luasocket http and coroutines: attempt to yield across metamethod/C-call boundary
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- Subject: luasocket http and coroutines: attempt to yield across metamethod/C-call boundary
- From: Natanael Copa <natanael.copa@...>
- Date: Thu, 1 Apr 2010 11:13:36 +0200
Hi,
so, I'm trying to make a lua version of php's fopen("http://...";) and
python's urllib.urlopen(). Would be nice reuse the proxy handling,
handling of redirections etc in luasocket's http code.
So I thought I could make use of coroutines to and have a simple sink
that does coroutine.yield() and then make a read() function that
buffers things and give the data requested, read(size), read("*all")
read("*line") and afterward make a lines() functino for loops.
Here is the initial testcode with read() functiton that only gives
back the chunk from sink function:
http = require ("socket.http")
function openhttp(url, proxy)
local h = {}
h.co = coroutine.create(function()
http.request{
url = url,
proxy = proxy,
sink = function(chunk)
coroutine.yield(chunk)
end
}
end)
h.read = function(self, mode)
local status, value = coroutine.resume(h.co)
return value
end
return h
end
f = openhttp("http://tools.ietf.org/rfc/rfc2616.txt";)
print(f:read())
However, when i try to execute I get: attempt to yield across
metamethod/C-call boundary
Ideas on how to solve that? I tried to do the yield in the step
function too but got same result.
I suppose I could make a lua binding to netbsd's libfetch too but
would be nice use the existing stuff or extend luasocket to do this
too.
--
Natanael Copa