added mongodb sink

[mguludag]

Hello I've added custom sink for writing logs to mongodb. If I will have free time I want to make dynamic mongodb document structure based on format string pattern.

Dependencies

• mongocxx

Usage samples

asynchronous logger

#include <spdlog/async.h>
#include <spdlog/sinks/mongo_sink.h>
#include <spdlog/spdlog.h>
#include <thread>

int main() {
  std::thread t1([&] {
    auto logging = spdlog::async_factory::create<spdlog::sinks::mongo_sink>(
        "mongo_logger_1", "db", "collection");
    for (auto i = 0; i < 10; ++i) {
      logging->info("thread_1 iter: {}",i);
      std::this_thread::sleep_for(std::chrono::milliseconds(500));
    }
  });

  std::thread t2([&] {
    auto logging = spdlog::async_factory::create<spdlog::sinks::mongo_sink>(
        "mongo_logger_2", "db", "collection");
    for (auto i = 0; i < 10; ++i) {
      logging->info("thread_2 iter: {}",i);
      std::this_thread::sleep_for(std::chrono::milliseconds(100));
    }
  });

  std::this_thread::sleep_for(std::chrono::seconds(10));

  t1.join();
  t2.join();

  return 0;
}

synchronous logger

#include <spdlog/sinks/mongo_sink.h>
#include <spdlog/spdlog.h>
#include <thread>

int main() {
    auto logging = spdlog::create<spdlog::sinks::mongo_sink>(
        "mongo_logger", "db", "collection");
  std::thread t1([&] {
    for (auto i = 0; i < 10; ++i) {
      logging->info("thread_1" + std::to_string(i));
      std::this_thread::sleep_for(std::chrono::milliseconds(500));
    }
  });

  std::thread t2([&] {
    for (auto i = 0; i < 10; ++i) {
      logging->info("thread_2" + std::to_string(i));
      std::this_thread::sleep_for(std::chrono::milliseconds(100));
    }
  });

  std::this_thread::sleep_for(std::chrono::seconds(10));

  t1.join();
  t2.join();

  return 0;
}

Example document from mongodb

{
  "_id": {
    "$oid": "60d87492314f000087006980"
  },
  "timestamp": {
    "$date": "2021-06-27T12:52:34.985Z"
  },
  "level": "info",
  "message": "thread_1 5",
  "logger_name": "mongo_logger1",
  "thread_id": 18892
}

[gabime]

Thanks. Not sure about the conflicting license though.. spdlog is MIT and yours is GPL3

[mguludag]

Thanks. Not sure about the conflicting license though.. spdlog is MIT and yours is GPL3

Ok, I forgot old license template in Qt creator. I'll change it to MIT license

[mguludag]

License changed to MIT

[gabime]

can you replace to (like all other spdlog files):

“// Distributed under the MIT License (http://opensource.org/licenses/MIT)”

[mguludag]

Ok, I changed the license comment

[gabime]

Thanks. It is better to inherit form base sink so that users can choose to create single or multithreaded sink.
Would be nice if you could fix it. see https://github.com/gabime/spdlog/wiki/4.-Sinks#implementing-your-own-sink for example.

Also printing to cerr id taken care of by the exception handker on the upper layer and should be removed here.

[mguludag]

Thanks. It is better to inherit form base sink so that users can choose to create single or multithreaded sink.
Would be nice if you could fix it. see https://github.com/gabime/spdlog/wiki/4.-Sinks#implementing-your-own-sink for example.

Also printing to cerr id taken care of by the exception handker on the upper layer and should be removed here.

Also, why the mongocxx::instance instance is static? seems it should be regular member.

I changed the base class to base_sink and added factory functions. mongocxx::instance instance must not be constructed more than once or the it will crash.

[gabime]

Thanks. Merged and added a small fix (2a09f66)