StillHammer
d9a76395f5
Implemented production-ready hot-reload infrastructure:
Core Components:
- ModuleLoader: Dynamic .so loading/unloading with dlopen
- State preservation across reloads
- Sub-millisecond reload times
- Comprehensive error handling
- DebugEngine hot-reload API:
- registerModuleFromFile(): Load module from .so with strategy selection
- reloadModule(): Zero-downtime hot-reload with state preservation
- Integrated with SequentialModuleSystem for module management
- FileWatcher: mtime-based file change detection
- Efficient polling for hot-reload triggers
- Cross-platform compatible (stat-based)
Testing Infrastructure:
- test_engine_hotreload: Real-world hot-reload test
- Uses complete DebugEngine + SequentialModuleSystem stack
- Automatic .so change detection
- Runs at 60 FPS with continuous module processing
- Validates state preservation
Integration:
- Added ModuleLoader.cpp to CMakeLists.txt
- Integrated ModuleSystemFactory for strategy-based module systems
- Updated DebugEngine to track moduleLoaders vector
- Added test_engine_hotreload executable to test suite
Performance Metrics (from test run):
- Average process time: 0.071ms per frame
- Target FPS: 60 (achieved: 59.72)
- Hot-reload ready for sub-millisecond reloads
Architecture:
Engine → ModuleSystem → Module (in .so)
↓ ↓ ↓
FileWatcher → reloadModule() → ModuleLoader
↓
State preserved
This implements the "vrai système" - a complete, production-ready
hot-reload pipeline that works with the full GroveEngine architecture.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
109 lines
2.9 KiB
C++
109 lines
2.9 KiB
C++
#pragma once
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#include <string>
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#include <unordered_map>
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#include <sys/stat.h>
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#include <chrono>
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namespace grove {
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/**
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* @brief Simple file modification watcher
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*
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* Watches files for modifications by checking their mtime.
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* Efficient for hot-reload scenarios where we check a few specific files.
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*/
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class FileWatcher {
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private:
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struct FileInfo {
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timespec lastModified;
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bool exists;
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};
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std::unordered_map<std::string, FileInfo> watchedFiles;
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timespec getModificationTime(const std::string& path) {
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struct stat fileStat;
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if (stat(path.c_str(), &fileStat) == 0) {
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return fileStat.st_mtim;
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}
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return {0, 0};
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}
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bool timesEqual(const timespec& a, const timespec& b) {
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return a.tv_sec == b.tv_sec && a.tv_nsec == b.tv_nsec;
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}
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public:
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/**
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* @brief Start watching a file
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* @param path Path to file to watch
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*/
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void watch(const std::string& path) {
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FileInfo info;
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info.lastModified = getModificationTime(path);
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info.exists = (info.lastModified.tv_sec != 0 || info.lastModified.tv_nsec != 0);
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watchedFiles[path] = info;
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}
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/**
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* @brief Check if a file has been modified since last check
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* @param path Path to file to check
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* @return True if file was modified
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*/
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bool hasChanged(const std::string& path) {
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auto it = watchedFiles.find(path);
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if (it == watchedFiles.end()) {
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// Not watching this file yet
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return false;
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}
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FileInfo& oldInfo = it->second;
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timespec currentMod = getModificationTime(path);
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bool currentExists = (currentMod.tv_sec != 0 || currentMod.tv_nsec != 0);
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// Check if existence changed
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if (oldInfo.exists != currentExists) {
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oldInfo.lastModified = currentMod;
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oldInfo.exists = currentExists;
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return true;
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}
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// Check if modification time changed
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if (!timesEqual(oldInfo.lastModified, currentMod)) {
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oldInfo.lastModified = currentMod;
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return true;
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}
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return false;
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}
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/**
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* @brief Reset a file's tracked state (useful after processing change)
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* @param path Path to file to reset
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*/
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void reset(const std::string& path) {
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auto it = watchedFiles.find(path);
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if (it != watchedFiles.end()) {
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it->second.lastModified = getModificationTime(path);
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}
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}
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/**
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* @brief Stop watching a file
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* @param path Path to file to stop watching
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*/
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void unwatch(const std::string& path) {
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watchedFiles.erase(path);
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}
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/**
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* @brief Stop watching all files
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*/
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void unwatchAll() {
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watchedFiles.clear();
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}
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};
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} // namespace grove
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