clndash: invoice loading

Signed-off-by: William Casarin <jb55@jb55.com>

crates/notedeck_clndash/src/watch.rs

@@ -0,0 +1,198 @@
+use crate::event::Invoice;
+use lnsocket::CallOpts;
+use lnsocket::CommandoClient;
+use serde::Deserialize;
+use serde_json::json;
+use std::sync::Arc;
+
+#[derive(Deserialize)]
+struct UpdatedInvoicesResponse {
+    updated: u64,
+}
+
+#[derive(Deserialize)]
+struct PayIndexInvoices {
+    invoices: Vec<PayIndexScan>,
+}
+
+#[derive(Deserialize)]
+struct PayIndexScan {
+    pay_index: Option<u64>,
+}
+
+async fn find_lastpay_index(commando: Arc<CommandoClient>) -> Result<Option<u64>, lnsocket::Error> {
+    const PAGE: u64 = 250;
+    // 1) get the current updated tail
+    let created_value = commando
+        .call(
+            "wait",
+            json!({"subsystem":"invoices","indexname":"updated","nextvalue":0}),
+        )
+        .await?;
+    let response: UpdatedInvoicesResponse =
+        serde_json::from_value(created_value).map_err(|_| lnsocket::Error::Json)?;
+
+    // start our window at the tail
+    let mut start_at = response
+        .updated
+        .saturating_add(1) // +1 because we want max(1, updated - PAGE + 1)
+        .saturating_sub(PAGE)
+        .max(1);
+
+    loop {
+        // 2) fetch a window (indexed by "updated")
+        let val = commando
+            .call_with_opts(
+                "listinvoices",
+                json!({
+                    "index": "updated",
+                    "start": start_at,
+                    "limit": PAGE,
+                }),
+                // only fetch the one field we care about
+                CallOpts::default().filter(json!({
+                    "invoices": [{"pay_index": true}]
+                })),
+            )
+            .await?;
+
+        let parsed: PayIndexInvoices =
+            serde_json::from_value(val).map_err(|_| lnsocket::Error::Json)?;
+
+        if let Some(pi) = parsed.invoices.iter().filter_map(|inv| inv.pay_index).max() {
+            return Ok(Some(pi));
+        }
+
+        // 4) no paid invoice in this slice—step back or bail
+        if start_at == 1 {
+            return Ok(None);
+        }
+
+        start_at = start_at.saturating_sub(PAGE).max(1);
+    }
+}
+
+pub async fn fetch_paid_invoices(
+    commando: Arc<CommandoClient>,
+    limit: u32,
+) -> Result<Vec<Invoice>, lnsocket::Error> {
+    use tokio::task::JoinSet;
+
+    // look for an invoice with the last paid index
+    let Some(lastpay_index) = find_lastpay_index(commando.clone()).await? else {
+        // no paid invoices
+        return Ok(vec![]);
+    };
+
+    let mut set: JoinSet<Result<Invoice, lnsocket::Error>> = JoinSet::new();
+    let start = lastpay_index.saturating_sub(limit as u64);
+
+    // 3) Fire off at most `concurrency` `waitanyinvoice` calls at a time,
+    //    collect all successful responses into a Vec.
+    // fire them ALL at once
+    for idx in start..lastpay_index {
+        let c = commando.clone();
+        set.spawn(async move {
+            let val = c
+                .call(
+                    "waitanyinvoice",
+                    serde_json::json!({ "lastpay_index": idx }),
+                )
+                .await?;
+            let parsed: Invoice = serde_json::from_value(val).map_err(|_| lnsocket::Error::Json)?;
+            Ok(parsed)
+        });
+    }
+
+    let mut results = Vec::with_capacity(limit as usize);
+    while let Some(res) = set.join_next().await {
+        results.push(res.map_err(|_| lnsocket::Error::Io(std::io::ErrorKind::Interrupted))??);
+    }
+
+    results.sort_by(|a, b| a.updated_index.cmp(&b.updated_index));
+
+    Ok(results)
+}
+
+// wip watch subsystem
+/*
+async fn watch_subsystem(
+    commando: CommandoClient,
+    subsystem: WaitSubsystem,
+    index: WaitIndex,
+    event_tx: UnboundedSender<Event>,
+    mut cancel_rx: Receiver<()>,
+) {
+    // Step 1: Fetch current index value so we can back up ~20
+    let mut nextvalue: u64 = match commando
+        .call(
+            "wait",
+            serde_json::json!({
+                "indexname": index.as_str(),
+                "subsystem": subsystem.as_str(),
+                "nextvalue": 0
+            }),
+        )
+        .await
+    {
+        Ok(v) => {
+            // You showed the result has `updated` as the current highest index
+            let current = v.get("updated").and_then(|x| x.as_u64()).unwrap_or(0);
+            current.saturating_sub(20) // back up 20, clamp at 0
+        }
+        Err(err) => {
+            tracing::warn!("initial wait(…nextvalue=0) failed: {}", err);
+            0
+        }
+    };
+
+    loop {
+        // You can add a timeout to avoid hanging forever in weird network states.
+        let fut = commando.call(
+            "wait",
+            serde_json::to_value(WaitRequest {
+                indexname: "invoices".into(),
+                subsystem: "lightningd".into(),
+                nextvalue,
+            })
+            .unwrap(),
+        );
+
+        tokio::select! {
+            _ = &mut cancel_rx => {
+                // graceful shutdown
+                break;
+            }
+
+            res = fut => {
+                match res {
+                    Ok(v) => {
+                        // Typical shape: { "nextvalue": n, "invoicestatus": { ... } } (varies by plugin/index)
+                        // Adjust these lookups for your node’s actual wait payload.
+                        if let Some(nv) = v.get("nextvalue").and_then(|x| x.as_u64()) {
+                            nextvalue = nv + 1;
+                        } else {
+                            // Defensive: never get stuck — bump at least by 1
+                            nextvalue += 1;
+                        }
+
+                        // Inspect/route
+                        let kind = v.get("status").and_then(|s| s.as_str());
+                        let ev = match kind {
+                            Some("paid") => ClnResponse::Invoice(InvoiceEvent::Paid(v.clone())),
+                            Some("created") => ClnResponse::Invoice(InvoiceEvent::Created(v.clone())),
+                            _ => ClnResponse::Invoice(InvoiceEvent::Other(v.clone())),
+                        };
+                        let _ = event_tx.send(Event::Response(ev));
+                    }
+                    Err(err) => {
+                        tracing::warn!("wait(invoices) error: {err}");
+                        // small backoff so we don't tight-loop on persistent errors
+                        tokio::time::sleep(std::time::Duration::from_millis(500)).await;
+                    }
+                }
+            }
+        }
+    }
+}
+*/