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_posts/2023-12-28-cargo-script-and-cgi.md

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+---
+permalink: "/{{ year }}/{{ month }}/{{ day }}/cargo-script-and-cgi"
+title: "cargo script and cgi"
+published_date: "2023-12-28 18:30:00 +0200"
+layout: post.liquid
+data:
+  route: blog
+excerpt: |
+  Everything old is new again.
+  These days things get deployed as Cloud Functions, Lambdas or whatever FaaS it is today.
+  But those from the old days simply stuck with CGI and that's easily possible with Rust too.
+---
+
+Everything old is new again.
+These days things get deployed as Cloud Functions, Lambdas or whatever [FaaS](https://en.wikipedia.org/wiki/Function_as_a_service) it is today.
+But those from the old days [simply stuck with CGI](https://rednafi.com/go/reminiscing_cgi_scripts/).
+
+Modern[^1] Rust is perfect for that kind of world!
+Cargo now has support for single-file packages ([RFC 3424]),
+which allows you to stuff all your code into a single `.rs` file and then run that.
+It even caches the built binary, so it's efficient enough to run on every request.
+
+I went ahead and updated the [cgi] crate ([my fork here][cgi-fork]).
+Now all it takes is this little bit of Rust code:
+
+````rust
+#!/usr/bin/env -S cargo +nightly -q -Zscript
+```cargo
+[dependencies]
+cgi = { git = "https://github.com/badboy/rust-cgi" }
+```
+
+#[cgi::main]
+fn main(_request: cgi::Request) -> cgi::Response {
+    cgi::text_response(200, "Hello World!")
+}
+````
+
+Install the [fcgiwrap] tool, follow the instructions to configure Nginx and voilà:
+<https://fnordig.de/cgi-bin/hello-world.rs>
+
+Need some state? Throw in a database and you can keep track of that too:
+<https://fnordig.de/cgi-bin/counter.rs>
+The source code is [available in a Gist][gist]. That's barely 50 lines (plus dependencies).
+
+Go deploy some cloud functions ... I mean lambdas ... I mean CGI scripts!
+
+[RFC 3424]: https://github.com/rust-lang/rfcs/blob/798ba4e1ef2175400e4c029cf952aa2d6df96f45/text/3424-cargo-script.md
+[fcgiwrap]: https://www.nginx.com/resources/wiki/start/topics/examples/fcgiwrap/
+[cgi]: https://crates.io/crates/cgi
+[cgi-fork]: https://github.com/badboy/rust-cgi
+[hello-world.rs]: https://fnordig.de/cgi-bin/hello-world.rs
+[gist]: https://gist.github.com/badboy/13dae661300e7e09b6f5430297fc341c
+
+---
+
+_Footnotes:_
+
+[^1]: Nightly.

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