# Copyright (C) The Arvados Authors. All rights reserved.
#
# SPDX-License-Identifier: Apache-2.0
+"""Arvados API client
+
+The code in this module builds Arvados API client objects you can use to submit
+Arvados API requests. This includes extending the underlying HTTP client with
+niceties such as caching, X-Request-Id header for tracking, and more. The main
+client constructors are `api` and `api_from_config`.
+"""
from __future__ import absolute_import
from future import standard_library
"""Model class for JSON that preserves the contents' order.
API clients that care about preserving the order of fields in API
- server responses can use this model to do so, like this::
+ server responses can use this model to do so, like this:
from arvados.api import OrderedJsonModel
client = arvados.api('v1', ..., model=OrderedJsonModel())
return None
return cache.SafeHTTPCache(path, max_age=60*60*24*2)
-def api(version=None, cache=True, host=None, token=None, insecure=False,
- request_id=None, timeout=5*60, **kwargs):
- """Return an apiclient Resources object for an Arvados instance.
-
- :version:
- A string naming the version of the Arvados API to use (for
- example, 'v1').
-
- :cache:
- Use a cache (~/.cache/arvados/discovery) for the discovery
- document.
-
- :host:
- The Arvados API server host (and optional :port) to connect to.
-
- :token:
- The authentication token to send with each API call.
-
- :insecure:
- If True, ignore SSL certificate validation errors.
-
- :timeout:
- A timeout value for http requests.
-
- :request_id:
- Default X-Request-Id header value for outgoing requests that
- don't already provide one. If None or omitted, generate a random
+def api_client(
+ version,
+ discoveryServiceUrl,
+ token,
+ *,
+ cache=True,
+ http=None,
+ insecure=False,
+ request_id=None,
+ timeout=5*60,
+ **kwargs,
+):
+ """Build an Arvados API client
+
+ This function returns a `googleapiclient.discovery.Resource` object
+ constructed from the given arguments. This is a relatively low-level
+ interface that requires all the necessary inputs as arguments. Most
+ users will prefer to use `api` which can accept more flexible inputs.
+
+ Arguments:
+
+ version: str
+ : A string naming the version of the Arvados API to use.
+
+ discoveryServiceUrl: str
+ : The URL used to discover APIs passed directly to
+ `googleapiclient.discovery.build`.
+
+ token: str
+ : The authentication token to send with each API call.
+
+ Keyword-only arguments:
+
+ cache: bool
+ : If true, loads the API discovery document from, or saves it to, a cache
+ on disk (located at `~/.cache/arvados/discovery`).
+
+ http: httplib2.Http | None
+ : The HTTP client object the API client object will use to make requests.
+ If not provided, this function will build its own to use. Either way, the
+ object will be patched as part of the build process.
+
+ insecure: bool
+ : If true, ignore SSL certificate validation errors. Default `False`.
+
+ request_id: str | None
+ : Default `X-Request-Id` header value for outgoing requests that
+ don't already provide one. If `None` or omitted, generate a random
ID. When retrying failed requests, the same ID is used on all
attempts.
- Additional keyword arguments will be passed directly to
- `apiclient_discovery.build` if a new Resource object is created.
- If the `discoveryServiceUrl` or `http` keyword arguments are
- missing, this function will set default values for them, based on
- the current Arvados configuration settings.
+ timeout: int
+ : A timeout value for HTTP requests in seconds. Default 300 (5 minutes).
+ Additional keyword arguments will be passed directly to
+ `googleapiclient.discovery.build`.
"""
-
- if not version:
- version = 'v1'
- _logger.info("Using default API version. " +
- "Call arvados.api('%s') instead." %
- version)
- if 'discoveryServiceUrl' in kwargs:
- if host:
- raise ValueError("both discoveryServiceUrl and host provided")
- # Here we can't use a token from environment, config file,
- # etc. Those probably have nothing to do with the host
- # provided by the caller.
- if not token:
- raise ValueError("discoveryServiceUrl provided, but token missing")
- elif host and token:
- pass
- elif not host and not token:
- return api_from_config(
- version=version, cache=cache, timeout=timeout,
- request_id=request_id, **kwargs)
- else:
- # Caller provided one but not the other
- if not host:
- raise ValueError("token argument provided, but host missing.")
- else:
- raise ValueError("host argument provided, but token missing.")
-
- if host:
- # Caller wants us to build the discoveryServiceUrl
- kwargs['discoveryServiceUrl'] = (
- 'https://%s/discovery/v1/apis/{api}/{apiVersion}/rest' % (host,))
-
- if 'http' not in kwargs:
- http_kwargs = {'ca_certs': util.ca_certs_path()}
- if cache:
- http_kwargs['cache'] = http_cache('discovery')
- if insecure:
- http_kwargs['disable_ssl_certificate_validation'] = True
- kwargs['http'] = httplib2.Http(**http_kwargs)
-
- if kwargs['http'].timeout is None:
- kwargs['http'].timeout = timeout
-
- kwargs['http'] = _patch_http_request(kwargs['http'], token)
-
- svc = apiclient_discovery.build('arvados', version, cache_discovery=False, **kwargs)
+ if http is None:
+ http = httplib2.Http(
+ ca_certs=util.ca_certs_path(),
+ cache=http_cache('discovery') if cache else None,
+ disable_ssl_certificate_validation=bool(insecure),
+ )
+ if http.timeout is None:
+ http.timeout = timeout
+ http = _patch_http_request(http, token)
+
+ svc = apiclient_discovery.build(
+ 'arvados', version,
+ cache_discovery=False,
+ discoveryServiceUrl=discoveryServiceUrl,
+ http=http,
+ **kwargs,
+ )
svc.api_token = token
svc.insecure = insecure
svc.request_id = request_id
svc.config = lambda: util.get_config_once(svc)
svc.vocabulary = lambda: util.get_vocabulary_once(svc)
svc.close_connections = types.MethodType(_close_connections, svc)
- kwargs['http'].max_request_size = svc._rootDesc.get('maxRequestSize', 0)
- kwargs['http'].cache = None
- kwargs['http']._request_id = lambda: svc.request_id or util.new_request_id()
+ http.max_request_size = svc._rootDesc.get('maxRequestSize', 0)
+ http.cache = None
+ http._request_id = lambda: svc.request_id or util.new_request_id()
return svc
-def api_from_config(version=None, apiconfig=None, **kwargs):
- """Return an apiclient Resources object enabling access to an Arvados server
- instance.
+def normalize_api_kwargs(
+ version=None,
+ discoveryServiceUrl=None,
+ host=None,
+ token=None,
+ **kwargs,
+):
+ """Validate kwargs from `api` and build kwargs for `api_client`
- :version:
- A string naming the version of the Arvados REST API to use (for
- example, 'v1').
+ This method takes high-level keyword arguments passed to the `api`
+ constructor and normalizes them into a new dictionary that can be passed
+ as keyword arguments to `api_client`. It raises `ValueError` if required
+ arguments are missing or conflict.
- :apiconfig:
- If provided, this should be a dict-like object (must support the get()
- method) with entries for ARVADOS_API_HOST, ARVADOS_API_TOKEN, and
- optionally ARVADOS_API_HOST_INSECURE. If not provided, use
- arvados.config (which gets these parameters from the environment by
- default.)
+ Arguments:
- Other keyword arguments such as `cache` will be passed along `api()`
+ version: str | None
+ : A string naming the version of the Arvados API to use. If not specified,
+ the code will log a warning and fall back to 'v1'.
+ discoveryServiceUrl: str | None
+ : The URL used to discover APIs passed directly to
+ `googleapiclient.discovery.build`. It is an error to pass both
+ `discoveryServiceUrl` and `host`.
+
+ host: str | None
+ : The hostname and optional port number of the Arvados API server. Used to
+ build `discoveryServiceUrl`. It is an error to pass both
+ `discoveryServiceUrl` and `host`.
+
+ token: str
+ : The authentication token to send with each API call.
+
+ Additional keyword arguments will be included in the return value.
+ """
+ if discoveryServiceUrl and host:
+ raise ValueError("both discoveryServiceUrl and host provided")
+ elif discoveryServiceUrl:
+ url_src = "discoveryServiceUrl"
+ elif host:
+ url_src = "host argument"
+ discoveryServiceUrl = 'https://%s/discovery/v1/apis/{api}/{apiVersion}/rest' % (host,)
+ elif token:
+ # This specific error message gets priority for backwards compatibility.
+ raise ValueError("token argument provided, but host missing.")
+ else:
+ raise ValueError("neither discoveryServiceUrl nor host provided")
+ if not token:
+ raise ValueError("%s provided, but token missing" % (url_src,))
+ if not version:
+ version = 'v1'
+ _logger.info(
+ "Using default API version. Call arvados.api(%r) instead.",
+ version,
+ )
+ return {
+ 'discoveryServiceUrl': discoveryServiceUrl,
+ 'token': token,
+ 'version': version,
+ **kwargs,
+ }
+
+def api_kwargs_from_config(version=None, apiconfig=None, **kwargs):
+ """Build `api_client` keyword arguments from configuration
+
+ This function accepts a mapping with Arvados configuration settings like
+ `ARVADOS_API_HOST` and converts them into a mapping of keyword arguments
+ that can be passed to `api_client`. If `ARVADOS_API_HOST` or
+ `ARVADOS_API_TOKEN` are not configured, it raises `ValueError`.
+
+ Arguments:
+
+ version: str | None
+ : A string naming the version of the Arvados API to use. If not specified,
+ the code will log a warning and fall back to 'v1'.
+
+ apiconfig: Mapping[str, str] | None
+ : A mapping with entries for `ARVADOS_API_HOST`, `ARVADOS_API_TOKEN`, and
+ optionally `ARVADOS_API_HOST_INSECURE`. If not provided, calls
+ `arvados.config.settings` to get these parameters from user configuration.
+
+ Additional keyword arguments will be included in the return value.
"""
- # Load from user configuration or environment
if apiconfig is None:
apiconfig = config.settings()
+ missing = " and ".join(
+ key
+ for key in ['ARVADOS_API_HOST', 'ARVADOS_API_TOKEN']
+ if key not in apiconfig
+ )
+ if missing:
+ raise ValueError(
+ "%s not set.\nPlease set in %s or export environment variable." %
+ (missing, config.default_config_file),
+ )
+ return normalize_api_kwargs(
+ version,
+ None,
+ apiconfig['ARVADOS_API_HOST'],
+ apiconfig['ARVADOS_API_TOKEN'],
+ insecure=config.flag_is_true('ARVADOS_API_HOST_INSECURE', apiconfig),
+ **kwargs,
+ )
+
+def api(version=None, cache=True, host=None, token=None, insecure=False,
+ request_id=None, timeout=5*60, *,
+ discoveryServiceUrl=None, **kwargs):
+ """Dynamically build an Arvados API client
+
+ This function provides a high-level "do what I mean" interface to build an
+ Arvados API client object. You can call it with no arguments to build a
+ client from user configuration; pass `host` and `token` arguments just
+ like you would write in user configuration; or pass additional arguments
+ for lower-level control over the client.
+
+ Arguments:
+
+ version: str | None
+ : A string naming the version of the Arvados API to use. If not specified,
+ the code will log a warning and fall back to 'v1'.
+
+ host: str | None
+ : The hostname and optional port number of the Arvados API server.
+
+ token: str | None
+ : The authentication token to send with each API call.
+
+ discoveryServiceUrl: str | None
+ : The URL used to discover APIs passed directly to
+ `googleapiclient.discovery.build`.
+
+ If `host`, `token`, and `discoveryServiceUrl` are all omitted, `host` and
+ `token` will be loaded from the user's configuration. Otherwise, you must
+ pass `token` and one of `host` or `discoveryServiceUrl`. It is an error to
+ pass both `host` and `discoveryServiceUrl`.
- errors = []
- for x in ['ARVADOS_API_HOST', 'ARVADOS_API_TOKEN']:
- if x not in apiconfig:
- errors.append(x)
- if errors:
- raise ValueError(" and ".join(errors)+" not set.\nPlease set in %s or export environment variable." % config.default_config_file)
- host = apiconfig.get('ARVADOS_API_HOST')
- token = apiconfig.get('ARVADOS_API_TOKEN')
- insecure = config.flag_is_true('ARVADOS_API_HOST_INSECURE', apiconfig)
-
- return api(version=version, host=host, token=token, insecure=insecure, **kwargs)
+ Other arguments are passed directly to `api_client`. See that function's
+ docstring for more information about their meaning.
+ """
+ if discoveryServiceUrl or host or token:
+ # We pass `insecure` here for symmetry with `api_kwargs_from_config`.
+ client_kwargs = normalize_api_kwargs(
+ version, discoveryServiceUrl, host, token,
+ insecure=insecure,
+ )
+ else:
+ client_kwargs = api_kwargs_from_config(version)
+ return api_client(
+ **client_kwargs,
+ cache=cache,
+ request_id=request_id,
+ timeout=timeout,
+ **kwargs,
+ )
+
+def api_from_config(version=None, apiconfig=None, **kwargs):
+ """Build an Arvados API client from a configuration mapping
+
+ This function builds an Arvados API client from a mapping with user
+ configuration. It accepts that mapping as an argument, so you can use a
+ configuration that's different from what the user has set up.
+
+ Arguments:
+
+ version: str | None
+ : A string naming the version of the Arvados API to use. If not specified,
+ the code will log a warning and fall back to 'v1'.
+
+ apiconfig: Mapping[str, str] | None
+ : A mapping with entries for `ARVADOS_API_HOST`, `ARVADOS_API_TOKEN`, and
+ optionally `ARVADOS_API_HOST_INSECURE`. If not provided, calls
+ `arvados.config.settings` to get these parameters from user configuration.
+
+ Other arguments are passed directly to `api_client`. See that function's
+ docstring for more information about their meaning.
+ """
+ return api_client(**api_kwargs_from_config(version, apiconfig, **kwargs))
# Copyright (C) The Arvados Authors. All rights reserved.
#
# SPDX-License-Identifier: Apache-2.0
+"""Thread-safe wrapper for an Arvados API client
+
+This module provides `ThreadSafeApiCache`, a thread-safe, API-compatible
+Arvados API client.
+"""
from __future__ import absolute_import
from builtins import object
-import copy
import threading
-import arvados
-import arvados.keep as keep
-import arvados.config as config
+from . import api
+from . import config
+from . import keep
class ThreadSafeApiCache(object):
- """Threadsafe wrapper for API objects.
+ """Thread-safe wrapper for an Arvados API client
- This stores and returns a different api object per thread, because httplib2
- which underlies apiclient is not threadsafe.
+ This class takes all the arguments necessary to build a lower-level
+ Arvados API client `googleapiclient.discovery.Resource`, then
+ transparently builds and wraps a unique object per thread. This works
+ around the fact that the client's underlying HTTP client object is not
+ thread-safe.
- """
+ Arguments:
- def __init__(self, apiconfig=None, keep_params={}, api_params={}):
- if apiconfig is None:
- apiconfig = config.settings()
- self.apiconfig = copy.copy(apiconfig)
- self.api_params = api_params
- self.local = threading.local()
+ apiconfig: Mapping[str, str] | None
+ : A mapping with entries for `ARVADOS_API_HOST`, `ARVADOS_API_TOKEN`,
+ and optionally `ARVADOS_API_HOST_INSECURE`. If not provided, uses
+ `arvados.config.settings` to get these parameters from user
+ configuration. You can pass an empty mapping to build the client
+ solely from `api_params`.
+
+ keep_params: Mapping[str, Any]
+ : Keyword arguments used to construct an associated
+ `arvados.keep.KeepClient`.
- # Initialize an API object for this thread before creating
- # KeepClient, this will report if ARVADOS_API_HOST or
- # ARVADOS_API_TOKEN are missing.
- self.localapi()
+ api_params: Mapping[str, Any]
+ : Keyword arguments used to construct each thread's API client. These
+ have the same meaning as in the `arvados.api.api` function.
+ version: str | None
+ : A string naming the version of the Arvados API to use. If not specified,
+ the code will log a warning and fall back to 'v1'.
+ """
+
+ def __init__(self, apiconfig=None, keep_params={}, api_params={}, version=None):
+ if apiconfig or apiconfig is None:
+ self._api_kwargs = api.api_kwargs_from_config(version, apiconfig, **api_params)
+ else:
+ self._api_kwargs = api.normalize_api_kwargs(version, **api_params)
+ self.api_token = self._api_kwargs['token']
+ self.local = threading.local()
self.keep = keep.KeepClient(api_client=self, **keep_params)
def localapi(self):
if 'api' not in self.local.__dict__:
- self.local.api = arvados.api_from_config('v1', apiconfig=self.apiconfig,
- **self.api_params)
+ self.local.api = api.api_client(**self._api_kwargs)
return self.local.api
def __getattr__(self, name):
# Proxy nonexistent attributes to the thread-local API client.
- if name == "api_token":
- return self.apiconfig['ARVADOS_API_TOKEN']
return getattr(self.localapi(), name)
projects / arvados.git / commitdiff