The issue seems to be a legacy CGI/WSGI issue with the older Trac 0.10
version that I'm using. It expects start_response to return a write
function. The paste.wsgilib.intercept_output worked fine for
rewriting web pages, but it didn't work for streaming content since it
would store everything in memory. So, I ended up with the following
solution which may not be pretty, but it works well and handles both
web pages and streaming file downloads.
In routes, do the following:
map.connect("wiki", "/trac", controller="EmbeddedTrac",
path_info="/")
map.connect('/trac/*path_info', controller='EmbeddedTrac')
Then add the following controller:
class EmbeddedtracController(BaseController):
def __init__(self):
# set application to the trac WSGI dispatch_request function
self.app = dispatch_request
self.trac_env_path = config['trac_env_path']
def __call__(self, environ, start_response):
"""Dispatches request to trac."""
environ['trac.env_path'] = self.trac_env_path
# seek back to the beginning of the wsgi.input parameter
(otherwise
# trac forms and file upload will not work correctly)
environ['input_saver.rewind']()
# pass request to trac -- wrap the start_response to provide
the
# legacy write return value.
self.lstData = []
def legacy_start_response(status, headers, exc_info = None):
start_response(status, headers, exc_info or
sys.exc_info())
def _write(data):
self.lstData.append(data)
return _write
app_iter = self.app(environ, legacy_start_response)
def generator():
# iterate through the web output which is used for
streaming
# large files
for item in app_iter:
yield item
if self.lstData:
yield self.lstData[0]
self.lstData = self.lstData[1:]
# send any remaining blocks (this typically handles a
single
# response such as a web page)
for item in self.lstData:
yield item
if hasattr(app_iter, 'close'):
app_iter.close()
return generator()
Any suggestions on improvements are always welcome!
Thanks,
Eric
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