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item.go
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item.go
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package keeper
import (
"encoding/binary"
"github.com/cosmos/cosmos-sdk/store/prefix"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/harish551/cosmostore/x/store/types"
)
// GetItemCount get the total number of item
func (k Keeper) GetItemCount(ctx sdk.Context) uint64 {
store := prefix.NewStore(ctx.KVStore(k.storeKey), []byte{})
byteKey := types.KeyPrefix(types.ItemCountKey)
bz := store.Get(byteKey)
// Count doesn't exist: no element
if bz == nil {
return 0
}
// Parse bytes
return binary.BigEndian.Uint64(bz)
}
// SetItemCount set the total number of item
func (k Keeper) SetItemCount(ctx sdk.Context, count uint64) {
store := prefix.NewStore(ctx.KVStore(k.storeKey), []byte{})
byteKey := types.KeyPrefix(types.ItemCountKey)
bz := make([]byte, 8)
binary.BigEndian.PutUint64(bz, count)
store.Set(byteKey, bz)
}
// AppendItem appends a item in the store with a new id and update the count
func (k Keeper) AppendItem(
ctx sdk.Context,
item types.Item,
) uint64 {
// Create the item
count := k.GetItemCount(ctx)
// Set the ID of the appended value
item.Id = count
store := prefix.NewStore(ctx.KVStore(k.storeKey), types.KeyPrefix(types.ItemKey))
appendedValue := k.cdc.MustMarshal(&item)
store.Set(GetItemIDBytes(item.Id), appendedValue)
// Update item count
k.SetItemCount(ctx, count+1)
return count
}
// SetItem set a specific item in the store
func (k Keeper) SetItem(ctx sdk.Context, item types.Item) {
store := prefix.NewStore(ctx.KVStore(k.storeKey), types.KeyPrefix(types.ItemKey))
b := k.cdc.MustMarshal(&item)
store.Set(GetItemIDBytes(item.Id), b)
}
// GetItem returns a item from its id
func (k Keeper) GetItem(ctx sdk.Context, id uint64) (val types.Item, found bool) {
store := prefix.NewStore(ctx.KVStore(k.storeKey), types.KeyPrefix(types.ItemKey))
b := store.Get(GetItemIDBytes(id))
if b == nil {
return val, false
}
k.cdc.MustUnmarshal(b, &val)
return val, true
}
// RemoveItem removes a item from the store
func (k Keeper) RemoveItem(ctx sdk.Context, id uint64) {
store := prefix.NewStore(ctx.KVStore(k.storeKey), types.KeyPrefix(types.ItemKey))
store.Delete(GetItemIDBytes(id))
}
// GetAllItem returns all item
func (k Keeper) GetAllItem(ctx sdk.Context) (list []types.Item) {
store := prefix.NewStore(ctx.KVStore(k.storeKey), types.KeyPrefix(types.ItemKey))
iterator := sdk.KVStorePrefixIterator(store, []byte{})
defer iterator.Close()
for ; iterator.Valid(); iterator.Next() {
var val types.Item
k.cdc.MustUnmarshal(iterator.Value(), &val)
list = append(list, val)
}
return
}
// GetItemIDBytes returns the byte representation of the ID
func GetItemIDBytes(id uint64) []byte {
bz := make([]byte, 8)
binary.BigEndian.PutUint64(bz, id)
return bz
}
// GetItemIDFromBytes returns ID in uint64 format from a byte array
func GetItemIDFromBytes(bz []byte) uint64 {
return binary.BigEndian.Uint64(bz)
}