LiveView upload crashes when sending consume_done, channel has terminated?

bilalhassankh · June 21, 2022, 9:20am

error] GenServer #PID<0.1529.0> terminating
** (stop) exited in: GenServer.call(#PID<0.1539.0>, :consume_done, :infinity)
    ** (EXIT) no process: the process is not alive or there's no process currently associated with the given name, possibly because its application isn't started

This error is occuring at consume_uploaded_entries function

files =
      consume_uploaded_entries(socket, :image, fn %{path: path}, entry ->
        file_details = %{path: path, filename: entry.client_name}
        upload_file = AssetStore.upload_image(dir_name, file_details)

        case upload_file do
          {:ok, file_path} ->
            {:ok,
             %{
               path: file_path,
               name: entry.client_name,
               size: entry.client_size
             }}

          {:error, error} ->
            {:postpone, {:error, error}}
        end
      end)

AUGERClement · June 21, 2022, 9:27am

Dumb question, but did your supervisor started the process ?
Or can you show where you started your genserver ?

al2o3cr · June 21, 2022, 1:23pm

@bilalhassankh I’ve edited the title of this post to be more specific about (what I believe to be) the problem.

The crash you’re describing sounds like the channel process is exiting before the file upload handler finishes; that’s the only place that sends a :consume_done message:

github.com

phoenixframework/phoenix_live_view/blob/d60ca4089f7be2bc5e6976d8208db3fb2d018c73/lib/phoenix_live_view/upload_channel.ex#L26

      
        
            {:ok, file_meta} ->
              try do
                result =
                  cond do
                    is_function(func, 1) -> func.(file_meta)
                    is_function(func, 2) -> func.(file_meta, entry)
                  end
            
            
    case result do
                  {:ok, return} ->
                    GenServer.call(pid, :consume_done, @timeout)
                    return
            
            
      {:postpone, return} ->
                    return
            
            
      return ->
                    IO.warn """
                    consuming uploads requires a return signature matching:
            
            
            {:ok, value} | {:postpone, value}

Can you describe the conditions that lead up to this error? What environments does it happen in (dev / test / production)? Is it sensitive to the size of the file?

loics2 · August 31, 2022, 11:25am

I think I found the issue. Are you saving the uploaded files into priv/static/? If so, LiveView live reload will (by default and in dev mode) try to reload the page when something changes in this directory. Try changing the file destination or disabling live reload, it worked for me.