48 lines
1.8 KiB
Go
48 lines
1.8 KiB
Go
package v046
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import (
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"time"
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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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)
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var (
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ModuleName = "feegrant"
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// FeeAllowanceKeyPrefix is the set of the kvstore for fee allowance data
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// - 0x00<allowance_key_bytes>: allowance
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FeeAllowanceKeyPrefix = []byte{0x00}
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// FeeAllowanceQueueKeyPrefix is the set of the kvstore for fee allowance keys data
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// - 0x01<allowance_prefix_queue_key_bytes>: <empty value>
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FeeAllowanceQueueKeyPrefix = []byte{0x01}
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)
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// FeeAllowancePrefixQueue is the canonical key to store grant key.
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//
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// Key format:
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// - <0x01><exp_bytes><len(grantee_address_bytes)><grantee_address_bytes><len(granter_address_bytes)><granter_address_bytes>
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func FeeAllowancePrefixQueue(exp *time.Time, key []byte) []byte {
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// no need of appending len(exp_bytes) here, `FormatTimeBytes` gives const length everytime.
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allowanceByExpTimeKey := append(FeeAllowanceQueueKeyPrefix, sdk.FormatTimeBytes(*exp)...)
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return append(allowanceByExpTimeKey, key...)
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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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//
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// Key format:
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// - <0x00><len(grantee_address_bytes)><grantee_address_bytes><len(granter_address_bytes)><granter_address_bytes>
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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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//
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// Key format:
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// - <0x00><len(grantee_address_bytes)><grantee_address_bytes>
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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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