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import requests
import json
import time
import datetime
import os
def bytes_to_string(n):
u = ['', 'K', 'M', 'G', 'T', 'P']
i = 0
while n >= 1024:
n /= 1024.0
i += 1
return "%g%s" % (int(n * 10 + 0.5) / 10.0, u[i])
def robust(call):
def wrapped(*args, **kwargs):
return call(*args, **kwargs)
return wrapped
class Client(object):
def __init__(self,
end_point=os.environ.get("CDSAPI_URL"),
api_key=os.environ.get("CDSAPI_KEY"),
verbose=False,
verify=None,
timeout=None, full_stack=False):
dotrc = os.environ.get("CDSAPI_RC", os.path.expanduser('~/.cdsapirc'))
if end_point is None or api_key is None:
if os.path.exists(dotrc):
config = {}
with open(dotrc) as f:
for l in f.readlines():
k, v = l.strip().split(':', 1)
config[k] = v.strip()
url = config.get('url')
key = config.get('key')
if api_key is None:
api_key = key
if end_point is None:
end_point = url
if verify is None:
verify = int(config.get('verify', 1))
if end_point is None or api_key is None or api_key is None:
raise Exception("Missing/incomplete configuration file: %s" % (dotrc))
self.end_point = end_point
self.api_key = api_key
self.verbose = verbose
self.verify = True if verify else False
self.timeout = timeout
self.sleep_max = 120
self.full_stack = full_stack
self._trace(dict(end_point=self.end_point,
api_key=self.api_key,
verbose=self.verbose,
verify=self.verify,
timeout=self.timeout,
sleep_max=self.sleep_max,
full_stack=self.full_stack,
))
def get_resource(self, name, request, target=None):
self._api("%s/resources/%s" % (self.end_point, name), request, target)
def _download(self, url, size, local_filename=None):
if local_filename is None:
local_filename = url.split('/')[-1]
r = robust(requests.get)(url, stream=True, verify=self.verify)
total = 0
with open(local_filename, 'wb') as f:
for chunk in r.iter_content(chunk_size=1024):
if chunk:
f.write(chunk)
total += len(chunk)
assert total == size
return local_filename
def _api(self, url, request, target):
session = requests.Session()
session.auth = tuple(self.api_key.split(':', 2))
self._trace("POST %s %s" % (url, json.dumps(request)))
result = robust(session.post)(url, json=request, verify=self.verify)
reply = {}
print(result)
try:
reply = result.json()
result.raise_for_status()
reply = result.json()
except Exception:
if 'message' in reply:
error = reply['message']
if 'context' in reply and 'required_terms' in reply['context']:
e = [error]
for t in reply['context']['required_terms']:
e.append("To access this resource, you first need to accept the terms of '%s' at %s" %
(t['title'], t['url']))
error = '. '.join(e)
raise Exception(error)
else:
raise
sleep = 1
start = time.time()
while True:
self._trace(reply)
if reply['state'] == 'completed':
if target:
self._download(reply['location'], int(reply['content_length']), target)
else:
self._trace("HEAD %s" % (reply['location'],))
metadata = robust(session.head)(reply['location'], verify=self.verify)
metadata.raise_for_status()
self._trace(metadata.headers)
if 'request_id' in reply:
rid = reply['request_id']
task_url = "%s/tasks/%s" % (self.end_point, rid)
self._trace("DELETE %s" % (task_url,))
delete = session.delete(task_url, verify=self.verify)
self._trace("DELETE returns %s %s" % (delete.status_code, delete.reason))
try:
delete.raise_for_status()
except Exception:
self._warning("DELETE %s returns %s %s" % (task_url, delete.status_code, delete.reason))
self._trace("Done")
return
if reply['state'] in ('queued', 'running'):
rid = reply['request_id']
if self.timeout and (time.time() - start > self.timeout):
raise Exception("TIMEOUT")
self._trace("Request ID is %s, sleep %s" % (rid, sleep))
time.sleep(sleep)
sleep *= 1.5
if sleep > self.sleep_max:
sleep = self.sleep_max
task_url = "%s/tasks/%s" % (self.end_point, rid)
self._trace("GET %s" % (task_url,))
result = robust(session.get)(task_url, verify=self.verify)
result.raise_for_status()
reply = result.json()
continue
if reply['state'] in ('failed',):
print("Message: %s" % (reply['error'].get("message"),))
print("Reason: %s" % (reply['error'].get("reason"),))
for n in reply.get('error', {}).get('context', {}).get('traceback', '').split('\n'):
if n.strip() == '' and not self.full_stack:
break
print(" %s" % (n,))
raise Exception(reply['error'].get("reason"),)
raise Exception("Unknown API state [%s]" % (reply['state'],))
def _trace(self, what):
if isinstance(what, (dict, list)):
what = json.dumps(what, indent=4, sort_keys=True)
ts = "{:%Y-%m-%d %H:%M:%S}".format(datetime.datetime.now())
print('CDS-API %s %s' % (ts, what))
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