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tools/cfgdump.lua @ 11665:148075532021
net.server_epoll: Prevent stack overflow of opportunistic writes
net.http.files serving a big enough file on a fast enough connection
with opportunistic_writes enabled could trigger a stack overflow through
repeatedly serving more data that immediately gets sent, draining the
buffer and triggering more data to be sent. This also blocked the server
on a single task until completion or an error.
This change prevents nested opportunistic writes, which should prevent
the stack overflow, at the cost of reduced download speed, but this is
unlikely to be noticeable outside of Gbit networks. Speed at the cost of
blocking other processing is not worth it, especially with the risk of
stack overflow.
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Sun, 11 Jul 2021 09:39:21 +0200 |
parent | 11570:c3896c714a83 |
child | 13142:879a6a33c21b |
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#!/usr/bin/env lua -- cfgdump.lua prosody.cfg.lua [[host] option] local s_format, print = string.format, print; local printf = function(fmt, ...) return print(s_format(fmt, ...)); end local it = require "util.iterators"; local function sort_anything(a, b) local typeof_a, typeof_b = type(a), type(b); if typeof_a ~= typeof_b then return typeof_a < typeof_b end return a < b -- should work for everything in a config file end local serialization = require "util.serialization"; local serialize = serialization.new and serialization.new({ unquoted = true, table_iterator = function(t) return it.sorted_pairs(t, sort_anything); end, }) or serialization.serialize; local configmanager = require"core.configmanager"; local startup = require "util.startup"; startup.set_function_metatable(); local config_filename, onlyhost, onlyoption = ...; local ok, _, err = configmanager.load(config_filename or "./prosody.cfg.lua", "lua"); assert(ok, err); if onlyhost then if not onlyoption then onlyhost, onlyoption = "*", onlyhost; end if onlyhost ~= "*" then local component_module = configmanager.get(onlyhost, "component_module"); if component_module == "component" then printf("Component %q", onlyhost); elseif component_module then printf("Component %q %q", onlyhost, component_module); else printf("VirtualHost %q", onlyhost); end end printf("%s = %s", onlyoption or "?", serialize(configmanager.get(onlyhost, onlyoption))); return; end local config = configmanager.getconfig(); for host, hostcfg in it.sorted_pairs(config) do local fixed = {}; for option, value in it.sorted_pairs(hostcfg) do fixed[option] = value; if option:match("ports?$") or option:match("interfaces?$") then if option:match("s$") then if type(value) ~= "table" then fixed[option] = { value }; end else if type(value) == "table" and #value > 1 then fixed[option] = nil; fixed[option.."s"] = value; end end end end config[host] = fixed; end local globals = config["*"]; config["*"] = nil; local function printsection(section) local out, n = {}, 1; for k,v in it.sorted_pairs(section) do out[n], n = s_format("%s = %s", k, serialize(v)), n + 1; end table.sort(out); print(table.concat(out, "\n")); end print("-------------- Prosody Exported Configuration File -------------"); print(); print("------------------------ Global section ------------------------"); print(); printsection(globals); print(); local has_components = nil; print("------------------------ Virtual hosts -------------------------"); for host, hostcfg in it.sorted_pairs(config) do setmetatable(hostcfg, nil); hostcfg.defined = nil; if hostcfg.component_module == nil then print(); printf("VirtualHost %q", host); printsection(hostcfg); else has_components = true end end print(); if has_components then print("------------------------- Components ---------------------------"); for host, hostcfg in it.sorted_pairs(config) do local component_module = hostcfg.component_module; hostcfg.component_module = nil; if component_module then print(); if component_module == "component" then printf("Component %q", host); else printf("Component %q %q", host, component_module); hostcfg.component_module = nil; hostcfg.load_global_modules = nil; end printsection(hostcfg); end end end print() print("------------------------- End of File --------------------------");