File write read improvements #150
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WalkthroughThe changes introduce a new, efficient mechanism for reading files with line-based offsets and lengths, especially optimizing tail reads and large files. Warning and success messages for file writing are revised for clarity and positivity. Tool documentation is updated for clearer guidance, and new tests are added to verify and analyze negative offset behavior in file reading. Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant Server
participant Filesystem
User->>Server: Request read_file(filePath, offset, length)
Server->>Filesystem: readFileWithSmartPositioning(filePath, offset, length)
alt offset < 0 (tail read)
alt Large file & small N
Filesystem->>Filesystem: readLastNLinesReverse()
else Large file & large N
Filesystem->>Filesystem: readFromEndWithReadline()
else Small file
Filesystem->>Filesystem: read entire, slice tail
end
else offset >= 0
alt Small file or offset 0
Filesystem->>Filesystem: readFromStartWithReadline()
else Large file & deep offset
Filesystem->>Filesystem: readFromEstimatedPosition()
end
end
Filesystem-->>Server: FileResult (content, status)
Server-->>User: File content / status
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📜 Recent review detailsConfiguration used: CodeRabbit UI 📒 Files selected for processing (4)
✅ Files skipped from review due to trivial changes (3)
🚧 Files skipped from review as they are similar to previous changes (1)
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Actionable comments posted: 1
🧹 Nitpick comments (4)
test/test-negative-offset-analysis.js (1)
34-36: Consider renaming the function to clarify its purpose.The function name
runTestsmight be misleading since this doesn't actually run tests but rather documents broken behavior.Consider renaming to better reflect its purpose:
-export default async function runTests() { +export default async function documentBrokenBehavior() { return false; // Test documents that negative offsets are broken }src/tools/filesystem.ts (3)
344-380: Consider adding error handling for stream cleanup.While the circular buffer implementation is excellent, consider wrapping the reading logic in a try-finally block to ensure the readline interface is closed even if an error occurs.
async function readFromEndWithReadline(filePath: string, requestedLines: number, mimeType: string, includeStatusMessage: boolean = true): Promise<FileResult> { const rl = createInterface({ input: createReadStream(filePath), crlfDelay: Infinity }); const buffer: string[] = new Array(requestedLines); let bufferIndex = 0; let totalLines = 0; - for await (const line of rl) { - buffer[bufferIndex] = line; - bufferIndex = (bufferIndex + 1) % requestedLines; - totalLines++; - } - - rl.close(); + try { + for await (const line of rl) { + buffer[bufferIndex] = line; + bufferIndex = (bufferIndex + 1) % requestedLines; + totalLines++; + } + } finally { + rl.close(); + } // Extract lines in correct order let result: string[];
382-414: Consider adding error handling for stream cleanup.Similar to the previous function, consider wrapping the reading logic in a try-finally block.
async function readFromStartWithReadline(filePath: string, offset: number, length: number, mimeType: string, includeStatusMessage: boolean = true): Promise<FileResult> { const rl = createInterface({ input: createReadStream(filePath), crlfDelay: Infinity }); const result: string[] = []; let lineNumber = 0; - for await (const line of rl) { - if (lineNumber >= offset && result.length < length) { - result.push(line); - } - if (result.length >= length) break; // Early exit optimization - lineNumber++; - } - - rl.close(); + try { + for await (const line of rl) { + if (lineNumber >= offset && result.length < length) { + result.push(line); + } + if (result.length >= length) break; // Early exit optimization + lineNumber++; + } + } finally { + rl.close(); + }
416-487: Consider adding error handling for stream cleanup in both readline interfaces.The byte position estimation strategy is excellent for large files. However, both readline interfaces should be wrapped in try-finally blocks for proper cleanup.
The function has two readline interfaces that need proper cleanup. Would you like me to provide a complete refactored version with proper error handling for both?
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📒 Files selected for processing (6)
src/handlers/filesystem-handlers.ts(1 hunks)src/server.ts(2 hunks)src/tools/edit.ts(2 hunks)src/tools/filesystem.ts(4 hunks)test/test-negative-offset-analysis.js(1 hunks)test/test-negative-offset-readfile.js(1 hunks)
🧰 Additional context used
🧬 Code Graph Analysis (2)
src/tools/edit.ts (1)
src/tools/filesystem.ts (1)
readFileInternal(598-620)
test/test-negative-offset-readfile.js (4)
setup-claude-server.js (1)
setup(512-751)src/config-manager.ts (1)
configManager(212-212)test/test.js (1)
fs(41-41)src/handlers/filesystem-handlers.ts (1)
handleReadFile(47-105)
🔇 Additional comments (15)
src/tools/edit.ts (2)
1-1: Good addition of internal file reading capability.Adding
readFileInternalto the imports provides access to the optimized internal file reading function.
122-123: Excellent optimization for internal file operations.The switch from
readFiletoreadFileInternalis a smart improvement for the edit functionality. This change eliminates unnecessary status messages and uses the optimized reading path that's better suited for internal operations within the edit tool.test/test-negative-offset-analysis.js (1)
1-33: Excellent documentation of the negative offset issue.This comprehensive analysis clearly documents the broken behavior with negative offsets, provides specific examples, and offers actionable recommendations. The detailed findings will be valuable for understanding the need for the improvements introduced elsewhere in this PR.
src/handlers/filesystem-handlers.ts (1)
170-172: Great improvement to user messaging.The updated message strikes a better balance by confirming successful completion while providing helpful performance guidance. This positive approach aligns well with the updated tool documentation that presents chunking as a standard best practice.
src/server.ts (2)
129-144: Excellent clarification of offset semantics.The enhanced documentation clearly explains the behavior differences between positive and negative offsets with concrete examples. This will help users understand when to use each approach and sets proper expectations for the tail-like behavior of negative offsets.
176-199: Outstanding reframing of chunking as best practice.This documentation update is a significant improvement that proactively guides users toward optimal file writing patterns. By presenting chunking as the standard recommended approach rather than an emergency fallback, users are more likely to adopt these performance best practices from the start.
test/test-negative-offset-readfile.js (5)
28-48: LGTM! Well-structured test setup.The setup function properly saves the original configuration for restoration and creates a predictable test file with numbered lines for easy verification.
53-66: LGTM! Proper cleanup implementation.The teardown function correctly restores the original configuration and handles file cleanup gracefully with appropriate error handling.
71-135: LGTM! Comprehensive negative offset tests.The test cases cover various scenarios including standard negative offsets, edge cases like -1, and beyond-file-size offsets. The expected line verification logic is correct.
197-248: LGTM! Well-designed edge case tests.The edge case tests properly handle scenarios like zero offset, very large negative offsets, and zero-length reads with appropriate success/failure validation.
253-298: LGTM! Excellent test orchestration and module pattern.The test runner properly executes all test suites with comprehensive error handling, cleanup in the finally block, and a clean module pattern that supports both direct execution and importing.
src/tools/filesystem.ts (4)
5-6: LGTM! Necessary imports for streaming functionality.The imports for
createReadStreamandcreateInterfaceare required for the new efficient file reading implementation.
252-297: LGTM! Excellent implementation of smart file reading strategies.The function intelligently selects the most efficient reading strategy based on file size, offset type, and requested lines. The threshold-based approach (10MB for large files, 100 lines for small reads) provides good performance optimization.
299-342: LGTM! Efficient reverse file reading implementation.The function efficiently reads files backwards in 8KB chunks, properly handles partial lines at chunk boundaries, and ensures resource cleanup with the finally block.
591-620: LGTM! Clean implementation for internal file reading.The function properly validates inputs, prevents reading image files for internal text operations, and reuses the smart positioning logic without status messages.
| const negativeLines = negativeContent.split('\n').filter(line => line.startsWith('Line ')); | ||
| const positiveLines = positiveContent.split('\n').filter(line => line.startsWith('Line ')); | ||
|
|
||
| const isMatching = negativeLines.join('\\n') === positiveLines.join('\\n'); |
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Fix the string join to use actual newline character.
The join operation uses escaped newline '\\n' which creates a literal backslash-n string instead of joining with actual newlines.
- const isMatching = negativeLines.join('\\n') === positiveLines.join('\\n');
+ const isMatching = negativeLines.join('\n') === positiveLines.join('\n');📝 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.
| const isMatching = negativeLines.join('\\n') === positiveLines.join('\\n'); | |
| const isMatching = negativeLines.join('\n') === positiveLines.join('\n'); |
🤖 Prompt for AI Agents
In test/test-negative-offset-readfile.js at line 176, the join operation uses
the escaped string '\\n' which results in a literal backslash followed by n
instead of an actual newline character. Replace the string '\\n' with '\n' in
the join method to correctly join the array elements with real newline
characters.
…vements # Conflicts: # test/run-all-tests.js
Summary by CodeRabbit
New Features
Documentation
Bug Fixes
Tests