clearing chrome dns cache and sockets via js

flush_chrome_dns.sh

#!/bin/bash
#
# The MIT License (MIT)

# Copyright (c) 2015 Justin Shattuck <shat@f5.com>, F5 Networks, Inc.

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# THE SOFTWARE.

echo ""
echo "Dumping Google Chrome DNS Cache"
osascript <<EOD
	tell application "Google Chrome"
		tell front window
			set origTab to active tab
			set origTabIndex to active tab index
			set theTab to make new tab with properties {URL:"chrome://net-internals/#dns"}
			set isLoadDone to not loading of theTab
			repeat until isLoadDone
				set isLoadDone to not loading of theTab
			end repeat
			delay 1
			execute theTab javascript "g_browser.sendFlushSocketPools();g_browser.checkForUpdatedInfo(false);g_browser.sendClearHostResolverCache();"
			close theTab
			set active tab index to origTabIndex
			-- uncomment the line below (remove -- ) if you would like previously opened tab to be reloaded.
			-- reload origTab
		end tell
	end tell
EOD

echo "Finished dumping Google Chrome DNS Cache"

Use

Someone asked if it was possible to dump/flush the local dns cache within the browser using Javascript. This is one way to do it, using bash to execute applescript, but it requires the user (a) be using an Apple and (b) they are using Google Chrome. I've adopted this to FireFox as well and will release, but for now this should work.

$ chmod +x /path/to/flush_chrome_dns.sh
$ /path/to/flush_chrome_dns.sh

Next steps, which are done, but I will create a repository that has this as an application that supports numerous browsers, has command line interface as well as a .app which could be used from Alfred workflow etc. Simple enough.

when i use this i got
Uncaught ReferenceError: g_browser is not defined at <anonymous>:1:17