gecko-dev/dom/cache/AutoUtils.cpp

631 lines
19 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/cache/AutoUtils.h"
#include "mozilla/unused.h"
#include "mozilla/dom/InternalHeaders.h"
#include "mozilla/dom/InternalRequest.h"
#include "mozilla/dom/cache/CacheParent.h"
#include "mozilla/dom/cache/CachePushStreamChild.h"
#include "mozilla/dom/cache/CacheStreamControlParent.h"
#include "mozilla/dom/cache/ReadStream.h"
#include "mozilla/dom/cache/SavedTypes.h"
#include "mozilla/dom/cache/StreamList.h"
#include "mozilla/dom/cache/TypeUtils.h"
#include "mozilla/ipc/FileDescriptorSetChild.h"
#include "mozilla/ipc/FileDescriptorSetParent.h"
#include "mozilla/ipc/PBackgroundParent.h"
#include "nsCRT.h"
#include "nsHttp.h"
namespace {
using mozilla::Unused;
using mozilla::dom::cache::CachePushStreamChild;
using mozilla::dom::cache::CacheReadStream;
using mozilla::dom::cache::CacheReadStreamOrVoid;
using mozilla::ipc::FileDescriptor;
using mozilla::ipc::FileDescriptorSetChild;
using mozilla::ipc::FileDescriptorSetParent;
using mozilla::ipc::OptionalFileDescriptorSet;
enum CleanupAction
{
Forget,
Delete
};
void
CleanupChildFds(CacheReadStream& aReadStream, CleanupAction aAction)
{
if (aReadStream.fds().type() !=
OptionalFileDescriptorSet::TPFileDescriptorSetChild) {
return;
}
AutoTArray<FileDescriptor, 4> fds;
FileDescriptorSetChild* fdSetActor =
static_cast<FileDescriptorSetChild*>(aReadStream.fds().get_PFileDescriptorSetChild());
MOZ_ASSERT(fdSetActor);
if (aAction == Delete) {
Unused << fdSetActor->Send__delete__(fdSetActor);
}
// FileDescriptorSet doesn't clear its fds in its ActorDestroy, so we
// unconditionally forget them here. The fds themselves are auto-closed in
// ~FileDescriptor since they originated in this process.
fdSetActor->ForgetFileDescriptors(fds);
}
void
CleanupChildPushStream(CacheReadStream& aReadStream, CleanupAction aAction)
{
if (!aReadStream.pushStreamChild()) {
return;
}
auto pushStream =
static_cast<CachePushStreamChild*>(aReadStream.pushStreamChild());
if (aAction == Delete) {
pushStream->StartDestroy();
return;
}
// If we send the stream, then we need to start it before forgetting about it.
pushStream->Start();
}
void
CleanupChild(CacheReadStream& aReadStream, CleanupAction aAction)
{
CleanupChildFds(aReadStream, aAction);
CleanupChildPushStream(aReadStream, aAction);
}
void
CleanupChild(CacheReadStreamOrVoid& aReadStreamOrVoid, CleanupAction aAction)
{
if (aReadStreamOrVoid.type() == CacheReadStreamOrVoid::Tvoid_t) {
return;
}
CleanupChild(aReadStreamOrVoid.get_CacheReadStream(), aAction);
}
void
CleanupParentFds(CacheReadStream& aReadStream, CleanupAction aAction)
{
if (aReadStream.fds().type() !=
OptionalFileDescriptorSet::TPFileDescriptorSetParent) {
return;
}
AutoTArray<FileDescriptor, 4> fds;
FileDescriptorSetParent* fdSetActor =
static_cast<FileDescriptorSetParent*>(aReadStream.fds().get_PFileDescriptorSetParent());
MOZ_ASSERT(fdSetActor);
if (aAction == Delete) {
Unused << fdSetActor->Send__delete__(fdSetActor);
}
// FileDescriptorSet doesn't clear its fds in its ActorDestroy, so we
// unconditionally forget them here. The fds themselves are auto-closed in
// ~FileDescriptor since they originated in this process.
fdSetActor->ForgetFileDescriptors(fds);
}
void
CleanupParentFds(CacheReadStreamOrVoid& aReadStreamOrVoid, CleanupAction aAction)
{
if (aReadStreamOrVoid.type() == CacheReadStreamOrVoid::Tvoid_t) {
return;
}
CleanupParentFds(aReadStreamOrVoid.get_CacheReadStream(), aAction);
}
} // namespace
namespace mozilla {
namespace dom {
namespace cache {
using mozilla::ipc::PBackgroundParent;
// --------------------------------------------
AutoChildOpArgs::AutoChildOpArgs(TypeUtils* aTypeUtils,
const CacheOpArgs& aOpArgs)
: mTypeUtils(aTypeUtils)
, mOpArgs(aOpArgs)
, mSent(false)
{
MOZ_ASSERT(mTypeUtils);
}
AutoChildOpArgs::~AutoChildOpArgs()
{
CleanupAction action = mSent ? Forget : Delete;
switch(mOpArgs.type()) {
case CacheOpArgs::TCacheMatchArgs:
{
CacheMatchArgs& args = mOpArgs.get_CacheMatchArgs();
CleanupChild(args.request().body(), action);
break;
}
case CacheOpArgs::TCacheMatchAllArgs:
{
CacheMatchAllArgs& args = mOpArgs.get_CacheMatchAllArgs();
if (args.requestOrVoid().type() == CacheRequestOrVoid::Tvoid_t) {
break;
}
CleanupChild(args.requestOrVoid().get_CacheRequest().body(), action);
break;
}
case CacheOpArgs::TCachePutAllArgs:
{
CachePutAllArgs& args = mOpArgs.get_CachePutAllArgs();
auto& list = args.requestResponseList();
for (uint32_t i = 0; i < list.Length(); ++i) {
CleanupChild(list[i].request().body(), action);
CleanupChild(list[i].response().body(), action);
}
break;
}
case CacheOpArgs::TCacheDeleteArgs:
{
CacheDeleteArgs& args = mOpArgs.get_CacheDeleteArgs();
CleanupChild(args.request().body(), action);
break;
}
case CacheOpArgs::TCacheKeysArgs:
{
CacheKeysArgs& args = mOpArgs.get_CacheKeysArgs();
if (args.requestOrVoid().type() == CacheRequestOrVoid::Tvoid_t) {
break;
}
CleanupChild(args.requestOrVoid().get_CacheRequest().body(), action);
break;
}
case CacheOpArgs::TStorageMatchArgs:
{
StorageMatchArgs& args = mOpArgs.get_StorageMatchArgs();
CleanupChild(args.request().body(), action);
break;
}
default:
// Other types do not need cleanup
break;
}
}
void
AutoChildOpArgs::Add(InternalRequest* aRequest, BodyAction aBodyAction,
SchemeAction aSchemeAction, ErrorResult& aRv)
{
MOZ_ASSERT(!mSent);
switch(mOpArgs.type()) {
case CacheOpArgs::TCacheMatchArgs:
{
CacheMatchArgs& args = mOpArgs.get_CacheMatchArgs();
mTypeUtils->ToCacheRequest(args.request(), aRequest, aBodyAction,
aSchemeAction, aRv);
break;
}
case CacheOpArgs::TCacheMatchAllArgs:
{
CacheMatchAllArgs& args = mOpArgs.get_CacheMatchAllArgs();
MOZ_ASSERT(args.requestOrVoid().type() == CacheRequestOrVoid::Tvoid_t);
args.requestOrVoid() = CacheRequest();
mTypeUtils->ToCacheRequest(args.requestOrVoid().get_CacheRequest(),
aRequest, aBodyAction, aSchemeAction, aRv);
break;
}
case CacheOpArgs::TCacheDeleteArgs:
{
CacheDeleteArgs& args = mOpArgs.get_CacheDeleteArgs();
mTypeUtils->ToCacheRequest(args.request(), aRequest, aBodyAction,
aSchemeAction, aRv);
break;
}
case CacheOpArgs::TCacheKeysArgs:
{
CacheKeysArgs& args = mOpArgs.get_CacheKeysArgs();
MOZ_ASSERT(args.requestOrVoid().type() == CacheRequestOrVoid::Tvoid_t);
args.requestOrVoid() = CacheRequest();
mTypeUtils->ToCacheRequest(args.requestOrVoid().get_CacheRequest(),
aRequest, aBodyAction, aSchemeAction, aRv);
break;
}
case CacheOpArgs::TStorageMatchArgs:
{
StorageMatchArgs& args = mOpArgs.get_StorageMatchArgs();
mTypeUtils->ToCacheRequest(args.request(), aRequest, aBodyAction,
aSchemeAction, aRv);
break;
}
default:
MOZ_CRASH("Cache args type cannot send a Request!");
}
}
namespace {
bool
MatchInPutList(InternalRequest* aRequest,
const nsTArray<CacheRequestResponse>& aPutList)
{
MOZ_ASSERT(aRequest);
// This method implements the SW spec QueryCache algorithm against an
// in memory array of Request/Response objects. This essentially the
// same algorithm that is implemented in DBSchema.cpp. Unfortunately
// we cannot unify them because when operating against the real database
// we don't want to load all request/response objects into memory.
// Note, we can skip the check for a invalid request method because
// Cache should only call into here with a GET or HEAD.
#ifdef DEBUG
nsAutoCString method;
aRequest->GetMethod(method);
MOZ_ASSERT(method.LowerCaseEqualsLiteral("get") ||
method.LowerCaseEqualsLiteral("head"));
#endif
RefPtr<InternalHeaders> requestHeaders = aRequest->Headers();
for (uint32_t i = 0; i < aPutList.Length(); ++i) {
const CacheRequest& cachedRequest = aPutList[i].request();
const CacheResponse& cachedResponse = aPutList[i].response();
nsAutoCString url;
aRequest->GetURL(url);
nsAutoCString requestUrl(cachedRequest.urlWithoutQuery());
requestUrl.Append(cachedRequest.urlQuery());
// If the URLs don't match, then just skip to the next entry.
if (url != requestUrl) {
continue;
}
RefPtr<InternalHeaders> cachedRequestHeaders =
TypeUtils::ToInternalHeaders(cachedRequest.headers());
RefPtr<InternalHeaders> cachedResponseHeaders =
TypeUtils::ToInternalHeaders(cachedResponse.headers());
AutoTArray<nsCString, 16> varyHeaders;
ErrorResult rv;
cachedResponseHeaders->GetAll(NS_LITERAL_CSTRING("vary"), varyHeaders, rv);
MOZ_ALWAYS_TRUE(!rv.Failed());
// Assume the vary headers match until we find a conflict
bool varyHeadersMatch = true;
for (uint32_t j = 0; j < varyHeaders.Length(); ++j) {
// Extract the header names inside the Vary header value.
nsAutoCString varyValue(varyHeaders[j]);
char* rawBuffer = varyValue.BeginWriting();
char* token = nsCRT::strtok(rawBuffer, NS_HTTP_HEADER_SEPS, &rawBuffer);
bool bailOut = false;
for (; token;
token = nsCRT::strtok(rawBuffer, NS_HTTP_HEADER_SEPS, &rawBuffer)) {
nsDependentCString header(token);
MOZ_ASSERT(!header.EqualsLiteral("*"),
"We should have already caught this in "
"TypeUtils::ToPCacheResponseWithoutBody()");
ErrorResult headerRv;
nsAutoCString value;
requestHeaders->Get(header, value, headerRv);
if (NS_WARN_IF(headerRv.Failed())) {
headerRv.SuppressException();
MOZ_ASSERT(value.IsEmpty());
}
nsAutoCString cachedValue;
cachedRequestHeaders->Get(header, value, headerRv);
if (NS_WARN_IF(headerRv.Failed())) {
headerRv.SuppressException();
MOZ_ASSERT(cachedValue.IsEmpty());
}
if (value != cachedValue) {
varyHeadersMatch = false;
bailOut = true;
break;
}
}
if (bailOut) {
break;
}
}
// URL was equal and all vary headers match!
if (varyHeadersMatch) {
return true;
}
}
return false;
}
} // namespace
void
AutoChildOpArgs::Add(InternalRequest* aRequest, BodyAction aBodyAction,
SchemeAction aSchemeAction, Response& aResponse,
ErrorResult& aRv)
{
MOZ_ASSERT(!mSent);
switch(mOpArgs.type()) {
case CacheOpArgs::TCachePutAllArgs:
{
CachePutAllArgs& args = mOpArgs.get_CachePutAllArgs();
// Throw an error if a request/response pair would mask another
// request/response pair in the same PutAll operation. This is
// step 2.3.2.3 from the "Batch Cache Operations" spec algorithm.
if (MatchInPutList(aRequest, args.requestResponseList())) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
// The FileDescriptorSetChild asserts in its destructor that all fds have
// been removed. The copy constructor, however, simply duplicates the
// fds without removing any. This means each temporary and copy must be
// explicitly cleaned up.
//
// Avoid a lot of this hassle by making sure we only create one here. On
// error we remove it.
CacheRequestResponse& pair = *args.requestResponseList().AppendElement();
pair.request().body() = void_t();
pair.response().body() = void_t();
mTypeUtils->ToCacheRequest(pair.request(), aRequest, aBodyAction,
aSchemeAction, aRv);
if (!aRv.Failed()) {
mTypeUtils->ToCacheResponse(pair.response(), aResponse, aRv);
}
if (aRv.Failed()) {
CleanupChild(pair.request().body(), Delete);
args.requestResponseList().RemoveElementAt(
args.requestResponseList().Length() - 1);
}
break;
}
default:
MOZ_CRASH("Cache args type cannot send a Request/Response pair!");
}
}
const CacheOpArgs&
AutoChildOpArgs::SendAsOpArgs()
{
MOZ_ASSERT(!mSent);
mSent = true;
return mOpArgs;
}
// --------------------------------------------
AutoParentOpResult::AutoParentOpResult(mozilla::ipc::PBackgroundParent* aManager,
const CacheOpResult& aOpResult)
: mManager(aManager)
, mOpResult(aOpResult)
, mStreamControl(nullptr)
, mSent(false)
{
MOZ_ASSERT(mManager);
}
AutoParentOpResult::~AutoParentOpResult()
{
CleanupAction action = mSent ? Forget : Delete;
switch (mOpResult.type()) {
case CacheOpResult::TCacheMatchResult:
{
CacheMatchResult& result = mOpResult.get_CacheMatchResult();
if (result.responseOrVoid().type() == CacheResponseOrVoid::Tvoid_t) {
break;
}
CleanupParentFds(result.responseOrVoid().get_CacheResponse().body(),
action);
break;
}
case CacheOpResult::TCacheMatchAllResult:
{
CacheMatchAllResult& result = mOpResult.get_CacheMatchAllResult();
for (uint32_t i = 0; i < result.responseList().Length(); ++i) {
CleanupParentFds(result.responseList()[i].body(), action);
}
break;
}
case CacheOpResult::TCacheKeysResult:
{
CacheKeysResult& result = mOpResult.get_CacheKeysResult();
for (uint32_t i = 0; i < result.requestList().Length(); ++i) {
CleanupParentFds(result.requestList()[i].body(), action);
}
break;
}
case CacheOpResult::TStorageMatchResult:
{
StorageMatchResult& result = mOpResult.get_StorageMatchResult();
if (result.responseOrVoid().type() == CacheResponseOrVoid::Tvoid_t) {
break;
}
CleanupParentFds(result.responseOrVoid().get_CacheResponse().body(),
action);
break;
}
case CacheOpResult::TStorageOpenResult:
{
StorageOpenResult& result = mOpResult.get_StorageOpenResult();
if (action == Forget || result.actorParent() == nullptr) {
break;
}
Unused << PCacheParent::Send__delete__(result.actorParent());
break;
}
default:
// other types do not need clean up
break;
}
if (action == Delete && mStreamControl) {
Unused << PCacheStreamControlParent::Send__delete__(mStreamControl);
}
}
void
AutoParentOpResult::Add(CacheId aOpenedCacheId, Manager* aManager)
{
MOZ_ASSERT(mOpResult.type() == CacheOpResult::TStorageOpenResult);
MOZ_ASSERT(mOpResult.get_StorageOpenResult().actorParent() == nullptr);
mOpResult.get_StorageOpenResult().actorParent() =
mManager->SendPCacheConstructor(new CacheParent(aManager, aOpenedCacheId));
}
void
AutoParentOpResult::Add(const SavedResponse& aSavedResponse,
StreamList* aStreamList)
{
MOZ_ASSERT(!mSent);
switch (mOpResult.type()) {
case CacheOpResult::TCacheMatchResult:
{
CacheMatchResult& result = mOpResult.get_CacheMatchResult();
MOZ_ASSERT(result.responseOrVoid().type() == CacheResponseOrVoid::Tvoid_t);
result.responseOrVoid() = aSavedResponse.mValue;
SerializeResponseBody(aSavedResponse, aStreamList,
&result.responseOrVoid().get_CacheResponse());
break;
}
case CacheOpResult::TCacheMatchAllResult:
{
CacheMatchAllResult& result = mOpResult.get_CacheMatchAllResult();
result.responseList().AppendElement(aSavedResponse.mValue);
SerializeResponseBody(aSavedResponse, aStreamList,
&result.responseList().LastElement());
break;
}
case CacheOpResult::TStorageMatchResult:
{
StorageMatchResult& result = mOpResult.get_StorageMatchResult();
MOZ_ASSERT(result.responseOrVoid().type() == CacheResponseOrVoid::Tvoid_t);
result.responseOrVoid() = aSavedResponse.mValue;
SerializeResponseBody(aSavedResponse, aStreamList,
&result.responseOrVoid().get_CacheResponse());
break;
}
default:
MOZ_CRASH("Cache result type cannot handle returning a Response!");
}
}
void
AutoParentOpResult::Add(const SavedRequest& aSavedRequest,
StreamList* aStreamList)
{
MOZ_ASSERT(!mSent);
switch (mOpResult.type()) {
case CacheOpResult::TCacheKeysResult:
{
CacheKeysResult& result = mOpResult.get_CacheKeysResult();
result.requestList().AppendElement(aSavedRequest.mValue);
CacheRequest& request = result.requestList().LastElement();
if (!aSavedRequest.mHasBodyId) {
request.body() = void_t();
break;
}
request.body() = CacheReadStream();
SerializeReadStream(aSavedRequest.mBodyId, aStreamList,
&request.body().get_CacheReadStream());
break;
}
default:
MOZ_CRASH("Cache result type cannot handle returning a Request!");
}
}
const CacheOpResult&
AutoParentOpResult::SendAsOpResult()
{
MOZ_ASSERT(!mSent);
mSent = true;
return mOpResult;
}
void
AutoParentOpResult::SerializeResponseBody(const SavedResponse& aSavedResponse,
StreamList* aStreamList,
CacheResponse* aResponseOut)
{
MOZ_ASSERT(aResponseOut);
if (!aSavedResponse.mHasBodyId) {
aResponseOut->body() = void_t();
return;
}
aResponseOut->body() = CacheReadStream();
SerializeReadStream(aSavedResponse.mBodyId, aStreamList,
&aResponseOut->body().get_CacheReadStream());
}
void
AutoParentOpResult::SerializeReadStream(const nsID& aId, StreamList* aStreamList,
CacheReadStream* aReadStreamOut)
{
MOZ_ASSERT(aStreamList);
MOZ_ASSERT(aReadStreamOut);
MOZ_ASSERT(!mSent);
nsCOMPtr<nsIInputStream> stream = aStreamList->Extract(aId);
MOZ_ASSERT(stream);
if (!mStreamControl) {
mStreamControl = static_cast<CacheStreamControlParent*>(
mManager->SendPCacheStreamControlConstructor(new CacheStreamControlParent()));
// If this failed, then the child process is gone. Warn and allow actor
// cleanup to proceed as normal.
if (!mStreamControl) {
NS_WARNING("Cache failed to create stream control actor.");
return;
}
}
aStreamList->SetStreamControl(mStreamControl);
RefPtr<ReadStream> readStream = ReadStream::Create(mStreamControl,
aId, stream);
readStream->Serialize(aReadStreamOut);
}
} // namespace cache
} // namespace dom
} // namespace mozilla