better cleanup of storage state

src/state.rs

@@ -1,6 +1,6 @@
 use std::{collections::HashMap, io::ErrorKind};
 
-use log::{error, info};
+use log::{error, info, warn, debug};
 use tokio::{
     fs::File,
     io::{AsyncReadExt, AsyncWriteExt},
@@ -51,6 +51,36 @@ pub(crate) mod timestamp {
     }
 }
 
+async fn is_valid_entry(key: &str, info: &DownloadableFile) -> bool {
+    if !crate::util::is_ascii_alphanumeric(&key) {
+        error!("Invalid key in persistent storage: {}", key);
+        return false;
+    }
+    let file = if let Ok(f) = File::open(storage_dir().join(&key)).await {
+        f
+    } else {
+        error!(
+            "Unable to open file {} referenced in persistent storage",
+            key
+        );
+        return false;
+    };
+    let metadata = if let Ok(md) = file.metadata().await {
+        md
+    } else {
+        error!(
+            "Unable to get metadata for file {} referenced in persistent storage",
+            key
+        );
+        return false;
+    };
+    if metadata.len() != info.size {
+        error!("Mismatched file size for file {} referenced in persistent storage: expected {}, found {}", key, info.size, metadata.len());
+        return false;
+    }
+    true
+}
+
 pub(crate) struct PersistentState(HashMap<String, DownloadableFile>);
 impl PersistentState {
     pub(crate) async fn load() -> std::io::Result<Self> {
@@ -63,35 +93,18 @@ impl PersistentState {
                 info!("Loaded {} file entries from persistent storage", map.len());
                 let mut filtered: HashMap<String, DownloadableFile> = HashMap::new();
                 for (key, info) in map.into_iter() {
-                    if !crate::util::is_ascii_alphanumeric(&key) {
+                    if is_valid_entry(&key, &info).await {
-                        error!("Invalid key in persistent storage: {}", key);
-                        continue;
-                    }
-                    let file = if let Ok(f) = File::open(storage_dir().join(&key)).await {
-                        f
-                    } else {
-                        error!(
-                            "Unable to open file {} referenced in persistent storage",
-                            key
-                        );
-                        continue;
-                    };
-                    let metadata = if let Ok(md) = file.metadata().await {
-                        md
-                    } else {
-                        error!(
-                            "Unable to get metadata for file {} referenced in persistent storage",
-                            key
-                        );
-                        continue;
-                    };
-                    if metadata.len() != info.size {
-                        error!("Mismatched file size for file {} referenced in persistent storage: expected {}, found {}", key, info.size, metadata.len());
-                        continue;
-                    }
                         filtered.insert(key, info);
+                    } else {
+                        info!("Deleting invalid file {}", key);
+                        if let Err(e) = tokio::fs::remove_file(storage_dir().join(&key)).await {
+                            warn!("Failed to delete invalid file {}: {}", key, e);
                         }
-                Ok(Self(filtered))
+                    }
+                }
+                let mut loaded = Self(filtered);
+                loaded.save().await?;
+                Ok(loaded)
             }
             Err(e) => {
                 if let ErrorKind::NotFound = e.kind() {
@@ -104,6 +117,7 @@ impl PersistentState {
     }
 
     async fn save(&mut self) -> std::io::Result<()> {
+        info!("saving updated state: {} entries", self.0.len());
         File::create(storage_dir().join(STATE_FILE_NAME))
             .await?
             .write_all(&serde_json::to_vec_pretty(&self.0)?)
@@ -124,6 +138,7 @@ impl PersistentState {
     }
 
     pub(crate) async fn remove_file(&mut self, key: &str) -> std::io::Result<()> {
+        debug!("removing entry {} from state", key);
         self.0.remove(key);
         self.save().await
     }

src/upload.rs

@@ -1,6 +1,6 @@
 use std::{collections::HashSet, io::Write, task::Waker};
 
-use actix::{Actor, ActorContext, AsyncContext, Handler, Message, StreamHandler};
+use actix::{fut::future::ActorFutureExt, Actor, ActorContext, AsyncContext, Handler, Message, StreamHandler};
 use actix_http::ws::{CloseReason, Item};
 use actix_web_actors::ws::{self, CloseCode};
 use bytes::Bytes;
@@ -9,7 +9,7 @@ use rand::distributions::{Alphanumeric, DistString};
 use serde::Deserialize;
 use time::OffsetDateTime;
 
-use crate::{file::LiveWriter, DownloadableFile, UploadedFile};
+use crate::{file::LiveWriter, DownloadableFile, UploadedFile, storage_dir};
 
 const MAX_FILES: usize = 256;
 const FILENAME_DATE_FORMAT: &[time::format_description::FormatItem] =
@@ -115,7 +115,6 @@ impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for Uploader {
             Err(e) => {
                 error!("Websocket error: {}", e);
                 self.cleanup_after_error(ctx);
-                ctx.stop();
                 return;
             }
         };
@@ -128,7 +127,6 @@ impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for Uploader {
                     description: Some(e.to_string()),
                 }));
                 self.cleanup_after_error(ctx);
-                ctx.stop();
             }
             Ok(true) => {
                 info!("Finished uploading data");
@@ -140,9 +138,9 @@ impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for Uploader {
                 let data = self.app_data.clone();
                 let filename = self.storage_filename.clone();
                 ctx.wait(actix::fut::wrap_future(async move {
+                    debug!("Spawned future to remove uploader from entry {} before stopping", filename);
                     data.write().await.remove_uploader(&filename);
-                }));
+                }).map(|_, _, ctx: &mut Self::Context| ctx.stop()));
-                ctx.stop();
             }
             _ => (),
         }
@@ -191,7 +189,7 @@ impl Uploader {
                 }
                 let storage_filename = Alphanumeric.sample_string(&mut rand::thread_rng(), 8);
                 self.storage_filename = storage_filename.clone();
-                let storage_path = super::storage_dir().join(storage_filename.clone());
+                let storage_path = storage_dir().join(storage_filename.clone());
                 info!("storing to: {:?}", storage_path);
                 let writer = super::file::LiveFileWriter::new(&storage_path)?;
                 let addr = Some(ctx.address());
@@ -225,6 +223,7 @@ impl Uploader {
                 self.writer = Some(writer);
                 let data = self.app_data.clone();
                 ctx.spawn(actix::fut::wrap_future(async move {
+                    debug!("Spawned future to add entry {} to state", storage_filename);
                     data.write()
                         .await
                         .add_file(storage_filename, downloadable_file)
@@ -275,10 +274,15 @@ impl Uploader {
     }
 
     fn cleanup_after_error(&mut self, ctx: &mut <Self as Actor>::Context) {
+        info!("Cleaning up after failed upload of {}", self.storage_filename);
         let data = self.app_data.clone();
         let filename = self.storage_filename.clone();
-        ctx.spawn(actix::fut::wrap_future(async move {
+        ctx.wait(actix::fut::wrap_future(async move {
+            debug!("Spawned future to remove entry {} from state", filename);
             data.write().await.remove_file(&filename).await.unwrap();
-        }));
+        }).map(|_, _, ctx: &mut <Self as Actor>::Context| ctx.stop()));
+        if let Err(e) = std::fs::remove_file(storage_dir().join(&self.storage_filename)) {
+            error!("Failed to remove file {}: {}", self.storage_filename, e);
+        }
     }
 }