Just pushing everything in for backup.
This commit is contained in:
parent
64720ab226
commit
6a9bc09be3
261
Cargo.lock
generated
Normal file
261
Cargo.lock
generated
Normal file
@ -0,0 +1,261 @@
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||||
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dependencies = [
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"libc",
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"wasi",
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"windows-sys",
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]
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name = "object"
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"memchr",
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name = "pin-project-lite"
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"proc-macro2",
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"quote",
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"unicode-ident",
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]
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[[package]]
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"bytes",
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"libc",
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"mio",
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"pin-project-lite",
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"signal-hook-registry",
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"tokio-macros",
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"windows-sys",
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]
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[[package]]
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"proc-macro2",
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"quote",
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"syn",
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]
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[[package]]
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name = "unicode-ident"
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"windows-targets",
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]
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[[package]]
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name = "windows-targets"
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checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
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dependencies = [
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"windows_aarch64_gnullvm",
|
||||
"windows_aarch64_msvc",
|
||||
"windows_i686_gnu",
|
||||
"windows_i686_gnullvm",
|
||||
"windows_i686_msvc",
|
||||
"windows_x86_64_gnu",
|
||||
"windows_x86_64_gnullvm",
|
||||
"windows_x86_64_msvc",
|
||||
]
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||||
|
||||
[[package]]
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name = "windows_aarch64_gnullvm"
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[[package]]
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name = "windows_aarch64_msvc"
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[[package]]
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name = "windows_i686_gnu"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "windows_i686_gnullvm"
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version = "0.52.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
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||||
|
||||
[[package]]
|
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name = "windows_i686_msvc"
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version = "0.52.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnu"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnullvm"
|
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version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
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|
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[[package]]
|
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name = "windows_x86_64_msvc"
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version = "0.52.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
|
||||
@ -11,3 +11,4 @@ license-file = "LICENSE.md"
|
||||
|
||||
|
||||
[dependencies]
|
||||
tokio = { version = "1.44.1", features = ["macros", "rt-multi-thread", "io-std", "io-util", "time", "signal", "sync"] }
|
||||
|
||||
64
docs/problem_statement.md
Normal file
64
docs/problem_statement.md
Normal file
@ -0,0 +1,64 @@
|
||||
# Problem Statement
|
||||
You are a member of the flight software team at Umbra and are responsible
|
||||
for writing code that manages the satellite’s propulsion system.
|
||||
|
||||
Firing the propulsion system involves waiting for a certain period of time before ignition.
|
||||
|
||||
The following is an example usage of this system:
|
||||
|
||||
* At absolute time t = 0, send a command to the computer to fire the propulsion in 15 seconds
|
||||
* At absolute time t = 2, send a command to the computer to fire the propulsion in 30 seconds
|
||||
* At absolute time t = 32, the computer begins firing the propulsion
|
||||
|
||||
The flight computer should accept a command with a relative time of when to fire
|
||||
the propulsion - once that time has elapsed, the program should print out “firing now!”.
|
||||
If another command is received before the propulsion is fired then the most recently
|
||||
received relative time should overwrite any existing commands.
|
||||
|
||||
More formally, if a command _A_ is waiting to fire and another command _B_ is received
|
||||
before A has fired, then B should replace _A_ as the pending command and _A_ should never fire.
|
||||
|
||||
If a time of -1 is given, any outstanding commands to fire the propulsion are cancelled.
|
||||
|
||||
Note that the flight computer should be able to fire the thruster multiple times in a
|
||||
single execution of the program.
|
||||
|
||||
You may use exactly one of the following interfaces for getting data into and out of your program:
|
||||
* Standard input/standard output
|
||||
* TCP
|
||||
|
||||
You can use whichever is more convenient - we note that some languages make asynchronous
|
||||
IO with standard input/standard output cumbersome and have thus included TCP.
|
||||
|
||||
If you do choose to use TCP, please have your server listen on port `8124`.
|
||||
|
||||
A sample TCP client, `propulsion_tcp_client.py`, is provided that plumbs standard input
|
||||
to TCP writes and likewise plumbs TCP reads to standard output.
|
||||
|
||||
Commands should be delineated by newlines.
|
||||
|
||||
A sample _complete_ execution of your program using standard input and output is shown below
|
||||
|
||||
```
|
||||
./your_program
|
||||
15
|
||||
30
|
||||
firing now!
|
||||
```
|
||||
|
||||
# Submitting your code
|
||||
You may complete this assignment in any programming language that you wish.
|
||||
We're most familiar with Rust and Python at Umbra, but we always enjoy learning
|
||||
new languages and seeing solutions with different tools!
|
||||
|
||||
Your final submission for this exercise should be a zip file including:
|
||||
* The source code of your program.
|
||||
* A brief README with a description of your approach and instructions on how to
|
||||
build and run the program.
|
||||
* Any libraries or frameworks needed to run your program, or instructions for installing them.
|
||||
|
||||
Please ensure that your code is clear and legible before submitting.
|
||||
|
||||
While we don't expect you to write production-quality code for this exercise,
|
||||
readability goes a long way in helping us review your submission.
|
||||
|
||||
BIN
src/.main.rs.swp
Normal file
BIN
src/.main.rs.swp
Normal file
Binary file not shown.
18
src/commands.rs
Normal file
18
src/commands.rs
Normal file
@ -0,0 +1,18 @@
|
||||
use tokio::time::Duration;
|
||||
|
||||
|
||||
|
||||
/// The commands available to send to the Satellite.
|
||||
#[derive(Clone, Copy)]
|
||||
pub enum Command
|
||||
{
|
||||
/// Fire the engine in T minus x seconds!
|
||||
Propulsion
|
||||
{
|
||||
/// The amount of seconds to wait before we fire the engines.
|
||||
delay: Duration
|
||||
},
|
||||
|
||||
/// Cancel any waiting commands.
|
||||
Cancel
|
||||
}
|
||||
182
src/main.rs
182
src/main.rs
@ -1,20 +1,186 @@
|
||||
//! Rust Challenge
|
||||
|
||||
mod commands;
|
||||
|
||||
|
||||
mod project;
|
||||
use std::io::Write;
|
||||
|
||||
use tokio::sync::{mpsc, watch};
|
||||
use tokio::time::{Duration, Interval};
|
||||
use tokio::io::AsyncWriteExt;
|
||||
|
||||
use crate::commands::Command;
|
||||
|
||||
|
||||
|
||||
/// Print the version of the project.
|
||||
fn print_version()
|
||||
type IoResult<T> = Result<T, std::io::Error>;
|
||||
|
||||
|
||||
|
||||
/// Reads input from the user until the termination signal is
|
||||
/// received. It will send command messages every time it reads valid input.
|
||||
fn read_user_input(command_sender: mpsc::Sender<Command>,
|
||||
term_sender: watch::Sender<bool>)
|
||||
-> IoResult<()>
|
||||
{
|
||||
println!("{} v{}", project::get_name(), project::get_version());
|
||||
let mut running: bool = true;
|
||||
let mut buffer = String::new();
|
||||
|
||||
// Loop and read the user input.
|
||||
while running
|
||||
{
|
||||
buffer.clear();
|
||||
std::io::stdin().read_line(&mut buffer)?;
|
||||
std::io::stdout().flush().unwrap();
|
||||
|
||||
let input = buffer.trim();
|
||||
|
||||
match input
|
||||
{
|
||||
// A termination method wasn't specified in the document, so
|
||||
// this will terminate when either stop, exit, or quit is entered.
|
||||
"exit" | "stop" | "quit" =>
|
||||
{
|
||||
println!("Exiting application.");
|
||||
running = false;
|
||||
term_sender.send_replace(running);
|
||||
}
|
||||
|
||||
_ =>
|
||||
{
|
||||
// Check to see if we were given a number.
|
||||
match input.parse::<i32>()
|
||||
{
|
||||
Ok(seconds) =>
|
||||
{
|
||||
// Here we are just handling the different possible numbers
|
||||
// passed in. -1 cancels commands, less than -1 is ignored
|
||||
// with a message, and greated than -1 is turned into a
|
||||
// propulsion command.
|
||||
if seconds == -1
|
||||
{
|
||||
match command_sender.blocking_send(Command::Cancel)
|
||||
{
|
||||
Ok(_) =>
|
||||
{
|
||||
println!("Cancelling any outstanding commands.")
|
||||
}
|
||||
Err(e) => println!("Failed to send command: {}", e)
|
||||
}
|
||||
}
|
||||
else if seconds < -1
|
||||
{
|
||||
println!("All propulsion delay times are given in \
|
||||
seconds within the range of [0, {}]",
|
||||
u32::MAX);
|
||||
println!("A value of -1 will cancel any current \
|
||||
propulsion commands.");
|
||||
}
|
||||
else
|
||||
{
|
||||
let larger_seconds: u64 = seconds as u64;
|
||||
let delay_duration: Duration = Duration::from_secs(larger_seconds);
|
||||
match command_sender.try_send(Command::Propulsion { delay: delay_duration })
|
||||
{
|
||||
Ok(_) =>
|
||||
{
|
||||
println!("Firing the engines in {} seconds.",
|
||||
seconds)
|
||||
}
|
||||
Err(e) => println!("Failed to send command: {}", e)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Err(e) =>
|
||||
{
|
||||
println!("Unable to parse the given input into seconds.");
|
||||
println!("Please specify only seconds until the time to \
|
||||
fire the engines.");
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
|
||||
/// The usual starting point of your project.
|
||||
fn main()
|
||||
async fn process_commands(mut command_receiver: mpsc::Receiver<Command>,
|
||||
mut term_receiver: watch::Receiver<bool>)
|
||||
->IoResult<()>
|
||||
{
|
||||
print_version();
|
||||
let mut stdout = tokio::io::stdout();
|
||||
|
||||
let mut running: bool = true;
|
||||
while running
|
||||
{
|
||||
tokio::select! {
|
||||
Some(command) = command_receiver.recv() =>
|
||||
{
|
||||
match command
|
||||
{
|
||||
Command::Cancel =>
|
||||
{
|
||||
stdout.write_all(b"Received: Cancel\n").await?;
|
||||
stdout.flush().await?;
|
||||
}
|
||||
|
||||
Command::Propulsion { delay } =>
|
||||
{
|
||||
let mut buffer: Vec<u8> = Vec::new();
|
||||
writeln!(&mut buffer, "Received: {:?} delay", delay);
|
||||
stdout.write_all(&buffer).await?;
|
||||
stdout.flush().await?;
|
||||
}
|
||||
|
||||
_ => {}
|
||||
}
|
||||
}
|
||||
|
||||
_ = term_receiver.changed() => {
|
||||
stdout.write_all(b"Communication task received shutdown message.").await?;
|
||||
stdout.flush().await?;
|
||||
running = *term_receiver.borrow_and_update();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Program entry point.
|
||||
#[tokio::main]
|
||||
async fn main() -> IoResult<()>
|
||||
{
|
||||
// The channel that will be used to send satellite commands between tasks.
|
||||
let (command_sender, mut command_receiver) = mpsc::channel::<Command>(100);
|
||||
|
||||
// The channel that will be used to signal termination of the program.
|
||||
// True means the program is running. False means it has been terminated.
|
||||
//
|
||||
// This could be done as a satellite command since the program is driven by
|
||||
// user interaction and it all happens from the input_task, but this is a
|
||||
// program signal so I prefer to keep it seperate from the command messages.
|
||||
// It also allows for moving termination control to another task, say from
|
||||
// Ctrl+C, if the program was changed to use TCP or something else.
|
||||
let (term_sender, mut term_receiver) = watch::channel(true);
|
||||
|
||||
// Spawn a task to handle reading input from the user. We use a thread here
|
||||
// because tokio recommends it for the blocking read calls for interactive
|
||||
// user input.
|
||||
let input_task = tokio::task::spawn_blocking(move || {
|
||||
read_user_input(command_sender, term_sender)
|
||||
});
|
||||
|
||||
// Spawn a task to handle simulating the satellite.
|
||||
let sim_task = tokio::spawn(async move {
|
||||
process_commands(command_receiver, term_receiver).await
|
||||
});
|
||||
|
||||
let (sim_result, input_result) = tokio::join!(sim_task, input_task);
|
||||
sim_result?;
|
||||
input_result??;
|
||||
println!("Shutdown complete.");
|
||||
Ok(())
|
||||
}
|
||||
|
||||
@ -1,33 +0,0 @@
|
||||
//! This is where the Projects build information can be retreived from.
|
||||
|
||||
|
||||
|
||||
/// The environment variable defined by Cargo for the name.
|
||||
const NAME: Option<&str> = option_env!("CARGO_PKG_NAME");
|
||||
|
||||
/// The environment variable defined by Cargo for the version.
|
||||
const VERSION: Option<&str> = option_env!("CARGO_PKG_VERSION");
|
||||
|
||||
/// The string to display if a value is not defined during compile time.
|
||||
const NOT_DEFINED: &'static str = "UNDEFINED";
|
||||
|
||||
|
||||
|
||||
/// Returns the name of the program as defined by the CARGO_PKG_NAME. This is
|
||||
/// set at compile time and comes from the Cargo.toml file.
|
||||
///
|
||||
/// If a value is not found, then it will return the not defined value.
|
||||
pub fn get_name() -> &'static str
|
||||
{
|
||||
NAME.unwrap_or(NOT_DEFINED)
|
||||
}
|
||||
|
||||
|
||||
/// Returns the name of the program as defined by the CARGO_PKG_VERSION. This is
|
||||
/// set at compile time and comes from the Cargo.toml file.
|
||||
///
|
||||
/// If a value is not found, then it will return the not defined value.
|
||||
pub fn get_version() -> &'static str
|
||||
{
|
||||
VERSION.unwrap_or(NOT_DEFINED)
|
||||
}
|
||||
3
src/satellite.rs
Normal file
3
src/satellite.rs
Normal file
@ -0,0 +1,3 @@
|
||||
pub struct Satellite
|
||||
{
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user