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trace: [tracetool] Minimize the amount of per-backend code

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Backends now only contain the essential backend-specific code, and most of the work is moved to frontend code.

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Lluís Vilanova 2014-02-23 20:37:40 +01:00 • committed by Stefan Hajnoczi
parent ef0bd3bba6
commit 1dad2ce973
19 changed files with 303 additions and 395 deletions
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72
scripts/tracetool/backend/__init__.py
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@ -30,17 +30,24 @@ PUBLIC If exists and is set to 'True', the backend is considered "public".
Backend functions
-----------------
======== =======================================================================
Function Description
======== =======================================================================
<format> Called to generate the format- and backend-specific code for each of
the specified events. If the function does not exist, the backend is
considered not compatible with the given format.
======== =======================================================================
All the following functions are optional, and no output will be generated if
they do not exist.
=============================== ==============================================
Function Description
=============================== ==============================================
generate_<format>_begin(events) Generate backend- and format-specific file
header contents.
generate_<format>_end(events) Generate backend- and format-specific file
footer contents.
generate_<format>(event) Generate backend- and format-specific contents
for the given event.
=============================== ==============================================
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
__copyright__ = "Copyright 2012, Lluís Vilanova <vilanova@ac.upc.edu>"
__copyright__ = "Copyright 2012-2014, Lluís Vilanova <vilanova@ac.upc.edu>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@ -91,39 +98,24 @@ def exists(name):
return tracetool.try_import("tracetool.backend." + name)[1]
def compatible(backend, format):
"""Whether a backend is compatible with the given format."""
if not exists(backend):
raise ValueError("unknown backend: %s" % backend)
class Wrapper:
def __init__(self, backend, format):
self._backend = backend.replace("-", "_")
self._format = format.replace("-", "_")
assert exists(self._backend)
assert tracetool.format.exists(self._format)
backend = backend.replace("-", "_")
format = format.replace("-", "_")
def _run_function(self, name, *args, **kwargs):
func = tracetool.try_import("tracetool.backend." + self._backend,
name % self._format, None)[1]
if func is not None:
func(*args, **kwargs)
if backend == "nop":
return True
else:
func = tracetool.try_import("tracetool.backend." + backend,
format, None)[1]
return func is not None
def generate_begin(self, events):
self._run_function("generate_%s_begin", events)
def generate(self, event):
self._run_function("generate_%s", event)
def _empty(events):
pass
def generate(backend, format, events):
"""Generate the per-event output for the given (backend, format) pair."""
if not compatible(backend, format):
raise ValueError("backend '%s' not compatible with format '%s'" %
(backend, format))
backend = backend.replace("-", "_")
format = format.replace("-", "_")
if backend == "nop":
func = tracetool.try_import("tracetool.format." + format,
"nop", _empty)[1]
else:
func = tracetool.try_import("tracetool.backend." + backend,
format, None)[1]
func(events)
def generate_end(self, events):
self._run_function("generate_%s_end", events)