97 lines
3.9 KiB
Go
97 lines
3.9 KiB
Go
package feegrant
|
|
|
|
import (
|
|
time "time"
|
|
|
|
sdk "github.com/cosmos/cosmos-sdk/types"
|
|
"github.com/cosmos/cosmos-sdk/types/address"
|
|
)
|
|
|
|
const (
|
|
// ModuleName is the module name constant used in many places
|
|
ModuleName = "feegrant"
|
|
|
|
// StoreKey is the store key string for supply
|
|
StoreKey = ModuleName
|
|
|
|
// RouterKey is the message route for supply
|
|
RouterKey = ModuleName
|
|
|
|
// QuerierRoute is the querier route for supply
|
|
QuerierRoute = ModuleName
|
|
)
|
|
|
|
var (
|
|
// FeeAllowanceKeyPrefix is the set of the kvstore for fee allowance data
|
|
// - 0x00<allowance_key_bytes>: allowance
|
|
FeeAllowanceKeyPrefix = []byte{0x00}
|
|
|
|
// FeeAllowanceQueueKeyPrefix is the set of the kvstore for fee allowance keys data
|
|
// - 0x01<allowance_prefix_queue_key_bytes>: <empty value>
|
|
FeeAllowanceQueueKeyPrefix = []byte{0x01}
|
|
)
|
|
|
|
// FeeAllowanceKey is the canonical key to store a grant from granter to grantee
|
|
// We store by grantee first to allow searching by everyone who granted to you
|
|
//
|
|
// Key format:
|
|
// - <0x00><len(grantee_address_bytes)><grantee_address_bytes><len(granter_address_bytes)><granter_address_bytes>
|
|
func FeeAllowanceKey(granter sdk.AccAddress, grantee sdk.AccAddress) []byte {
|
|
return append(FeeAllowancePrefixByGrantee(grantee), address.MustLengthPrefix(granter.Bytes())...)
|
|
}
|
|
|
|
// FeeAllowancePrefixByGrantee returns a prefix to scan for all grants to this given address.
|
|
//
|
|
// Key format:
|
|
// - <0x00><len(grantee_address_bytes)><grantee_address_bytes>
|
|
func FeeAllowancePrefixByGrantee(grantee sdk.AccAddress) []byte {
|
|
return append(FeeAllowanceKeyPrefix, address.MustLengthPrefix(grantee.Bytes())...)
|
|
}
|
|
|
|
// FeeAllowancePrefixQueue is the canonical key to store grant key.
|
|
//
|
|
// Key format:
|
|
// - <0x01><exp_bytes><len(grantee_address_bytes)><grantee_address_bytes><len(granter_address_bytes)><granter_address_bytes>
|
|
func FeeAllowancePrefixQueue(exp *time.Time, key []byte) []byte {
|
|
allowanceByExpTimeKey := AllowanceByExpTimeKey(exp)
|
|
return append(allowanceByExpTimeKey, key...)
|
|
}
|
|
|
|
// AllowanceByExpTimeKey returns a key with `FeeAllowanceQueueKeyPrefix`, expiry
|
|
//
|
|
// Key format:
|
|
// - <0x01><exp_bytes>
|
|
func AllowanceByExpTimeKey(exp *time.Time) []byte {
|
|
// no need of appending len(exp_bytes) here, `FormatTimeBytes` gives const length everytime.
|
|
return append(FeeAllowanceQueueKeyPrefix, sdk.FormatTimeBytes(*exp)...)
|
|
}
|
|
|
|
// ParseAddressesFromFeeAllowanceKey extracts and returns the granter, grantee from the given key.
|
|
func ParseAddressesFromFeeAllowanceKey(key []byte) (granter, grantee sdk.AccAddress) {
|
|
|
|
// key is of format:
|
|
// 0x00<granteeAddressLen (1 Byte)><granteeAddress_Bytes><granterAddressLen (1 Byte)><granterAddress_Bytes>
|
|
granterAddrLen, granterAddrLenEndIndex := sdk.ParseLengthPrefixedBytes(key, 1, 1) // ignore key[0] since it is a prefix key
|
|
grantee, granterAddrEndIndex := sdk.ParseLengthPrefixedBytes(key, granterAddrLenEndIndex+1, int(granterAddrLen[0]))
|
|
|
|
granteeAddrLen, granteeAddrLenEndIndex := sdk.ParseLengthPrefixedBytes(key, granterAddrEndIndex+1, 1)
|
|
granter, _ = sdk.ParseLengthPrefixedBytes(key, granteeAddrLenEndIndex+1, int(granteeAddrLen[0]))
|
|
|
|
return granter, grantee
|
|
}
|
|
|
|
// ParseAddressesFromFeeAllowanceQueueKey extracts and returns the granter, grantee from the given key.
|
|
func ParseAddressesFromFeeAllowanceQueueKey(key []byte) (granter, grantee sdk.AccAddress) {
|
|
var lenTime = len(sdk.FormatTimeBytes(time.Now()))
|
|
|
|
// key is of format:
|
|
// <0x01><expiration_bytes(fixed length)><granteeAddressLen (1 Byte)><granteeAddress_Bytes><granterAddressLen (1 Byte)><granterAddress_Bytes>
|
|
granterAddrLen, granterAddrLenEndIndex := sdk.ParseLengthPrefixedBytes(key, 1+lenTime, 1) // ignore key[0] since it is a prefix key
|
|
grantee, granterAddrEndIndex := sdk.ParseLengthPrefixedBytes(key, granterAddrLenEndIndex+1, int(granterAddrLen[0]))
|
|
|
|
granteeAddrLen, granteeAddrLenEndIndex := sdk.ParseLengthPrefixedBytes(key, granterAddrEndIndex+1, 1)
|
|
granter, _ = sdk.ParseLengthPrefixedBytes(key, granteeAddrLenEndIndex+1, int(granteeAddrLen[0]))
|
|
|
|
return granter, grantee
|
|
}
|