2af282ec51
This adds and parses the --monitor option, so that a QMP monitor can be used in the storage daemon. The monitor offers commands defined in the QAPI schema at storage-daemon/qapi/qapi-schema.json. The --monitor options currently allows to create multiple monitors with the same ID. This part of the interface is considered unstable. We will reject such configurations as soon as we have a design for the monitor subsystem to perform these checks. (In the system emulator, we depend on QemuOpts rejecting duplicate IDs.) Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20200224143008.13362-21-kwolf@redhat.com> Acked-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
296 lines
8.1 KiB
Python
296 lines
8.1 KiB
Python
# -*- coding: utf-8 -*-
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#
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# QAPI code generation
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#
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# Copyright (c) 2018-2019 Red Hat Inc.
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#
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# Authors:
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# Markus Armbruster <armbru@redhat.com>
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# Marc-André Lureau <marcandre.lureau@redhat.com>
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#
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# This work is licensed under the terms of the GNU GPL, version 2.
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# See the COPYING file in the top-level directory.
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import errno
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import os
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import re
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from contextlib import contextmanager
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from qapi.common import *
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from qapi.schema import QAPISchemaVisitor
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class QAPIGen:
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def __init__(self, fname):
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self.fname = fname
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self._preamble = ''
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self._body = ''
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def preamble_add(self, text):
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self._preamble += text
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def add(self, text):
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self._body += text
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def get_content(self):
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return self._top() + self._preamble + self._body + self._bottom()
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def _top(self):
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return ''
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def _bottom(self):
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return ''
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def write(self, output_dir):
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# Include paths starting with ../ are used to reuse modules of the main
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# schema in specialised schemas. Don't overwrite the files that are
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# already generated for the main schema.
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if self.fname.startswith('../'):
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return
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pathname = os.path.join(output_dir, self.fname)
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odir = os.path.dirname(pathname)
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if odir:
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try:
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os.makedirs(odir)
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except os.error as e:
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if e.errno != errno.EEXIST:
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raise
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fd = os.open(pathname, os.O_RDWR | os.O_CREAT, 0o666)
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f = open(fd, 'r+', encoding='utf-8')
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text = self.get_content()
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oldtext = f.read(len(text) + 1)
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if text != oldtext:
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f.seek(0)
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f.truncate(0)
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f.write(text)
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f.close()
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def _wrap_ifcond(ifcond, before, after):
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if before == after:
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return after # suppress empty #if ... #endif
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assert after.startswith(before)
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out = before
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added = after[len(before):]
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if added[0] == '\n':
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out += '\n'
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added = added[1:]
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out += gen_if(ifcond)
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out += added
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out += gen_endif(ifcond)
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return out
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class QAPIGenCCode(QAPIGen):
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def __init__(self, fname):
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super().__init__(fname)
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self._start_if = None
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def start_if(self, ifcond):
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assert self._start_if is None
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self._start_if = (ifcond, self._body, self._preamble)
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def end_if(self):
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assert self._start_if
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self._wrap_ifcond()
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self._start_if = None
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def _wrap_ifcond(self):
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self._body = _wrap_ifcond(self._start_if[0],
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self._start_if[1], self._body)
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self._preamble = _wrap_ifcond(self._start_if[0],
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self._start_if[2], self._preamble)
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def get_content(self):
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assert self._start_if is None
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return super().get_content()
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class QAPIGenC(QAPIGenCCode):
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def __init__(self, fname, blurb, pydoc):
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super().__init__(fname)
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self._blurb = blurb
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self._copyright = '\n * '.join(re.findall(r'^Copyright .*', pydoc,
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re.MULTILINE))
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def _top(self):
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return mcgen('''
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/* AUTOMATICALLY GENERATED, DO NOT MODIFY */
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/*
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%(blurb)s
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*
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* %(copyright)s
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*/
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''',
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blurb=self._blurb, copyright=self._copyright)
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def _bottom(self):
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return mcgen('''
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/* Dummy declaration to prevent empty .o file */
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char qapi_dummy_%(name)s;
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''',
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name=c_fname(self.fname))
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class QAPIGenH(QAPIGenC):
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def _top(self):
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return super()._top() + guardstart(self.fname)
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def _bottom(self):
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return guardend(self.fname)
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@contextmanager
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def ifcontext(ifcond, *args):
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"""A 'with' statement context manager to wrap with start_if()/end_if()
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*args: any number of QAPIGenCCode
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Example::
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with ifcontext(ifcond, self._genh, self._genc):
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modify self._genh and self._genc ...
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Is equivalent to calling::
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self._genh.start_if(ifcond)
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self._genc.start_if(ifcond)
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modify self._genh and self._genc ...
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self._genh.end_if()
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self._genc.end_if()
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"""
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for arg in args:
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arg.start_if(ifcond)
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yield
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for arg in args:
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arg.end_if()
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class QAPIGenDoc(QAPIGen):
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def _top(self):
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return (super()._top()
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+ '@c AUTOMATICALLY GENERATED, DO NOT MODIFY\n\n')
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class QAPISchemaMonolithicCVisitor(QAPISchemaVisitor):
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def __init__(self, prefix, what, blurb, pydoc):
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self._prefix = prefix
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self._what = what
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self._genc = QAPIGenC(self._prefix + self._what + '.c',
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blurb, pydoc)
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self._genh = QAPIGenH(self._prefix + self._what + '.h',
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blurb, pydoc)
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def write(self, output_dir):
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self._genc.write(output_dir)
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self._genh.write(output_dir)
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class QAPISchemaModularCVisitor(QAPISchemaVisitor):
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def __init__(self, prefix, what, user_blurb, builtin_blurb, pydoc):
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self._prefix = prefix
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self._what = what
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self._user_blurb = user_blurb
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self._builtin_blurb = builtin_blurb
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self._pydoc = pydoc
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self._genc = None
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self._genh = None
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self._module = {}
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self._main_module = None
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@staticmethod
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def _is_user_module(name):
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return name and not name.startswith('./')
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@staticmethod
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def _is_builtin_module(name):
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return not name
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def _module_dirname(self, what, name):
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if self._is_user_module(name):
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return os.path.dirname(name)
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return ''
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def _module_basename(self, what, name):
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ret = '' if self._is_builtin_module(name) else self._prefix
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if self._is_user_module(name):
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basename = os.path.basename(name)
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ret += what
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if name != self._main_module:
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ret += '-' + os.path.splitext(basename)[0]
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else:
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name = name[2:] if name else 'builtin'
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ret += re.sub(r'-', '-' + name + '-', what)
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return ret
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def _module_filename(self, what, name):
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return os.path.join(self._module_dirname(what, name),
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self._module_basename(what, name))
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def _add_module(self, name, blurb):
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basename = self._module_filename(self._what, name)
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genc = QAPIGenC(basename + '.c', blurb, self._pydoc)
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genh = QAPIGenH(basename + '.h', blurb, self._pydoc)
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self._module[name] = (genc, genh)
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self._genc, self._genh = self._module[name]
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def _add_user_module(self, name, blurb):
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assert self._is_user_module(name)
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if self._main_module is None:
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self._main_module = name
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self._add_module(name, blurb)
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def _add_system_module(self, name, blurb):
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self._add_module(name and './' + name, blurb)
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def write(self, output_dir, opt_builtins=False):
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for name in self._module:
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if self._is_builtin_module(name) and not opt_builtins:
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continue
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(genc, genh) = self._module[name]
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genc.write(output_dir)
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genh.write(output_dir)
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def _begin_system_module(self, name):
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pass
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def _begin_user_module(self, name):
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pass
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def visit_module(self, name):
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if name is None:
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if self._builtin_blurb:
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self._add_system_module(None, self._builtin_blurb)
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self._begin_system_module(name)
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else:
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# The built-in module has not been created. No code may
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# be generated.
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self._genc = None
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self._genh = None
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else:
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self._add_user_module(name, self._user_blurb)
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self._begin_user_module(name)
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def visit_include(self, name, info):
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relname = os.path.relpath(self._module_filename(self._what, name),
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os.path.dirname(self._genh.fname))
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self._genh.preamble_add(mcgen('''
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#include "%(relname)s.h"
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''',
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relname=relname))
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