Implemented MultiPV support #40
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WalkthroughThe changes introduce support for handling multiple principal variations (MultiPV) in the chess engine's UCI interface. This includes updating data structures to store multiple info lines, modifying response processing to accommodate MultiPV, ensuring proper initialization, and adding tests to verify MultiPV functionality. Changes
Sequence Diagram(s)sequenceDiagram
participant Test as Test Function
participant Engine as UCI Engine
participant Stockfish as Stockfish Engine
Test->>Engine: Create new Engine (with MultiPVInfo initialized)
Test->>Engine: Set option multipv=3
Test->>Engine: Send position (FEN)
Test->>Engine: Go movetime 100
Engine->>Stockfish: Send UCI commands
Stockfish-->>Engine: Responds with multiple info lines (MultiPV)
Engine->>Engine: Parse info lines, populate MultiPVInfo
Test->>Engine: Retrieve SearchResults
Test->>Test: Assert MultiPVInfo contents
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Actionable comments posted: 0
🧹 Nitpick comments (3)
uci/cmd.go (1)
329-337: Consider defining a constant for the magic numberThe code uses a magic number
300as an upper bound for valid MultiPV indices. Consider defining this as a named constant for better code readability and maintenance.+// MaxMultiPV defines the maximum number of principal variations we'll process +const MaxMultiPV = 300 - if info.Multipv > 1 && info.Multipv < 300 { + if info.Multipv > 1 && info.Multipv < MaxMultiPV {uci/engine_test.go (2)
26-53: Test_EngineInfo: Document why the test is skippedThis test verifies that the primary principal variation is correctly populated but is currently skipped with
t.SkipNow(). Consider adding a comment explaining why the test is skipped (e.g., requires Stockfish installation, long-running test, etc.) or remove the skip if it's ready to be run in CI.func Test_EngineInfo(t *testing.T) { + // TODO: This test is skipped because it requires Stockfish to be installed + // at the specified path. Remove this skip when running tests locally with Stockfish. t.SkipNow()
55-99: Test_EngineMultiPVInfo: Comprehensive verification of multiple PV linesThis test thoroughly verifies that all three expected MultiPV lines are populated correctly, checking both the count and the specific first move of each line. Consider documenting why the test is skipped, similar to the previous test.
func Test_EngineMultiPVInfo(t *testing.T) { + // TODO: This test is skipped because it requires Stockfish to be installed + // at the specified path. Remove this skip when running tests locally with Stockfish. t.SkipNow()
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📒 Files selected for processing (4)
uci/cmd.go(2 hunks)uci/engine.go(1 hunks)uci/engine_test.go(1 hunks)uci/info.go(1 hunks)
🧰 Additional context used
🧬 Code Graph Analysis (3)
uci/info.go (1)
move.go (1)
Move(25-37)
uci/cmd.go (1)
uci/info.go (2)
SearchResults(16-21)Info(89-103)
uci/engine.go (2)
uci/cmd.go (2)
CmdPosition(157-160)CmdPosition(178-180)uci/info.go (2)
SearchResults(16-21)Info(89-103)
⏰ Context from checks skipped due to timeout of 90000ms (1)
- GitHub Check: vulncheck
🔇 Additional comments (10)
uci/info.go (1)
17-20: Well-structured addition of MultiPV supportThe addition of
MultiPVInfo []Infofield to theSearchResultsstruct is a clean implementation for storing multiple principal variations. This complements the existing fields likeBestMove,Ponder, andInfowhile maintaining backward compatibility.uci/engine.go (1)
55-55: Proper initialization of MultiPVInfo sliceGood practice to initialize the
MultiPVInfofield as an empty slice when creating a new Engine instance. This ensures the slice is never nil, preventing potential nil pointer dereference errors later in the code.uci/cmd.go (5)
290-290: Good initialization of MultiPVInfo slice with capacityInitializing the
MultiPVInfoslice with an initial capacity of 1 is a good approach to prepare for storing multiple PV lines while ensuring the slice is never nil.
321-323: Improved error handling for more robust parsingContinuing on unmarshaling errors rather than returning them makes the processing more resilient against malformed input lines from the engine.
325-327: Clear handling of primary principal variationThis code appropriately handles the primary principal variation (Multipv 0 or 1) by assigning it to the main
Infofield, maintaining backward compatibility.
331-335: Efficient slice expansion for multiple PV linesThis code efficiently expands the slice only when necessary to accommodate higher MultiPV indices, avoiding unnecessary allocations.
339-339: Ensuring consistency between Info and MultiPVInfoSetting the first element of
MultiPVInfoto matchresults.Infoensures consistency between the primary PV in both data structures, which is a good practice.uci/engine_test.go (3)
40-42: Well-structured test configuration for MultiPVGood test setup that explicitly configures the engine for MultiPV mode with 3 lines, sets a position, and runs a search with a reasonable time limit.
76-80: Good validation of MultiPV line countThe test correctly verifies that exactly 3 MultiPV lines are returned, matching the configuration set with the "multipv" option.
82-98: Thorough verification of each principal variationExcellent test coverage that verifies the expected first move for each of the 3 principal variations. This ensures that the MultiPV parsing and storage work correctly.
2 participants
Resolves issue #39
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