-
Notifications
You must be signed in to change notification settings - Fork 176
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
1 changed file
with
163 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,163 @@ | ||
package state | ||
|
||
import ( | ||
"io" | ||
"os" | ||
"path/filepath" | ||
|
||
"github.com/onflow/atree" | ||
gethCommon "github.com/onflow/go-ethereum/common" | ||
|
||
"github.com/onflow/flow-go/model/flow" | ||
) | ||
|
||
const ( | ||
ExportedAccountsFileName = "accounts.bin" | ||
ExportedCodesFileName = "codes.bin" | ||
ExportedSlotsFileName = "slots.bin" | ||
) | ||
|
||
type Exporter struct { | ||
ledger atree.Ledger | ||
root flow.Address | ||
baseView *BaseView | ||
} | ||
|
||
// NewExporter constructs a new Exporter | ||
func NewExporter(ledger atree.Ledger, root flow.Address) (*Exporter, error) { | ||
bv, err := NewBaseView(ledger, root) | ||
if err != nil { | ||
return nil, err | ||
} | ||
return &Exporter{ | ||
ledger: ledger, | ||
root: root, | ||
baseView: bv, | ||
}, nil | ||
} | ||
|
||
func (e *Exporter) Export(path string) error { | ||
af, err := os.OpenFile(filepath.Join(path, ExportedAccountsFileName), os.O_RDWR, 0644) | ||
if err != nil { | ||
return err | ||
} | ||
defer af.Close() | ||
|
||
addrWithStorage, err := e.exportAccounts(af) | ||
if err != nil { | ||
return err | ||
} | ||
|
||
cf, err := os.OpenFile(filepath.Join(path, ExportedCodesFileName), os.O_RDWR, 0644) | ||
if err != nil { | ||
return err | ||
} | ||
defer cf.Close() | ||
|
||
err = e.exportCodes(cf) | ||
if err != nil { | ||
return err | ||
} | ||
|
||
sf, err := os.OpenFile(filepath.Join(path, ExportedSlotsFileName), os.O_RDWR, 0644) | ||
if err != nil { | ||
return err | ||
} | ||
defer cf.Close() | ||
|
||
err = e.exportSlots(addrWithStorage, sf) | ||
if err != nil { | ||
return err | ||
} | ||
return nil | ||
} | ||
|
||
// exports accounts and returns a list of addresses with non-empty storage | ||
func (e *Exporter) exportAccounts(writer io.Writer) ([]gethCommon.Address, error) { | ||
itr, err := e.baseView.AccountIterator() | ||
if err != nil { | ||
return nil, err | ||
} | ||
// make a list of accounts with storage | ||
addrWithSlots := make([]gethCommon.Address, 0) | ||
for { | ||
// TODO: we can optimize by returning the encoded value | ||
acc, err := itr.Next() | ||
if err != nil { | ||
return nil, err | ||
} | ||
if acc == nil { | ||
break | ||
} | ||
if acc.HasStoredValues() { | ||
addrWithSlots = append(addrWithSlots, acc.Address) | ||
} | ||
encoded, err := acc.Encode() | ||
if err != nil { | ||
return nil, err | ||
} | ||
// write every account on a new line | ||
_, err = writer.Write(append(encoded, byte('\n'))) | ||
if err != nil { | ||
return nil, err | ||
} | ||
} | ||
return addrWithSlots, nil | ||
} | ||
|
||
// exportCodes exports codes | ||
func (e *Exporter) exportCodes(writer io.Writer) error { | ||
itr, err := e.baseView.CodeIterator() | ||
if err != nil { | ||
return err | ||
} | ||
for { | ||
cic, err := itr.Next() | ||
if err != nil { | ||
return err | ||
} | ||
if cic == nil { | ||
break | ||
} | ||
encoded, err := cic.Encode() | ||
if err != nil { | ||
return err | ||
} | ||
// write every codes on a new line | ||
_, err = writer.Write(append(encoded, byte('\n'))) | ||
if err != nil { | ||
return err | ||
} | ||
} | ||
return nil | ||
} | ||
|
||
// exportSlots exports slots (key value pairs stored under accounts) | ||
func (e *Exporter) exportSlots(addresses []gethCommon.Address, writer io.Writer) error { | ||
for _, addr := range addresses { | ||
itr, err := e.baseView.AccountStorageIterator(addr) | ||
if err != nil { | ||
return err | ||
} | ||
for { | ||
slot, err := itr.Next() | ||
if err != nil { | ||
return err | ||
} | ||
if slot == nil { | ||
break | ||
} | ||
encoded, err := slot.Encode() | ||
if err != nil { | ||
return err | ||
} | ||
// write every codes on a new line | ||
_, err = writer.Write(append(encoded, byte('\n'))) | ||
if err != nil { | ||
return err | ||
} | ||
} | ||
} | ||
|
||
return nil | ||
} |