Ace: HTTP/2 webserver

Crowdhailer

Creator of Raxx

The latest release of Ace (0.10.0) includes serving content over HTTP/2.

I have started writing a webserver to teach my self more about webservers. Ace

The easiest thing is to probably summarize the plan here and if you want more details head on over to the README.

To take this obviously deficient TCP echo server that I wrote as a beginner elixir developer and create a fully fledged HTTP server.
Keep reasonable notes of progress so others can learn about how to build a web server in elixir.
See what progress I have made in a year as an elixir developer.

Currently I have an issue which is confusing me (yes even at this beginner stage).
When I restart the server it often fails because the port is currently in use.
I call gen_tcp.close and am unsure why there is a delay in the port being properly closed?
Give the computer a few moments and the port does eventually become available again.

I know this is probably a help question but I didn’t want to post about my project twice and there are more things coming this way soon

32 comments

#erlang #web-frameworks #library #ace

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2020-02-16 09:11:36 UTC

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OvermindDL1

Hmm, I’ve not experienced that and am not in a short set of tests here. Can you give a reproducable iex or so session or a github repo with a test that demonstrates this? I’m quite curious as this sounds like it is not operating as it should…

Post #1

Crowdhailer

Creator of Raxx

Hi.

What do you mean by reproducible iex session? just the list of commands that I entered that you can manually repeat?

I will also have a look at setting up a test.

Post #2

OvermindDL1

Yep, quickest way to test, or a full git test that we can clone works too.

Post #3

mkunikow

So this will be some alternative to go https://caddyserver.com/ ?

Post #4

Crowdhailer

Creator of Raxx

mebe.

Actually my goal is for it to have extremely readable source. I “almost” hope this makes it slow so that people know that its for demo purposes.

Post #5

Crowdhailer

Creator of Raxx

Hi.

Thanks for the help. Quick question, Did you remember to comment out line 25 {:reuseaddr, true}. This line fixes the problem but I’m not really sure why.

The walk-through of commands after that takes two terminals.

# terminal 1
vagrant up
vagrant ssh
cd /vagrant
elixir server.ex

# terminal 2
vagrant ssh
telnet localhost 8080

# In telnet
CLOSE
# Connection closed by foreign host.

# terminal 1 
# restart server
elixir server.ex

# ** (MatchError) no match of right hand side value: {:error, :eaddrinuse}
#    server.ex:30: TCPEcho.start/1
#    (elixir) lib/code.ex:363: Code.require_file/2

# Wait a while.
elixir server.ex
# Listening on port: 8080

Post #6

Crowdhailer

Creator of Raxx

Thanks to some pointers from helpful people I now understand this issue. I have added comments to the source code explaining reuseaddr.

Post #7

Crowdhailer

Creator of Raxx

The latest release of Ace (0.10.0) includes serving content over HTTP/2.

Instructions for getting started can be found in this guide.
An example app is available here.

Features available at this point are

Stream isolation; one process per stream
Bidirectional streaming; stream data too and from clients
TLS(SSL) support via ALPN; data encrypted in transit
Raxx interface; simplicitfy for request/response interactions

Also see the Roadmap for remaining features.

An adapter for plug and therefore phoenix is not something I am looking at yet. My preference is to shore up the foundations prior to a 1.0 release. However if anyone wanted to look at this I would be happy to offer some help getting through the codebase.

Any feedback would be great. At this point I am particularly looking for comments around the API.
At this point the project is very alpha. However I hope to stabilise it quickly.

Post #8