bool Store::Sink::push(Fountain::Combination &incoming)
{
std::unique_lock<std::mutex> lock(mMutex);
mSink.solve(incoming);
if(!mSink.isDecoded()) return false;
BinaryString sinkDigest;
mSink.hash(sinkDigest);
LogDebug("Store::push", "Block is complete, digest is " + sinkDigest.toString());
if(!mDigest.empty() && sinkDigest != mDigest)
{
LogWarn("Store::push", "Block digest is invalid (expected " + mDigest.toString() + ")");
mSink.clear();
return false;
}
mPath = Cache::Instance->path(mDigest);
File file(mPath, File::Write);
mSize = mSink.dump(file);
file.close();
return true;
}
void Resource::fetch(const BinaryString &digest, bool localOnly)
{
delete mIndexBlock;
delete mIndexRecord;
mIndexRecord = NULL;
mIndexBlock = NULL;
if(localOnly && !Store::Instance->hasBlock(digest))
throw Exception(String("Local resource not found: ") + digest.toString());
//LogDebug("Resource::fetch", "Fetching resource " + digest.toString());
try {
mIndexBlock = new Block(digest);
mIndexRecord = new IndexRecord;
//LogDebug("Resource::fetch", "Reading index block for " + digest.toString());
BinarySerializer serializer(mIndexBlock);
AssertIO(static_cast<Serializer*>(&serializer)->input(mIndexRecord));
}
catch(const std::exception &e)
{
delete mIndexBlock;
delete mIndexRecord;
mIndexRecord = NULL;
mIndexBlock = NULL;
throw Exception(String("Unable to fetch resource index block: ") + e.what());
}
}
bool Store::waitBlock(const BinaryString &digest, duration timeout)
{
if(!hasBlock(digest))
{
Network::Caller caller(digest); // Block is missing locally, call it
LogDebug("Store::waitBlock", "Waiting for block: " + digest.toString());
{
std::unique_lock<std::mutex> lock(mMutex);
if(!mCondition.wait_for(lock, timeout, [this, digest]() {
return hasBlock(digest);
}))
return false;
}
LogDebug("Store::waitBlock", "Block is now available: " + digest.toString());
}
return true;
}
bool Cache::prefetch(const BinaryString &target)
{
// Test local availability
if(Store::Instance->hasBlock(target))
{
Resource resource(target, true); // local only
if(resource.isLocallyAvailable())
return true;
}
mScheduler.schedule(Scheduler::clock::now(), [target]() {
try {
Resource resource(target);
Resource::Reader reader(&resource);
reader.discard(); // read everything
}
catch(const Exception &e)
{
LogWarn("Cache::prefetch", "Prefetching failed for " + target.toString());
}
});
return false;
}
String Cache::path(const BinaryString &digest) const
{
Assert(!digest.empty());
return mDirectory + Directory::Separator + digest.toString();
}
