supabase · laktek · Apr 6, 2023 · Apr 6, 2023
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/base/Cargo.toml b/base/Cargo.toml
@@ -31,4 +31,5 @@ reqwest = { version = "0.11.13" }
 serde = { version = "1.0.149", features = ["derive"] }
 tokio = { version = "1.24", features = ["full"] }
 url = { version = "2.3.1" }
+uuid = { version = "1.1.2", features = ["v4"] }
 v8 = { version = "0.60.1", default-features = false }
diff --git a/base/src/js_worker/user_workers.rs b/base/src/js_worker/user_workers.rs
@@ -1,5 +1,6 @@
 use crate::worker_ctx::{CreateUserWorkerResult, UserWorkerMsgs, UserWorkerOptions};
 
+use anyhow::Error;
 use deno_core::error::{custom_error, type_error, AnyError};
 use deno_core::futures::stream::Peekable;
 use deno_core::futures::Stream;
@@ -27,6 +28,7 @@ use std::rc::Rc;
 use std::task::Context;
 use std::task::Poll;
 use tokio::sync::{mpsc, oneshot};
+use uuid::Uuid;
 
 pub fn init() -> Extension {
     Extension::builder("custom:user_workers")
@@ -54,7 +56,7 @@ pub async fn op_user_worker_create(
 ) -> Result<String, AnyError> {
     let op_state = state.borrow();
     let tx = op_state.borrow::<mpsc::UnboundedSender<UserWorkerMsgs>>();
-    let (result_tx, result_rx) = oneshot::channel::<CreateUserWorkerResult>();
+    let (result_tx, result_rx) = oneshot::channel::<Result<CreateUserWorkerResult, Error>>();
 
     let mut env_vars = HashMap::new();
     for (key, value) in env_vars_vec {
@@ -79,8 +81,15 @@ pub async fn op_user_worker_create(
         ));
     }
 
+    // channel returns a Result<T, E>, we need to unwrap it first;
     let result = result.unwrap();
-    Ok(result.key)
+    if result.is_err() {
+        return Err(custom_error(
+            "create_user_worker_error",
+            result.unwrap_err().to_string(),
+        ));
+    }
+    Ok(result.unwrap().key.to_string())
 }
 
 #[derive(Deserialize, Debug)]
@@ -285,7 +294,8 @@ pub async fn op_user_worker_fetch_send(
         .ok()
         .expect("multiple op_user_worker_fetch_send ongoing");
     let (result_tx, result_rx) = oneshot::channel::<Response<Body>>();
-    tx.send(UserWorkerMsgs::SendRequest(key, request.0, result_tx));
+    let uuid = Uuid::parse_str(key.as_str())?;
+    tx.send(UserWorkerMsgs::SendRequest(uuid, request.0, result_tx));
 
     let result = result_rx.await;
     if result.is_err() {

diff --git a/base/src/worker_ctx.rs b/base/src/worker_ctx.rs
@@ -1,6 +1,6 @@
 use crate::js_worker::{MainWorker, UserWorker};
 
-use anyhow::Error;
+use anyhow::{bail, Error};
 use hyper::{Body, Request, Response};
 use log::{debug, error};
 use std::collections::HashMap;
@@ -11,7 +11,9 @@ use std::thread;
 use tokio::net::UnixStream;
 use tokio::sync::RwLock;
 use tokio::sync::{mpsc, oneshot};
+use uuid::Uuid;
 
+#[derive(Debug)]
 pub struct WorkerContext {
     handle: thread::JoinHandle<Result<(), Error>>,
     request_sender: hyper::client::conn::SendRequest<Body>,
@@ -41,6 +43,10 @@ impl WorkerContext {
         let import_map_path = options.import_map_path;
         let user_worker_msgs_tx = options.user_worker_msgs_tx;
 
+        if (!service_path.exists()) {
+            return bail!("main function does not exist {:?}", &service_path);
+        }
+
         // create a unix socket pair
         let (sender_stream, recv_stream) = UnixStream::pair()?;
 
@@ -90,6 +96,10 @@ impl WorkerContext {
         let import_map_path = options.import_map_path;
         let env_vars = options.env_vars;
 
+        if (!service_path.exists()) {
+            return bail!("user function does not exist {:?}", &service_path);
+        }
+
         // create a unix socket pair
         let (sender_stream, recv_stream) = UnixStream::pair()?;
 
@@ -141,13 +151,16 @@ impl WorkerContext {
 
 #[derive(Debug)]
 pub struct CreateUserWorkerResult {
-    pub key: String,
+    pub key: Uuid,
 }
 
 #[derive(Debug)]
 pub enum UserWorkerMsgs {
-    Create(UserWorkerOptions, oneshot::Sender<CreateUserWorkerResult>),
-    SendRequest(String, Request<Body>, oneshot::Sender<Response<Body>>),
+    Create(
+        UserWorkerOptions,
+        oneshot::Sender<Result<CreateUserWorkerResult, Error>>,
+    ),
+    SendRequest(Uuid, Request<Body>, oneshot::Sender<Response<Body>>),
 }
 
 pub struct WorkerPool {
@@ -174,23 +187,24 @@ impl WorkerPool {
         let main_worker = Arc::new(RwLock::new(main_worker_ctx));
 
         tokio::spawn(async move {
-            let mut user_workers: HashMap<String, Arc<RwLock<WorkerContext>>> = HashMap::new();
+            let mut user_workers: HashMap<Uuid, Arc<RwLock<WorkerContext>>> = HashMap::new();
 
             loop {
                 match user_worker_msgs_rx.recv().await {
                     None => break,
                     Some(UserWorkerMsgs::Create(worker_options, tx)) => {
-                        let key = worker_options.service_path.display().to_string();
-                        if !user_workers.contains_key(&key) {
-                            // TODO: handle errors
-                            let user_worker_ctx = WorkerContext::new_user_worker(worker_options)
-                                .await
-                                .unwrap();
-                            user_workers
-                                .insert(key.clone(), Arc::new(RwLock::new(user_worker_ctx)));
+                        let key = Uuid::new_v4();
+                        let user_worker_ctx = WorkerContext::new_user_worker(worker_options).await;
+                        if !user_worker_ctx.is_err() {
+                            user_workers.insert(
+                                key.clone(),
+                                Arc::new(RwLock::new(user_worker_ctx.unwrap())),
+                            );
+
+                            tx.send(Ok(CreateUserWorkerResult { key }));
+                        } else {
+                            tx.send(Err(user_worker_ctx.unwrap_err()));
                         }
-
-                        tx.send(CreateUserWorkerResult { key });
                     }
                     Some(UserWorkerMsgs::SendRequest(key, req, tx)) => {
                         // TODO: handle errors

diff --git a/examples/main/index.ts b/examples/main/index.ts
@@ -24,13 +24,21 @@ serve(async (req: Request) => {
   const no_module_cache = false;
   const import_map_path = null;
   const env_vars = [];
-  const worker = await EdgeRuntime.userWorkers.create({
-    service_path,
-    memory_limit_mb,
-    worker_timeout_ms,
-    no_module_cache,
-    import_map_path,
-    env_vars
-  });
-  return worker.fetch(req);
+  try {
+    const worker = await EdgeRuntime.userWorkers.create({
+      service_path,
+      memory_limit_mb,
+      worker_timeout_ms,
+      no_module_cache,
+      import_map_path,
+      env_vars
+    });
+    return worker.fetch(req);
+  } catch (e) {
+    const error = { msg: e.toString() }
+    return new Response(
+      JSON.stringify(error),
+      { status: 500, headers: { "Content-Type": "application/json" } },
+    )
+  }
 })