Mercurial > hg
annotate tests/test-wireproto-serverreactor.py @ 37288:9bfcbe4f4745
wireproto: add streams to frame-based protocol
Previously, the frame-based protocol was just a series of frames,
with each frame associated with a request ID.
In order to scale the protocol, we'll want to enable the use of
compression. While it is possible to enable compression at the
socket/pipe level, this has its disadvantages. The big one is it
undermines the point of frames being standalone, atomic units that
can be read and written: if you add compression above the framing
protocol, you are back to having a stream-based protocol as opposed
to something frame-based.
So in order to preserve frames, compression needs to occur at
the frame payload level.
Compressing each frame's payload individually will limit compression
ratios because the window size of the compressor will be limited
by the max frame size, which is 32-64kb as currently defined. It
will also add CPU overhead, as it is more efficient for compressors
to operate on fewer, larger blocks of data than more, smaller blocks.
So compressing each frame independently is out.
This means we need to compress each frame's payload as if it is part
of a larger stream.
The simplest approach is to have 1 stream per connection. This
could certainly work. However, it has disadvantages (documented below).
We could also have 1 stream per RPC/command invocation. (This is the
model HTTP/2 goes with.) This also has disadvantages.
The main disadvantage to one global stream is that it has the very
real potential to create CPU bottlenecks doing compression. Networks
are only getting faster and the performance of single CPU cores has
been relatively flat. Newer compression formats like zstandard offer
better CPU cycle efficiency than predecessors like zlib. But it still
all too common to saturate your CPU with compression overhead long
before you saturate the network pipe.
The main disadvantage with streams per request is that you can't
reap the benefits of the compression context for multiple requests.
For example, if you send 1000 RPC requests (or HTTP/2 requests for
that matter), the response to each would have its own compression
context. The overall size of the raw responses would be larger because
compression contexts wouldn't be able to reference data from another
request or response.
The approach for streams as implemented in this commit is to support
N streams per connection and for streams to potentially span requests
and responses. As explained by the added internals docs, this
facilitates servers and clients delegating independent streams and
compression to independent threads / CPU cores. This helps alleviate
the CPU bottleneck of compression. This design also allows compression
contexts to be reused across requests/responses. This can result in
improved compression ratios and less overhead for compressors and
decompressors having to build new contexts.
Another feature that was defined was the ability for individual frames
within a stream to declare whether that individual frame's payload
uses the content encoding (read: compression) defined by the stream.
The idea here is that some servers may serve data from a combination
of caches and dynamic resolution. Data coming from caches may be
pre-compressed. We want to facilitate servers being able to essentially
stream bytes from caches to the wire with minimal overhead. Being
able to mix and match with frames are compressed within a stream
enables these types of advanced server functionality.
This commit defines the new streams mechanism. Basic code for
supporting streams in frames has been added. But that code is
seriously lacking and doesn't fully conform to the defined protocol.
For example, we don't close any streams. And support for content
encoding within streams is not yet implemented. The change was
rather invasive and I didn't think it would be reasonable to implement
the entire feature in a single commit.
For the record, I would have loved to reuse an existing multiplexing
protocol to build the new wire protocol on top of. However, I couldn't
find a protocol that offers the performance and scaling characteristics
that I desired. Namely, it should support multiple compression
contexts to facilitate scaling out to multiple CPU cores and
compression contexts should be able to live longer than single RPC
requests. HTTP/2 *almost* fits the bill. But the semantics of HTTP
message exchange state that streams can only live for a single
request-response. We /could/ tunnel on top of HTTP/2 streams and
frames with HEADER and DATA frames. But there's no guarantee that
HTTP/2 libraries and proxies would allow us to use HTTP/2 streams
and frames without the HTTP message exchange semantics defined in
RFC 7540 Section 8. Other RPC protocols like gRPC tunnel are built
on top of HTTP/2 and thus preserve its semantics of stream per
RPC invocation. Even QUIC does this. We could attempt to invent a
higher-level stream that spans HTTP/2 streams. But this would be
violating HTTP/2 because there is no guarantee that HTTP/2 streams
are routed to the same server. The best we can do - which is what
this protocol does - is shoehorn all request and response data into
a single HTTP message and create streams within. At that point, we've
defined a Content-Type in HTTP parlance. It just so happens our
media type can also work as a standalone, stream-based protocol,
without leaning on HTTP or similar protocol.
Differential Revision: https://phab.mercurial-scm.org/D2907
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 26 Mar 2018 11:00:16 -0700 |
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1 from __future__ import absolute_import, print_function |
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2 |
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3 import unittest |
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4 |
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5 from mercurial import ( |
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6 util, |
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7 wireprotoframing as framing, |
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8 ) |
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9 |
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10 ffs = framing.makeframefromhumanstring |
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11 |
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12 def makereactor(deferoutput=False): |
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13 return framing.serverreactor(deferoutput=deferoutput) |
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14 |
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15 def sendframes(reactor, gen): |
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16 """Send a generator of frame bytearray to a reactor. |
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17 |
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18 Emits a generator of results from ``onframerecv()`` calls. |
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19 """ |
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20 for frame in gen: |
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21 header = framing.parseheader(frame) |
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22 payload = frame[framing.FRAME_HEADER_SIZE:] |
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23 assert len(payload) == header.length |
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24 |
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25 yield reactor.onframerecv(framing.frame(header.requestid, |
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26 header.streamid, |
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27 header.streamflags, |
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28 header.typeid, |
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29 header.flags, |
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30 payload)) |
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31 |
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32 def sendcommandframes(reactor, stream, rid, cmd, args, datafh=None): |
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33 """Generate frames to run a command and send them to a reactor.""" |
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34 return sendframes(reactor, |
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35 framing.createcommandframes(stream, rid, cmd, args, |
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36 datafh)) |
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37 |
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38 class FrameTests(unittest.TestCase): |
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39 def testdataexactframesize(self): |
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40 data = util.bytesio(b'x' * framing.DEFAULT_MAX_FRAME_SIZE) |
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41 |
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42 stream = framing.stream(1) |
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43 frames = list(framing.createcommandframes(stream, 1, b'command', |
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44 {}, data)) |
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45 self.assertEqual(frames, [ |
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46 ffs(b'1 1 stream-begin command-name have-data command'), |
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47 ffs(b'1 1 0 command-data continuation %s' % data.getvalue()), |
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48 ffs(b'1 1 0 command-data eos ') |
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49 ]) |
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50 |
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51 def testdatamultipleframes(self): |
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52 data = util.bytesio(b'x' * (framing.DEFAULT_MAX_FRAME_SIZE + 1)) |
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53 |
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54 stream = framing.stream(1) |
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55 frames = list(framing.createcommandframes(stream, 1, b'command', {}, |
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56 data)) |
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57 self.assertEqual(frames, [ |
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58 ffs(b'1 1 stream-begin command-name have-data command'), |
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59 ffs(b'1 1 0 command-data continuation %s' % ( |
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60 b'x' * framing.DEFAULT_MAX_FRAME_SIZE)), |
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61 ffs(b'1 1 0 command-data eos x'), |
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62 ]) |
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63 |
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64 def testargsanddata(self): |
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65 data = util.bytesio(b'x' * 100) |
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66 |
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67 stream = framing.stream(1) |
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68 frames = list(framing.createcommandframes(stream, 1, b'command', { |
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69 b'key1': b'key1value', |
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70 b'key2': b'key2value', |
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71 b'key3': b'key3value', |
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72 }, data)) |
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73 |
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74 self.assertEqual(frames, [ |
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75 ffs(b'1 1 stream-begin command-name have-args|have-data command'), |
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76 ffs(br'1 1 0 command-argument 0 \x04\x00\x09\x00key1key1value'), |
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77 ffs(br'1 1 0 command-argument 0 \x04\x00\x09\x00key2key2value'), |
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78 ffs(br'1 1 0 command-argument eoa \x04\x00\x09\x00key3key3value'), |
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79 ffs(b'1 1 0 command-data eos %s' % data.getvalue()), |
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80 ]) |
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81 |
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82 def testtextoutputexcessiveargs(self): |
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83 """At most 255 formatting arguments are allowed.""" |
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84 with self.assertRaisesRegexp(ValueError, |
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85 'cannot use more than 255 formatting'): |
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86 args = [b'x' for i in range(256)] |
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87 list(framing.createtextoutputframe(None, 1, |
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88 [(b'bleh', args, [])])) |
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89 |
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90 def testtextoutputexcessivelabels(self): |
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91 """At most 255 labels are allowed.""" |
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92 with self.assertRaisesRegexp(ValueError, |
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93 'cannot use more than 255 labels'): |
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94 labels = [b'l' for i in range(256)] |
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95 list(framing.createtextoutputframe(None, 1, |
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96 [(b'bleh', [], labels)])) |
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97 |
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98 def testtextoutputformattingstringtype(self): |
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99 """Formatting string must be bytes.""" |
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100 with self.assertRaisesRegexp(ValueError, 'must use bytes formatting '): |
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101 list(framing.createtextoutputframe(None, 1, [ |
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102 (b'foo'.decode('ascii'), [], [])])) |
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103 |
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104 def testtextoutputargumentbytes(self): |
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105 with self.assertRaisesRegexp(ValueError, 'must use bytes for argument'): |
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106 list(framing.createtextoutputframe(None, 1, [ |
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107 (b'foo', [b'foo'.decode('ascii')], [])])) |
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108 |
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109 def testtextoutputlabelbytes(self): |
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110 with self.assertRaisesRegexp(ValueError, 'must use bytes for labels'): |
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111 list(framing.createtextoutputframe(None, 1, [ |
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112 (b'foo', [], [b'foo'.decode('ascii')])])) |
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113 |
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114 def testtextoutputtoolongformatstring(self): |
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115 with self.assertRaisesRegexp(ValueError, |
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116 'formatting string cannot be longer than'): |
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117 list(framing.createtextoutputframe(None, 1, [ |
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118 (b'x' * 65536, [], [])])) |
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119 |
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120 def testtextoutputtoolongargumentstring(self): |
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121 with self.assertRaisesRegexp(ValueError, |
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122 'argument string cannot be longer than'): |
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123 list(framing.createtextoutputframe(None, 1, [ |
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124 (b'bleh', [b'x' * 65536], [])])) |
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125 |
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126 def testtextoutputtoolonglabelstring(self): |
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127 with self.assertRaisesRegexp(ValueError, |
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128 'label string cannot be longer than'): |
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129 list(framing.createtextoutputframe(None, 1, [ |
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130 (b'bleh', [], [b'x' * 65536])])) |
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131 |
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132 def testtextoutput1simpleatom(self): |
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133 stream = framing.stream(1) |
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134 val = list(framing.createtextoutputframe(stream, 1, [ |
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135 (b'foo', [], [])])) |
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136 |
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137 self.assertEqual(val, [ |
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138 ffs(br'1 1 stream-begin text-output 0 \x03\x00\x00\x00foo'), |
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139 ]) |
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140 |
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141 def testtextoutput2simpleatoms(self): |
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142 stream = framing.stream(1) |
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143 val = list(framing.createtextoutputframe(stream, 1, [ |
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144 (b'foo', [], []), |
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145 (b'bar', [], []), |
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146 ])) |
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147 |
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148 self.assertEqual(val, [ |
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149 ffs(br'1 1 stream-begin text-output 0 ' |
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150 br'\x03\x00\x00\x00foo\x03\x00\x00\x00bar'), |
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151 ]) |
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152 |
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153 def testtextoutput1arg(self): |
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154 stream = framing.stream(1) |
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155 val = list(framing.createtextoutputframe(stream, 1, [ |
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156 (b'foo %s', [b'val1'], []), |
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157 ])) |
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158 |
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159 self.assertEqual(val, [ |
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160 ffs(br'1 1 stream-begin text-output 0 ' |
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161 br'\x06\x00\x00\x01\x04\x00foo %sval1'), |
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162 ]) |
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163 |
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164 def testtextoutput2arg(self): |
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165 stream = framing.stream(1) |
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166 val = list(framing.createtextoutputframe(stream, 1, [ |
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167 (b'foo %s %s', [b'val', b'value'], []), |
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168 ])) |
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169 |
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170 self.assertEqual(val, [ |
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171 ffs(br'1 1 stream-begin text-output 0 ' |
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172 br'\x09\x00\x00\x02\x03\x00\x05\x00foo %s %svalvalue'), |
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173 ]) |
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174 |
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175 def testtextoutput1label(self): |
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176 stream = framing.stream(1) |
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177 val = list(framing.createtextoutputframe(stream, 1, [ |
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178 (b'foo', [], [b'label']), |
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179 ])) |
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180 |
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181 self.assertEqual(val, [ |
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182 ffs(br'1 1 stream-begin text-output 0 ' |
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183 br'\x03\x00\x01\x00\x05foolabel'), |
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184 ]) |
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185 |
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186 def testargandlabel(self): |
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187 stream = framing.stream(1) |
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188 val = list(framing.createtextoutputframe(stream, 1, [ |
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189 (b'foo %s', [b'arg'], [b'label']), |
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190 ])) |
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191 |
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192 self.assertEqual(val, [ |
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193 ffs(br'1 1 stream-begin text-output 0 ' |
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194 br'\x06\x00\x01\x01\x05\x03\x00foo %slabelarg'), |
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195 ]) |
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196 |
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197 class ServerReactorTests(unittest.TestCase): |
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198 def _sendsingleframe(self, reactor, f): |
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199 results = list(sendframes(reactor, [f])) |
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200 self.assertEqual(len(results), 1) |
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201 |
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202 return results[0] |
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203 |
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204 def assertaction(self, res, expected): |
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205 self.assertIsInstance(res, tuple) |
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206 self.assertEqual(len(res), 2) |
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207 self.assertIsInstance(res[1], dict) |
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208 self.assertEqual(res[0], expected) |
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209 |
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210 def assertframesequal(self, frames, framestrings): |
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211 expected = [ffs(s) for s in framestrings] |
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212 self.assertEqual(list(frames), expected) |
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213 |
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214 def test1framecommand(self): |
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215 """Receiving a command in a single frame yields request to run it.""" |
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216 reactor = makereactor() |
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217 stream = framing.stream(1) |
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218 results = list(sendcommandframes(reactor, stream, 1, b'mycommand', {})) |
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219 self.assertEqual(len(results), 1) |
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220 self.assertaction(results[0], 'runcommand') |
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221 self.assertEqual(results[0][1], { |
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222 'requestid': 1, |
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223 'command': b'mycommand', |
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224 'args': {}, |
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225 'data': None, |
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226 }) |
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227 |
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228 result = reactor.oninputeof() |
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229 self.assertaction(result, 'noop') |
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230 |
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231 def test1argument(self): |
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232 reactor = makereactor() |
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233 stream = framing.stream(1) |
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234 results = list(sendcommandframes(reactor, stream, 41, b'mycommand', |
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235 {b'foo': b'bar'})) |
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236 self.assertEqual(len(results), 2) |
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237 self.assertaction(results[0], 'wantframe') |
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238 self.assertaction(results[1], 'runcommand') |
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239 self.assertEqual(results[1][1], { |
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240 'requestid': 41, |
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241 'command': b'mycommand', |
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242 'args': {b'foo': b'bar'}, |
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243 'data': None, |
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244 }) |
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245 |
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246 def testmultiarguments(self): |
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247 reactor = makereactor() |
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248 stream = framing.stream(1) |
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249 results = list(sendcommandframes(reactor, stream, 1, b'mycommand', |
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250 {b'foo': b'bar', b'biz': b'baz'})) |
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251 self.assertEqual(len(results), 3) |
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252 self.assertaction(results[0], 'wantframe') |
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253 self.assertaction(results[1], 'wantframe') |
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254 self.assertaction(results[2], 'runcommand') |
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255 self.assertEqual(results[2][1], { |
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256 'requestid': 1, |
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257 'command': b'mycommand', |
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258 'args': {b'foo': b'bar', b'biz': b'baz'}, |
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259 'data': None, |
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260 }) |
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261 |
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262 def testsimplecommanddata(self): |
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263 reactor = makereactor() |
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264 stream = framing.stream(1) |
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265 results = list(sendcommandframes(reactor, stream, 1, b'mycommand', {}, |
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266 util.bytesio(b'data!'))) |
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267 self.assertEqual(len(results), 2) |
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268 self.assertaction(results[0], 'wantframe') |
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269 self.assertaction(results[1], 'runcommand') |
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270 self.assertEqual(results[1][1], { |
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271 'requestid': 1, |
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272 'command': b'mycommand', |
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273 'args': {}, |
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274 'data': b'data!', |
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275 }) |
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276 |
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277 def testmultipledataframes(self): |
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278 frames = [ |
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279 ffs(b'1 1 stream-begin command-name have-data mycommand'), |
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280 ffs(b'1 1 0 command-data continuation data1'), |
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281 ffs(b'1 1 0 command-data continuation data2'), |
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282 ffs(b'1 1 0 command-data eos data3'), |
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283 ] |
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284 |
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285 reactor = makereactor() |
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286 results = list(sendframes(reactor, frames)) |
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287 self.assertEqual(len(results), 4) |
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288 for i in range(3): |
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289 self.assertaction(results[i], 'wantframe') |
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290 self.assertaction(results[3], 'runcommand') |
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291 self.assertEqual(results[3][1], { |
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292 'requestid': 1, |
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293 'command': b'mycommand', |
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294 'args': {}, |
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295 'data': b'data1data2data3', |
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296 }) |
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297 |
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298 def testargumentanddata(self): |
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299 frames = [ |
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300 ffs(b'1 1 stream-begin command-name have-args|have-data command'), |
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301 ffs(br'1 1 0 command-argument 0 \x03\x00\x03\x00keyval'), |
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302 ffs(br'1 1 0 command-argument eoa \x03\x00\x03\x00foobar'), |
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303 ffs(b'1 1 0 command-data continuation value1'), |
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304 ffs(b'1 1 0 command-data eos value2'), |
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305 ] |
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306 |
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307 reactor = makereactor() |
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308 results = list(sendframes(reactor, frames)) |
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309 |
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310 self.assertaction(results[-1], 'runcommand') |
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311 self.assertEqual(results[-1][1], { |
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312 'requestid': 1, |
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313 'command': b'command', |
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314 'args': { |
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315 b'key': b'val', |
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316 b'foo': b'bar', |
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317 }, |
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318 'data': b'value1value2', |
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319 }) |
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320 |
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321 def testunexpectedcommandargument(self): |
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322 """Command argument frame when not running a command is an error.""" |
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323 result = self._sendsingleframe( |
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324 makereactor(), ffs(b'1 1 stream-begin command-argument 0 ignored')) |
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325 self.assertaction(result, 'error') |
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326 self.assertEqual(result[1], { |
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327 'message': b'expected command frame; got 2', |
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328 }) |
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329 |
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330 def testunexpectedcommandargumentreceiving(self): |
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331 """Same as above but the command is receiving.""" |
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332 results = list(sendframes(makereactor(), [ |
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333 ffs(b'1 1 stream-begin command-name have-data command'), |
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334 ffs(b'1 1 0 command-argument eoa ignored'), |
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335 ])) |
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336 |
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337 self.assertaction(results[1], 'error') |
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338 self.assertEqual(results[1][1], { |
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339 'message': b'received command argument frame for request that is ' |
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340 b'not expecting arguments: 1', |
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341 }) |
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342 |
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343 def testunexpectedcommanddata(self): |
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344 """Command argument frame when not running a command is an error.""" |
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345 result = self._sendsingleframe( |
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346 makereactor(), ffs(b'1 1 stream-begin command-data 0 ignored')) |
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347 self.assertaction(result, 'error') |
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348 self.assertEqual(result[1], { |
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349 'message': b'expected command frame; got 3', |
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350 }) |
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351 |
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352 def testunexpectedcommanddatareceiving(self): |
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353 """Same as above except the command is receiving.""" |
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354 results = list(sendframes(makereactor(), [ |
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355 ffs(b'1 1 stream-begin command-name have-args command'), |
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356 ffs(b'1 1 0 command-data eos ignored'), |
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357 ])) |
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358 |
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359 self.assertaction(results[1], 'error') |
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360 self.assertEqual(results[1][1], { |
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361 'message': b'received command data frame for request that is not ' |
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362 b'expecting data: 1', |
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363 }) |
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364 |
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365 def testmissingcommandframeflags(self): |
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366 """Command name frame must have flags set.""" |
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367 result = self._sendsingleframe( |
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368 makereactor(), ffs(b'1 1 stream-begin command-name 0 command')) |
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369 self.assertaction(result, 'error') |
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370 self.assertEqual(result[1], { |
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371 'message': b'missing frame flags on command frame', |
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372 }) |
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373 |
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374 def testconflictingrequestidallowed(self): |
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375 """Multiple fully serviced commands with same request ID is allowed.""" |
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376 reactor = makereactor() |
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377 results = [] |
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378 outstream = framing.stream(2) |
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379 results.append(self._sendsingleframe( |
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380 reactor, ffs(b'1 1 stream-begin command-name eos command'))) |
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381 result = reactor.onbytesresponseready(outstream, 1, b'response1') |
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382 self.assertaction(result, 'sendframes') |
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383 list(result[1]['framegen']) |
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384 results.append(self._sendsingleframe( |
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385 reactor, ffs(b'1 1 0 command-name eos command'))) |
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386 result = reactor.onbytesresponseready(outstream, 1, b'response2') |
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387 self.assertaction(result, 'sendframes') |
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388 list(result[1]['framegen']) |
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389 results.append(self._sendsingleframe( |
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390 reactor, ffs(b'1 1 0 command-name eos command'))) |
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391 result = reactor.onbytesresponseready(outstream, 1, b'response3') |
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392 self.assertaction(result, 'sendframes') |
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393 list(result[1]['framegen']) |
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394 |
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395 for i in range(3): |
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396 self.assertaction(results[i], 'runcommand') |
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397 self.assertEqual(results[i][1], { |
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398 'requestid': 1, |
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399 'command': b'command', |
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400 'args': {}, |
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401 'data': None, |
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402 }) |
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403 |
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404 def testconflictingrequestid(self): |
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405 """Request ID for new command matching in-flight command is illegal.""" |
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406 results = list(sendframes(makereactor(), [ |
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407 ffs(b'1 1 stream-begin command-name have-args command'), |
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408 ffs(b'1 1 0 command-name eos command'), |
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409 ])) |
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410 |
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411 self.assertaction(results[0], 'wantframe') |
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412 self.assertaction(results[1], 'error') |
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413 self.assertEqual(results[1][1], { |
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414 'message': b'request with ID 1 already received', |
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415 }) |
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416 |
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417 def testinterleavedcommands(self): |
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418 results = list(sendframes(makereactor(), [ |
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419 ffs(b'1 1 stream-begin command-name have-args command1'), |
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420 ffs(b'3 1 0 command-name have-args command3'), |
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421 ffs(br'1 1 0 command-argument 0 \x03\x00\x03\x00foobar'), |
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422 ffs(br'3 1 0 command-argument 0 \x03\x00\x03\x00bizbaz'), |
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423 ffs(br'3 1 0 command-argument eoa \x03\x00\x03\x00keyval'), |
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424 ffs(br'1 1 0 command-argument eoa \x04\x00\x03\x00key1val'), |
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425 ])) |
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426 |
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427 self.assertEqual([t[0] for t in results], [ |
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428 'wantframe', |
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429 'wantframe', |
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430 'wantframe', |
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431 'wantframe', |
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432 'runcommand', |
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433 'runcommand', |
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434 ]) |
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435 |
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436 self.assertEqual(results[4][1], { |
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437 'requestid': 3, |
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438 'command': 'command3', |
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439 'args': {b'biz': b'baz', b'key': b'val'}, |
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440 'data': None, |
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441 }) |
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442 self.assertEqual(results[5][1], { |
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443 'requestid': 1, |
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444 'command': 'command1', |
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445 'args': {b'foo': b'bar', b'key1': b'val'}, |
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446 'data': None, |
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447 }) |
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448 |
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449 def testmissingargumentframe(self): |
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450 # This test attempts to test behavior when reactor has an incomplete |
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451 # command request waiting on argument data. But it doesn't handle that |
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452 # scenario yet. So this test does nothing of value. |
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453 frames = [ |
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454 ffs(b'1 1 stream-begin command-name have-args command'), |
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455 ] |
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456 |
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457 results = list(sendframes(makereactor(), frames)) |
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458 self.assertaction(results[0], 'wantframe') |
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459 |
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460 def testincompleteargumentname(self): |
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461 """Argument frame with incomplete name.""" |
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462 frames = [ |
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463 ffs(b'1 1 stream-begin command-name have-args command1'), |
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464 ffs(br'1 1 0 command-argument eoa \x04\x00\xde\xadfoo'), |
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465 ] |
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466 |
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467 results = list(sendframes(makereactor(), frames)) |
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468 self.assertEqual(len(results), 2) |
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469 self.assertaction(results[0], 'wantframe') |
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470 self.assertaction(results[1], 'error') |
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471 self.assertEqual(results[1][1], { |
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472 'message': b'malformed argument frame: partial argument name', |
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473 }) |
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474 |
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475 def testincompleteargumentvalue(self): |
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476 """Argument frame with incomplete value.""" |
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477 frames = [ |
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478 ffs(b'1 1 stream-begin command-name have-args command'), |
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479 ffs(br'1 1 0 command-argument eoa \x03\x00\xaa\xaafoopartialvalue'), |
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480 ] |
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481 |
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482 results = list(sendframes(makereactor(), frames)) |
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483 self.assertEqual(len(results), 2) |
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484 self.assertaction(results[0], 'wantframe') |
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485 self.assertaction(results[1], 'error') |
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486 self.assertEqual(results[1][1], { |
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487 'message': b'malformed argument frame: partial argument value', |
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488 }) |
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489 |
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490 def testmissingcommanddataframe(self): |
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491 # The reactor doesn't currently handle partially received commands. |
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492 # So this test is failing to do anything with request 1. |
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493 frames = [ |
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494 ffs(b'1 1 stream-begin command-name have-data command1'), |
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495 ffs(b'3 1 0 command-name eos command2'), |
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496 ] |
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497 results = list(sendframes(makereactor(), frames)) |
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498 self.assertEqual(len(results), 2) |
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499 self.assertaction(results[0], 'wantframe') |
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500 self.assertaction(results[1], 'runcommand') |
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501 |
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502 def testmissingcommanddataframeflags(self): |
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503 frames = [ |
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504 ffs(b'1 1 stream-begin command-name have-data command1'), |
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505 ffs(b'1 1 0 command-data 0 data'), |
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506 ] |
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507 results = list(sendframes(makereactor(), frames)) |
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508 self.assertEqual(len(results), 2) |
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509 self.assertaction(results[0], 'wantframe') |
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510 self.assertaction(results[1], 'error') |
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511 self.assertEqual(results[1][1], { |
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512 'message': b'command data frame without flags', |
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513 }) |
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514 |
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515 def testframefornonreceivingrequest(self): |
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516 """Receiving a frame for a command that is not receiving is illegal.""" |
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517 results = list(sendframes(makereactor(), [ |
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518 ffs(b'1 1 stream-begin command-name eos command1'), |
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519 ffs(b'3 1 0 command-name have-data command3'), |
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520 ffs(b'5 1 0 command-argument eoa ignored'), |
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521 ])) |
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522 self.assertaction(results[2], 'error') |
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523 self.assertEqual(results[2][1], { |
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524 'message': b'received frame for request that is not receiving: 5', |
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525 }) |
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526 |
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527 def testsimpleresponse(self): |
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528 """Bytes response to command sends result frames.""" |
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529 reactor = makereactor() |
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530 instream = framing.stream(1) |
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531 list(sendcommandframes(reactor, instream, 1, b'mycommand', {})) |
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532 |
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533 outstream = framing.stream(2) |
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534 result = reactor.onbytesresponseready(outstream, 1, b'response') |
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535 self.assertaction(result, 'sendframes') |
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536 self.assertframesequal(result[1]['framegen'], [ |
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537 b'1 2 stream-begin bytes-response eos response', |
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538 ]) |
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539 |
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540 def testmultiframeresponse(self): |
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541 """Bytes response spanning multiple frames is handled.""" |
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542 first = b'x' * framing.DEFAULT_MAX_FRAME_SIZE |
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543 second = b'y' * 100 |
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544 |
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545 reactor = makereactor() |
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546 instream = framing.stream(1) |
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547 list(sendcommandframes(reactor, instream, 1, b'mycommand', {})) |
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548 |
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549 outstream = framing.stream(2) |
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550 result = reactor.onbytesresponseready(outstream, 1, first + second) |
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551 self.assertaction(result, 'sendframes') |
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552 self.assertframesequal(result[1]['framegen'], [ |
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553 b'1 2 stream-begin bytes-response continuation %s' % first, |
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554 b'1 2 0 bytes-response eos %s' % second, |
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555 ]) |
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556 |
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557 def testapplicationerror(self): |
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558 reactor = makereactor() |
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559 instream = framing.stream(1) |
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560 list(sendcommandframes(reactor, instream, 1, b'mycommand', {})) |
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561 |
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562 outstream = framing.stream(2) |
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563 result = reactor.onapplicationerror(outstream, 1, b'some message') |
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564 self.assertaction(result, 'sendframes') |
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565 self.assertframesequal(result[1]['framegen'], [ |
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566 b'1 2 stream-begin error-response application some message', |
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567 ]) |
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568 |
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569 def test1commanddeferresponse(self): |
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570 """Responses when in deferred output mode are delayed until EOF.""" |
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571 reactor = makereactor(deferoutput=True) |
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572 instream = framing.stream(1) |
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573 results = list(sendcommandframes(reactor, instream, 1, b'mycommand', |
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574 {})) |
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575 self.assertEqual(len(results), 1) |
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576 self.assertaction(results[0], 'runcommand') |
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577 |
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578 outstream = framing.stream(2) |
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579 result = reactor.onbytesresponseready(outstream, 1, b'response') |
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580 self.assertaction(result, 'noop') |
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581 result = reactor.oninputeof() |
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582 self.assertaction(result, 'sendframes') |
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583 self.assertframesequal(result[1]['framegen'], [ |
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584 b'1 2 stream-begin bytes-response eos response', |
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585 ]) |
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586 |
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587 def testmultiplecommanddeferresponse(self): |
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588 reactor = makereactor(deferoutput=True) |
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589 instream = framing.stream(1) |
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590 list(sendcommandframes(reactor, instream, 1, b'command1', {})) |
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591 list(sendcommandframes(reactor, instream, 3, b'command2', {})) |
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592 |
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593 outstream = framing.stream(2) |
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594 result = reactor.onbytesresponseready(outstream, 1, b'response1') |
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595 self.assertaction(result, 'noop') |
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596 result = reactor.onbytesresponseready(outstream, 3, b'response2') |
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597 self.assertaction(result, 'noop') |
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598 result = reactor.oninputeof() |
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599 self.assertaction(result, 'sendframes') |
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600 self.assertframesequal(result[1]['framegen'], [ |
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601 b'1 2 stream-begin bytes-response eos response1', |
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602 b'3 2 0 bytes-response eos response2' |
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603 ]) |
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604 |
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605 def testrequestidtracking(self): |
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606 reactor = makereactor(deferoutput=True) |
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607 instream = framing.stream(1) |
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608 list(sendcommandframes(reactor, instream, 1, b'command1', {})) |
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609 list(sendcommandframes(reactor, instream, 3, b'command2', {})) |
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610 list(sendcommandframes(reactor, instream, 5, b'command3', {})) |
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611 |
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612 # Register results for commands out of order. |
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613 outstream = framing.stream(2) |
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614 reactor.onbytesresponseready(outstream, 3, b'response3') |
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615 reactor.onbytesresponseready(outstream, 1, b'response1') |
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616 reactor.onbytesresponseready(outstream, 5, b'response5') |
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617 |
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618 result = reactor.oninputeof() |
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619 self.assertaction(result, 'sendframes') |
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620 self.assertframesequal(result[1]['framegen'], [ |
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621 b'3 2 stream-begin bytes-response eos response3', |
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622 b'1 2 0 bytes-response eos response1', |
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623 b'5 2 0 bytes-response eos response5', |
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624 ]) |
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625 |
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626 def testduplicaterequestonactivecommand(self): |
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627 """Receiving a request ID that matches a request that isn't finished.""" |
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628 reactor = makereactor() |
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629 stream = framing.stream(1) |
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630 list(sendcommandframes(reactor, stream, 1, b'command1', {})) |
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631 results = list(sendcommandframes(reactor, stream, 1, b'command1', {})) |
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632 |
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633 self.assertaction(results[0], 'error') |
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634 self.assertEqual(results[0][1], { |
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635 'message': b'request with ID 1 is already active', |
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636 }) |
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637 |
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638 def testduplicaterequestonactivecommandnosend(self): |
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639 """Same as above but we've registered a response but haven't sent it.""" |
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640 reactor = makereactor() |
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641 instream = framing.stream(1) |
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642 list(sendcommandframes(reactor, instream, 1, b'command1', {})) |
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643 outstream = framing.stream(2) |
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644 reactor.onbytesresponseready(outstream, 1, b'response') |
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645 |
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646 # We've registered the response but haven't sent it. From the |
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647 # perspective of the reactor, the command is still active. |
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648 |
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649 results = list(sendcommandframes(reactor, instream, 1, b'command1', {})) |
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650 self.assertaction(results[0], 'error') |
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651 self.assertEqual(results[0][1], { |
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652 'message': b'request with ID 1 is already active', |
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653 }) |
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654 |
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655 def testduplicaterequestargumentframe(self): |
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656 """Variant on above except we sent an argument frame instead of name.""" |
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657 reactor = makereactor() |
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658 stream = framing.stream(1) |
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659 list(sendcommandframes(reactor, stream, 1, b'command', {})) |
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660 results = list(sendframes(reactor, [ |
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661 ffs(b'3 1 stream-begin command-name have-args command'), |
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662 ffs(b'1 1 0 command-argument 0 ignored'), |
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663 ])) |
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664 self.assertaction(results[0], 'wantframe') |
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665 self.assertaction(results[1], 'error') |
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666 self.assertEqual(results[1][1], { |
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667 'message': 'received frame for request that is still active: 1', |
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668 }) |
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669 |
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670 def testduplicaterequestaftersend(self): |
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671 """We can use a duplicate request ID after we've sent the response.""" |
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672 reactor = makereactor() |
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673 instream = framing.stream(1) |
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674 list(sendcommandframes(reactor, instream, 1, b'command1', {})) |
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675 outstream = framing.stream(2) |
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676 res = reactor.onbytesresponseready(outstream, 1, b'response') |
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677 list(res[1]['framegen']) |
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678 |
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679 results = list(sendcommandframes(reactor, instream, 1, b'command1', {})) |
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680 self.assertaction(results[0], 'runcommand') |
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Gregory Szorc <gregory.szorc@gmail.com>
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681 |
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Gregory Szorc <gregory.szorc@gmail.com>
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682 if __name__ == '__main__': |
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Gregory Szorc <gregory.szorc@gmail.com>
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683 import silenttestrunner |
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Gregory Szorc <gregory.szorc@gmail.com>
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684 silenttestrunner.main(__name__) |