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<title>4.6.2 FieldStorage Examples</title>
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<H2><A NAME="SECTION006620000000000000000"></A><A NAME="pyapi-util-fstor-examples"></A>
<BR>
4.6.2 FieldStorage Examples
</H2>
<P>
The following examples demonstrate how to use the <var>file_callback</var>
parameter of the <tt class="class">FieldStorage</tt> constructor to control file
object creation. The <tt class="class">Storage</tt> classes created in both
examples derive from FileType, thereby providing extended file
functionality.
<P>
These examples are provided for demonstration purposes only. The
issue of temporary file location and security must be considered
when providing such overrides with mod_python in production use.
<P>
<DL>
<DT><STRONG>Simple file control using class constructor</STRONG></DT>
<DD><P>
This example uses the <tt class="class">FieldStorage</tt> class constructor to
create the file object, allowing simple control. It is not
advisable to add class variables to this if serving multiple sites
from apache. In that case use the factory method instead.
<P>
<div class="verbatim"><pre>
class Storage(file):
def __init__(self, advisory_filename):
self.advisory_filename = advisory_filename
self.delete_on_close = True
self.already_deleted = False
self.real_filename = '/someTempDir/thingy-unique-thingy'
super(Storage, self).__init__(self.real_filename, 'w+b')
def close(self):
if self.already_deleted:
return
super(Storage, self).close()
if self.delete_on_close:
self.already_deleted = True
os.remove(self.real_filename)
request_data = util.FieldStorage(request, keep_blank_values=True, file_callback=Storage)
</pre></div>
<P>
</DD>
<DT><STRONG>Advanced file control using object factory</STRONG></DT>
<DD><P>
Using a object factory can provide greater control over the
constructor parameters.
<P>
<div class="verbatim"><pre>
import os
class Storage(file):
def __init__(self, directory, advisory_filename):
self.advisory_filename = advisory_filename
self.delete_on_close = True
self.already_deleted = False
self.real_filename = directory + '/thingy-unique-thingy'
super(Storage, self).__init__(self.real_filename, 'w+b')
def close(self):
if self.already_deleted:
return
super(Storage, self).close()
if self.delete_on_close:
self.already_deleted = True
os.remove(self.real_filename)
class StorageFactory:
def __init__(self, directory):
self.dir = directory
def create(self, advisory_filename):
return Storage(self.dir, advisory_filename)
file_factory = StorageFactory(someDirectory)
[...sometime later...]
request_data = util.FieldStorage(request, keep_blank_values=True,
file_callback=file_factory.create)
</pre></div>
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