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Commitfdeb437

Browse files
committed
Merge branch 'dups' into add-support-for-async-rest-streaming
2 parentsb5ddd62 +2014ef6 commitfdeb437

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2 files changed

+264
-0
lines changed

2 files changed

+264
-0
lines changed
Lines changed: 132 additions & 0 deletions
Original file line numberDiff line numberDiff line change
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# Copyright 2021 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Helpers for server-side streaming in REST."""
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17+
fromcollectionsimportdeque
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importstring
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fromtypingimportDeque,Union
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21+
importproto
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importrequests
23+
importgoogle.protobuf.message
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fromgoogle.protobuf.json_formatimportParse
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classResponseIterator:
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"""Iterator over REST API responses.
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Args:
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response (requests.Response): An API response object.
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response_message_cls (Union[proto.Message, google.protobuf.message.Message]): A response
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class expected to be returned from an API.
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Raises:
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ValueError: If `response_message_cls` is not a subclass of `proto.Message` or `google.protobuf.message.Message`.
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"""
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def__init__(
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self,
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response:requests.Response,
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response_message_cls:Union[proto.Message,google.protobuf.message.Message],
43+
):
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self._response=response
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self._response_message_cls=response_message_cls
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# Inner iterator over HTTP response's content.
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self._response_itr=self._response.iter_content(decode_unicode=True)
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# Contains a list of JSON responses ready to be sent to user.
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self._ready_objs:Deque[str]=deque()
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# Current JSON response being built.
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self._obj=""
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# Keeps track of the nesting level within a JSON object.
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self._level=0
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# Keeps track whether HTTP response is currently sending values
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# inside of a string value.
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self._in_string=False
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# Whether an escape symbol "\" was encountered.
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self._escape_next=False
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defcancel(self):
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"""Cancel existing streaming operation."""
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self._response.close()
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def_process_chunk(self,chunk:str):
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ifself._level==0:
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ifchunk[0]!="[":
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raiseValueError(
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"Can only parse array of JSON objects, instead got %s"%chunk
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)
70+
forcharinchunk:
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ifchar=="{":
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ifself._level==1:
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# Level 1 corresponds to the outermost JSON object
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# (i.e. the one we care about).
75+
self._obj=""
76+
ifnotself._in_string:
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self._level+=1
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self._obj+=char
79+
elifchar=="}":
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self._obj+=char
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ifnotself._in_string:
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self._level-=1
83+
ifnotself._in_stringandself._level==1:
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self._ready_objs.append(self._obj)
85+
elifchar=='"':
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# Helps to deal with an escaped quotes inside of a string.
87+
ifnotself._escape_next:
88+
self._in_string=notself._in_string
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self._obj+=char
90+
elifcharinstring.whitespace:
91+
ifself._in_string:
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self._obj+=char
93+
elifchar=="[":
94+
ifself._level==0:
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self._level+=1
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else:
97+
self._obj+=char
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elifchar=="]":
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ifself._level==1:
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self._level-=1
101+
else:
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self._obj+=char
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else:
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self._obj+=char
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self._escape_next=notself._escape_nextifchar=="\\"elseFalse
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107+
def__next__(self):
108+
whilenotself._ready_objs:
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try:
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chunk=next(self._response_itr)
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self._process_chunk(chunk)
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exceptStopIterationase:
113+
ifself._level>0:
114+
raiseValueError("Unfinished stream: %s"%self._obj)
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raisee
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returnself._grab()
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118+
def_grab(self):
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# Add extra quotes to make json.loads happy.
120+
ifissubclass(self._response_message_cls,proto.Message):
121+
returnself._response_message_cls.from_json(
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self._ready_objs.popleft(),ignore_unknown_fields=True
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)
124+
elifissubclass(self._response_message_cls,google.protobuf.message.Message):
125+
returnParse(self._ready_objs.popleft(),self._response_message_cls())
126+
else:
127+
raiseValueError(
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"Response message class must be a subclass of proto.Message or google.protobuf.message.Message."
129+
)
130+
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def__iter__(self):
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returnself
Lines changed: 132 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,132 @@
1+
# Copyright 2021 Google LLC
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#
3+
# Licensed under the Apache License, Version 2.0 (the "License");
4+
# you may not use this file except in compliance with the License.
5+
# You may obtain a copy of the License at
6+
#
7+
# http://www.apache.org/licenses/LICENSE-2.0
8+
#
9+
# Unless required by applicable law or agreed to in writing, software
10+
# distributed under the License is distributed on an "AS IS" BASIS,
11+
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12+
# See the License for the specific language governing permissions and
13+
# limitations under the License.
14+
15+
"""Helpers for server-side streaming in REST."""
16+
17+
fromcollectionsimportdeque
18+
importstring
19+
fromtypingimportDeque,Union
20+
21+
importproto
22+
importrequests
23+
importgoogle.protobuf.message
24+
fromgoogle.protobuf.json_formatimportParse
25+
26+
27+
classResponseIterator:
28+
"""Iterator over REST API responses.
29+
30+
Args:
31+
response (requests.Response): An API response object.
32+
response_message_cls (Union[proto.Message, google.protobuf.message.Message]): A response
33+
class expected to be returned from an API.
34+
35+
Raises:
36+
ValueError: If `response_message_cls` is not a subclass of `proto.Message` or `google.protobuf.message.Message`.
37+
"""
38+
39+
def__init__(
40+
self,
41+
response:requests.Response,
42+
response_message_cls:Union[proto.Message,google.protobuf.message.Message],
43+
):
44+
self._response=response
45+
self._response_message_cls=response_message_cls
46+
# Inner iterator over HTTP response's content.
47+
self._response_itr=self._response.iter_content(decode_unicode=True)
48+
# Contains a list of JSON responses ready to be sent to user.
49+
self._ready_objs:Deque[str]=deque()
50+
# Current JSON response being built.
51+
self._obj=""
52+
# Keeps track of the nesting level within a JSON object.
53+
self._level=0
54+
# Keeps track whether HTTP response is currently sending values
55+
# inside of a string value.
56+
self._in_string=False
57+
# Whether an escape symbol "\" was encountered.
58+
self._escape_next=False
59+
60+
defcancel(self):
61+
"""Cancel existing streaming operation."""
62+
self._response.close()
63+
64+
def_process_chunk(self,chunk:str):
65+
ifself._level==0:
66+
ifchunk[0]!="[":
67+
raiseValueError(
68+
"Can only parse array of JSON objects, instead got %s"%chunk
69+
)
70+
forcharinchunk:
71+
ifchar=="{":
72+
ifself._level==1:
73+
# Level 1 corresponds to the outermost JSON object
74+
# (i.e. the one we care about).
75+
self._obj=""
76+
ifnotself._in_string:
77+
self._level+=1
78+
self._obj+=char
79+
elifchar=="}":
80+
self._obj+=char
81+
ifnotself._in_string:
82+
self._level-=1
83+
ifnotself._in_stringandself._level==1:
84+
self._ready_objs.append(self._obj)
85+
elifchar=='"':
86+
# Helps to deal with an escaped quotes inside of a string.
87+
ifnotself._escape_next:
88+
self._in_string=notself._in_string
89+
self._obj+=char
90+
elifcharinstring.whitespace:
91+
ifself._in_string:
92+
self._obj+=char
93+
elifchar=="[":
94+
ifself._level==0:
95+
self._level+=1
96+
else:
97+
self._obj+=char
98+
elifchar=="]":
99+
ifself._level==1:
100+
self._level-=1
101+
else:
102+
self._obj+=char
103+
else:
104+
self._obj+=char
105+
self._escape_next=notself._escape_nextifchar=="\\"elseFalse
106+
107+
def__next__(self):
108+
whilenotself._ready_objs:
109+
try:
110+
chunk=next(self._response_itr)
111+
self._process_chunk(chunk)
112+
exceptStopIterationase:
113+
ifself._level>0:
114+
raiseValueError("Unfinished stream: %s"%self._obj)
115+
raisee
116+
returnself._grab()
117+
118+
def_grab(self):
119+
# Add extra quotes to make json.loads happy.
120+
ifissubclass(self._response_message_cls,proto.Message):
121+
returnself._response_message_cls.from_json(
122+
self._ready_objs.popleft(),ignore_unknown_fields=True
123+
)
124+
elifissubclass(self._response_message_cls,google.protobuf.message.Message):
125+
returnParse(self._ready_objs.popleft(),self._response_message_cls())
126+
else:
127+
raiseValueError(
128+
"Response message class must be a subclass of proto.Message or google.protobuf.message.Message."
129+
)
130+
131+
def__iter__(self):
132+
returnself

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