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keeper.go
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keeper.go
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package keeper
import (
"fmt"
"github.com/cosmos/cosmos-sdk/codec"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/tendermint/tendermint/libs/log"
"github.com/elesto-dao/elesto/v4/x/credential"
)
// UnmarshalFn is a generic function to unmarshal bytes
type UnmarshalFn func(value []byte) (interface{}, bool)
// MarshalFn is a generic function to marshal bytes
type MarshalFn func(o codec.ProtoMarshaler) []byte
type Keeper struct {
cdc codec.Codec
storeKey sdk.StoreKey
memKey sdk.StoreKey
did credential.DidKeeper
account credential.AccountKeeper
}
func NewKeeper(cdc codec.Codec, storeKey, memKey sdk.StoreKey, did credential.DidKeeper, account credential.AccountKeeper) *Keeper {
return &Keeper{
cdc: cdc,
storeKey: storeKey,
memKey: memKey,
did: did,
account: account,
}
}
func (k Keeper) Logger(ctx sdk.Context) log.Logger {
return ctx.Logger().With("module", fmt.Sprintf("x/%s", credential.ModuleName))
}
// Set sets a value in the db with a prefixed key
func (k Keeper) Set(ctx sdk.Context,
prefix []byte,
key []byte,
i codec.ProtoMarshaler,
marshal MarshalFn,
) {
store := ctx.KVStore(k.storeKey)
store.Set(append(prefix, key...), marshal(i))
}
// Get gets an item from the store by bytes
func (k Keeper) Get(
ctx sdk.Context,
prefix []byte,
key []byte,
unmarshal UnmarshalFn,
) (i interface{}, found bool) {
store := ctx.KVStore(k.storeKey)
value := store.Get(append(prefix, key...))
return unmarshal(value)
}
// GetAll values from with a prefix from the store
func (k Keeper) GetAll(
ctx sdk.Context,
prefix []byte,
) sdk.Iterator {
store := ctx.KVStore(k.storeKey)
return sdk.KVStorePrefixIterator(store, prefix)
}
func (k Keeper) Exists(
ctx sdk.Context,
prefix []byte,
key []byte,
) bool {
store := ctx.KVStore(k.storeKey)
bz := store.Get(append(prefix, key...))
return bz != nil
}