`
sqlInsertTagTorrent = `insert into tags_torrents (
tag_id, torrent_id
) values ($1, $2)
on conflict do nothing`
)
|
