From: David-Sarah Hopwood Date: Tue, 19 Feb 2013 18:47:14 +0000 (+0000) Subject: OpenStack: add _http_request helper. X-Git-Url: https://git.rkrishnan.org/Site/Content/Exhibitors/class-simplejson.JSONDecoder.html?a=commitdiff_plain;h=6ac386c0831c6298d3561761723db7f585aacac5;p=tahoe-lafs%2Ftahoe-lafs.git OpenStack: add _http_request helper. Signed-off-by: David-Sarah Hopwood --- diff --git a/src/allmydata/storage/backends/cloud/openstack/openstack_container.py b/src/allmydata/storage/backends/cloud/openstack/openstack_container.py index d40fc3d1..45a7d5b8 100644 --- a/src/allmydata/storage/backends/cloud/openstack/openstack_container.py +++ b/src/allmydata/storage/backends/cloud/openstack/openstack_container.py @@ -28,6 +28,8 @@ DEFAULT_AUTH_URLS = { "rackspace.co.uk": "https://lon.identity.api.rackspacecloud.com/v1.0", } +USER_AGENT = "Tahoe-LAFS OpenStack client" + def configure_openstack_container(storedir, config): api_key = config.get_or_create_private_config("openstack_api_key") provider = config.get_config("storage", "openstack.provider", "rackspace.com").lower() @@ -58,11 +60,48 @@ class AuthenticationInfo(object): self.auth_token = auth_token -def _check_response_code(response): - # "any 2xx response is a good response" - if response.code < 200 or response.code >= 300: - raise CloudServiceError("unexpected response code %r %s" % (response.code, response.phrase), - response.code, response.headers) +def _http_request(what, agent, method, url, request_headers, body=None, need_response_body=False): + # Agent.request adds a Host header automatically based on the URL. + request_headers['User-Agent'] = [USER_AGENT] + + if body is None: + bodyProducer = None + else: + bodyProducer = FileBodyProducer(StringIO(body)) + # We don't need to explicitly set Content-Length because FileBodyProducer knows the length + # (and if we do it won't work, because in that case Content-Length would be duplicated). + + log.msg(format="OpenStack %(what)s request %(method)s %(url)s %(headers)s", + what=what, method=method, url=url, headers=repr(request_headers), level=log.OPERATIONAL) + + d = defer.maybeDeferred(agent.request, method, url, Headers(request_headers), bodyProducer) + + def _got_response(response): + log.msg(format="OpenStack %(what)s response: %(code)d %(phrase)s", + what=what, code=response.code, phrase=response.phrase, level=log.OPERATIONAL) + + if response.code < 200 or response.code >= 300: + raise CloudServiceError(None, response.code, + message="unexpected response code %r %s" % (response.code, response.phrase)) + + if need_response_body: + collector = DataCollector() + response.deliverBody(collector) + d2 = collector.when_done() + d2.addCallback(lambda body: (response, body)) + return d2 + else: + response.deliverBody(Discard()) + return (response, None) + d.addCallback(_got_response) + return d + +def _get_header(response, name): + hs = response.headers.getRawHeaders(name) + if len(hs) == 0: + raise CloudServiceError(None, response.code, + message="missing response header %r" % (name,)) + return hs[0] class AuthenticationClient(object): @@ -180,8 +219,6 @@ class DataCollector(Protocol): class OpenStackContainer(ContainerRetryMixin): implements(IContainer) - USER_AGENT = 'Tahoe-LAFS OpenStack client' - def __init__(self, auth_client, container_name, override_reactor=None): self._auth_client = auth_client self._container_name = container_name @@ -220,45 +257,41 @@ class OpenStackContainer(ContainerRetryMixin): d = self._auth_client.get_auth_info() def _do_list(auth_info): request_headers = { - 'User-Agent': [self.USER_AGENT], 'X-Auth-Token': [auth_info.auth_token], } url = self._make_container_url(auth_info) if prefix: url += "?format=json&prefix=%s" % (urllib.quote(prefix, safe=''),) - log.msg(format="OpenStack list GET %(url)s", url=url, level=log.OPERATIONAL) - return self._agent.request('GET', url, Headers(request_headers), None) + return _http_request("list objects", self._agent, 'GET', url, request_headers, None, need_response_body=True) d.addCallback(_do_list) - def _got_list_response(response): - log.msg(format="OpenStack list GET response: %(code)d %(phrase)s", - code=response.code, phrase=response.phrase, level=log.OPERATIONAL) - _check_response_code(response) + d.addCallback(lambda (response, json): self._parse_list(response, json, prefix)) + return d - collector = DataCollector() - response.deliverBody(collector) - return collector.when_done() - d.addCallback(_got_list_response) - def _parse_list(json): + def _parse_list(self, response, json, prefix): + try: items = simplejson.loads(json) - log.msg(format="OpenStack list GET read %(length)d bytes, parsed as %(items)d items", - length=len(json), items=len(items), level=log.OPERATIONAL) - - def _make_containeritem(item): - try: - key = item['name'] - size = item['bytes'] - modification_date = item['last_modified'] - etag = item['hash'] - storage_class = 'STANDARD' - except KeyError, e: - raise self.ServiceError(str(e)) - else: - return ContainerItem(key, modification_date, etag, size, storage_class) - - contents = map(_make_containeritem, items) - return ContainerListing(self._container_name, prefix, None, 10000, "false", contents=contents) - d.addCallback(_parse_list) - return d + except simplejson.decoder.JSONDecodeError, e: + raise self.ServiceError(None, response.code, + message="could not decode list response: %s" % (e,)) + + log.msg(format="OpenStack list read %(length)d bytes, parsed as %(items)d items", + length=len(json), items=len(items), level=log.OPERATIONAL) + + def _make_containeritem(item): + try: + key = item['name'] + size = item['bytes'] + modification_date = item['last_modified'] + etag = item['hash'] + storage_class = 'STANDARD' + except KeyError, e: + raise self.ServiceError(None, response.code, + message="missing field in list response: %s" % (e,)) + else: + return ContainerItem(key, modification_date, etag, size, storage_class) + + contents = map(_make_containeritem, items) + return ContainerListing(self._container_name, prefix, None, 10000, "false", contents=contents) def _put_object(self, object_name, data, content_type='application/octet-stream', metadata={}): """ @@ -267,26 +300,14 @@ class OpenStackContainer(ContainerRetryMixin): """ d = self._auth_client.get_auth_info() def _do_put(auth_info): - content_length = len(data) request_headers = { - 'User-Agent': [self.USER_AGENT], 'X-Auth-Token': [auth_info.auth_token], 'Content-Type': [content_type], - 'Content-Length': [content_length], } - producer = FileBodyProducer(StringIO(data)) url = self._make_object_url(auth_info, object_name) - log.msg(format="OpenStack PUT %(url)s %(content_length)d", - url=url, content_length=content_length, level=log.OPERATIONAL) - return self._agent.request('PUT', url, Headers(request_headers), producer) + return _http_request("put object", self._agent, 'PUT', url, request_headers, data) d.addCallback(_do_put) - def _got_put_response(response): - log.msg(format="OpenStack PUT response: %(code)d %(phrase)s", - code=response.code, phrase=response.phrase, level=log.OPERATIONAL) - _check_response_code(response) - - response.deliverBody(Discard()) - d.addCallback(_got_put_response) + d.addCallback(lambda ign: None) return d def _get_object(self, object_name): @@ -296,22 +317,12 @@ class OpenStackContainer(ContainerRetryMixin): d = self._auth_client.get_auth_info() def _do_get(auth_info): request_headers = { - 'User-Agent': [self.USER_AGENT], 'X-Auth-Token': [auth_info.auth_token], } url = self._make_object_url(auth_info, object_name) - log.msg(format="OpenStack GET %(url)s", url=url, level=log.OPERATIONAL) - return self._agent.request('GET', url, Headers(request_headers), None) + return _http_request("get object", self._agent, 'GET', url, request_headers, need_response_body=True) d.addCallback(_do_get) - def _got_get_response(response): - log.msg(format="OpenStack GET response: %(code)d %(phrase)s", - code=response.code, phrase=response.phrase, level=log.OPERATIONAL) - _check_response_code(response) - - collector = DataCollector() - response.deliverBody(collector) - return collector.when_done() - d.addCallback(_got_get_response) + d.addCallback(lambda (response, body): body) return d def _head_object(self, object_name): @@ -328,20 +339,12 @@ class OpenStackContainer(ContainerRetryMixin): d = self._auth_client.get_auth_info() def _do_delete(auth_info): request_headers = { - 'User-Agent': [self.USER_AGENT], 'X-Auth-Token': [auth_info.auth_token], } url = self._make_object_url(auth_info, object_name) - log.msg(format="OpenStack DELETE %(url)s", url=url, level=log.OPERATIONAL) - return self._agent.request('DELETE', url, Headers(request_headers), None) + return _http_request("delete", self._agent, 'DELETE', url, request_headers) d.addCallback(_do_delete) - def _got_delete_response(response): - log.msg(format="OpenStack DELETE response: %(code)d %(phrase)s", - code=response.code, phrase=response.phrase, level=log.OPERATIONAL) - _check_response_code(response) - - response.deliverBody(Discard()) - d.addCallback(_got_delete_response) + d.addCallback(lambda ign: None) return d def create(self):