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authorVictor Shyba <victor.shyba@gmail.com>2015-08-16 01:57:25 -0300
committerVictor Shyba <victor.shyba@gmail.com>2015-08-26 17:20:21 -0300
commit8adf2dedb74941352520d8de42326b0c59818728 (patch)
tree948b0ddc27b9164ba19e2e0709799f14eacba40a /client/src/leap/soledad
parent855def25b1c2f1f7278b6f6e0b1415ab26a995ef (diff)
[refactor] splits http_target into 4 modules
SoledadHTTPSyncTarget is composed of 4 main groups of responsibility: * api.py - Public and main methods of a SyncTarget * fetch.py - Document fetching logic * send.py - Document sending logic * support.py - Support functions and patches Previous single file had ~600 lines with those 4 logic groups mixed, making it harder to read and understand.
Diffstat (limited to 'client/src/leap/soledad')
-rw-r--r--client/src/leap/soledad/client/http_target/__init__.py45
-rw-r--r--client/src/leap/soledad/client/http_target/api.py251
-rw-r--r--client/src/leap/soledad/client/http_target/fetch.py237
-rw-r--r--client/src/leap/soledad/client/http_target/send.py101
-rw-r--r--client/src/leap/soledad/client/http_target/support.py154
5 files changed, 788 insertions, 0 deletions
diff --git a/client/src/leap/soledad/client/http_target/__init__.py b/client/src/leap/soledad/client/http_target/__init__.py
new file mode 100644
index 00000000..e77d20f5
--- /dev/null
+++ b/client/src/leap/soledad/client/http_target/__init__.py
@@ -0,0 +1,45 @@
+# -*- coding: utf-8 -*-
+# http_target.py
+# Copyright (C) 2015 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+"""
+A U1DB backend for encrypting data before sending to server and decrypting
+after receiving.
+"""
+
+
+import logging
+
+from leap.soledad.client.http_target.send import HTTPDocSender
+from leap.soledad.client.http_target.api import SyncTargetAPI
+from leap.soledad.client.http_target.fetch import HTTPDocFetcher
+
+
+logger = logging.getLogger(__name__)
+
+
+class SoledadHTTPSyncTarget(SyncTargetAPI, HTTPDocSender, HTTPDocFetcher):
+
+ """
+ A SyncTarget that encrypts data before sending and decrypts data after
+ receiving.
+
+ Normally encryption will have been written to the sync database upon
+ document modification. The sync database is also used to write temporarily
+ the parsed documents that the remote send us, before being decrypted and
+ written to the main database.
+ """
diff --git a/client/src/leap/soledad/client/http_target/api.py b/client/src/leap/soledad/client/http_target/api.py
new file mode 100644
index 00000000..9e677304
--- /dev/null
+++ b/client/src/leap/soledad/client/http_target/api.py
@@ -0,0 +1,251 @@
+import json
+import base64
+
+from uuid import uuid4
+from u1db import SyncTarget
+
+from twisted.web.error import Error
+from twisted.internet import defer
+
+from leap.soledad.common.errors import InvalidAuthTokenError
+from leap.soledad.client.http_target.support import readBody
+
+from leap.common.http import HTTPClient
+
+
+class SyncTargetAPI(SyncTarget):
+
+ def __init__(self, url, source_replica_uid, creds, crypto, cert_file,
+ sync_db=None, sync_enc_pool=None):
+ """
+ Initialize the sync target.
+
+ :param url: The server sync url.
+ :type url: str
+ :param source_replica_uid: The source replica uid which we use when
+ deferring decryption.
+ :type source_replica_uid: str
+ :param creds: A dictionary containing the uuid and token.
+ :type creds: creds
+ :param crypto: An instance of SoledadCrypto so we can encrypt/decrypt
+ document contents when syncing.
+ :type crypto: soledad.crypto.SoledadCrypto
+ :param cert_file: Path to the certificate of the ca used to validate
+ the SSL certificate used by the remote soledad
+ server.
+ :type cert_file: str
+ :param sync_db: Optional. handler for the db with the symmetric
+ encryption of the syncing documents. If
+ None, encryption will be done in-place,
+ instead of retreiving it from the dedicated
+ database.
+ :type sync_db: Sqlite handler
+ :param sync_enc_pool: The encryption pool to use to defer encryption.
+ If None is passed the encryption will not be
+ deferred.
+ :type sync_enc_pool: leap.soledad.client.encdecpool.SyncEncrypterPool
+ """
+ if url.endswith("/"):
+ url = url[:-1]
+ self._url = str(url) + "/sync-from/" + str(source_replica_uid)
+ self.source_replica_uid = source_replica_uid
+ self._auth_header = None
+ self.set_creds(creds)
+ self._crypto = crypto
+ self._sync_db = sync_db
+ self._sync_enc_pool = sync_enc_pool
+ self._insert_doc_cb = None
+ # asynchronous encryption/decryption attributes
+ self._decryption_callback = None
+ self._sync_decr_pool = None
+ self._http = HTTPClient(cert_file)
+
+ def close(self):
+ self._http.close()
+
+ def set_creds(self, creds):
+ """
+ Update credentials.
+
+ :param creds: A dictionary containing the uuid and token.
+ :type creds: dict
+ """
+ uuid = creds['token']['uuid']
+ token = creds['token']['token']
+ auth = '%s:%s' % (uuid, token)
+ b64_token = base64.b64encode(auth)
+ self._auth_header = {'Authorization': ['Token %s' % b64_token]}
+
+ @property
+ def _base_header(self):
+ return self._auth_header.copy() if self._auth_header else {}
+
+ @property
+ def _defer_encryption(self):
+ return self._sync_enc_pool is not None
+
+ def _http_request(self, url, method='GET', body=None, headers=None, content_type=None):
+ headers = headers or self._base_header
+ if content_type:
+ headers.update({'content-type': [content_type]})
+ d = self._http.request(url, method, body, headers, readBody)
+ d.addErrback(_unauth_to_invalid_token_error)
+ return d
+
+ @defer.inlineCallbacks
+ def get_sync_info(self, source_replica_uid):
+ """
+ Return information about known state of remote database.
+
+ Return the replica_uid and the current database generation of the
+ remote database, and its last-seen database generation for the client
+ replica.
+
+ :param source_replica_uid: The client-size replica uid.
+ :type source_replica_uid: str
+
+ :return: A deferred which fires with (target_replica_uid,
+ target_replica_generation, target_trans_id,
+ source_replica_last_known_generation,
+ source_replica_last_known_transaction_id)
+ :rtype: twisted.internet.defer.Deferred
+ """
+ raw = yield self._http_request(self._url)
+ res = json.loads(raw)
+ defer.returnValue([
+ res['target_replica_uid'],
+ res['target_replica_generation'],
+ res['target_replica_transaction_id'],
+ res['source_replica_generation'],
+ res['source_transaction_id']
+ ])
+
+ def record_sync_info(
+ self, source_replica_uid, source_replica_generation,
+ source_replica_transaction_id):
+ """
+ Record tip information for another replica.
+
+ After sync_exchange has been processed, the caller will have
+ received new content from this replica. This call allows the
+ source replica instigating the sync to inform us what their
+ generation became after applying the documents we returned.
+
+ This is used to allow future sync operations to not need to repeat data
+ that we just talked about. It also means that if this is called at the
+ wrong time, there can be database records that will never be
+ synchronized.
+
+ :param source_replica_uid: The identifier for the source replica.
+ :type source_replica_uid: str
+ :param source_replica_generation: The database generation for the
+ source replica.
+ :type source_replica_generation: int
+ :param source_replica_transaction_id: The transaction id associated
+ with the source replica
+ generation.
+ :type source_replica_transaction_id: str
+
+ :return: A deferred which fires with the result of the query.
+ :rtype: twisted.internet.defer.Deferred
+ """
+ data = json.dumps({
+ 'generation': source_replica_generation,
+ 'transaction_id': source_replica_transaction_id
+ })
+ return self._http_request(
+ self._url,
+ method='PUT',
+ body=data,
+ content_type='application/json')
+
+ @defer.inlineCallbacks
+ def sync_exchange(self, docs_by_generation, source_replica_uid,
+ last_known_generation, last_known_trans_id,
+ insert_doc_cb, ensure_callback=None,
+ defer_decryption=True, sync_id=None):
+ """
+ Find out which documents the remote database does not know about,
+ encrypt and send them. After that, receive documents from the remote
+ database.
+
+ :param docs_by_generations: A list of (doc_id, generation, trans_id)
+ of local documents that were changed since
+ the last local generation the remote
+ replica knows about.
+ :type docs_by_generations: list of tuples
+
+ :param source_replica_uid: The uid of the source replica.
+ :type source_replica_uid: str
+
+ :param last_known_generation: Target's last known generation.
+ :type last_known_generation: int
+
+ :param last_known_trans_id: Target's last known transaction id.
+ :type last_known_trans_id: str
+
+ :param insert_doc_cb: A callback for inserting received documents from
+ target. If not overriden, this will call u1db
+ insert_doc_from_target in synchronizer, which
+ implements the TAKE OTHER semantics.
+ :type insert_doc_cb: function
+
+ :param ensure_callback: A callback that ensures we know the target
+ replica uid if the target replica was just
+ created.
+ :type ensure_callback: function
+
+ :param defer_decryption: Whether to defer the decryption process using
+ the intermediate database. If False,
+ decryption will be done inline.
+ :type defer_decryption: bool
+
+ :return: A deferred which fires with the new generation and
+ transaction id of the target replica.
+ :rtype: twisted.internet.defer.Deferred
+ """
+
+ self._ensure_callback = ensure_callback
+
+ if sync_id is None:
+ sync_id = str(uuid4())
+ self.source_replica_uid = source_replica_uid
+
+ # save a reference to the callback so we can use it after decrypting
+ self._insert_doc_cb = insert_doc_cb
+
+ gen_after_send, trans_id_after_send = yield self._send_docs(
+ docs_by_generation,
+ last_known_generation,
+ last_known_trans_id,
+ sync_id)
+
+ cur_target_gen, cur_target_trans_id = yield self._receive_docs(
+ last_known_generation, last_known_trans_id,
+ ensure_callback, sync_id,
+ defer_decryption=defer_decryption)
+
+ # update gen and trans id info in case we just sent and did not
+ # receive docs.
+ if gen_after_send is not None and gen_after_send > cur_target_gen:
+ cur_target_gen = gen_after_send
+ cur_target_trans_id = trans_id_after_send
+
+ defer.returnValue([cur_target_gen, cur_target_trans_id])
+
+
+def _unauth_to_invalid_token_error(failure):
+ """
+ An errback to translate unauthorized errors to our own invalid token
+ class.
+
+ :param failure: The original failure.
+ :type failure: twisted.python.failure.Failure
+
+ :return: Either the original failure or an invalid auth token error.
+ :rtype: twisted.python.failure.Failure
+ """
+ failure.trap(Error)
+ if failure.getErrorMessage() == "401 Unauthorized":
+ raise InvalidAuthTokenError
+ return failure
diff --git a/client/src/leap/soledad/client/http_target/fetch.py b/client/src/leap/soledad/client/http_target/fetch.py
new file mode 100644
index 00000000..c4bb79a0
--- /dev/null
+++ b/client/src/leap/soledad/client/http_target/fetch.py
@@ -0,0 +1,237 @@
+# -*- coding: utf-8 -*-
+# http_target.py
+# Copyright (C) 2015 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+import logging
+import json
+from u1db import errors
+from u1db.remote import utils
+from twisted.internet import defer
+from leap.soledad.common.document import SoledadDocument
+from leap.soledad.client.events import SOLEDAD_SYNC_RECEIVE_STATUS
+from leap.soledad.client.events import emit
+from leap.soledad.client.crypto import is_symmetrically_encrypted
+from leap.soledad.client.encdecpool import SyncDecrypterPool
+from leap.soledad.client.http_target.support import RequestBody
+
+logger = logging.getLogger(__name__)
+
+
+class HTTPDocFetcher(object):
+
+ @defer.inlineCallbacks
+ def _receive_docs(self, last_known_generation, last_known_trans_id,
+ ensure_callback, sync_id, defer_decryption):
+
+ self._queue_for_decrypt = defer_decryption \
+ and self._sync_db is not None
+
+ new_generation = last_known_generation
+ new_transaction_id = last_known_trans_id
+
+ if self._queue_for_decrypt:
+ logger.debug(
+ "Soledad sync: will queue received docs for decrypting.")
+
+ if defer_decryption:
+ self._setup_sync_decr_pool()
+
+ # ---------------------------------------------------------------------
+ # maybe receive the first document
+ # ---------------------------------------------------------------------
+
+ # we fetch the first document before fetching the rest because we need
+ # to know the total number of documents to be received, and this
+ # information comes as metadata to each request.
+
+ doc = yield self._receive_one_doc(
+ last_known_generation, last_known_trans_id,
+ sync_id, 0)
+ self._received_docs = 0
+ number_of_changes, ngen, ntrans = self._insert_received_doc(doc, 1, 1)
+
+ if defer_decryption:
+ self._sync_decr_pool.start(number_of_changes)
+
+ # ---------------------------------------------------------------------
+ # maybe receive the rest of the documents
+ # ---------------------------------------------------------------------
+
+ # launch many asynchronous fetches and inserts of received documents
+ # in the temporary sync db. Will wait for all results before
+ # continuing.
+
+ received = 1
+ deferreds = []
+ while received < number_of_changes:
+ d = self._receive_one_doc(
+ last_known_generation,
+ last_known_trans_id, sync_id, received)
+ d.addCallback(
+ self._insert_received_doc,
+ received + 1, # the index of the current received doc
+ number_of_changes)
+ deferreds.append(d)
+ received += 1
+ results = yield defer.gatherResults(deferreds)
+
+ # get generation and transaction id of target after insertions
+ if deferreds:
+ _, new_generation, new_transaction_id = results.pop()
+
+ # ---------------------------------------------------------------------
+ # wait for async decryption to finish
+ # ---------------------------------------------------------------------
+
+ if defer_decryption:
+ yield self._sync_decr_pool.deferred
+ self._sync_decr_pool.stop()
+
+ defer.returnValue([new_generation, new_transaction_id])
+
+ def _receive_one_doc(self, last_known_generation,
+ last_known_trans_id, sync_id, received):
+ # add remote replica metadata to the request
+ body = RequestBody(
+ last_known_generation=last_known_generation,
+ last_known_trans_id=last_known_trans_id,
+ sync_id=sync_id,
+ ensure=self._ensure_callback is not None)
+ # inform server of how many documents have already been received
+ body.insert_info(received=received)
+ # send headers
+ return self._http_request(
+ self._url,
+ method='POST',
+ body=str(body),
+ content_type='application/x-soledad-sync-get')
+
+ def _insert_received_doc(self, response, idx, total):
+ """
+ Insert a received document into the local replica.
+
+ :param response: The body and headers of the response.
+ :type response: tuple(str, dict)
+ :param idx: The index count of the current operation.
+ :type idx: int
+ :param total: The total number of operations.
+ :type total: int
+ """
+ new_generation, new_transaction_id, number_of_changes, doc_id, \
+ rev, content, gen, trans_id = \
+ self._parse_received_doc_response(response)
+ if doc_id is not None:
+ # decrypt incoming document and insert into local database
+ # -------------------------------------------------------------
+ # symmetric decryption of document's contents
+ # -------------------------------------------------------------
+ # If arriving content was symmetrically encrypted, we decrypt it.
+ # We do it inline if defer_decryption flag is False or no sync_db
+ # was defined, otherwise we defer it writing it to the received
+ # docs table.
+ doc = SoledadDocument(doc_id, rev, content)
+ if is_symmetrically_encrypted(doc):
+ if self._queue_for_decrypt:
+ self._sync_decr_pool.insert_encrypted_received_doc(
+ doc.doc_id, doc.rev, doc.content, gen, trans_id,
+ idx)
+ else:
+ # defer_decryption is False or no-sync-db fallback
+ doc.set_json(self._crypto.decrypt_doc(doc))
+ self._insert_doc_cb(doc, gen, trans_id)
+ else:
+ # not symmetrically encrypted doc, insert it directly
+ # or save it in the decrypted stage.
+ if self._queue_for_decrypt:
+ self._sync_decr_pool.insert_received_doc(
+ doc.doc_id, doc.rev, doc.content, gen, trans_id,
+ idx)
+ else:
+ self._insert_doc_cb(doc, gen, trans_id)
+ # -------------------------------------------------------------
+ # end of symmetric decryption
+ # -------------------------------------------------------------
+ self._received_docs += 1
+ _emit_received(self._received_docs, total)
+ return number_of_changes, new_generation, new_transaction_id
+
+ def _parse_received_doc_response(self, response):
+ """
+ Parse the response from the server containing the received document.
+
+ :param response: The body and headers of the response.
+ :type response: tuple(str, dict)
+
+ :return: (new_gen, new_trans_id, number_of_changes, doc_id, rev,
+ content, gen, trans_id)
+ :rtype: tuple
+ """
+ # decode incoming stream
+ parts = response.splitlines()
+ if not parts or parts[0] != '[' or parts[-1] != ']':
+ raise errors.BrokenSyncStream
+ data = parts[1:-1]
+ # decode metadata
+ try:
+ line, comma = utils.check_and_strip_comma(data[0])
+ metadata = None
+ except (IndexError):
+ raise errors.BrokenSyncStream
+ try:
+ metadata = json.loads(line)
+ new_generation = metadata['new_generation']
+ new_transaction_id = metadata['new_transaction_id']
+ number_of_changes = metadata['number_of_changes']
+ except (ValueError, KeyError):
+ raise errors.BrokenSyncStream
+ # make sure we have replica_uid from fresh new dbs
+ if self._ensure_callback and 'replica_uid' in metadata:
+ self._ensure_callback(metadata['replica_uid'])
+ # parse incoming document info
+ doc_id = None
+ rev = None
+ content = None
+ gen = None
+ trans_id = None
+ if number_of_changes > 0:
+ try:
+ entry = json.loads(data[1])
+ doc_id = entry['id']
+ rev = entry['rev']
+ content = entry['content']
+ gen = entry['gen']
+ trans_id = entry['trans_id']
+ except (IndexError, KeyError):
+ raise errors.BrokenSyncStream
+ return new_generation, new_transaction_id, number_of_changes, \
+ doc_id, rev, content, gen, trans_id
+
+ def _setup_sync_decr_pool(self):
+ """
+ Set up the SyncDecrypterPool for deferred decryption.
+ """
+ if self._sync_decr_pool is None and self._sync_db is not None:
+ # initialize syncing queue decryption pool
+ self._sync_decr_pool = SyncDecrypterPool(
+ self._crypto,
+ self._sync_db,
+ insert_doc_cb=self._insert_doc_cb,
+ source_replica_uid=self.source_replica_uid)
+
+
+def _emit_received(received_docs, total):
+ msg = "%d/%d" % (received_docs, total)
+ emit(SOLEDAD_SYNC_RECEIVE_STATUS, msg)
+ logger.debug("Sync receive status: %s" % msg)
diff --git a/client/src/leap/soledad/client/http_target/send.py b/client/src/leap/soledad/client/http_target/send.py
new file mode 100644
index 00000000..de18df8b
--- /dev/null
+++ b/client/src/leap/soledad/client/http_target/send.py
@@ -0,0 +1,101 @@
+# -*- coding: utf-8 -*-
+# http_target.py
+# Copyright (C) 2015 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+import json
+import logging
+from twisted.internet import defer
+from leap.soledad.client.events import emit
+from leap.soledad.client.events import SOLEDAD_SYNC_SEND_STATUS
+from leap.soledad.client.http_target.support import RequestBody
+logger = logging.getLogger(__name__)
+
+
+class HTTPDocSender(object):
+
+ @defer.inlineCallbacks
+ def _send_docs(self, docs_by_generation, last_known_generation,
+ last_known_trans_id, sync_id):
+
+ if not docs_by_generation:
+ defer.returnValue([None, None])
+
+ # add remote replica metadata to the request
+ initial_body = RequestBody(
+ last_known_generation=last_known_generation,
+ last_known_trans_id=last_known_trans_id,
+ sync_id=sync_id,
+ ensure=self._ensure_callback is not None)
+ total = len(docs_by_generation)
+ entries = yield self._entries_from_docs(initial_body, docs_by_generation)
+ while len(entries):
+ result = yield self._http_request(
+ self._url,
+ method='POST',
+ body=entries.remove(1),
+ content_type='application/x-soledad-sync-put')
+ idx = total - len(entries)
+ if self._defer_encryption:
+ self._delete_sent(idx, docs_by_generation)
+ _emit_send(idx, total)
+ response_dict = json.loads(result)[0]
+ gen_after_send = response_dict['new_generation']
+ trans_id_after_send = response_dict['new_transaction_id']
+ defer.returnValue([gen_after_send, trans_id_after_send])
+
+ def _delete_sent(self, idx, docs_by_generation):
+ doc = docs_by_generation[idx][0]
+ self._sync_enc_pool.delete_encrypted_doc(
+ doc.doc_id, doc.rev)
+
+ @defer.inlineCallbacks
+ def _entries_from_docs(self, initial_body, docs_by_generation):
+ number_of_docs = len(docs_by_generation)
+ for idx, (doc, gen, trans_id) in enumerate(docs_by_generation, 1):
+ content = yield self._encrypt_doc(doc)
+ initial_body.insert_info(
+ id=doc.doc_id, rev=doc.rev, content=content, gen=gen,
+ trans_id=trans_id, number_of_docs=number_of_docs,
+ doc_idx=idx)
+ defer.returnValue(initial_body)
+
+ def _encrypt_doc(self, doc):
+ d = None
+ if doc.is_tombstone():
+ d = defer.succeed(None)
+ elif not self._defer_encryption:
+ # fallback case, for tests
+ d = defer.succeed(self._crypto.encrypt_doc(doc))
+ else:
+
+ def _maybe_encrypt_doc_inline(doc_json):
+ if doc_json is None:
+ # the document is not marked as tombstone, but we got
+ # nothing from the sync db. As it is not encrypted
+ # yet, we force inline encryption.
+ return self._crypto.encrypt_doc(doc)
+ return doc_json
+
+ d = self._sync_enc_pool.get_encrypted_doc(doc.doc_id, doc.rev)
+ d.addCallback(_maybe_encrypt_doc_inline)
+ return d
+
+
+def _emit_send(idx, total):
+ msg = "%d/%d" % (idx, total)
+ emit(
+ SOLEDAD_SYNC_SEND_STATUS,
+ "Soledad sync send status: %s" % msg)
+ logger.debug("Sync send status: %s" % msg)
diff --git a/client/src/leap/soledad/client/http_target/support.py b/client/src/leap/soledad/client/http_target/support.py
new file mode 100644
index 00000000..88934636
--- /dev/null
+++ b/client/src/leap/soledad/client/http_target/support.py
@@ -0,0 +1,154 @@
+# -*- coding: utf-8 -*-
+# http_target.py
+# Copyright (C) 2015 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+import warnings
+import json
+from u1db import errors
+from u1db.remote import http_errors
+from twisted.internet import defer
+from twisted.web.client import _ReadBodyProtocol
+from twisted.web.client import PartialDownloadError
+from twisted.web._newclient import ResponseDone
+from twisted.web._newclient import PotentialDataLoss
+
+
+# we want to make sure that HTTP errors will raise appropriate u1db errors,
+# that is, fire errbacks with the appropriate failures, in the context of
+# twisted. Because of that, we redefine the http body reader used by the HTTP
+# client below.
+
+class ReadBodyProtocol(_ReadBodyProtocol):
+
+ def __init__(self, response, deferred):
+ """
+ Initialize the protocol, additionally storing the response headers.
+ """
+ _ReadBodyProtocol.__init__(
+ self, response.code, response.phrase, deferred)
+ self.headers = response.headers
+
+ # ---8<--- snippet from u1db.remote.http_client, modified to use errbacks
+ def _error(self, respdic):
+ descr = respdic.get("error")
+ exc_cls = errors.wire_description_to_exc.get(descr)
+ if exc_cls is not None:
+ message = respdic.get("message")
+ self.deferred.errback(exc_cls(message))
+ # ---8<--- end of snippet from u1db.remote.http_client
+
+ def connectionLost(self, reason):
+ """
+ Deliver the accumulated response bytes to the waiting L{Deferred}, if
+ the response body has been completely received without error.
+ """
+ if reason.check(ResponseDone):
+
+ body = b''.join(self.dataBuffer)
+
+ # ---8<--- snippet from u1db.remote.http_client
+ if self.status in (200, 201):
+ self.deferred.callback(body)
+ elif self.status in http_errors.ERROR_STATUSES:
+ try:
+ respdic = json.loads(body)
+ except ValueError:
+ self.deferred.errback(
+ errors.HTTPError(self.status, body, self.headers))
+ else:
+ self._error(respdic)
+ # special cases
+ elif self.status == 503:
+ self.deferred.errback(errors.Unavailable(body, self.headers))
+ else:
+ self.deferred.errback(
+ errors.HTTPError(self.status, body, self.headers))
+ # ---8<--- end of snippet from u1db.remote.http_client
+
+ elif reason.check(PotentialDataLoss):
+ self.deferred.errback(
+ PartialDownloadError(self.status, self.message,
+ b''.join(self.dataBuffer)))
+ else:
+ self.deferred.errback(reason)
+
+
+def readBody(response):
+ """
+ Get the body of an L{IResponse} and return it as a byte string.
+
+ This is a helper function for clients that don't want to incrementally
+ receive the body of an HTTP response.
+
+ @param response: The HTTP response for which the body will be read.
+ @type response: L{IResponse} provider
+
+ @return: A L{Deferred} which will fire with the body of the response.
+ Cancelling it will close the connection to the server immediately.
+ """
+ def cancel(deferred):
+ """
+ Cancel a L{readBody} call, close the connection to the HTTP server
+ immediately, if it is still open.
+
+ @param deferred: The cancelled L{defer.Deferred}.
+ """
+ abort = getAbort()
+ if abort is not None:
+ abort()
+
+ d = defer.Deferred(cancel)
+ protocol = ReadBodyProtocol(response, d)
+
+ def getAbort():
+ return getattr(protocol.transport, 'abortConnection', None)
+
+ response.deliverBody(protocol)
+
+ if protocol.transport is not None and getAbort() is None:
+ warnings.warn(
+ 'Using readBody with a transport that does not have an '
+ 'abortConnection method',
+ category=DeprecationWarning,
+ stacklevel=2)
+
+ return d
+
+
+class RequestBody(object):
+
+ def __init__(self, **header_dict):
+ self.headers = header_dict
+ self.entries = []
+
+ def insert_info(self, **entry_dict):
+ entry = json.dumps(entry_dict)
+ self.entries.append(entry)
+ return len(entry)
+
+ def remove(self, number=1):
+ entries = [self.entries.pop(0) for i in xrange(number)]
+ return self.entries_to_str(entries)
+
+ def __str__(self):
+ return self.entries_to_str(self.entries)
+
+ def __len__(self):
+ return len(self.entries)
+
+ def entries_to_str(self, entries=None):
+ data = '[\r\n' + json.dumps(self.headers)
+ data += ''.join(',\r\n' + entry for entry in entries)
+ return data + '\r\n]'