[single-threaded-web-server] created a functioning single-threaded web server

# This file is automatically @generated by Cargo.

# It is not intended for manual editing.

version = 4

[[package]]

name = "single-threaded-web-server"

version = "0.1.0"

[package]

name = "single-threaded-web-server"

version = "0.1.0"

edition = "2024"

[dependencies]

use std::{

    fs,

    io::{BufReader, prelude::*},

    net::{TcpListener, TcpStream},

};

use std::process::exit;

fn main() {

    println!("[single-threaded-web-service] application started");

    let listener = TcpListener::bind("127.0.0.1:7878").unwrap_or_else(|error| {

        eprintln!("error when binding to port 7878: {}", error);

        exit(1);

    });

    for stream in listener.incoming() {

        let stream = stream.unwrap_or_else(|error| {

            eprintln!("error when calling stream.unwrap_or_else(): {}", error);

            exit(1);

        });

        println!("[single-threaded-web-service] connection established");

        handle_connection(stream);

    }

}

fn handle_connection(mut stream: TcpStream) {

    let buf_reader = BufReader::new(&stream);

    // note: the book suggests only reading the request line, but I want to be able to log the whole request

    let http_request: Vec<_> = buf_reader

        .lines()

        .map(|result| result.unwrap())

        .take_while(|line| !line.is_empty())

        .collect();

    println!("Received request: {http_request:#?}");

    let request_verb_type_version = http_request.get(0).unwrap();

    let (status_line, html_file_name) = if request_verb_type_version == "GET / HTTP/1.1" {

        ("HTTP/1.1 200 OK", "hello.html")

    } else {

        ("HTTP/1.1 404 NOT FOUND", "404.html")

    };

    let response_body = fs::read_to_string(html_file_name).unwrap_or_else(|error| {

        eprintln!("error when reading {}: {}", html_file_name, error);

        exit(1);

    });

    let response_body_length = response_body.len();

    let response =

        format!("{}\r\nContent-Length:{}\r\n\r\n{}",

                status_line,

                response_body_length,

                response_body);

    println!("response is {response}");

    stream.write_all(response.as_bytes()).unwrap();

}