1 from __future__ import absolute_import
2 from future import standard_library
3 standard_library.install_aliases()
4 from builtins import range
17 from apiclient import discovery as apiclient_discovery
18 from apiclient import errors as apiclient_errors
24 _logger = logging.getLogger('arvados.api')
26 MAX_IDLE_CONNECTION_DURATION = 30
27 RETRY_DELAY_INITIAL = 2
28 RETRY_DELAY_BACKOFF = 2
31 class OrderedJsonModel(apiclient.model.JsonModel):
32 """Model class for JSON that preserves the contents' order.
34 API clients that care about preserving the order of fields in API
35 server responses can use this model to do so, like this::
37 from arvados.api import OrderedJsonModel
38 client = arvados.api('v1', ..., model=OrderedJsonModel())
41 def deserialize(self, content):
42 # This is a very slightly modified version of the parent class'
43 # implementation. Copyright (c) 2010 Google.
44 content = content.decode('utf-8')
45 body = json.loads(content, object_pairs_hook=collections.OrderedDict)
46 if self._data_wrapper and isinstance(body, dict) and 'data' in body:
51 def _intercept_http_request(self, uri, **kwargs):
52 if (self.max_request_size and
53 kwargs.get('body') and
54 self.max_request_size < len(kwargs['body'])):
55 raise apiclient_errors.MediaUploadSizeError("Request size %i bytes exceeds published limit of %i bytes" % (len(kwargs['body']), self.max_request_size))
57 if 'headers' not in kwargs:
58 kwargs['headers'] = {}
60 if config.get("ARVADOS_EXTERNAL_CLIENT", "") == "true":
61 kwargs['headers']['X-External-Client'] = '1'
63 kwargs['headers']['Authorization'] = 'OAuth2 %s' % self.arvados_api_token
65 retryable = kwargs.get('method', 'GET') in [
66 'DELETE', 'GET', 'HEAD', 'OPTIONS', 'PUT']
67 retry_count = self._retry_count if retryable else 0
70 time.time() - self._last_request_time > self._max_keepalive_idle):
71 # High probability of failure due to connection atrophy. Make
72 # sure this request [re]opens a new connection by closing and
73 # forgetting all cached connections first.
74 for conn in self.connections.values():
76 self.connections.clear()
78 delay = self._retry_delay_initial
79 for _ in range(retry_count):
80 self._last_request_time = time.time()
82 return self.orig_http_request(uri, **kwargs)
83 except http.client.HTTPException:
84 _logger.debug("Retrying API request in %d s after HTTP error",
87 # This is the one case where httplib2 doesn't close the
88 # underlying connection first. Close all open
89 # connections, expecting this object only has the one
90 # connection to the API server. This is safe because
91 # httplib2 reopens connections when needed.
92 _logger.debug("Retrying API request in %d s after socket error",
94 for conn in self.connections.values():
97 delay = delay * self._retry_delay_backoff
99 self._last_request_time = time.time()
100 return self.orig_http_request(uri, **kwargs)
102 def _patch_http_request(http, api_token):
103 http.arvados_api_token = api_token
104 http.max_request_size = 0
105 http.orig_http_request = http.request
106 http.request = types.MethodType(_intercept_http_request, http)
107 http._last_request_time = 0
108 http._max_keepalive_idle = MAX_IDLE_CONNECTION_DURATION
109 http._retry_delay_initial = RETRY_DELAY_INITIAL
110 http._retry_delay_backoff = RETRY_DELAY_BACKOFF
111 http._retry_count = RETRY_COUNT
114 # Monkey patch discovery._cast() so objects and arrays get serialized
115 # with json.dumps() instead of str().
116 _cast_orig = apiclient_discovery._cast
117 def _cast_objects_too(value, schema_type):
119 if (type(value) != type('') and
120 (schema_type == 'object' or schema_type == 'array')):
121 return json.dumps(value)
123 return _cast_orig(value, schema_type)
124 apiclient_discovery._cast = _cast_objects_too
126 # Convert apiclient's HttpErrors into our own API error subclass for better
128 # Reassigning apiclient_errors.HttpError is not sufficient because most of the
129 # apiclient submodules import the class into their own namespace.
130 def _new_http_error(cls, *args, **kwargs):
131 return super(apiclient_errors.HttpError, cls).__new__(
132 errors.ApiError, *args, **kwargs)
133 apiclient_errors.HttpError.__new__ = staticmethod(_new_http_error)
135 def http_cache(data_type):
136 homedir = os.environ.get('HOME')
137 if not homedir or len(homedir) == 0:
139 path = homedir + '/.cache/arvados/' + data_type
141 util.mkdir_dash_p(path)
144 return cache.SafeHTTPCache(path, max_age=60*60*24*2)
146 def api(version=None, cache=True, host=None, token=None, insecure=False, **kwargs):
147 """Return an apiclient Resources object for an Arvados instance.
150 A string naming the version of the Arvados API to use (for
154 Use a cache (~/.cache/arvados/discovery) for the discovery
158 The Arvados API server host (and optional :port) to connect to.
161 The authentication token to send with each API call.
164 If True, ignore SSL certificate validation errors.
166 Additional keyword arguments will be passed directly to
167 `apiclient_discovery.build` if a new Resource object is created.
168 If the `discoveryServiceUrl` or `http` keyword arguments are
169 missing, this function will set default values for them, based on
170 the current Arvados configuration settings.
176 _logger.info("Using default API version. " +
177 "Call arvados.api('%s') instead." %
179 if 'discoveryServiceUrl' in kwargs:
181 raise ValueError("both discoveryServiceUrl and host provided")
182 # Here we can't use a token from environment, config file,
183 # etc. Those probably have nothing to do with the host
184 # provided by the caller.
186 raise ValueError("discoveryServiceUrl provided, but token missing")
189 elif not host and not token:
190 return api_from_config(version=version, cache=cache, **kwargs)
192 # Caller provided one but not the other
194 raise ValueError("token argument provided, but host missing.")
196 raise ValueError("host argument provided, but token missing.")
199 # Caller wants us to build the discoveryServiceUrl
200 kwargs['discoveryServiceUrl'] = (
201 'https://%s/discovery/v1/apis/{api}/{apiVersion}/rest' % (host,))
203 if 'http' not in kwargs:
204 http_kwargs = {'ca_certs': util.ca_certs_path()}
206 http_kwargs['cache'] = http_cache('discovery')
208 http_kwargs['disable_ssl_certificate_validation'] = True
209 kwargs['http'] = httplib2.Http(**http_kwargs)
211 kwargs['http'] = _patch_http_request(kwargs['http'], token)
213 svc = apiclient_discovery.build('arvados', version, cache_discovery=False, **kwargs)
214 svc.api_token = token
215 svc.insecure = insecure
216 kwargs['http'].max_request_size = svc._rootDesc.get('maxRequestSize', 0)
217 kwargs['http'].cache = None
220 def api_from_config(version=None, apiconfig=None, **kwargs):
221 """Return an apiclient Resources object enabling access to an Arvados server
225 A string naming the version of the Arvados REST API to use (for
229 If provided, this should be a dict-like object (must support the get()
230 method) with entries for ARVADOS_API_HOST, ARVADOS_API_TOKEN, and
231 optionally ARVADOS_API_HOST_INSECURE. If not provided, use
232 arvados.config (which gets these parameters from the environment by
235 Other keyword arguments such as `cache` will be passed along `api()`
238 # Load from user configuration or environment
239 if apiconfig is None:
240 apiconfig = config.settings()
242 for x in ['ARVADOS_API_HOST', 'ARVADOS_API_TOKEN']:
243 if x not in apiconfig:
244 raise ValueError("%s is not set. Aborting." % x)
245 host = apiconfig.get('ARVADOS_API_HOST')
246 token = apiconfig.get('ARVADOS_API_TOKEN')
247 insecure = config.flag_is_true('ARVADOS_API_HOST_INSECURE', apiconfig)
249 return api(version=version, host=host, token=token, insecure=insecure, **kwargs)