refactor(crawl): parallel plugins via JobExecutor; per-plugin throttle

- Remove global crawl_slot gate; all CrawlJobs share only executor semaphore
- max_concurrent_jobs = max(24, n_plugins+8) for crawl-all + aggregator headroom
- BaseHTTPPlugin max_concurrency 3->2; fpw multi-URL plugins 4->2
- fetch_all: short random delay before each request to ease single-host pressure

Made-with: Cursor

app/api/lifespan.py

@@ -106,8 +106,10 @@ async def lifespan(app: FastAPI):
         )
         await stack.enter_async_context(worker_pool)
 
-        # Job 执行器
-        executor = JobExecutor(worker_pool=worker_pool, max_concurrent_jobs=10)
+        # Job 执行器：槽位需覆盖「全部爬取」时 N 个 CrawlJob + 聚合任务 + 全量验证等
+        _n_plugins = len(registry.list_plugins())
+        _max_jobs = max(24, _n_plugins + 8)
+        executor = JobExecutor(worker_pool=worker_pool, max_concurrent_jobs=_max_jobs)
         await stack.enter_async_context(executor)
 
         # 插件运行器

app/core/execution/crawl_gate.py

@@ -1,22 +0,0 @@
-"""批量爬取时限制同时发起 HTTP 的插件数，避免 crawl-all 与验证/聚合任务抢满执行器槽位。"""
-import asyncio
-from contextlib import asynccontextmanager
-from typing import AsyncIterator
-
-# 与单插件内 max_concurrency 相乘后仍应对外网友好；过小会拉长总耗时。
-CRAWL_MAX_CONCURRENT = 4
-
-_sem: asyncio.Semaphore | None = None
-
-
-def _get_sem() -> asyncio.Semaphore:
-    global _sem
-    if _sem is None:
-        _sem = asyncio.Semaphore(CRAWL_MAX_CONCURRENT)
-    return _sem
-
-
-@asynccontextmanager
-async def crawl_slot() -> AsyncIterator[None]:
-    async with _get_sem():
-        yield

app/core/execution/executor.py

@@ -1,11 +1,9 @@
 """Job 执行器 - 统一管理所有后台 Job 的生命周期"""
 import asyncio
-from contextlib import asynccontextmanager
 from datetime import datetime, timedelta
 from typing import Any, Dict, List, Optional
 
-from app.core.execution.job import CrawlJob, Job, JobStatus
-from app.core.execution.crawl_gate import crawl_slot
+from app.core.execution.job import Job, JobStatus
 from app.core.execution.worker_pool import AsyncWorkerPool
 from app.core.log import logger
 
@@ -86,12 +84,6 @@ class JobExecutor:
                 logger.error(f"Job {job.id} failed: {e}", exc_info=True)
 
         try:
-            # CrawlJob 先等爬取槽位再占执行器，避免十几个任务占满 max_concurrent_jobs 却只排队等外网
-            if isinstance(job, CrawlJob):
-                async with crawl_slot():
-                    async with self._semaphore:
-                        await _execute()
-            else:
             async with self._semaphore:
                 await _execute()
         finally:

app/plugins/base.py

@@ -26,7 +26,7 @@ class BaseHTTPPlugin(BaseCrawlerPlugin):
         self.urls: List[str] = []
         self.current_url: str = ""
         self._client: Optional[httpx.AsyncClient] = None
-        self.max_concurrency: int = 3
+        self.max_concurrency: int = 2
 
     def get_headers(self) -> dict:
         return {
@@ -178,6 +178,7 @@ class BaseHTTPPlugin(BaseCrawlerPlugin):
 
         async def _fetch_limited(url: str):
             async with semaphore:
+                await asyncio.sleep(random.uniform(0.08, 0.45))
                 return await self.fetch(url, timeout=timeout, retries=retries)
 
         tasks = [_fetch_limited(url) for url in urls]

app/plugins/fpw_proxy_list_download.py

@@ -13,7 +13,7 @@ class FpwProxyListDownloadPlugin(BaseHTTPPlugin):
 
     def __init__(self):
         super().__init__()
-        self.max_concurrency = 4
+        self.max_concurrency = 2
         self.api_pairs = [
             ("http", "https://www.proxy-list.download/api/v1/get?type=http"),
             ("https", "https://www.proxy-list.download/api/v1/get?type=https"),

app/plugins/fpw_socks_ssl_proxy.py

@@ -14,7 +14,7 @@ class FpwSocksSslProxyPlugin(BaseHTTPPlugin):
 
     def __init__(self):
         super().__init__()
-        self.max_concurrency = 4
+        self.max_concurrency = 2
         # 与 sslproxies 同模板的镜像站较多，socks-proxy 在部分网络下不稳定，多源提高成功率
         self.urls = [
             "https://www.sslproxies.org/",