Bug 1029782 - Have OPEN_SECRETLY flag for opening cache entries, r=michal

netwerk/cache2/CacheEntry.cpp

@@ -76,7 +76,8 @@ CacheEntryHandle::~CacheEntryHandle()
 
 CacheEntry::Callback::Callback(CacheEntry* aEntry,
                                nsICacheEntryOpenCallback *aCallback,
-                               bool aReadOnly, bool aCheckOnAnyThread)
+                               bool aReadOnly, bool aCheckOnAnyThread,
+                               bool aSecret)
 : mEntry(aEntry)
 , mCallback(aCallback)
 , mTargetThread(do_GetCurrentThread())
@@ -84,6 +85,7 @@ CacheEntry::Callback::Callback(CacheEntry* aEntry,
 , mCheckOnAnyThread(aCheckOnAnyThread)
 , mRecheckAfterWrite(false)
 , mNotWanted(false)
+, mSecret(aSecret)
 {
   MOZ_COUNT_CTOR(CacheEntry::Callback);
 
@@ -101,6 +103,7 @@ CacheEntry::Callback::Callback(CacheEntry::Callback const &aThat)
 , mCheckOnAnyThread(aThat.mCheckOnAnyThread)
 , mRecheckAfterWrite(aThat.mRecheckAfterWrite)
 , mNotWanted(aThat.mNotWanted)
+, mSecret(aThat.mSecret)
 {
   MOZ_COUNT_CTOR(CacheEntry::Callback);
 
@@ -269,11 +272,12 @@ void CacheEntry::AsyncOpen(nsICacheEntryOpenCallback* aCallback, uint32_t aFlags
   bool truncate = aFlags & nsICacheStorage::OPEN_TRUNCATE;
   bool priority = aFlags & nsICacheStorage::OPEN_PRIORITY;
   bool multithread = aFlags & nsICacheStorage::CHECK_MULTITHREADED;
+  bool secret = aFlags & nsICacheStorage::OPEN_SECRETLY;
 
   MOZ_ASSERT(!readonly || !truncate, "Bad flags combination");
   MOZ_ASSERT(!(truncate && mState > LOADING), "Must not call truncate on already loaded entry");
 
-  Callback callback(this, aCallback, readonly, multithread);
+  Callback callback(this, aCallback, readonly, multithread, secret);
 
   if (!Open(callback, truncate, priority, bypassIfBusy)) {
     // We get here when the callback wants to bypass cache when it's busy.
@@ -759,7 +763,7 @@ void CacheEntry::InvokeAvailableCallback(Callback const & aCallback)
     return;
   }
 
-  if (NS_SUCCEEDED(mFileStatus)) {
+  if (NS_SUCCEEDED(mFileStatus) && !aCallback.mSecret) {
     // Let the last-fetched and fetch-count properties be updated.
     mFile->OnFetched();
   }
@@ -773,6 +777,8 @@ void CacheEntry::InvokeAvailableCallback(Callback const & aCallback)
 
   if (state == READY) {
     LOG(("  ready/has-meta, notifying OCEA with entry and NS_OK"));
+
+    if (!aCallback.mSecret)
     {
       mozilla::MutexAutoLock lock(mLock);
       BackgroundOp(Ops::FRECENCYUPDATE);
@@ -822,7 +828,10 @@ CacheEntryHandle* CacheEntry::NewWriteHandle()
 {
   mozilla::MutexAutoLock lock(mLock);
 
+  // Ignore the OPEN_SECRETLY flag on purpose here, which should actually be
+  // used only along with OPEN_READONLY, but there is no need to enforce that.
   BackgroundOp(Ops::FRECENCYUPDATE);
+
   return (mWriter = NewHandle());
 }
 

netwerk/cache2/CacheEntry.h

@@ -137,7 +137,7 @@ private:
   public:
     Callback(CacheEntry* aEntry,
              nsICacheEntryOpenCallback *aCallback,
-             bool aReadOnly, bool aCheckOnAnyThread);
+             bool aReadOnly, bool aCheckOnAnyThread, bool aSecret);
     Callback(Callback const &aThat);
     ~Callback();
 
@@ -155,6 +155,7 @@ private:
     bool mCheckOnAnyThread : 1;
     bool mRecheckAfterWrite : 1;
     bool mNotWanted : 1;
+    bool mSecret : 1;
 
     nsresult OnCheckThread(bool *aOnCheckThread) const;
     nsresult OnAvailThread(bool *aOnAvailThread) const;

netwerk/cache2/nsICacheStorage.idl

@@ -51,6 +51,11 @@ interface nsICacheStorage : nsISupports
    */
   const uint32_t CHECK_MULTITHREADED = 1 << 4;
 
+  /**
+   * Don't automatically update any 'last used' metadata of the entry.
+   */
+  const uint32_t OPEN_SECRETLY = 1 << 5;
+
   /**
    * Asynchronously opens a cache entry for the specified URI.
    * Result is fetched asynchronously via the callback.

netwerk/test/unit/test_cache2-28a-OPEN_SECRETLY.js

@@ -0,0 +1,34 @@
+function run_test()
+{
+  do_get_profile();
+  function NowSeconds() {
+    return parseInt((new Date()).getTime() / 1000);
+  }
+  function do_check_time(a, b) {
+    do_check_true(Math.abs(a - b) < 0.5);
+  }
+
+  asyncOpenCacheEntry("http://t/", "disk", Ci.nsICacheStorage.OPEN_NORMALLY, null,
+    new OpenCallback(NEW, "m", "d", function(entry) {
+
+      var now1 = NowSeconds();
+      do_check_eq(entry.fetchCount, 1);
+      do_check_time(entry.lastFetched, now1);
+      do_check_time(entry.lastModified, now1);
+
+      do_timeout(2000, () => {
+        asyncOpenCacheEntry("http://t/", "disk", Ci.nsICacheStorage.OPEN_SECRETLY, null,
+          new OpenCallback(NORMAL, "m", "d", function(entry) {
+            do_check_eq(entry.fetchCount, 1);
+            do_check_time(entry.lastFetched, now1);
+            do_check_time(entry.lastModified, now1);
+
+            finish_cache2_test();
+          })
+        );
+      })
+    })
+  );
+
+  do_test_pending();
+}

netwerk/test/unit/xpcshell.ini

@@ -60,6 +60,7 @@ support-files =
 skip-if = os == "android"
 [test_cache2-27-force-valid-for.js]
 [test_cache2-28-last-access-attrs.js]
+[test_cache2-28a-OPEN_SECRETLY.js]
 [test_304_responses.js]
 [test_cacheForOfflineUse_no-store.js]
 [test_307_redirect.js]