francois1
Failed to start child: ** (EXIT) already started
I want to share a Finch app among Umbrella apps.
- In foo_app:
def start(_type, _args) do
children = [
{Finch, name: MyAppServer.Finch},
- In bar_app:
def start(_type, _args) do
children = [
{Finch, name: MyAppServer.Finch},
This leads to the error:
Application bar_app exited: BarApp.Application.start(:normal, ) returned an error: shutdown: failed to start child: MyAppServer.Finch
Is there any way to start the app only if not already available?
Other options:
-
start it only from one of the apps
=> but what if I want to start the other app (which wouldn’t start Finch) independently -
use 2 Finch instances
=> the Swoosh mailer accepts only one Finch instance -
start it in a shared app
=> ultimately possible if no other easier solution
Most Liked
benwilson512
You aren’t starting an app, you are defining an instance of Finch, monitored in your apps supervision tree, with a name. You’re explicitly starting it twice with the same name.
If you plan to use it from Swoosh and you want just one swoosh config then you should run finch in whatever app is using swoosh. If multiple apps are using swoosh then I would start two finch instances and configure each swoosh to use one.
Ultimately issues like this are why I abandoned umbrella apps. The “you might start parts of it separately” part was always theoretical, and the dependency struggles was always concrete and ever present.
benwilson512
That seems like a major deficiency in swoosh then. Most elixir apps have gone away from singleton configuration for this and other reasons.
Last Post!
francois1
In my case I have apps deployed independently. The reason I went for an Umbrella is that it is a well-documented setup for having one repo with multiple apps and shared dependencies, there is tooling provided such as running all tests from the root, run all apps at once in development, etc.
I could move away from Umbrella easily as those apps are not coupled except that they share some common files. Whether I use Umbrella or not, the alternative will result in nearly the same setup in my opinion… well, I could have configured Swoosh separately if I had totally separated apps without Umbrella.
I do not use Umbrella apps to enforce separation of concerns in code, but only to have a set of independently deployable apps that belong to one same suite of apps.
Deployment is not my forte. What I would do is simply have separate Finch instances and separate Swoosh configs, whether they are deployed on a same node or not, as it is the easiest to set up (i.e. just configure finch/swoosh for every app in the config file copy/paste:)) But again, Swoosh doesn’t allow that.
Popular in Questions
Other popular topics
Latest on Elixir Forum
Sponsor Spotlight
Producing high quality Elixir screencasts since 2017.
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #deployment
- #library
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #channels
- #elixirconf
- #exunit
- #discussion
- #code-sync
- #javascript
- #podcasts
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #elixir-ls
- #phoenix_html
- #iex
- #blog-post
- #graphql
- #genstage
- #ai
- #websockets
- #supervisor
- #elixirconf-us
- #advent-of-code
- #distillery
- #processes
- #api
- #forms
- #metaprogramming
- #security
- #hex
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Error tracking, logs, uptime, and Just Enough APM. Built for developers.
Practical resources that improve the lives of professional developers.
Producing high quality Elixir screencasts since 2017.
Enabling companies to succeed by building software people love.
The team behind Membrane, Popcorn, LiveDebugger. Available for hire.
Courses that'll move you from confusion to "Aha, now I get it!"