b160d7f84a
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
104 lines
3 KiB
Python
104 lines
3 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Format management.
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Creating new formats
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--------------------
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A new format named 'foo-bar' corresponds to Python module
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'tracetool/format/foo_bar.py'.
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A format module should provide a docstring, whose first non-empty line will be
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considered its short description.
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All formats must generate their contents through the 'tracetool.out' routine.
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Format functions
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----------------
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All the following functions are optional, and no output will be generated if
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they do not exist.
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======== =======================================================================
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Function Description
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======== =======================================================================
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begin Called to generate the format-specific file header.
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end Called to generate the format-specific file footer.
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nop Called to generate the per-event contents when the event is disabled or
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the selected backend is 'nop'.
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======== =======================================================================
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"""
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__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
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__copyright__ = "Copyright 2012-2014, Lluís Vilanova <vilanova@ac.upc.edu>"
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__license__ = "GPL version 2 or (at your option) any later version"
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__maintainer__ = "Stefan Hajnoczi"
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__email__ = "stefanha@linux.vnet.ibm.com"
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import os
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import tracetool
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def get_list():
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"""Get a list of (name, description) pairs."""
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res = []
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modnames = []
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for filename in os.listdir(tracetool.format.__path__[0]):
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if filename.endswith('.py') and filename != '__init__.py':
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modnames.append(filename.rsplit('.', 1)[0])
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for modname in sorted(modnames):
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module = tracetool.try_import("tracetool.format." + modname)
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# just in case; should never fail unless non-module files are put there
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if not module[0]:
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continue
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module = module[1]
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doc = module.__doc__
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if doc is None:
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doc = ""
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doc = doc.strip().split("\n")[0]
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name = modname.replace("_", "-")
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res.append((name, doc))
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return res
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def exists(name):
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"""Return whether the given format exists."""
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if len(name) == 0:
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return False
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name = name.replace("-", "_")
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return tracetool.try_import("tracetool.format." + name)[1]
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def _empty(events):
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pass
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def generate_begin(name, events):
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"""Generate the header of the format-specific file."""
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if not exists(name):
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raise ValueError("unknown format: %s" % name)
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name = name.replace("-", "_")
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func = tracetool.try_import("tracetool.format." + name,
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"begin", _empty)[1]
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func(events)
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def generate_end(name, events):
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"""Generate the footer of the format-specific file."""
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if not exists(name):
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raise ValueError("unknown format: %s" % name)
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name = name.replace("-", "_")
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func = tracetool.try_import("tracetool.format." + name,
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"end", _empty)[1]
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func(events)
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