feat: implement injectServices middleware and useService helper

src/index.ts

@@ -1 +1,46 @@
-console.log("hono-netdi");
+import {
+  ServiceScope,
+  type IServiceProvider,
+  type IServiceScope,
+  type ServiceIdentifier,
+} from '@stevanfreeborn/netdi';
+
+import type { Context, MiddlewareHandler } from 'hono';
+
+const SERVICE_SCOPE_KEY = 'serviceScope';
+
+declare module 'hono' {
+  interface ContextVariableMap {
+    [SERVICE_SCOPE_KEY]?: IServiceScope;
+  }
+}
+
+export function injectServices(serviceProvider: IServiceProvider): MiddlewareHandler {
+  return async (c: Context, next: () => Promise<void>) => {
+    const scope = serviceProvider.createScope();
+
+    c.set(SERVICE_SCOPE_KEY, scope);
+
+    try {
+      await next();
+    } finally {
+      scope.dispose();
+    }
+  };
+}
+
+export function useService<T>(c: Context, serviceType: ServiceIdentifier<T>): T {
+  const scope = c.get(SERVICE_SCOPE_KEY);
+
+  if (!scope) {
+    throw new Error(
+      'Service scope not found in context. Did you add the injectServices middleware?',
+    );
+  }
+
+  if (scope instanceof ServiceScope === false) {
+    throw new Error('Service scope is not an instance of ServiceScope.');
+  }
+
+  return scope.serviceProvider.getService(serviceType);
+}