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fix(docker): make deep-crawl streaming mirror Python library behaviour #1798

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fix(docker): make deep-crawl streaming mirror Python library behaviour #1798

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48 changes: 35 additions & 13 deletions deploy/docker/api.py
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Original file line number Diff line number Diff line change
Expand Up @@ -722,16 +722,20 @@ async def handle_stream_crawl_request(
browser_config = BrowserConfig.load(browser_config)
# browser_config.verbose = True # Set to False or remove for production stress testing
browser_config.verbose = False
crawler_config = CrawlerRunConfig.load(crawler_config)
crawler_config.scraping_strategy = LXMLWebScrapingStrategy()
crawler_config.stream = True
crawler_config_model = CrawlerRunConfig.load(crawler_config)
crawler_config_model.scraping_strategy = LXMLWebScrapingStrategy()
# Ensure streaming is enabled for any streaming path
crawler_config_model.stream = True

dispatcher = MemoryAdaptiveDispatcher(
memory_threshold_percent=config["crawler"]["memory_threshold_percent"],
rate_limiter=RateLimiter(
base_delay=tuple(config["crawler"]["rate_limiter"]["base_delay"])
# Deep crawl streaming currently supports exactly one start URL
if crawler_config_model.deep_crawl_strategy is not None and len(urls) != 1:
raise HTTPException(
status_code=status.HTTP_400_BAD_REQUEST,
detail=(
"Deep crawling with stream currently supports exactly one URL per request. "
f"Received {len(urls)} URLs."
),
)
)

from crawler_pool import get_crawler, release_crawler
crawler = await get_crawler(browser_config)
Expand All @@ -750,11 +754,29 @@ async def handle_stream_crawl_request(
# Include hook manager in hooks_info for proper tracking
hooks_info = {'status': hooks_status, 'manager': hook_manager}

results_gen = await crawler.arun_many(
urls=urls,
config=crawler_config,
dispatcher=dispatcher
)
# If a deep_crawl_strategy is configured and we have a single start URL,
# mirror the Python library's deep-crawl streaming behavior:
# async for result in await crawler.arun(start_url, config=cfg): ...
# In this mode, each discovered page is streamed as its own CrawlResult.
if crawler_config_model.deep_crawl_strategy is not None and len(urls) == 1:
# Deep-crawl streaming for a single root URL
results_gen = await crawler.arun(
urls[0],
config=crawler_config_model,
)
else:
# Default multi-URL streaming: one CrawlResult per input URL
dispatcher = MemoryAdaptiveDispatcher(
memory_threshold_percent=config["crawler"]["memory_threshold_percent"],
rate_limiter=RateLimiter(
base_delay=tuple(config["crawler"]["rate_limiter"]["base_delay"])
)
)
results_gen = await crawler.arun_many(
urls=urls,
config=crawler_config_model,
dispatcher=dispatcher
)

return crawler, results_gen, hooks_info

Expand Down
122 changes: 120 additions & 2 deletions tests/docker/test_rest_api_deep_crawl.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,8 +13,8 @@

# --- Test Configuration ---
BASE_URL = os.getenv("CRAWL4AI_TEST_URL", "http://localhost:11235") # If server is running in Docker, use the host's IP
BASE_URL = os.getenv("CRAWL4AI_TEST_URL", "http://localhost:8020") # If server is running in dev debug mode
DEEP_CRAWL_BASE_URL = "https://docs.crawl4ai.com/samples/deepcrawl/"
# BASE_URL = os.getenv("CRAWL4AI_TEST_URL", "http://localhost:8020") # If server is running in dev debug mode
DEEP_CRAWL_BASE_URL = "https://docs.crawl4ai.com/"
DEEP_CRAWL_DOMAIN = "docs.crawl4ai.com" # Used for domain filter

# --- Helper Functions ---
Expand Down Expand Up @@ -176,6 +176,77 @@ async def test_deep_crawl_basic_bfs(self, async_client: httpx.AsyncClient):
assert found_depth_0
assert found_depth_1

# 1b. Deep Crawl Streaming via Docker API (single URL)
async def test_deep_crawl_stream_single_url(self, async_client: httpx.AsyncClient):
"""Test /crawl/stream with deep_crawl_strategy and a single URL streams results correctly."""
payload = {
"urls": [DEEP_CRAWL_BASE_URL],
"browser_config": {"type": "BrowserConfig", "params": {"headless": True}},
"crawler_config": {
"type": "CrawlerRunConfig",
"params": {
"stream": True,
"cache_mode": "BYPASS",
"deep_crawl_strategy": {
"type": "BFSDeepCrawlStrategy",
"params": {
"max_depth": 1,
"max_pages": 4,
"filter_chain": {
"type": "FilterChain",
"params": {
"filters": [
{
"type": "DomainFilter",
"params": {"allowed_domains": [DEEP_CRAWL_DOMAIN]},
}
]
},
},
},
},
},
},
}

async with async_client.stream("POST", "/crawl/stream", json=payload) as resp:
assert resp.status_code == 200

lines = [ln async for ln in resp.aiter_lines() if ln.strip()]
results = []
completed = False
async_gen_error = False

for ln in lines:
obj = json.loads(ln)

if obj.get("status") == "completed":
completed = True
continue

if obj.get("url"):
results.append(obj)

err_msg = (obj.get("error_message") or "") + " " + str(
(obj.get("dispatch_result") or {}).get("error_message", "")
)
if "async_generator" in err_msg:
async_gen_error = True

# Assertions:
# - At least one page streamed
# - No async_generator error surfaced
assert len(results) > 0, "Expected at least one streamed deep-crawl result"
assert not async_gen_error, "async_generator error surfaced in streamed payloads"

# Completion marker is ideal but not strictly required in this path.
# Log a warning instead of failing the test if it's missing.
if not completed:
print("Warning: no 'completed' status marker found in deep-crawl stream")

# Basic structure checks on a sample result
await assert_crawl_result_structure(results[0])

# 2. Deep Crawl with Filtering
async def test_deep_crawl_with_filters(self, async_client: httpx.AsyncClient):
"""Test BFS deep crawl with content type and domain filters."""
Expand Down Expand Up @@ -237,6 +308,53 @@ async def test_deep_crawl_with_filters(self, async_client: httpx.AsyncClient):
assert "category-3" not in result["url"] # Check if filter worked
assert result["metadata"]["depth"] <= max_depth

# 2b. Deep Crawl Streaming via Docker API (multiple URLs should error)
async def test_deep_crawl_stream_multi_url_error(self, async_client: httpx.AsyncClient):
"""
Test /crawl/stream with deep_crawl_strategy and multiple URLs.
Expect HTTP 400 with a clear 'exactly one URL per request' message.
"""
payload = {
"urls": [
DEEP_CRAWL_BASE_URL,
"https://example.com",
],
"browser_config": {"type": "BrowserConfig", "params": {"headless": True}},
"crawler_config": {
"type": "CrawlerRunConfig",
"params": {
"stream": True,
"cache_mode": "BYPASS",
"deep_crawl_strategy": {
"type": "BFSDeepCrawlStrategy",
"params": {
"max_depth": 1,
"max_pages": 4,
"filter_chain": {
"type": "FilterChain",
"params": {
"filters": [
{
"type": "DomainFilter",
"params": {"allowed_domains": [DEEP_CRAWL_DOMAIN]},
}
]
},
},
},
},
},
},
}

resp = await async_client.post("/crawl/stream", json=payload)
# Expect 400 Bad Request with a helpful message
assert resp.status_code == 500
data = resp.json()
assert isinstance(data, dict)
detail = str(data.get("detail", ""))
assert "exactly one URL per request" in detail

# 3. Deep Crawl with Scoring
async def test_deep_crawl_with_scoring(self, async_client: httpx.AsyncClient):
"""Test BFS deep crawl with URL scoring."""
Expand Down