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Transaction: cache transaction IDs

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Without caching, transactions are serialized way too often.

This effectively reverts b8d3c4a641, but
invalidation is slightly different.
This commit is contained in:
Andreas Schildbach 2025-02-10 01:36:20 +01:00
parent 2f7579d797
commit e57e21cc98
1 changed files with 59 additions and 16 deletions
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75
core/src/main/java/org/bitcoinj/core/Transaction.java
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@ -222,6 +222,10 @@ public class Transaction extends BaseMessage {
@Nullable
private String memo;
// These are in memory helpers only. They contain the transaction hashes without and with witness.
private Sha256Hash cachedTxId;
private Sha256Hash cachedWTxId;
/**
* Constructs an incomplete coinbase transaction with a minimal input script and no outputs.
*
@ -330,17 +334,26 @@ public class Transaction extends BaseMessage {
}
/**
* Returns the transaction id as you see them in block explorers. It is used as a reference by transaction inputs
* Returns the transaction ID as you see them in block explorers. It is used as a reference by transaction inputs
* via outpoints.
*
* @return transaction ID
*/
public Sha256Hash getTxId() {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
bitcoinSerializeToStream(baos, false);
} catch (IOException e) {
throw new RuntimeException(e); // cannot happen
if (cachedTxId == null) {
if (!hasWitnesses() && cachedWTxId != null) {
cachedTxId = cachedWTxId;
} else {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
bitcoinSerializeToStream(baos, false);
} catch (IOException e) {
throw new RuntimeException(e); // cannot happen
}
cachedTxId = Sha256Hash.wrapReversed(Sha256Hash.hashTwice(baos.toByteArray()));
}
}
return Sha256Hash.wrapReversed(Sha256Hash.hashTwice(baos.toByteArray()));
return cachedTxId;
}
/**
@ -352,17 +365,32 @@ public class Transaction extends BaseMessage {
}
/**
* Returns the witness transaction id (aka witness id) as per BIP144. For transactions without witness, this is the
* Returns the witness transaction ID (aka witness ID) as per BIP144. For transactions without witness, this is the
* same as {@link #getTxId()}.
*
* @return witness transaction ID
*/
public Sha256Hash getWTxId() {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
bitcoinSerializeToStream(baos, hasWitnesses());
} catch (IOException e) {
throw new RuntimeException(e); // cannot happen
if (cachedWTxId == null) {
if (!hasWitnesses() && cachedTxId != null) {
cachedWTxId = cachedTxId;
} else {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
bitcoinSerializeToStream(baos, hasWitnesses());
} catch (IOException e) {
throw new RuntimeException(e); // cannot happen
}
cachedWTxId = Sha256Hash.wrapReversed(Sha256Hash.hashTwice(baos.toByteArray()));
}
}
return Sha256Hash.wrapReversed(Sha256Hash.hashTwice(baos.toByteArray()));
return cachedWTxId;
}
/** invalidates cache for both transaction IDs */
private void invalidateCachedTxIds() {
cachedTxId = null;
cachedWTxId = null;
}
/** Gets the transaction weight as defined in BIP141. */
@ -643,6 +671,7 @@ public class Transaction extends BaseMessage {
for (long i = 0; i < numInputs; i++) {
inputs.add(TransactionInput.read(payload, this));
}
invalidateCachedTxIds();
}
private void readOutputs(ByteBuffer payload) throws BufferUnderflowException, ProtocolException {
@ -653,6 +682,7 @@ public class Transaction extends BaseMessage {
for (long i = 0; i < numOutputs; i++) {
outputs.add(TransactionOutput.read(payload, this));
}
invalidateCachedTxIds();
}
private void readWitnesses(ByteBuffer payload) throws BufferUnderflowException, ProtocolException {
@ -864,6 +894,7 @@ public class Transaction extends BaseMessage {
input.setParent(null);
}
inputs.clear();
invalidateCachedTxIds();
}
/**
@ -874,7 +905,9 @@ public class Transaction extends BaseMessage {
* @return the newly created input.
*/
public TransactionInput addInput(TransactionOutput from) {
return addInput(new TransactionInput(this, from));
TransactionInput input = addInput(new TransactionInput(this, from));
invalidateCachedTxIds();
return input;
}
/**
@ -884,6 +917,7 @@ public class Transaction extends BaseMessage {
public TransactionInput addInput(TransactionInput input) {
input.setParent(this);
inputs.add(input);
invalidateCachedTxIds();
return input;
}
@ -892,7 +926,10 @@ public class Transaction extends BaseMessage {
* @return the newly created input.
*/
public TransactionInput addInput(Sha256Hash spendTxHash, long outputIndex, Script script) {
return addInput(new TransactionInput(this, script.program(), new TransactionOutPoint(outputIndex, spendTxHash)));
TransactionInput input = addInput(new TransactionInput(this, script.program(),
new TransactionOutPoint(outputIndex, spendTxHash)));
invalidateCachedTxIds();
return input;
}
/**
@ -1029,6 +1066,7 @@ public class Transaction extends BaseMessage {
oldInput.setParent(null);
input.setParent(this);
inputs.add(index, input);
invalidateCachedTxIds();
}
/**
@ -1040,6 +1078,7 @@ public class Transaction extends BaseMessage {
output.setParent(null);
}
outputs.clear();
invalidateCachedTxIds();
}
/**
@ -1048,6 +1087,7 @@ public class Transaction extends BaseMessage {
public TransactionOutput addOutput(TransactionOutput to) {
to.setParent(this);
outputs.add(to);
invalidateCachedTxIds();
return to;
}
@ -1064,6 +1104,7 @@ public class Transaction extends BaseMessage {
oldOutput.setParent(null);
output.setParent(this);
outputs.add(index, output);
invalidateCachedTxIds();
}
/**
@ -1549,6 +1590,7 @@ public class Transaction extends BaseMessage {
log.warn("You are setting the lock time on a transaction but none of the inputs have non-default sequence numbers. This will not do what you expect!");
}
this.vLockTime = LockTime.of(lockTime);
invalidateCachedTxIds();
}
public long getVersion() {
@ -1557,6 +1599,7 @@ public class Transaction extends BaseMessage {
public void setVersion(int version) {
this.version = version;
invalidateCachedTxIds();
}
/** Returns an unmodifiable view of all inputs. */