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inventory.go
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inventory.go
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package db
import (
"crypto/sha256"
"database/sql"
"encoding/hex"
"errors"
"fmt"
"math/big"
"strconv"
"sync"
"github.com/OpenBazaar/openbazaar-go/repo"
)
type InventoryDB struct {
modelStore
}
func NewInventoryStore(db *sql.DB, lock *sync.Mutex) repo.InventoryStore {
return &InventoryDB{modelStore{db, lock}}
}
func (i *InventoryDB) Put(slug string, variantIndex int, count *big.Int) error {
i.lock.Lock()
defer i.lock.Unlock()
id := sha256.Sum256([]byte(slug + strconv.Itoa(variantIndex)))
stmt, err := i.PrepareQuery("insert or replace into inventory(invID, slug, variantIndex, count) values(?,?,?,?)")
if err != nil {
return fmt.Errorf("prepare inventory sql: %s", err.Error())
}
defer stmt.Close()
_, err = stmt.Exec(hex.EncodeToString(id[:]), slug, variantIndex, count.String())
if err != nil {
return fmt.Errorf("update inventory: %s", err.Error())
}
return nil
}
func (i *InventoryDB) GetSpecific(slug string, variantIndex int) (*big.Int, error) {
i.lock.Lock()
defer i.lock.Unlock()
stmt, err := i.db.Prepare("select count from inventory where slug=? and variantIndex=?")
if err != nil {
return big.NewInt(0), err
}
defer stmt.Close()
var countStr string
err = stmt.QueryRow(slug, variantIndex).Scan(&countStr)
if err != nil {
return big.NewInt(0), err
}
count, ok := new(big.Int).SetString(countStr, 10)
if !ok {
return nil, errors.New("error parsing count")
}
return count, nil
}
func (i *InventoryDB) Get(slug string) (map[int]*big.Int, error) {
i.lock.Lock()
defer i.lock.Unlock()
ret := make(map[int]*big.Int)
stmt, err := i.db.Prepare("select slug, variantIndex, count from inventory where slug=?")
if err != nil {
return ret, err
}
defer stmt.Close()
rows, err := stmt.Query(slug)
if err != nil {
return ret, err
}
defer rows.Close()
for rows.Next() {
var slug string
var countStr string
var variantIndex int
err = rows.Scan(&slug, &variantIndex, &countStr)
if err != nil {
log.Errorf("scanning inventory for (%s): %s", slug, err.Error())
}
count, ok := new(big.Int).SetString(countStr, 10)
if !ok {
log.Errorf("scanning inventory for (%s): error parsing count", slug)
count = big.NewInt(0)
}
ret[variantIndex] = count
}
if err := rows.Err(); err != nil {
log.Errorf("scanning inventory for (%s): %s", slug, err.Error())
}
return ret, nil
}
func (i *InventoryDB) GetAll() (map[string]map[int]*big.Int, error) {
i.lock.Lock()
defer i.lock.Unlock()
ret := make(map[string]map[int]*big.Int)
stm := "select slug, variantIndex, count from inventory"
rows, err := i.db.Query(stm)
if err != nil {
return ret, err
}
defer rows.Close()
for rows.Next() {
var slug string
var countStr string
var variantIndex int
err = rows.Scan(&slug, &variantIndex, &countStr)
if err != nil {
log.Error(err)
}
count, ok := new(big.Int).SetString(countStr, 10)
if !ok {
log.Errorf("scanning inventory for (%s): error parsing count", slug)
count = big.NewInt(0)
}
m, ok := ret[slug]
if !ok {
r := make(map[int]*big.Int)
r[variantIndex] = count
ret[slug] = r
} else {
m[variantIndex] = count
}
}
return ret, nil
}
func (i *InventoryDB) Delete(slug string, variantIndex int) error {
i.lock.Lock()
defer i.lock.Unlock()
_, err := i.db.Exec("delete from inventory where slug=? and variantIndex=?", slug, variantIndex)
return err
}
func (i *InventoryDB) DeleteAll(slug string) error {
i.lock.Lock()
defer i.lock.Unlock()
_, err := i.db.Exec("delete from inventory where slug=?", slug)
return err
}