add panic shim to Sequencer (#143)

Author: RageKnify

crates/ct_worker/shim.js

@@ -0,0 +1,51 @@
+import shim, {
+    Sequencer, Batcher, Cleaner, __wbg_reset_state,
+} from "./build/worker/shim.mjs";
+
+// no-op worker entrypoint for now
+const WorkerEntrypointProxy = new Proxy(shim, {});
+
+const DOProxy = new Proxy(Sequencer, {
+    construct(target, args) {
+        const state = args[0] // get state
+        // const env = args[1] // get env
+        try {
+            const instance = new target(...args);
+
+            return new Proxy(instance, {
+                get(target, prop, receiver) {
+                    const original = Reflect.get(target, prop, receiver);
+                    // Check if the property is a function
+                    if (typeof original === 'function') {
+                        return new Proxy(original, {
+                            async apply(target, thisArg, argArray) {
+                                try {
+                                    const resultPromise = await target.bind(thisArg, ...argArray)();
+                                    // const resultPromise = await target.bind(thisArg, ...argArray)()
+                                    return resultPromise;
+                                } catch (e) {
+                                    if (e.message == "memory access out of bounds") {
+                                        console.error(e)
+                                        __wbg_reset_state();
+                                        state.abort("Call to DO panicked, force-restarting DO")
+                                        return new Response("Worker panicked... restarting DO")
+                                    }
+                                    throw e;
+                                }
+
+
+                            }
+                        });
+                    }
+                    return original; // Return the property directly if it's not a function
+                }
+            });
+
+        } catch (err) {
+            __wbg_reset_state();
+            state.abort("Constructor for DO panicked, force-restarting DO")
+        }
+    },
+});
+
+export { DOProxy as Sequencer, Batcher, Cleaner, WorkerEntrypointProxy as default };

crates/ct_worker/wrangler.jsonc

@@ -1,6 +1,6 @@
 {
     "name": "static-ct",
-    "main": "build/worker/shim.mjs",
+    "main": "./shim.js",
     "compatibility_date": "2025-09-25",
     "workers_dev": false,
     "build": {