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defmodule SNet.Addr do
@moduledoc"""
Helper module for getting our IP addresses.
Runs an agent that gets our public IPv4 address on the internet and stores it.
"""
use Agent
require Logger
def start_link(_) do
Agent.start_link(__MODULE__, :init, [], name: __MODULE__)
end
def init() do
Application.ensure_all_started(:inets)
Application.ensure_all_started(:ssl)
case :httpc.request('http://api.ipify.org') do
{:ok, {_, _, body}} ->
{:ok, addr} = :inet.parse_address body
Logger.info "Public IP address: #{body}"
[addr]
_ ->
Logger.info "Could not get public IP address"
[]
end
end
@doc"""
Reteurn the list of IPv4 address for our network interfaces.
"""
def get_if_inet4 do
{:ok, ifs} = :inet.getifaddrs
for {_, opts} <- ifs,
{:addr, addr} <- opts,
tuple_size(addr) == 4,
addr != {127,0,0,1}
do
addr
end
end
@doc"""
Return our public IPv4 address as observed by an external API provider (`ipify.org`)
"""
def get_pub_inet4 do
Agent.get(__MODULE__, &(&1))
end
@doc"""
Get all our IPv4 addresses.
"""
def get_all_inet4 do
addrset = for x <- get_if_inet4() ++ get_pub_inet4(), into: %MapSet{}, do: x
MapSet.to_list addrset
end
@doc"""
Determines if an IP address is ours or not.
"""
def is_local?({:inet, ip, port}) do
port == Application.get_env(:shard, :port) and (ip == {127,0,0,1} or ip in get_all_inet4())
end
end
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