ClickHouse/utils/zookeeper-dump-tree/main.cpp

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#include <iostream>
#include <boost/program_options.hpp>
#include <Common/Exception.h>
#include <Poco/Event.h>
#include <zkutil/ZooKeeper.h>
/** Выводит в произвольном порядке пути всех узлов ZK. Возможно, только в указанной директории.
*/
struct CallbackState
{
std::string path;
std::list<CallbackState>::const_iterator it;
std::list<std::list<CallbackState>::const_iterator> children;
Int64 dataLength = 0;
};
using CallbackStates = std::list<CallbackState>;
CallbackStates states;
zkutil::ZooKeeper * zookeeper;
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int running_count = 0;
Poco::Event completed;
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void process(CallbackState & state);
void callback(
int rc,
const String_vector * strings,
const Stat * stat,
const void * data)
{
CallbackState * state = reinterpret_cast<CallbackState *>(const_cast<void *>(data));
if (rc != ZOK && rc != ZNONODE)
{
std::cerr << zerror(rc) << ", path: " << state->path << "\n";
}
if (stat != nullptr)
state->dataLength = stat->dataLength;
if (rc == ZOK && strings)
{
for (int32_t i = 0; i < strings->count; ++i)
{
states.emplace_back();
states.back().path = state->path + (state->path == "/" ? "" : "/") + strings->data[i];
states.back().it = --states.end();
state->children.push_back(states.back().it);
process(states.back());
}
}
--running_count;
if (running_count == 0)
completed.set();
}
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void process(CallbackState & state)
{
++running_count;
zoo_awget_children2(zookeeper->getHandle(), state.path.data(), nullptr, nullptr, callback, &state);
}
typedef std::pair<Int64, Int64> NodesBytes;
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NodesBytes printTree(const CallbackState & state)
{
Int64 nodes = 1;
Int64 bytes = state.dataLength;
for (auto child : state.children)
{
NodesBytes nodesBytes = printTree(*child);
nodes += nodesBytes.first;
bytes += nodesBytes.second;
}
std::cout << state.path << '\t' << nodes << '\t' << bytes <<'\n';
return NodesBytes(nodes, bytes);
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}
int main(int argc, char ** argv)
try
{
boost::program_options::options_description desc("Allowed options");
desc.add_options()
("help,h", "produce help message")
("address,a", boost::program_options::value<std::string>()->required(),
"addresses of ZooKeeper instances, comma separated. Example: example01e.yandex.ru:2181")
("path,p", boost::program_options::value<std::string>()->default_value("/"),
"where to start")
;
boost::program_options::variables_map options;
boost::program_options::store(boost::program_options::parse_command_line(argc, argv, desc), options);
if (options.count("help"))
{
std::cout << "Dump paths of all nodes in ZooKeeper." << std::endl;
std::cout << "Usage: " << argv[0] << " [options]" << std::endl;
std::cout << desc << std::endl;
return 1;
}
zkutil::ZooKeeper zookeeper_(options.at("address").as<std::string>());
zookeeper = &zookeeper_;
states.emplace_back();
states.back().path = options.at("path").as<std::string>();
states.back().it = --states.end();
process(states.back());
completed.wait();
printTree(*states.begin());
}
catch (...)
{
std::cerr << DB::getCurrentExceptionMessage(true) << '\n';
throw;
}