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# Copyright 2014-2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import json
import urllib
from pprint import pformat
from typing import Optional
from twisted.internet import defer, reactor
from twisted.web.client import Agent, readBody
from twisted.web.http_headers import Headers
class HttpClient:
"""Interface for talking json over http"""
def put_json(self, url, data):
"""Sends the specifed json data using PUT
Args:
url (str): The URL to PUT data to.
data (dict): A dict containing the data that will be used as
the request body. This will be encoded as JSON.
Returns:
Deferred: Succeeds when we get a 2xx HTTP response. The result
will be the decoded JSON body.
"""
pass
def get_json(self, url, args=None):
"""Gets some json from the given host homeserver and path
Args:
url (str): The URL to GET data from.
args (dict): A dictionary used to create query strings, defaults to
None.
**Note**: The value of each key is assumed to be an iterable
and *not* a string.
Returns:
Deferred: Succeeds when we get a 2xx HTTP response. The result
will be the decoded JSON body.
"""
pass
class TwistedHttpClient(HttpClient):
"""Wrapper around the twisted HTTP client api.
Attributes:
agent (twisted.web.client.Agent): The twisted Agent used to send the
requests.
"""
def __init__(self):
self.agent = Agent(reactor)
@defer.inlineCallbacks
def put_json(self, url, data):
response = yield self._create_put_request(
url, data, headers_dict={"Content-Type": ["application/json"]}
)
body = yield readBody(response)
defer.returnValue((response.code, body))
@defer.inlineCallbacks
def get_json(self, url, args=None):
if args:
# generates a list of strings of form "k=v".
qs = urllib.urlencode(args, True)
url = "%s?%s" % (url, qs)
response = yield self._create_get_request(url)
body = yield readBody(response)
defer.returnValue(json.loads(body))
def _create_put_request(self, url, json_data, headers_dict: Optional[dict] = None):
"""Wrapper of _create_request to issue a PUT request"""
headers_dict = headers_dict or {}
if "Content-Type" not in headers_dict:
raise defer.error(RuntimeError("Must include Content-Type header for PUTs"))
return self._create_request(
"PUT", url, producer=_JsonProducer(json_data), headers_dict=headers_dict
)
def _create_get_request(self, url, headers_dict: Optional[dict] = None):
"""Wrapper of _create_request to issue a GET request"""
return self._create_request("GET", url, headers_dict=headers_dict or {})
@defer.inlineCallbacks
def do_request(
self,
method,
url,
data=None,
qparams=None,
jsonreq=True,
headers: Optional[dict] = None,
):
headers = headers or {}
if qparams:
url = "%s?%s" % (url, urllib.urlencode(qparams, True))
if jsonreq:
prod = _JsonProducer(data)
headers["Content-Type"] = ["application/json"]
else:
prod = _RawProducer(data)
if method in ["POST", "PUT"]:
response = yield self._create_request(
method, url, producer=prod, headers_dict=headers
)
else:
response = yield self._create_request(method, url)
body = yield readBody(response)
defer.returnValue(json.loads(body))
@defer.inlineCallbacks
def _create_request(
self, method, url, producer=None, headers_dict: Optional[dict] = None
):
"""Creates and sends a request to the given url"""
headers_dict = headers_dict or {}
headers_dict["User-Agent"] = ["Synapse Cmd Client"]
retries_left = 5
print("%s to %s with headers %s" % (method, url, headers_dict))
if self.verbose and producer:
if "password" in producer.data:
temp = producer.data["password"]
producer.data["password"] = "[REDACTED]"
print(json.dumps(producer.data, indent=4))
producer.data["password"] = temp
else:
print(json.dumps(producer.data, indent=4))
while True:
try:
response = yield self.agent.request(
method, url.encode("UTF8"), Headers(headers_dict), producer
)
break
except Exception as e:
print("uh oh: %s" % e)
if retries_left:
yield self.sleep(2 ** (5 - retries_left))
retries_left -= 1
else:
raise e
if self.verbose:
print("Status %s %s" % (response.code, response.phrase))
print(pformat(list(response.headers.getAllRawHeaders())))
defer.returnValue(response)
def sleep(self, seconds):
d = defer.Deferred()
reactor.callLater(seconds, d.callback, seconds)
return d
class _RawProducer:
def __init__(self, data):
self.data = data
self.body = data
self.length = len(self.body)
def startProducing(self, consumer):
consumer.write(self.body)
return defer.succeed(None)
def pauseProducing(self):
pass
def stopProducing(self):
pass
class _JsonProducer:
"""Used by the twisted http client to create the HTTP body from json"""
def __init__(self, jsn):
self.data = jsn
self.body = json.dumps(jsn).encode("utf8")
self.length = len(self.body)
def startProducing(self, consumer):
consumer.write(self.body)
return defer.succeed(None)
def pauseProducing(self):
pass
def stopProducing(self):
pass
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