rics/
host.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
//! Server hosting features

//use std::fs::{File, remove_file};
use std::io::{Result, Read, Write};
//use std::io::{stdout, stdin};
#[cfg(target_family="unix")]
use std::os::unix::net::{UnixListener};
use std::net::TcpListener;
use std::sync::{RwLock, Arc, Mutex};
use std::thread;
use std::thread::JoinHandle;
use std::process;

use protobuf::{Message, CodedInputStream};

use std::collections::{HashMap};
use super::rics;
use rand;
use rand::Rng;


/// Contains server permanent state
pub struct ServerState {
    /// Flag for if the CAN broadcasting is enabled
    can_broadcast: bool,
    /// Determines the likelyhood of a CAN message being dropped
    /// in CAN mode, if a message is dropped, no one receives the
    /// message
    can_drop_chance: f32,
    /// Internal flag for node id allocation
    node_allocator: i32,
    /// Holds the self described names of the nodes
    node_names: HashMap<i32, String>,
    /// Input socket handle
    node_inputs: HashMap<i32, Arc<Mutex<dyn Read + Send + Sync>>>,
    /// Output socket handle
    node_outputs: HashMap<i32, Arc<Mutex<dyn Write + Send + Sync>>>,
    /// Current loading routes
    node_routing: HashMap<i32, Vec<i32>>,
}

impl ServerState {

    pub fn new() -> ServerState {
        ServerState {
            can_broadcast: false,
            can_drop_chance: 0.00,
            node_allocator: 0,
            node_names: HashMap::new(),
            node_inputs: HashMap::new(),
            node_outputs: HashMap::new(),
            node_routing: HashMap::new(),
        }
    }

    fn get_can_broadcast(&self) -> bool {self.can_broadcast}

    fn set_can_broadcast(&mut self, broadcast: bool) {
        self.can_broadcast = broadcast;
    }

    fn get_node_names(&self) -> &HashMap<i32, String> {
        &self.node_names
    }


    fn delete_node(&mut self, node: i32) {
        if node + 1 == self.node_allocator {
            self.node_allocator -= 1;
        }

        self.node_inputs.remove(&node);
        self.node_names.remove(&node);
        self.node_outputs.remove(&node);
        self.node_routing.remove(&node);
    }

    fn new_node_raw<T>(&mut self, name_op: Option<T>, is_op: Option<Arc<Mutex<dyn Read + Send + Sync>>>, os_op: Option<Arc<Mutex<dyn Write + Send + Sync>>>) -> i32 where T: Into<String> {
        let n = self.node_allocator;
        self.node_allocator += 1;
        if let Some(is) = is_op {
            self.node_inputs.insert(n, is);
        };

        match name_op {
            Some(name) => self.node_names.insert(n, name.into()),
            None => self.node_names.insert(n, n.to_string()),
        };

        if let Some(os) = os_op {
            self.node_outputs.insert(n, os);
        }

        self.node_routing.insert(n, vec![]);

        n
    }

    fn new_node(&mut self, is: Arc<Mutex<dyn Read + Send + Sync>>, os: Arc<Mutex<dyn Write + Send + Sync>>) -> i32 {
        self.new_node_raw::<String>(None, Some(is), Some(os))
    }

    fn new_sink(&mut self, os: Arc<Mutex<dyn Write + Send + Sync>>) -> i32 {
        self.new_node_raw::<String>(None, None, Some(os))
    }

    fn set_node_name(&mut self, node: i32, name: impl Into<String>) {
        let str = name.into();
        trace!("Setting node {} to name {}", node, str.clone());
        self.node_names.insert(node, str);
    }

    fn rename_node(&mut self, node: i32, name: impl Into<String>) -> bool {
        if self.node_names.contains_key(&node) {
            self.set_node_name(node, name);
            true
        } else {
            false
        }
    }

    fn add_route(&mut self, node: i32, target: i32) {
        match self.node_routing.get_mut(&node) {
            Some(vec) => if !vec.contains(&target) { vec.push(target); } ,
            None => (),
        }
    }

    fn del_route(&mut self, node: i32, target: i32) {
        match self.node_routing.get_mut(&node) {
            Some(vec) => vec.retain(|&x| x != target),
            None => (),
        }
    }

    fn set_can_drop_chance(&mut self, v: f32) {
        if v >= 0.0 && v <= 1.0 {
            self.can_drop_chance = v;
            info!("Changing CAN drop rate to {}", v);
        } else {
            warn!("Invalid CAN drop value: {}", v);
        }
    }
}

/// Start listening for tcp socket connections (async)
pub fn run_tcp_listener(server_state: Arc<RwLock<ServerState>>, path: impl Into<String>) -> JoinHandle<Result<()>> {
    let path = path.into();

    thread::spawn(move|| {
        let listener = TcpListener::bind(path).expect("Can't bind tcp port");
        info!("Server is now listening for connections on TCP socket.");
        for stream in listener.incoming() {
            match stream {
                Ok(stream) => {
                    let state_ref = server_state.clone();
                    thread::spawn(move|| {
                        let mut sock_copy = stream.try_clone().unwrap();
                        let mut input = CodedInputStream::new(&mut sock_copy);
                        run_client(state_ref, stream, &mut input)
                    });
                }
                Err(err) => { error!("{}", err); }
            }
        }
        Ok(())
    })
}

/// Start listening for unix socket connections (async)
#[cfg(target_family="unix")]
pub fn run_unix_listener(server_state: Arc<RwLock<ServerState>>, path: impl Into<String>) -> JoinHandle<Result<()>> {
    let path = path.into();

    thread::spawn(move|| {
        let listener = UnixListener::bind(path).expect("Can't bind unix socket port");
        info!("Server is now listening for connections on Unix Domain socket");
        for stream in listener.incoming() {
            match stream {
                Ok(stream) => {
                    let state_ref = server_state.clone();
                    thread::spawn(move|| {
                        let mut sock_copy = stream.try_clone().unwrap();
                        let mut input = CodedInputStream::new(&mut sock_copy);
                        run_client(state_ref, stream, &mut input)
                    });
                }
                Err(err) => { error!("{}", err); }
            }
        }
        Ok(())
    })
}

#[cfg(target_family="windows")]
pub fn run_unix_listener(server_state: Arc<RwLock<ServerState>>, path: impl Into<String>) -> JoinHandle<Result<()>> {
    panic!("Windows is not compatible with Unix domain sockets");
}

/// Arbitrary client connection manager
fn run_client<T>(server_state: Arc<RwLock<ServerState>>, socket: T, input_stream: &mut CodedInputStream) where T: 'static+Read+Write+Sync+Send {
    debug!("New client connection accepted");
    // Initialize node if needed
    let socket_arc = Arc::new(Mutex::new(socket));
    let mut node = None;
    let mut rng = rand::thread_rng();

    if let Ok(connection) = input_stream.read_message::<rics::RICS_Connection>() {
        if connection.get_connect_as_node() {
            let mut state = server_state.write().unwrap();
            let nd = state.new_node(socket_arc.clone(), socket_arc.clone());
            state.set_node_name(nd, format!("{}",nd)); // Default name
            node = Some(nd);
            debug!("Creating node id {}", nd);
        } else {
            debug!("Opening info connection");
        }
    }

    // Message managing loop
    loop {
        match input_stream.read_message::<rics::RICS_Request>() {
            Ok(req) => {
                info!("Server received message {:?}", req);

                if req.has_set_name() {
                    let mut state = server_state.write().unwrap();
                    node.map(|x| state.rename_node(x, req.get_set_name()));
                    ()
                } else if req.has_query() {
                    match req.get_query() {
                        rics::RICS_Request_RICS_Query::NULL => (),
                        rics::RICS_Request_RICS_Query::LIST_SINK => {

                            let state = server_state.read().unwrap();

                            let mut response = rics::RICS_Response::new();
                            let mut idlist = rics::RICS_Response_RICS_IdList::new();
                            let ids: Vec<_> = state.get_node_names().iter().map(|(k,v)| {
                                let mut id = rics::RICS_Response_RICS_Id::new();
                                id.set_id(*k);
                                id.set_name(v.clone());
                                trace!("Reply node pair: {} - {}", *k, v.clone());
                                id
                            }).collect();
                            idlist.set_ids(protobuf::RepeatedField::from_vec(ids));
                            response.set_idlist(idlist);

                            let mut writer = socket_arc.lock().unwrap();
                            response.write_length_delimited_to_writer(&mut *writer).expect("Socket error");
                        },
                        rics::RICS_Request_RICS_Query::WHO_AM_I => {
                            debug!("Answer WHO_AM_I request with {:?}", node);
                            let mut msg = rics::RICS_Response::new();
                            node.map(|n| msg.set_node(n));
                            let mut writer = socket_arc.lock().unwrap();
                            msg.write_length_delimited_to_writer(&mut *writer).expect("Socket error");
                        },
                        rics::RICS_Request_RICS_Query::SET_FLAG_CAN_BROADCAST =>
                            server_state.write().unwrap().set_can_broadcast(true),
                        rics::RICS_Request_RICS_Query::CLEAR_FLAG_CAN_BROADCAST =>
                            server_state.write().unwrap().set_can_broadcast(false),
                        rics::RICS_Request_RICS_Query::DAEMON_QUIT => process::exit(2),
                    }
                    ()
                } else if req.has_data() {
                    // Packet message, must forward
                    let state = server_state.read().unwrap();

                    let mut msg = rics::RICS_Response::new();
                    let mut data = req.get_data().clone();
                    if let Some(n) = node { data.set_source(n); }
                    msg.set_data(data.clone());

                    // Broadcast Dropping
                    if state.can_drop_chance != 0.0 && data.get_field_type() == rics::RICS_Data_RICS_DataType::CAN {
                        if rng.gen::<f32>() < state.can_drop_chance {
                            info!("Server is dropping packet {:?}", data);
                            continue;
                        }
                    }
                    

                    // Forwarding
                    if state.get_can_broadcast() && data.get_field_type() == rics::RICS_Data_RICS_DataType::CAN {
                        // CAN broadcast forwarding
                        for (n, writer) in state.node_outputs.iter() {
                            if Some(*n) != node {
                                msg.write_length_delimited_to_writer(&mut *(writer.lock().unwrap())).expect("Socket error");
                            }
                        }
                    } else {
                        // Routing forwarding
                        for target in if data.has_target() {
                            vec![data.get_target()]
                        } else {
                            node.and_then(|n| state.node_routing.get(&n).cloned()).unwrap_or(vec![])
                        } {
                            if let Some(writer) = state.node_outputs.get(&target) {
                                info!("Forwarding to {}", target);
                                msg.write_length_delimited_to_writer(&mut *(writer.lock().unwrap())).expect("Socket error");
                            }
                        }
                        ()
                    }
                } else if req.has_add_route() {
                    let mut state = server_state.write().unwrap();

                    let i = req.get_add_route().get_from();
                    let j = req.get_add_route().get_to();

                    state.add_route(i, j);
                } else if req.has_del_route() {
                    let mut state = server_state.write().unwrap();

                    let i = req.get_del_route().get_from();
                    let j = req.get_del_route().get_to();

                    state.del_route(i, j);
                } else if req.has_can_drop_chance() {
                    let mut state = server_state.write().unwrap();
                    state.set_can_drop_chance( req.get_can_drop_chance() );
                } else {
                    warn!("Invalid message {:?}", req);
                }
            },
            Err(err) => { warn!("Invalid message query {}, closing connection", err); break; },
        }
    }

    if let Some(n) = node {
        let mut state = server_state.write().unwrap();
        state.delete_node(n);
    }
}