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warning: function Poison.encode/1 is undefined (module Poison is not available)
  lib/ex_syslogger/json_formatter.ex:53

Generated ex_syslogger app

20:17:25.790 [error] CRASH REPORT Process <0.10004.0> with 0 neighbours exited with reason: {'EXIT',{#{'__exception__' => true,'__struct__' => 'Elixir.Protocol.UndefinedError',description => <<>>,protocol => 'Elixir.Enumerable',value => all},[{'Elixir.Enumerable','impl_for!',1,[{file,"/Users/jose/OSS/elixir/lib/elixir/lib/enum.ex"},{line,1}]},{'Elixir.Enumerable','member?',2,[{file,"/Users/jose/OSS/elixir/lib/elixir/lib/enum.ex"},{line,166}]},{'Elixir.Enum','member?',2,[{file,"lib/enum.ex"},{line,1553}]},{'Elixir.Keyword','-take/2-lists^filter/1-0-',2,[{file,"lib/keyword.ex"},{line,...}]},...]}} in gen_server:handle_common_reply/8 line 751
20:17:25.790 [error] Supervisor 'Elixir.Logger.BackendSupervisor' had child {'Elixir.ExSyslogger',ex_syslogger} started with 'Elixir.Logger.Watcher':start_link({'Elixir.Logger',{'Elixir.ExSyslogger',ex_syslogger},{'Elixir.ExSyslogger',ex_syslogger}}) at <0.10004.0> exit with reason {'EXIT',{#{'__exception__' => true,'__struct__' => 'Elixir.Protocol.UndefinedError',description => <<>>,protocol => 'Elixir.Enumerable',value => all},[{'Elixir.Enumerable','impl_for!',1,[{file,"/Users/jose/OSS/elixir/lib/elixir/lib/enum.ex"},{line,1}]},{'Elixir.Enumerable','member?',2,[{file,"/Users/jose/OSS/elixir/lib/elixir/lib/enum.ex"},{line,166}]},{'Elixir.Enum','member?',2,[{file,"lib/enum.ex"},{line,1553}]},{'Elixir.Keyword','-take/2-lists^filter/1-0-',2,[{file,"lib/keyword.ex"},{line,...}]},...]}} in context child_terminated
:gen_event handler {ExSyslogger, :ex_syslogger} installed in Logger terminating
** (exit) an exception was raised:
    ** (Protocol.UndefinedError) protocol Enumerable not implemented for :all. This protocol is implemented for: Ecto.Adapters.SQL.Stream, Postgrex.Stream, DBConnection.PrepareStream, DBConnection.Stream, Timex.Interval, Date.Range, File.Stream, Function, GenEvent.Stream, HashDict, HashSet, IO.Stream, List, Map, MapSet, Range, Stream
        (elixir) /Users/jose/OSS/elixir/lib/elixir/lib/enum.ex:1: Enumerable.impl_for!/1
        (elixir) /Users/jose/OSS/elixir/lib/elixir/lib/enum.ex:166: Enumerable.member?/2
        (elixir) lib/enum.ex:1553: Enum.member?/2
        (elixir) lib/keyword.ex:927: Keyword."-take/2-lists^filter/1-0-"/2
        (ex_syslogger) lib/ex_syslogger.ex:268: ExSyslogger.format_event/5
        (ex_syslogger) lib/ex_syslogger.ex:215: ExSyslogger.handle_event/2
        (stdlib) gen_event.erl:577: :gen_event.server_update/4
        (stdlib) gen_event.erl:559: :gen_event.server_notify/4
        (stdlib) gen_event.erl:300: :gen_event.handle_msg/6
        (stdlib) proc_lib.erl:249: :proc_lib.init_p_do_apply/3

==> ex_syslogger
Compiling 2 files (.ex)
warning: use GenEvent is deprecated, use one of the alternatives described in the documentation for the GenEvent module
  lib/ex_syslogger.ex:150

warning: the GenEvent module is deprecated, see its documentation for alternatives
  lib/ex_syslogger.ex:150

warning: String.to_char_list/1 is deprecated, use String.to_charlist/1
  lib/ex_syslogger.ex:226
...

Generated ex_syslogger app

➜  mix compile
===> Fetching pc v1.12.0
=WARNING REPORT==== 14-May-2021::15:55:53.612552 ===
Description: "Authenticity is not established by certificate path validation"
     Reason: "Option {verify, verify_peer} and cacertfile/cacerts is missing"

===> Analyzing applications...
===> Compiling pc
===> Analyzing applications...
===> Compiling syslog
===> Compiling c_src/syslog_drv.c
===> Linking priv/syslog_drv.so
===> Missing artifact priv/syslog_drv.so
** (Mix) Could not compile dependency :syslog, "/home/alex/.mix/rebar3 bare compile --paths /home/alex/Projects/soapbox/_build/dev/lib/*/ebin" command failed. You can recompile this dependency with "mix deps.compile syslog", update it with "mix deps.update syslog" or clean it with "mix deps.clean syslog"

2017-07-16 00:37:17.081 [error] nonode@nohost module=Logger.Watcher line=99 function=handle_info/2  :gen_event handler {ExSyslogger, :ex_syslogger_json} installed at Logger
** (exit) an exception was raised:
    ** (UndefinedFunctionError) function Poison.encode/1 is undefined (module Poison is not available)
        Poison.encode(%{level: :error, message: "GenServer #PID<0.170.0> terminating\n** (stop) {:EXIT, {:undef, [{Poison, :encode, [%{level: :error, message: \"GenEvent handler {ExSyslogger, :ex_syslogger_json} installed in Logger terminating\\n** (UndefinedFunctionError) function Poison.encode/1 is undefined (module Poison is not available)\\n    Poison.encode(%{level: :error, message: \\\"GenServer #PID<0.168.0> terminating\\\\n** (stop) {:EXIT, {:undef, [{Poison, :encode, [%{level: :error, message: \\\\\\\"GenEvent handler {ExSyslogger, :ex_syslogger_json} installed in Logger terminating\\\\\\\\n** (UndefinedFunctionError) function Poison.encode/1 is undefined (module Poison is not available)\\\\\\\\n

% ./test_syslogger 
sh: line 1: exec: syslog_drv: not found

09:43:11.563 [info]  Just a test 2

defmodule TestSyslogger.MixProject do
  use Mix.Project

  def project do
    [
      app: :test_syslogger,
      version: "0.1.0",
      elixir: "~> 1.9",
      start_permanent: Mix.env() == :prod,
      deps: deps(),
      escript: [main_module: Simple] # Syslogging no longer works if built as a escript "sh: 1: exec: syslog_drv: not found"
    ]
  end

  def application do
    [
      extra_applications: [:logger]
    ]
  end

  defp deps do
    [
      {:ex_syslogger, "~> 2.0.0"} # https://hexdocs.pm/ex_syslogger/ https://github.com/slashmili/ex_syslogger
    ]
  end
end

  def main(_argv) do
    require Logger

    Logger.configure([level: :debug])
    Logger.add_backend({ExSyslogger, :default_logger})
    #Logger.configure_backend({ExSyslogger, :default_logger}, [])
    Logger.info("Just a test 2")
  end
end

Simple.main([])

% mix run simple.exs 
===> Fetching pc v1.14.0
===> Analyzing applications...
===> Compiling pc
===> Analyzing applications...
===> Compiling syslog
===> Compiling c_src/syslog_drv.c
===> Linking /home/stephane/Programmation/Elixir/essais/test_syslogger/_build/dev/lib/syslog/priv/syslog_drv.so
==> ex_syslogger
Compiling 2 files (.ex)
Generated ex_syslogger app
==> test_syslogger
Compiling 1 file (.ex)
Generated test_syslogger app

% elixir --version
Erlang/OTP 24 [erts-12.3] [source] [64-bit] [smp:1:1] [ds:1:1:10] [async-threads:1] [jit]

Elixir 1.13.2 (compiled with Erlang/OTP 24)

iex> Logger.configure_backend {ExSyslogger, :my_syslog}, level: :info

    {:ok, log} = if config.facility !== new_config.facility or
       config.ident !== new_config.ident or
       config.option !== new_config.option do

        close_log(log)
        open_log(new_config)
    end

===> Compiling syslog
==> ex_syslogger
Compiling 2 files (.ex)

{:ex_syslogger, "~> 1.3"},
{:syslog, git: "https://github.com/Vagabond/erlang-syslog.git", tag: "1.0.5", override: true}

===> Fetching pc ({git,"git://github.com/blt/port_compiler.git",{tag,"1.6.0"}})
===> Compiling pc
===> Compiling syslog
===> Compiling c_src/syslog_drv.c
===> Linking priv/syslog_drv.so
==> ex_syslogger
Compiling 2 files (.ex)