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require 'helper'
RSpec.describe HTTP2::Stream do
include FrameHelpers
before(:each) do
@client = Client.new
@stream = @client.new_stream
end
context 'stream states' do
it 'should initiliaze all streams to IDLE' do
expect(@stream.state).to eq :idle
end
it 'should set custom stream priority' do
stream = @client.new_stream(weight: 3, dependency: 2, exclusive: true)
expect(stream.weight).to eq 3
end
context 'idle' do
it 'should transition to open on sent HEADERS' do
@stream.send headers_frame
expect(@stream.state).to eq :open
end
it 'should transition to open on received HEADERS' do
@stream.receive headers_frame
expect(@stream.state).to eq :open
end
it 'should transition to reserved (local) on sent PUSH_PROMISE' do
@stream.send push_promise_frame
expect(@stream.state).to eq :reserved_local
end
it 'should transition to reserved (remote) on received PUSH_PROMISE' do
@stream.receive push_promise_frame
expect(@stream.state).to eq :reserved_remote
end
it 'should reprioritize stream on sent PRIORITY' do
expect { @stream.send priority_frame }.to_not raise_error
expect(@stream.weight).to eq 20
end
it 'should reprioritize stream on received PRIORITY' do
expect { @stream.send priority_frame }.to_not raise_error
expect(@stream.weight).to eq 20
end
end
context 'reserved (local)' do
before(:each) { @stream.send push_promise_frame }
it 'should transition on sent PUSH_PROMISE' do
expect(@stream.state).to eq :reserved_local
end
it 'should allow HEADERS to be sent' do
expect { @stream.send headers_frame }.to_not raise_error
end
it 'should raise error if sending invalid frames' do
frame_types.reject { |frame| %i[headers rst_stream].include?(frame[:type]) }.each do |type|
expect { @stream.dup.send type }.to raise_error InternalError
end
end
it 'should raise error on receipt of invalid frames' do
what_types = frame_types.reject { |frame| %i[priority window_update rst_stream].include?(frame[:type]) }
what_types.each do |type|
expect { @stream.dup.receive type }.to raise_error InternalError
end
end
it 'should transition to half closed (remote) on sent HEADERS' do
@stream.send headers_frame
expect(@stream.state).to eq :half_closed_remote
end
it 'should transition to closed on sent RST_STREAM' do
@stream.close
expect(@stream.state).to eq :closed
end
it 'should transition to closed on received RST_STREAM' do
@stream.receive rst_stream_frame
expect(@stream.state).to eq :closed
end
it 'should reprioritize stream on PRIORITY' do
expect { @stream.receive priority_frame }.to_not raise_error
expect(@stream.weight).to eq 20
end
it 'should increment remote_window on received WINDOW_UPDATE' do
expect { @stream.receive window_update_frame }.to_not raise_error
expect(@stream.remote_window).to eq DEFAULT_FLOW_WINDOW + window_update_frame[:increment]
end
end
context 'reserved (remote)' do
before(:each) { @stream.receive push_promise_frame }
it 'should transition on received PUSH_PROMISE' do
expect(@stream.state).to eq :reserved_remote
end
it 'should raise error if sending invalid frames' do
frame_types.reject { |frame| %i[priority rst_stream window_update].include?(frame[:type]) }.each do |type|
expect { @stream.dup.send type }.to raise_error InternalError
end
end
it 'should raise error on receipt of invalid frames' do
frame_types.reject { |frame| %i[headers rst_stream].include?(frame[:type]) }.each do |type|
expect { @stream.dup.receive type }.to raise_error InternalError
end
end
it 'should transition to half closed (local) on received HEADERS' do
@stream.receive headers_frame
expect(@stream.state).to eq :half_closed_local
end
it 'should transition to closed on sent RST_STREAM' do
@stream.close
expect(@stream.state).to eq :closed
end
it 'should transition to closed on received RST_STREAM' do
@stream.receive rst_stream_frame
expect(@stream.state).to eq :closed
end
it 'should reprioritize stream on PRIORITY' do
expect { @stream.send priority_frame }.to_not raise_error
expect(@stream.weight).to eq 20
end
it 'should increment local_window on sent WINDOW_UPDATE' do
expect { @stream.send window_update_frame }.to_not raise_error
expect(@stream.local_window).to eq DEFAULT_FLOW_WINDOW + window_update_frame[:increment]
end
end
context 'open' do
before(:each) { @stream.receive headers_frame }
it 'should allow any valid frames types to be sent' do
(frame_types - [ping_frame, goaway_frame, settings_frame]).each do |type|
expect { @stream.dup.send type.deep_dup }.to_not raise_error
end
end
it 'should allow frames of any type to be received' do
frame_types.each do |type|
expect { @stream.dup.receive type }.to_not raise_error
end
end
it 'should transition to half closed (local) if sending END_STREAM' do
[data_frame, headers_frame].each do |frame|
s, f = @stream.dup, frame.deep_dup
f[:flags] = [:end_stream]
s.send f
expect(s.state).to eq :half_closed_local
end
end
it 'should transition to half closed (remote) if receiving END_STREAM' do
[data_frame, headers_frame].each do |frame|
s, f = @stream.dup, frame.dup
f[:flags] = [:end_stream]
s.receive f
expect(s.state).to eq :half_closed_remote
end
end
it 'should transition to half closed if remote opened with END_STREAM' do
s = @client.new_stream
hclose = headers_frame
hclose[:flags] = [:end_stream]
s.receive hclose
expect(s.state).to eq :half_closed_remote
end
it 'should transition to half closed if local opened with END_STREAM' do
s = @client.new_stream
hclose = headers_frame
hclose[:flags] = [:end_stream]
s.send hclose
expect(s.state).to eq :half_closed_local
end
it 'should transition to closed if sending RST_STREAM' do
@stream.close
expect(@stream.state).to eq :closed
expect(@stream).to be_closed
end
it 'should transition to closed if receiving RST_STREAM' do
@stream.receive rst_stream_frame
expect(@stream.state).to eq :closed
end
it 'should emit :active on open transition' do
openp, openr = false, false
sp = @client.new_stream
sr = @client.new_stream
sp.on(:active) { openp = true }
sr.on(:active) { openr = true }
sp.receive headers_frame
sr.send headers_frame
expect(openp).to be_truthy
expect(openr).to be_truthy
end
it 'should not emit :active on transition from open' do
order, stream = [], @client.new_stream
stream.on(:active) { order << :active }
stream.on(:half_close) { order << :half_close }
stream.on(:close) { order << :close }
req = headers_frame
req[:flags] = [:end_headers]
stream.send req
stream.send data_frame
expect(order).to eq [:active, :half_close]
end
it 'should emit :close on close transition' do
closep, closer = false, false
sp, sr = @stream.dup, @stream.dup
sp.on(:close) { closep = true }
sr.on(:close) { closer = true }
sp.receive rst_stream_frame
sr.close
expect(closep).to be_truthy
expect(closer).to be_truthy
end
it 'should emit :close after frame is processed' do
order, stream = [], @client.new_stream
stream.on(:active) { order << :active }
stream.on(:data) { order << :data }
stream.on(:half_close) { order << :half_close }
stream.on(:close) { order << :close }
req = headers_frame
req[:flags] = [:end_stream, :end_headers]
stream.send req
stream.receive headers_frame
stream.receive data_frame
expect(order).to eq [:active, :half_close, :data, :close]
end
it 'should emit :close with reason' do
reason = nil
@stream.on(:close) { |r| reason = r }
@stream.receive rst_stream_frame
expect(reason).not_to be_nil
end
it 'should reprioritize stream on sent PRIORITY' do
expect { @stream.send priority_frame }.to_not raise_error
expect(@stream.weight).to eq 20
end
it 'should reprioritize stream on received PRIORITY' do
expect { @stream.receive priority_frame }.to_not raise_error
expect(@stream.weight).to eq 20
end
end
context 'half closed (local)' do
before(:each) { @stream.send headers_frame.merge(flags: [:end_headers, :end_stream]) }
it 'should raise error on attempt to send invalid frames' do
frame_types.reject { |frame| %i[priority rst_stream window_update].include?(frame[:type]) }.each do |frame|
expect { @stream.dup.send frame }.to raise_error InternalError
end
end
it 'should transition to closed on receipt of END_STREAM flag' do
[data_frame, headers_frame, continuation_frame].each do |frame|
s, f = @stream.dup, frame.dup
f[:flags] = [:end_stream]
s.receive f
expect(s.state).to eq :closed
end
end
it 'should transition to closed on receipt of RST_STREAM frame' do
@stream.receive rst_stream_frame
expect(@stream.state).to eq :closed
end
it 'should transition to closed if RST_STREAM frame is sent' do
@stream.send rst_stream_frame
expect(@stream.state).to eq :closed
end
it 'should ignore received WINDOW_UPDATE frames' do
expect { @stream.receive window_update_frame }.to_not raise_error
expect(@stream.state).to eq :half_closed_local
end
it 'should ignore received PRIORITY frames' do
expect { @stream.receive priority_frame }.to_not raise_error
expect(@stream.state).to eq :half_closed_local
end
it 'should reprioritize stream on sent PRIORITY' do
expect { @stream.send priority_frame }.to_not raise_error
expect(@stream.weight).to eq 20
end
it 'should reprioritize stream (and decendants) on received PRIORITY' do
expect { @stream.receive priority_frame }.to_not raise_error
expect(@stream.weight).to eq 20
end
it 'should increment local_window on sent WINDOW_UPDATE' do
expect { @stream.send window_update_frame }.to_not raise_error
expect(@stream.local_window).to eq DEFAULT_FLOW_WINDOW + window_update_frame[:increment]
end
it 'should emit :half_close event on transition' do
order = []
stream = @client.new_stream
stream.on(:active) { order << :active }
stream.on(:half_close) { order << :half_close }
req = headers_frame
req[:flags] = [:end_stream, :end_headers]
stream.send req
expect(order).to eq [:active, :half_close]
end
it 'should emit :close event on transition to closed' do
closed = false
@stream.on(:close) { closed = true }
@stream.receive rst_stream_frame
expect(@stream.state).to eq :closed
expect(closed).to be_truthy
end
end
context 'half closed (remote)' do
before(:each) { @stream.receive headers_frame.merge(flags: [:end_headers, :end_stream]) }
it 'should raise STREAM_CLOSED error on reciept of frames' do
(frame_types - [priority_frame, rst_stream_frame, window_update_frame]).each do |frame|
expect do
@stream.dup.receive frame
end.to raise_error(StreamClosed)
end
end
it 'should transition to closed if END_STREAM flag is sent' do
[data_frame, headers_frame].each do |frame|
s, f = @stream.dup, frame.deep_dup
f[:flags] = [:end_stream]
s.on(:close) { expect(s.state).to eq :closed }
s.send f
expect(s.state).to eq :closed
end
end
it 'should not transition to closed if END_STREAM flag is sent when overflowing window' do
@stream.on(:close) { fail 'should not have closed' }
data = { type: :data, flags: [], stream: @stream.id }
4.times do
data = data.merge(flags: [:end_stream]) if @stream.remote_window < 16_384
@stream.send data.merge(payload: 'x' * 16_384)
end
end
it 'should transition to closed when send buffer is emptied' do
o = Object.new
expect(o).to receive(:tap).once
@stream.on(:close) do
expect(@stream.buffered_amount).to eq 0
o.tap
end
data = { type: :data, flags: [], stream: @stream.id }
4.times do
data = data.merge(flags: [:end_stream]) if @stream.remote_window < 16_384
@stream.send data.merge(payload: 'x' * 16_384)
end
@client << Framer.new.generate(type: :window_update, stream: @stream.id, increment: 16_384)
end
it 'should transition to closed if RST_STREAM is sent' do
@stream.close
expect(@stream.state).to eq :closed
end
it 'should transition to closed on reciept of RST_STREAM frame' do
@stream.receive rst_stream_frame
expect(@stream.state).to eq :closed
end
it 'should ignore sent WINDOW_UPDATE frames' do
expect { @stream.send window_update_frame }.to_not raise_error
expect(@stream.state).to eq :half_closed_remote
end
it 'should increment remote_window on received WINDOW_UPDATE' do
expect { @stream.receive window_update_frame }.to_not raise_error
expect(@stream.remote_window).to eq DEFAULT_FLOW_WINDOW + window_update_frame[:increment]
end
it 'should reprioritize stream on sent PRIORITY' do
expect { @stream.send priority_frame }.to_not raise_error
expect(@stream.weight).to eq 20
end
it 'should reprioritize stream on received PRIORITY' do
expect { @stream.receive priority_frame }.to_not raise_error
expect(@stream.weight).to eq 20
end
it 'should emit :half_close event on transition' do
order = []
stream = @client.new_stream
stream.on(:active) { order << :active }
stream.on(:half_close) { order << :half_close }
req = headers_frame
req[:flags] = [:end_stream, :end_headers]
stream.receive req
expect(order).to eq [:active, :half_close]
end
it 'should emit :close event on close transition' do
closed = false
@stream.on(:close) { closed = true }
@stream.close
expect(@stream.state).to eq :closed
expect(closed).to be_truthy
end
end
context 'closed' do
context 'remote closed stream' do
before(:each) do
@stream.send headers_frame.merge(flags: [:end_headers, :end_stream]) # half closed local
@stream.receive headers_frame.merge(flags: [:end_headers, :end_stream]) # closed by remote
end
it 'should raise STREAM_CLOSED on attempt to send frames' do
(frame_types - [priority_frame, rst_stream_frame]).each do |frame|
expect do
@stream.dup.send frame
end.to raise_error(StreamClosed)
end
end
it 'should raise STREAM_CLOSED on receipt of frame' do
(frame_types - [priority_frame, rst_stream_frame, window_update_frame]).each do |frame|
expect do
@stream.dup.receive frame
end.to raise_error(StreamClosed)
end
end
it 'should allow PRIORITY, RST_STREAM to be sent' do
expect { @stream.send priority_frame }.to_not raise_error
expect { @stream.send rst_stream_frame }.to_not raise_error
end
it 'should allow PRIORITY, RST_STREAM to be received' do
expect { @stream.receive priority_frame }.to_not raise_error
expect { @stream.receive rst_stream_frame }.to_not raise_error
end
it 'should reprioritize stream on sent PRIORITY' do
expect { @stream.send priority_frame }.to_not raise_error
expect(@stream.weight).to eq 20
end
it 'should reprioritize stream on received PRIORITY' do
expect { @stream.receive priority_frame }.to_not raise_error
expect(@stream.weight).to eq 20
end
it 'should ignore received WINDOW_UPDATE frames' do
expect { @stream.receive window_update_frame }.to_not raise_error
expect(@stream.state).to eq :closed
end
end
context 'local closed via RST_STREAM frame' do
before(:each) do
@stream.send headers_frame # open
@stream.send rst_stream_frame # closed by local
end
it 'should ignore received frames' do
(frame_types - [push_promise_frame]).each do |frame|
expect do
cb = []
@stream.on(:data) { cb << :data }
@stream.on(:headers) { cb << :headers }
@stream.dup.receive frame.dup
expect(cb).to be_empty
end.to_not raise_error
end
end
# it "should transition to reserved remote on PUSH_PROMISE" do
# An endpoint might receive a PUSH_PROMISE frame after it sends
# RST_STREAM. PUSH_PROMISE causes a stream to become "reserved".
# ...
# We're auto RST'ing PUSH streams in connection class, hence
# skipping this transition for now.
# end
end
# FIXME: Isn't this test same as "half closed (local)"?
# context "local closed via END_STREAM flag" do
# before(:each) do
# @stream.send headers_frame # open
# @stream.send data_frame # contains end_stream flag
# end
# it "should ignore received frames" do
# frame_types.each do |frame|
# expect { @stream.dup.receive frame }.to_not raise_error
# end
# end
# end
end
end # end stream states
# TODO: add test cases to ensure on(:priority) emitted after close
context 'flow control' do
it 'should initialize to default flow control window' do
expect(@stream.remote_window).to eq DEFAULT_FLOW_WINDOW
end
it 'should update window size on DATA frames only' do
@stream.send headers_frame # go to open
expect(@stream.remote_window).to eq DEFAULT_FLOW_WINDOW
(frame_types - [data_frame, ping_frame, goaway_frame, settings_frame]).each do |frame|
s = @stream.dup
s.send frame.deep_dup
expect(s.remote_window).to eq DEFAULT_FLOW_WINDOW
end
@stream.send data_frame
expect(@stream.remote_window).to eq DEFAULT_FLOW_WINDOW - data_frame[:payload].bytesize
end
it 'should update window size on receipt of WINDOW_UPDATE' do
@stream.send headers_frame
@stream.send data_frame
@stream.receive window_update_frame
expect(@stream.remote_window).to eq(
DEFAULT_FLOW_WINDOW - data_frame[:payload].bytesize + window_update_frame[:increment],
)
end
it 'should observe session flow control' do
settings, data = settings_frame, data_frame
settings[:payload] = [[:settings_initial_window_size, 1000]]
settings[:stream] = 0
framer = Framer.new
@client << framer.generate(settings)
s1 = @client.new_stream
s1.send headers_frame
s1.send data.merge(payload: 'x' * 900, flags: [])
expect(s1.remote_window).to eq 100
s1.send data.merge(payload: 'x' * 200)
expect(s1.remote_window).to eq 0
expect(s1.buffered_amount).to eq 100
@client << framer.generate(window_update_frame.merge(stream: s1.id, increment: 1000))
expect(s1.buffered_amount).to eq 0
expect(s1.remote_window).to eq 900
end
it 'should not update window when data received is less than half of maximum local window size' do
data = data_frame
datalen = data[:payload].bytesize
expect(@stream).not_to receive(:send) do |frame|
expect(frame[:type]).to eq :window_update
expect(frame[:increment]).to eq datalen
end
@stream.receive headers_frame
@stream.receive data
end
it 'should update window when data received is over half of the maximum local window size' do
data1 = data_frame.merge(payload: 'a'*16_384, flags: [])
data2 = data_frame.merge(payload: 'a'*16_384)
datalen = 16_384 * 2
expect(@stream).to receive(:send) do |frame|
expect(frame[:type]).to eq :window_update
expect(frame[:increment]).to eq datalen
end
@stream.receive headers_frame
@stream.receive data1
@stream.receive data2
end
end
context 'client API' do
it '.reprioritize should emit PRIORITY frame' do
expect(@stream).to receive(:send) do |frame|
expect(frame[:type]).to eq :priority
expect(frame[:weight]).to eq 30
end
@stream.reprioritize weight: 30
end
it '.reprioritize should raise error if invoked by server' do
srv = Server.new
stream = srv.new_stream
expect { stream.reprioritize(weight: 10) }.to raise_error(InternalError)
end
it '.headers should emit HEADERS frames' do
payload = {
':method' => 'GET',
':scheme' => 'http',
':host' => 'www.example.org',
':path' => '/resource',
'custom' => 'value',
}
expect(@stream).to receive(:send) do |frame|
expect(frame[:type]).to eq :headers
expect(frame[:payload]).to eq payload
expect(frame[:flags]).to eq [:end_headers]
end
@stream.headers(payload, end_stream: false, end_headers: true)
end
it '.data should emit DATA frames' do
expect(@stream).to receive(:send) do |frame|
expect(frame[:type]).to eq :data
expect(frame[:payload]).to eq 'text'
expect(frame[:flags]).to be_empty
end
@stream.data('text', end_stream: false)
expect(@stream).to receive(:send) do |frame|
expect(frame[:flags]).to eq [:end_stream]
end
@stream.data('text')
end
it '.data should split large DATA frames' do
data = 'x' * 16_384 * 2
want = [
{ type: :data, flags: [], length: 16_384 },
{ type: :data, flags: [], length: 16_384 },
{ type: :data, flags: [:end_stream], length: 1 },
]
want.each do |w|
expect(@stream).to receive(:send) do |frame|
expect(frame[:type]).to eq w[:type]
expect(frame[:flags]).to eq w[:flags]
expect(frame[:payload].bytesize).to eq w[:length]
end
end
@stream.data(data + 'x')
end
it '.data should split large multibyte DATA frames' do
data = '🐼' * 16_384
want = [
{ type: :data, flags: [], length: 16_384 },
{ type: :data, flags: [], length: 16_384 },
{ type: :data, flags: [], length: 16_384 },
{ type: :data, flags: [], length: 16_384 },
{ type: :data, flags: [:end_stream], length: 1 },
]
want.each do |w|
expect(@stream).to receive(:send) do |frame|
expect(frame[:type]).to eq w[:type]
expect(frame[:flags]).to eq w[:flags]
expect(frame[:payload].bytesize).to eq w[:length]
end
end
@stream.data(data + 'x')
end
it '.cancel should reset stream with cancel error code' do
expect(@stream).to receive(:send) do |frame|
expect(frame[:type]).to eq :rst_stream
expect(frame[:error]).to eq :cancel
end
@stream.cancel
end
it '.refuse should reset stream with refused stream error code' do
expect(@stream).to receive(:send) do |frame|
expect(frame[:type]).to eq :rst_stream
expect(frame[:error]).to eq :refused_stream
end
@stream.refuse
end
it '.window_update should emit WINDOW_UPDATE frames' do
expect(@stream).to receive(:send) do |frame|
expect(frame[:type]).to eq :window_update
expect(frame[:increment]).to eq 20
end
@stream.window_update(20)
end
end
context 'server API' do
before(:each) do
@srv = Server.new
@frm = Framer.new
@client.on(:frame) { |bytes| @srv << bytes }
@client_stream = @client.new_stream
end
it 'should emit received headers via on(:headers)' do
headers, recv = REQUEST_HEADERS, nil
@srv.on(:stream) do |stream|
stream.on(:headers) { |h| recv = h }
end
@client_stream.headers(headers)
expect(recv).to eq headers
end
it 'should emit received payload via on(:data)' do
payload = 'some-payload'
@srv.on(:stream) do |stream|
stream.on(:data) do |recv|
expect(recv).to eq payload
end
end
@client_stream.headers(REQUEST_HEADERS)
@client_stream.data(payload)
end
it 'should emit received priority parameters via on(:priority)' do
new_weight, new_dependency = 15, @client_stream.id + 2
callback_called = false
@srv.on(:stream) do |stream|
stream.on(:priority) do |pri|
callback_called = true
expect(pri.is_a?(Hash)).to be
expect(pri[:weight]).to eq new_weight
expect(pri[:dependency]).to eq new_dependency
end
end
@client_stream.headers(REQUEST_HEADERS)
@client_stream.reprioritize(weight: new_weight, dependency: new_dependency)
expect(callback_called).to be
end
context 'push' do
before(:each) do
@srv.on(:frame) { |bytes| @client << bytes }
@srv.on(:stream) do |stream|
@server_stream = stream
end
@client_stream.headers(REQUEST_HEADERS)
end
it '.promise should emit server initiated stream' do
push = nil
@server_stream.promise(REQUEST_HEADERS) { |pstream| push = pstream }
expect(push.id).to eq 2
end
it '.promise push stream should have parent stream' do
push = nil
@server_stream.promise(REQUEST_HEADERS) { |pstream| push = pstream }
expect(push.state).to eq :reserved_local
expect(push.parent.id).to eq @server_stream.id
end
context 'stream states' do
it 'server: active > half close > close' do
order = []
@server_stream.promise(REQUEST_HEADERS) do |push|
stream = push
expect(push.state).to eq :reserved_local
order << :reserved
push.on(:active) { order << :active }
push.on(:half_close) { order << :half_close }
push.on(:close) { order << :close }
push.headers(RESPONSE_HEADERS)
push.send data_frame.merge(stream: stream.id)
end
expect(order).to eq [:reserved, :active, :half_close, :close]
end
it 'client: promise_headers > active > headers > .. > data > close' do
order, headers, promise_headers = [], [], []
@client.on(:promise) do |push|
order << :reserved
push.on(:active) { order << :active }
push.on(:data) { order << :data }
push.on(:half_close) { order << :half_close }
push.on(:close) { order << :close }
push.on(:promise_headers) do |h|
order << :promise_headers
promise_headers += h
end
push.on(:headers) do |h|
order << :headers
headers += h
end
expect(push.id).to be_even
end
@server_stream.promise(REQUEST_HEADERS) do |push|
push.headers(RESPONSE_HEADERS)
push.data('somedata')
end
expect(promise_headers).to eq(REQUEST_HEADERS)
expect(headers).to eq(RESPONSE_HEADERS)
expect(order).to eq [
:reserved,
:promise_headers,
:active,
:headers,
:half_close,
:data,
:close,
]
end
end
end
end
end
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