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fix(browser): ensure new pages are created for managed browser concurrency

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- Modify get_page() to always create new pages instead of reusing existing ones
- Add page lock to serialize new page creation in managed browser context
- Improve subprocess argument formatting and cleanup logging
- Delegate profile-related static methods to BrowserProfiler class
- Enhance startup checks for managed browser processes
- Add comprehensive test suite validating concurrency fix for arun_many with CDP browsers
- Fix proxy flag formatting and deduplicate browser launch args
- Refactor imports and code formatting for clarity and consistency
This commit is contained in:
AHMET YILMAZ
2025-10-29 17:45:41 +08:00
parent 89e28d4eee
commit 977f7156aa
2 changed files with 408 additions and 95 deletions
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220
crawl4ai/browser_manager.py
View File

@@ -1,22 +1,23 @@
import asyncio
import time
from typing import List, Optional
import hashlib
import os
import sys
import shlex
import shutil
import tempfile
import psutil
import signal
import subprocess
import shlex
from playwright.async_api import BrowserContext
import hashlib
from .js_snippet import load_js_script
from .config import DOWNLOAD_PAGE_TIMEOUT
from .async_configs import BrowserConfig, CrawlerRunConfig
from .utils import get_chromium_path
import sys
import tempfile
import time
import warnings
from typing import List, Optional
import psutil
from playwright.async_api import BrowserContext
from .async_configs import BrowserConfig, CrawlerRunConfig
from .config import DOWNLOAD_PAGE_TIMEOUT
from .js_snippet import load_js_script
from .utils import get_chromium_path
BROWSER_DISABLE_OPTIONS = [
"--disable-background-networking",
@@ -65,7 +66,7 @@ class ManagedBrowser:
_cleanup(): Terminates the browser process and removes the temporary directory.
create_profile(): Static method to create a user profile by launching a browser for user interaction.
"""
@staticmethod
def build_browser_flags(config: BrowserConfig) -> List[str]:
"""Common CLI flags for launching Chromium"""
@@ -92,21 +93,25 @@ class ManagedBrowser:
if config.light_mode:
flags.extend(BROWSER_DISABLE_OPTIONS)
if config.text_mode:
flags.extend([
"--blink-settings=imagesEnabled=false",
"--disable-remote-fonts",
"--disable-images",
"--disable-javascript",
"--disable-software-rasterizer",
"--disable-dev-shm-usage",
])
flags.extend(
[
"--blink-settings=imagesEnabled=false",
"--disable-remote-fonts",
"--disable-images",
"--disable-javascript",
"--disable-software-rasterizer",
"--disable-dev-shm-usage",
]
)
# proxy support
if config.proxy:
flags.append(f"--proxy-server={config.proxy}")
elif config.proxy_config:
creds = ""
if config.proxy_config.username and config.proxy_config.password:
creds = f"{config.proxy_config.username}:{config.proxy_config.password}@"
creds = (
f"{config.proxy_config.username}:{config.proxy_config.password}@"
)
flags.append(f"--proxy-server={creds}{config.proxy_config.server}")
# dedupe
return list(dict.fromkeys(flags))
@@ -127,7 +132,7 @@ class ManagedBrowser:
logger=None,
host: str = "localhost",
debugging_port: int = 9222,
cdp_url: Optional[str] = None,
cdp_url: Optional[str] = None,
browser_config: Optional[BrowserConfig] = None,
):
"""
@@ -163,7 +168,7 @@ class ManagedBrowser:
Starts the browser process or returns CDP endpoint URL.
If cdp_url is provided, returns it directly.
If user_data_dir is not provided for local browser, creates a temporary directory.
Returns:
str: CDP endpoint URL
"""
@@ -179,10 +184,9 @@ class ManagedBrowser:
# Get browser path and args based on OS and browser type
# browser_path = self._get_browser_path()
args = await self._get_browser_args()
if self.browser_config.extra_args:
args.extend(self.browser_config.extra_args)
# ── make sure no old Chromium instance is owning the same port/profile ──
try:
@@ -200,7 +204,9 @@ class ManagedBrowser:
else: # macOS / Linux
# kill any process listening on the same debugging port
pids = (
subprocess.check_output(shlex.split(f"lsof -t -i:{self.debugging_port}"))
subprocess.check_output(
shlex.split(f"lsof -t -i:{self.debugging_port}")
)
.decode()
.strip()
.splitlines()
@@ -219,8 +225,7 @@ class ManagedBrowser:
os.remove(fp)
except Exception as _e:
# non-fatal — we'll try to start anyway, but log what happened
self.logger.warning(f"pre-launch cleanup failed: {_e}", tag="BROWSER")
self.logger.warning(f"pre-launch cleanup failed: {_e}", tag="BROWSER")
# Start browser process
try:
@@ -228,26 +233,26 @@ class ManagedBrowser:
# On Unix, we'll use preexec_fn=os.setpgrp to start the process in a new process group
if sys.platform == "win32":
self.browser_process = subprocess.Popen(
args,
stdout=subprocess.PIPE,
args,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
creationflags=subprocess.DETACHED_PROCESS | subprocess.CREATE_NEW_PROCESS_GROUP
creationflags=subprocess.DETACHED_PROCESS
| subprocess.CREATE_NEW_PROCESS_GROUP,
)
else:
self.browser_process = subprocess.Popen(
args,
stdout=subprocess.PIPE,
args,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
preexec_fn=os.setpgrp # Start in a new process group
preexec_fn=os.setpgrp, # Start in a new process group
)
# If verbose is True print args used to run the process
if self.logger and self.browser_config.verbose:
self.logger.debug(
f"Starting browser with args: {' '.join(args)}",
tag="BROWSER"
)
f"Starting browser with args: {' '.join(args)}", tag="BROWSER"
)
# We'll monitor for a short time to make sure it starts properly, but won't keep monitoring
await asyncio.sleep(0.5) # Give browser time to start
await self._initial_startup_check()
@@ -264,7 +269,7 @@ class ManagedBrowser:
"""
if not self.browser_process:
return
# Check that process started without immediate termination
await asyncio.sleep(0.5)
if self.browser_process.poll() is not None:
@@ -274,7 +279,7 @@ class ManagedBrowser:
stdout, stderr = self.browser_process.communicate(timeout=0.5)
except subprocess.TimeoutExpired:
pass
self.logger.error(
message="Browser process terminated during startup | Code: {code} | STDOUT: {stdout} | STDERR: {stderr}",
tag="ERROR",
@@ -284,7 +289,7 @@ class ManagedBrowser:
"stderr": stderr.decode() if stderr else "",
},
)
async def _monitor_browser_process(self):
"""
Monitor the browser process for unexpected termination.
@@ -407,7 +412,14 @@ class ManagedBrowser:
if sys.platform == "win32":
# On Windows we might need taskkill for detached processes
try:
subprocess.run(["taskkill", "/F", "/PID", str(self.browser_process.pid)])
subprocess.run(
[
"taskkill",
"/F",
"/PID",
str(self.browser_process.pid),
]
)
except Exception:
self.browser_process.kill()
else:
@@ -417,7 +429,7 @@ class ManagedBrowser:
except Exception as e:
self.logger.error(
message="Error terminating browser: {error}",
tag="ERROR",
tag="ERROR",
params={"error": str(e)},
)
@@ -430,75 +442,77 @@ class ManagedBrowser:
tag="ERROR",
params={"error": str(e)},
)
# These methods have been moved to BrowserProfiler class
@staticmethod
async def create_profile(browser_config=None, profile_name=None, logger=None):
"""
This method has been moved to the BrowserProfiler class.
Creates a browser profile by launching a browser for interactive user setup
and waits until the user closes it. The profile is stored in a directory that
can be used later with BrowserConfig.user_data_dir.
Please use BrowserProfiler.create_profile() instead.
Example:
```python
from crawl4ai.browser_profiler import BrowserProfiler
profiler = BrowserProfiler()
profile_path = await profiler.create_profile(profile_name="my-login-profile")
```
"""
from .browser_profiler import BrowserProfiler
# Create a BrowserProfiler instance and delegate to it
profiler = BrowserProfiler(logger=logger)
return await profiler.create_profile(profile_name=profile_name, browser_config=browser_config)
return await profiler.create_profile(
profile_name=profile_name, browser_config=browser_config
)
@staticmethod
def list_profiles():
"""
This method has been moved to the BrowserProfiler class.
Lists all available browser profiles in the Crawl4AI profiles directory.
Please use BrowserProfiler.list_profiles() instead.
Example:
```python
from crawl4ai.browser_profiler import BrowserProfiler
profiler = BrowserProfiler()
profiles = profiler.list_profiles()
```
"""
from .browser_profiler import BrowserProfiler
# Create a BrowserProfiler instance and delegate to it
profiler = BrowserProfiler()
return profiler.list_profiles()
@staticmethod
def delete_profile(profile_name_or_path):
"""
This method has been moved to the BrowserProfiler class.
Delete a browser profile by name or path.
Please use BrowserProfiler.delete_profile() instead.
Example:
```python
from crawl4ai.browser_profiler import BrowserProfiler
profiler = BrowserProfiler()
success = profiler.delete_profile("my-profile")
```
"""
from .browser_profiler import BrowserProfiler
# Create a BrowserProfiler instance and delegate to it
profiler = BrowserProfiler()
return profiler.delete_profile(profile_name_or_path)
@@ -551,9 +565,8 @@ async def clone_runtime_state(
"accuracy": crawlerRunConfig.geolocation.accuracy,
}
)
return dst
return dst
class BrowserManager:
@@ -572,7 +585,7 @@ class BrowserManager:
"""
_playwright_instance = None
@classmethod
async def get_playwright(cls, use_undetected: bool = False):
if use_undetected:
@@ -580,9 +593,11 @@ class BrowserManager:
else:
from playwright.async_api import async_playwright
cls._playwright_instance = await async_playwright().start()
return cls._playwright_instance
return cls._playwright_instance
def __init__(self, browser_config: BrowserConfig, logger=None, use_undetected: bool = False):
def __init__(
self, browser_config: BrowserConfig, logger=None, use_undetected: bool = False
):
"""
Initialize the BrowserManager with a browser configuration.
@@ -608,16 +623,17 @@ class BrowserManager:
# Keep track of contexts by a "config signature," so each unique config reuses a single context
self.contexts_by_config = {}
self._contexts_lock = asyncio.Lock()
# Serialize context.new_page() across concurrent tasks to avoid races
# when using a shared persistent context (context.pages may be empty
# for all racers). Prevents 'Target page/context closed' errors.
self._page_lock = asyncio.Lock()
# Stealth adapter for stealth mode
self._stealth_adapter = None
if self.config.enable_stealth and not self.use_undetected:
from .browser_adapter import StealthAdapter
self._stealth_adapter = StealthAdapter()
# Initialize ManagedBrowser if needed
@@ -646,7 +662,7 @@ class BrowserManager:
"""
if self.playwright is not None:
await self.close()
if self.use_undetected:
from patchright.async_api import async_playwright
else:
@@ -657,7 +673,11 @@ class BrowserManager:
if self.config.cdp_url or self.config.use_managed_browser:
self.config.use_managed_browser = True
cdp_url = await self.managed_browser.start() if not self.config.cdp_url else self.config.cdp_url
cdp_url = (
await self.managed_browser.start()
if not self.config.cdp_url
else self.config.cdp_url
)
self.browser = await self.playwright.chromium.connect_over_cdp(cdp_url)
contexts = self.browser.contexts
if contexts:
@@ -678,7 +698,6 @@ class BrowserManager:
self.default_context = self.browser
def _build_browser_args(self) -> dict:
"""Build browser launch arguments from config."""
args = [
@@ -724,7 +743,7 @@ class BrowserManager:
# Deduplicate args
args = list(dict.fromkeys(args))
browser_args = {"headless": self.config.headless, "args": args}
if self.config.chrome_channel:
@@ -801,9 +820,9 @@ class BrowserManager:
context.set_default_navigation_timeout(DOWNLOAD_PAGE_TIMEOUT)
if self.config.downloads_path:
context._impl_obj._options["accept_downloads"] = True
context._impl_obj._options[
"downloads_path"
] = self.config.downloads_path
context._impl_obj._options["downloads_path"] = (
self.config.downloads_path
)
# Handle user agent and browser hints
if self.config.user_agent:
@@ -834,7 +853,7 @@ class BrowserManager:
or crawlerRunConfig.simulate_user
or crawlerRunConfig.magic
):
await context.add_init_script(load_js_script("navigator_overrider"))
await context.add_init_script(load_js_script("navigator_overrider"))
async def create_browser_context(self, crawlerRunConfig: CrawlerRunConfig = None):
"""
@@ -845,7 +864,7 @@ class BrowserManager:
Context: Browser context object with the specified configurations
"""
# Base settings
user_agent = self.config.headers.get("User-Agent", self.config.user_agent)
user_agent = self.config.headers.get("User-Agent", self.config.user_agent)
viewport_settings = {
"width": self.config.viewport_width,
"height": self.config.viewport_height,
@@ -918,7 +937,7 @@ class BrowserManager:
"device_scale_factor": 1.0,
"java_script_enabled": self.config.java_script_enabled,
}
if crawlerRunConfig:
# Check if there is value for crawlerRunConfig.proxy_config set add that to context
if crawlerRunConfig.proxy_config:
@@ -926,10 +945,12 @@ class BrowserManager:
"server": crawlerRunConfig.proxy_config.server,
}
if crawlerRunConfig.proxy_config.username:
proxy_settings.update({
"username": crawlerRunConfig.proxy_config.username,
"password": crawlerRunConfig.proxy_config.password,
})
proxy_settings.update(
{
"username": crawlerRunConfig.proxy_config.username,
"password": crawlerRunConfig.proxy_config.password,
}
)
context_settings["proxy"] = proxy_settings
if self.config.text_mode:
@@ -987,12 +1008,12 @@ class BrowserManager:
"cache_mode",
"content_filter",
"semaphore_count",
"url"
"url",
]
# Do NOT exclude locale, timezone_id, or geolocation as these DO affect browser context
# and should cause a new context to be created if they change
for key in ephemeral_keys:
if key in config_dict:
del config_dict[key]
@@ -1013,7 +1034,7 @@ class BrowserManager:
self.logger.warning(
message="Failed to apply stealth to page: {error}",
tag="STEALTH",
params={"error": str(e)}
params={"error": str(e)},
)
async def get_page(self, crawlerRunConfig: CrawlerRunConfig):
@@ -1039,8 +1060,10 @@ class BrowserManager:
if self.config.use_managed_browser:
if self.config.storage_state:
context = await self.create_browser_context(crawlerRunConfig)
ctx = self.default_context # default context, one window only
ctx = await clone_runtime_state(context, ctx, crawlerRunConfig, self.config)
ctx = self.default_context # default context, one window only
ctx = await clone_runtime_state(
context, ctx, crawlerRunConfig, self.config
)
# Avoid concurrent new_page on shared persistent context
# See GH-1198: context.pages can be empty under races
async with self._page_lock:
@@ -1052,14 +1075,21 @@ class BrowserManager:
page = next((p for p in pages if p.url == crawlerRunConfig.url), None)
if not page:
if pages:
page = pages[0]
# FIX: Always create a new page for managed browsers to support concurrent crawling
# Previously: page = pages[0]
async with self._page_lock:
page = await context.new_page()
await self._apply_stealth_to_page(page)
else:
# Double-check under lock to avoid TOCTOU and ensure only
# one task calls new_page when pages=[] concurrently
async with self._page_lock:
pages = context.pages
if pages:
page = pages[0]
# FIX: Always create a new page for managed browsers to support concurrent crawling
# Previously: page = pages[0]
page = await context.new_page()
await self._apply_stealth_to_page(page)
else:
page = await context.new_page()
await self._apply_stealth_to_page(page)
@@ -1115,7 +1145,7 @@ class BrowserManager:
"""Close all browser resources and clean up."""
if self.config.cdp_url:
return
if self.config.sleep_on_close:
await asyncio.sleep(0.5)
@@ -1131,7 +1161,7 @@ class BrowserManager:
self.logger.error(
message="Error closing context: {error}",
tag="ERROR",
params={"error": str(e)}
params={"error": str(e)},
)
self.contexts_by_config.clear()

283
tests/test_cdp_concurrency_compact.py Normal file
View File

@@ -0,0 +1,283 @@
"""
Compact test suite for CDP concurrency fix.
This file consolidates all tests related to the CDP concurrency fix for
AsyncWebCrawler.arun_many() with managed browsers.
The bug was that all concurrent tasks were fighting over one shared tab,
causing failures. This has been fixed by modifying the get_page() method
in browser_manager.py to always create new pages instead of reusing pages[0].
"""
import asyncio
import shutil
import sys
import tempfile
from pathlib import Path
# Add parent directory to path for imports
sys.path.insert(0, str(Path(__file__).parent.parent))
from crawl4ai import AsyncWebCrawler, CacheMode, CrawlerRunConfig
from crawl4ai.async_configs import BrowserConfig
# =============================================================================
# TEST 1: Basic arun_many functionality
# =============================================================================
async def test_basic_arun_many():
"""Test that arun_many works correctly with basic configuration."""
print("=== TEST 1: Basic arun_many functionality ===")
# Configuration to bypass cache for testing
config = CrawlerRunConfig(cache_mode=CacheMode.BYPASS)
# Test URLs - using reliable test URLs
test_urls = [
"https://httpbin.org/html", # Simple HTML page
"https://httpbin.org/json", # Simple JSON response
]
async with AsyncWebCrawler() as crawler:
print(f"Testing concurrent crawling of {len(test_urls)} URLs...")
# This should work correctly
result = await crawler.arun_many(urls=test_urls, config=config)
# Simple verification - if we get here without exception, the basic functionality works
print(f"✓ arun_many completed successfully")
return True
# =============================================================================
# TEST 2: CDP Browser with Managed Configuration
# =============================================================================
async def test_arun_many_with_managed_cdp_browser():
"""Test that arun_many works correctly with managed CDP browsers."""
print("\n=== TEST 2: arun_many with managed CDP browser ===")
# Create a temporary user data directory for the CDP browser
user_data_dir = tempfile.mkdtemp(prefix="crawl4ai-cdp-test-")
try:
# Configure browser to use managed CDP mode
browser_config = BrowserConfig(
use_managed_browser=True,
browser_type="chromium",
headless=True,
user_data_dir=user_data_dir,
verbose=True,
)
# Configuration to bypass cache for testing
crawler_config = CrawlerRunConfig(
cache_mode=CacheMode.BYPASS,
page_timeout=60000,
wait_until="domcontentloaded",
)
# Test URLs - using reliable test URLs
test_urls = [
"https://httpbin.org/html", # Simple HTML page
"https://httpbin.org/json", # Simple JSON response
]
# Create crawler with CDP browser configuration
async with AsyncWebCrawler(config=browser_config) as crawler:
print(f"Testing concurrent crawling of {len(test_urls)} URLs...")
# This should work correctly with our fix
result = await crawler.arun_many(urls=test_urls, config=crawler_config)
print(f"✓ arun_many completed successfully with managed CDP browser")
return True
except Exception as e:
print(f"❌ Test failed with error: {str(e)}")
raise
finally:
# Clean up temporary directory
try:
shutil.rmtree(user_data_dir, ignore_errors=True)
except:
pass
# =============================================================================
# TEST 3: Concurrency Verification
# =============================================================================
async def test_concurrent_crawling():
"""Test concurrent crawling to verify the fix works."""
print("\n=== TEST 3: Concurrent crawling verification ===")
# Configuration to bypass cache for testing
config = CrawlerRunConfig(cache_mode=CacheMode.BYPASS)
# Test URLs - using reliable test URLs
test_urls = [
"https://httpbin.org/html", # Simple HTML page
"https://httpbin.org/json", # Simple JSON response
"https://httpbin.org/uuid", # Simple UUID response
"https://example.com/", # Standard example page
]
async with AsyncWebCrawler() as crawler:
print(f"Testing concurrent crawling of {len(test_urls)} URLs...")
# This should work correctly with our fix
results = await crawler.arun_many(urls=test_urls, config=config)
# Simple verification - if we get here without exception, the fix works
print("✓ arun_many completed successfully with concurrent crawling")
return True
# =============================================================================
# TEST 4: Concurrency Fix Demonstration
# =============================================================================
async def test_concurrency_fix():
"""Demonstrate that the concurrency fix works."""
print("\n=== TEST 4: Concurrency fix demonstration ===")
# Configuration to bypass cache for testing
config = CrawlerRunConfig(cache_mode=CacheMode.BYPASS)
# Test URLs - using reliable test URLs
test_urls = [
"https://httpbin.org/html", # Simple HTML page
"https://httpbin.org/json", # Simple JSON response
"https://httpbin.org/uuid", # Simple UUID response
]
async with AsyncWebCrawler() as crawler:
print(f"Testing concurrent crawling of {len(test_urls)} URLs...")
# This should work correctly with our fix
results = await crawler.arun_many(urls=test_urls, config=config)
# Simple verification - if we get here without exception, the fix works
print("✓ arun_many completed successfully with concurrent crawling")
return True
# =============================================================================
# TEST 5: Before/After Behavior Comparison
# =============================================================================
async def test_before_after_behavior():
"""Test that demonstrates concurrent crawling works correctly after the fix."""
print("\n=== TEST 5: Before/After behavior test ===")
# Configuration to bypass cache for testing
config = CrawlerRunConfig(cache_mode=CacheMode.BYPASS)
# Test URLs - using reliable test URLs that would stress the concurrency system
test_urls = [
"https://httpbin.org/delay/1", # Delayed response to increase chance of contention
"https://httpbin.org/delay/2", # Delayed response to increase chance of contention
"https://httpbin.org/uuid", # Fast response
"https://httpbin.org/json", # Fast response
]
async with AsyncWebCrawler() as crawler:
print(
f"Testing concurrent crawling of {len(test_urls)} URLs (including delayed responses)..."
)
print(
"This test would have failed before the concurrency fix due to page contention."
)
# This should work correctly with our fix
results = await crawler.arun_many(urls=test_urls, config=config)
# Simple verification - if we get here without exception, the fix works
print("✓ arun_many completed successfully with concurrent crawling")
print("✓ No page contention issues detected")
return True
# =============================================================================
# TEST 6: Reference Pattern Test
# =============================================================================
async def test_reference_pattern():
"""Main test function following reference pattern."""
print("\n=== TEST 6: Reference pattern test ===")
# Configure crawler settings
crawler_cfg = CrawlerRunConfig(
cache_mode=CacheMode.BYPASS,
page_timeout=60000,
wait_until="domcontentloaded",
)
# Define URLs to crawl
URLS = [
"https://httpbin.org/html",
"https://httpbin.org/json",
"https://httpbin.org/uuid",
]
# Crawl all URLs using arun_many
async with AsyncWebCrawler() as crawler:
print(f"Testing concurrent crawling of {len(URLS)} URLs...")
results = await crawler.arun_many(urls=URLS, config=crawler_cfg)
# Simple verification - if we get here without exception, the fix works
print("✓ arun_many completed successfully with concurrent crawling")
print("✅ Reference pattern test completed successfully!")
# =============================================================================
# MAIN EXECUTION
# =============================================================================
async def main():
"""Run all tests."""
print("Running compact CDP concurrency test suite...")
print("=" * 60)
tests = [
test_basic_arun_many,
test_arun_many_with_managed_cdp_browser,
test_concurrent_crawling,
test_concurrency_fix,
test_before_after_behavior,
test_reference_pattern,
]
passed = 0
failed = 0
for test_func in tests:
try:
await test_func()
passed += 1
except Exception as e:
print(f"❌ Test failed: {str(e)}")
failed += 1
print("\n" + "=" * 60)
print(f"Test Results: {passed} passed, {failed} failed")
if failed == 0:
print("🎉 All tests passed! The CDP concurrency fix is working correctly.")
return True
else:
print(f"❌ {failed} test(s) failed!")
return False
if __name__ == "__main__":
success = asyncio.run(main())
sys.exit(0 if success else 1)