hatchery_server/
hub.rs

1//! P6: the hub behind the server control API: node calls forwarded by C2 and operator (HQ)
2//! calls for mail and tasks. All state lives under the data dir; admission is always read from
3//! the P2 ledger, never from the request.
4
5use crate::messenger::{Messenger, MessengerError, OPERATOR};
6use crate::provision::{read_ledger, LedgerEntry, NodeStatus};
7use crate::tasks::TaskStore;
8use serde_json::{json, Value};
9use std::path::{Path, PathBuf};
10use std::sync::{Condvar, Mutex};
11use std::time::{Duration, Instant};
12
13#[derive(Debug)]
14pub struct HubError {
15    pub status: u16,
16    pub message: String,
17}
18
19impl HubError {
20    fn new(status: u16, message: impl Into<String>) -> Self {
21        Self { status, message: message.into() }
22    }
23}
24
25impl From<MessengerError> for HubError {
26    fn from(e: MessengerError) -> Self {
27        match e {
28            MessengerError::Forbidden => Self::new(403, "refused"),
29            MessengerError::Bad(m) => Self::new(400, m),
30            MessengerError::Internal(m) => Self::new(500, m),
31        }
32    }
33}
34
35pub struct Hub {
36    data_dir: PathBuf,
37    messenger: Mutex<Messenger>,
38    tasks: Mutex<TaskStore>,
39    /// Bumped on every message sent; lets HQ long-poll for new mail instead of polling blindly.
40    mail_signal: (Mutex<u64>, Condvar),
41}
42
43fn str_field<'a>(v: &'a Value, name: &str) -> Result<&'a str, HubError> {
44    v.get(name).and_then(Value::as_str).ok_or_else(|| HubError::new(400, format!("missing field: {name}")))
45}
46
47impl Hub {
48    pub fn open(data_dir: &Path) -> Result<Self, crate::error::ServerError> {
49        Ok(Self {
50            data_dir: data_dir.to_owned(),
51            messenger: Mutex::new(Messenger::open(data_dir)?),
52            tasks: Mutex::new(TaskStore::open(data_dir)?),
53            mail_signal: (Mutex::new(0), Condvar::new()),
54        })
55    }
56
57    fn bump_mail(&self) {
58        *self.mail_signal.0.lock().expect("signal") += 1;
59        self.mail_signal.1.notify_all();
60    }
61
62    fn entry(&self, node_id: &str) -> Option<LedgerEntry> {
63        read_ledger(&self.data_dir).ok()?.into_iter().find(|e| e.node_id == node_id)
64    }
65
66    /// Active (member/trusted) node holding `capability`, per the ledger.
67    fn admitted(&self, node_id: &str, capability: &str) -> bool {
68        node_id != OPERATOR
69            && self.entry(node_id).is_some_and(|e| {
70                matches!(e.status, NodeStatus::Member | NodeStatus::Trusted) && e.grants.capabilities.iter().any(|c| c == capability)
71            })
72    }
73
74    /// A call made on behalf of a node. The caller (C2) has authenticated the node and checked its
75    /// policy; the hub checks the ledger again, independently.
76    pub fn node_call(&self, node_id: &str, op: &str, payload: &Value) -> Result<Value, HubError> {
77        let capability = match op.split_once('.').map(|p| p.0) {
78            Some("mail") => "mail",
79            Some("task") => "tasks",
80            _ => return Err(HubError::new(404, "unknown operation")),
81        };
82        if !self.admitted(node_id, capability) {
83            return Err(HubError::new(403, "refused"));
84        }
85        match op {
86            "mail.send" => {
87                let key = payload.get("idempotency_key").and_then(Value::as_str).map(str::to_owned);
88                let id = self.messenger.lock().expect("messenger").send(node_id, str_field(payload, "to")?, str_field(payload, "subject")?, str_field(payload, "body")?, key)?;
89                self.bump_mail();
90                Ok(json!({ "message_id": id }))
91            }
92            "mail.inbox" => {
93                let since = payload.get("since_ms").and_then(Value::as_u64).unwrap_or(0);
94                let limit = payload.get("limit").and_then(Value::as_u64).unwrap_or(50).min(256) as u16;
95                let mail = self.messenger.lock().expect("messenger").inbox(node_id, since, limit)?;
96                Ok(json!({ "messages": mail }))
97            }
98            "mail.ack" => {
99                self.messenger.lock().expect("messenger").ack(node_id, str_field(payload, "message_id")?)?;
100                Ok(json!({ "ok": true }))
101            }
102            "task.list" => {
103                let tasks = self.tasks.lock().expect("tasks").list(Some(node_id), true).map_err(|e| HubError::new(500, e.to_string()))?;
104                Ok(json!({ "tasks": tasks }))
105            }
106            "task.update" => {
107                let id = payload.get("id").and_then(Value::as_i64).ok_or_else(|| HubError::new(400, "missing field: id"))?;
108                let status = str_field(payload, "status")?;
109                if !matches!(status, "in_progress" | "done") {
110                    return Err(HubError::new(400, "status must be in_progress or done"));
111                }
112                let changed = self.tasks.lock().expect("tasks").set_status(id, status, Some(node_id)).map_err(|e| HubError::new(500, e.to_string()))?;
113                if changed { Ok(json!({ "ok": true })) } else { Err(HubError::new(403, "refused")) }
114            }
115            _ => Err(HubError::new(404, "unknown operation")),
116        }
117    }
118
119    /// Operator (HQ) calls, authenticated by the control bearer in the HTTP layer.
120    pub fn operator_call(&self, method: &str, path: &str, body: &Value) -> Result<Value, HubError> {
121        let (path, query) = path.split_once('?').unwrap_or((path, ""));
122        let parts: Vec<&str> = path.trim_matches('/').split('/').collect();
123        match (method, parts.as_slice()) {
124            ("POST", ["v1", "tasks"]) => {
125                let assignee = body.get("assignee").and_then(Value::as_str);
126                if let Some(node) = assignee {
127                    if !self.admitted(node, "tasks") {
128                        return Err(HubError::new(403, "assignee does not hold the tasks capability"));
129                    }
130                }
131                let task = self.tasks.lock().expect("tasks").create(str_field(body, "title")?, body.get("body").and_then(Value::as_str).unwrap_or(""), assignee).map_err(|e| HubError::new(500, e.to_string()))?;
132                Ok(json!({ "task": task }))
133            }
134            ("GET", ["v1", "tasks"]) => {
135                let assignee = query.split('&').find_map(|kv| kv.strip_prefix("assignee="));
136                let tasks = self.tasks.lock().expect("tasks").list(assignee, false).map_err(|e| HubError::new(500, e.to_string()))?;
137                Ok(json!({ "tasks": tasks }))
138            }
139            ("POST", ["v1", "tasks", id, "assign"]) => {
140                let id: i64 = id.parse().map_err(|_| HubError::new(400, "bad id"))?;
141                let node = str_field(body, "assignee")?;
142                if !self.admitted(node, "tasks") {
143                    return Err(HubError::new(403, "assignee does not hold the tasks capability"));
144                }
145                if self.tasks.lock().expect("tasks").assign(id, node).map_err(|e| HubError::new(500, e.to_string()))? { Ok(json!({ "ok": true })) } else { Err(HubError::new(409, "task cannot be assigned")) }
146            }
147            ("POST", ["v1", "tasks", id, "cancel"]) => {
148                let id: i64 = id.parse().map_err(|_| HubError::new(400, "bad id"))?;
149                if self.tasks.lock().expect("tasks").set_status(id, "cancelled", None).map_err(|e| HubError::new(500, e.to_string()))? { Ok(json!({ "ok": true })) } else { Err(HubError::new(409, "task is final")) }
150            }
151            ("POST", ["v1", "mail", "send"]) => {
152                let id = self.messenger.lock().expect("messenger").send(OPERATOR, str_field(body, "to")?, str_field(body, "subject")?, str_field(body, "body")?, None)?;
153                self.bump_mail();
154                Ok(json!({ "message_id": id }))
155            }
156            // Long-poll for HQ: returns as soon as the operator inbox holds a message newer than
157            // `since_ms`, or after `timeout_secs` (max 30) with an empty list.
158            ("POST", ["v1", "mail", "wait"]) => {
159                let since = body.get("since_ms").and_then(Value::as_u64).unwrap_or(0);
160                let deadline = Instant::now() + Duration::from_secs(body.get("timeout_secs").and_then(Value::as_u64).unwrap_or(25).min(30));
161                loop {
162                    let seen = *self.mail_signal.0.lock().expect("signal");
163                    let mail: Vec<_> = self.messenger.lock().expect("messenger").inbox(OPERATOR, since, 100)?.into_iter().filter(|m| m.created_at_ms > since).collect();
164                    if !mail.is_empty() {
165                        return Ok(json!({ "messages": mail }));
166                    }
167                    let now = Instant::now();
168                    if now >= deadline {
169                        return Ok(json!({ "messages": [] }));
170                    }
171                    let guard = self.mail_signal.0.lock().expect("signal");
172                    if *guard == seen {
173                        let _ = self.mail_signal.1.wait_timeout(guard, deadline - now).expect("signal wait");
174                    }
175                }
176            }
177            ("POST", ["v1", "mail", "thread"]) => {
178                let mail = self.messenger.lock().expect("messenger").thread(str_field(body, "node")?, 200)?;
179                Ok(json!({ "messages": mail }))
180            }
181            ("POST", ["v1", "mail", "inbox"]) => {
182                let mail = self.messenger.lock().expect("messenger").inbox(OPERATOR, 0, 100)?;
183                Ok(json!({ "messages": mail }))
184            }
185            _ => Err(HubError::new(404, "not found")),
186        }
187    }
188}
hatchery_server/hub.rs

hatchery_server/
hub.rs
