Initial commit: mod_reqin_log Apache module

Features:
- JSON logging of HTTP requests to Unix domain socket
- Configurable HTTP headers logging (flat JSON structure)
- Header value truncation and count limits
- Automatic reconnect on socket disconnection
- Error reporting with throttling

Configuration directives:
- JsonSockLogEnabled: Enable/disable logging
- JsonSockLogSocket: Unix socket path
- JsonSockLogHeaders: List of headers to log
- JsonSockLogMaxHeaders: Maximum headers to log
- JsonSockLogMaxHeaderValueLen: Max header value length
- JsonSockLogReconnectInterval: Reconnect delay
- JsonSockLogErrorReportInterval: Error log throttle

Includes:
- Module source code (src/)
- Unit and integration tests (tests/, scripts/)
- Documentation (README.md, architecture.yml)
- Build configuration (CMakeLists.txt, Makefile)
- Packaging (deb/rpm)

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

Makefile

@@ -0,0 +1,86 @@
+# Makefile for mod_reqin_log
+# Apache HTTPD module for logging HTTP requests as JSON to Unix socket
+
+# APXS tool path (can be overridden)
+APXS ?= apxs
+
+# Compiler settings
+CC ?= gcc
+CFLAGS ?= -Wall -Wextra -O2
+
+# Directories
+SRC_DIR = src
+BUILD_DIR = build
+INSTALL_DIR = modules
+
+# Source files
+SRCS = $(SRC_DIR)/mod_reqin_log.c
+
+# Module name
+MODULE_NAME = mod_reqin_log
+
+.PHONY: all clean install uninstall test
+
+all: $(MODULE_NAME).so
+
+# Build the module using apxs
+# Note: Use -Wc to pass flags to the C compiler through apxs
+$(MODULE_NAME).so: $(SRCS)
+	@mkdir -p $(BUILD_DIR)
+	$(APXS) -c -Wc,"$(CFLAGS)" -o $(BUILD_DIR)/$(MODULE_NAME).so $(SRCS)
+	@mkdir -p $(INSTALL_DIR)
+	@if [ -f $(BUILD_DIR)/.libs/$(MODULE_NAME).so ]; then \
+		cp $(BUILD_DIR)/.libs/$(MODULE_NAME).so $(INSTALL_DIR)/; \
+	elif [ -f $(BUILD_DIR)/$(MODULE_NAME).so ]; then \
+		cp $(BUILD_DIR)/$(MODULE_NAME).so $(INSTALL_DIR)/; \
+	fi
+
+# Install the module
+install: $(MODULE_NAME).so
+	@echo "Installing $(MODULE_NAME).so..."
+	@mkdir -p $(DESTDIR)/usr/lib/apache2/modules
+	cp $(BUILD_DIR)/$(MODULE_NAME).so $(DESTDIR)/usr/lib/apache2/modules/
+	@echo "Installation complete."
+	@echo "Enable the module by adding to your httpd.conf:"
+	@echo "  LoadModule reqin_log_module modules/mod_reqin_log.so"
+
+# Uninstall the module
+uninstall:
+	rm -f $(DESTDIR)/usr/lib/apache2/modules/$(MODULE_NAME).so
+	@echo "Uninstallation complete."
+
+# Clean build artifacts
+clean:
+	rm -rf $(BUILD_DIR) $(INSTALL_DIR)
+	rm -f .libs/*.o .libs/*.la .libs/*.so
+	rm -f *.o *.la *.lo
+	rm -rf .libs
+
+# Run unit tests (requires cmocka)
+test:
+	@mkdir -p build/tests
+	cd build/tests && cmake ../../ -DCMAKE_BUILD_TYPE=Debug
+	$(MAKE) -C build/tests run_tests
+
+# Build with debug symbols
+debug: CFLAGS += -g -DDEBUG
+debug: clean all
+
+# Help target
+help:
+	@echo "mod_reqin_log Makefile"
+	@echo ""
+	@echo "Targets:"
+	@echo "  all      - Build the module (default)"
+	@echo "  install  - Install the module to DESTDIR"
+	@echo "  uninstall- Remove the module from DESTDIR"
+	@echo "  clean    - Remove build artifacts"
+	@echo "  test     - Run unit tests"
+	@echo "  debug    - Build with debug symbols"
+	@echo "  help     - Show this help message"
+	@echo ""
+	@echo "Variables:"
+	@echo "  APXS     - Path to apxs tool (default: apxs)"
+	@echo "  CC       - C compiler (default: gcc)"
+	@echo "  CFLAGS   - Compiler flags (default: -Wall -Wextra -O2)"
+	@echo "  DESTDIR  - Installation destination (default: /)"