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require 'net/http' | |
require 'socket' | |
# to run on Ubuntu/Debian with sudo access | |
def with_unresponsive_dns | |
fake_dns_ip = "127.0.0.1" | |
th = Thread.new do | |
server = UDPSocket.new | |
server.bind(fake_dns_ip, 53) | |
server.recvfrom(16) | |
sleep | |
end | |
original_dns = %x(cat /etc/resolv.conf |grep -i '^nameserver'|head -n1|cut -d ' ' -f2).strip | |
`echo "$(sed 's/#{original_dns}/#{fake_dns_ip}/g' /etc/resolv.conf)" > /etc/resolv.conf` | |
yield | |
ensure | |
`echo "$(sed 's/#{fake_dns_ip}/#{original_dns}/g' /etc/resolv.conf)" > /etc/resolv.conf` | |
th.kill | |
th.join | |
end | |
now = Time.now | |
begin | |
with_unresponsive_dns do | |
uri = URI('http://example.com/some_path?query=string') | |
puts "Started getaddrinfo. This should timeout after 1s" | |
Timeout.timeout(1) do | |
Socket.getaddrinfo("www.ruby-lang.org", "http") | |
end | |
end | |
ensure | |
puts "elapsed: #{Time.now - now}" | |
end |
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