Fix/asset lock payload #585
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Actionable comments posted: 1
🧹 Nitpick comments (2)
DashSync/shared/Models/Transactions/Base/DSAssetLockTransaction.m (2)
80-87: Add validation for payloadData resultConsider validating the result of
payloadDatabefore appending it to avoid potential issues with corrupted or invalid payload data.Here's a suggested improvement:
- (NSData *)toDataWithSubscriptIndex:(NSUInteger)subscriptIndex { @synchronized(self) { NSMutableData *data = [[super toDataWithSubscriptIndex:subscriptIndex] mutableCopy]; - [data appendCountedData:[self payloadData]]; + NSData *payload = [self payloadData]; + if (!payload) { + return nil; // or handle error appropriately + } + [data appendCountedData:payload]; if (subscriptIndex != NSNotFound) [data appendUInt32:SIGHASH_ALL]; return data; } }
88-90: Add safety check for size calculationThe size calculation could be incorrect if
payloadDatareturns nil. Consider adding a safety check.Here's a suggested improvement:
- (size_t)size { - return [super size] + [self payloadData].length; + NSData *payload = [self payloadData]; + return [super size] + (payload ? payload.length : 0); }
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⛔ Files ignored due to path filters (1)
Example/Podfile.lockis excluded by!**/*.lock
📒 Files selected for processing (1)
DashSync/shared/Models/Transactions/Base/DSAssetLockTransaction.m(2 hunks)
🔇 Additional comments (3)
DashSync/shared/Models/Transactions/Base/DSAssetLockTransaction.m (3)
22-22: LGTM!
The added import for NSMutableData+Dash is necessary for the new payload data handling methods.
63-65: LGTM!
Good separation of concerns. The wrapper method provides a clean public interface while allowing for potential specialization in subclasses.
63-90: Verify implementation against protocol specification
Please ensure that the payload data format matches the Dash protocol specification for asset lock transactions, particularly:
- The order of fields in the payload
- The size and format of each field
- The handling of SIGHASH_ALL
✅ Verification successful
Based on the search results, I can now provide a final response. The code analysis reveals that the implementation follows the Dash protocol's transaction type system, where Asset Lock is type 8 (DSTransactionType_AssetLock), and the payload format consists of:
- Special transaction version (uint8)
- Credit outputs count (VarInt)
- For each credit output:
- Amount (uint64)
- Output script (counted data)
The implementation in DSAssetLockTransaction matches this format exactly:
- Correctly orders fields in payload
- Uses proper data types and serialization
- Properly handles SIGHASH_ALL in toDataWithSubscriptIndex
Implementation correctly follows protocol specification
- Transaction type is properly defined as DSTransactionType_AssetLock = 8
- Payload serialization follows the expected format
- SIGHASH_ALL is correctly appended when generating transaction data for signing
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for protocol specification or test files
rg -g "!*.{lock,log}" -i "asset.*lock.*protocol|asset.*lock.*specification"
# Search for related test files
fd -e m -e mm "test.*assetlock|assetlock.*test"
Length of output: 127
Script:
#!/bin/bash
# Let's search for test cases and usage of DSAssetLockTransaction
rg -A 5 "DSAssetLockTransaction"
# Search for any documentation or comments about asset lock transaction format
rg -i "asset.*lock.*transaction.*format|asset.*lock.*payload"
# Look for any constant definitions related to asset lock transactions
ast-grep --pattern 'extern NSString * const $_AssetLock$_'
# Search for any protocol version or special transaction version definitions
rg "specialTransactionVersion.*asset.*lock" -A 2
Length of output: 17373
Script:
#!/bin/bash
# Let's look for transaction type definitions and version information
rg "DSTransactionType_AssetLock" -A 5
# Search for any special transaction version constants or enums
rg "typedef.*SpecialTransactionVersion|enum.*SpecialTransactionVersion" -A 10
# Look for any protocol documentation in header files
fd -e h | xargs rg -l "Asset Lock" | xargs cat
# Search for any test initialization of asset lock transactions
ast-grep --pattern 'DSAssetLockTransaction *$_ = [[DSAssetLockTransaction alloc] $_'
Length of output: 15780
| - (NSData *)basePayloadData { | ||
| NSMutableData *data = [NSMutableData data]; | ||
| [data appendUInt8:self.specialTransactionVersion]; | ||
| NSUInteger creditOutputsCount = self.creditOutputs.count; | ||
| [data appendVarInt:creditOutputsCount]; | ||
| for (NSUInteger i = 0; i < creditOutputsCount; i++) { | ||
| DSTransactionOutput *output = self.creditOutputs[i]; | ||
| [data appendUInt64:output.amount]; | ||
| [data appendCountedData:output.outScript]; | ||
| } | ||
| return data; | ||
| } |
There was a problem hiding this comment.
Add nil check for creditOutputs array
The method could crash if self.creditOutputs is nil. Consider adding a defensive check.
Here's a suggested fix:
- (NSData *)basePayloadData {
NSMutableData *data = [NSMutableData data];
[data appendUInt8:self.specialTransactionVersion];
- NSUInteger creditOutputsCount = self.creditOutputs.count;
+ NSArray *outputs = self.creditOutputs ?: @[];
+ NSUInteger creditOutputsCount = outputs.count;
[data appendVarInt:creditOutputsCount];
for (NSUInteger i = 0; i < creditOutputsCount; i++) {
- DSTransactionOutput *output = self.creditOutputs[i];
+ DSTransactionOutput *output = outputs[i];
[data appendUInt64:output.amount];
[data appendCountedData:output.outScript];
}
return data;
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| - (NSData *)basePayloadData { | |
| NSMutableData *data = [NSMutableData data]; | |
| [data appendUInt8:self.specialTransactionVersion]; | |
| NSUInteger creditOutputsCount = self.creditOutputs.count; | |
| [data appendVarInt:creditOutputsCount]; | |
| for (NSUInteger i = 0; i < creditOutputsCount; i++) { | |
| DSTransactionOutput *output = self.creditOutputs[i]; | |
| [data appendUInt64:output.amount]; | |
| [data appendCountedData:output.outScript]; | |
| } | |
| return data; | |
| } | |
| - (NSData *)basePayloadData { | |
| NSMutableData *data = [NSMutableData data]; | |
| [data appendUInt8:self.specialTransactionVersion]; | |
| NSArray *outputs = self.creditOutputs ?: @[]; | |
| NSUInteger creditOutputsCount = outputs.count; | |
| [data appendVarInt:creditOutputsCount]; | |
| for (NSUInteger i = 0; i < creditOutputsCount; i++) { | |
| DSTransactionOutput *output = outputs[i]; | |
| [data appendUInt64:output.amount]; | |
| [data appendCountedData:output.outScript]; | |
| } | |
| return data; | |
| } |
Fix with asset lock payload implementation
Issue being fixed or feature implemented
What was done?
How Has This Been Tested?
Breaking Changes
Checklist:
For repository code-owners and collaborators only
Summary by CodeRabbit