net.server_select: Better detection of errors for outgoing connections
On connection failure, a socket is marked readable and writable. So
to detect initial connection failures (connection refused, etc.) we
now watch for sockets becoming readable during initial connection,
and also read from readable sockets before writing to writable
sockets.
This should fix 'onconnect' being called for outgoing connections
that actually failed.
local timer = require "util.timer";
local setmetatable = setmetatable;
local os_time = os.time;
local _ENV = nil;
local watchdog_methods = {};
local watchdog_mt = { __index = watchdog_methods };
local function new(timeout, callback)
local watchdog = setmetatable({ timeout = timeout, last_reset = os_time(), callback = callback }, watchdog_mt);
timer.add_task(timeout+1, function (current_time)
local last_reset = watchdog.last_reset;
if not last_reset then
return;
end
local time_left = (last_reset + timeout) - current_time;
if time_left < 0 then
return watchdog:callback();
end
return time_left + 1;
end);
return watchdog;
end
function watchdog_methods:reset()
self.last_reset = os_time();
end
function watchdog_methods:cancel()
self.last_reset = nil;
end
return {
new = new;
};