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|
use std::{
os::unix::net::{UnixListener, UnixStream},
sync::{Arc, atomic::Ordering},
thread::JoinHandle,
};
use camino::{Utf8Path, Utf8PathBuf};
use gatherer_api::{
request::{self, Request},
response::{self, Response},
};
use crate::{Database, State, thread};
pub struct ApiThread {
handle: JoinHandle<()>,
}
impl ApiThread {
pub fn start(
socket_path: Utf8PathBuf,
db: Arc<Database>,
state: State,
graph_directory: Utf8PathBuf,
) -> Self {
let handle = std::thread::spawn(move || runner(socket_path, db, state, graph_directory));
tracing::info!("started api thread");
Self { handle }
}
pub fn wait(self) {
self.handle.join().unwrap()
}
}
fn runner(socket_path: Utf8PathBuf, db: Arc<Database>, state: State, graph_directory: Utf8PathBuf) {
let us = UnixListener::bind(socket_path).unwrap();
for connection in us.incoming() {
tracing::info!("got connection!");
match connection {
Ok(stream) => {
let db_clone = Arc::clone(&db);
let state_clone = state.clone();
let graph_directory = graph_directory.clone();
std::thread::spawn(|| {
handle_connection(stream, db_clone, state_clone, graph_directory)
});
}
Err(err) => {
tracing::error!(%err)
}
}
}
}
fn handle_connection(
mut stream: UnixStream,
db: Arc<Database>,
state: State,
graph_directory: Utf8PathBuf,
) {
let mut buffer = vec![0; 8096];
loop {
match gatherer_api::read_packet(&mut stream, &mut buffer) {
Err(err) => {
tracing::error!("read failed; closing connection! {err}");
return;
}
Ok(count) => {
let packet = &buffer[..count];
let req = Request::from_buffer(packet).unwrap();
let response = match req.message() {
request::Message::GetGraphBounds => graph_bounds(&state),
request::Message::GenerateGraphs => {
let body = req.get_body().unwrap();
generate_graphs(body, &db)
}
request::Message::GetRegularGraphs => regular_graphs(&state, &graph_directory),
};
tracing::trace!("sending response back");
response.send(&mut stream).unwrap();
}
}
}
}
fn graph_bounds(state: &State) -> Response {
tracing::info!("request for graph bounds");
let bounds = response::GraphBounds {
mem_upper: state.meminfo_upper_bound.load(Ordering::Relaxed) as u64,
mem_current: state.meminfo_current.load(Ordering::Relaxed) as u64,
net_upper: state.netinfo_upper_bound.load(Ordering::Relaxed) as u64,
cpu_upper: state.cpuinfo_upper_bound.load(Ordering::Relaxed) as u8,
};
Response::new(response::Message::GraphBounds)
.with_body(bounds)
.unwrap()
}
fn generate_graphs(body: request::GenerateGraphsBody, db: &Database) -> Response {
tracing::info!("request to generate graphs");
let root = body.directory;
let mem = root.join("current_hostmeminfo.gif");
let net = root.join("current_hostnetinfo.gif");
let cpu = root.join("current_hostcpuinfo.gif");
let meminfo = thread::make_mem_graph(db, &mem).unwrap();
let net_upper = thread::make_net_graph(db, &net).unwrap();
let cpu_upper = thread::make_cpu_graph(db, &cpu).unwrap();
tracing::trace!("made all graphs");
let response_body = response::GeneratedGraphs {
meminfo: mem,
netinfo: net,
cpuinfo: cpu,
bounds: response::GraphBounds {
mem_upper: meminfo.upper,
mem_current: meminfo.current,
net_upper: net_upper,
cpu_upper: cpu_upper,
},
};
Response::new(response::Message::GeneratedGraphs)
.with_body(response_body)
.unwrap()
}
fn regular_graphs(state: &State, graph_directory: &Utf8Path) -> Response {
tracing::info!("request for regular graphs");
let root = graph_directory;
let mem = root.join("current_hostmeminfo.gif");
let net = root.join("current_hostnetinfo.gif");
let cpu = root.join("current_hostcpuinfo.gif");
let response_body = response::GeneratedGraphs {
meminfo: mem,
netinfo: net,
cpuinfo: cpu,
bounds: response::GraphBounds {
mem_upper: state.meminfo_upper_bound.load(Ordering::Relaxed),
mem_current: state.meminfo_current.load(Ordering::Relaxed),
net_upper: state.netinfo_upper_bound.load(Ordering::Relaxed),
cpu_upper: state.cpuinfo_upper_bound.load(Ordering::Relaxed),
},
};
Response::new(response::Message::GeneratedGraphs)
.with_body(response_body)
.unwrap()
}
|
