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"""
Tests for the various utility functions provided by hyper-h2.
"""
from __future__ import annotations
import pytest
import h2.config
import h2.connection
import h2.errors
import h2.events
import h2.exceptions
from h2.utilities import SizeLimitDict, extract_method_header
class TestGetNextAvailableStreamID:
"""
Tests for the ``H2Connection.get_next_available_stream_id`` method.
"""
example_request_headers = [
(":authority", "example.com"),
(":path", "/"),
(":scheme", "https"),
(":method", "GET"),
]
example_response_headers = [
(":status", "200"),
("server", "fake-serv/0.1.0"),
]
server_config = h2.config.H2Configuration(client_side=False)
def test_returns_correct_sequence_for_clients(self, frame_factory) -> None:
"""
For a client connection, the correct sequence of stream IDs is
returned.
"""
# Running the exhaustive version of this test (all 1 billion available
# stream IDs) is too painful. For that reason, we validate that the
# original sequence is right for the first few thousand, and then just
# check that it terminates properly.
#
# Make sure that the streams get cleaned up: 8k streams floating
# around would make this test memory-hard, and it's not supposed to be
# a test of how much RAM your machine has.
c = h2.connection.H2Connection()
c.initiate_connection()
initial_sequence = range(1, 2**13, 2)
for expected_stream_id in initial_sequence:
stream_id = c.get_next_available_stream_id()
assert stream_id == expected_stream_id
c.send_headers(
stream_id=stream_id,
headers=self.example_request_headers,
end_stream=True,
)
f = frame_factory.build_headers_frame(
headers=self.example_response_headers,
stream_id=stream_id,
flags=["END_STREAM"],
)
c.receive_data(f.serialize())
c.clear_outbound_data_buffer()
# Jump up to the last available stream ID. Don't clean up the stream
# here because who cares about one stream.
last_client_id = 2**31 - 1
c.send_headers(
stream_id=last_client_id,
headers=self.example_request_headers,
end_stream=True,
)
with pytest.raises(h2.exceptions.NoAvailableStreamIDError):
c.get_next_available_stream_id()
def test_returns_correct_sequence_for_servers(self, frame_factory) -> None:
"""
For a server connection, the correct sequence of stream IDs is
returned.
"""
# Running the exhaustive version of this test (all 1 billion available
# stream IDs) is too painful. For that reason, we validate that the
# original sequence is right for the first few thousand, and then just
# check that it terminates properly.
#
# Make sure that the streams get cleaned up: 8k streams floating
# around would make this test memory-hard, and it's not supposed to be
# a test of how much RAM your machine has.
c = h2.connection.H2Connection(config=self.server_config)
c.initiate_connection()
c.receive_data(frame_factory.preamble())
f = frame_factory.build_headers_frame(
headers=self.example_request_headers,
)
c.receive_data(f.serialize())
initial_sequence = range(2, 2**13, 2)
for expected_stream_id in initial_sequence:
stream_id = c.get_next_available_stream_id()
assert stream_id == expected_stream_id
c.push_stream(
stream_id=1,
promised_stream_id=stream_id,
request_headers=self.example_request_headers,
)
c.send_headers(
stream_id=stream_id,
headers=self.example_response_headers,
end_stream=True,
)
c.clear_outbound_data_buffer()
# Jump up to the last available stream ID. Don't clean up the stream
# here because who cares about one stream.
last_server_id = 2**31 - 2
c.push_stream(
stream_id=1,
promised_stream_id=last_server_id,
request_headers=self.example_request_headers,
)
with pytest.raises(h2.exceptions.NoAvailableStreamIDError):
c.get_next_available_stream_id()
def test_does_not_increment_without_stream_send(self) -> None:
"""
If a new stream isn't actually created, the next stream ID doesn't
change.
"""
c = h2.connection.H2Connection()
c.initiate_connection()
first_stream_id = c.get_next_available_stream_id()
second_stream_id = c.get_next_available_stream_id()
assert first_stream_id == second_stream_id
c.send_headers(
stream_id=first_stream_id,
headers=self.example_request_headers,
)
third_stream_id = c.get_next_available_stream_id()
assert third_stream_id == (first_stream_id + 2)
class TestExtractHeader:
example_headers_with_bytes = [
(b":authority", b"example.com"),
(b":path", b"/"),
(b":scheme", b"https"),
(b":method", b"GET"),
]
def test_extract_header_method(self) -> None:
assert extract_method_header(
self.example_headers_with_bytes,
) == b"GET"
def test_size_limit_dict_limit() -> None:
dct = SizeLimitDict(size_limit=2)
dct[1] = 1
dct[2] = 2
assert len(dct) == 2
assert dct[1] == 1
assert dct[2] == 2
dct[3] = 3
assert len(dct) == 2
assert dct[2] == 2
assert dct[3] == 3
assert 1 not in dct
def test_size_limit_dict_limit_init() -> None:
initial_dct = {
1: 1,
2: 2,
3: 3,
}
dct = SizeLimitDict(initial_dct, size_limit=2)
assert len(dct) == 2
def test_size_limit_dict_no_limit() -> None:
dct = SizeLimitDict(size_limit=None)
dct[1] = 1
dct[2] = 2
assert len(dct) == 2
assert dct[1] == 1
assert dct[2] == 2
dct[3] = 3
assert len(dct) == 3
assert dct[1] == 1
assert dct[2] == 2
assert dct[3] == 3
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