code
Here is my code:
defmodule Server do
def listen_for_con(ip_addr) do
case :gen_tcp.listen(8000, [:binary, active: false, reuseaddr: true, ip: ip_addr]) do
{:ok, server} -> IO.puts "Server is listening"
{:error, reason} -> IO.puts "Error in :gen_tcp.listen: #{reason}"
end
end
end
Server.listen_for_con("example_ip_addr")
Here is the error that I get when I try to run the code:
(exit) :badarg
(kernel 7.2) inet_tcp.erl:160: :inet_tcp.listen/2
server2.exs:3: Server.listen_and_accept/1
(elixir 1.11.2) lib/code.ex:931: Code.require_file/2
I do not know what is wrong with the arguments I am giving to the function.
It is a script and I run it as follows: elixir server.exs
Thanks in advance guys.
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voltone
You need to specify the IP address as a 4- or 6-tuple, e.g.
{127, 0, 0, 1}.You can use inet:parse_address/1 to parse a human-readable address, just note that this is an Erlang API so it expects a charlist, e.g.
:inet.parse_address('127.0.0.1').code
Thanks man, I tried to find out more about the erlang inet api but all I found was a page in the docs that losted all the functions names, do you mind recommending a resource that provides more info about the api ?
voltone
The official documentation is in the
inetreference manual you found, and a small section of thekerneluser guide. There’s also a chapter on sockets in the LYSE book, which may help you get started.Both of these assume familiarity with Erlang syntax, which is often the case when you get to such lower-level APIs. There may be some Elixir-oriented blog posts out there, I don’t know…