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import asyncio
# Helper Mocking classes for the tests.
class MockStream:
"""
A class simulating an asyncio input buffer, optionally raising a
special exception every other read.
"""
class TestError(BaseException):
pass
def __init__(self, data, interrupt_every=0):
self.data = data
self.counter = 0
self.pos = 0
self.interrupt_every = interrupt_every
def tick(self):
self.counter += 1
if not self.interrupt_every:
return
if (self.counter % self.interrupt_every) == 0:
raise self.TestError()
async def read(self, want):
self.tick()
want = 5
result = self.data[self.pos : self.pos + want]
self.pos += len(result)
return result
async def readline(self):
self.tick()
find = self.data.find(b"\n", self.pos)
if find >= 0:
result = self.data[self.pos : find + 1]
else:
result = self.data[self.pos :]
self.pos += len(result)
return result
async def readexactly(self, length):
self.tick()
result = self.data[self.pos : self.pos + length]
if len(result) < length:
raise asyncio.IncompleteReadError(result, None)
self.pos += len(result)
return result
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