File

util.adminstream: Fix traceback on double-close (fixes #1913) In some circumstances, particularly with 'opportunistic_writes' and 'fatal_errors' enabled in the epoll backend, the connection may be closed halfway through the session close process (because it contains debug logging, which in the case of the watch:log() command, will trigger a write to the socket). The chosen fix is to cache session.conn in a local variable (we already did this later on, but this pulls it up to the top of the function, which is generally more correct anyway).

local data = {}
local getinfo = debug.getinfo;
local function linehook(ev, li)
	local S = getinfo(2, "S");
	if S and S.source and S.source:match"^@" then
		local file = S.source:sub(2);
		local lines = data[file];
		if not lines then
			lines = {};
			data[file] = lines;
			for line in io.lines(file) do
				lines[#lines+1] = line;
			end
		end
		io.stderr:write(ev, " ", file, " ", li, " ", lines[li], "\n");
	end
end
debug.sethook(linehook, "l");