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#![allow(unused_imports)]
use core::time;
use std::{
collections::HashMap,
env,
fmt::format,
io::{Read, Write},
net::{TcpListener, TcpStream},
sync::{Arc, Mutex},
thread,
time::{Duration, SystemTime, UNIX_EPOCH},
};
use codecrafters_redis::{
rdb::{KeyExpiry, ParseError, RDBFile, RedisValue},
resp_bytes,
shared_cache::*,
};
use codecrafters_redis::{resp_commands::RedisCommands, server::RedisServer};
use codecrafters_redis::{
resp_parser::{parse, RespType},
server::SlaveServer,
};
fn spawn_cleanup_thread(cache: SharedCache) {
let cache_clone = cache.clone();
std::thread::spawn(move || {
loop {
std::thread::sleep(Duration::from_secs(10)); // Check every 10 seconds
let mut cache = cache_clone.lock().unwrap();
let now = SystemTime::now()
.duration_since(UNIX_EPOCH)
.unwrap()
.as_millis() as u64;
// Remove expired keys
cache.retain(|_, entry| entry.expires_at.map_or(true, |expiry| now <= expiry));
}
});
}
use base64::{engine::general_purpose, Engine as _};
fn write_rdb_to_stream<W: Write>(writer: &mut W) -> Result<(), Box<dyn std::error::Error>> {
let hardcoded_rdb = "UkVESVMwMDEx+glyZWRpcy12ZXIFNy4yLjD6CnJlZGlzLWJpdHPAQPoFY3RpbWXCbQi8ZfoIdXNlZC1tZW3CsMQQAPoIYW9mLWJhc2XAAP/wbjv+wP9aog==";
let bytes = general_purpose::STANDARD.decode(hardcoded_rdb)?;
let mut response = format!("${}\r\n", bytes.len()).into_bytes();
response.extend_from_slice(&bytes);
// Write the binary RDB data
writer.write_all(&response)?;
Ok(())
}
// TODO: This should return a Result to handle the plethora of different errors
fn handle_client(mut stream: TcpStream, server: Arc<Mutex<RedisServer>>) {
let mut buffer = [0; 512];
loop {
let _ = match stream.read(&mut buffer) {
Ok(0) => return, // connection closed
Ok(n) => n,
Err(_) => return, // error occurred
};
let request = parse(&buffer).unwrap();
let server_clone = Arc::clone(&server);
let response = RedisCommands::from(request.0.clone()).execute(server_clone);
let mut request_command = "".to_string();
// FIXME: Find a solution for this mess!!
match &request.0 {
RespType::Array(arr) => {
if let RespType::BulkString(s) = arr[0].clone() {
request_command = String::from_utf8(s).unwrap();
}
}
_ => {}
}
// Store the persistent connection
let shared_stream = Arc::new(Mutex::new(
stream.try_clone().expect("What could go wrong? :)"),
));
// if this true immediately write and send back rdb file after response
// HACK: This just feels wrong I feel this shouldn't be handled here and should be handled
// in the exexute command
if request_command.starts_with("PSYNC") {
stream.write(&response).unwrap();
let _ = write_rdb_to_stream(&mut stream);
// handshake completed and I should add the server sending me the handshake to my replicas
let replica_addr = stream
.peer_addr()
.expect("This shouldn't fail right? right?? :)");
let mut server = server.lock().unwrap();
server.add_replica(replica_addr, shared_stream);
} else {
// write respose back to the client
stream.write(&response).unwrap();
}
}
}
fn main() -> std::io::Result<()> {
let server = match RedisServer::new() {
Ok(Some(server)) => server,
Ok(None) => RedisServer::master(), // Default to master if no args
Err(e) => {
eprintln!("Error: {}", e);
std::process::exit(1);
}
};
// Load RDB file if dir and dbfilename are provided
if let (Some(dir), Some(dbfilename)) = (server.dir().clone(), server.dbfilename().clone()) {
if let Ok(rdb_file) = RDBFile::read(dir, dbfilename) {
if let Some(rdb) = rdb_file {
let mut cache = server.cache().lock().unwrap();
let hash_table = &rdb.databases.get(&0).unwrap().hash_table;
for (key, db_entry) in hash_table.iter() {
let value = match &db_entry.value {
RedisValue::String(data) => String::from_utf8(data.clone()).unwrap(),
RedisValue::Integer(data) => data.to_string(),
_ => {
unreachable!()
}
};
let expires_at = if let Some(key_expiry) = &db_entry.expiry {
Some(key_expiry.timestamp)
} else {
None
};
let cache_entry = CacheEntry { value, expires_at };
cache.insert(String::from_utf8(key.clone()).unwrap(), cache_entry);
}
}
}
}
let port = server.port().to_string();
let listener = TcpListener::bind(format!("127.0.0.1:{}", port)).unwrap();
spawn_cleanup_thread(server.cache().clone());
let server = Arc::new(Mutex::new(server));
for stream in listener.incoming() {
match stream {
Ok(stream) => {
let server_clone = Arc::clone(&server);
// TODO: Use tokio instead of multi threads to handle multiple clients
thread::spawn(|| {
handle_client(stream, server_clone);
});
}
Err(e) => {
eprintln!("Connection failed: {}", e);
}
}
}
Ok(())
}
|
