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use crate::common::expr::Error as ProtoError;
use crate::common::expr::Expr;
use crate::common::term::Term;
use std::io::BufReader;
use std::io::Write;
use std::net::TcpStream;
use std::process::ExitCode;
pub const USAGE: &str = "
Usage: blom start
Starts the blom repl.
-b, --bind Bind to the given ADDRESS:PORT. Default is
0.0.0.0:4902
";
enum Error {
Connect,
}
pub fn cmd(args: &[String]) -> ExitCode {
let mut addr = "0.0.0.0:4902";
let mut arg_index: usize = 0;
while arg_index < args.len() {
match args[arg_index].as_str() {
"--addr" | "-a" => {
addr = args
.get(arg_index + 1)
.expect("Missing address after --addr.")
.as_str();
arg_index += 1;
}
_ => {
println!("Too many arguments.");
return ExitCode::FAILURE;
}
}
arg_index += 1;
}
match start(addr) {
Ok(()) => ExitCode::SUCCESS,
Err(_) => ExitCode::FAILURE,
}
}
fn start(addr: &str) -> Result<(), Error> {
let mut term = Term::new();
term.setup_prompt(format!("{addr}> ").as_bytes());
term.setup_hints(hints);
while let Some(query) = input(&mut term) {
if query.is_empty() {
continue;
}
let mut stream = match try_connect(addr) {
Ok(stream) => stream,
Err(_) => continue,
};
let expr = Expr::from_query(&query);
if stream.write(&expr.encode()).is_err() {
println!("Couldn't connect to blom at {addr}");
continue;
}
let mut resp = BufReader::new(&stream);
match Expr::from_bytes(&mut resp) {
Ok(resp) => println!("{resp}"),
Err(ProtoError::ConnectionClosed) => {
println!("Couldn't connect to blom at {addr}");
continue;
}
Err(e) => {
println!("{e}");
break;
}
}
}
Ok(())
}
fn try_connect(addr: &str) -> Result<TcpStream, Error> {
match TcpStream::connect(addr) {
Ok(stream) => Ok(stream),
Err(_) => {
println!("Couldn't connect to blom at {addr}.");
Err(Error::Connect)
}
}
}
fn input(term: &mut Term) -> Option<String> {
let line = term.edit()?;
let query = std::str::from_utf8(&line).unwrap().trim();
if query == "exit" {
return None;
}
Some(query.to_string())
}
// TODO: Refactor
fn hints(line: &[u8]) -> &[u8] {
match line {
b"ECHO" | b"echo" => b" MESSAGE",
b"SET" | b"set" => b" BLOCK META",
b"GET" | b"get" => b" BLOCK",
b"DEL" | b"del" => b" BLOCK",
b"EXISTS" | b"exists" => b" BLOCK",
b"INFO" | b"info" => b" BLOCK",
b"PARENT" | b"parent" => b" BLOCK",
b"CHILDREN" | b"children" => b" BLOCK",
b"ECHO " | b"echo " => b"MESSAGE",
b"SET " | b"set " => b"BLOCK META",
b"GET " | b"get " => b"BLOCK",
b"DEL " | b"del " => b"BLOCK",
b"EXISTS " | b"exists " => b"BLOCK",
b"INFO " | b"info " => b"BLOCK",
b"PARENT " | b"parent " => b"BLOCK",
b"CHILDREN " | b"children " => b"BLOCK",
_ => b"",
}
}
|
