def deferrer(marker, clock, delay):
"""
Tracing interceptor that returns a delayed result.
"""
return around(
lambda context: deferLater(clock, delay, lambda: trace(
context, 'enter', marker)),
lambda context: trace(context, 'leave', marker))
def thrower_sync(marker):
"""
Tracing interceptor that raises a synchronous exception.
"""
def _enter(context):
raise TracingError(marker)
return around(_enter, lambda context: trace(context, 'leave', marker),
'thrower_sync')
def test_around(self):
"""
Interceptor only has an enter and leave function.
"""
interceptors = [
tracer('a'),
around(tracing('enter', 'b'), tracing('leave', 'b')),
tracer('c')
]
self.assertThat(
execute(empty_context, interceptors),
succeeded(
Traced(
Equals(
v(('enter', 'a'), ('enter', 'b'), ('enter', 'c'),
('leave', 'c'), ('leave', 'b'), ('leave', 'a'))))))
def thrower(marker):
"""
Tracing interceptor that raises an asynchronous exception.
"""
return around(lambda context: fail(TracingError(marker)),
lambda context: trace(context, 'leave', marker), 'thrower')
def tracer(marker):
"""
Tracing interceptor.
"""
return around(lambda context: trace(context, 'enter', marker),
lambda context: trace(context, 'leave', marker), 'tracer')