@logtape/windows-eventlog/dist/ffi.node.js

Windows Event Log sink for LogTape

import { getLogger } from "@logtape/logtape";

//#region ffi.node.ts
/**
* Node.js FFI implementation for Windows Event Log API using koffi
*/
var WindowsEventLogFFI = class {
	eventSource = null;
	koffi = null;
	sourceName;
	initialized = false;
	lib = null;
	metaLogger = getLogger([
		"logtape",
		"meta",
		"windows-eventlog"
	]);
	constructor(sourceName) {
		this.sourceName = sourceName;
	}
	/**
	* Initialize the FFI bindings and register event source
	*/
	async initialize() {
		if (this.initialized) return;
		try {
			const koffiModule = await import("koffi");
			this.koffi = koffiModule.default || koffiModule;
			this.lib = this.koffi.load("advapi32.dll");
			const RegisterEventSourceA = this.lib.func("uintptr __stdcall RegisterEventSourceA(uintptr lpUNCServerName, str lpSourceName)");
			const ReportEventA = this.lib.func("bool __stdcall ReportEventA(uintptr hEventLog, uint16 wType, uint16 wCategory, uint32 dwEventID, uintptr lpUserSid, uint16 wNumStrings, uint32 dwDataSize, char** lpStrings, uint8* lpRawData)");
			const DeregisterEventSource = this.lib.func("bool __stdcall DeregisterEventSource(uintptr hEventLog)");
			this.RegisterEventSourceA = RegisterEventSourceA;
			this.ReportEventA = ReportEventA;
			this.DeregisterEventSource = DeregisterEventSource;
			this.eventSource = this.RegisterEventSourceA(0, this.sourceName);
			if (!this.eventSource || this.eventSource === 0) throw new Error(`Failed to register event source: ${this.sourceName}`);
			this.initialized = true;
		} catch (error) {
			throw new Error(`Failed to initialize Windows Event Log FFI: ${error}`);
		}
	}
	RegisterEventSourceA = null;
	ReportEventA = null;
	DeregisterEventSource = null;
	/**
	* Write an event to Windows Event Log
	*/
	writeEvent(eventType, eventId, message) {
		if (!this.initialized || !this.eventSource || !this.ReportEventA) return;
		try {
			const messageWithNull = message + "\0";
			const messages = [messageWithNull];
			const success = this.ReportEventA(this.eventSource, eventType, 0, eventId, 0, 1, 0, messages, null);
			if (!success) throw new Error("ReportEventA() returned false.");
		} catch (error) {
			throw error;
		}
	}
	/**
	* Clean up resources
	*/
	dispose() {
		if (this.initialized && this.eventSource && this.DeregisterEventSource) {
			try {
				this.DeregisterEventSource(this.eventSource);
			} catch (error) {
				this.metaLogger.error("Failed to deregister event source during cleanup: {error}", { error });
			}
			this.eventSource = null;
			this.initialized = false;
		}
	}
};

//#endregion
export { WindowsEventLogFFI };
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