52 lines
1.8 KiB
Go
52 lines
1.8 KiB
Go
package feegrant
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import (
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sdk "github.com/cosmos/cosmos-sdk/types"
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"github.com/cosmos/cosmos-sdk/types/address"
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"github.com/cosmos/cosmos-sdk/types/kv"
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)
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const (
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// ModuleName is the module name constant used in many places
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ModuleName = "feegrant"
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// StoreKey is the store key string for supply
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StoreKey = ModuleName
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// RouterKey is the message route for supply
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RouterKey = ModuleName
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// QuerierRoute is the querier route for supply
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QuerierRoute = ModuleName
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)
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var (
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// FeeAllowanceKeyPrefix is the set of the kvstore for fee allowance data
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FeeAllowanceKeyPrefix = []byte{0x00}
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)
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// FeeAllowanceKey is the canonical key to store a grant from granter to grantee
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// We store by grantee first to allow searching by everyone who granted to you
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func FeeAllowanceKey(granter sdk.AccAddress, grantee sdk.AccAddress) []byte {
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return append(FeeAllowancePrefixByGrantee(grantee), address.MustLengthPrefix(granter.Bytes())...)
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}
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// FeeAllowancePrefixByGrantee returns a prefix to scan for all grants to this given address.
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func FeeAllowancePrefixByGrantee(grantee sdk.AccAddress) []byte {
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return append(FeeAllowanceKeyPrefix, address.MustLengthPrefix(grantee.Bytes())...)
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}
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func ParseAddressesFromFeeAllowanceKey(key []byte) (granter, grantee sdk.AccAddress) {
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// key is of format:
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// 0x00<granteeAddressLen (1 Byte)><granteeAddress_Bytes><granterAddressLen (1 Byte)><granterAddress_Bytes><msgType_Bytes>
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kv.AssertKeyAtLeastLength(key, 2)
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granteeAddrLen := key[1] // remove prefix key
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kv.AssertKeyAtLeastLength(key, int(2+granteeAddrLen))
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grantee = sdk.AccAddress(key[2 : 2+granteeAddrLen])
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granterAddrLen := int(key[2+granteeAddrLen])
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kv.AssertKeyAtLeastLength(key, 3+int(granteeAddrLen+byte(granterAddrLen)))
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granter = sdk.AccAddress(key[3+granterAddrLen : 3+granteeAddrLen+byte(granterAddrLen)])
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return granter, grantee
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}
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