现在官方会对ip地址进行限速，所以增加代理服务器功能

proxy-manager.js

@@ -0,0 +1,56 @@
+import { HttpsProxyAgent } from 'https-proxy-agent';
+import { getProxyConfigs } from './config.js';
+import { logInfo, logError, logDebug } from './logger.js';
+
+let proxyIndex = 0;
+let lastSnapshot = '';
+
+function snapshotConfigs(configs) {
+  try {
+    return JSON.stringify(configs);
+  } catch (error) {
+    logDebug('Failed to snapshot proxy configs', { error: error.message });
+    return '';
+  }
+}
+
+export function getNextProxyAgent(targetUrl) {
+  const proxies = getProxyConfigs();
+
+  if (!Array.isArray(proxies) || proxies.length === 0) {
+    return null;
+  }
+
+  const currentSnapshot = snapshotConfigs(proxies);
+  if (currentSnapshot !== lastSnapshot) {
+    proxyIndex = 0;
+    lastSnapshot = currentSnapshot;
+    logInfo('Proxy configuration changed, round-robin index reset');
+  }
+
+  for (let attempt = 0; attempt < proxies.length; attempt += 1) {
+    const index = (proxyIndex + attempt) % proxies.length;
+    const proxy = proxies[index];
+
+    if (!proxy || typeof proxy.url !== 'string' || proxy.url.trim() === '') {
+      logError('Invalid proxy configuration encountered', new Error(`Proxy entry at index ${index} is missing a url`));
+      continue;
+    }
+
+    try {
+      const agent = new HttpsProxyAgent(proxy.url);
+      proxyIndex = (index + 1) % proxies.length;
+
+      const label = proxy.name || proxy.url;
+      logInfo(`Using proxy ${label} for request to ${targetUrl}`);
+
+      return { agent, proxy };
+    } catch (error) {
+      logError(`Failed to create proxy agent for ${proxy.url}`, error);
+    }
+  }
+
+  logError('All configured proxies failed to initialize', new Error('Proxy initialization failure'));
+  return null;
+}
+