Mongocxx库分割错误

如何解决Mongocxx库分割错误

我正在尝试在Docker映像中安装mongo-c-driver和mongo-cxx-driver，但是当我运行C++程序时，它将引发Segmentation错误。有任何想法吗？瓦尔格朗德说这是蒙哥的错。

我有一些物联网设备，并且在我自己的计算机上，它们运行正常。

我正在使用：

• ubuntu:focal作为基本图片
• mongo-c-driver版本1.16.2（也尝试过1.17和1.15）
• mongo-cxx-driver版本3.5（也尝试过3.6）
• MongoDB服务器版本4.2.8
• g++版本(Ubuntu 9.3.0-10ubuntu2) 9.3.0

代码：

std::string MongoDB::insertDocument(std::string database,std::string collection,bsoncxx::document::view_or_value document)
{
    try
    {
        mongocxx::uri uri(_connection_string);
        mongocxx::client conn(uri); // seg fault occurs here

        mongocxx::database db = conn[database];
        mongocxx::collection coll = db[collection];

        auto inserted = coll.insert_one(document.view());

        bsoncxx::oid oid = inserted->inserted_id().get_oid().value;
        return oid.to_string();
    }
    catch (const mongocxx::exception & e)
    {
        std::cerr << "WARNING: Unable to connect to MongoDB" << std::endl;
        return "UNKNowN";
    }
}

变量值：

_connection_string = "mongodb://burns"
database = "hopping"
collection = "executions"
document = 
{
    "created_at" : "2020.09.29 10:48:51","hostname" : "XXXXX","interface" : "wlp3s0mon","schedule" : [ 1 ],"slot_size" : 200,"type" : "MOCK_NODE"
}

日志：

==213== Invalid read of size 8
==213==    at 0x5695C0A: mongoc_counter_clients_active_add (mongoc-counters.defs:37)
==213==    by 0x5695C0A: mongoc_counter_clients_active_inc (mongoc-counters.defs:37)
==213==    by 0x5695C0A: _mongoc_client_new_from_uri (mongoc-client.c:1101)
==213==    by 0x5318074: mongocxx::v_noabi::client::client(mongocxx::v_noabi::uri const&,mongocxx::v_noabi::options::client const&) (in /usr/local/lib/libmongocxx.so.3.5.0)
==213==    by 0x4B691D0: MongoDB::insertDocument(std::__cxx11::basic_string<char,std::char_traits<char>,std::allocator<char> >,std::__cxx11::basic_string<char,bsoncxx::v_noabi::view_or_value<bsoncxx::v_noabi::document::view,bsoncxx::v_noabi::document::value>) (in /usr/local/lib/influx_logging/libinflux_logging.so)
==213==    by 0x4B69714: MongoDB::insertJSONDocument(std::__cxx11::basic_string<char,nlohmann::basic_json<std::map,std::vector,bool,long,unsigned long,double,std::allocator,nlohmann::adl_serializer,std::vector<unsigned char,std::allocator<unsigned char> > >) (in /usr/local/lib/influx_logging/libinflux_logging.so)
==213==    by 0x4B61AD0: DataLogger::setExecutionParameters(nlohmann::basic_json<std::map,std::allocator<unsigned char> > >,std::allocator<char> >) (in /usr/local/lib/influx_logging/libinflux_logging.so)
==213==    by 0x1C232B: main (in /root/mock_node/build/mock_node)
==213==  Address 0x38 is not stack'd,malloc'd or (recently) free'd
==213== 
==213== 
==213== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==213==  Access not within mapped region at address 0x38
==213==    at 0x5695C0A: mongoc_counter_clients_active_add (mongoc-counters.defs:37)
==213==    by 0x5695C0A: mongoc_counter_clients_active_inc (mongoc-counters.defs:37)
==213==    by 0x5695C0A: _mongoc_client_new_from_uri (mongoc-client.c:1101)
==213==    by 0x5318074: mongocxx::v_noabi::client::client(mongocxx::v_noabi::uri const&,std::allocator<char> >) (in /usr/local/lib/influx_logging/libinflux_logging.so)
==213==    by 0x1C232B: main (in /root/mock_node/build/mock_node)
==213==  If you believe this happened as a result of a stack
==213==  overflow in your program's main thread (unlikely but
==213==  possible),you can try to increase the size of the
==213==  main thread stack using the --main-stacksize= flag.
==213==  The main thread stack size used in this run was 8388608.
==213== 
==213== HEAP SUMMARY:
==213==     in use at exit: 123,339 bytes in 262 blocks
==213==   total heap usage: 3,719 allocs,3,457 frees,367,254 bytes allocated
==213== 
==213== LEAK SUMMARY:
==213==    definitely lost: 400 bytes in 1 blocks
==213==    indirectly lost: 6,752 bytes in 20 blocks
==213==      possibly lost: 576 bytes in 2 blocks
==213==    still reachable: 115,611 bytes in 239 blocks
==213==         suppressed: 0 bytes in 0 blocks
==213== Rerun with --leak-check=full to see details of leaked memory
==213== 
==213== For lists of detected and suppressed errors,rerun with: -s
==213== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Segmentation fault (core dumped)

Ps：mock_node是我的可执行文件，influxdb-logging是我的库。

非常感谢你， 我不知道是什么原因造成的...

解决方法

来自Tutorial for mongocxx：

重要：在建立任何连接之前，您需要创建mongocxx::instance的一个实例和一个实例。此实例必须存在于整个程序中。

因此，您可以将其添加为static类的MongoDB成员：

标题

class MongoDB {
    //...
private:
     static mongocxx::instance inst;
};

偶像

mongocxx::instance MongoDB::inst{};

在此示例中，我连接到默认的mongodb服务器（mongodb://localhost:27017），使用数据库dbted和集合movie，这两个数据库都是先前使用{{1 }} CLI。

我添加了一种方法，可以向集合中的所有文档获取mongo。

mongocxx::cursor