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local coroutine = coroutine;
local tonumber = tonumber;
local deadroutine = coroutine.create(function() end);
coroutine.resume(deadroutine);
module("httpstream")
local function parser(data, success_cb)
local function readline()
if not data then coroutine.yield("Unexpected EOF"); end
local pos, line = (data:find("\r\n", nil, true));
if not pos then
local newdata = coroutine.yield();
if not newdata then data = nil; coroutine.yield("Unexpected EOF"); end
data = data..newdata;
return readline();
end
line, data = data:sub(1, pos-1), data:sub(pos+2);
return line;
end
local function readlength(n)
if not data then coroutine.yield("Unexpected EOF"); end
while #data < n do
local newdata = coroutine.yield();
if not newdata then data = nil; coroutine.yield("Unexpected EOF"); end
data = data..newdata;
end
local r = data:sub(1, n);
data = data:sub(n + 1);
return r;
end
while true do
-- read status line
local status_line = readline();
local method, path, httpversion = status_line:match("^(%S+)%s+(%S+)%s+HTTP/(%S+)$");
if not method then coroutine.yield("invalid-status-line"); end
-- TODO parse url
local headers = {}; -- read headers
while true do
local line = readline();
if line == "" then break; end -- headers done
local key, val = line:match("^([^%s:]+): *(.*)$");
if not key then coroutine.yield("invalid-header-line"); end -- TODO handle multi-line and invalid headers
key = key:lower();
headers[key] = headers[key] and headers[key]..","..val or val;
end
-- read body
local len = tonumber(headers["content-length"]);
len = len or 0; -- TODO check for invalid len
local body = readlength(len);
success_cb({
method = method;
path = path;
httpversion = httpversion;
headers = headers;
body = body;
});
end
end
function new(success_cb, error_cb)
local co = coroutine.create(parser);
return {
feed = function(self, data)
local success, result = coroutine.resume(co, data, success_cb);
if result then
if result.method then
success_cb(result);
else -- error
error_cb(result);
co = deadroutine;
end
end
end;
};
end
return _M;
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