python/lib/Lib/modjy/modjy_impl.py

###
#
# Copyright Alan Kennedy. 
# 
# You may contact the copyright holder at this uri:
# 
# http://www.xhaus.com/contact/modjy
# 
# The licence under which this code is released is the Apache License v2.0.
# 
# The terms and conditions of this license are listed in a file contained
# in the distribution that also contained this file, under the name
# LICENSE.txt.
# 
# You may also read a copy of the license at the following web address.
# 
# http://modjy.xhaus.com/LICENSE.txt
#
###

import types
import sys

from modjy_exceptions import *

class modjy_impl:

    def deal_with_app_return(self, environ, start_response_callable, app_return):
        self.log.debug("Processing app return type: %s" % str(type(app_return)))
        if isinstance(app_return, types.StringTypes):
            raise ReturnNotIterable("Application returned object that was not an iterable: %s" % str(type(app_return)))
        if type(app_return) is types.FileType:
            pass # TBD: What to do here? can't call fileno()
        if hasattr(app_return, '__len__') and callable(app_return.__len__):
            expected_pieces = app_return.__len__()
        else:
            expected_pieces = -1
        try:
            try:
                ix = 0
                for next_piece in app_return:
                    if not isinstance(next_piece, types.StringTypes):
                        raise NonStringOutput("Application returned iterable containing non-strings: %s" % str(type(next_piece)))
                    if ix == 0:
                        # The application may have called start_response in the first iteration
                        if not start_response_callable.called:
                            raise StartResponseNotCalled("Start_response callable was never called.")
                        if not start_response_callable.content_length \
                            and expected_pieces == 1 \
                            and start_response_callable.write_callable.num_writes == 0:
                                # Take the length of the first piece
                                start_response_callable.set_content_length(len(next_piece))
                    start_response_callable.write_callable(next_piece)
                    ix += 1
                    if ix == expected_pieces:
                        break
                if expected_pieces != -1 and ix != expected_pieces:
                    raise WrongLength("Iterator len() was wrong. Expected %d pieces: got %d" % (expected_pieces, ix) )
            except AttributeError, ax:
                if str(ax) == "__getitem__":
                    raise ReturnNotIterable("Application returned object that was not an iterable: %s" % str(type(app_return)))
                else:
                    raise ax
            except TypeError, tx:
                raise ReturnNotIterable("Application returned object that was not an iterable: %s" % str(type(app_return)))
            except ModjyException, mx:
                raise mx
            except Exception, x:
                raise ApplicationException(x)
        finally:
            if hasattr(app_return, 'close') and callable(app_return.close):
                app_return.close()

    def init_impl(self):
        self.do_j_env_params()

    def add_packages(self, package_list):
        packages = [p.strip() for p in package_list.split(';')]
        for p in packages:
            self.log.info("Adding java package %s to jython" % p)
            sys.add_package(p)

    def add_classdirs(self, classdir_list):
        classdirs = [cd.strip() for cd in classdir_list.split(';')]
        for cd in classdirs:
            self.log.info("Adding directory %s to jython class file search path" % cd)
            sys.add_classdir(cd)

    def add_extdirs(self, extdir_list):
        extdirs = [ed.strip() for ed in extdir_list.split(';')]
        for ed in extdirs:
            self.log.info("Adding directory %s for .jars and .zips search path" % ed)
            sys.add_extdir(self.expand_relative_path(ed))

    def do_j_env_params(self):
        if self.params['packages']:
            self.add_packages(self.params['packages'])
        if self.params['classdirs']:
            self.add_classdirs(self.params['classdirs'])
        if self.params['extdirs']:
            self.add_extdirs(self.params['extdirs'])