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|
use resp_parser::RespType;
use std::{env, sync::Arc};
use std::{
io::{Read, Write},
net::{TcpListener, TcpStream},
};
use crate::resp_parser::parse;
#[macro_use]
pub mod macros;
pub mod rdb;
pub mod resp_commands;
pub mod resp_parser;
pub mod shared_cache;
// TODO: Model this in a better way there could be an enum where a Slave Server is distinguised
// from master servers in 2 different structs
#[derive(Debug, Clone, Default)]
pub struct RedisServer {
pub role: String,
pub port: String,
pub master_host: String,
pub master_port: String,
pub master_replid: Option<String>,
pub master_repl_offset: Option<String>,
}
impl RedisServer {
fn new() -> Self {
Self {
role: "master".to_string(),
port: "6379".to_string(),
master_host: "".to_string(),
master_port: "".to_string(),
// HACK: Hardcoded for now
master_replid: Some("8371b4fb1155b71f4a04d3e1bc3e18c4a990aeeb".to_string()),
master_repl_offset: Some("0".to_string()),
}
}
}
#[derive(Debug, Default)]
pub struct Config {
pub dir: Option<String>,
pub dbfilename: Option<String>,
pub server: RedisServer,
}
fn handshake_process(slave: &RedisServer) -> Result<(), String> {
let master_address = format!("{}:{}", slave.master_host, slave.master_port);
match TcpStream::connect(master_address) {
Ok(mut stream) => {
let mut buffer = [0; 512];
let mut send_command = |command: &[u8]| -> Result<(), String> {
stream
.write_all(command)
.map_err(|e| format!("Failed to send: {}", e))?;
match stream.read(&mut buffer) {
Ok(0) | Err(_) => return Ok(()), // connection closed or error
Ok(_) => Ok(()),
}
};
// PING
send_command(&resp_bytes!(array => [resp!(bulk "PING")]))?;
// REPLCONF listening-port <PORT>
send_command(&resp_bytes!(array => [
resp!(bulk "REPLCONF"),
resp!(bulk "listening-port"),
resp!(bulk slave.port.clone())
]))?;
// REPLCONF capa psync2
send_command(&resp_bytes!(array => [
resp!(bulk "REPLCONF"),
resp!(bulk "capa"),
resp!(bulk "psync2")
]))?;
// PSYNC <REPL_ID> <REPL_OFFSSET>
send_command(&resp_bytes!(array => [
resp!(bulk "PSYNC"),
resp!(bulk "?"),
resp!(bulk "-1")
]))?;
Ok(())
}
Err(e) => Err(format!("Master node doesn't exist: {}", e)),
}
}
pub type SharedConfig = Arc<Option<Config>>;
impl Config {
pub fn new() -> Result<Option<Config>, String> {
let args: Vec<String> = env::args().collect();
if args.len() == 1 {
return Ok(None);
}
let mut dir = None;
let mut dbfilename = None;
let mut redis_server = RedisServer::new();
let mut i = 1; // Skip program name
while i < args.len() {
match args[i].as_str() {
"--dir" => {
if i + 1 >= args.len() {
return Err("--dir requires a value".to_string());
}
dir = Some(args[i + 1].clone());
i += 2;
}
"--dbfilename" => {
if i + 1 >= args.len() {
return Err("--dbfilename requires a value".to_string());
}
dbfilename = Some(args[i + 1].clone());
i += 2;
}
"--port" => {
if i + 1 >= args.len() {
return Err("--port requires a value".to_string());
}
redis_server.port = args[i + 1].clone();
i += 2;
}
"--replicaof" => {
if i + 1 >= args.len() {
return Err("--replicaof requires a value".to_string());
}
// TODO: Find a better name for this variable
let info = args[i + 1].clone();
let (master_host, master_port) = info.split_once(' ').unwrap();
redis_server.role = "slave".to_string();
// slaves don't have master attributes!!
redis_server.master_replid = None;
redis_server.master_repl_offset = None;
redis_server.master_host = master_host.to_string();
redis_server.master_port = master_port.to_string();
handshake_process(&redis_server)?;
i += 2;
}
_ => {
return Err(format!("Unknown argument: {}", args[i]));
}
}
}
Ok(Some(Config {
dir,
dbfilename,
server: redis_server,
}))
}
}
|
