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Tool.cc
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/* Copyright (c) 2012 Stanford University
* Copyright (c) 2014-2015 Diego Ongaro
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR(S) DISCLAIM ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL AUTHORS BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <getopt.h>
#include <sys/file.h>
#include <unistd.h>
#include <functional>
#include <iostream>
#include <string>
#include "build/Server/SnapshotMetadata.pb.h"
#include "build/Server/SnapshotStateMachine.pb.h"
#include "Core/Config.h"
#include "Core/Debug.h"
#include "Core/ProtoBuf.h"
#include "Core/StringUtil.h"
#include "Core/ThreadId.h"
#include "Core/Util.h"
#include "Storage/Layout.h"
#include "Storage/Log.h"
#include "Storage/LogFactory.h"
#include "Storage/SnapshotFile.h"
#include "Tree/Tree.h"
namespace {
using namespace LogCabin;
/**
* Parses argv for the main function.
*/
class OptionParser {
public:
OptionParser(int& argc, char**& argv)
: argc(argc)
, argv(argv)
, configFilename("logcabin.conf")
{
while (true) {
static struct option longOptions[] = {
{"config", required_argument, NULL, 'c'},
{"help", no_argument, NULL, 'h'},
{0, 0, 0, 0}
};
int c = getopt_long(argc, argv, "c:hi:", longOptions, NULL);
// Detect the end of the options.
if (c == -1)
break;
switch (c) {
case 'h':
usage();
exit(0);
case 'c':
configFilename = optarg;
break;
case '?':
default:
// getopt_long already printed an error message.
usage();
exit(1);
}
}
// We don't expect any additional command line arguments (not options).
if (optind != argc) {
usage();
exit(1);
}
}
void usage() {
std::cout
<< "Dumps out the contents of LogCabin's storage directory "
<< "(the log and snapshot)."
<< std::endl
<< "This will refuse to run while LogCabin is running, since "
<< "it does the"
<< std::endl
<< "equivalent of a fsck for the log."
<< std::endl
<< std::endl
<< "This program is subject to change (it is not part of "
<< "LogCabin's stable API)."
<< std::endl
<< std::endl
<< "Usage: " << argv[0] << " [options]"
<< std::endl
<< std::endl
<< "Options:"
<< std::endl
<< " -h, --help "
<< "Print this usage information"
<< std::endl
<< " -c <file>, --config=<file> "
<< "Set the path to the configuration file"
<< std::endl
<< " "
<< "[default: logcabin.conf]"
<< std::endl;
}
int& argc;
char**& argv;
std::string configFilename;
};
void
dumpTree(const Tree::Tree& tree, const std::string& path = "/")
{
std::cout << path << std::endl;
std::vector<std::string> children;
tree.listDirectory(path, children);
for (auto it = children.begin();
it != children.end();
++it) {
if (Core::StringUtil::endsWith(*it, "/")) {
dumpTree(tree, path + *it);
} else {
std::string contents;
tree.read(path + *it, contents);
std::cout << path << *it << " : " << contents << std::endl;
}
}
}
void
readSnapshot(Storage::Layout& storageLayout)
{
std::unique_ptr<Storage::SnapshotFile::Reader> reader;
try {
reader.reset(new Storage::SnapshotFile::Reader(storageLayout));
} catch (const std::runtime_error& e) { // file not found
NOTICE("%s", e.what());
return;
}
{ // Check that this snapshot uses format version 1
uint8_t version = 0;
uint64_t bytesRead = reader->readRaw(&version, sizeof(version));
if (bytesRead < 1) {
PANIC("Found completely empty snapshot file (it doesn't even "
"have a version field)");
} else {
if (version != 1) {
PANIC("Snapshot format version read was %u, but this code "
"can only read version 1",
version);
}
}
}
{ // read header protobuf from stream
Server::SnapshotMetadata::Header header;
std::string error = reader->readMessage(header);
if (!error.empty()) {
PANIC("couldn't read snapshot header: %s",
error.c_str());
}
NOTICE("Snapshot header start");
std::cout << Core::ProtoBuf::dumpString(header) << std::endl;
NOTICE("Snapshot header end");
}
{ // Check that the state machine part of the snapshot uses format
// version 1
uint8_t version = 0;
uint64_t bytesRead = reader->readRaw(&version, sizeof(version));
if (bytesRead < 1) {
PANIC("Snapshot file too short (no state machine version "
"field)");
} else {
if (version != 1) {
PANIC("State machine format version in snapshot read was "
"%u, but this code can only read version 1",
version);
}
}
}
{ // Load snapshot header
Server::SnapshotStateMachine::Header header;
std::string error = reader->readMessage(header);
if (!error.empty()) {
PANIC("Couldn't read state machine header from snapshot: %s",
error.c_str());
}
NOTICE("Snapshot state machine header start");
std::cout << Core::ProtoBuf::dumpString(header) << std::endl;
NOTICE("Snapshot state machine header end");
}
{ // read Tree from stream
Tree::Tree tree;
tree.loadSnapshot(*reader);
NOTICE("Snapshot tree start");
dumpTree(tree);
NOTICE("Snapshot tree end");
}
}
} // anonymous namespace
int
main(int argc, char** argv)
{
using namespace LogCabin;
try {
Core::Util::Finally _(google::protobuf::ShutdownProtobufLibrary);
Core::ThreadId::setName("main");
// Parse command line args.
OptionParser options(argc, argv);
NOTICE("Using config file %s", options.configFilename.c_str());
Core::Config config;
config.readFile(options.configFilename.c_str());
Core::Debug::setLogPolicy(
Core::Debug::logPolicyFromString(
config.read<std::string>("logPolicy", "NOTICE")));
uint64_t serverId = config.read<uint64_t>("serverId");
NOTICE("Server ID is %lu", serverId);
Storage::Layout storageLayout;
storageLayout.init(config, serverId);
NOTICE("Opening log at %s", storageLayout.serverDir.path.c_str());
{
std::unique_ptr<Storage::Log> log =
Storage::LogFactory::makeLog(config, storageLayout);
NOTICE("Log contents start");
std::cout << *log << std::endl;
NOTICE("Log contents end");
}
NOTICE("Reading snapshot at %s", storageLayout.serverDir.path.c_str());
readSnapshot(storageLayout);
return 0;
} catch (const Core::Config::Exception& e) {
ERROR("Fatal exception from config file: %s",
e.what());
}
}