async def wait_for_http_server(url, timeout=10, ssl_context=None):
"""Wait for an HTTP Server to respond at url.
Any non-5XX response code will do, even 404.
"""
loop = ioloop.IOLoop.current()
tic = loop.time()
client = AsyncHTTPClient()
if ssl_context:
client.ssl_options = ssl_context
async def is_reachable():
try:
r = await client.fetch(url, follow_redirects=False)
return r
except HTTPError as e:
if e.code >= 500:
# failed to respond properly, wait and try again
if e.code != 599:
# we expect 599 for no connection,
# but 502 or other proxy error is conceivable
app_log.warning(
"Server at %s responded with error: %s", url, e.code)
else:
app_log.debug("Server at %s responded with %s", url, e.code)
return e.response
except (OSError, socket.error) as e:
if e.errno not in {errno.ECONNABORTED, errno.ECONNREFUSED, errno.ECONNRESET}:
app_log.warning("Failed to connect to %s (%s)", url, e)
return False
re = await exponential_backoff(
is_reachable,
"Server at {url} didn't respond in {timeout} seconds".format(url=url, timeout=timeout),
timeout=timeout
)
return re
async def wait_for_http_server(url, timeout=10, ssl_context=None):
"""Wait for an HTTP Server to respond at url.
Any non-5XX response code will do, even 404.
"""
loop = ioloop.IOLoop.current()
tic = loop.time()
client = AsyncHTTPClient()
if ssl_context:
client.ssl_options = ssl_context
async def is_reachable():
try:
r = await client.fetch(url, follow_redirects=False)
return r
except HTTPError as e:
if e.code >= 500:
# failed to respond properly, wait and try again
if e.code != 599:
# we expect 599 for no connection,
# but 502 or other proxy error is conceivable
app_log.warning(
"Server at %s responded with error: %s", url, e.code)
else:
app_log.debug("Server at %s responded with %s", url, e.code)
return e.response
except (OSError, socket.error) as e:
if e.errno not in {errno.ECONNABORTED, errno.ECONNREFUSED, errno.ECONNRESET}:
app_log.warning("Failed to connect to %s (%s)", url, e)
return False
re = await exponential_backoff(
is_reachable,
"Server at {url} didn't respond in {timeout} seconds".format(url=url, timeout=timeout),
timeout=timeout
)
return re
