Intellij-elixir: comeonin / bcrypt call fails only when debugging

[SyedWasiHaider]

Hello

I'm trying to debug a simple Phoenix app. I'm at the point where I'm just creating a simple user login API and using comeonin for the hashing. Interestingly, when I run mix phx.server from the terminal, I can run everything just fine. However, when I debug using the intellij plugin (which despite the issues is still wonderful and amazing by the way), I get this:

ErlangError at POST /api/users
Erlang error: :not_loaded
nofile
No code available.
:erlang.nif_error/1
Called with 1 arguments

    :not_loaded

Elixir.Comeonin.Bcrypt.erl

137  @doc """
138  Initialize the P-box and S-box tables with the digits of Pi,
139  and then start the key expansion process.
140  """
141  def bf_init(key, key_len, salt)
142  def bf_init(_, _, _), do: :erlang.nif_error(:not_loaded)
143
144  @doc """
145  The main key expansion function. This function is called
146  2^log_rounds times.
147  """

Comeonin.Bcrypt.bf_init/3 docs comeonin
Elixir.Comeonin.Bcrypt.erl

161  end
162
163  defp bcrypt(key, salt, prefix, log_rounds) when prefix in ['2b', '2a'] do
164    key_len = if prefix == '2b' and length(key) > 72, do: 73, else: length(key) + 1
165    {salt, rounds} = prepare_keys(salt, List.to_integer(log_rounds))
166    bf_init(key, key_len, salt)
167    |> expand_keys(key, key_len, salt, rounds)
168    |> bf_encrypt
169  end

I've already tried setting this environment variable:

INTELLIJ_ELIXIR_DEBUG_BLACKLIST=Elixir.Bcrypt.Base,Elixir.Bcrypt.Stats,Elixir.Bcrypt,bcrypt_elixir,iconv,comeonin

but I wasn't sure if that was what was causing issue.

The specific function call is Comeonin.Bcrypt.hashpwsalt(password)

Version Info:

Erlang/OTP 20 [erts-9.1] [source] [64-bit] [smp:1:1] [ds:1:1:10] [async-threads:10] [hipe] [kernel-poll:false]
Elixir 1.5.1
OS: Lubunu 17.04

I'm new to Elixir/Erlang so any help is appreciated.

Thanks

[KronicDeth]

Is the repo public, so I can fork it and use it as a test case?

[JakeBecker]

It'd be great if there were a way to detect which modules have NIFs so we can avoid auto-intepreting them, but unfortunately, I'm not aware of any way to do that.

[KronicDeth]

If NIFs work the way C extensions do in other languages, there will be a trampoline in the .beam that gets rewritten to a direct call to the C once the VM can see the .so or .dll. I bet there's some way to figure that out when decompiling the .beam.

[asurin]

Just wanted to say I have the same issue with comeonin/bcrypt and IntelliJ-Elixir.

@KronicDeth If you want to repro you can use the "Programming Phoenix" example app: https://github.com/terakilobyte/rumbl

Putting a debug point on this line: https://github.com/terakilobyte/rumbl/blob/master/web/models/user.ex#L34 and then trying to sign up will trigger this error (I also get it in my own application on any file that calls the same comeonin function)