ceph/src/mds/LogEvent.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15 #include "common/config.h"
  16 #include "LogEvent.h"
  17
  18 #include "MDSRank.h"
  19
  20 // events i know of
  21 #include "events/ESubtreeMap.h"
  22 #include "events/EExport.h"
  23 #include "events/EImportStart.h"
  24 #include "events/EImportFinish.h"
  25 #include "events/EFragment.h"
  26
  27 #include "events/EResetJournal.h"
  28 #include "events/ESession.h"
  29 #include "events/ESessions.h"
  30
  31 #include "events/EUpdate.h"
  32 #include "events/ESlaveUpdate.h"
  33 #include "events/EOpen.h"
  34 #include "events/ECommitted.h"
  35
  36 #include "events/ETableClient.h"
  37 #include "events/ETableServer.h"
  38
  39 #include "events/ENoOp.h"
  40
  41 #define dout_context g_ceph_context
  42
  43
  44 LogEvent *LogEvent::decode(bufferlist& bl)
  45 {
  46   // parse type, length
  47   bufferlist::iterator p = bl.begin();
  48   EventType type;
  49   LogEvent *event = NULL;
  50   ::decode(type, p);
  51
  52   if (EVENT_NEW_ENCODING == type) {
  53     try {
  54       DECODE_START(1, p);
  55       ::decode(type, p);
  56       event = decode_event(bl, p, type);
  57       DECODE_FINISH(p);
  58     }
  59     catch (const buffer::error &e) {
  60       generic_dout(0) << "failed to decode LogEvent (type maybe " << type << ")" << dendl;
  61       return NULL;
  62     }
  63   } else { // we are using classic encoding
  64     event = decode_event(bl, p, type);
  65   }
  66   return event;
  67 }
  68
  69
  70 std::string LogEvent::get_type_str() const
  71 {
  72   switch(_type) {
  73   case EVENT_SUBTREEMAP: return "SUBTREEMAP";
  74   case EVENT_SUBTREEMAP_TEST: return "SUBTREEMAP_TEST";
  75   case EVENT_EXPORT: return "EXPORT";
  76   case EVENT_IMPORTSTART: return "IMPORTSTART";
  77   case EVENT_IMPORTFINISH: return "IMPORTFINISH";
  78   case EVENT_FRAGMENT: return "FRAGMENT";
  79   case EVENT_RESETJOURNAL: return "RESETJOURNAL";
  80   case EVENT_SESSION: return "SESSION";
  81   case EVENT_SESSIONS_OLD: return "SESSIONS_OLD";
  82   case EVENT_SESSIONS: return "SESSIONS";
  83   case EVENT_UPDATE: return "UPDATE";
  84   case EVENT_SLAVEUPDATE: return "SLAVEUPDATE";
  85   case EVENT_OPEN: return "OPEN";
  86   case EVENT_COMMITTED: return "COMMITTED";
  87   case EVENT_TABLECLIENT: return "TABLECLIENT";
  88   case EVENT_TABLESERVER: return "TABLESERVER";
  89   case EVENT_NOOP: return "NOOP";
  90
  91   default:
  92     generic_dout(0) << "get_type_str: unknown type " << _type << dendl;
  93     return "UNKNOWN";
  94   }
  95 }
  96
  97
  98 /*
  99  * Resolve type string to type enum
 100  *
 101  * Return -1 if not found
 102  */
 103 LogEvent::EventType LogEvent::str_to_type(std::string const &str)
 104 {
 105   std::map<std::string, EventType> types;
 106   types["SUBTREEMAP"] = EVENT_SUBTREEMAP;
 107   types["SUBTREEMAP_TEST"] = EVENT_SUBTREEMAP_TEST;
 108   types["EXPORT"] = EVENT_EXPORT;
 109   types["IMPORTSTART"] = EVENT_IMPORTSTART;
 110   types["IMPORTFINISH"] = EVENT_IMPORTFINISH;
 111   types["FRAGMENT"] = EVENT_FRAGMENT;
 112   types["RESETJOURNAL"] = EVENT_RESETJOURNAL;
 113   types["SESSION"] = EVENT_SESSION;
 114   types["SESSIONS_OLD"] = EVENT_SESSIONS_OLD;
 115   types["SESSIONS"] = EVENT_SESSIONS;
 116   types["UPDATE"] = EVENT_UPDATE;
 117   types["SLAVEUPDATE"] = EVENT_SLAVEUPDATE;
 118   types["OPEN"] = EVENT_OPEN;
 119   types["COMMITTED"] = EVENT_COMMITTED;
 120   types["TABLECLIENT"] = EVENT_TABLECLIENT;
 121   types["TABLESERVER"] = EVENT_TABLESERVER;
 122   types["NOOP"] = EVENT_NOOP;
 123
 124   return types[str];
 125 }
 126
 127
 128 LogEvent *LogEvent::decode_event(bufferlist& bl, bufferlist::iterator& p, LogEvent::EventType type)
 129 {
 130   int length = bl.length() - p.get_off();
 131   generic_dout(15) << "decode_log_event type " << type << ", size " << length << dendl;
 132
 133   // create event
 134   LogEvent *le;
 135   switch (type) {
 136   case EVENT_SUBTREEMAP: le = new ESubtreeMap; break;
 137   case EVENT_SUBTREEMAP_TEST:
 138     le = new ESubtreeMap;
 139     le->set_type(type);
 140     break;
 141   case EVENT_EXPORT: le = new EExport; break;
 142   case EVENT_IMPORTSTART: le = new EImportStart; break;
 143   case EVENT_IMPORTFINISH: le = new EImportFinish; break;
 144   case EVENT_FRAGMENT: le = new EFragment; break;
 145
 146   case EVENT_RESETJOURNAL: le = new EResetJournal; break;
 147
 148   case EVENT_SESSION: le = new ESession; break;
 149   case EVENT_SESSIONS_OLD: le = new ESessions; (static_cast<ESessions *>(le))->mark_old_encoding(); break;
 150   case EVENT_SESSIONS: le = new ESessions; break;
 151
 152   case EVENT_UPDATE: le = new EUpdate; break;
 153   case EVENT_SLAVEUPDATE: le = new ESlaveUpdate; break;
 154   case EVENT_OPEN: le = new EOpen; break;
 155   case EVENT_COMMITTED: le = new ECommitted; break;
 156
 157   case EVENT_TABLECLIENT: le = new ETableClient; break;
 158   case EVENT_TABLESERVER: le = new ETableServer; break;
 159
 160   case EVENT_NOOP: le = new ENoOp; break;
 161
 162   default:
 163     generic_dout(0) << "uh oh, unknown log event type " << type << " length " << length << dendl;
 164     return NULL;
 165   }
 166
 167   // decode
 168   try {
 169     le->decode(p);
 170   }
 171   catch (const buffer::error &e) {
 172     generic_dout(0) << "failed to decode LogEvent type " << type << dendl;
 173     delete le;
 174     return NULL;
 175   }
 176
 177   assert(p.end());
 178   return le;
 179 }
 180