Sat, 17 Oct 2009 23:48:30 +0500
modulemanager: Slightly rearranged code for more robust unloading of modules.
-- Prosody IM -- Copyright (C) 2009 Tobias Markmann -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- local st = require "util.stanza"; local zlib = require "zlib"; local pcall = pcall; local xmlns_compression_feature = "http://jabber.org/features/compress" local xmlns_compression_protocol = "http://jabber.org/protocol/compress" local compression_stream_feature = st.stanza("compression", {xmlns=xmlns_compression_feature}):tag("method"):text("zlib"):up(); local compression_level = module:get_option("compression_level"); -- if not defined assume admin wants best compression if compression_level == nil then compression_level = 9 end; compression_level = tonumber(compression_level); if not compression_level or compression_level < 1 or compression_level > 9 then module:log("warn", "Invalid compression level in config: %s", tostring(compression_level)); module:log("warn", "Module loading aborted. Compression won't be available."); return; end module:add_event_hook("stream-features", function (session, features) if not session.compressed then -- FIXME only advertise compression support when TLS layer has no compression enabled features:add_child(compression_stream_feature); end end ); -- TODO Support compression on S2S level too. module:add_handler({"c2s_unauthed", "c2s"}, "compress", xmlns_compression_protocol, function(session, stanza) -- fail if we are already compressed if session.compressed then local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method"); session.send(error_st); session:log("warn", "Tried to establish another compression layer."); end -- checking if the compression method is supported local method = stanza:child_with_name("method")[1]; if method == "zlib" then session.log("info", method.." compression selected."); session.send(st.stanza("compressed", {xmlns=xmlns_compression_protocol})); session:reset_stream(); -- create deflate and inflate streams local status, deflate_stream = pcall(zlib.deflate, compression_level); if status == false then local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed"); session.send(error_st); session:log("error", "Failed to create zlib.deflate filter."); module:log("error", deflate_stream); return end local status, inflate_stream = pcall(zlib.inflate); if status == false then local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed"); session.send(error_st); session:log("error", "Failed to create zlib.deflate filter."); module:log("error", inflate_stream); return end -- setup compression for session.w local old_send = session.send; session.send = function(t) local status, compressed, eof = pcall(deflate_stream, tostring(t), 'sync'); if status == false then session:close({ condition = "undefined-condition"; text = compressed; extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed"); }); module:log("warn", compressed); return; end old_send(compressed); end; -- setup decompression for session.data local function setup_decompression(session) local old_data = session.data session.data = function(conn, data) local status, decompressed, eof = pcall(inflate_stream, data); if status == false then session:close({ condition = "undefined-condition"; text = decompressed; extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed"); }); module:log("warn", decompressed); return; end old_data(conn, decompressed); end; end setup_decompression(session); local session_reset_stream = session.reset_stream; session.reset_stream = function(session) session_reset_stream(session); setup_decompression(session); return true; end; session.compressed = true; else session.log("info", method.." compression selected. But we don't support it."); local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method"); session.send(error_st); end end );