From df112a3996fd872b1f6e3fff4a9b989ed4d0aaea Mon Sep 17 00:00:00 2001
From: Andrey Rakhmatullin <wrar@wrar.name>
Date: Tue, 5 Sep 2023 19:43:08 +0400
Subject: [PATCH] Move reactor installation into Crawler.crawl().

---
 scrapy/crawler.py | 33 ++++++++++++++++++---------------
 1 file changed, 18 insertions(+), 15 deletions(-)

diff --git a/scrapy/crawler.py b/scrapy/crawler.py
index ec853e0d8..44ffc44ce 100644
--- a/scrapy/crawler.py
+++ b/scrapy/crawler.py
@@ -104,20 +104,7 @@ class Crawler:
             crawler=self,
         )
 
-        reactor_class: str = self.settings["TWISTED_REACTOR"]
-        event_loop: str = self.settings["ASYNCIO_EVENT_LOOP"]
-        if init_reactor:
-            # this needs to be done after the spider settings are merged,
-            # but before something imports twisted.internet.reactor
-            if reactor_class:
-                install_reactor(reactor_class, event_loop)
-            else:
-                from twisted.internet import reactor  # noqa: F401
-            log_reactor_info()
-        if reactor_class:
-            verify_installed_reactor(reactor_class)
-            if is_asyncio_reactor_installed() and event_loop:
-                verify_installed_asyncio_event_loop(event_loop)
+        self._init_reactor = init_reactor
 
         self.crawling: bool = False
         self.spider: Optional[Spider] = None
@@ -132,8 +119,24 @@ class Crawler:
         try:
             self.spider = self._create_spider(*args, **kwargs)
             self.spider.update_settings(self.settings)
-            self.settings.freeze()
+
+            reactor_class: str = self.settings["TWISTED_REACTOR"]
+            event_loop: str = self.settings["ASYNCIO_EVENT_LOOP"]
+            if self._init_reactor:
+                # this needs to be done after the spider settings are merged,
+                # but before something imports twisted.internet.reactor
+                if reactor_class:
+                    install_reactor(reactor_class, event_loop)
+                else:
+                    from twisted.internet import reactor  # noqa: F401
+                log_reactor_info()
+            if reactor_class:
+                verify_installed_reactor(reactor_class)
+                if is_asyncio_reactor_installed() and event_loop:
+                    verify_installed_asyncio_event_loop(event_loop)
+
             self.extensions: ExtensionManager = ExtensionManager.from_crawler(self)
+            self.settings.freeze()
 
             self.engine = self._create_engine()
             start_requests = iter(self.spider.start_requests())