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variables for exponential falloff

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Min RK
2017-07-15 13:05:39 +02:00
parent 8e3c4b1925
commit efa6a33b0a
2 changed files with 13 additions and 7 deletions
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14
jupyterhub/utils.py
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@@ -48,6 +48,12 @@ def can_connect(ip, port):
else:
return True
# exponential falloff factors:
# start at 100ms, falloff by 2x
# never longer than 5s
DT_MIN = 0.1
DT_SCALE = 2
DT_MAX = 5
@gen.coroutine
def wait_for_server(ip, port, timeout=10):
@@ -56,13 +62,13 @@ def wait_for_server(ip, port, timeout=10):
ip = '127.0.0.1'
loop = ioloop.IOLoop.current()
tic = loop.time()
dt = 0.1
dt = DT_MIN
while dt > 0:
if can_connect(ip, port):
return
else:
yield gen.sleep(dt)
dt = min(dt * 2, timeout - (loop.time() - tic))
dt = min(dt * DT_SCALE, DT_MAX, timeout - (loop.time() - tic))
raise TimeoutError(
"Server at {ip}:{port} didn't respond in {timeout} seconds".format(**locals())
)
@@ -77,7 +83,7 @@ def wait_for_http_server(url, timeout=10):
loop = ioloop.IOLoop.current()
tic = loop.time()
client = AsyncHTTPClient()
dt = 0.1
dt = DT_MIN
while dt > 0:
try:
r = yield client.fetch(url, follow_redirects=False)
@@ -99,7 +105,7 @@ def wait_for_http_server(url, timeout=10):
yield gen.sleep(dt)
else:
return r
dt = min(dt * 2, timeout - (loop.time() - tic))
dt = min(dt * DT_SCALE, DT_MAX, timeout - (loop.time() - tic))
raise TimeoutError(
"Server at {url} didn't respond in {timeout} seconds".format(**locals())