Form: Return a Token from registerWrite - #830
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…sed for the row number (write side)
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📝 WalkthroughWalkthroughThe write path now returns zero-based row identifiers. ChangesWrite token flow
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟠 High · up to The PR exposes row tokens for newly written products, but failed writes can still return a token that points to nonexistent data, and large row identifiers can be narrowed incorrectly during reads. These data-location risks should be fixed before merging. Sequence Diagram(s)sequenceDiagram
participant PersistenceWriter
participant StorageWriter
participant WriteContainer
participant StorageReader
PersistenceWriter->>StorageWriter: fillContainer(placement, data, type)
StorageWriter->>WriteContainer: fill(data)
WriteContainer-->>StorageWriter: row id or kInvalidRowId
StorageWriter-->>PersistenceWriter: row id
PersistenceWriter-->>PersistenceWriter: return Token
StorageReader->>StorageReader: readContainer(Token)
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 5
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Inline comments:
In `@form/core/token.hpp`:
- Around line 20-27: Rename Token::hasId() to has_id(), m_hasId to m_has_id_,
and the placement-only constructor parameters to file_name and container_name;
update all corresponding declarations, definitions, call sites, and tests while
preserving behavior.
In `@form/root_storage/root_tbranch_write_container.cpp`:
- Around line 115-120: Update the write flow around TBranch::Fill() to capture
its return value and, when negative, reset the branch address and throw before
accessing GetEntries() or creating the Token row. Preserve the existing
successful Fill behavior and row calculation.
In `@form/storage/istorage.hpp`:
- Around line 19-21: Rename the sentinel constant kInvalidRowId to
k_invalid_row_id and update every reference to use the new lower_case
identifier, preserving its value and behavior.
Apply the same fix in `@form/persistence/persistence_writer.cpp` at line 58: The
same constant is used here and must be renamed consistently.
In `@form/storage/storage_reader.cpp`:
- Around line 391-392: Update the read path around Token::id() and
IStorage_Read_Container::read so 64-bit row identifiers are preserved end to
end; widen the read interface and both ROOT implementations, including their
bounds checks, to std::uint64_t. Do not cast Token::id() to int; if widening is
not possible, validate and reject values above INT_MAX before invoking read.
In `@test/form/form_storage_test.cpp`:
- Around line 376-386: Update the test’s StorageReader::readContainer result
handling to take ownership of both allocated vectors using
std::unique_ptr<std::vector<int> const> before the assertions, replacing the
raw-pointer variables while preserving the existing null and value checks.
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📒 Files selected for processing (21)
form/core/token.cppform/core/token.hppform/persistence/ipersistence_writer.hppform/persistence/persistence_writer.cppform/persistence/persistence_writer.hppform/root_storage/root_rfield_write_container.cppform/root_storage/root_rfield_write_container.hppform/root_storage/root_rntuple_write_container.cppform/root_storage/root_rntuple_write_container.hppform/root_storage/root_tbranch_write_container.cppform/root_storage/root_tbranch_write_container.hppform/root_storage/root_ttree_write_container.cppform/root_storage/root_ttree_write_container.hppform/storage/istorage.hppform/storage/storage_reader.cppform/storage/storage_write_container.cppform/storage/storage_write_container.hppform/storage/storage_writer.cppform/storage/storage_writer.hpptest/form/form_basics_test.cpptest/form/form_storage_test.cpp
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**/*.{cpp,cc,cxx,h,hpp}
📄 CodeRabbit inference engine (.github/copilot-instructions.md)
**/*.{cpp,cc,cxx,h,hpp}: Use clang-format tool for all C++ code formatting (VS Code auto-formats on save); configuration defined in.clang-formatwith 100-character line limit and 2-space indentation
Follow clang-tidy recommendations defined in.clang-tidy
Files:
form/storage/storage_writer.hppform/root_storage/root_rfield_write_container.hppform/persistence/persistence_writer.hppform/core/token.cppform/storage/storage_write_container.hppform/storage/storage_write_container.cppform/root_storage/root_rntuple_write_container.hppform/root_storage/root_tbranch_write_container.cppform/root_storage/root_ttree_write_container.cppform/root_storage/root_rntuple_write_container.cppform/root_storage/root_tbranch_write_container.hppform/persistence/persistence_writer.cppform/root_storage/root_ttree_write_container.hpptest/form/form_storage_test.cppform/storage/storage_reader.cppform/storage/storage_writer.cppform/core/token.hppform/storage/istorage.hppform/root_storage/root_rfield_write_container.cppform/persistence/ipersistence_writer.hpptest/form/form_basics_test.cpp
**/*.{hpp,cpp}
📄 CodeRabbit inference engine (AGENTS.md)
**/*.{hpp,cpp}: Use.hppfor header files,.cppfor implementation, and*_test.cppfor test files in C++
Enforce 100-character line limit and 2-space indentation in C++ code via.clang-format
UseQualifierAlignment: Right(east-const) style:int const xnotconst int xin C++
UsePointerAlignment: Leftin C++ (pointer*attached to type, not variable name)
All C++ identifiers must uselower_casenaming: namespaces, classes, structs, enums, functions, variables, parameters, members, and constants
Exception to C++ naming: template parameters useCamelCase
Exception to C++ naming: macros useUPPER_CASE
Private, protected, and constant members in C++ must have a trailing underscore (_), no trailing underscore on anything else
Useenum classpreferred over plainenumin C++
Usestd::shared_ptrfor shared ownership,std::unique_ptrfor exclusive ownership, raw pointers for non-owning references only in C++
Use functors with agent-noun pattern:ModelEvaluator evaluate_model(...)in C++
Apply.clang-tidychecks for bugprone, cert, clang-analyzer, concurrency, cppcoreguidelines, misc, modernize, performance, portability, and readability as defined in the.clang-tidyconfiguration file
Usephlex::namespace for core code,phlex::experimental::for experimental features in C++
Files:
form/storage/storage_writer.hppform/root_storage/root_rfield_write_container.hppform/persistence/persistence_writer.hppform/core/token.cppform/storage/storage_write_container.hppform/storage/storage_write_container.cppform/root_storage/root_rntuple_write_container.hppform/root_storage/root_tbranch_write_container.cppform/root_storage/root_ttree_write_container.cppform/root_storage/root_rntuple_write_container.cppform/root_storage/root_tbranch_write_container.hppform/persistence/persistence_writer.cppform/root_storage/root_ttree_write_container.hpptest/form/form_storage_test.cppform/storage/storage_reader.cppform/storage/storage_writer.cppform/core/token.hppform/storage/istorage.hppform/root_storage/root_rfield_write_container.cppform/persistence/ipersistence_writer.hpptest/form/form_basics_test.cpp
**/*.hpp
📄 CodeRabbit inference engine (AGENTS.md)
Avoid boolean parameters in C++ interfaces; prefer enumerations instead
Files:
form/storage/storage_writer.hppform/root_storage/root_rfield_write_container.hppform/persistence/persistence_writer.hppform/storage/storage_write_container.hppform/root_storage/root_rntuple_write_container.hppform/root_storage/root_tbranch_write_container.hppform/root_storage/root_ttree_write_container.hppform/core/token.hppform/storage/istorage.hppform/persistence/ipersistence_writer.hpp
🪛 Cppcheck (2.21.0)
form/core/token.cpp
[style] 39-39: The function 'id' is never used.
(unusedFunction)
[style] 41-41: The function 'hasId' is never used.
(unusedFunction)
form/root_storage/root_tbranch_write_container.cpp
[style] 97-97: The function 'fill' is never used.
(unusedFunction)
form/root_storage/root_ttree_write_container.cpp
[style] 48-48: The function 'fill' is never used.
(unusedFunction)
form/persistence/persistence_writer.cpp
[style] 52-52: The function 'to_string' is never used.
(unusedFunction)
🔇 Additional comments (17)
form/core/token.hpp (1)
8-8: LGTM!Also applies to: 17-18
form/storage/storage_write_container.cpp (1)
21-21: LGTM!form/root_storage/root_rfield_write_container.cpp (1)
64-64: LGTM!Also applies to: 82-86
form/root_storage/root_rntuple_write_container.cpp (1)
32-35: LGTM!form/root_storage/root_ttree_write_container.cpp (1)
48-51: LGTM!form/persistence/persistence_writer.hpp (1)
34-37: LGTM!form/persistence/persistence_writer.cpp (1)
51-57: LGTM!Also applies to: 59-61
form/storage/istorage.hpp (1)
50-53: LGTM!Also applies to: 77-78
form/storage/storage_writer.hpp (1)
26-28: LGTM!form/storage/storage_writer.cpp (1)
106-108: LGTM!Also applies to: 118-118
form/storage/storage_write_container.hpp (1)
23-23: LGTM!form/root_storage/root_rfield_write_container.hpp (1)
26-26: LGTM!form/root_storage/root_tbranch_write_container.hpp (1)
28-28: LGTM!form/root_storage/root_rntuple_write_container.hpp (1)
55-55: LGTM!form/root_storage/root_ttree_write_container.hpp (1)
28-28: LGTM!form/persistence/ipersistence_writer.hpp (1)
6-7: LGTM!Also applies to: 32-37
test/form/form_storage_test.cpp (1)
334-372: LGTM!Also applies to: 389-417
Codecov Report✅ All modified and coverable lines are covered by tests. @@ Coverage Diff @@
## main #830 +/- ##
==========================================
+ Coverage 84.06% 84.14% +0.07%
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Files 173 173
Lines 7399 7416 +17
Branches 884 886 +2
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+ Hits 6220 6240 +20
+ Misses 893 892 -1
+ Partials 286 284 -2
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aolivier23
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aolivier23
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Looks good enough to me. I could be very happy with the code as-is. Two additional things we could consider:
std::optional<>instead of sentinel values: worth using the newer standard, or better to use the well-known technique?- We should fix that coderabbit comment about the test if we can. I like to memcheck our tests when something goes wrong.
gemmeren
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gemmeren
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Thanks @wwuoneway
I leave it up to you whether you want to use optional (which seems like a good strategy).
Other than that, this looks good to me.
Agreed |
4 participants
Why: When a product is written we currently get nothing back, so the row it landed in is only recoverable by re-scanning the container on read. This surfaces that information at write time as a Token (placement + row) — the piece needed to locate the product again, and the basis for the upcoming navigation/index work (FORM will collect these Tokens and hand them to commitOutput()).
What:
registerWrite()now returns a Token built directly from the product's placement and the 0-based row it was written to. If the backend doesn't address rows, the Token has no id set.The row / Token::id type is
std::uint64_t— wide enough for both backends' entry counts (TBranch::GetEntries(), RNTuple::GetNEntries()) and never narrower than RNTuple. Threaded through the write chain:fill/fillContainer/registerWrite.Token gains an explicit not-set state (
hasId()), replacing the old -1 sentinel. The write chain useskInvalidRowIdfor "no addressable row";registerWritemaps it to a not-set Token.ROOT backends: TBranch returns
GetEntries()- 1 (row persists on Fill()); RField returnsGetNEntries()(entry persists on commit()). Both yield the same 0-based row the reader uses.Note of follow-up:
intfor now; the single write→read narrowing is made explicit with a documented static_cast. Widening the read path to 64-bit is a follow-up.commitOutput()registers them into an index container, which is a follow-up.Code
registerWrite()to return aTokenwith product placement and a 0-based row ID.Token::id()tostd::uint64_t.Token::hasId()and replaced the-1sentinel with an explicit unset state.kInvalidRowIdfor backends that do not address rows.fill,fillContainer, andregisterWrite.TBranchusesGetEntries() - 1.RFieldusesGetNEntries().intAPI.Tests
Tokentests forhasId()and unsigned IDs.Deferred