Has anybody testing khepri with elixir?

[batok]

Hi, I have tried to use khepri as shown in README.md , but having errors from a mix project and from a script using Mix.install/1

[lukebakken]

@batok please provide a repository that I can clone that demonstrates what you have tried.

[batok]

Mix.install([{:khepri, "0.1.1"}])
:khepri.start()

elixir script.exs

[batok]

elixir script.exs 2>error
cat error
could not compile dependency :khepri, "mix compile" failed. Errors may have been logged above. You can recompile this dependency with "mix deps.compile khepri", update it with "mix deps.update khepri" or clean it with "mix deps.clean khepri"
** (Mix.NoProjectError) Could not find a Mix.Project, please ensure you are running Mix in a directory with a mix.exs file
    (mix 1.13.1) lib/mix/project.ex:204: Mix.Project.get!/0
    (mix 1.13.1) lib/mix/tasks/compile.ex:122: Mix.Tasks.Compile.run/1
    (mix 1.13.1) lib/mix/task.ex:397: anonymous fn/3 in Mix.Task.run_task/3
    (mix 1.13.1) lib/mix/tasks/deps.compile.ex:176: anonymous fn/2 in Mix.Tasks.Deps.Compile.do_mix/2
    (mix 1.13.1) lib/mix/project.ex:396: Mix.Project.in_project/4
    (elixir 1.13.1) lib/file.ex:1560: File.cd!/2
    (mix 1.13.1) lib/mix/dep.ex:268: Mix.Dep.in_dependency/3
    (mix 1.13.1) lib/mix/tasks/deps.compile.ex:89: anonymous fn/4 in Mix.Tasks.Deps.Compile.compile/2

[batok]

Above error is also displayed from a simple mix project like:

mix new foo
cd foo
sed "s/\# {:dep_from_hexpm, \"~> 0.3.0\"}/{:khepri, \"0.1.1\"}/g" mix.exs > other.exs
rm mix.exs
mv other.exs mix.exs
mix deps.get
mix compile 2>error
cat error
could not compile dependency :khepri, "mix compile" failed. Errors may have been logged above. You can recompile this dependency with "mix deps.compile khepri", update it with "mix deps.update khepri" or clean it with "mix deps.clean khepri"
** (Mix) Could not find a Mix.Project, please ensure you are running Mix in a directory with a mix.exs file

[dch]

FWIW I see this here also,

$ mix new pyramid && cd pyramid
## add {:khepri, "~> 0.1"} dependency
$ mix do deps.get --all, deps.compile, compile
Resolving Hex dependencies...
Dependency resolution completed:
New:
  aten 0.5.7
  gen_batch_server 0.8.6
  khepri 0.1.1
  proper 1.4.0
  ra 2.0.2
* Getting khepri (Hex package)
* Getting proper (Hex package)
* Getting ra (Hex package)
* Getting aten (Hex package)
* Getting gen_batch_server (Hex package)
===> Fetching covertool v2.0.4
===> Analyzing applications...
===> Compiling covertool
===> Analyzing applications...
===> Compiling proper
===> Analyzing applications...
===> Compiling gen_batch_server
===> Analyzing applications...
===> Compiling aten
===> Analyzing applications...
===> Compiling ra
==> khepri
could not compile dependency :khepri, "mix compile" failed. Errors may have been logged above. You can recompile this dependency with "mix deps.compile khepri", update it with "mix deps.update khepri" or clean it with "mix deps.clean khepri"

• FreeBSD of course
• Elixir 1.13.1
• OTP 24.1.7

the mix-fetched khepri compiles just fine outside mix with rebar3, still digging into deps.compile to see how it decides between rebar/rebar3 etc.

[lukebakken]

The issue is that khepri is published to hex source-only, but does not include a mix.exs file for compiling it. So, when it's a dependency of an elixir project, mix doesn't know how to build it. You can see what kind of project mix detects it as here:

C:\Users\bakkenl\development\lukebakken\khepri_test [main +0 ~2 -0 !]> mix deps
* aten 0.5.7 (Hex package) (rebar3)
  locked at 0.5.7 (aten) 8b623c8b
  ok
* gen_batch_server 0.8.6 (Hex package) (rebar3)
  locked at 0.8.6 (gen_batch_server) b7867934
  ok
* khepri (Hex package) (mix)
  locked at 0.1.1 (khepri) a1d2b605
  the dependency build is outdated, please run "mix deps.compile"
* proper 1.4.0 (Hex package) (rebar3)
  locked at 1.4.0 (proper) 18285842
  ok
* ra 2.0.2 (Hex package) (rebar3)
  locked at 2.0.2 (ra) 88516b32
  ok

The workaround is to use the :manager configuration option as you can see here:

https://github.com/lukebakken/khepri_test/blob/main/mix.exs#L24

We'll fix this issue by including a mix.exs file.

I tested my project using Erlang 24.2, Elixir 1.13.1 on Windows 10

[batok]

Thanks!

[dch]

As there's a mix.exs already available in src, just use {:khepri, github: "rabbitmq/khepri"} as your dependency & this also works fine as an interim solution. I was not aware of the manager key in mix - thanks @lukebakken !

[batok]

# requires at least elixir 1.12
#Mix.install([{:khepri, "~> 0.1", manager: :rebar3}])
Mix.install([{:khepri, github: "rabbitmq/khepri"}])
defmodule Main do
  def start() do
    :khepri.start()
    val = :khepri.insert([:emails, :me], "[email protected]")
    IO.puts "after insert"
    inspect val 
    val = :khepri.get([:emails, :me])
    IO.puts "after get"
    inspect val
  end
end
Main.start()

If you save this to script.exs and run elixir script.exs you'll see it works initializing stuff but has to return values from khepri:get/1 and khepri:insert/2

[batok]

Forget about ^^ :) it works. Forgot to use IO.inspect instead of inspect alone.