[RFC][PATCH]Speed improvement on the http transport: add keepalive support

[Goffredo Baroncelli]

Hi all,

the enclosed patch adds the capability to make multiple request per connection on
the http transport. The patch includes the file keepalive.py from the 
urlgrabber library in order to avoid another dependency issue.

Below a bench on my machine ( Duron 800Mhz, with *local dns* & *local http server* )

$ time bzr.dev/bzr branch http://kreijack.homelinux.net:8077/bazaar/bazaar-ng_stable_branch
Branched 1528 revision(s).

real    4m50.499s
user    2m14.577s
sys     0m27.440s

$ time multiple-http-request/bzr branch http://kreijack.homelinux.net:8077/bazaar/bazaar-ng_stable_branch
Branched 1528 revision(s).

real    3m1.507s
user    1m32.812s
sys     0m14.980s

note the user time which with the patch decreases from 2m14 to 1m32.

The patch is posted for a review, comments are welcome.

Goffredo

 store/__init__.py      |    5
 store/text.py          |    1
 store/weave.py         |   11
 transport/http.py      |   52 +++-
 transport/keepalive.py |  587 +++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 640 insertions(+), 16 deletions(-)



-- 
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