70 lines
2.1 KiB
Go
70 lines
2.1 KiB
Go
package types
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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 defines the module name
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ModuleName = "bank"
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// StoreKey defines the primary module store key
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StoreKey = ModuleName
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// RouterKey defines the module's message routing key
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RouterKey = ModuleName
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// QuerierRoute defines the module's query routing key
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QuerierRoute = ModuleName
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)
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// KVStore keys
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var (
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SupplyKey = []byte{0x00}
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DenomMetadataPrefix = []byte{0x1}
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DenomAddressPrefix = []byte{0x03}
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// BalancesPrefix is the prefix for the account balances store. We use a byte
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// (instead of `[]byte("balances")` to save some disk space).
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BalancesPrefix = []byte{0x02}
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)
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// AddressAndDenomFromBalancesStore returns an account address and denom from a balances prefix
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// store. The key must not contain the prefix BalancesPrefix as the prefix store
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// iterator discards the actual prefix.
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//
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// If invalid key is passed, AddressAndDenomFromBalancesStore returns ErrInvalidKey.
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func AddressAndDenomFromBalancesStore(key []byte) (sdk.AccAddress, string, error) {
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if len(key) == 0 {
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return nil, "", ErrInvalidKey
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}
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kv.AssertKeyAtLeastLength(key, 1)
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addrBound := int(key[0])
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if len(key)-1 < addrBound {
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return nil, "", ErrInvalidKey
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}
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return key[1 : addrBound+1], string(key[addrBound+1:]), nil
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}
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// CreateAccountBalancesPrefix creates the prefix for an account's balances.
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func CreateAccountBalancesPrefix(addr []byte) []byte {
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return append(BalancesPrefix, address.MustLengthPrefix(addr)...)
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}
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// CreateDenomAddressPrefix creates a prefix for a reverse index of denomination
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// to account balance for that denomination.
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func CreateDenomAddressPrefix(denom string) []byte {
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// we add a "zero" byte at the end - null byte terminator, to allow prefix denom prefix
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// scan. Setting it is not needed (key[last] = 0) - because this is the default.
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key := make([]byte, len(DenomAddressPrefix)+len(denom)+1)
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copy(key, DenomAddressPrefix)
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copy(key[len(DenomAddressPrefix):], denom)
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return key
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}
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