chore: hapus fitur IPv6 source rotation

- Hapus src/lib/ipv6-pool.ts dan test - Hapus fetchViaCurl() dari fetch-utils.ts - Hapus parameter ipv6Source dari router, ai-proxy, anthropic-proxy - Hapus ipv6Only: false dari Bun.serve(), default bind ke 0.0.0.0 - Hapus dokumentasi IPv6 dari CLAUDE.md dan README.md - SSRF protection untuk IPv6 private/loopback tetap ada Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-27 12:10:25 +07:00
parent 9a379d09b5
commit f78f1f5bbf
8 changed files with 25 additions and 581 deletions
@@ -5,7 +5,6 @@
 * Adds:
 *   - Bun.serve() bindings
 *   - WebSocket relay support
- *   - IPv6 source rotation
 *   - Proxy pool file loading
 *   - Graceful shutdown
 */
@@ -25,7 +24,6 @@ import {
 } from "./lib/router";
 import type { RouterEnv } from "./lib/router";

-import { IPv6SourcePool } from "./lib/ipv6-pool";
 import { closeAllActiveReaders, isDevMode } from "./lib/fetch-utils";

 import type { Server, ServerWebSocket } from "bun";
@@ -34,7 +32,7 @@ import type { Server, ServerWebSocket } from "bun";

 const RELAY_VERSION = "1.0.0";
 const PORT = Number.parseInt(process.env.PORT ?? "3000", 10);
-const HOST = process.env.HOST ?? "::";
+const HOST = process.env.HOST ?? "0.0.0.0";

 // --- Proxy pool (optional) ----------------------------------------------------

@@ -43,14 +41,6 @@ proxyPool.tryLoad(
 	process.env.PROXY_FILE || process.env.PROXY_LIST || "./proxy.txt",
 );

-// --- IPv6 source pool (optional) ----------------------------------------------
-
-const ipv6Pool = new IPv6SourcePool();
-ipv6Pool.loadFromEnv();
-if (ipv6Pool.configured) {
-	console.log(`[relay] IPv6 source pool loaded: ${ipv6Pool.size} addresses`);
-}
-
 // --- SSRF DNS rebinding protection --------------------------------------------

 if (process.env.SSRF_DNS_CHECK === "true") {
@@ -116,13 +106,11 @@ function handleWebSocketUpgrade(

 const server: Server<WSRelayData> = Bun.serve<WSRelayData>({
 	hostname: HOST,
-	ipv6Only: false,
 	port: PORT,
 	development: isDevMode() ? { hmr: true, console: true } : undefined,

 	async fetch(req: Request): Promise<Response | undefined> {
 		const url = new URL(req.url);
-		const ipv6Source = ipv6Pool.getNext() ?? undefined;

 		// Static routes
 		if (url.pathname === "/health") return handleHealth();
@@ -157,10 +145,7 @@ const server: Server<WSRelayData> = Bun.serve<WSRelayData>({
 			req,
 			routerEnv,
 			clientIP,
-			{
-				isWebSocketSupported: true,
-				ipv6Source,
-			},
+			{ isWebSocketSupported: true },
 		);
 		if (result !== undefined) return result;

@@ -407,14 +407,6 @@ export async function handleChatCompletion(
 	proxyPool?: ProxyPool,
 	sessionPool?: SessionProxyPool,
 	sessionId?: string,
-	ipv6Source?: string,
-): Promise<Response>;
-export async function handleChatCompletion(
-	body: unknown,
-	proxyPool?: ProxyPool,
-	sessionPool?: SessionProxyPool,
-	sessionId?: string,
-	ipv6Source?: string,
 ): Promise<Response> {
 	// -- Input validation -------------------------------------------------------
 	const validationError = validateChatRequest(body);
@@ -457,8 +449,8 @@ export async function handleChatCompletion(
 	// -- Execute with session-aware or standard retry --------------------------
 	let result: FetchWithRetryResult =
 		sessionPool && sessionId
-			? await fetchWithSessionRetry(url, init, sessionPool, sessionId, `openai:${req.model}`, undefined, ipv6Source)
-			: await fetchWithRetry(url, init, proxyPool, `openai:${req.model}`, ipv6Source);
+			? await fetchWithSessionRetry(url, init, sessionPool, sessionId, `openai:${req.model}`, undefined)
+			: await fetchWithRetry(url, init, proxyPool, `openai:${req.model}`);

 	// -- Mimo Free: auth failure → invalidate JWT and retry once ---------------
 	if (
@@ -474,8 +466,8 @@ export async function handleChatCompletion(
 		};
 		result =
 			sessionPool && sessionId
-				? await fetchWithSessionRetry(url, init, sessionPool, sessionId, `openai:${req.model}`, undefined, ipv6Source)
-				: await fetchWithRetry(url, init, proxyPool, `openai:${req.model}`, ipv6Source);
+				? await fetchWithSessionRetry(url, init, sessionPool, sessionId, `openai:${req.model}`, undefined)
+				: await fetchWithRetry(url, init, proxyPool, `openai:${req.model}`);
 	}

 	if (result.errorClassification) {
@@ -1034,22 +1034,6 @@ export async function handleAnthropicMessages(
 	proxyPool?: ProxyPool,
 	sessionPool?: SessionProxyPool,
 	sessionId?: string,
-	ipv6Source?: string,
-): Promise<Response>;
-export async function handleAnthropicMessages(
-	body: unknown,
-	proxyPool?: ProxyPool,
-	sessionPool?: SessionProxyPool,
-	sessionId?: string,
-	ipv6Source?: string,
-	anthropicVersion?: string,
-): Promise<Response>;
-export async function handleAnthropicMessages(
-	body: unknown,
-	proxyPool?: ProxyPool,
-	sessionPool?: SessionProxyPool,
-	sessionId?: string,
-	ipv6Source?: string,
 	anthropicVersion?: string,
 ): Promise<Response> {
 	// -- Input validation -------------------------------------------------------
@@ -1091,8 +1075,8 @@ export async function handleAnthropicMessages(
 	// -- Execute with session-aware or standard retry --------------------------
 	const result: FetchWithRetryResult =
 		sessionPool && sessionId
-			? await fetchWithSessionRetry(url, init, sessionPool, sessionId, `anthropic:${req.model}`, undefined, ipv6Source)
-			: await fetchWithRetry(url, init, proxyPool, `anthropic:${req.model}`, ipv6Source);
+			? await fetchWithSessionRetry(url, init, sessionPool, sessionId, `anthropic:${req.model}`, undefined)
+			: await fetchWithRetry(url, init, proxyPool, `anthropic:${req.model}`);

 	if (result.errorClassification) {
 		if (sessionPool && sessionId) sessionPool.release(sessionId);
@@ -6,13 +6,6 @@
 */

 import type { ProxyPool, SessionProxyPool } from "./proxy-pool";
-import type { IPv6SourcePool } from "./ipv6-pool";
-import { unlink } from "node:fs/promises";
-
-// ─── Constants ─────────────────────────────────────────────────────────
-
-/** Default relay timeout (30 seconds). Used for curl IPv6 source requests. */
-const DEFAULT_TIMEOUT_MS = 30_000;

 // ─── Active stream tracking (for graceful shutdown) ───────────────────────

@@ -129,7 +122,7 @@ export class SSELineBuffer {
    if (this.overflow) return [];

    this.buffer += chunk;
-    
+
    if (this.buffer.length > this.MAX_BUFFER_SIZE) {
      console.warn(`[SSELineBuffer] Buffer exceeded ${this.MAX_BUFFER_SIZE} bytes — discarding remaining stream data`);
      this.overflow = true;
@@ -219,142 +212,11 @@ export function sanitizeErrorMessage(raw: string): string {
  return "Upstream error";
 }

-// ─── Fetch via curl (for IPv6 source binding) ────────────────────────────
-
-/**
- * Execute an HTTP request via curl with a specific source IPv6 address.
- * Uses `Bun.spawn` to run curl with `--interface` to bind to the given address.
- *
- * This is used when outbound IPv6 source rotation is needed, since
- * Bun's built-in fetch() does not support specifying a local address.
- *
- * Status code is extracted from a temp file written by curl's `-w` flag
- * (written after body completes). The body is collected into a single
- * buffer and returned as a ReadableStream for zero-copy handoff.
- *
- * @param url - Target URL
- * @param init - Request init (method, headers, body)
- * @param ipv6Source - IPv6 source address to bind to
- * @param timeoutMs - Request timeout in milliseconds
- */
-export async function fetchViaCurl(
-	url: string,
-	init: RequestInit,
-	ipv6Source: string,
-	timeoutMs: number,
-): Promise<Response> {
-	const method = (init.method ?? "GET").toUpperCase();
-
-	const statusFile = `/tmp/curl-status-${crypto.randomUUID().slice(0, 8)}`;
-	const args = [
-		"curl",
-		"-6",
-		"--interface", ipv6Source,
-		"-X", method,
-		"-s",           // silent mode
-		"--compressed", // auto-decompress gzip/brotli
-		"-o", "-",      // output body to stdout
-		"-w", statusFile, // write status code to file (plain text, appended after body)
-		"--max-time", String(Math.ceil(timeoutMs / 1000)),
-		"--connect-timeout", "10",
-	];
-
-	// Add headers
-	if (init.headers) {
-		const headers = init.headers instanceof Headers
-			? Object.fromEntries(init.headers.entries())
-			: init.headers;
-		for (const [key, value] of Object.entries(headers)) {
-			if (key.toLowerCase() === "host") continue;
-			args.push("-H", `${key}: ${value}`);
-		}
-	}
-
-	// Add body for non-GET/HEAD methods
-	if (init.body && method !== "GET" && method !== "HEAD") {
-		if (typeof init.body === "string") {
-			args.push("-d", init.body);
-		} else if (init.body instanceof ArrayBuffer) {
-			args.push("--data-binary", "@-");
-		}
-	}
-
-	args.push(url);
-
-	logProxy("fetchViaCurl", `${args.slice(0, 6).join(" ")}...`, { ipv6Source, url });
-
-	const proc = Bun.spawn(args, {
-		stdout: "pipe",
-		stderr: "pipe",
-		stdin: "pipe",
-	});
-
-	// Kill process after timeout + buffer
-	const killTimer = setTimeout(() => {
-		try { proc.kill("SIGKILL"); } catch { /* already dead */ }
-	}, timeoutMs + 5000);
-
-	// Collect stdout into minimal chunks then concatenate into a single buffer.
-	// This is needed because curl's -w (status code) is written AFTER the body
-	// completes, so we must wait for proc.exited before reading the status file.
-	// We minimize peak memory by streaming chunks into a pre-allocated buffer.
-	const stdoutChunks: Uint8Array[] = [];
-	const stdoutReader = proc.stdout.getReader();
-	try {
-		while (true) {
-			const { done, value } = await stdoutReader.read();
-			if (done) break;
-			stdoutChunks.push(value);
-		}
-	} catch { /* stream cancelled */ }
-
-	// Wait for process to exit, then read status code
-	await proc.exited;
-	clearTimeout(killTimer);
-
-	let statusCode = 502;
-	try {
-		const statusText = await Bun.file(statusFile).text();
-		statusCode = parseInt(statusText.trim(), 10) || 502;
-	} catch {
-		// Status file not written — connection likely failed
-	}
-
-	// Clean up temp file (async, non-blocking)
-	unlink(statusFile).catch(() => {});
-
-	logProxy("fetchViaCurl", `response status=${statusCode}`, { ipv6Source, url });
-
-	// Concatenate chunks into a single buffer for the Response body stream.
-	// Uses a single allocation to reduce GC pressure from many small chunks.
-	const totalLength = stdoutChunks.reduce((sum, c) => sum + c.byteLength, 0);
-	const combined = new Uint8Array(totalLength);
-	let offset = 0;
-	for (const chunk of stdoutChunks) {
-		combined.set(chunk, offset);
-		offset += chunk.byteLength;
-	}
-
-	// Zero-copy: hand the buffer directly to ReadableStream
-	const bodyStream = new ReadableStream({
-		start(controller) {
-			controller.enqueue(combined);
-			controller.close();
-		},
-	});
-
-	return new Response(bodyStream, {
-		status: statusCode,
-		statusText: statusCode === 200 ? "OK" : "Error",
-		headers: { "Content-Type": "text/plain" },
-	});
-}
-
 // ─── Fetch with retry (direct → proxy fallback) ─────────────────────────

 export interface FetchWithRetryResult {
-	response?: Response;
-	errorClassification?: { code: string; status: number; message: string };
+  response?: Response;
+  errorClassification?: { code: string; status: number; message: string };
 }

 /**
@@ -364,17 +226,12 @@ export interface FetchWithRetryResult {
 * Falls back to direct when no pool is available.
 * Logs every failure to `console.warn` so the operator can diagnose without
 * the error body leaking to the downstream client.
- *
- * @param ipv6Source - Optional IPv6 source address for outbound binding.
- *                     When provided, uses curl instead of fetch() to bind
- *                     to the specified source address.
 */
 export async function fetchWithRetry(
-	url: string,
-	init: RequestInit & { proxy?: string },
-	proxyPool?: ProxyPool,
-	context?: string,
-	ipv6Source?: string,
+  url: string,
+  init: RequestInit & { proxy?: string },
+  proxyPool?: ProxyPool,
+  context?: string,
 ): Promise<FetchWithRetryResult> {
  let response: Response | undefined;
  let lastError: unknown;
@@ -419,22 +276,9 @@ export async function fetchWithRetry(
    const proxyShort = init.proxy ? init.proxy.replace(/https?:\/\//, "").replace(/@.*/, "@***") : "direct";
    logProxy("fetchWithRetry", `attempt=${attempt + 1}/${maxAttempts} proxy=${proxyShort}`, { context });

-	try {
-			// Use curl for IPv6 source binding (only for direct connections)
-			if (ipv6Source && !init.proxy) {
-				response = await fetchViaCurl(url, init, ipv6Source, DEFAULT_TIMEOUT_MS);
-				// If curl failed with connection error (502, empty body), fallback to regular fetch
-				if (response.status === 502) {
-					const cloned = response.clone();
-					const bodyText = await cloned.text();
-					if (!bodyText) {
-						logProxy("fetchWithRetry", `IPv6 connection failed, falling back to regular fetch`, { ipv6Source, url });
-						response = await fetch(url, init);
-					}
-				}
-			} else {
-				response = await fetch(url, init);
-			}
+    try {
+      response = await fetch(url, init);
+
      if (response.ok) {
        if (usedProxy && proxyPool && proxyPool.size > 0) {
          proxyPool.markSuccess();
@@ -542,8 +386,6 @@ function classifyFetchErrorSafe(error: unknown): {
 * SSE streams: the initial request is retried normally. Once the response body
 * starts streaming, mid-stream errors are **not** retried; the session is
 * released and the error is returned to the caller.
- *
- * @param ipv6Source - Optional IPv6 source address for outbound binding.
 */
 export async function fetchWithSessionRetry(
  url: string,
@@ -552,18 +394,12 @@ export async function fetchWithSessionRetry(
  sessionId: string,
  context?: string,
  maxRetries?: number,
-  ipv6Source?: string,
 ): Promise<FetchWithRetryResult> {
  // Fallback when no session pool is available
  if (!sessionPool) {
    logProxy("fetchWithSessionRetry", "no session pool — direct fetch", { context, sessionId: sessionId.slice(0, 8) });
    try {
-      let response: Response;
-      if (ipv6Source) {
-        response = await fetchViaCurl(url, init, ipv6Source, DEFAULT_TIMEOUT_MS);
-      } else {
-        response = await fetch(url, init);
-      }
+      const response = await fetch(url, init);
      return { response };
    } catch (err) {
      return { errorClassification: classifyFetchErrorSafe(err) };
@@ -620,13 +456,7 @@ export async function fetchWithSessionRetry(
    });

    try {
-      // Use curl for IPv6 source binding (only for direct connections)
-      let response: Response;
-      if (ipv6Source && !init.proxy) {
-        response = await fetchViaCurl(url, init, ipv6Source, DEFAULT_TIMEOUT_MS);
-      } else {
-        response = await fetch(url, init);
-      }
+      const response = await fetch(url, init);

      if (response.ok) {
        sessionPool.markSuccess(sessionId);
@@ -650,7 +480,7 @@ export async function fetchWithSessionRetry(
          context,
          sessionId: sessionId.slice(0, 8),
        });
-        const rotated = sessionPool.rotateNow(sessionId, model);
+        sessionPool.rotateNow(sessionId, model);
        continue;
      }

@@ -1,118 +0,0 @@
-import { test, expect, describe } from "bun:test";
-import { IPv6SourcePool } from "./ipv6-pool";
-
-describe("IPv6SourcePool", () => {
-	test("should load addresses from comma-separated string", () => {
-		const pool = new IPv6SourcePool();
-		pool.loadFromString("2001:db8::1,2001:db8::2,2001:db8::3");
-
-		expect(pool.size).toBe(3);
-		expect(pool.configured).toBe(true);
-	});
-
-	test("should return null when empty", () => {
-		const pool = new IPv6SourcePool();
-		expect(pool.size).toBe(0);
-		expect(pool.configured).toBe(false);
-		expect(pool.getNext()).toBeNull();
-	});
-
-	test("should rotate through addresses round-robin", () => {
-		const pool = new IPv6SourcePool();
-		pool.loadFromString("2001:db8::1,2001:db8::2,2001:db8::3");
-
-		expect(pool.getNext()).toBe("2001:db8::1");
-		expect(pool.getNext()).toBe("2001:db8::2");
-		expect(pool.getNext()).toBe("2001:db8::3");
-		expect(pool.getNext()).toBe("2001:db8::1"); // wraps around
-	});
-
-	test("should skip failed sources", () => {
-		const pool = new IPv6SourcePool();
-		pool.loadFromString("2001:db8::1,2001:db8::2,2001:db8::3");
-		pool.setFailureThreshold(1);
-
-		pool.markFailed("2001:db8::2");
-
-		const results = [pool.getNext(), pool.getNext(), pool.getNext(), pool.getNext()];
-		// Should skip 2001:db8::2 (disabled after 1 failure with threshold=1)
-		expect(results).not.toContain("2001:db8::2");
-	});
-
-	test("should reset after all sources fail", () => {
-		const pool = new IPv6SourcePool();
-		pool.loadFromString("2001:db8::1,2001:db8::2");
-
-		// Mark all as failed
-		pool.markFailed("2001:db8::1");
-		pool.markFailed("2001:db8::1");
-		pool.markFailed("2001:db8::1");
-		pool.markFailed("2001:db8::2");
-		pool.markFailed("2001:db8::2");
-		pool.markFailed("2001:db8::2");
-
-		// Should auto-reset and return first
-		const addr = pool.getNext();
-		expect(addr).toBe("2001:db8::1");
-	});
-
-	test("should reset failure count on success", () => {
-		const pool = new IPv6SourcePool();
-		pool.loadFromString("2001:db8::1,2001:db8::2");
-
-		pool.markFailed("2001:db8::1");
-		pool.markFailed("2001:db8::1");
-		pool.markSuccess("2001:db8::1");
-
-		// Should not be disabled after success
-		const addr = pool.getNext();
-		expect(addr).toBe("2001:db8::1");
-	});
-
-	test("should get address by index", () => {
-		const pool = new IPv6SourcePool();
-		pool.loadFromString("2001:db8::1,2001:db8::2");
-
-		expect(pool.getAtIndex(0)).toBe("2001:db8::1");
-		expect(pool.getAtIndex(1)).toBe("2001:db8::2");
-		expect(pool.getAtIndex(2)).toBeNull();
-	});
-
-	test("should handle whitespace in input", () => {
-		const pool = new IPv6SourcePool();
-		pool.loadFromString("  2001:db8::1 , 2001:db8::2  ");
-
-		expect(pool.size).toBe(2);
-		expect(pool.getNext()).toBe("2001:db8::1");
-	});
-
-	test("should handle empty input", () => {
-		const pool = new IPv6SourcePool();
-		pool.loadFromString("");
-		expect(pool.size).toBe(0);
-	});
-
-	test("should reset all sources", () => {
-		const pool = new IPv6SourcePool();
-		pool.loadFromString("2001:db8::1,2001:db8::2");
-
-		pool.markFailed("2001:db8::1");
-		pool.markFailed("2001:db8::1");
-		pool.markFailed("2001:db8::1");
-		pool.reset();
-
-		expect(pool.getNext()).toBe("2001:db8::1");
-	});
-
-	test("should change failure threshold", () => {
-		const pool = new IPv6SourcePool();
-		pool.loadFromString("2001:db8::1");
-		pool.setFailureThreshold(1);
-
-		pool.markFailed("2001:db8::1");
-		// With threshold 1, should be disabled after 1 failure
-		// getNext should auto-reset since all failed
-		const addr = pool.getNext();
-		expect(addr).toBe("2001:db8::1");
-	});
-});
@@ -1,186 +0,0 @@
-/**
- * IPv6 source address pool for outbound rotation.
- *
- * Loads multiple IPv6 source addresses and rotates through them
- * round-robin. Each outbound request can pick the next source IP
- * via getNext(), ensuring requests are distributed across addresses.
- *
- * --- Environment Variables ----------------------------------------------------
- * IPV6_SOURCES — Comma-separated list of IPv6 source addresses
- *                e.g. "2001:df4:c140:1f::d6,2001:df4:c140:1f:ffff:ffff:ffff:ffff"
- */
-
-const POOL_PREFIX = "[ipv6-pool]";
-
-function logPool(msg: string, extra?: Record<string, unknown>): void {
-	const ts = new Date().toISOString().slice(11, 23);
-	const parts = [`${POOL_PREFIX} ${ts}`, msg];
-	if (extra) {
-		for (const [k, v] of Object.entries(extra)) {
-			parts.push(`${k}=${v ?? "null"}`);
-		}
-	}
-	console.log(parts.join(" "));
-}
-
-// --- Types -------------------------------------------------------------------
-
-export interface IPv6SourceEntry {
-	address: string;
-	/** Number of consecutive failures for this source */
-	failures: number;
-	/** Whether this source is temporarily disabled */
-	disabled: boolean;
-}
-
-// --- IPv6SourcePool ----------------------------------------------------------
-
-export class IPv6SourcePool {
-	private sources: IPv6SourceEntry[] = [];
-	private currentIndex = 0;
-	private failureThreshold = 3;
-
-	/**
-	 * Load IPv6 source addresses from a comma-separated string.
-	 *
-	 * @param csv - Comma-separated IPv6 addresses (e.g. "addr1,addr2,addr3")
-	 */
-	loadFromString(csv: string): void {
-		if (!csv) return;
-		const addrs = csv
-			.split(",")
-			.map((a) => a.trim())
-			.filter(Boolean);
-
-		this.sources = addrs.map((addr) => ({
-			address: addr,
-			failures: 0,
-			disabled: false,
-		}));
-		this.currentIndex = 0;
-
-		logPool(`loaded ${this.sources.length} IPv6 source addresses`);
-		for (const src of this.sources) {
-			logPool(`  source: ${src.address}`);
-		}
-	}
-
-	/**
-	 * Load from environment variable IPV6_SOURCES.
-	 */
-	loadFromEnv(): void {
-		const env = process.env.IPV6_SOURCES;
-		if (env) {
-			this.loadFromString(env);
-		}
-	}
-
-	// -- Access ------------------------------------------------------------------
-
-	/** Total number of source addresses. */
-	get size(): number {
-		return this.sources.length;
-	}
-
-	/** Whether any source addresses are configured. */
-	get configured(): boolean {
-		return this.sources.length > 0;
-	}
-
-	/**
-	 * Get the next IPv6 source address (round-robin).
-	 * Skips sources that have exceeded the failure threshold.
-	 *
-	 * @returns The next IPv6 address, or null if pool is empty or all failed.
-	 */
-	getNext(): string | null {
-		if (this.sources.length === 0) return null;
-
-		const startIndex = this.currentIndex;
-		let checked = 0;
-
-		do {
-			const entry = this.sources[this.currentIndex];
-			if (entry && !entry.disabled) {
-				const addr = entry.address;
-				// Advance index for next call
-				this.currentIndex = (this.currentIndex + 1) % this.sources.length;
-				logPool(`getNext -> ${addr} (index=${this.currentIndex})`);
-				return addr;
-			}
-			this.currentIndex = (this.currentIndex + 1) % this.sources.length;
-			checked++;
-		} while (this.currentIndex !== startIndex && checked <= this.sources.length);
-
-		// All sources failed — reset and return first
-		logPool("all IPv6 sources failed, resetting");
-		for (const src of this.sources) {
-			src.failures = 0;
-			src.disabled = false;
-		}
-		this.currentIndex = 0;
-		return this.sources[0]?.address ?? null;
-	}
-
-	/**
-	 * Get a specific source address by index.
-	 * Returns null if out of bounds.
-	 */
-	getAtIndex(index: number): string | null {
-		return this.sources[index]?.address ?? null;
-	}
-
-	// -- Failure tracking --------------------------------------------------------
-
-	/**
-	 * Mark a source address as failed.
-	 * If failures exceed threshold, the source is disabled until reset.
-	 *
-	 * @param address - The IPv6 address that failed
-	 */
-	markFailed(address: string): void {
-		const entry = this.sources.find((s) => s.address === address);
-		if (!entry) return;
-
-		entry.failures++;
-		logPool(`markFailed ${address} (${entry.failures}/${this.failureThreshold})`);
-
-		if (entry.failures >= this.failureThreshold) {
-			entry.disabled = true;
-			console.warn(
-				`[ipv6-pool] Source ${address} failed ${entry.failures}/${this.failureThreshold} times — disabled`,
-			);
-		}
-	}
-
-	/**
-	 * Mark a source address as successful (resets failure count).
-	 *
-	 * @param address - The IPv6 address that succeeded
-	 */
-	markSuccess(address: string): void {
-		const entry = this.sources.find((s) => s.address === address);
-		if (!entry) return;
-
-		if (entry.failures > 0) {
-			logPool(`markSuccess ${address} (was ${entry.failures} failures)`);
-		}
-		entry.failures = 0;
-		entry.disabled = false;
-	}
-
-	/** Set the failure threshold (default 3). */
-	setFailureThreshold(n: number): void {
-		this.failureThreshold = n;
-	}
-
-	/** Reset all failure states. */
-	reset(): void {
-		for (const src of this.sources) {
-			src.failures = 0;
-			src.disabled = false;
-		}
-		this.currentIndex = 0;
-		logPool("reset all sources");
-	}
-}
@@ -558,7 +558,7 @@ async function handleRelay(
 	req: Request,
 	env: RouterEnv,
 	clientIP: string,
-	extra?: { ipv6Source?: string; skipProxyPool?: boolean },
+	extra?: { skipProxyPool?: boolean },
 ): Promise<Response> {
 	const startTime = performance.now();
 	const method = req.method;
@@ -603,7 +603,7 @@ async function handleRelay(
 	const result = await fetchWithRetry(
 		targetUrlString, fetchOptions,
 		extra?.skipProxyPool ? undefined : proxyPool!,
-		"relay", extra?.ipv6Source,
+		"relay",
 	);

 	if (result.errorClassification) {
@@ -678,7 +678,6 @@ export interface RouterOptions {
 	isWebSocketSupported?: boolean;
 	getTestApiHtml?: () => string | Promise<string>;
 	skipProxyPool?: boolean;
-	ipv6Source?: string;
 }

 async function handleRequest(
@@ -707,7 +706,7 @@ async function handleRequest(
 		if (authErr) return authErr;
 		try {
 			const body = await req.json();
-			return await handleChatCompletion(body, proxyPool ?? undefined, sessionPool ?? undefined, crypto.randomUUID(), options.ipv6Source);
+			return await handleChatCompletion(body, proxyPool ?? undefined, sessionPool ?? undefined, crypto.randomUUID());
 		} catch (err) {
 			return createJsonErrorResponse(err);
 		}
@@ -722,7 +721,7 @@ async function handleRequest(
 		try {
 			const body = await req.json();
 			const anthropicVersion = req.headers.get("anthropic-version") ?? undefined;
-			return await handleAnthropicMessages(body, proxyPool ?? undefined, sessionPool ?? undefined, crypto.randomUUID(), options.ipv6Source, anthropicVersion);
+			return await handleAnthropicMessages(body, proxyPool ?? undefined, sessionPool ?? undefined, crypto.randomUUID(), anthropicVersion);
 		} catch (err) {
 			return createAnthropicJsonErrorResponse(err);
 		}
@@ -755,7 +754,6 @@ async function handleRequest(

 	// Generic HTTP relay
 	return handleRelay(req, env, clientIP, {
-		ipv6Source: options.ipv6Source,
 		skipProxyPool: options.skipProxyPool,
 	});
 }