From 6a10fcaf64938da52b326ea80013d9f30ed62a6c Mon Sep 17 00:00:00 2001
From: Owen Jacobson <owen@grimoire.ca>
Date: Sat, 5 Oct 2024 22:42:43 -0400
Subject: Separate `/api/boot` into its own module.

---
 src/boot/app.rs | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 src/boot/app.rs

(limited to 'src/boot/app.rs')

diff --git a/src/boot/app.rs b/src/boot/app.rs
new file mode 100644
index 0000000..fc84b3a
--- /dev/null
+++ b/src/boot/app.rs
@@ -0,0 +1,54 @@
+use sqlx::sqlite::SqlitePool;
+
+use super::{Channel, Snapshot};
+use crate::{
+    channel::repo::Provider as _, event::repo::Provider as _, message::repo::Provider as _,
+};
+
+pub struct Boot<'a> {
+    db: &'a SqlitePool,
+}
+
+impl<'a> Boot<'a> {
+    pub const fn new(db: &'a SqlitePool) -> Self {
+        Self { db }
+    }
+
+    pub async fn snapshot(&self) -> Result<Snapshot, sqlx::Error> {
+        let mut tx = self.db.begin().await?;
+        let resume_point = tx.sequence().current().await?;
+        let channels = tx.channels().all(resume_point.into()).await?;
+
+        let channels = {
+            let mut snapshots = Vec::with_capacity(channels.len());
+
+            let channels = channels.into_iter().filter_map(|channel| {
+                channel
+                    .as_of(resume_point)
+                    .map(|snapshot| (channel, snapshot))
+            });
+
+            for (channel, snapshot) in channels {
+                let messages = tx
+                    .messages()
+                    .in_channel(&channel, resume_point.into())
+                    .await?;
+
+                let messages = messages
+                    .into_iter()
+                    .filter_map(|message| message.as_of(resume_point));
+
+                snapshots.push(Channel::new(snapshot, messages));
+            }
+
+            snapshots
+        };
+
+        tx.commit().await?;
+
+        Ok(Snapshot {
+            resume_point,
+            channels,
+        })
+    }
+}
-- 
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