chromium/src/third_party/blink/renderer/modules/service_worker/service_worker_module_tree_client.cc

// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "third_party/blink/renderer/modules/service_worker/service_worker_module_tree_client.h"

#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/inspector/console_message.h"
#include "third_party/blink/renderer/core/script/module_script.h"
#include "third_party/blink/renderer/core/workers/worker_global_scope.h"
#include "third_party/blink/renderer/core/workers/worker_reporting_proxy.h"

namespace blink {

ServiceWorkerModuleTreeClient::ServiceWorkerModuleTreeClient(
    ScriptState* script_state)
    : script_state_(script_state) {}

// This client is used for both new and installed scripts. In the new scripts
// case, this is a partial implementation of the custom "perform the fetch" hook
// in the spec: https://w3c.github.io/ServiceWorker/#update-algorithm For
// installed scripts, there is no corresponding specification text because there
// is no fetching process there. The service worker simply uses its associated
// script resource.
void ServiceWorkerModuleTreeClient::NotifyModuleTreeLoadFinished(
    ModuleScript* module_script) {
  auto* worker_global_scope =
      To<WorkerGlobalScope>(ExecutionContext::From(script_state_));
  blink::WorkerReportingProxy& worker_reporting_proxy =
      worker_global_scope->ReportingProxy();

  if (!module_script) {
    // (In the update case) Step 9: "If the algorithm asynchronously completes
    // with null, then: Invoke Reject Job Promise with job and TypeError."
    // DidFailToFetchModuleScript() signals that startup failed, which causes
    // ServiceWorkerRegisterJob to reject the job promise.
    worker_reporting_proxy.DidFailToFetchModuleScript();
    worker_global_scope->close();
    return;
  }

  // With top-level await: https://github.com/w3c/ServiceWorker/pull/1444
  if (!module_script->HasEmptyRecord() &&
      module_script->V8Module()->IsGraphAsync()) {
    worker_reporting_proxy.DidFailToFetchModuleScript();
    worker_global_scope->AddConsoleMessage(MakeGarbageCollected<ConsoleMessage>(
        mojom::blink::ConsoleMessageSource::kJavaScript,
        mojom::blink::ConsoleMessageLevel::kError,
        "Top-level await is disallowed in service workers."));
    worker_global_scope->close();
    return;
  }

  worker_reporting_proxy.DidFetchScript();

  // (In the update case) Step 9: "Else, continue the rest of these steps after
  // the algorithm's asynchronous completion, with script being the asynchronous
  // completion value."
  worker_global_scope->WorkerScriptFetchFinished(
      *module_script, base::nullopt /* v8_inspector::V8StackTraceId */);
}

void ServiceWorkerModuleTreeClient::Trace(Visitor* visitor) const {
  visitor->Trace(script_state_);
  ModuleTreeClient::Trace(visitor);
}

}  // namespace blink