fix: ensure we honor first-byte-timeout and between-bytes-timeout for dynamically registered backends (#719)

Author: JakeChampion

integration-tests/js-compute/fixtures/app/src/dynamic-backend.js

@@ -1,3 +1,4 @@
+/// <reference path="../../../../../types/index.d.ts" />
 import { Backend } from 'fastly:backend';
 import { CacheOverride } from 'fastly:cache-override';
 import { allowDynamicBackends } from "fastly:experimental";
@@ -6,6 +7,33 @@ import { isRunningLocally, routes } from "./routes.js";
 
 /// The backend name is already in use.
 
+routes.set("/backend/timeout", async () => {
+    if (isRunningLocally()) {
+      return pass('ok')
+    }
+    allowDynamicBackends(true);
+    let backend = new Backend(
+      {
+        name: 'httpme1',
+        target: 'http-me.glitch.me',
+        hostOverride: "http-me.glitch.me",
+        useSSL: true,
+        dontPool: true,
+        betweenBytesTimeout: 1_000,
+        connectTimeout: 1_000,
+        firstByteTimeout: 1_000
+      }
+    );
+    console.time(`fetch('https://http-me.glitch.me/test?wait=5000'`)
+    let error = await assertRejects(() => fetch('https://http-me.glitch.me/test?wait=5000', {
+      backend,
+      cacheOverride: new CacheOverride("pass"),
+    }));
+    console.timeEnd(`fetch('https://http-me.glitch.me/test?wait=5000'`)
+    if (error) { return error }
+    return pass('ok')
+  });
+
 
 // implicit dynamic backend
 {

integration-tests/js-compute/fixtures/app/tests.json

@@ -2131,6 +2131,17 @@
       "body": "ok"
     }
   },
+  "GET /backend/timeout": {
+    "environments": ["compute"],
+    "downstream_request": {
+      "method": "GET",
+      "pathname": "/backend/timeout"
+    },
+    "downstream_response": {
+      "status": 200,
+      "body": "ok"
+    }
+  },
   "GET /implicit-dynamic-backend/dynamic-backends-disabled": {
     "environments": ["viceroy"],
     "downstream_request": {

runtime/js-compute-runtime/host_interface/component/fastly_world_adapter.cpp

@@ -496,17 +496,23 @@ bool fastly_compute_at_edge_http_req_register_dynamic_backend(
     fastly_compute_at_edge_types_error_t *err) {
   uint32_t backend_config_mask = 0;
 
+  if (config->use_ssl.is_some && config->use_ssl.val) {
+    backend_config_mask |= BACKEND_CONFIG_USE_SSL;
+  }
+  if (config->dont_pool.is_some && config->dont_pool.val) {
+    backend_config_mask |= BACKEND_CONFIG_DONT_POOL;
+  }
   if (config->host_override.is_some) {
     backend_config_mask |= BACKEND_CONFIG_HOST_OVERRIDE;
   }
   if (config->connect_timeout.is_some) {
     backend_config_mask |= BACKEND_CONFIG_CONNECT_TIMEOUT;
   }
-  if (config->use_ssl.is_some && config->use_ssl.val) {
-    backend_config_mask |= BACKEND_CONFIG_USE_SSL;
+  if (config->first_byte_timeout.is_some) {
+    backend_config_mask |= BACKEND_CONFIG_FIRST_BYTE_TIMEOUT;
   }
-  if (config->dont_pool.is_some && config->dont_pool.val) {
-    backend_config_mask |= BACKEND_CONFIG_DONT_POOL;
+  if (config->between_bytes_timeout.is_some) {
+    backend_config_mask |= BACKEND_CONFIG_BETWEEN_BYTES_TIMEOUT;
   }
   if (config->ssl_min_version.is_some) {
     backend_config_mask |= BACKEND_CONFIG_SSL_MIN_VERSION;