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gecko-dev/uriloader/prefetch/nsPrefetchService.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsPrefetchService.h"
#include "nsICacheEntry.h"
#include "nsIServiceManager.h"
#include "nsICategoryManager.h"
#include "nsIObserverService.h"
#include "nsIWebProgress.h"
#include "nsCURILoader.h"
#include "nsICacheInfoChannel.h"
#include "nsIHttpChannel.h"
#include "nsIURL.h"
#include "nsISimpleEnumerator.h"
#include "nsNetUtil.h"
#include "nsString.h"
#include "nsXPIDLString.h"
#include "nsReadableUtils.h"
#include "nsStreamUtils.h"
#include "nsAutoPtr.h"
#include "prtime.h"
#include "mozilla/Logging.h"
#include "plstr.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "mozilla/Preferences.h"
#include "mozilla/Attributes.h"
#include "nsIDOMNode.h"
#include "nsINode.h"
#include "nsIDocument.h"
#include "nsContentUtils.h"
using namespace mozilla;
//
// To enable logging (see prlog.h for full details):
//
// set NSPR_LOG_MODULES=nsPrefetch:5
// set NSPR_LOG_FILE=prefetch.log
//
// this enables LogLevel::Debug level information and places all output in
// the file http.log
//
static PRLogModuleInfo *gPrefetchLog;
#undef LOG
#define LOG(args) MOZ_LOG(gPrefetchLog, mozilla::LogLevel::Debug, args)
#undef LOG_ENABLED
#define LOG_ENABLED() MOZ_LOG_TEST(gPrefetchLog, mozilla::LogLevel::Debug)
#define PREFETCH_PREF "network.prefetch-next"
//-----------------------------------------------------------------------------
// helpers
//-----------------------------------------------------------------------------
static inline uint32_t
PRTimeToSeconds(PRTime t_usec)
{
PRTime usec_per_sec = PR_USEC_PER_SEC;
return uint32_t(t_usec /= usec_per_sec);
}
#define NowInSeconds() PRTimeToSeconds(PR_Now())
//-----------------------------------------------------------------------------
// nsPrefetchQueueEnumerator
//-----------------------------------------------------------------------------
class nsPrefetchQueueEnumerator final : public nsISimpleEnumerator
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSISIMPLEENUMERATOR
explicit nsPrefetchQueueEnumerator(nsPrefetchService *aService);
private:
~nsPrefetchQueueEnumerator();
void Increment();
nsRefPtr<nsPrefetchService> mService;
nsRefPtr<nsPrefetchNode> mCurrent;
bool mStarted;
};
//-----------------------------------------------------------------------------
// nsPrefetchQueueEnumerator <public>
//-----------------------------------------------------------------------------
nsPrefetchQueueEnumerator::nsPrefetchQueueEnumerator(nsPrefetchService *aService)
: mService(aService)
, mStarted(false)
{
Increment();
}
nsPrefetchQueueEnumerator::~nsPrefetchQueueEnumerator()
{
}
//-----------------------------------------------------------------------------
// nsPrefetchQueueEnumerator::nsISimpleEnumerator
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsPrefetchQueueEnumerator::HasMoreElements(bool *aHasMore)
{
*aHasMore = (mCurrent != nullptr);
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchQueueEnumerator::GetNext(nsISupports **aItem)
{
if (!mCurrent) return NS_ERROR_FAILURE;
NS_ADDREF(*aItem = static_cast<nsIStreamListener*>(mCurrent.get()));
Increment();
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsPrefetchQueueEnumerator <private>
//-----------------------------------------------------------------------------
void
nsPrefetchQueueEnumerator::Increment()
{
if (!mStarted) {
// If the service is currently serving a request, it won't be in
// the pending queue, so we return it first. If it isn't, we'll
// just start with the pending queue.
mStarted = true;
mCurrent = mService->GetCurrentNode();
if (!mCurrent)
mCurrent = mService->GetQueueHead();
return;
}
if (mCurrent) {
if (mCurrent == mService->GetCurrentNode()) {
// If we just returned the node being processed by the service,
// start with the pending queue
mCurrent = mService->GetQueueHead();
}
else {
// Otherwise just advance to the next item in the queue
mCurrent = mCurrent->mNext;
}
}
}
//-----------------------------------------------------------------------------
// nsPrefetchQueueEnumerator::nsISupports
//-----------------------------------------------------------------------------
NS_IMPL_ISUPPORTS(nsPrefetchQueueEnumerator, nsISimpleEnumerator)
//-----------------------------------------------------------------------------
// nsPrefetchNode <public>
//-----------------------------------------------------------------------------
nsPrefetchNode::nsPrefetchNode(nsPrefetchService *aService,
nsIURI *aURI,
nsIURI *aReferrerURI,
nsIDOMNode *aSource)
: mNext(nullptr)
, mURI(aURI)
, mReferrerURI(aReferrerURI)
, mService(aService)
, mChannel(nullptr)
, mBytesRead(0)
{
mSource = do_GetWeakReference(aSource);
}
nsresult
nsPrefetchNode::OpenChannel()
{
nsCOMPtr<nsINode> source = do_QueryReferent(mSource);
if (!source) {
// Don't attempt to prefetch if we don't have a source node
// (which should never happen).
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsILoadGroup> loadGroup = source->OwnerDoc()->GetDocumentLoadGroup();
nsresult rv = NS_NewChannelInternal(getter_AddRefs(mChannel),
mURI,
source,
source->NodePrincipal(),
nullptr, //aTriggeringPrincipal
nsILoadInfo::SEC_NORMAL,
nsIContentPolicy::TYPE_OTHER,
loadGroup, // aLoadGroup
this, // aCallbacks
nsIRequest::LOAD_BACKGROUND |
nsICachingChannel::LOAD_ONLY_IF_MODIFIED);
NS_ENSURE_SUCCESS(rv, rv);
// configure HTTP specific stuff
nsCOMPtr<nsIHttpChannel> httpChannel =
do_QueryInterface(mChannel);
if (httpChannel) {
httpChannel->SetReferrer(mReferrerURI);
httpChannel->SetRequestHeader(
NS_LITERAL_CSTRING("X-Moz"),
NS_LITERAL_CSTRING("prefetch"),
false);
}
rv = mChannel->AsyncOpen(this, nullptr);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
nsPrefetchNode::CancelChannel(nsresult error)
{
mChannel->Cancel(error);
mChannel = nullptr;
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsPrefetchNode::nsISupports
//-----------------------------------------------------------------------------
NS_IMPL_ISUPPORTS(nsPrefetchNode,
nsIRequestObserver,
nsIStreamListener,
nsIInterfaceRequestor,
nsIChannelEventSink,
nsIRedirectResultListener)
//-----------------------------------------------------------------------------
// nsPrefetchNode::nsIStreamListener
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsPrefetchNode::OnStartRequest(nsIRequest *aRequest,
nsISupports *aContext)
{
nsresult rv;
nsCOMPtr<nsICacheInfoChannel> cacheInfoChannel =
do_QueryInterface(aRequest, &rv);
if (NS_FAILED(rv)) return rv;
// no need to prefetch a document that is already in the cache
bool fromCache;
if (NS_SUCCEEDED(cacheInfoChannel->IsFromCache(&fromCache)) &&
fromCache) {
LOG(("document is already in the cache; canceling prefetch\n"));
return NS_BINDING_ABORTED;
}
//
// no need to prefetch a document that must be requested fresh each
// and every time.
//
uint32_t expTime;
if (NS_SUCCEEDED(cacheInfoChannel->GetCacheTokenExpirationTime(&expTime))) {
if (NowInSeconds() >= expTime) {
LOG(("document cannot be reused from cache; "
"canceling prefetch\n"));
return NS_BINDING_ABORTED;
}
}
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchNode::OnDataAvailable(nsIRequest *aRequest,
nsISupports *aContext,
nsIInputStream *aStream,
uint64_t aOffset,
uint32_t aCount)
{
uint32_t bytesRead = 0;
aStream->ReadSegments(NS_DiscardSegment, nullptr, aCount, &bytesRead);
mBytesRead += bytesRead;
LOG(("prefetched %u bytes [offset=%llu]\n", bytesRead, aOffset));
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchNode::OnStopRequest(nsIRequest *aRequest,
nsISupports *aContext,
nsresult aStatus)
{
LOG(("done prefetching [status=%x]\n", aStatus));
if (mBytesRead == 0 && aStatus == NS_OK) {
// we didn't need to read (because LOAD_ONLY_IF_MODIFIED was
// specified), but the object should report loadedSize as if it
// did.
mChannel->GetContentLength(&mBytesRead);
}
mService->NotifyLoadCompleted(this);
mService->ProcessNextURI();
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsPrefetchNode::nsIInterfaceRequestor
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsPrefetchNode::GetInterface(const nsIID &aIID, void **aResult)
{
if (aIID.Equals(NS_GET_IID(nsIChannelEventSink))) {
NS_ADDREF_THIS();
*aResult = static_cast<nsIChannelEventSink *>(this);
return NS_OK;
}
if (aIID.Equals(NS_GET_IID(nsIRedirectResultListener))) {
NS_ADDREF_THIS();
*aResult = static_cast<nsIRedirectResultListener *>(this);
return NS_OK;
}
return NS_ERROR_NO_INTERFACE;
}
//-----------------------------------------------------------------------------
// nsPrefetchNode::nsIChannelEventSink
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsPrefetchNode::AsyncOnChannelRedirect(nsIChannel *aOldChannel,
nsIChannel *aNewChannel,
uint32_t aFlags,
nsIAsyncVerifyRedirectCallback *callback)
{
nsCOMPtr<nsIURI> newURI;
nsresult rv = aNewChannel->GetURI(getter_AddRefs(newURI));
if (NS_FAILED(rv))
return rv;
bool match;
rv = newURI->SchemeIs("http", &match);
if (NS_FAILED(rv) || !match) {
rv = newURI->SchemeIs("https", &match);
if (NS_FAILED(rv) || !match) {
LOG(("rejected: URL is not of type http/https\n"));
return NS_ERROR_ABORT;
}
}
// HTTP request headers are not automatically forwarded to the new channel.
nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aNewChannel);
NS_ENSURE_STATE(httpChannel);
httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("X-Moz"),
NS_LITERAL_CSTRING("prefetch"),
false);
// Assign to mChannel after we get notification about success of the
// redirect in OnRedirectResult.
mRedirectChannel = aNewChannel;
callback->OnRedirectVerifyCallback(NS_OK);
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsPrefetchNode::nsIRedirectResultListener
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsPrefetchNode::OnRedirectResult(bool proceeding)
{
if (proceeding && mRedirectChannel)
mChannel = mRedirectChannel;
mRedirectChannel = nullptr;
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsPrefetchService <public>
//-----------------------------------------------------------------------------
nsPrefetchService::nsPrefetchService()
: mQueueHead(nullptr)
, mQueueTail(nullptr)
, mStopCount(0)
, mHaveProcessed(false)
, mDisabled(true)
{
}
nsPrefetchService::~nsPrefetchService()
{
Preferences::RemoveObserver(this, PREFETCH_PREF);
// cannot reach destructor if prefetch in progress (listener owns reference
// to this service)
EmptyQueue();
}
nsresult
nsPrefetchService::Init()
{
if (!gPrefetchLog)
gPrefetchLog = PR_NewLogModule("nsPrefetch");
nsresult rv;
// read prefs and hook up pref observer
mDisabled = !Preferences::GetBool(PREFETCH_PREF, !mDisabled);
Preferences::AddWeakObserver(this, PREFETCH_PREF);
// Observe xpcom-shutdown event
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (!observerService)
return NS_ERROR_FAILURE;
rv = observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, true);
NS_ENSURE_SUCCESS(rv, rv);
if (!mDisabled)
AddProgressListener();
return NS_OK;
}
void
nsPrefetchService::ProcessNextURI()
{
nsresult rv;
nsCOMPtr<nsIURI> uri, referrer;
mCurrentNode = nullptr;
do {
rv = DequeueNode(getter_AddRefs(mCurrentNode));
if (NS_FAILED(rv)) break;
if (LOG_ENABLED()) {
nsAutoCString spec;
mCurrentNode->mURI->GetSpec(spec);
LOG(("ProcessNextURI [%s]\n", spec.get()));
}
//
// if opening the channel fails, then just skip to the next uri
//
nsRefPtr<nsPrefetchNode> node = mCurrentNode;
rv = node->OpenChannel();
}
while (NS_FAILED(rv));
}
void
nsPrefetchService::NotifyLoadRequested(nsPrefetchNode *node)
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (!observerService)
return;
observerService->NotifyObservers(static_cast<nsIStreamListener*>(node),
"prefetch-load-requested", nullptr);
}
void
nsPrefetchService::NotifyLoadCompleted(nsPrefetchNode *node)
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (!observerService)
return;
observerService->NotifyObservers(static_cast<nsIStreamListener*>(node),
"prefetch-load-completed", nullptr);
}
//-----------------------------------------------------------------------------
// nsPrefetchService <private>
//-----------------------------------------------------------------------------
void
nsPrefetchService::AddProgressListener()
{
// Register as an observer for the document loader
nsCOMPtr<nsIWebProgress> progress =
do_GetService(NS_DOCUMENTLOADER_SERVICE_CONTRACTID);
if (progress)
progress->AddProgressListener(this, nsIWebProgress::NOTIFY_STATE_DOCUMENT);
}
void
nsPrefetchService::RemoveProgressListener()
{
// Register as an observer for the document loader
nsCOMPtr<nsIWebProgress> progress =
do_GetService(NS_DOCUMENTLOADER_SERVICE_CONTRACTID);
if (progress)
progress->RemoveProgressListener(this);
}
nsresult
nsPrefetchService::EnqueueNode(nsPrefetchNode *aNode)
{
NS_ADDREF(aNode);
if (!mQueueTail) {
mQueueHead = aNode;
mQueueTail = aNode;
}
else {
mQueueTail->mNext = aNode;
mQueueTail = aNode;
}
return NS_OK;
}
nsresult
nsPrefetchService::EnqueueURI(nsIURI *aURI,
nsIURI *aReferrerURI,
nsIDOMNode *aSource,
nsPrefetchNode **aNode)
{
nsPrefetchNode *node = new nsPrefetchNode(this, aURI, aReferrerURI,
aSource);
if (!node)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*aNode = node);
return EnqueueNode(node);
}
nsresult
nsPrefetchService::DequeueNode(nsPrefetchNode **node)
{
if (!mQueueHead)
return NS_ERROR_NOT_AVAILABLE;
// give the ref to the caller
*node = mQueueHead;
mQueueHead = mQueueHead->mNext;
(*node)->mNext = nullptr;
if (!mQueueHead)
mQueueTail = nullptr;
return NS_OK;
}
void
nsPrefetchService::EmptyQueue()
{
do {
nsRefPtr<nsPrefetchNode> node;
DequeueNode(getter_AddRefs(node));
} while (mQueueHead);
}
void
nsPrefetchService::StartPrefetching()
{
//
// at initialization time we might miss the first DOCUMENT START
// notification, so we have to be careful to avoid letting our
// stop count go negative.
//
if (mStopCount > 0)
mStopCount--;
LOG(("StartPrefetching [stopcount=%d]\n", mStopCount));
// only start prefetching after we've received enough DOCUMENT
// STOP notifications. we do this inorder to defer prefetching
// until after all sub-frames have finished loading.
if (mStopCount == 0 && !mCurrentNode) {
mHaveProcessed = true;
ProcessNextURI();
}
}
void
nsPrefetchService::StopPrefetching()
{
mStopCount++;
LOG(("StopPrefetching [stopcount=%d]\n", mStopCount));
// only kill the prefetch queue if we've actually started prefetching.
if (!mCurrentNode)
return;
mCurrentNode->CancelChannel(NS_BINDING_ABORTED);
mCurrentNode = nullptr;
EmptyQueue();
}
//-----------------------------------------------------------------------------
// nsPrefetchService::nsISupports
//-----------------------------------------------------------------------------
NS_IMPL_ISUPPORTS(nsPrefetchService,
nsIPrefetchService,
nsIWebProgressListener,
nsIObserver,
nsISupportsWeakReference)
//-----------------------------------------------------------------------------
// nsPrefetchService::nsIPrefetchService
//-----------------------------------------------------------------------------
nsresult
nsPrefetchService::Prefetch(nsIURI *aURI,
nsIURI *aReferrerURI,
nsIDOMNode *aSource,
bool aExplicit)
{
nsresult rv;
NS_ENSURE_ARG_POINTER(aURI);
NS_ENSURE_ARG_POINTER(aReferrerURI);
if (LOG_ENABLED()) {
nsAutoCString spec;
aURI->GetSpec(spec);
LOG(("PrefetchURI [%s]\n", spec.get()));
}
if (mDisabled) {
LOG(("rejected: prefetch service is disabled\n"));
return NS_ERROR_ABORT;
}
//
// XXX we should really be asking the protocol handler if it supports
// caching, so we can determine if there is any value to prefetching.
// for now, we'll only prefetch http links since we know that's the
// most common case. ignore https links since https content only goes
// into the memory cache.
//
// XXX we might want to either leverage nsIProtocolHandler::protocolFlags
// or possibly nsIRequest::loadFlags to determine if this URI should be
// prefetched.
//
bool match;
rv = aURI->SchemeIs("http", &match);
if (NS_FAILED(rv) || !match) {
rv = aURI->SchemeIs("https", &match);
if (NS_FAILED(rv) || !match) {
LOG(("rejected: URL is not of type http/https\n"));
return NS_ERROR_ABORT;
}
}
//
// the referrer URI must be http:
//
rv = aReferrerURI->SchemeIs("http", &match);
if (NS_FAILED(rv) || !match) {
rv = aReferrerURI->SchemeIs("https", &match);
if (NS_FAILED(rv) || !match) {
LOG(("rejected: referrer URL is neither http nor https\n"));
return NS_ERROR_ABORT;
}
}
// skip URLs that contain query strings, except URLs for which prefetching
// has been explicitly requested.
if (!aExplicit) {
nsCOMPtr<nsIURL> url(do_QueryInterface(aURI, &rv));
if (NS_FAILED(rv)) return rv;
nsAutoCString query;
rv = url->GetQuery(query);
if (NS_FAILED(rv) || !query.IsEmpty()) {
LOG(("rejected: URL has a query string\n"));
return NS_ERROR_ABORT;
}
}
//
// cancel if being prefetched
//
if (mCurrentNode) {
bool equals;
if (NS_SUCCEEDED(mCurrentNode->mURI->Equals(aURI, &equals)) && equals) {
LOG(("rejected: URL is already being prefetched\n"));
return NS_ERROR_ABORT;
}
}
//
// cancel if already on the prefetch queue
//
nsPrefetchNode *node = mQueueHead;
for (; node; node = node->mNext) {
bool equals;
if (NS_SUCCEEDED(node->mURI->Equals(aURI, &equals)) && equals) {
LOG(("rejected: URL is already on prefetch queue\n"));
return NS_ERROR_ABORT;
}
}
nsRefPtr<nsPrefetchNode> enqueuedNode;
rv = EnqueueURI(aURI, aReferrerURI, aSource,
getter_AddRefs(enqueuedNode));
NS_ENSURE_SUCCESS(rv, rv);
NotifyLoadRequested(enqueuedNode);
// if there are no pages loading, kick off the request immediately
if (mStopCount == 0 && mHaveProcessed)
ProcessNextURI();
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchService::PrefetchURI(nsIURI *aURI,
nsIURI *aReferrerURI,
nsIDOMNode *aSource,
bool aExplicit)
{
return Prefetch(aURI, aReferrerURI, aSource, aExplicit);
}
NS_IMETHODIMP
nsPrefetchService::EnumerateQueue(nsISimpleEnumerator **aEnumerator)
{
*aEnumerator = new nsPrefetchQueueEnumerator(this);
if (!*aEnumerator) return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*aEnumerator);
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsPrefetchService::nsIWebProgressListener
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsPrefetchService::OnProgressChange(nsIWebProgress *aProgress,
nsIRequest *aRequest,
int32_t curSelfProgress,
int32_t maxSelfProgress,
int32_t curTotalProgress,
int32_t maxTotalProgress)
{
NS_NOTREACHED("notification excluded in AddProgressListener(...)");
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchService::OnStateChange(nsIWebProgress* aWebProgress,
nsIRequest *aRequest,
uint32_t progressStateFlags,
nsresult aStatus)
{
if (progressStateFlags & STATE_IS_DOCUMENT) {
if (progressStateFlags & STATE_STOP)
StartPrefetching();
else if (progressStateFlags & STATE_START)
StopPrefetching();
}
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchService::OnLocationChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest,
nsIURI *location,
uint32_t aFlags)
{
NS_NOTREACHED("notification excluded in AddProgressListener(...)");
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchService::OnStatusChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest,
nsresult aStatus,
const char16_t* aMessage)
{
NS_NOTREACHED("notification excluded in AddProgressListener(...)");
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchService::OnSecurityChange(nsIWebProgress *aWebProgress,
nsIRequest *aRequest,
uint32_t state)
{
NS_NOTREACHED("notification excluded in AddProgressListener(...)");
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsPrefetchService::nsIObserver
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsPrefetchService::Observe(nsISupports *aSubject,
const char *aTopic,
const char16_t *aData)
{
LOG(("nsPrefetchService::Observe [topic=%s]\n", aTopic));
if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
StopPrefetching();
EmptyQueue();
mDisabled = true;
}
else if (!strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
if (Preferences::GetBool(PREFETCH_PREF, false)) {
if (mDisabled) {
LOG(("enabling prefetching\n"));
mDisabled = false;
AddProgressListener();
}
}
else {
if (!mDisabled) {
LOG(("disabling prefetching\n"));
StopPrefetching();
EmptyQueue();
mDisabled = true;
RemoveProgressListener();
}
}
}
return NS_OK;
}
// vim: ts=4 sw=4 expandtab
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