2023-12-28 16:40:31 +00:00
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permalink: "/{{ year }}/{{ month }}/{{ day }}/cargo-script-and-cgi"
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title: "cargo script and cgi"
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2023-12-31 20:32:16 +00:00
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published_date: "2023-12-28 18:30:00 +0100"
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2023-12-28 16:40:31 +00:00
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layout: post.liquid
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data:
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route: blog
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excerpt: |
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Everything old is new again.
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These days things get deployed as Cloud Functions, Lambdas or whatever FaaS it is today.
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But those from the old days simply stuck with CGI and that's easily possible with Rust too.
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---
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Everything old is new again.
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These days things get deployed as Cloud Functions, Lambdas or whatever [FaaS](https://en.wikipedia.org/wiki/Function_as_a_service) it is today.
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But those from the old days [simply stuck with CGI](https://rednafi.com/go/reminiscing_cgi_scripts/).
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Modern[^1] Rust is perfect for that kind of world!
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Cargo now has support for single-file packages ([RFC 3424]),
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which allows you to stuff all your code into a single `.rs` file and then run that.
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It even caches the built binary, so it's efficient enough to run on every request.
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I went ahead and updated the [cgi] crate ([my fork here][cgi-fork]).
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Now all it takes is this little bit of Rust code:
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````rust
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#!/usr/bin/env -S cargo +nightly -q -Zscript
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```cargo
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[dependencies]
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2023-12-28 19:06:14 +00:00
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cgi2 = "0.7"
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2023-12-28 16:40:31 +00:00
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```
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#[cgi::main]
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fn main(_request: cgi::Request) -> cgi::Response {
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cgi::text_response(200, "Hello World!")
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}
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````
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Install the [fcgiwrap] tool, follow the instructions to configure Nginx and voilà:
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<https://fnordig.de/cgi-bin/hello-world.rs>
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Need some state? Throw in a database and you can keep track of that too:
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<https://fnordig.de/cgi-bin/counter.rs>
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The source code is [available in a Gist][gist]. That's barely 50 lines (plus dependencies).
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Go deploy some cloud functions ... I mean lambdas ... I mean CGI scripts!
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[RFC 3424]: https://github.com/rust-lang/rfcs/blob/798ba4e1ef2175400e4c029cf952aa2d6df96f45/text/3424-cargo-script.md
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[fcgiwrap]: https://www.nginx.com/resources/wiki/start/topics/examples/fcgiwrap/
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[cgi]: https://crates.io/crates/cgi
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[cgi-fork]: https://github.com/badboy/rust-cgi
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[hello-world.rs]: https://fnordig.de/cgi-bin/hello-world.rs
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[gist]: https://gist.github.com/badboy/13dae661300e7e09b6f5430297fc341c
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---
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_Footnotes:_
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[^1]: Nightly.
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