function resolver:query(qname, qtype, qclass) -- - - - - - - - - - -- query
qname, qtype, qclass = standardize(qname, qtype, qclass)
+ local co = coroutine.running();
+ local q = get(self.wanted, qclass, qtype, qname);
+ if co and q then
+ -- We are already waiting for a reply to an identical query.
+ set(self.wanted, qclass, qtype, qname, co, true);
+ return true;
+ end
+
if not self.server then self:adddefaultnameservers(); end
local question = encodeQuestion(qname, qtype, qclass);
self.active[id][question] = o;
-- remember which coroutine wants the answer
- local co = coroutine.running();
if co then
set(self.wanted, qclass, qtype, qname, co, true);
- --set(self.yielded, co, qclass, qtype, qname, true);
end
local conn, err = self:getsocket(o.server)
end
end
-- Tried everything, failed
- self:cancel(qclass, qtype, qname, co, true);
+ self:cancel(qclass, qtype, qname);
end
end)
end
local cos = get(self.wanted, q.class, q.type, q.name);
if cos then
for co in pairs(cos) do
- set(self.yielded, co, q.class, q.type, q.name, nil);
if coroutine.status(co) == "suspended" then coroutine.resume(co); end
end
set(self.wanted, q.class, q.type, q.name, nil);
local cos = get(self.wanted, q.class, q.type, q.name);
if cos then
for co in pairs(cos) do
- set(self.yielded, co, q.class, q.type, q.name, nil);
if coroutine.status(co) == "suspended" then coroutine.resume(co); end
end
set(self.wanted, q.class, q.type, q.name, nil);
return response;
end
-function resolver:cancel(qclass, qtype, qname, co, call_handler)
+function resolver:cancel(qclass, qtype, qname)
local cos = get(self.wanted, qclass, qtype, qname);
if cos then
- if call_handler then
- coroutine.resume(co);
+ for co in pairs(cos) do
+ if coroutine.status(co) == "suspended" then coroutine.resume(co); end
end
- cos[co] = nil;
+ set(self.wanted, qclass, qtype, qname, nil);
end
end
function dns.resolver () -- - - - - - - - - - - - - - - - - - - - - resolver
-- this function seems to be redundant with resolver.new ()
- local r = { active = {}, cache = {}, unsorted = {}, wanted = {}, yielded = {}, best_server = 1 };
+ local r = { active = {}, cache = {}, unsorted = {}, wanted = {}, best_server = 1 };
setmetatable (r, resolver);
setmetatable (r.cache, cache_metatable);
setmetatable (r.unsorted, { __mode = 'kv' });