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import http
import json
import random
import time
import requests
import sys
import urllib3
import logging
LOG = logging.getLogger(__name__)
def bytes(n):
if n < 0:
sign = "-"
n -= 0
else:
sign = ""
u = ["", " KiB", " MiB", " GiB", " TiB", " PiB", " EiB", " ZiB", " YiB"]
i = 0
while n >= 1024:
n /= 1024.0
i += 1
return "%s%g%s" % (sign, int(n * 10 + 0.5) / 10.0, u[i])
class Result:
def __init__(
self,
/,
error=None,
message=None,
retry_same_host=False,
retry_next_host=False,
):
self.error = error
self.message = message
self.retry_same_host = retry_same_host
self.retry_next_host = retry_next_host
def __repr__(self):
message = "None" if self.message is None else self.message[:10]
return (
f"{self.__class__.__name__}(error={self.error!r}, retry_same_host={self.retry_same_host},"
f" retry_next_host={self.retry_next_host}, message={message}... )"
)
class RemoteMarsClientSession:
def __init__(self, url, request, environ, target, timeout=60):
self.url = url
self.request = request
self.environ = environ
self.target = target
self.uid = None
self.endr_recieved = False
self.timeout = timeout
def _transfer(self, r):
start = time.time()
total = 0
with open(self.target, "wb") as f:
self.endr_recieved = False
count = 0
for chunk in r.raw.read_chunked():
count += 1
total += len(chunk)
if len(chunk) == 4:
if chunk == b"RWND":
f.seek(0)
f.truncate(0)
continue
if chunk == b"EROR":
raise ValueError("Error received")
if chunk == b"ENDR":
self.endr_recieved = True
continue
raise ValueError(f"Unknown message {chunk}")
f.write(chunk)
if not self.endr_recieved:
raise ValueError("ENDR not received")
elapsed = time.time() - start
LOG.info(f"Transfered {bytes(total)} in {elapsed:.1f}s, {bytes(total/elapsed)}")
def execute(self):
LOG.info(f"Calling {self.url} {self.request} {self.environ}")
error = None
try:
r = requests.post(
self.url,
json=dict(
request=self.request,
environ=self.environ,
),
stream=True,
timeout=self.timeout,
)
except requests.exceptions.Timeout as e:
LOG.error(f"Timeout {e}")
return Result(error=e, retry_next_host=True)
except requests.exceptions.ConnectionError as e:
LOG.error(f"Connection error {e}")
return Result(error=e, retry_next_host=True)
try:
r.raise_for_status()
except requests.exceptions.HTTPError as e:
LOG.error(f"HTTP error {e}")
error = e
uid = None
code = r.status_code
if code not in (http.HTTPStatus.BAD_REQUEST, http.HTTPStatus.OK):
retry_same_host = code in (
http.HTTPStatus.BAD_GATEWAY,
http.HTTPStatus.GATEWAY_TIMEOUT,
http.HTTPStatus.INTERNAL_SERVER_ERROR,
http.HTTPStatus.REQUEST_TIMEOUT,
http.HTTPStatus.SERVICE_UNAVAILABLE,
)
retry_next_host = code in (http.HTTPStatus.TOO_MANY_REQUESTS,)
if "X-MARS-SIGNAL" in r.headers:
signal = int(r.headers["X-MARS-SIGNAL"])
LOG.error(f"MARS client kill by signal {signal}")
if "X-MARS-RETRY-SAME-HOST" in r.headers:
retry_same_host = int(r.headers["X-MARS-RETRY-SAME-HOST"])
if "X-MARS-RETRY-NEXT-HOST" in r.headers:
retry_next_host = int(r.headers["X-MARS-RETRY-NEXT-HOST"])
return Result(
error=error,
message=r.text or str(error),
retry_same_host=retry_same_host,
retry_next_host=retry_next_host or retry_same_host,
)
uid = r.headers["X-MARS-UID"]
if code == http.HTTPStatus.BAD_REQUEST:
if "X-MARS-EXIT-CODE" in r.headers:
exitcode = int(r.headers["X-MARS-EXIT-CODE"])
LOG.error(f"MARS client exited with code {exitcode}")
if code == http.HTTPStatus.OK:
try:
self._transfer(r)
except urllib3.exceptions.ProtocolError as e:
LOG.exception("Error transferring file (1)")
return Result(error=e, retry_same_host=True, retry_next_host=True)
except Exception as e:
LOG.exception("Error transferring file (2)")
return Result(error=e)
logfile = None
try:
r = requests.get(self.url + "/" + uid)
r.raise_for_status()
logfile = r.text
except (requests.exceptions.HTTPError, requests.exceptions.ConnectionError):
LOG.exception("Error getting log file")
try:
r = requests.delete(self.url + "/" + uid)
r.raise_for_status()
self.uid = None
except (requests.exceptions.HTTPError, requests.exceptions.ConnectionError):
LOG.exception("Error deleting log file")
return Result(error=error, message=logfile or str(error))
def __del__(self):
try:
if self.uid is not None:
requests.delete(self.url + "/" + self.uid)
except Exception:
pass
class RemoteMarsClient:
def __init__(self, url, retries=3, delay=10, timeout=60):
self.url = url
self.retries = retries
self.delay = delay
self.timeout = timeout
def execute(self, request, environ, target):
session = RemoteMarsClientSession(
self.url, request, environ, target, self.timeout
)
for i in range(self.retries):
reply = session.execute()
if not reply.error:
return reply
if not reply.retry_same_host:
return reply
LOG.error(f"Error {reply}")
LOG.error(f"Retry on the same host {self.url}")
time.sleep(self.delay)
return reply
class RemoteMarsClientCluster:
def __init__(self, urls, retries=3, delay=10, timeout=60):
self.urls = urls
self.retries = retries
self.delay = delay
self.timeout = timeout
def execute(self, request, environ, target):
random.shuffle(self.urls)
for url in self.urls:
client = RemoteMarsClient(url, self.retries, self.delay, self.timeout)
reply = client.execute(request, environ, target)
if not reply.error:
return reply
if not reply.retry_next_host:
return reply
LOG.error(f"Error {reply}")
LOG.error(f"Retry on the next host {url}")
return reply
if __name__ == "__main__":
logging.basicConfig(
level=logging.INFO,
format="%(asctime)s %(process)d %(levelname)s %(module)s - %(funcName)s: %(message)s",
datefmt="%Y-%m-%d %H:%M:%S",
)
if False:
urls = ["http://localhost:9000"]
else:
urls = [
"http://mars-worker-2000.shared.compute.cci2.ecmwf.int:9000",
"http://mars-worker-2001.shared.compute.cci2.ecmwf.int:9000",
"http://mars-worker-1000.shared.compute.cci1.ecmwf.int:9000",
"http://mars-worker-1001.shared.compute.cci1.ecmwf.int:9000",
]
cluster = RemoteMarsClientCluster(
urls=urls,
retries=3,
delay=10,
# timeout=None,
)
request = json.load(open(sys.argv[1]))
environ = dict(uid="test")
reply = cluster.execute(request, environ, "target.grib")
print(reply.message)
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