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################################################################################
# Copyright 2018-2020, Barcelona Supercomputing Center (BSC), Spain #
# Copyright 2015-2020, Johannes Gutenberg Universitaet Mainz, Germany #
# #
# This software was partially supported by the #
# EC H2020 funded project NEXTGenIO (Project ID: 671951, www.nextgenio.eu). #
# #
# This software was partially supported by the #
# ADA-FS project under the SPPEXA project funded by the DFG. #
# #
# SPDX-License-Identifier: MIT #
################################################################################
import ctypes
from marshmallow import Schema, fields, pre_load, post_load
from collections import namedtuple
class DIR_p(fields.Field):
"""Field that deserializes a ::DIR* return value"""
def _deserialize(self, value, attr, data, **kwargs):
return ctypes.c_void_p(value)
class Errno(fields.Field):
"""Field that deserialies an errno return value"""
def _deserialize(self, value, attr, data, **kwargs):
return int(value)
class ByteList(fields.Field):
"""Field that deserializes a list of bytes"""
def _deserialize(self, value, attr, data, **kwargs):
return bytes(value)
class StructTimespecSchema(Schema):
"""Schema that deserializes a struct timespec"""
tv_sec = fields.Integer(required=True)
tv_nsec = fields.Integer(required=True)
@post_load
def make_object(self, data, **kwargs):
return namedtuple('StructTimespec',
['tv_sec', 'tv_nsec'])(**data)
class StructStatSchema(Schema):
"""Schema that deserializes a struct stat"""
st_dev = fields.Integer(required=True)
st_ino = fields.Integer(required=True)
st_mode = fields.Integer(required=True)
st_nlink = fields.Integer(required=True)
st_uid = fields.Integer(required=True)
st_gid = fields.Integer(required=True)
st_rdev = fields.Integer(required=True)
st_size = fields.Integer(required=True)
st_blksize = fields.Integer(required=True)
st_blocks = fields.Integer(required=True)
st_atim = fields.Nested(StructTimespecSchema)
st_mtim = fields.Nested(StructTimespecSchema)
st_ctim = fields.Nested(StructTimespecSchema)
@post_load
def make_object(self, data, **kwargs):
return namedtuple('StructStat',
['st_dev', 'st_ino', 'st_mode', 'st_nlink', 'st_uid',
'st_gid', 'st_rdev', 'st_size', 'st_blksize', 'st_blocks',
'st_atim', 'st_mtim', 'st_ctim'])(**data)
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class StructStatxTimestampSchema(Schema):
"""Schema that deserializes a struct timespec"""
tv_sec = fields.Integer(required=True)
tv_nsec = fields.Integer(required=True)
@post_load
def make_object(self, data, **kwargs):
return namedtuple('StructStatxTimestampSchema',
['tv_sec', 'tv_nsec'])(**data)
class StructStatxSchema(Schema):
"""Schema that deserializes a struct stat"""
stx_mask = fields.Integer(required=True)
stx_blksize = fields.Integer(required=True)
stx_attributes = fields.Integer(required=True)
stx_nlink = fields.Integer(required=True)
stx_uid = fields.Integer(required=True)
stx_gid = fields.Integer(required=True)
stx_mode = fields.Integer(required=True)
stx_ino = fields.Integer(required=True)
stx_size = fields.Integer(required=True)
stx_blocks = fields.Integer(required=True)
stx_attributes_mask = fields.Integer(required=True)
stx_atime = fields.Nested(StructStatxTimestampSchema)
stx_btime = fields.Nested(StructStatxTimestampSchema)
stx_ctime = fields.Nested(StructStatxTimestampSchema)
stx_mtime = fields.Nested(StructStatxTimestampSchema)
stx_rdev_major = fields.Integer(required=True)
stx_rdev_minor = fields.Integer(required=True)
stx_dev_major = fields.Integer(required=True)
stx_dev_minor = fields.Integer(required=True)
@post_load
def make_object(self, data, **kwargs):
return namedtuple('StructStatx',
['stx_mask', 'stx_blksize', 'stx_attributes', 'stx_nlink', 'stx_uid',
'stx_gid', 'stx_mode', 'stx_ino', 'stx_size', 'stx_blocks', 'stx_attributes_mask',
'stx_atime', 'stx_btime', 'stx_ctime', 'stx_mtime', 'stx_rdev_major',
'stx_rdev_minor', 'stx_dev_major', 'stx_dev_minor'])(**data)
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class DirentStruct(Schema):
"""Schema that deserializes a struct dirent"""
d_ino = fields.Integer(required=True)
d_off = fields.Integer(required=True)
d_reclen = fields.Integer(required=True)
d_type = fields.Integer(required=True)
d_name = fields.Str(required=True)
@post_load
def make_object(self, data, **kwargs):
return namedtuple('DirentStruct',
['d_ino', 'd_off', 'd_reclen', 'd_type', 'd_name'])(**data)
class MkdirOutputSchema(Schema):
"""Schema to deserialize the results of a mkdir() execution"""
retval = fields.Integer(required=True)
errno = Errno(data_key='errnum', required=True)
@post_load
def make_object(self, data, **kwargs):
return namedtuple('MkdirReturn', ['retval', 'errno'])(**data)
class OpenOutputSchema(Schema):
"""Schema to deserialize the results of an open() execution"""
retval = fields.Integer(required=True)
errno = Errno(data_key='errnum', required=True)
@post_load
def make_object(self, data, **kwargs):
return namedtuple('OpenReturn', ['retval', 'errno'])(**data)
class OpendirOutputSchema(Schema):
"""Schema to deserialize the results of an opendir() execution"""
dirp = DIR_p(required=True, allow_none=True)
errno = Errno(data_key='errnum', required=True)
@post_load
def make_object(self, data, **kwargs):
return namedtuple('OpendirReturn', ['dirp', 'errno'])(**data)
class ReadOutputSchema(Schema):
"""Schema to deserialize the results of a read() execution"""
buf = ByteList(allow_none=True)
retval = fields.Integer(required=True)
errno = Errno(data_key='errnum', required=True)
@post_load
def make_object(self, data, **kwargs):
return namedtuple('ReadReturn', ['buf', 'retval', 'errno'])(**data)
class ReaddirOutputSchema(Schema):
"""Schema to deserialize the results of a readdir() execution"""
dirents = fields.List(fields.Nested(DirentStruct), allow_none=True)
errno = Errno(data_key='errnum', required=True)
@post_load
def make_object(self, data, **kwargs):
return namedtuple('ReaddirReturn', ['dirents', 'errno'])(**data)
class RmdirOutputSchema(Schema):
"""Schema to deserialize the results of an opendir() execution"""
retval = fields.Integer(required=True)
errno = Errno(data_key='errnum', required=True)
@post_load
def make_object(self, data, **kwargs):
return namedtuple('RmdirReturn', ['retval', 'errno'])(**data)
class WriteOutputSchema(Schema):
"""Schema to deserialize the results of a write() execution"""
retval = fields.Integer(required=True)
errno = Errno(data_key='errnum', required=True)
@post_load
def make_object(self, data, **kwargs):
return namedtuple('WriteReturn', ['retval', 'errno'])(**data)
class StatOutputSchema(Schema):
"""Schema to deserialize the results of a stat() execution"""
retval = fields.Integer(required=True)
statbuf = fields.Nested(StructStatSchema, required=True)
errno = Errno(data_key='errnum', required=True)
@post_load
def make_object(self, data, **kwargs):
return namedtuple('StatReturn', ['retval', 'statbuf', 'errno'])(**data)
class StatxOutputSchema(Schema):
"""Schema to deserialize the results of a stat() execution"""
retval = fields.Integer(required=True)
statbuf = fields.Nested(StructStatxSchema, required=True)
errno = Errno(data_key='errnum', required=True)
@post_load
def make_object(self, data, **kwargs):
return namedtuple('StatxReturn', ['retval', 'statbuf', 'errno'])(**data)
class IOParser:
OutputSchemas = {
'mkdir' : MkdirOutputSchema(),
'open' : OpenOutputSchema(),
'opendir' : OpendirOutputSchema(),
'read' : ReadOutputSchema(),
'readdir' : ReaddirOutputSchema(),
'rmdir' : RmdirOutputSchema(),
'write' : WriteOutputSchema(),
'stat' : StatOutputSchema(),
'statx' : StatxOutputSchema(),
}
def parse(self, command, output):
if command in self.OutputSchemas:
return self.OutputSchemas[command].loads(output)
else:
raise ValueError(f"Unknown I/O command {cmd}")