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

//! Remote Control through REST API
use axum::extract::{Path, State};
use axum::http::{StatusCode, Uri};
use axum::response::Redirect;
use axum::routing::{any, get, get_service};
use axum::Json;
use axum::Router;
use std::path;
use std::thread::JoinHandle;
use tower_http::cors::CorsLayer;
use tower_http::services::ServeDir;

use crate::runtime::config;
use crate::runtime::BlockDescription;
use crate::runtime::FlowgraphDescription;
use crate::runtime::Pmt;
use crate::runtime::PortId;
use crate::runtime::RuntimeHandle;

macro_rules! relative {
    ($path:expr) => {
        if cfg!(windows) {
            concat!(env!("CARGO_MANIFEST_DIR"), "\\", $path)
        } else {
            concat!(env!("CARGO_MANIFEST_DIR"), "/", $path)
        }
    };
}

async fn flowgraphs(State(rt): State<RuntimeHandle>) -> Json<Vec<usize>> {
    Json::from(rt.get_flowgraphs())
}

async fn flowgraph_description(
    Path(fg): Path<usize>,
    State(rt): State<RuntimeHandle>,
) -> Result<Json<FlowgraphDescription>, StatusCode> {
    let fg = rt.get_flowgraph(fg);
    if let Some(mut fg) = fg {
        if let Ok(d) = fg.description().await {
            return Ok(Json::from(d));
        }
    }
    Err(StatusCode::BAD_REQUEST)
}

async fn block_description(
    Path((fg, blk)): Path<(usize, usize)>,
    State(rt): State<RuntimeHandle>,
) -> Result<Json<BlockDescription>, StatusCode> {
    let fg = rt.get_flowgraph(fg);
    if let Some(mut fg) = fg {
        if let Ok(d) = fg.block_description(blk).await {
            return Ok(Json::from(d));
        }
    }

    Err(StatusCode::BAD_REQUEST)
}

async fn handler_id(
    Path((fg, blk, handler)): Path<(usize, usize, String)>,
    State(rt): State<RuntimeHandle>,
) -> Result<Json<Pmt>, StatusCode> {
    let fg = rt.get_flowgraph(fg);
    let handler = match handler.parse::<usize>() {
        Ok(i) => PortId::Index(i),
        Err(_) => PortId::Name(handler),
    };
    if let Some(mut fg) = fg {
        if let Ok(ret) = fg.callback(blk, handler, Pmt::Null).await {
            return Ok(Json::from(ret));
        }
    }

    Err(StatusCode::BAD_REQUEST)
}

async fn handler_id_post(
    Path((fg, blk, handler)): Path<(usize, usize, String)>,
    State(rt): State<RuntimeHandle>,
    Json(pmt): Json<Pmt>,
) -> Result<Json<Pmt>, StatusCode> {
    let fg = rt.get_flowgraph(fg);
    let handler = match handler.parse::<usize>() {
        Ok(i) => PortId::Index(i),
        Err(_) => PortId::Name(handler),
    };
    if let Some(mut fg) = fg {
        if let Ok(ret) = fg.callback(blk, handler, pmt).await {
            return Ok(Json::from(ret));
        }
    }

    Err(StatusCode::BAD_REQUEST)
}

pub struct ControlPort {
    thread: Option<JoinHandle<()>>,
    handle: RuntimeHandle,
}

impl ControlPort {
    pub fn new(handle: RuntimeHandle, routes: Router) -> Self {
        let mut cp = ControlPort {
            handle,
            thread: None,
        };
        cp.start(Some(routes));
        cp
    }

    fn start(&mut self, custom_routes: Option<Router>) {
        if !config::config().ctrlport_enable {
            return;
        }

        if self.thread.is_some() {
            return;
        }

        let mut app = Router::new()
            .route("/api/fg/", get(flowgraphs))
            .route("/api/fg/:fg/", get(flowgraph_description))
            .route("/api/fg/:fg/block/:blk/", get(block_description))
            .route(
                "/api/fg/:fg/block/:blk/call/:handler/",
                get(handler_id).post(handler_id_post),
            )
            .route(
                "/api/block/*foo",
                any(|uri: Uri| async move {
                    let u = uri.to_string().split_off(11);
                    Redirect::permanent(&format!("/api/fg/0/block/{u}/"))
                }),
            )
            .layer(CorsLayer::permissive())
            .with_state(self.handle.clone());

        if let Some(c) = custom_routes {
            app = app.nest("/", c);
        }

        let frontend = if let Some(ref p) = config::config().frontend_path {
            Some(ServeDir::new(p))
        } else if path::Path::new(relative!("crates/frontend/dist")).is_dir() {
            Some(ServeDir::new(relative!("crates/frontend/dist")))
        } else {
            None
        };

        if let Some(service) = frontend {
            app = app.fallback_service(get_service(service));
        }

        let handle = std::thread::spawn(move || {
            let runtime = tokio::runtime::Builder::new_current_thread()
                .enable_all()
                .build()
                .unwrap();

            runtime.block_on(async move {
                let addr = config::config().ctrlport_bind.unwrap();
                if let Ok(s) = axum::Server::try_bind(&addr) {
                    debug!("Listening on {}", addr);
                    s.serve(app.into_make_service()).await.unwrap();
                } else {
                    warn!("CtrlPort address {} already in use", addr);
                }
            });
        });

        self.thread = Some(handle);
    }
}