X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Fkv%2FMemDB.cc;fp=src%2Fceph%2Fsrc%2Fkv%2FMemDB.cc;h=d6af78b182706e1a5ad191d9750b2373c0817f09;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/kv/MemDB.cc b/src/ceph/src/kv/MemDB.cc
new file mode 100644
index 0000000..d6af78b
--- /dev/null
+++ b/src/ceph/src/kv/MemDB.cc
@@ -0,0 +1,595 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * In-memory crash non-safe keyvalue db
+ * Author: Ramesh Chander, Ramesh.Chander@sandisk.com
+ */
+
+#include "include/compat.h"
+#include <set>
+#include <map>
+#include <string>
+#include <memory>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include "common/perf_counters.h"
+#include "common/debug.h"
+#include "include/str_list.h"
+#include "include/str_map.h"
+#include "KeyValueDB.h"
+#include "MemDB.h"
+
+#include "include/assert.h"
+#include "common/debug.h"
+#include "common/errno.h"
+#include "include/compat.h"
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_memdb
+#undef dout_prefix
+#define dout_prefix *_dout << "memdb: "
+#define dtrace dout(30)
+#define dwarn dout(0)
+#define dinfo dout(0)
+
+static void split_key(const string& raw_key, string *prefix, string *key)
+{
+  size_t pos = raw_key.find(KEY_DELIM, 0);
+  assert(pos != std::string::npos);
+  *prefix = raw_key.substr(0, pos);
+  *key = raw_key.substr(pos + 1, raw_key.length());
+}
+
+static string make_key(const string &prefix, const string &value)
+{
+  string out = prefix;
+  out.push_back(KEY_DELIM);
+  out.append(value);
+  return out;
+}
+
+void MemDB::_encode(mdb_iter_t iter, bufferlist &bl)
+{
+  ::encode(iter->first, bl);
+  ::encode(iter->second, bl);
+}
+
+std::string MemDB::_get_data_fn()
+{
+  string fn = m_db_path + "/" + "MemDB.db";
+  return fn;
+}
+
+void MemDB::_save()
+{
+  std::lock_guard<std::mutex> l(m_lock);
+  dout(10) << __func__ << " Saving MemDB to file: "<< _get_data_fn().c_str() << dendl;
+  int mode = 0644;
+  int fd = TEMP_FAILURE_RETRY(::open(_get_data_fn().c_str(),
+                                     O_WRONLY|O_CREAT|O_TRUNC, mode));
+  if (fd < 0) {
+    int err = errno;
+    cerr << "write_file(" << _get_data_fn().c_str() << "): failed to open file: "
+         << cpp_strerror(err) << std::endl;
+    return;
+  }
+  bufferlist bl;
+  mdb_iter_t iter = m_map.begin();
+  while (iter != m_map.end()) {
+    dout(10) << __func__ << " Key:"<< iter->first << dendl;
+    _encode(iter, bl);
+    ++iter;
+  }
+  bl.write_fd(fd);
+
+  VOID_TEMP_FAILURE_RETRY(::close(fd));
+}
+
+int MemDB::_load()
+{
+  std::lock_guard<std::mutex> l(m_lock);
+  dout(10) << __func__ << " Reading MemDB from file: "<< _get_data_fn().c_str() << dendl;
+  /*
+   * Open file and read it in single shot.
+   */
+  int fd = TEMP_FAILURE_RETRY(::open(_get_data_fn().c_str(), O_RDONLY));
+  if (fd < 0) {
+    int err = errno;
+    cerr << "can't open " << _get_data_fn().c_str() << ": "
+         << cpp_strerror(err) << std::endl;
+    return -err;
+  }
+
+  struct stat st;
+  memset(&st, 0, sizeof(st));
+  if (::fstat(fd, &st) < 0) {
+    int err = errno;
+    cerr << "can't stat file " << _get_data_fn().c_str() << ": "
+         << cpp_strerror(err) << std::endl;
+    VOID_TEMP_FAILURE_RETRY(::close(fd));
+    return -err;
+  }
+
+  ssize_t file_size = st.st_size;
+  ssize_t bytes_done = 0;
+  while (bytes_done < file_size) {
+    string key;
+    bufferptr datap;
+
+    bytes_done += ::decode_file(fd, key);
+    bytes_done += ::decode_file(fd, datap);
+
+    dout(10) << __func__ << " Key:"<< key << dendl;
+    m_map[key] = datap;
+    m_total_bytes += datap.length();
+  }
+  VOID_TEMP_FAILURE_RETRY(::close(fd));
+  return 0;
+}
+
+int MemDB::_init(bool create)
+{
+  int r;
+  dout(1) << __func__ << dendl;
+  if (create) {
+    r = ::mkdir(m_db_path.c_str(), 0700);
+    if (r < 0) {
+      r = -errno;
+      if (r != -EEXIST) {
+        derr << __func__ << " mkdir failed: " << cpp_strerror(r) << dendl;
+        return r;
+      }
+      return 0; // ignore EEXIST
+    }
+  } else {
+    r = _load();
+  }
+
+  return r;
+}
+
+int MemDB::set_merge_operator(
+  const string& prefix,
+  std::shared_ptr<KeyValueDB::MergeOperator> mop)
+{
+  merge_ops.push_back(std::make_pair(prefix, mop));
+  return 0;
+}
+
+int MemDB::do_open(ostream &out, bool create)
+{
+  m_total_bytes = 0;
+  m_allocated_bytes = 1;
+
+  return _init(create);
+}
+
+MemDB::~MemDB()
+{
+  close();
+  dout(10) << __func__ << " Destroying MemDB instance: "<< dendl;
+}
+
+void MemDB::close()
+{
+  /*
+   * Save whatever in memory btree.
+   */
+  _save();
+}
+
+int MemDB::submit_transaction(KeyValueDB::Transaction t)
+{
+  MDBTransactionImpl* mt =  static_cast<MDBTransactionImpl*>(t.get());
+
+  dtrace << __func__ << " " << mt->get_ops().size() << dendl;
+  for(auto& op : mt->get_ops()) {
+    if(op.first == MDBTransactionImpl::WRITE) {
+      ms_op_t set_op = op.second;
+      _setkey(set_op);
+    } else if (op.first == MDBTransactionImpl::MERGE) {
+      ms_op_t merge_op = op.second;
+      _merge(merge_op);
+    } else {
+      ms_op_t rm_op = op.second;
+      assert(op.first == MDBTransactionImpl::DELETE);
+      _rmkey(rm_op);
+    }
+  }
+
+  return 0;
+}
+
+int MemDB::submit_transaction_sync(KeyValueDB::Transaction tsync)
+{
+  dtrace << __func__ << " " << dendl;
+  submit_transaction(tsync);
+  return 0;
+}
+
+int MemDB::transaction_rollback(KeyValueDB::Transaction t)
+{
+  MDBTransactionImpl* mt =  static_cast<MDBTransactionImpl*>(t.get());
+  mt->clear();
+  return 0;
+}
+
+void MemDB::MDBTransactionImpl::set(
+  const string &prefix, const string &k, const bufferlist &to_set_bl)
+{
+  dtrace << __func__ << " " << prefix << " " << k << dendl;
+  ops.push_back(make_pair(WRITE, std::make_pair(std::make_pair(prefix, k),
+                  to_set_bl)));
+}
+
+void MemDB::MDBTransactionImpl::rmkey(const string &prefix,
+    const string &k)
+{
+  dtrace << __func__ << " " << prefix << " " << k << dendl;
+  ops.push_back(make_pair(DELETE,
+                          std::make_pair(std::make_pair(prefix, k),
+                          bufferlist())));
+}
+
+void MemDB::MDBTransactionImpl::rmkeys_by_prefix(const string &prefix)
+{
+  KeyValueDB::Iterator it = m_db->get_iterator(prefix);
+  for (it->seek_to_first(); it->valid(); it->next()) {
+    rmkey(prefix, it->key());
+  }
+}
+
+void MemDB::MDBTransactionImpl::rm_range_keys(const string &prefix, const string &start, const string &end)
+{
+  KeyValueDB::Iterator it = m_db->get_iterator(prefix);
+  it->lower_bound(start);
+  while (it->valid()) {
+    if (it->key() >= end) {
+      break;
+    }
+    rmkey(prefix, it->key());
+    it->next();
+  }
+}
+
+void MemDB::MDBTransactionImpl::merge(
+  const std::string &prefix, const std::string &key, const bufferlist  &value)
+{
+
+  dtrace << __func__ << " " << prefix << " " << key << dendl;
+  ops.push_back(make_pair(MERGE, make_pair(std::make_pair(prefix, key), value)));
+  return;
+}
+
+int MemDB::_setkey(ms_op_t &op)
+{
+  std::lock_guard<std::mutex> l(m_lock);
+  std::string key = make_key(op.first.first, op.first.second);
+  bufferlist bl = op.second;
+
+  m_total_bytes += bl.length();
+
+  bufferlist bl_old;
+  if (_get(op.first.first, op.first.second, &bl_old)) {
+    /*
+     * delete and free existing key.
+     */
+    assert(m_total_bytes >= bl_old.length());
+    m_total_bytes -= bl_old.length();
+    m_map.erase(key);
+  }
+
+  m_map[key] = bufferptr((char *) bl.c_str(), bl.length());
+  iterator_seq_no++;
+  return 0;
+}
+
+int MemDB::_rmkey(ms_op_t &op)
+{
+  std::lock_guard<std::mutex> l(m_lock);
+  std::string key = make_key(op.first.first, op.first.second);
+
+  bufferlist bl_old;
+  if (_get(op.first.first, op.first.second, &bl_old)) {
+    assert(m_total_bytes >= bl_old.length());
+    m_total_bytes -= bl_old.length();
+  }
+  iterator_seq_no++;
+  /*
+   * Erase will call the destructor for bufferptr.
+   */
+  return m_map.erase(key);
+}
+
+std::shared_ptr<KeyValueDB::MergeOperator> MemDB::_find_merge_op(std::string prefix)
+{
+  for (const auto& i : merge_ops) {
+    if (i.first == prefix) {
+      return i.second;
+    }
+  }
+
+  dtrace << __func__ << " No merge op for " << prefix << dendl;
+  return NULL;
+}
+
+
+int MemDB::_merge(ms_op_t &op)
+{
+  std::lock_guard<std::mutex> l(m_lock);
+  std::string prefix = op.first.first;
+  std::string key = make_key(op.first.first, op.first.second);
+  bufferlist bl = op.second;
+  int64_t bytes_adjusted = bl.length();
+
+  /*
+   *  find the operator for this prefix
+   */
+  std::shared_ptr<MergeOperator> mop = _find_merge_op(prefix);
+  assert(mop);
+
+  /*
+   * call the merge operator with value and non value
+   */
+  bufferlist bl_old;
+  if (_get(op.first.first, op.first.second, &bl_old) == false) {
+    std::string new_val;
+    /*
+     * Merge non existent.
+     */
+    mop->merge_nonexistent(bl.c_str(), bl.length(), &new_val);
+    m_map[key] = bufferptr(new_val.c_str(), new_val.length());
+  } else {
+    /*
+     * Merge existing.
+     */
+    std::string new_val;
+    mop->merge(bl_old.c_str(), bl_old.length(), bl.c_str(), bl.length(), &new_val);
+    m_map[key] = bufferptr(new_val.c_str(), new_val.length());
+    bytes_adjusted -= bl_old.length();
+    bl_old.clear();
+  }
+
+  assert((int64_t)m_total_bytes + bytes_adjusted >= 0);
+  m_total_bytes += bytes_adjusted;
+  iterator_seq_no++;
+  return 0;
+}
+
+/*
+ * Caller take btree lock.
+ */
+bool MemDB::_get(const string &prefix, const string &k, bufferlist *out)
+{
+  string key = make_key(prefix, k);
+
+  mdb_iter_t iter = m_map.find(key);
+  if (iter == m_map.end()) {
+    return false;
+  }
+
+  out->push_back((m_map[key].clone()));
+  return true;
+}
+
+bool MemDB::_get_locked(const string &prefix, const string &k, bufferlist *out)
+{
+  std::lock_guard<std::mutex> l(m_lock);
+  return _get(prefix, k, out);
+}
+
+
+int MemDB::get(const string &prefix, const std::string& key,
+                 bufferlist *out)
+{
+  if (_get_locked(prefix, key, out)) {
+    return 0;
+  }
+  return -ENOENT;
+}
+
+int MemDB::get(const string &prefix, const std::set<string> &keys,
+    std::map<string, bufferlist> *out)
+{
+  for (const auto& i : keys) {
+    bufferlist bl;
+    if (_get_locked(prefix, i, &bl))
+      out->insert(make_pair(i, bl));
+  }
+
+  return 0;
+}
+
+void MemDB::MDBWholeSpaceIteratorImpl::fill_current()
+{
+  bufferlist bl;
+  bl.append(m_iter->second.clone());
+  m_key_value = std::make_pair(m_iter->first, bl);
+}
+
+bool MemDB::MDBWholeSpaceIteratorImpl::valid()
+{
+  if (m_key_value.first.empty()) {
+    return false;
+  }
+  return true;
+}
+
+bool MemDB::MDBWholeSpaceIteratorImpl::iterator_validate() {
+
+  if (this_seq_no != *global_seq_no) {
+    auto key = m_key_value.first;
+    assert(!key.empty());
+
+    bool restart_iter = false;
+    if (!m_using_btree) {
+      /*
+       * Map is modified and marker key does not exists, 
+       * restart the iterator from next key.
+       */
+      if (m_map_p->find(key) == m_map_p->end()) {
+        restart_iter = true;
+      }
+    } else {
+      restart_iter = true;
+    }
+
+    if (restart_iter) {
+      m_iter = m_map_p->lower_bound(key);
+      if (m_iter == m_map_p->end()) {
+        return false;
+      }
+    }
+
+    /*
+     * This iter is valid now.
+     */
+    this_seq_no = *global_seq_no;
+  }
+
+  return true;
+}
+
+void
+MemDB::MDBWholeSpaceIteratorImpl::free_last()
+{
+  m_key_value.first.clear();
+  m_key_value.second.clear();
+}
+
+string MemDB::MDBWholeSpaceIteratorImpl::key()
+{
+  dtrace << __func__ << " " << m_key_value.first << dendl;
+  string prefix, key;
+  split_key(m_key_value.first, &prefix, &key);
+  return key;
+}
+
+pair<string,string> MemDB::MDBWholeSpaceIteratorImpl::raw_key()
+{
+  string prefix, key;
+  split_key(m_key_value.first, &prefix, &key);
+  return make_pair(prefix, key);
+}
+
+bool MemDB::MDBWholeSpaceIteratorImpl::raw_key_is_prefixed(
+    const string &prefix)
+{
+  string p, k;
+  split_key(m_key_value.first, &p, &k);
+  return (p == prefix);
+}
+
+bufferlist MemDB::MDBWholeSpaceIteratorImpl::value()
+{
+  dtrace << __func__ << " " << m_key_value << dendl;
+  return m_key_value.second;
+}
+
+int MemDB::MDBWholeSpaceIteratorImpl::next()
+{
+  std::lock_guard<std::mutex> l(*m_map_lock_p);
+  if (!iterator_validate()) {
+    free_last();
+    return -1;
+  }
+  free_last();
+  ++m_iter;
+  if (m_iter != m_map_p->end()) {
+    fill_current();
+    return 0;
+  } else {
+    return -1;
+  }
+}
+
+int MemDB::MDBWholeSpaceIteratorImpl:: prev()
+{
+  std::lock_guard<std::mutex> l(*m_map_lock_p);
+  if (!iterator_validate()) {
+    free_last();
+    return -1;
+  }
+  free_last();
+  if (m_iter != m_map_p->begin()) {
+    --m_iter;
+    fill_current();
+    return 0;
+  } else {
+    return -1;
+  }
+}
+
+/*
+ * First key >= to given key, if key is null then first key in btree.
+ */
+int MemDB::MDBWholeSpaceIteratorImpl::seek_to_first(const std::string &k)
+{
+  std::lock_guard<std::mutex> l(*m_map_lock_p);
+  free_last();
+  if (k.empty()) {
+    m_iter = m_map_p->begin();
+  } else {
+    m_iter = m_map_p->lower_bound(k);
+  }
+  
+  if (m_iter == m_map_p->end()) {
+    return -1;
+  }
+  fill_current();
+  return 0;
+}
+
+int MemDB::MDBWholeSpaceIteratorImpl::seek_to_last(const std::string &k)
+{
+  std::lock_guard<std::mutex> l(*m_map_lock_p);
+  free_last();
+  if (k.empty()) {
+    m_iter = m_map_p->end();
+    --m_iter;
+  } else {
+    m_iter = m_map_p->lower_bound(k);
+  }
+
+  if (m_iter == m_map_p->end()) {
+    return -1;
+  }
+  fill_current();
+  return 0;
+}
+
+MemDB::MDBWholeSpaceIteratorImpl::~MDBWholeSpaceIteratorImpl()
+{
+  free_last();
+}
+
+int MemDB::MDBWholeSpaceIteratorImpl::upper_bound(const std::string &prefix,
+    const std::string &after) {
+
+  std::lock_guard<std::mutex> l(*m_map_lock_p);
+
+  dtrace << "upper_bound " << prefix.c_str() << after.c_str() << dendl;
+  string k = make_key(prefix, after);
+  m_iter = m_map_p->upper_bound(k);
+  if (m_iter != m_map_p->end()) {
+    fill_current();
+    return 0;
+  }
+  return -1;
+}
+
+int MemDB::MDBWholeSpaceIteratorImpl::lower_bound(const std::string &prefix,
+    const std::string &to) {
+  std::lock_guard<std::mutex> l(*m_map_lock_p);
+  dtrace << "lower_bound " << prefix.c_str() << to.c_str() << dendl;
+  string k = make_key(prefix, to);
+  m_iter = m_map_p->lower_bound(k);
+  if (m_iter != m_map_p->end()) {
+    fill_current();
+    return 0;
+  }
+  return -1;
+}