author | Alexandre Fayolle <alexandre.fayolle@logilab.fr> |
Fri, 12 Feb 2010 12:57:56 +0100 | |
branch | stable |
changeset 4556 | 43c14e0e8972 |
parent 4512 | e7ac20bf3629 |
child 4721 | 8f63691ccb7f |
permissions | -rw-r--r-- |
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"""custom storages for the system source""" |
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from os import unlink, path as osp |
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from cubicweb import Binary |
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from cubicweb.server.hook import Operation |
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ETYPE_ATTR_STORAGE = {} |
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def set_attribute_storage(repo, etype, attr, storage): |
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ETYPE_ATTR_STORAGE.setdefault(etype, {})[attr] = storage |
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repo.system_source.map_attribute(etype, attr, storage.sqlgen_callback) |
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def unset_attribute_storage(repo, etype, attr): |
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ETYPE_ATTR_STORAGE.setdefault(etype, {}).pop(attr, None) |
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repo.system_source.unmap_attribute(etype, attr) |
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class Storage(object): |
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"""abstract storage""" |
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def sqlgen_callback(self, generator, relation, linkedvar): |
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"""sql generator callback when some attribute with a custom storage is |
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accessed |
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""" |
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raise NotImplementedError() |
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def entity_added(self, entity, attr): |
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"""an entity using this storage for attr has been added""" |
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raise NotImplementedError() |
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def entity_updated(self, entity, attr): |
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"""an entity using this storage for attr has been updatded""" |
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raise NotImplementedError() |
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def entity_deleted(self, entity, attr): |
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"""an entity using this storage for attr has been deleted""" |
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raise NotImplementedError() |
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# TODO |
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# * make it configurable without code |
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# * better file path attribution |
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# * handle backup/restore |
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class BytesFileSystemStorage(Storage): |
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"""store Bytes attribute value on the file system""" |
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def __init__(self, defaultdir): |
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self.default_directory = defaultdir |
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def sqlgen_callback(self, generator, linkedvar, relation): |
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"""sql generator callback when some attribute with a custom storage is |
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accessed |
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""" |
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linkedvar.accept(generator) |
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return '_fsopen(%s.cw_%s)' % ( |
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linkedvar._q_sql.split('.', 1)[0], # table name |
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relation.r_type) # attribute name |
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|
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def entity_added(self, entity, attr): |
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"""an entity using this storage for attr has been added""" |
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if not entity._cw.transaction_data.get('fs_importing'): |
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try: |
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value = entity.pop(attr) |
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except KeyError: |
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pass |
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else: |
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fpath = self.new_fs_path(entity, attr) |
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# bytes storage used to store file's path |
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entity[attr]= Binary(fpath) |
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file(fpath, 'w').write(value.getvalue()) |
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AddFileOp(entity._cw, filepath=fpath) |
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# else entity[attr] is expected to be an already existant file path |
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69 |
|
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def entity_updated(self, entity, attr): |
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"""an entity using this storage for attr has been updatded""" |
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try: |
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value = entity.pop(attr) |
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except KeyError: |
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pass |
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76 |
else: |
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fpath = self.current_fs_path(entity, attr) |
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UpdateFileOp(entity._cw, filepath=fpath, filedata=value.getvalue()) |
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|
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def entity_deleted(self, entity, attr): |
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"""an entity using this storage for attr has been deleted""" |
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DeleteFileOp(entity._cw, filepath=self.current_fs_path(entity, attr)) |
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83 |
|
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def new_fs_path(self, entity, attr): |
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fspath = osp.join(self.default_directory, '%s_%s' % (entity.eid, attr)) |
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while osp.exists(fspath): |
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fspath = '_' + fspath |
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return fspath |
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89 |
|
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def current_fs_path(self, entity, attr): |
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91 |
sysource = entity._cw.pool.source('system') |
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92 |
cu = sysource.doexec(entity._cw, |
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93 |
'SELECT cw_%s FROM cw_%s WHERE cw_eid=%s' % ( |
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attr, entity.__regid__, entity.eid)) |
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dbmod = sysource.dbapi_module |
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96 |
return dbmod.process_value(cu.fetchone()[0], [None, dbmod.BINARY], |
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binarywrap=str) |
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|
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99 |
|
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class AddFileOp(Operation): |
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def rollback_event(self): |
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try: |
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103 |
unlink(self.filepath) |
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except: |
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105 |
pass |
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parents:
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106 |
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parents:
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107 |
class DeleteFileOp(Operation): |
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parents:
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108 |
def commit_event(self): |
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parents:
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109 |
try: |
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parents:
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110 |
unlink(self.filepath) |
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parents:
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111 |
except: |
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112 |
pass |
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parents:
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113 |
|
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114 |
class UpdateFileOp(Operation): |
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parents:
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115 |
def precommit_event(self): |
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parents:
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116 |
try: |
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parents:
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117 |
file(self.filepath, 'w').write(self.filedata) |
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[bfss] make it works when adding/updating entities with an attribute using bfss
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118 |
except Exception, ex: |
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parents:
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119 |
self.exception(str(ex)) |