Runtime configuration?

[mindreader]

I want to use hammer via redis, but if I configure it as in the docs, I have to specify my redis host and password at compile time, which I absolutely don't want to do.

What I ended up having to do was, to prevent hammer from starting itself.

{:hammer, "~> 6.0.0", runtime: false},
{:hammer_plug, "~> 2.1", runtime: false},
{:hammer_backend_redis, "~> 6.1", runtime: false}

Add a dummy config so that when it picks a pool, it knows what its name will be.

config :hammer,
  backend: {Hammer.Backend.Redis, nil}

Add it manually to my supervision tree at runtime with the config of my choice

defmodule MyApp.Hammer do
  def child_spec do                                                                            
    %{                                                                                         
      id: Hammer.Supervisor,                                                                   
      start:
        {Hammer.Supervisor, :start_link,                                                       
         [                                                                                     
           {Hammer.Backend.Redis,                                                              
            [
              expiry_ms: 60_000,                                                               
              redix_config: [                                                                  
                host: System.get_env("REDIS_HOST") || raise("env var REDIS_HOST required"),    
                password: System.get_env("REDIS_PASS") || raise("env var REDIS_PASS required") 
              ]
            ]},
           [name: Hammer.Supervisor]                                                           
         ]}
    } 
  end                                                                                          
end

defmodule MyApp.Supervisor do
  def init(_args) do
    processes = [
       ...
       MyApp.Hammer
    ]  |> Supervisor.init(...)
  end
end

Is there an easier way of doing what I just did?

[mindreader]

This setup technically works but I ran into some problems with releases, so I went ahead and submitted a pr with the ability to specify runtime config instead. Hopefully that works better for people.

[epinault]

@mindreader what PR did you create?

[mindreader]

I think the pr was accepted a long long time ago, but this was never closed.