X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Fkv%2FLevelDBStore.cc;fp=src%2Fceph%2Fsrc%2Fkv%2FLevelDBStore.cc;h=25ff7a698d2e32bc56d6682d347373d687c5f731;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/kv/LevelDBStore.cc b/src/ceph/src/kv/LevelDBStore.cc
new file mode 100644
index 0000000..25ff7a6
--- /dev/null
+++ b/src/ceph/src/kv/LevelDBStore.cc
@@ -0,0 +1,403 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+#include "LevelDBStore.h"
+
+#include <set>
+#include <map>
+#include <string>
+#include <cerrno>
+
+using std::string;
+
+#include "include/memory.h"
+
+#include "common/debug.h"
+#include "common/perf_counters.h"
+
+// re-include our assert to clobber the system one; fix dout:
+#include "include/assert.h"
+
+#define dout_context cct
+#define dout_subsys ceph_subsys_leveldb
+#undef dout_prefix
+#define dout_prefix *_dout << "leveldb: "
+
+class CephLevelDBLogger : public leveldb::Logger {
+  CephContext *cct;
+public:
+  explicit CephLevelDBLogger(CephContext *c) : cct(c) {
+    cct->get();
+  }
+  ~CephLevelDBLogger() override {
+    cct->put();
+  }
+
+  // Write an entry to the log file with the specified format.
+  void Logv(const char* format, va_list ap) override {
+    dout(1);
+    char buf[65536];
+    vsnprintf(buf, sizeof(buf), format, ap);
+    *_dout << buf << dendl;
+  }
+};
+
+leveldb::Logger *create_leveldb_ceph_logger()
+{
+  return new CephLevelDBLogger(g_ceph_context);
+}
+
+int LevelDBStore::init(string option_str)
+{
+  // init defaults.  caller can override these if they want
+  // prior to calling open.
+  options.write_buffer_size = g_conf->leveldb_write_buffer_size;
+  options.cache_size = g_conf->leveldb_cache_size;
+  options.block_size = g_conf->leveldb_block_size;
+  options.bloom_size = g_conf->leveldb_bloom_size;
+  options.compression_enabled = g_conf->leveldb_compression;
+  options.paranoid_checks = g_conf->leveldb_paranoid;
+  options.max_open_files = g_conf->leveldb_max_open_files;
+  options.log_file = g_conf->leveldb_log;
+  return 0;
+}
+
+int LevelDBStore::do_open(ostream &out, bool create_if_missing)
+{
+  leveldb::Options ldoptions;
+
+  if (options.write_buffer_size)
+    ldoptions.write_buffer_size = options.write_buffer_size;
+  if (options.max_open_files)
+    ldoptions.max_open_files = options.max_open_files;
+  if (options.cache_size) {
+    leveldb::Cache *_db_cache = leveldb::NewLRUCache(options.cache_size);
+    db_cache.reset(_db_cache);
+    ldoptions.block_cache = db_cache.get();
+  }
+  if (options.block_size)
+    ldoptions.block_size = options.block_size;
+  if (options.bloom_size) {
+#ifdef HAVE_LEVELDB_FILTER_POLICY
+    const leveldb::FilterPolicy *_filterpolicy =
+	leveldb::NewBloomFilterPolicy(options.bloom_size);
+    filterpolicy.reset(_filterpolicy);
+    ldoptions.filter_policy = filterpolicy.get();
+#else
+    assert(0 == "bloom size set but installed leveldb doesn't support bloom filters");
+#endif
+  }
+  if (options.compression_enabled)
+    ldoptions.compression = leveldb::kSnappyCompression;
+  else
+    ldoptions.compression = leveldb::kNoCompression;
+  if (options.block_restart_interval)
+    ldoptions.block_restart_interval = options.block_restart_interval;
+
+  ldoptions.error_if_exists = options.error_if_exists;
+  ldoptions.paranoid_checks = options.paranoid_checks;
+  ldoptions.create_if_missing = create_if_missing;
+
+  if (g_conf->leveldb_log_to_ceph_log) {
+    ceph_logger = new CephLevelDBLogger(g_ceph_context);
+    ldoptions.info_log = ceph_logger;
+  }
+  
+  if (options.log_file.length()) {
+    leveldb::Env *env = leveldb::Env::Default();
+    env->NewLogger(options.log_file, &ldoptions.info_log);
+  }
+
+  leveldb::DB *_db;
+  leveldb::Status status = leveldb::DB::Open(ldoptions, path, &_db);
+  db.reset(_db);
+  if (!status.ok()) {
+    out << status.ToString() << std::endl;
+    return -EINVAL;
+  }
+
+  PerfCountersBuilder plb(g_ceph_context, "leveldb", l_leveldb_first, l_leveldb_last);
+  plb.add_u64_counter(l_leveldb_gets, "leveldb_get", "Gets");
+  plb.add_u64_counter(l_leveldb_txns, "leveldb_transaction", "Transactions");
+  plb.add_time_avg(l_leveldb_get_latency, "leveldb_get_latency", "Get Latency");
+  plb.add_time_avg(l_leveldb_submit_latency, "leveldb_submit_latency", "Submit Latency");
+  plb.add_time_avg(l_leveldb_submit_sync_latency, "leveldb_submit_sync_latency", "Submit Sync Latency");
+  plb.add_u64_counter(l_leveldb_compact, "leveldb_compact", "Compactions");
+  plb.add_u64_counter(l_leveldb_compact_range, "leveldb_compact_range", "Compactions by range");
+  plb.add_u64_counter(l_leveldb_compact_queue_merge, "leveldb_compact_queue_merge", "Mergings of ranges in compaction queue");
+  plb.add_u64(l_leveldb_compact_queue_len, "leveldb_compact_queue_len", "Length of compaction queue");
+  logger = plb.create_perf_counters();
+  cct->get_perfcounters_collection()->add(logger);
+
+  if (g_conf->leveldb_compact_on_mount) {
+    derr << "Compacting leveldb store..." << dendl;
+    compact();
+    derr << "Finished compacting leveldb store" << dendl;
+  }
+  return 0;
+}
+
+int LevelDBStore::_test_init(const string& dir)
+{
+  leveldb::Options options;
+  options.create_if_missing = true;
+  leveldb::DB *db;
+  leveldb::Status status = leveldb::DB::Open(options, dir, &db);
+  delete db;
+  return status.ok() ? 0 : -EIO;
+}
+
+LevelDBStore::~LevelDBStore()
+{
+  close();
+  delete logger;
+
+  // Ensure db is destroyed before dependent db_cache and filterpolicy
+  db.reset();
+  delete ceph_logger;
+}
+
+void LevelDBStore::close()
+{
+  // stop compaction thread
+  compact_queue_lock.Lock();
+  if (compact_thread.is_started()) {
+    compact_queue_stop = true;
+    compact_queue_cond.Signal();
+    compact_queue_lock.Unlock();
+    compact_thread.join();
+  } else {
+    compact_queue_lock.Unlock();
+  }
+
+  if (logger)
+    cct->get_perfcounters_collection()->remove(logger);
+}
+
+int LevelDBStore::submit_transaction(KeyValueDB::Transaction t)
+{
+  utime_t start = ceph_clock_now();
+  LevelDBTransactionImpl * _t =
+    static_cast<LevelDBTransactionImpl *>(t.get());
+  leveldb::Status s = db->Write(leveldb::WriteOptions(), &(_t->bat));
+  utime_t lat = ceph_clock_now() - start;
+  logger->inc(l_leveldb_txns);
+  logger->tinc(l_leveldb_submit_latency, lat);
+  return s.ok() ? 0 : -1;
+}
+
+int LevelDBStore::submit_transaction_sync(KeyValueDB::Transaction t)
+{
+  utime_t start = ceph_clock_now();
+  LevelDBTransactionImpl * _t =
+    static_cast<LevelDBTransactionImpl *>(t.get());
+  leveldb::WriteOptions options;
+  options.sync = true;
+  leveldb::Status s = db->Write(options, &(_t->bat));
+  utime_t lat = ceph_clock_now() - start;
+  logger->inc(l_leveldb_txns);
+  logger->tinc(l_leveldb_submit_sync_latency, lat);
+  return s.ok() ? 0 : -1;
+}
+
+void LevelDBStore::LevelDBTransactionImpl::set(
+  const string &prefix,
+  const string &k,
+  const bufferlist &to_set_bl)
+{
+  string key = combine_strings(prefix, k);
+  size_t bllen = to_set_bl.length();
+  // bufferlist::c_str() is non-constant, so we can't call c_str()
+  if (to_set_bl.is_contiguous() && bllen > 0) {
+    // bufferlist contains just one ptr or they're contiguous
+    bat.Put(leveldb::Slice(key), leveldb::Slice(to_set_bl.buffers().front().c_str(), bllen));
+  } else if ((bllen <= 32 * 1024) && (bllen > 0)) {
+    // 2+ bufferptrs that are not contiguopus
+    // allocate buffer on stack and copy bl contents to that buffer
+    // make sure the buffer isn't too large or we might crash here...    
+    char* slicebuf = (char*) alloca(bllen);
+    leveldb::Slice newslice(slicebuf, bllen);
+    std::list<buffer::ptr>::const_iterator pb;
+    for (pb = to_set_bl.buffers().begin(); pb != to_set_bl.buffers().end(); ++pb) {
+      size_t ptrlen = (*pb).length();
+      memcpy((void*)slicebuf, (*pb).c_str(), ptrlen);
+      slicebuf += ptrlen;
+    } 
+    bat.Put(leveldb::Slice(key), newslice);
+  } else {
+    // 2+ bufferptrs that are not contiguous, and enormous in size
+    bufferlist val = to_set_bl;
+    bat.Put(leveldb::Slice(key), leveldb::Slice(val.c_str(), val.length()));
+  }
+}
+
+void LevelDBStore::LevelDBTransactionImpl::rmkey(const string &prefix,
+					         const string &k)
+{
+  string key = combine_strings(prefix, k);
+  bat.Delete(leveldb::Slice(key));
+}
+
+void LevelDBStore::LevelDBTransactionImpl::rmkeys_by_prefix(const string &prefix)
+{
+  KeyValueDB::Iterator it = db->get_iterator(prefix);
+  for (it->seek_to_first();
+       it->valid();
+       it->next()) {
+    bat.Delete(leveldb::Slice(combine_strings(prefix, it->key())));
+  }
+}
+
+void LevelDBStore::LevelDBTransactionImpl::rm_range_keys(const string &prefix, const string &start, const string &end)
+{
+  KeyValueDB::Iterator it = db->get_iterator(prefix);
+  it->lower_bound(start);
+  while (it->valid()) {
+    if (it->key() >= end) {
+      break;
+    }
+    bat.Delete(combine_strings(prefix, it->key()));
+    it->next();
+  }
+}
+
+int LevelDBStore::get(
+    const string &prefix,
+    const std::set<string> &keys,
+    std::map<string, bufferlist> *out)
+{
+  utime_t start = ceph_clock_now();
+  for (std::set<string>::const_iterator i = keys.begin();
+       i != keys.end(); ++i) {
+    std::string value;
+    std::string bound = combine_strings(prefix, *i);
+    auto status = db->Get(leveldb::ReadOptions(), leveldb::Slice(bound), &value);
+    if (status.ok())
+      (*out)[*i].append(value);
+  }
+  utime_t lat = ceph_clock_now() - start;
+  logger->inc(l_leveldb_gets);
+  logger->tinc(l_leveldb_get_latency, lat);
+  return 0;
+}
+
+int LevelDBStore::get(const string &prefix, 
+      const string &key,
+      bufferlist *out)
+{
+  assert(out && (out->length() == 0));
+  utime_t start = ceph_clock_now();
+  int r = 0;
+  string value, k;
+  leveldb::Status s;
+  k = combine_strings(prefix, key);
+  s = db->Get(leveldb::ReadOptions(), leveldb::Slice(k), &value);
+  if (s.ok()) {
+    out->append(value);
+  } else {
+    r = -ENOENT;
+  }
+  utime_t lat = ceph_clock_now() - start;
+  logger->inc(l_leveldb_gets);
+  logger->tinc(l_leveldb_get_latency, lat);
+  return r;
+}
+
+string LevelDBStore::combine_strings(const string &prefix, const string &value)
+{
+  string out = prefix;
+  out.push_back(0);
+  out.append(value);
+  return out;
+}
+
+bufferlist LevelDBStore::to_bufferlist(leveldb::Slice in)
+{
+  bufferlist bl;
+  bl.append(bufferptr(in.data(), in.size()));
+  return bl;
+}
+
+int LevelDBStore::split_key(leveldb::Slice in, string *prefix, string *key)
+{
+  size_t prefix_len = 0;
+  
+  // Find separator inside Slice
+  char* separator = (char*) memchr(in.data(), 0, in.size());
+  if (separator == NULL)
+     return -EINVAL;
+  prefix_len = size_t(separator - in.data());
+  if (prefix_len >= in.size())
+    return -EINVAL;
+
+  if (prefix)
+    *prefix = string(in.data(), prefix_len);
+  if (key)
+    *key = string(separator+1, in.size() - prefix_len - 1);
+   return 0;
+}
+
+void LevelDBStore::compact()
+{
+  logger->inc(l_leveldb_compact);
+  db->CompactRange(NULL, NULL);
+}
+
+
+void LevelDBStore::compact_thread_entry()
+{
+  compact_queue_lock.Lock();
+  while (!compact_queue_stop) {
+    while (!compact_queue.empty()) {
+      pair<string,string> range = compact_queue.front();
+      compact_queue.pop_front();
+      logger->set(l_leveldb_compact_queue_len, compact_queue.size());
+      compact_queue_lock.Unlock();
+      logger->inc(l_leveldb_compact_range);
+      compact_range(range.first, range.second);
+      compact_queue_lock.Lock();
+      continue;
+    }
+    compact_queue_cond.Wait(compact_queue_lock);
+  }
+  compact_queue_lock.Unlock();
+}
+
+void LevelDBStore::compact_range_async(const string& start, const string& end)
+{
+  Mutex::Locker l(compact_queue_lock);
+
+  // try to merge adjacent ranges.  this is O(n), but the queue should
+  // be short.  note that we do not cover all overlap cases and merge
+  // opportunities here, but we capture the ones we currently need.
+  list< pair<string,string> >::iterator p = compact_queue.begin();
+  while (p != compact_queue.end()) {
+    if (p->first == start && p->second == end) {
+      // dup; no-op
+      return;
+    }
+    if (p->first <= end && p->first > start) {
+      // merge with existing range to the right
+      compact_queue.push_back(make_pair(start, p->second));
+      compact_queue.erase(p);
+      logger->inc(l_leveldb_compact_queue_merge);
+      break;
+    }
+    if (p->second >= start && p->second < end) {
+      // merge with existing range to the left
+      compact_queue.push_back(make_pair(p->first, end));
+      compact_queue.erase(p);
+      logger->inc(l_leveldb_compact_queue_merge);
+      break;
+    }
+    ++p;
+  }
+  if (p == compact_queue.end()) {
+    // no merge, new entry.
+    compact_queue.push_back(make_pair(start, end));
+    logger->set(l_leveldb_compact_queue_len, compact_queue.size());
+  }
+  compact_queue_cond.Signal();
+  if (!compact_thread.is_started()) {
+    compact_thread.create("levdbst_compact");
+  }
+}