WC-3584 Add eyeball routing config

Provided via a new optional param binding. When provided, it contains
info about free tier limiting for this account.

Author: matthewdavidrodgers

packages/workers-shared/router-worker/src/configuration.ts

@@ -1,17 +1,25 @@
-import type { RouterConfig } from "../../utils/types";
+import type { EyeballRouterConfig, RouterConfig } from "../../utils/types";
+
+type RequiredEyeballRouterConfig = Required<Exclude<EyeballRouterConfig, null>>;
 
 export const applyConfigurationDefaults = (
-	configuration?: RouterConfig
-): Required<RouterConfig> => {
-	return {
-		invoke_user_worker_ahead_of_assets:
-			configuration?.invoke_user_worker_ahead_of_assets ?? false,
-		has_user_worker: configuration?.has_user_worker ?? false,
-		account_id: configuration?.account_id ?? -1,
-		script_id: configuration?.script_id ?? -1,
-		debug: configuration?.debug ?? false,
-		static_routing: configuration?.static_routing ?? {
-			user_worker: [],
+	configuration?: RouterConfig,
+	eyeballConfiguration?: EyeballRouterConfig
+): [Required<RouterConfig>, RequiredEyeballRouterConfig] => {
+	return [
+		{
+			invoke_user_worker_ahead_of_assets:
+				configuration?.invoke_user_worker_ahead_of_assets ?? false,
+			has_user_worker: configuration?.has_user_worker ?? false,
+			account_id: configuration?.account_id ?? -1,
+			script_id: configuration?.script_id ?? -1,
+			debug: configuration?.debug ?? false,
+			static_routing: configuration?.static_routing ?? {
+				user_worker: [],
+			},
+		},
+		{
+			limitedAssetsOnly: eyeballConfiguration?.limitedAssetsOnly ?? false,
 		},
-	};
+	];
 };

packages/workers-shared/router-worker/src/worker.ts

@@ -6,6 +6,7 @@ import { Analytics, DISPATCH_TYPE, STATIC_ROUTING_DECISION } from "./analytics";
 import { applyConfigurationDefaults } from "./configuration";
 import type AssetWorker from "../../asset-worker";
 import type {
+	EyeballRouterConfig,
 	JaegerTracing,
 	RouterConfig,
 	UnsafePerformanceTimer,
@@ -16,6 +17,7 @@ export interface Env {
 	ASSET_WORKER: Service<AssetWorker>;
 	USER_WORKER: Fetcher;
 	CONFIG: RouterConfig;
+	EYEBALL_CONFIG: EyeballRouterConfig;
 
 	SENTRY_DSN: string;
 	ENVIRONMENT: Environment;
@@ -55,7 +57,10 @@ export default {
 			);
 
 			const hasStaticRouting = env.CONFIG.static_routing !== undefined;
-			const config = applyConfigurationDefaults(env.CONFIG);
+			const [config, eyeballConfig] = applyConfigurationDefaults(
+				env.CONFIG,
+				env.EYEBALL_CONFIG
+			);
 
 			const url = new URL(request.url);
 

packages/workers-shared/router-worker/wrangler.jsonc

@@ -25,6 +25,12 @@
 				"type": "param",
 				"param": "routerConfig",
 			},
+			{
+				"name": "EYEBALL_CONFIG",
+				"type": "param",
+				"param": "eyeballRouterConfig",
+				"optional": true,
+			},
 			{
 				"name": "ASSET_WORKER",
 				"type": "internal_assets",

packages/workers-shared/utils/types.ts

@@ -20,6 +20,13 @@ export const RouterConfigSchema = z.object({
 	...InternalConfigSchema.shape,
 });
 
+export const EyeballRouterConfigSchema = z.union([
+	z.object({
+		limitedAssetsOnly: z.boolean().optional(),
+	}),
+	z.null(),
+]);
+
 const MetadataStaticRedirectEntry = z.object({
 	status: z.number(),
 	to: z.string(),
@@ -79,6 +86,7 @@ export const AssetConfigSchema = z.object({
 	...InternalConfigSchema.shape,
 });
 
+export type EyeballRouterConfig = z.infer<typeof EyeballRouterConfigSchema>;
 export type RouterConfig = z.infer<typeof RouterConfigSchema>;
 export type AssetConfig = z.infer<typeof AssetConfigSchema>;