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following.go
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following.go
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package db
import (
"database/sql"
"strconv"
"sync"
"github.com/OpenBazaar/openbazaar-go/repo"
)
type FollowingDB struct {
modelStore
}
func NewFollowingStore(db *sql.DB, lock *sync.Mutex) repo.FollowingStore {
return &FollowingDB{modelStore{db, lock}}
}
func (f *FollowingDB) Put(follower string) error {
f.lock.Lock()
defer f.lock.Unlock()
tx, _ := f.db.Begin()
stmt, _ := tx.Prepare("insert into following(peerID) values(?)")
defer stmt.Close()
_, err := stmt.Exec(follower)
if err != nil {
tx.Rollback()
return err
}
tx.Commit()
return nil
}
func (f *FollowingDB) Get(offsetId string, limit int) ([]string, error) {
f.lock.Lock()
defer f.lock.Unlock()
var stm string
if offsetId != "" {
stm = "select peerID from following order by rowid desc limit " + strconv.Itoa(limit) + " offset ((select coalesce(max(rowid)+1, 0) from following)-(select rowid from following where peerID='" + offsetId + "'))"
} else {
stm = "select peerID from following order by rowid desc limit " + strconv.Itoa(limit) + " offset 0"
}
var ret []string
rows, err := f.db.Query(stm)
if err != nil {
return ret, err
}
defer rows.Close()
for rows.Next() {
var peerID string
rows.Scan(&peerID)
ret = append(ret, peerID)
}
return ret, nil
}
func (f *FollowingDB) Delete(follower string) error {
f.lock.Lock()
defer f.lock.Unlock()
f.db.Exec("delete from following where peerID=?", follower)
return nil
}
func (f *FollowingDB) Count() int {
f.lock.Lock()
defer f.lock.Unlock()
row := f.db.QueryRow("select Count(*) from following")
var count int
row.Scan(&count)
return count
}
func (f *FollowingDB) IsFollowing(peerId string) bool {
f.lock.Lock()
defer f.lock.Unlock()
stmt, err := f.db.Prepare("select peerID from following where peerID=?")
defer stmt.Close()
var follower string
err = stmt.QueryRow(peerId).Scan(&follower)
if err != nil {
return false
}
return true
}