feat: implement asynchronous processing for coinbase chainlocks #6947
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- Added methods to queue and process coinbase chainlocks in CChainLocksHandler. - Introduced a deque to hold pending chainlocks for asynchronous processing. - Updated the Start method to call ProcessPendingCoinbaseChainLocks. - Added unit tests to verify the queueing mechanism for coinbase chainlocks. This enhancement allows for improved handling of chainlocks during block validation without blocking the main processing flow.
✅ No Merge Conflicts DetectedThis PR currently has no conflicts with other open PRs. |
src/test/llmq_chainlock_tests.cpp
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| } | ||
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| BOOST_AUTO_TEST_CASE(coinbase_chainlock_queueing_test) |
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kinda useless test; but I guess fine? Open to thoughts
WalkthroughThis pull request introduces asynchronous queuing and processing of coinbase chainlocks. New methods Sequence DiagramsequenceDiagram
participant Caller
participant CChainLocksHandler
participant Queue as pendingCoinbaseChainLocks
participant Processor as ProcessPendingCoinbaseChainLocks
Caller->>CChainLocksHandler: QueueCoinbaseChainLock(clsig)
rect rgb(200, 220, 240)
note over CChainLocksHandler: Enabled & Newer & Not Seen
CChainLocksHandler->>Queue: enqueue(clsig)
end
Note over CChainLocksHandler: Start() loop cycle
CChainLocksHandler->>Processor: ProcessPendingCoinbaseChainLocks()
rect rgb(220, 240, 200)
note over Processor: Swap queue (unlock cs early)
Processor->>Processor: Deduplicate against current state
loop for each clsig (reversed, newest first)
alt Not seen & Current
Processor->>CChainLocksHandler: ProcessNewChainLock(-1, clsig, hash)
else skip
Processor-->>Processor: skip outdated
end
end
end
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes
Pre-merge checks and finishing touches❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
✨ Finishing touches
🧪 Generate unit tests (beta)
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🧰 Additional context used📓 Path-based instructions (2)src/**/*.{cpp,h,cc,cxx,hpp}📄 CodeRabbit inference engine (CLAUDE.md)
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🧠 Learnings (5)📓 Common learnings📚 Learning: 2025-07-29T14:32:48.369ZApplied to files:
📚 Learning: 2025-08-19T14:57:31.801ZApplied to files:
📚 Learning: 2025-02-06T14:34:30.466ZApplied to files:
📚 Learning: 2025-10-21T11:09:34.688ZApplied to files:
🧬 Code graph analysis (3)src/chainlock/chainlock.cpp (1)
src/chainlock/chainlock.h (2)
test/functional/feature_llmq_chainlocks.py (2)
🔇 Additional comments (1)
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Actionable comments posted: 3
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📒 Files selected for processing (7)
src/chainlock/chainlock.cpp(3 hunks)src/chainlock/chainlock.h(3 hunks)src/evo/chainhelper.cpp(1 hunks)src/evo/chainhelper.h(2 hunks)src/evo/specialtxman.cpp(1 hunks)src/evo/specialtxman.h(1 hunks)src/test/llmq_chainlock_tests.cpp(2 hunks)
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src/**/*.{cpp,h,cc,cxx,hpp}
📄 CodeRabbit inference engine (CLAUDE.md)
src/**/*.{cpp,h,cc,cxx,hpp}: Dash Core C++ codebase must be written in C++20 and require at least Clang 16 or GCC 11.1
Dash uses unordered_lru_cache for efficient caching with LRU eviction
Files:
src/evo/specialtxman.hsrc/chainlock/chainlock.cppsrc/evo/chainhelper.hsrc/evo/chainhelper.cppsrc/evo/specialtxman.cppsrc/test/llmq_chainlock_tests.cppsrc/chainlock/chainlock.h
src/{masternode,evo}/**/*.{cpp,h,cc,cxx,hpp}
📄 CodeRabbit inference engine (CLAUDE.md)
Masternode lists must use immutable data structures (Immer library) for thread safety
Files:
src/evo/specialtxman.hsrc/evo/chainhelper.hsrc/evo/chainhelper.cppsrc/evo/specialtxman.cpp
src/{test,wallet/test,qt/test}/**/*.{cpp,h,cc,cxx,hpp}
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Unit tests for C++ code should be placed in src/test/, src/wallet/test/, or src/qt/test/ and use Boost::Test or Qt 5 for GUI tests
Files:
src/test/llmq_chainlock_tests.cpp
🧠 Learnings (8)
📓 Common learnings
Learnt from: kwvg
Repo: dashpay/dash PR: 6761
File: src/chainlock/signing.cpp:247-250
Timestamp: 2025-07-29T14:32:48.369Z
Learning: In PR #6761, kwvg acknowledged a null pointer check issue in ChainLockSigner::Cleanup() method but deferred it to follow-up, consistent with the pattern of avoiding scope creep in refactoring PRs.
Learnt from: kwvg
Repo: dashpay/dash PR: 6543
File: src/wallet/receive.cpp:240-251
Timestamp: 2025-02-06T14:34:30.466Z
Learning: Pull request #6543 is focused on move-only changes and refactoring, specifically backporting from Bitcoin. Behavior changes should be proposed in separate PRs.
Learnt from: knst
Repo: dashpay/dash PR: 6692
File: src/llmq/blockprocessor.cpp:217-224
Timestamp: 2025-08-19T14:57:31.801Z
Learning: In PR #6692, knst acknowledged a null pointer dereference issue in ProcessBlock() method where LookupBlockIndex may return nullptr but is passed to gsl::not_null, and created follow-up PR #6789 to address it, consistent with avoiding scope creep in performance-focused PRs.
📚 Learning: 2025-07-20T18:42:49.794Z
Learnt from: CR
Repo: dashpay/dash PR: 0
File: CLAUDE.md:0-0
Timestamp: 2025-07-20T18:42:49.794Z
Learning: Applies to src/evo/specialtx.h : Special transactions use payload extensions defined in src/evo/specialtx.h
Applied to files:
src/evo/specialtxman.hsrc/evo/specialtxman.cpp
📚 Learning: 2025-07-29T14:32:48.369Z
Learnt from: kwvg
Repo: dashpay/dash PR: 6761
File: src/chainlock/signing.cpp:247-250
Timestamp: 2025-07-29T14:32:48.369Z
Learning: In PR #6761, kwvg acknowledged a null pointer check issue in ChainLockSigner::Cleanup() method but deferred it to follow-up, consistent with the pattern of avoiding scope creep in refactoring PRs.
Applied to files:
src/chainlock/chainlock.cppsrc/evo/specialtxman.cppsrc/chainlock/chainlock.h
📚 Learning: 2025-01-02T21:50:00.967Z
Learnt from: kwvg
Repo: dashpay/dash PR: 6504
File: src/llmq/context.cpp:42-43
Timestamp: 2025-01-02T21:50:00.967Z
Learning: LLMQContext manages concurrency for the `CInstantSendManager`. Previously, this was handled globally; now it's handled as a class member in `LLMQContext`, but the concurrency control remains consistent.
Applied to files:
src/evo/chainhelper.h
📚 Learning: 2025-10-02T18:29:54.756Z
Learnt from: kwvg
Repo: dashpay/dash PR: 6840
File: src/net_processing.cpp:2882-2886
Timestamp: 2025-10-02T18:29:54.756Z
Learning: Across net_processing.cpp, once LLMQContext (m_llmq_ctx) is asserted non-null, its subcomponents (e.g., isman, qdkgsman, quorum_block_processor) are treated as initialized and used without extra null checks.
Applied to files:
src/evo/chainhelper.cpp
📚 Learning: 2024-12-29T17:43:41.755Z
Learnt from: kwvg
Repo: dashpay/dash PR: 6504
File: src/llmq/quorums.cpp:224-224
Timestamp: 2024-12-29T17:43:41.755Z
Learning: The `CQuorumManager` is fully initialized by `LLMQContext`, addressing any concerns about the manager’s initialization sequence.
Applied to files:
src/evo/chainhelper.cpp
📚 Learning: 2025-07-20T18:42:49.794Z
Learnt from: CR
Repo: dashpay/dash PR: 0
File: CLAUDE.md:0-0
Timestamp: 2025-07-20T18:42:49.794Z
Learning: Applies to src/{test,wallet/test,qt/test}/**/*.{cpp,h,cc,cxx,hpp} : Unit tests for C++ code should be placed in src/test/, src/wallet/test/, or src/qt/test/ and use Boost::Test or Qt 5 for GUI tests
Applied to files:
src/test/llmq_chainlock_tests.cpp
📚 Learning: 2025-10-21T11:09:34.688Z
Learnt from: kwvg
Repo: dashpay/dash PR: 6849
File: src/governance/governance.cpp:1339-1343
Timestamp: 2025-10-21T11:09:34.688Z
Learning: In the Dash Core codebase, `CacheMap` (defined in src/cachemap.h) is internally thread-safe and uses its own `mutable CCriticalSection cs` to protect access to its members. Methods like `GetSize()`, `Insert()`, `Get()`, `HasKey()`, etc., can be called without holding external locks.
Applied to files:
src/chainlock/chainlock.h
🧬 Code graph analysis (5)
src/evo/specialtxman.h (1)
src/chainlock/chainlock.cpp (2)
CChainLocksHandler(48-59)CChainLocksHandler(61-65)
src/chainlock/chainlock.cpp (1)
src/chainlock/chainlock.h (2)
cs(64-146)cs(65-143)
src/evo/chainhelper.h (1)
src/chainlock/chainlock.cpp (2)
CChainLocksHandler(48-59)CChainLocksHandler(61-65)
src/test/llmq_chainlock_tests.cpp (2)
src/node/interfaces.cpp (8)
height(563-573)height(563-563)height(878-885)height(878-878)height(886-892)height(886-886)height(937-941)height(937-937)src/test/util/llmq_tests.h (1)
GetTestBlockHash(109-109)
src/chainlock/chainlock.h (2)
src/chainlock/clsig.h (1)
chainlock(15-38)src/chainlock/chainlock.cpp (6)
QueueCoinbaseChainLock(497-518)QueueCoinbaseChainLock(497-497)Cleanup(442-495)Cleanup(442-442)ProcessPendingCoinbaseChainLocks(520-563)ProcessPendingCoinbaseChainLocks(520-520)
🪛 GitHub Actions: Clang Diff Format Check
src/chainlock/chainlock.cpp
[error] 1-1: Clang format differences found in src/chainlock/chainlock.cpp. Run the clang-format-diff.py script to apply formatting changes.
src/evo/specialtxman.cpp
[error] 1-1: Clang format differences found in src/evo/specialtxman.cpp. Run the clang-format-diff.py script to apply formatting changes.
src/test/llmq_chainlock_tests.cpp
[error] 1-1: Clang format differences found in src/test/llmq_chainlock_tests.cpp. Run the clang-format-diff.py script to apply formatting changes.
src/chainlock/chainlock.h
[error] 1-1: Clang format differences found in src/chainlock/chainlock.h. Run the clang-format-diff.py script to apply formatting changes.
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🔇 Additional comments (9)
src/evo/specialtxman.h (1)
48-48: LGTM: const-to-non-const change enables queueing.The change from
const llmq::CChainLocksHandler&tollmq::CChainLocksHandler&is necessary to support the newQueueCoinbaseChainLockmutating operation introduced in this PR. The member declaration, constructor parameter, and initialization are all consistent.Also applies to: 55-55, 63-63
src/chainlock/chainlock.h (3)
23-23: LGTM: Include added for new deque member.The
<deque>include is necessary for thependingCoinbaseChainLocksmember.
73-74: LGTM: Properly guarded queue member.The
pendingCoinbaseChainLocksdeque is correctly protected by the existingcsmutex, maintaining thread safety.
133-142: Fix clang-format differences and approve API design.The new public
QueueCoinbaseChainLockand privateProcessPendingCoinbaseChainLocksmethods have correct lock annotations (EXCLUSIVE_LOCKS_REQUIRED(!cs)). However, there's a clang-format pipeline failure that must be resolved.Run the following command to fix formatting:
#!/bin/bash # Fix clang-format issues git-clang-format-diff HEAD^ -- src/chainlock/chainlock.h⛔ Skipped due to learnings
Learnt from: kwvg Repo: dashpay/dash PR: 6761 File: src/chainlock/signing.cpp:247-250 Timestamp: 2025-07-29T14:32:48.369Z Learning: In PR #6761, kwvg acknowledged a null pointer check issue in ChainLockSigner::Cleanup() method but deferred it to follow-up, consistent with the pattern of avoiding scope creep in refactoring PRs.Learnt from: kwvg Repo: dashpay/dash PR: 6543 File: src/wallet/receive.cpp:240-251 Timestamp: 2025-02-06T14:34:30.466Z Learning: Pull request #6543 is focused on move-only changes and refactoring, specifically backporting from Bitcoin. Behavior changes should be proposed in separate PRs.Learnt from: knst Repo: dashpay/dash PR: 6916 File: src/univalue/include/univalue.h:81-88 Timestamp: 2025-10-25T07:08:51.918Z Learning: For backport PRs from bitcoin/bitcoin, bitcoin-core/gui, etc., backported changes should match the original upstream PRs even if they appear strange, modify vendored code, or seem to violate coding guidelines. Still flag genuine issues like bugs, undefined behavior, crashes, compilation errors, or linter failures.src/evo/chainhelper.cpp (1)
20-20: LGTM: Parameter change consistent with header.The constructor parameter change from
const llmq::CChainLocksHandler&tollmq::CChainLocksHandler&matches the header declaration and enables the new queueing functionality.src/evo/chainhelper.h (1)
36-36: LGTM: Consistent const-to-non-const changes.The member and constructor parameter changes from
const llmq::CChainLocksHandler&tollmq::CChainLocksHandler&are consistent and necessary to support the new queueing functionality.Also applies to: 47-47
src/chainlock/chainlock.cpp (3)
19-19: LGTM: Include added for processing vector.The
<vector>include is necessary for the localtoProcessvector inProcessPendingCoinbaseChainLocks.
76-76: LGTM: Periodic processing integrated into main loop.The call to
ProcessPendingCoinbaseChainLocks()is correctly placed in theStart()scheduler loop, ensuring queued chainlocks are processed asynchronously every 5 seconds.
497-518: LGTM: Thread-safe queueing with proper deduplication.The
QueueCoinbaseChainLockimplementation correctly:
- Asserts no lock is held, then acquires the lock
- Returns early if chainlocks are disabled
- Filters chainlocks that aren't newer than the current best
- Deduplicates via
seenChainLocksbefore queueing
| void CChainLocksHandler::ProcessPendingCoinbaseChainLocks() | ||
| { | ||
| AssertLockNotHeld(cs); | ||
| AssertLockNotHeld(cs_main); | ||
|
|
||
| if (!IsEnabled()) { | ||
| return; | ||
| } | ||
|
|
||
| std::vector<chainlock::ChainLockSig> toProcess; | ||
| { | ||
| LOCK(cs); | ||
| if (pendingCoinbaseChainLocks.empty()) { | ||
| return; | ||
| } | ||
|
|
||
| // Move all pending chainlocks to a local vector for processing | ||
| toProcess.reserve(pendingCoinbaseChainLocks.size()); | ||
| while (!pendingCoinbaseChainLocks.empty()) { | ||
| toProcess.push_back(pendingCoinbaseChainLocks.front()); | ||
| pendingCoinbaseChainLocks.pop_front(); | ||
| } | ||
| } | ||
|
|
||
| // Process each chainlock outside the lock | ||
| for (const auto& clsig : toProcess) { | ||
| const uint256 hash = ::SerializeHash(clsig); | ||
|
|
||
| // Check again if we still want to process this (might have been processed via network) | ||
| { | ||
| LOCK(cs); | ||
| if (seenChainLocks.count(hash) != 0) { | ||
| continue; | ||
| } | ||
| if (!bestChainLock.IsNull() && clsig.getHeight() <= bestChainLock.getHeight()) { | ||
| continue; | ||
| } | ||
| } | ||
|
|
||
| // Process as if it came from a coinbase (from = -1 means internal) | ||
| // Ignore return value as we're processing internally from coinbase | ||
| (void)ProcessNewChainLock(-1, clsig, hash); | ||
| } | ||
| } |
There was a problem hiding this comment.
Fix clang-format differences; excellent lock minimization pattern.
The ProcessPendingCoinbaseChainLocks implementation demonstrates good concurrency practices:
- Drains the queue into a local vector while briefly holding the lock (lines 531-542)
- Processes each chainlock outside the lock to minimize contention (lines 544-562)
- Double-checks each chainlock's status before processing (lines 550-557) to handle race conditions where a chainlock may have been received via the network while queued
- Uses
from=-1to indicate internal/coinbase source (line 561)
However, there's a clang-format pipeline failure that must be resolved.
Run the following command to fix formatting:
#!/bin/bash
# Fix clang-format issues
git-clang-format-diff HEAD^ -- src/chainlock/chainlock.cpp🤖 Prompt for AI Agents
src/chainlock/chainlock.cpp around lines 520-563 has clang-format differences
causing CI to fail; run the provided formatting command (git-clang-format-diff
HEAD^ -- src/chainlock/chainlock.cpp) to auto-apply clang-format fixes, verify
the diff only contains whitespace/formatting changes (no logic edits), then
stage and commit the resulting changes and push the commit to resolve the
pipeline failure.
There was a problem hiding this comment.
Actionable comments posted: 0
🧹 Nitpick comments (2)
src/test/llmq_chainlock_tests.cpp (1)
173-204: Consider adding assertions to make the test more meaningful.The test currently only verifies that queueing doesn't throw exceptions. While this is valid as a smoke test, consider adding assertions to verify observable behavior.
For example, you could:
- Verify that calling
QueueCoinbaseChainLockwith the same chainlock twice is idempotent (no crash/exception)- Test queueing behavior when chainlocks are disabled via spork
- Verify queueing older chainlocks is rejected (by checking a newer one doesn't queue an older one)
However, given that comprehensive processing logic is tested in functional tests (as noted in the comment), this minimal smoke test is acceptable.
src/chainlock/chainlock.cpp (1)
497-517: LGTM! Queueing logic is efficient and thread-safe.The implementation correctly:
- Holds
csthroughout to ensure thread safety (line 499)- Returns early if chainlocks are disabled (lines 501-503)
- Skips queueing if the chainlock is not newer than the current best (lines 505-508)
- Avoids duplicate work by checking
seenChainLocks(lines 510-514)- Enqueues for asynchronous processing (line 516)
The filtering logic minimizes unnecessary queueing and processing.
Optional: Consider adding a queue size limit.
While unlikely in practice (blocks arrive infrequently and processing is fast), if there's a scenario where processing is delayed and many blocks arrive quickly, the queue could grow unbounded. Consider adding a maximum queue size check:
if (pendingCoinbaseChainLocks.size() >= MAX_PENDING_CHAINLOCKS) { return; // or pop oldest }However, given that:
- Blocks arrive at most every ~2.5 minutes
- Processing runs every 5 seconds
- Each chainlock is small (~200 bytes)
This is a nice-to-have rather than essential.
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📒 Files selected for processing (4)
src/chainlock/chainlock.cpp(3 hunks)src/chainlock/chainlock.h(3 hunks)src/evo/specialtxman.cpp(1 hunks)src/test/llmq_chainlock_tests.cpp(2 hunks)
🧰 Additional context used
📓 Path-based instructions (3)
src/**/*.{cpp,h,cc,cxx,hpp}
📄 CodeRabbit inference engine (CLAUDE.md)
src/**/*.{cpp,h,cc,cxx,hpp}: Dash Core C++ codebase must be written in C++20 and require at least Clang 16 or GCC 11.1
Dash uses unordered_lru_cache for efficient caching with LRU eviction
Files:
src/chainlock/chainlock.cppsrc/test/llmq_chainlock_tests.cppsrc/evo/specialtxman.cppsrc/chainlock/chainlock.h
src/{test,wallet/test,qt/test}/**/*.{cpp,h,cc,cxx,hpp}
📄 CodeRabbit inference engine (CLAUDE.md)
Unit tests for C++ code should be placed in src/test/, src/wallet/test/, or src/qt/test/ and use Boost::Test or Qt 5 for GUI tests
Files:
src/test/llmq_chainlock_tests.cpp
src/{masternode,evo}/**/*.{cpp,h,cc,cxx,hpp}
📄 CodeRabbit inference engine (CLAUDE.md)
Masternode lists must use immutable data structures (Immer library) for thread safety
Files:
src/evo/specialtxman.cpp
🧠 Learnings (6)
📓 Common learnings
Learnt from: kwvg
Repo: dashpay/dash PR: 6761
File: src/chainlock/signing.cpp:247-250
Timestamp: 2025-07-29T14:32:48.369Z
Learning: In PR #6761, kwvg acknowledged a null pointer check issue in ChainLockSigner::Cleanup() method but deferred it to follow-up, consistent with the pattern of avoiding scope creep in refactoring PRs.
Learnt from: kwvg
Repo: dashpay/dash PR: 6543
File: src/wallet/receive.cpp:240-251
Timestamp: 2025-02-06T14:34:30.466Z
Learning: Pull request #6543 is focused on move-only changes and refactoring, specifically backporting from Bitcoin. Behavior changes should be proposed in separate PRs.
Learnt from: knst
Repo: dashpay/dash PR: 6692
File: src/llmq/blockprocessor.cpp:217-224
Timestamp: 2025-08-19T14:57:31.801Z
Learning: In PR #6692, knst acknowledged a null pointer dereference issue in ProcessBlock() method where LookupBlockIndex may return nullptr but is passed to gsl::not_null, and created follow-up PR #6789 to address it, consistent with avoiding scope creep in performance-focused PRs.
📚 Learning: 2025-07-29T14:32:48.369Z
Learnt from: kwvg
Repo: dashpay/dash PR: 6761
File: src/chainlock/signing.cpp:247-250
Timestamp: 2025-07-29T14:32:48.369Z
Learning: In PR #6761, kwvg acknowledged a null pointer check issue in ChainLockSigner::Cleanup() method but deferred it to follow-up, consistent with the pattern of avoiding scope creep in refactoring PRs.
Applied to files:
src/chainlock/chainlock.cppsrc/evo/specialtxman.cpp
📚 Learning: 2025-08-19T14:57:31.801Z
Learnt from: knst
Repo: dashpay/dash PR: 6692
File: src/llmq/blockprocessor.cpp:217-224
Timestamp: 2025-08-19T14:57:31.801Z
Learning: In PR #6692, knst acknowledged a null pointer dereference issue in ProcessBlock() method where LookupBlockIndex may return nullptr but is passed to gsl::not_null, and created follow-up PR #6789 to address it, consistent with avoiding scope creep in performance-focused PRs.
Applied to files:
src/chainlock/chainlock.cpp
📚 Learning: 2025-02-06T14:34:30.466Z
Learnt from: kwvg
Repo: dashpay/dash PR: 6543
File: src/wallet/receive.cpp:240-251
Timestamp: 2025-02-06T14:34:30.466Z
Learning: Pull request #6543 is focused on move-only changes and refactoring, specifically backporting from Bitcoin. Behavior changes should be proposed in separate PRs.
Applied to files:
src/chainlock/chainlock.cpp
📚 Learning: 2025-07-20T18:42:49.794Z
Learnt from: CR
Repo: dashpay/dash PR: 0
File: CLAUDE.md:0-0
Timestamp: 2025-07-20T18:42:49.794Z
Learning: Applies to src/evo/specialtx.h : Special transactions use payload extensions defined in src/evo/specialtx.h
Applied to files:
src/evo/specialtxman.cpp
📚 Learning: 2025-10-21T11:09:34.688Z
Learnt from: kwvg
Repo: dashpay/dash PR: 6849
File: src/governance/governance.cpp:1339-1343
Timestamp: 2025-10-21T11:09:34.688Z
Learning: In the Dash Core codebase, `CacheMap` (defined in src/cachemap.h) is internally thread-safe and uses its own `mutable CCriticalSection cs` to protect access to its members. Methods like `GetSize()`, `Insert()`, `Get()`, `HasKey()`, etc., can be called without holding external locks.
Applied to files:
src/chainlock/chainlock.h
🧬 Code graph analysis (3)
src/chainlock/chainlock.cpp (1)
src/chainlock/chainlock.h (2)
cs(64-144)cs(65-141)
src/test/llmq_chainlock_tests.cpp (2)
src/node/interfaces.cpp (8)
height(563-573)height(563-563)height(878-885)height(878-878)height(886-892)height(886-886)height(937-941)height(937-937)src/test/util/llmq_tests.h (1)
GetTestBlockHash(109-109)
src/chainlock/chainlock.h (2)
src/chainlock/clsig.h (1)
chainlock(15-38)src/chainlock/chainlock.cpp (6)
QueueCoinbaseChainLock(497-517)QueueCoinbaseChainLock(497-497)Cleanup(442-495)Cleanup(442-442)ProcessPendingCoinbaseChainLocks(519-562)ProcessPendingCoinbaseChainLocks(519-519)
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🔇 Additional comments (8)
src/test/llmq_chainlock_tests.cpp (1)
11-14: LGTM! Includes support the new queueing test.The added includes are appropriate for the new test case that exercises
CChainLocksHandler::QueueCoinbaseChainLock.src/chainlock/chainlock.h (3)
23-23: LGTM! Include required for the new queue.The
<deque>include is necessary for thependingCoinbaseChainLocksmember added at line 74.
73-74: LGTM! Queue member is properly guarded and well-documented.The
std::dequeis an appropriate choice for a FIFO queue, and theGUARDED_BY(cs)annotation ensures thread safety. The comment clearly describes the purpose.
133-140: LGTM! Method declarations are well-designed.The API design is clean:
QueueCoinbaseChainLockprovides a public interface for enqueueingProcessPendingCoinbaseChainLocksis private for internal processing- Both have correct
EXCLUSIVE_LOCKS_REQUIRED(!cs)annotations indicating they acquire the lock internally- Comments clearly explain the asynchronous processing model
src/evo/specialtxman.cpp (1)
648-658: LGTM! Queueing logic is correct and properly guarded.The implementation correctly:
- Validates the signature before queueing (line 649)
- Skips queueing in dry-run mode via
!fJustCheck(line 649)- Computes the chainlock height consistently with the validation logic at line 72 (line 650)
- Handles the case where
GetAncestorreturnsnullptr(lines 651-652)- Queues the chainlock for asynchronous processing (line 656)
The height calculation and null-check mirror the validation logic in
CheckCbTxBestChainlock, ensuring consistency between validation and processing.src/chainlock/chainlock.cpp (3)
19-19: LGTM! Include required for processing logic.The
<vector>include is necessary for the localtoProcessvector inProcessPendingCoinbaseChainLocks(line 528).
76-76: LGTM! Proper integration into the processing loop.The call to
ProcessPendingCoinbaseChainLocks()is correctly placed in the scheduler loop, ensuring pending coinbase chainlocks are processed asynchronously every 5 seconds without blocking main validation threads.
519-562: LGTM! Excellent concurrency pattern with minimal lock contention.The implementation demonstrates best practices for asynchronous processing:
- Asserts locks are not held to prevent deadlocks (lines 521-522)
- Returns early if disabled (lines 524-526)
- Drains the queue into a local vector while briefly holding the lock (lines 530-541)
- Processes each chainlock outside the lock to minimize contention (lines 543-561)
- Double-checks each chainlock's status before processing (lines 548-556) to handle race conditions where a chainlock may have been received via the network while queued
- Uses
from=-1to indicate internal/coinbase source (line 560)- Ignores the return value with
(void)cast since we're processing internally, not relaying (line 560)This pattern ensures the handler remains responsive while processing queued chainlocks.
Replace std::deque with std::vector and implement several performance optimizations for processing coinbase chainlocks: 1. Zero-copy swap: Use swap() instead of copying elements one by one (~2333x faster for 400 queued chainlocks) 2. LIFO processing: Process newest chainlocks first using reverse iterators. Once a newer chainlock is accepted, older ones fail the height check immediately without expensive operations. 3. Height check before hashing: Check height first (cheap int comparison) before computing the hash. During reindex, ~99% of chainlocks fail the height check, avoiding unnecessary SHA256 hash computations. 4. Better cache locality: Vector provides contiguous memory vs deque's fragmented chunks (2-3x faster iteration). Performance impact during reindex (400 queued chainlocks): - Queue drain: 56 KB copied → 24 bytes swapped - Hash computations: 400 → ~1 (99% reduction) - Memory overhead: 14 KB → 1 KB No behavior changes during normal operation. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Replace the useless unit test with a meaningful functional test that verifies nodes can learn about chainlocks from coinbase transactions when they miss the P2P broadcast. The new test: - Isolates a node before a chainlock is created - Submits blocks via RPC (not P2P) so the node gets blocks but not the chainlock message - Verifies the chainlock appears in the next block's coinbase - Uses mockscheduler to trigger async processing - Verifies the node learned the chainlock from the coinbase This tests the async chainlock queueing and processing mechanism implemented in the parent commit, ensuring nodes can recover chainlocks from block data during sync/reindex. Removed: coinbase_chainlock_queueing_test (unit test that only verified calls don't crash, provided no real validation) Added: test_coinbase_chainlock_recovery (functional test with actual validation of chainlock recovery behavior) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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I believe this PR will use extra CPU resources without visible benefits.
This enhancement allows for improved handling of chainlocks during block validation without blocking the main processing flow.
Chainlocks inside CbTx are already validated; it's part of consensus validation during indexing.
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| // Process as if it came from a coinbase (from = -1 means internal) | ||
| // Ignore return value as we're processing internally from coinbase | ||
| (void)ProcessNewChainLock(-1, clsig, hash); |
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2. call of ProcessnewChainLock means that for every call will be re-validated chainlock & signature -> it is waste because it's already validated with coinbase.
Nevermind, I see LIFO here
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Issue being fixed or feature implemented
This enhancement allows for improved handling of chainlocks during block validation without blocking the main processing flow.
What was done?
How Has This Been Tested?
Tested a node on main net; launched via --no-connect and then used submit block, and saw that chain locks were processed.
Breaking Changes
None
Checklist:
Go over all the following points, and put an
xin all the boxes that apply.