100 lines
2.8 KiB
Go
100 lines
2.8 KiB
Go
package iavl
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import (
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"fmt"
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"github.com/cosmos/iavl"
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)
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var (
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_ Tree = (*immutableTree)(nil)
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_ Tree = (*iavl.MutableTree)(nil)
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)
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type (
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// Tree defines an interface that both mutable and immutable IAVL trees
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// must implement. For mutable IAVL trees, the interface is directly
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// implemented by an iavl.MutableTree. For an immutable IAVL tree, a wrapper
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// must be made.
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Tree interface {
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Has(key []byte) bool
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Get(key []byte) (index int64, value []byte)
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Set(key, value []byte) bool
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Remove(key []byte) ([]byte, bool)
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SaveVersion() ([]byte, int64, error)
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DeleteVersion(version int64) error
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DeleteVersions(versions ...int64) error
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Version() int64
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Hash() []byte
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VersionExists(version int64) bool
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GetVersioned(key []byte, version int64) (int64, []byte)
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GetVersionedWithProof(key []byte, version int64) ([]byte, *iavl.RangeProof, error)
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GetImmutable(version int64) (*iavl.ImmutableTree, error)
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SetInitialVersion(version uint64)
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AvailableVersions() []int
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}
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// immutableTree is a simple wrapper around a reference to an iavl.ImmutableTree
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// that implements the Tree interface. It should only be used for querying
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// and iteration, specifically at previous heights.
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immutableTree struct {
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*iavl.ImmutableTree
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}
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)
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func (it *immutableTree) Set(_, _ []byte) bool {
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panic("cannot call 'Set' on an immutable IAVL tree")
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}
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func (it *immutableTree) Remove(_ []byte) ([]byte, bool) {
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panic("cannot call 'Remove' on an immutable IAVL tree")
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}
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func (it *immutableTree) SaveVersion() ([]byte, int64, error) {
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panic("cannot call 'SaveVersion' on an immutable IAVL tree")
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}
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func (it *immutableTree) DeleteVersion(_ int64) error {
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panic("cannot call 'DeleteVersion' on an immutable IAVL tree")
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}
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func (it *immutableTree) DeleteVersions(_ ...int64) error {
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panic("cannot call 'DeleteVersions' on an immutable IAVL tree")
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}
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func (it *immutableTree) SetInitialVersion(_ uint64) {
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panic("cannot call 'SetInitialVersion' on an immutable IAVL tree")
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}
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func (it *immutableTree) VersionExists(version int64) bool {
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return it.Version() == version
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}
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func (it *immutableTree) GetVersioned(key []byte, version int64) (int64, []byte) {
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if it.Version() != version {
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return -1, nil
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}
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return it.Get(key)
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}
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func (it *immutableTree) GetVersionedWithProof(key []byte, version int64) ([]byte, *iavl.RangeProof, error) {
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if it.Version() != version {
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return nil, nil, fmt.Errorf("version mismatch on immutable IAVL tree; got: %d, expected: %d", version, it.Version())
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}
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return it.GetWithProof(key)
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}
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func (it *immutableTree) GetImmutable(version int64) (*iavl.ImmutableTree, error) {
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if it.Version() != version {
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return nil, fmt.Errorf("version mismatch on immutable IAVL tree; got: %d, expected: %d", version, it.Version())
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}
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return it.ImmutableTree, nil
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}
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func (it *immutableTree) AvailableVersions() []int {
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return []int{}
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}
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