updated README.md (fixed tutorial), added more logging for config ini…

…tialization and middlewares (#1)

README.md

@@ -48,6 +48,22 @@ yarn run wrangler kv:namespace create CONFIG_KV --preview
 yarn run wrangler kv:namespace create CONFIG_KV
 ```
 
+add config from console output into `wrangler.toml` file, example:
+
+* dev:
+```toml
+kv_namespaces = [
+    { binding = "CONFIG_KV", preview_id = "PREVIEW_ID" }
+]
+```
+
+* prod:
+```toml
+kv_namespaces = [
+    { binding = "CONFIG_KV", id = "ID" },
+]
+```
+
 2. Prepare node list data with your list of endpoints
 
 Example and structure could be found in [node-config-example.json](node-config-example.json)
@@ -62,7 +78,7 @@ Tips:
 * go to Cloudflare UI -> Workers KV page
 * select your created namespace
 * create new item(entry) into namespace
-    * key - `origin`
+    * key - `origins`
     * value - valid JSON as array, example could be found in [node-config-example.json](node-config-example.json).
 
 ### Develop

src/index.ts

@@ -20,7 +20,19 @@ export default {
         env: Env,
         ctx: ExecutionContext
     ): Promise<Response> {
-        let config: Config = await loadConfig(env);
+        let config: Config;
+
+        try {
+            config = await loadConfig(env);
+        } catch (e) {
+            console.log("Failed to initialize config", e);
+            return getInternalServerErrorResponse();
+        }
+
+        if (!config || !config.origins || config.origins.length === 0) {
+            console.log("Config is empty");
+            return getInternalServerErrorResponse();
+        }
 
         const requestContext: RequestContext = {
             request,
@@ -34,7 +46,12 @@ export default {
 
         for (middleware of middlewares) {
             if (middleware.shouldBeProcessed(requestContext)) {
-                await middleware.process(requestContext);
+                try {
+                    await middleware.process(requestContext);
+                } catch (e) {
+                    console.log(`Failed to process ${middleware.slug} middleware`, e);
+                    break;
+                }
             }
         }