diff options
Diffstat (limited to 'net/adns.lua')
| -rw-r--r-- | net/adns.lua | 44 |
1 files changed, 31 insertions, 13 deletions
diff --git a/net/adns.lua b/net/adns.lua index 560e4b53..48b724c0 100644 --- a/net/adns.lua +++ b/net/adns.lua @@ -8,13 +8,17 @@ local server = require "net.server"; local new_resolver = require "net.dns".resolver; +local promise = require "util.promise"; local log = require "util.logger".init("adns"); -local coroutine, tostring, pcall = coroutine, tostring, pcall; +log("debug", "Using legacy DNS API (missing lua-unbound?)"); -- TODO write docs about luaunbound +-- TODO Raise log level once packages are available + +local coroutine, pcall = coroutine, pcall; local setmetatable = setmetatable; -local function dummy_send(sock, data, i, j) return (j-i)+1; end +local function dummy_send(sock, data, i, j) return (j-i)+1; end -- luacheck: ignore 212 local _ENV = nil; -- luacheck: std none @@ -29,8 +33,7 @@ local function new_async_socket(sock, resolver) local peername = "<unknown>"; local listener = {}; local handler = {}; - local err; - function listener.onincoming(conn, data) + function listener.onincoming(conn, data) -- luacheck: ignore 212/conn if data then resolver:feed(handler, data); end @@ -40,15 +43,18 @@ local function new_async_socket(sock, resolver) log("warn", "DNS socket for %s disconnected: %s", peername, err); local servers = resolver.server; if resolver.socketset[conn] == resolver.best_server and resolver.best_server == #servers then - log("error", "Exhausted all %d configured DNS servers, next lookup will try %s again", #servers, servers[1]); + log("warn", "Exhausted all %d configured DNS servers, next lookup will try %s again", #servers, servers[1]); end resolver:servfail(conn); -- Let the magic commence end end - handler, err = server.wrapclient(sock, "dns", 53, listener); - if not handler then - return nil, err; + do + local err; + handler, err = server.wrapclient(sock, "dns", 53, listener); + if not handler then + return nil, err; + end end handler.settimeout = function () end @@ -71,11 +77,11 @@ function async_resolver_methods:lookup(handler, qname, qtype, qclass) handler(peek); return; end - log("debug", "Records for %s not in cache, sending query (%s)...", qname, tostring(coroutine.running())); + log("debug", "Records for %s not in cache, sending query (%s)...", qname, coroutine.running()); local ok, err = resolver:query(qname, qtype, qclass); if ok then coroutine.yield(setmetatable({ resolver, qclass or "IN", qtype or "A", qname, coroutine.running()}, query_mt)); -- Wait for reply - log("debug", "Reply for %s (%s)", qname, tostring(coroutine.running())); + log("debug", "Reply for %s (%s)", qname, coroutine.running()); end if ok then ok, err = pcall(handler, resolver:peek(qname, qtype, qclass)); @@ -84,13 +90,25 @@ function async_resolver_methods:lookup(handler, qname, qtype, qclass) ok, err = pcall(handler, nil, err); end if not ok then - log("error", "Error in DNS response handler: %s", tostring(err)); + log("error", "Error in DNS response handler: %s", err); end end)(resolver:peek(qname, qtype, qclass)); end -function query_methods:cancel(call_handler, reason) - log("warn", "Cancelling DNS lookup for %s", tostring(self[4])); +function async_resolver_methods:lookup_promise(qname, qtype, qclass) + return promise.new(function (resolve, reject) + local function handler(answer) + if not answer then + return reject(); + end + resolve(answer); + end + self:lookup(handler, qname, qtype, qclass); + end); +end + +function query_methods:cancel(call_handler, reason) -- luacheck: ignore 212/reason + log("warn", "Cancelling DNS lookup for %s", self[4]); self[1].cancel(self[2], self[3], self[4], self[5], call_handler); end |