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/**
* Copyright (C) 2016 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
#include "mongo/platform/basic.h"
#include "mongo/transport/service_entry_point_utils.h"
#include "mongo/db/client.h"
#include "mongo/db/server_options.h"
#include "mongo/stdx/memory.h"
#include "mongo/transport/session.h"
#include "mongo/transport/transport_layer.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/debug_util.h"
#include "mongo/util/log.h"
#include "mongo/util/net/socket_exception.h"
#include "mongo/util/quick_exit.h"
#ifdef __linux__ // TODO: consider making this ifndef _WIN32
#include <sys/resource.h>
#endif
#if !defined(__has_feature)
#define __has_feature(x) 0
#endif
namespace mongo {
namespace {
struct Context {
Context(transport::Session session, stdx::function<void(transport::Session*)> task)
: session(std::move(session)), task(std::move(task)) {}
transport::Session session;
stdx::function<void(transport::Session*)> task;
};
void* runFunc(void* ptr) {
std::unique_ptr<Context> ctx(static_cast<Context*>(ptr));
auto tl = ctx->session.getTransportLayer();
Client::initThread("conn", &ctx->session);
setThreadName(std::string(str::stream() << "conn" << ctx->session.id()));
try {
ctx->task(&ctx->session);
} catch (const AssertionException& e) {
log() << "AssertionException handling request, closing client connection: " << e;
} catch (const SocketException& e) {
log() << "SocketException handling request, closing client connection: " << e;
} catch (const DBException& e) {
// must be right above std::exception to avoid catching subclasses
log() << "DBException handling request, closing client connection: " << e;
} catch (const std::exception& e) {
error() << "Uncaught std::exception: " << e.what() << ", terminating";
quickExit(EXIT_UNCAUGHT);
}
tl->end(ctx->session);
if (!serverGlobalParams.quiet) {
auto conns = tl->sessionStats().numOpenSessions;
const char* word = (conns == 1 ? " connection" : " connections");
log() << "end connection " << ctx->session.remote() << " (" << conns << word
<< " now open)";
}
Client::destroy();
return nullptr;
}
} // namespace
void launchWrappedServiceEntryWorkerThread(transport::Session&& session,
stdx::function<void(transport::Session*)> task) {
auto ctx = stdx::make_unique<Context>(std::move(session), std::move(task));
try {
#ifndef __linux__ // TODO: consider making this ifdef _WIN32
stdx::thread(stdx::bind(runFunc, ctx.get())).detach();
ctx.release();
#else
pthread_attr_t attrs;
pthread_attr_init(&attrs);
pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
static const size_t STACK_SIZE =
1024 * 1024; // if we change this we need to update the warning
struct rlimit limits;
invariant(getrlimit(RLIMIT_STACK, &limits) == 0);
if (limits.rlim_cur > STACK_SIZE) {
size_t stackSizeToSet = STACK_SIZE;
#if !__has_feature(address_sanitizer)
if (kDebugBuild)
stackSizeToSet /= 2;
#endif
int failed = pthread_attr_setstacksize(&attrs, stackSizeToSet);
if (failed) {
const auto ewd = errnoWithDescription(failed);
warning() << "pthread_attr_setstacksize failed: " << ewd;
}
} else if (limits.rlim_cur < 1024 * 1024) {
warning() << "Stack size set to " << (limits.rlim_cur / 1024) << "KB. We suggest 1MB";
}
pthread_t thread;
int failed = pthread_create(&thread, &attrs, runFunc, ctx.get());
pthread_attr_destroy(&attrs);
if (failed) {
log() << "pthread_create failed: " << errnoWithDescription(failed);
throw std::system_error(
std::make_error_code(std::errc::resource_unavailable_try_again));
}
ctx.release();
#endif // __linux__
} catch (...) {
log() << "failed to create service entry worker thread for " << ctx->session.remote();
}
}
} // namespace mongo
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