Phoenix Application
Sharolyn Uriegas
Sure, we can let people discover this over time. But if we do that, and if people start running into the same problems with Phoenix that drove them away from Rails, what have we gained? People will just move on to the next big thing.
Btw, so far everything you have said in your course like this (microservices, single responsibility functions/modules etc) makes SO much sense to me - so much so that I am actually bursting with excitement and dying for everyone else to do your course and learn these amazing things as well!! THANK YOU DAVE
Phoenix 1.3 encourages the logical separation of your web concerns and your business concerns, with the data layer being lumped in with the business logic. Is the idea to pull that apart further into three separate pieces: [web, business, data] instead of [web, business, data]? So that inside of a Foo context, Foo.get_all_things() contains something like DataLayer.get_all_things() instead of Thing > Repo.all(), where DataLayer is referencing a separate service, whether that be in another child of the main supervision tree or a completely separate otp application?
If I were writing an application that had services, but I included those services in one of the endpoint API modules, that would generally be considered to be a bad design. Why, for example, would a user creation service be part of my web API module when I would also use it from my command line and from my batch processing?
In that sense, the phoenix/mix edges of your application are essentially just i/o adapters that are translating inputs/ouputs from somewhere (http, stdin) into calls to the functional api that lives inside of the contexts. If you maintain strict segregation between your contexts and the i/o layers (which I think 1.3 encourages), then your application remains decoupled from phoenix.
It is really hard to agree that Phoenix v1.3 became more coupled to the database compared to previous versions. It has gone from an application that accessed the database in your controllers, channels and models to one that puts this access behind isolated modules with discrete APIs. Removing the database access in a Phoenix v1.3 app should require localized changes to your lib/app instead of rewriting most of your web layer.
It also puzzles me when someone says contexts are wrong because contexts are literally modules. You can disagree with the placement of those modules (in the same application instead of separate ones) but using modules to define our APIs is pretty much our bread and butter. This is supported by the fact you can now generate the web code that access any module and then just fill in the blanks. The blanks can be filled with a module in the same or in a separate application. Or even with a module that does not reach the database at all.
We can run mix phx.new from any directory in order to bootstrap our Phoenix application. Phoenix will accept either an absolute or relative path for the directory of our new project. Assuming that the name of our application is hello, let's run the following command:
Phoenix promotes the usage of git as version control software: among the generated files we find a .gitignore. We can git init our repository, and immediately add and commit all that hasn't been marked ignored.
Phoenix assumes that our PostgreSQL database will have a postgres user account with the correct permissions and a password of "postgres". If that isn't the case, please see the Mix Tasks Guide to learn more about the mix ecto.create task.
If your screen looks like the image above, congratulations! You now have a working Phoenix application. In case you can't see the page above, try accessing it via :4000 and later make sure your OS has defined "localhost" as "127.0.0.1".
Alternatively, you can continue reading these guides to have a quick introduction into all the parts that make your Phoenix application. If that's the case, you can read the guides in any order or start with our guide that explains the Phoenix directory structure.
In my Traefik setup I put the https and cert management completely on the shoulders of Traefik. The phoenix app just continues to listen on 4000 via the docker port mapping. The only unusual change on the Phoenix side was that in runtime.exs I do:
In the blog post that you cited, he was using nginx in single thread and caddy in multi-thread. Also it is a synthetic benchmark that has very little processing on the proxyed application server. Single thread Nginx is a valid config for real world workloads because you want to leave as much as possible cpu to the application server that does the heavy lifting.
this creates versions but that version doesn't work with hot code upgrades and messes up the relup file. When I do versioning like 1.0.1, 1.0.2 and 1.0.3. then hot code deploys works fine. but Is there any way to make this thing dynamic?
I am using distillery for deployment but the auto versions are not working unless they are 1.0.1 or 1.0.2 or 1.0.3. I have tried the answer below. as well as git describe --tags as well. but distillery only uses 2 versions then each time using the past version to create new release.
Here is the approach I use for an application that eventually get build as a versioned production RPM. When built against a clean tag, the version is the tab name. Otherwise, the version includes the short commit hash and the commit count since the last tag.
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