stdlib_libraries/address_lookups_no_parens.rb

tests/_examples/stdlib_libraries/address_lookups_no_parens.rb in the metorex repository.

# A lookup answers the addresses in the order the resolver gives them, one
# for each kind of socket the resolver pairs with each address, and reads an
# empty host as the address that means every one.
require "socket"

ordered = Socket.getaddrinfo("localhost", 80, nil, :STREAM).map { |entry| entry[3] }
p Addrinfo.getaddrinfo("localhost", 80, nil, :STREAM).map(&:ip_address) == ordered
p Addrinfo.tcp("localhost", 80).ip_address == ordered.first
listed = Addrinfo.getaddrinfo(nil, 80, nil, :STREAM).map(&:ip_address)
p listed == Socket.getaddrinfo(nil, 80, nil, :STREAM).map { |entry| entry[3] }

begin
  Addrinfo.getaddrinfo("", 80, :INET6, :STREAM)
rescue Socket::ResolutionError => error
  p error.class
end
p Addrinfo.getaddrinfo("", 80, :INET, :STREAM)
p Addrinfo.getaddrinfo("<any>", 80, :INET, :STREAM)
p Addrinfo.getaddrinfo(nil, 80, :INET, :STREAM, nil, Socket::AI_PASSIVE)

p Addrinfo.getaddrinfo("127.0.0.1", 80)
p Addrinfo.getaddrinfo("::1", nil, nil, :DGRAM)
p Addrinfo.tcp("127.0.0.1", "http")
p Addrinfo.getaddrinfo("localhost", "http", :INET, :STREAM).map(&:inspect).uniq

p Addrinfo.new(Socket.sockaddr_in(80, "127.0.0.1"), :INET, :RAW, 0)
p Addrinfo.new(Socket.sockaddr_in(80, "127.0.0.1"), :INET, :STREAM, Socket::IPPROTO_UDP)
p Addrinfo.new(Socket.sockaddr_in(80, "127.0.0.1"), :INET, :RAW, Socket::IPPROTO_TCP)

Output:

true
true
true
Socket::ResolutionError
[#<Addrinfo: 0.0.0.0:80 TCP ()>]
[#<Addrinfo: 0.0.0.0:80 TCP (<any>)>]
[#<Addrinfo: 0.0.0.0:80 TCP>]
[#<Addrinfo: 127.0.0.1:80 TCP>, #<Addrinfo: 127.0.0.1:80 UDP>, #<Addrinfo: 127.0.0.1:80 SOCK_RAW>]
[#<Addrinfo: ::1 UDP>]
#<Addrinfo: 127.0.0.1:80 TCP (:http)>
["#<Addrinfo: 127.0.0.1:80 TCP (localhost:http)>"]
#<Addrinfo: 127.0.0.1:80 SOCK_RAW>
#<Addrinfo: 127.0.0.1:80 SOCK_STREAM IPPROTO_UDP>
#<Addrinfo: 127.0.0.1:80 SOCK_RAW IPPROTO_TCP>