Add database exports

This should help admins running pict-rs on traditional filesystems to
keep valid backups of pict-rs' sled repo

README.md

@@ -487,6 +487,25 @@ A secure API key can be generated by any password generator.
         "msg": "No hash associated with provided alias"
     }
     ```
+- `POST /internal/export` Export the current sled database to the configured `export_path`. This is
+    useful for taking backups of a running pict-rs server. On success, it will return
+    ```json
+    {
+        "msg": "ok"
+    }
+    ```
+
+    Restoring from an exported database is as simple as:
+    1. Stopping pict-rs
+    2. Moving your current `sled-repo` directory to a safe location (e.g. `sled-repo.bak`)
+        ```bash
+        $ mv sled-repo sled-repo.bak
+        ```
+    3. Copying an exported database to `sled-repo`
+        ```bash
+        $ cp -r exports/2023-07-08T22:26:21.194126713Z sled-repo
+        ```
+    4. Starting pict-rs
 
 Additionally, all endpoints support setting deadlines, after which the request will cease
 processing. To enable deadlines for your requests, you can set the `X-Request-Deadline` header to an

defaults.toml

@@ -45,6 +45,7 @@ max_frame_count = 100
 type = "sled"
 path = "/mnt/sled-repo"
 cache_capacity = 67108864
+export_path = "/mnt/exports"
 
 [store]
 type = "filesystem"

dev.toml

@@ -31,6 +31,7 @@ skip_validate_imports = false
 type = 'sled'
 path = 'data/sled-repo-local'
 cache_capacity = 67108864
+export_path = "data/exports-local"
 
 [store]
 type = 'filesystem'

pict-rs.toml

@@ -270,6 +270,14 @@ path = '/mnt/sled-repo'
 # default: 67,108,864 (1024 * 1024 * 64, or 64MB)
 cache_capacity = 67108864
 
+## Optional: path for storing database exports
+# environment variable: PICTRS__REPO__EXPORT_PATH
+# default: /mnt/exports
+#
+# Used in combination with the /internal/export endpoint to dump the current sled database into a
+# new file. This can be helpful for backing up a running pict-rs server.
+export_path = "/mnt/exports"
+
 
 ## Media storage configuration
 [store]

src/config/commandline.rs

@@ -701,4 +701,7 @@ struct Sled {
     #[arg(short, long)]
     #[serde(skip_serializing_if = "Option::is_none")]
     cache_capacity: Option<u64>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    export_path: Option<PathBuf>,
 }

src/config/defaults.rs

@@ -96,6 +96,7 @@ enum RepoDefaults {
 struct SledDefaults {
     path: PathBuf,
     cache_capacity: u64,
+    export_path: PathBuf,
 }
 
 #[derive(Clone, Debug, serde::Serialize)]
@@ -203,6 +204,7 @@ impl Default for SledDefaults {
         SledDefaults {
             path: PathBuf::from(String::from("/mnt/sled-repo")),
             cache_capacity: 1024 * 1024 * 64,
+            export_path: PathBuf::from(String::from("/mnt/exports")),
         }
     }
 }

src/config/file.rs

@@ -158,4 +158,6 @@ pub(crate) struct Sled {
     pub(crate) path: PathBuf,
 
     pub(crate) cache_capacity: u64,
+
+    pub(crate) export_path: PathBuf,
 }

src/details.rs

@@ -6,10 +6,11 @@ use crate::{
     store::Store,
 };
 use actix_web::web;
+use time::format_description::well_known::Rfc3339;
 
 #[derive(Copy, Clone, Debug, serde::Deserialize, serde::Serialize)]
 #[serde(untagged)]
-enum MaybeHumanDate {
+pub(crate) enum MaybeHumanDate {
     HumanDate(#[serde(with = "time::serde::rfc3339")] time::OffsetDateTime),
     OldDate(#[serde(serialize_with = "time::serde::rfc3339::serialize")] time::OffsetDateTime),
 }
@@ -123,3 +124,15 @@ impl From<MaybeHumanDate> for std::time::SystemTime {
         }
     }
 }
+
+impl std::fmt::Display for MaybeHumanDate {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::OldDate(date) | Self::HumanDate(date) => {
+                let s = date.format(&Rfc3339).map_err(|_| std::fmt::Error)?;
+
+                f.write_str(&s)
+            }
+        }
+    }
+}

src/lib.rs

@@ -36,6 +36,7 @@ use futures_util::{
     Stream, StreamExt, TryStreamExt,
 };
 use once_cell::sync::{Lazy, OnceCell};
+use repo::sled::SledRepo;
 use rusty_s3::UrlStyle;
 use std::{
     future::ready,
@@ -1113,11 +1114,16 @@ fn next_worker_id() -> String {
     format!("{}-{}", CONFIG.server.worker_id, next_id)
 }
 
-fn configure_endpoints<R: FullRepo + 'static, S: Store + 'static>(
+fn configure_endpoints<
+    R: FullRepo + 'static,
+    S: Store + 'static,
+    F: Fn(&mut web::ServiceConfig),
+>(
     config: &mut web::ServiceConfig,
     repo: R,
     store: S,
     client: Client,
+    extra_config: F,
 ) {
     config
         .app_data(web::Data::new(repo))
@@ -1184,7 +1190,8 @@ fn configure_endpoints<R: FullRepo + 'static, S: Store + 'static>(
                 .service(web::resource("/purge").route(web::post().to(purge::<R>)))
                 .service(web::resource("/aliases").route(web::get().to(aliases::<R>)))
                 .service(web::resource("/identifier").route(web::get().to(identifier::<R, S>)))
-                .service(web::resource("/set_not_found").route(web::post().to(set_not_found::<R>))),
+                .service(web::resource("/set_not_found").route(web::post().to(set_not_found::<R>)))
+                .configure(extra_config),
         );
 }
 
@@ -1204,44 +1211,51 @@ where
         .in_scope(|| actix_rt::spawn(queue::process_images(repo, store, next_worker_id())));
 }
 
-async fn launch_file_store<R: FullRepo + 'static>(
+async fn launch_file_store<R: FullRepo + 'static, F: Fn(&mut web::ServiceConfig) + Send + Clone>(
     repo: R,
     store: FileStore,
+    extra_config: F,
 ) -> std::io::Result<()> {
     HttpServer::new(move || {
         let client = build_client();
 
         let store = store.clone();
         let repo = repo.clone();
+        let extra_config = extra_config.clone();
 
         spawn_workers(repo.clone(), store.clone());
 
         App::new()
             .wrap(TracingLogger::default())
             .wrap(Deadline)
-            .configure(move |sc| configure_endpoints(sc, repo, store, client))
+            .configure(move |sc| configure_endpoints(sc, repo, store, client, extra_config))
     })
     .bind(CONFIG.server.address)?
     .run()
     .await
 }
 
-async fn launch_object_store<R: FullRepo + 'static>(
+async fn launch_object_store<
+    R: FullRepo + 'static,
+    F: Fn(&mut web::ServiceConfig) + Send + Clone,
+>(
     repo: R,
     store_config: ObjectStoreConfig,
+    extra_config: F,
 ) -> std::io::Result<()> {
     HttpServer::new(move || {
         let client = build_client();
 
         let store = store_config.clone().build(client.clone());
         let repo = repo.clone();
+        let extra_config = extra_config.clone();
 
         spawn_workers(repo.clone(), store.clone());
 
         App::new()
             .wrap(TracingLogger::default())
             .wrap(Deadline)
-            .configure(move |sc| configure_endpoints(sc, repo, store, client))
+            .configure(move |sc| configure_endpoints(sc, repo, store, client, extra_config))
     })
     .bind(CONFIG.server.address)?
     .run()
@@ -1355,6 +1369,18 @@ pub fn install_tracing() -> color_eyre::Result<()> {
     init_tracing(&CONFIG.tracing)
 }
 
+async fn export_handler(repo: web::Data<SledRepo>) -> Result<HttpResponse, Error> {
+    repo.export().await?;
+
+    Ok(HttpResponse::Created().json(&serde_json::json!({
+        "msg": "ok"
+    })))
+}
+
+fn sled_extra_config(sc: &mut web::ServiceConfig) {
+    sc.service(web::resource("/export").route(web::post().to(export_handler)));
+}
+
 /// Run the pict-rs application
 ///
 /// This must be called after `init_config`, or else the default configuration builder will run and
@@ -1422,7 +1448,7 @@ pub async fn run() -> color_eyre::Result<()> {
                         .requeue_in_progress(CONFIG.server.worker_id.as_bytes().to_vec())
                         .await?;
 
-                    launch_file_store(sled_repo, store).await?;
+                    launch_file_store(sled_repo, store, sled_extra_config).await?;
                 }
             }
         }
@@ -1457,7 +1483,7 @@ pub async fn run() -> color_eyre::Result<()> {
                         .requeue_in_progress(CONFIG.server.worker_id.as_bytes().to_vec())
                         .await?;
 
-                    launch_object_store(sled_repo, store).await?;
+                    launch_object_store(sled_repo, store, sled_extra_config).await?;
                 }
             }
         }

src/repo.rs

@@ -465,17 +465,13 @@ impl Repo {
     pub(crate) fn open(config: config::Repo) -> color_eyre::Result<Self> {
         match config {
             config::Repo::Sled(config::Sled {
-                mut path,
+                path,
                 cache_capacity,
+                export_path,
             }) => {
-                path.push("v0.4.0-alpha.1");
+                let repo = self::sled::SledRepo::build(path, cache_capacity, export_path)?;
 
-                let db = ::sled::Config::new()
-                    .cache_capacity(cache_capacity)
-                    .path(path)
-                    .open()?;
-
-                Ok(Self::Sled(self::sled::SledRepo::new(db)?))
+                Ok(Self::Sled(repo))
             }
         }
     }

src/repo/sled.rs

@@ -1,4 +1,5 @@
 use crate::{
+    details::MaybeHumanDate,
     repo::{
         Alias, AliasAlreadyExists, AliasRepo, AlreadyExists, BaseRepo, DeleteToken, Details,
         FullRepo, HashAlreadyExists, HashRepo, Identifier, IdentifierRepo, QueueRepo, SettingsRepo,
@@ -12,6 +13,7 @@ use futures_util::Stream;
 use sled::{CompareAndSwapError, Db, IVec, Tree};
 use std::{
     collections::HashMap,
+    path::PathBuf,
     pin::Pin,
     sync::{
         atomic::{AtomicU64, Ordering},
@@ -67,12 +69,20 @@ pub(crate) struct SledRepo {
     in_progress_queue: Tree,
     queue_notifier: Arc<RwLock<HashMap<&'static str, Arc<Notify>>>>,
     uploads: Tree,
+    cache_capacity: u64,
+    export_path: PathBuf,
     db: Db,
 }
 
 impl SledRepo {
-    #[tracing::instrument(skip(db))]
-    pub(crate) fn new(db: Db) -> Result<Self, SledError> {
+    #[tracing::instrument]
+    pub(crate) fn build(
+        path: PathBuf,
+        cache_capacity: u64,
+        export_path: PathBuf,
+    ) -> color_eyre::Result<Self> {
+        let db = Self::open(path, cache_capacity)?;
+
         Ok(SledRepo {
             healthz_count: Arc::new(AtomicU64::new(0)),
             healthz: db.open_tree("pict-rs-healthz-tree")?,
@@ -90,9 +100,42 @@ impl SledRepo {
             in_progress_queue: db.open_tree("pict-rs-in-progress-queue-tree")?,
             queue_notifier: Arc::new(RwLock::new(HashMap::new())),
             uploads: db.open_tree("pict-rs-uploads-tree")?,
+            cache_capacity,
+            export_path,
             db,
         })
     }
+
+    fn open(mut path: PathBuf, cache_capacity: u64) -> Result<Db, SledError> {
+        path.push("v0.4.0-alpha.1");
+
+        let db = ::sled::Config::new()
+            .cache_capacity(cache_capacity)
+            .path(path)
+            .open()?;
+
+        Ok(db)
+    }
+
+    #[tracing::instrument(level = "warn")]
+    pub(crate) async fn export(&self) -> Result<(), RepoError> {
+        let path = self
+            .export_path
+            .join(MaybeHumanDate::HumanDate(time::OffsetDateTime::now_utc()).to_string());
+
+        let export_db = Self::open(path, self.cache_capacity)?;
+
+        let this = self.db.clone();
+
+        actix_rt::task::spawn_blocking(move || {
+            let export = this.export();
+            export_db.import(export);
+        })
+        .await
+        .map_err(SledError::from)?;
+
+        Ok(())
+    }
 }
 
 impl BaseRepo for SledRepo {
@@ -289,6 +332,7 @@ impl QueueRepo for SledRepo {
             let worker_id = worker_id.clone();
             let job = b!(self.queue, {
                 in_progress_queue.remove(&worker_id)?;
+                in_progress_queue.flush()?;
 
                 while let Some((key, job)) = queue
                     .scan_prefix(queue_name.as_bytes())