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

Windows Event Log sink for LogTape

import { getLogger } from "@logtape/logtape";
import { FFIType, dlopen, ptr } from "bun:ffi";

//#region ffi.bun.ts
/**
* Bun FFI implementation for Windows Event Log API
*/
var WindowsEventLogFFI = class {
	eventSource = null;
	lib = null;
	sourceName;
	initialized = false;
	metaLogger = getLogger([
		"logtape",
		"meta",
		"windows-eventlog"
	]);
	constructor(sourceName) {
		this.sourceName = sourceName;
	}
	/**
	* Initialize the FFI bindings and register event source
	*/
	initialize() {
		if (this.initialized) return;
		try {
			this.lib = dlopen("advapi32.dll", {
				RegisterEventSourceA: {
					args: [FFIType.ptr, FFIType.cstring],
					returns: FFIType.ptr
				},
				ReportEventA: {
					args: [
						FFIType.ptr,
						FFIType.u16,
						FFIType.u16,
						FFIType.u32,
						FFIType.ptr,
						FFIType.u16,
						FFIType.u32,
						FFIType.ptr,
						FFIType.ptr
					],
					returns: FFIType.bool
				},
				DeregisterEventSource: {
					args: [FFIType.ptr],
					returns: FFIType.bool
				}
			});
			const encoder = new TextEncoder();
			const sourceNameBuffer = encoder.encode(this.sourceName + "\0");
			const result = this.lib.symbols.RegisterEventSourceA(null, sourceNameBuffer);
			this.eventSource = typeof result === "number" ? result : null;
			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}`);
		}
	}
	/**
	* Write an event to Windows Event Log
	*/
	writeEvent(eventType, eventId, message) {
		if (!this.initialized || !this.eventSource || !this.lib) return;
		try {
			const encoder = new TextEncoder();
			const messageBuffer = encoder.encode(message + "\0");
			const ptrArray = new BigUint64Array(2);
			ptrArray[0] = BigInt(ptr(messageBuffer));
			ptrArray[1] = 0n;
			const success = this.lib.symbols.ReportEventA(this.eventSource, eventType, 0, eventId, null, 1, 0, ptrArray, null);
			if (!success) throw new Error(`ReportEventA returned false`);
		} catch (error) {
			throw error;
		}
	}
	/**
	* Clean up resources
	*/
	dispose() {
		if (this.initialized && this.eventSource && this.lib) {
			try {
				this.lib.symbols.DeregisterEventSource(this.eventSource);
			} catch (error) {
				this.metaLogger.error("Failed to deregister event source during cleanup: {error}", { error });
			}
			this.eventSource = null;
			this.initialized = false;
			try {
				this.lib.close();
			} catch (error) {
				this.metaLogger.error("Failed to close FFI library during cleanup: {error}", { error });
			}
			this.lib = null;
		}
	}
};

//#endregion
export { WindowsEventLogFFI };
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