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use std::io::{BufReader, Read, Write};
use std::net::{SocketAddr, TcpStream, ToSocketAddrs};
use std::sync::Arc;
use std::thread::JoinHandle;
use witchcraft_metrics::{Meter, ExponentiallyDecayingReservoir, Histogram};
use hexdump::hexdump_iter;
use crate::iso8583::IsoError;
use crate::iso8583::iso_spec::{IsoMsg, Spec};
use crate::iso8583::mli::{MLI, MLI2E, MLI2I, MLI4E, MLI4I, MLIType};
pub struct IsoServerError {
pub msg: String
}
pub struct ISOServer {
sock_addr: Vec<SocketAddr>,
pub(crate) mli: Arc<Box<dyn MLI>>,
pub spec: &'static crate::iso8583::iso_spec::Spec,
pub(crate) msg_processor: Arc<Box<dyn MsgProcessor>>,
txn_rate_metric: Meter,
response_time_metric: witchcraft_metrics::Histogram,
}
pub trait MsgProcessor: Send + Sync {
fn process(&self, iso_server: &ISOServer, msg: &mut Vec<u8>) -> Result<(Vec<u8>, IsoMsg), IsoError>;
}
impl ISOServer {
pub fn new<'a>(host_port: String, spec: &'static Spec, mli_type: MLIType, msg_processor: Box<dyn MsgProcessor>) -> Result<ISOServer, IsoServerError> {
let mli: Arc<Box<dyn MLI>>;
match mli_type {
MLIType::MLI2E => {
mli = Arc::new(Box::new(MLI2E {}));
}
MLIType::MLI2I => {
mli = Arc::new(Box::new(MLI2I {}));
}
MLIType::MLI4E => {
mli = Arc::new(Box::new(MLI4E {}));
}
MLIType::MLI4I => {
mli = Arc::new(Box::new(MLI4I {}));
}
}
match host_port.to_socket_addrs() {
Ok(addrs) => {
let addrs = addrs.as_slice();
let addrs = addrs.iter().filter(|s| s.is_ipv4()).map(|s| *s).collect::<Vec<SocketAddr>>();
if addrs.len() > 0 {
Ok(ISOServer {
sock_addr: addrs,
spec,
mli,
msg_processor: Arc::new(msg_processor),
txn_rate_metric: Meter::new(),
response_time_metric: Histogram::new(ExponentiallyDecayingReservoir::new()),
})
} else {
Err(IsoServerError { msg: format!("invalid host_port: {} : unresolvable?", &host_port) })
}
}
Err(e) => Err(IsoServerError { msg: format!("invalid host_port: {}: cause: {}", &host_port, e.to_string()) })
}
}
pub fn txn_rate_metric(&self) -> &Meter {
&self.txn_rate_metric
}
pub fn response_time_metric(&self) -> &Histogram {
&self.response_time_metric
}
pub fn start(&self) -> JoinHandle<()> {
let server = ISOServer {
sock_addr: self.sock_addr.clone(),
spec: self.spec,
mli: self.mli.clone(),
msg_processor: self.msg_processor.clone(),
txn_rate_metric: Meter::new(),
response_time_metric: Histogram::new(ExponentiallyDecayingReservoir::new()),
};
std::thread::spawn(move || {
let listener = std::net::TcpListener::bind(server.sock_addr.as_slice()).unwrap();
for stream in listener.incoming() {
let client = stream.unwrap();
debug!("Accepted new connection .. {:?}", &client.peer_addr());
new_client(&server, client);
}
})
}
}
fn new_client(iso_server: &ISOServer, stream_: TcpStream) {
let server = ISOServer {
sock_addr: iso_server.sock_addr.clone(),
spec: iso_server.spec,
mli: iso_server.mli.clone(),
msg_processor: iso_server.msg_processor.clone(),
txn_rate_metric: Meter::new(),
response_time_metric: Histogram::new(ExponentiallyDecayingReservoir::new()),
};
std::thread::spawn(move || {
let stream = stream_;
let mut reading_mli = true;
let mut mli: u32 = 0;
let mut reader = BufReader::with_capacity(8192, &stream);
let mut writer: Box<dyn Write> = Box::new(&stream);
let mut t1 = std::time::Instant::now();
'done:
loop {
if reading_mli {
match server.mli.parse(&mut reader) {
Ok(n) => {
mli = n;
t1 = std::time::Instant::now();
reading_mli = false;
}
Err(e) => {
error!("client socket_err: {} {}", &stream.peer_addr().unwrap().to_string(), e.msg);
break 'done;
}
};
} else {
if mli > 0 {
let mut data = vec![0; mli as usize];
debug!("reading data for mli {} ", mli);
match reader.read_exact(&mut data[..]) {
Err(e) => {
error!("client socket_err: {} {}", stream.peer_addr().unwrap().to_string(), e.to_string());
break 'done;
}
_ => (),
};
mli = 0;
reading_mli = true;
debug!("received request: \n{}\n len = {}", get_hexdump(&data), mli);
match server.msg_processor.process(&server, &mut data) {
Ok(resp) => {
debug!("iso_response : {} \n parsed :\n --- {} \n --- \n", get_hexdump(&resp.0), resp.1);
match server.mli.create(&(resp.0).len()) {
Ok(mut resp_data) => {
(&mut resp_data).write_all(resp.0.as_slice()).unwrap();
writer.write_all(resp_data.as_slice()).unwrap();
writer.flush().unwrap();
debug!("request processing time = {} millis", std::time::Instant::now().duration_since(t1).as_millis());
}
Err(e) => {
error!("failed to construct mli {}", e.msg)
}
}
}
Err(e) => {
error!("failed to handle incoming req - {}", e.msg)
}
}
}
}
}
});
}
pub(in crate::iso8583) fn get_hexdump(data: &Vec<u8>) -> String {
let mut hexdmp = String::new();
hexdmp.push_str("\n");
hexdump_iter(data).for_each(|f| {
hexdmp.push_str(f.as_ref());
hexdmp.push_str("\n");
});
hexdmp
}