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First cut of IOC::truncate(). Got some of the unit test

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written.  Fixed some bugs.  Commented out the old truncate test
for now; depends on IOC::write() to extend a file.
This commit is contained in:
Patrick LeBlanc
2019-04-01 16:23:35 -05:00
parent d0aeffca07
commit b4ebf7c3c0
7 changed files with 232 additions and 51 deletions
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54
src/MetadataFile.cpp
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@@ -157,7 +157,6 @@ MetadataFile::MetadataFile(const char* filename, no_create_t)
MetadataFile::~MetadataFile()
{
}
int MetadataFile::stat(struct stat *out) const
@@ -165,12 +164,17 @@ int MetadataFile::stat(struct stat *out) const
int err = ::stat(mFilename.c_str(), out);
if (err)
return err;
out->st_size = getLength();
return 0;
}
size_t MetadataFile::getLength() const
{
size_t totalSize = 0;
for (auto &object : mObjects)
totalSize += object.length;
out->st_size = totalSize;
return 0;
return totalSize;
}
bool MetadataFile::exists() const
@@ -178,7 +182,7 @@ bool MetadataFile::exists() const
return _exists;
}
vector<metadataObject> MetadataFile::metadataRead(off_t offset, size_t length)
vector<metadataObject> MetadataFile::metadataRead(off_t offset, size_t length) const
{
// this version assumes mObjects is sorted by offset, and there are no gaps between objects
vector<metadataObject> ret;
@@ -187,8 +191,11 @@ vector<metadataObject> MetadataFile::metadataRead(off_t offset, size_t length)
auto i = mObjects.begin();
// find the first object in range
while (i != mObjects.end())
if (offset >= i->offset)
{
if (offset <= (i->offset + i->length - 1))
break;
++i;
}
// append objects until foundLen >= length or EOF
while (i != mObjects.end() && foundLen < length)
@@ -285,6 +292,35 @@ int MetadataFile::writeMetadata(const char *filename)
return error;
}
/*
void MetadataFile::truncate(size_t newLength)
{
// there's only one object to modify; the objects after it are deleted
auto &it = mObjects.begin();
while (it != mObjects.end())
{
size_t lastOffset = it->offset + it->length - 1;
if (lastOffset > newLength)
{
it->length = newLength - it->offset;
++it;
break;
}
++it;
}
while (it != mObjects.end())
{
auto toDelete = it++;
mObjects.erase(toDelete);
}
}
*/
void MetadataFile::removeEntry(off_t offset)
{
mObjects.erase(offset);
}
string MetadataFile::getNewKeyFromOldKey(const string &key, size_t length)
{
boost::uuids::uuid u = boost::uuids::random_generator()();
@@ -352,7 +388,7 @@ void MetadataFile::setLengthInKey(string &key, size_t newLength)
key = oss.str();
}
void MetadataFile::printObjects()
void MetadataFile::printObjects() const
{
printf("Version: %i Revision: %i\n",mVersion,mRevision);
for (std::set<metadataObject>::const_iterator i = mObjects.begin(); i != mObjects.end(); ++i)
@@ -392,6 +428,12 @@ void MetadataFile::updateEntryLength(off_t offset, size_t newLength)
updateObj->length = newLength;
}
metadataObject::metadataObject()
{}
metadataObject::metadataObject(uint64_t _offset) : offset(_offset)
{}
}