Bug 1881040 - Propagate RequestPriority when using PFetch. r=edenchuang

This patch makes sure the RequestPriority of the internal request is
propagated to the child process when using PFetch here:
https://searchfox.org/mozilla-central/rev/14ff5b1650123600698f4bb8998ee02b102b8d2f/dom/fetch/Fetch.cpp#632

Note that IPCInternalRequest is also used in ServiceWorkerPrivate when
intercepting a request. However, propagating the RequestPriority of the
intercepted request does not seem desirable, so we just initialize with
PRIORITY_AUTO.

One version of the constructor for InternalRequest is no longer used, so
we just remove it.

Differential Revision: https://phabricator.services.mozilla.com/D210281

dom/fetch/FetchIPCTypes.h

@@ -39,6 +39,10 @@ struct ParamTraits<mozilla::dom::RequestRedirect>
     : public mozilla::dom::WebIDLEnumSerializer<mozilla::dom::RequestRedirect> {
 };
 template <>
+struct ParamTraits<mozilla::dom::RequestPriority>
+    : public mozilla::dom::WebIDLEnumSerializer<mozilla::dom::RequestPriority> {
+};
+template <>
 struct ParamTraits<mozilla::dom::ResponseType>
     : public mozilla::dom::WebIDLEnumSerializer<mozilla::dom::ResponseType> {};
 

dom/fetch/FetchTypes.ipdlh

@@ -15,6 +15,7 @@ using mozilla::dom::ReferrerPolicy from "mozilla/dom/ReferrerPolicyBinding.h";
 using mozilla::dom::RequestCache from "mozilla/dom/RequestBinding.h";
 using mozilla::dom::RequestCredentials from "mozilla/dom/RequestBinding.h";
 using mozilla::dom::RequestRedirect from "mozilla/dom/RequestBinding.h";
+using mozilla::dom::RequestPriority from "mozilla/dom/RequestBinding.h";
 using mozilla::dom::ResponseType from "mozilla/dom/ResponseBinding.h";
 using struct nsID from "nsID.h";
 using mozilla::dom::FetchDriverObserver::EndReason from "mozilla/dom/FetchDriver.h";
@@ -67,6 +68,7 @@ struct IPCInternalRequest {
   RequestCredentials requestCredentials;
   RequestCache cacheMode;
   RequestRedirect requestRedirect;
+  RequestPriority requestPriority;
   nsString integrity;
   nsCString fragment;
   PrincipalInfo? principalInfo;

dom/fetch/InternalRequest.cpp

@@ -98,30 +98,6 @@ InternalRequest::InternalRequest(const nsACString& aURL,
   MOZ_ASSERT(!aURL.IsEmpty());
   AddURL(aURL, aFragment);
 }
-InternalRequest::InternalRequest(
-    const nsACString& aURL, const nsACString& aFragment,
-    const nsACString& aMethod, already_AddRefed<InternalHeaders> aHeaders,
-    RequestCache aCacheMode, RequestMode aMode,
-    RequestRedirect aRequestRedirect, RequestCredentials aRequestCredentials,
-    const nsACString& aReferrer, ReferrerPolicy aReferrerPolicy,
-    RequestPriority aPriority, nsContentPolicyType aContentPolicyType,
-    const nsAString& aIntegrity)
-    : mMethod(aMethod),
-      mHeaders(aHeaders),
-      mBodyLength(InternalResponse::UNKNOWN_BODY_SIZE),
-      mContentPolicyType(aContentPolicyType),
-      mReferrer(aReferrer),
-      mReferrerPolicy(aReferrerPolicy),
-      mEnvironmentReferrerPolicy(ReferrerPolicy::_empty),
-      mMode(aMode),
-      mCredentialsMode(aRequestCredentials),
-      mCacheMode(aCacheMode),
-      mRedirectMode(aRequestRedirect),
-      mPriorityMode(aPriority),
-      mIntegrity(aIntegrity) {
-  MOZ_ASSERT(!aURL.IsEmpty());
-  AddURL(aURL, aFragment);
-}
 InternalRequest::InternalRequest(const InternalRequest& aOther,
                                  ConstructorGuard)
     : mMethod(aOther.mMethod),
@@ -178,6 +154,7 @@ InternalRequest::InternalRequest(const IPCInternalRequest& aIPCRequest)
       mCredentialsMode(aIPCRequest.requestCredentials()),
       mCacheMode(aIPCRequest.cacheMode()),
       mRedirectMode(aIPCRequest.requestRedirect()),
+      mPriorityMode(aIPCRequest.requestPriority()),
       mIntegrity(aIPCRequest.integrity()),
       mFragment(aIPCRequest.fragment()),
       mEmbedderPolicy(aIPCRequest.embedderPolicy()),
@@ -227,6 +204,7 @@ void InternalRequest::ToIPCInternalRequest(
   aIPCRequest->requestCredentials() = mCredentialsMode;
   aIPCRequest->cacheMode() = mCacheMode;
   aIPCRequest->requestRedirect() = mRedirectMode;
+  aIPCRequest->requestPriority() = mPriorityMode;
   aIPCRequest->integrity() = mIntegrity;
   aIPCRequest->fragment() = mFragment;
   aIPCRequest->embedderPolicy() = mEmbedderPolicy;

dom/fetch/InternalRequest.h

@@ -87,16 +87,6 @@ class InternalRequest final : public AtomicSafeRefCounted<InternalRequest> {
  public:
   MOZ_DECLARE_REFCOUNTED_TYPENAME(InternalRequest)
   InternalRequest(const nsACString& aURL, const nsACString& aFragment);
-  InternalRequest(const nsACString& aURL, const nsACString& aFragment,
-                  const nsACString& aMethod,
-                  already_AddRefed<InternalHeaders> aHeaders,
-                  RequestCache aCacheMode, RequestMode aMode,
-                  RequestRedirect aRequestRedirect,
-                  RequestCredentials aRequestCredentials,
-                  const nsACString& aReferrer, ReferrerPolicy aReferrerPolicy,
-                  RequestPriority aPriority,
-                  nsContentPolicyType aContentPolicyType,
-                  const nsAString& aIntegrity);
 
   explicit InternalRequest(const IPCInternalRequest& aIPCRequest);
 

dom/serviceworkers/ServiceWorkerPrivate.cpp

@@ -322,6 +322,14 @@ Result<IPCInternalRequest, nsresult> GetIPCInternalRequest(
   MOZ_ALWAYS_SUCCEEDS(internalChannel->GetRedirectMode(&redirectMode));
   RequestRedirect requestRedirect = static_cast<RequestRedirect>(redirectMode);
 
+  // request's priority is not copied by the new Request() constructor used by
+  // a fetch() call while request's internal priority is. So let's use the
+  // default, otherwise a fetch(event.request) from a worker on an intercepted
+  // fetch event would adjust priority twice.
+  // https://fetch.spec.whatwg.org/#dom-global-fetch
+  // https://fetch.spec.whatwg.org/#dom-request
+  RequestPriority requestPriority = RequestPriority::Auto;
+
   RequestCredentials requestCredentials =
       InternalRequest::MapChannelToRequestCredentials(underlyingChannel);
 
@@ -411,9 +419,9 @@ Result<IPCInternalRequest, nsresult> GetIPCInternalRequest(
       method, {spec}, ipcHeadersGuard, ipcHeaders, Nothing(), -1,
       alternativeDataType, contentPolicyType, internalPriority, referrer,
       referrerPolicy, environmentReferrerPolicy, requestMode,
-      requestCredentials, cacheMode, requestRedirect, integrity, fragment,
-      principalInfo, interceptionPrincipalInfo, contentPolicyType,
-      redirectChain, isThirdPartyChannel, embedderPolicy);
+      requestCredentials, cacheMode, requestRedirect, requestPriority,
+      integrity, fragment, principalInfo, interceptionPrincipalInfo,
+      contentPolicyType, redirectChain, isThirdPartyChannel, embedderPolicy);
 }
 
 nsresult MaybeStoreStreamForBackgroundThread(nsIInterceptedChannel* aChannel,