12595591960

Committed 03 Jan 2025 09:27AM UTC coverage: 62.774% (+2.5%) from 60.245%

Build # 12595591960

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Pull #15008

github

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web-flow

Commit Message

Merge c2a2749d3 into 788f396a7

Pull Request Pull Request #15008: Do not follow CNAME records for ANY or CNAME queries

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39.13

/pdns/distributor.hh

/*
 * This file is part of PowerDNS or dnsdist.
 * Copyright -- PowerDNS.COM B.V. and its contributors
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * In addition, for the avoidance of any doubt, permission is granted to
 * link this program with OpenSSL and to (re)distribute the binaries
 * produced as the result of such linking.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
#pragma once
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string>
#include <deque>
#include <queue>
#include <vector>
#include <thread>
#include "threadname.hh"
#include <unistd.h>

#include "channel.hh"
#include "logger.hh"
#include "dns.hh"
#include "dnsbackend.hh"
#include "pdnsexception.hh"
#include "arguments.hh"
#include <atomic>
#include "statbag.hh"
#include "gss_context.hh"

extern StatBag S;

/** the Distributor template class enables you to multithread slow question/answer 
    processes. 
    
    Questions are posed to the Distributor, which returns the answer via a callback.

    The Distributor spawns sufficient backends, and if they thrown an exception,
    it will cycle the backend but drop the query that was active during the exception.
*/

template<class Answer, class Question, class Backend> class Distributor
{
public:
  static Distributor* Create(int n=1); //!< Create a new Distributor with \param n threads
  typedef std::function<void(std::unique_ptr<Answer>&, int)> callback_t;
  virtual int question(Question&, callback_t callback) =0; //!< Submit a question to the Distributor
  virtual int getQueueSize() =0; //!< Returns length of question queue
  virtual bool isOverloaded() =0;
  virtual ~Distributor() { cerr<<__func__<<endl;}
};

template<class Answer, class Question, class Backend> class SingleThreadDistributor
    : public Distributor<Answer, Question, Backend>
{
public:
  SingleThreadDistributor(const SingleThreadDistributor&) = delete;
  void operator=(const SingleThreadDistributor&) = delete;
  SingleThreadDistributor();
  typedef std::function<void(std::unique_ptr<Answer>&, int)> callback_t;
  int question(Question&, callback_t callback) override; //!< Submit a question to the Distributor
  int getQueueSize() override {
    return 0;
  }

  bool isOverloaded() override
  {
    return false;
  }

private:
  std::unique_ptr<Backend> b{nullptr};
};

template<class Answer, class Question, class Backend> class MultiThreadDistributor
    : public Distributor<Answer, Question, Backend>
{
public:
  MultiThreadDistributor(const MultiThreadDistributor&) = delete;
  void operator=(const MultiThreadDistributor&) = delete;
  MultiThreadDistributor(int n);
  typedef std::function<void(std::unique_ptr<Answer>&, int)> callback_t;
  int question(Question&, callback_t callback) override; //!< Submit a question to the Distributor
  void distribute(int n);
  int getQueueSize() override {
    return d_queued;
  }

  struct QuestionData
  {
    QuestionData(const Question& query): Q(query)
    {
      start = Q.d_dt.udiff();
    }

    Question Q;
    callback_t callback{nullptr};
    int id{0};
    int start{0};
  };

  bool isOverloaded() override
  {
    return d_overloadQueueLength && (d_queued > d_overloadQueueLength);
  }

private:
  std::vector<pdns::channel::Sender<QuestionData>> d_senders;
  std::vector<pdns::channel::Receiver<QuestionData>> d_receivers;
  time_t d_last_started{0};
  std::atomic<unsigned int> d_queued{0};
  unsigned int d_overloadQueueLength{0};
  unsigned int d_maxQueueLength{0};
  int d_nextid{0};
  int d_num_threads{0};
};

template<class Answer, class Question, class Backend> Distributor<Answer,Question,Backend>* Distributor<Answer,Question,Backend>::Create(int n)
{
    if( n == 1 )
      return new SingleThreadDistributor<Answer,Question,Backend>();
    else
      return new MultiThreadDistributor<Answer,Question,Backend>( n );
}

template<class Answer, class Question, class Backend>SingleThreadDistributor<Answer,Question,Backend>::SingleThreadDistributor()
{
  g_log<<Logger::Error<<"Only asked for 1 backend thread - operating unthreaded"<<endl;
  try {
    b=make_unique<Backend>();
  }
  catch(const PDNSException &AE) {
    g_log<<Logger::Error<<"Distributor caught fatal exception: "<<AE.reason<<endl;
    _exit(1);
  }
  catch(const std::exception& e) {
    g_log<<Logger::Error<<"Distributor caught fatal exception: "<<e.what()<<endl;
    _exit(1);
  }
  catch(...) {
    g_log<<Logger::Error<<"Caught an unknown exception when creating backend, probably"<<endl;
    _exit(1);
  }
}

template<class Answer, class Question, class Backend>MultiThreadDistributor<Answer,Question,Backend>::MultiThreadDistributor(int numberOfThreads) :
  d_last_started(time(nullptr)), d_overloadQueueLength(::arg().asNum("overload-queue-length")), d_maxQueueLength(::arg().asNum("max-queue-length")), d_num_threads(numberOfThreads)
{
  if (numberOfThreads < 1) {
    g_log<<Logger::Error<<"Asked for fewer than 1 threads, nothing to do"<<endl;
    _exit(1);
  }

  for (int distributorIdx = 0; distributorIdx < numberOfThreads; distributorIdx++) {
    auto [sender, receiver] = pdns::channel::createObjectQueue<QuestionData>(pdns::channel::SenderBlockingMode::SenderBlocking, pdns::channel::ReceiverBlockingMode::ReceiverBlocking);
    d_senders.push_back(std::move(sender));
    d_receivers.push_back(std::move(receiver));
  }

  g_log<<Logger::Warning<<"About to create "<<numberOfThreads<<" backend threads for UDP"<<endl;

  for (int distributorIdx = 0; distributorIdx < numberOfThreads; distributorIdx++) {
    std::thread t([=](){distribute(distributorIdx);});
    t.detach();
    Utility::usleep(50000); // we've overloaded mysql in the past :-)
  }
  g_log<<Logger::Warning<<"Done launching threads, ready to distribute questions"<<endl;
}


// start of a new thread
template<class Answer, class Question, class Backend>void MultiThreadDistributor<Answer,Question,Backend>::distribute(int ournum)
{
  // this is the longest name we can use, not a typo
  setThreadName("pdns/distributo");

  try {
    auto b = make_unique<Backend>(); // this will answer our questions
    int queuetimeout = ::arg().asNum("queue-limit");
    auto& receiver = d_receivers.at(ournum);

    for (;;) {
      auto tempQD = receiver.receive();
      if (!tempQD) {
        unixDie("read");
      }
      --d_queued;
      auto questionData = std::move(*tempQD);
      std::unique_ptr<Answer> a = nullptr;
      if (queuetimeout && questionData->Q.d_dt.udiff() > queuetimeout * 1000) {
        S.inc("timedout-packets");
        continue;
      }

      bool allowRetry = true;
retry:
      // this is the only point where we interact with the backend (synchronous)
      try {
        if (!b) {
          allowRetry = false;
          b = make_unique<Backend>();
        }
        a = b->question(questionData->Q);
      }
      catch (const PDNSException &e) {
        b.reset();
        if (!allowRetry) {
          g_log<<Logger::Error<<"Backend error: "<<e.reason<<endl;
          a = questionData->Q.replyPacket();

          a->setRcode(RCode::ServFail);
          S.inc("servfail-packets");
          S.ringAccount("servfail-queries", questionData->Q.qdomain, questionData->Q.qtype);
        } else {
          g_log<<Logger::Notice<<"Backend error (retry once): "<<e.reason<<endl;
          goto retry;
        }
      }
      catch (...) {
        b.reset();
        if (!allowRetry) {
          g_log<<Logger::Error<<"Caught unknown exception in Distributor thread "<<std::this_thread::get_id()<<endl;
          a = questionData->Q.replyPacket();

          a->setRcode(RCode::ServFail);
          S.inc("servfail-packets");
          S.ringAccount("servfail-queries", questionData->Q.qdomain, questionData->Q.qtype);
        } else {
          g_log<<Logger::Warning<<"Caught unknown exception in Distributor thread "<<std::this_thread::get_id()<<" (retry once)"<<endl;
          goto retry;
        }
      }

      questionData->callback(a, questionData->start);
#ifdef ENABLE_GSS_TSIG
      if (g_doGssTSIG && a != nullptr) {
        questionData->Q.cleanupGSS(a->d.rcode);
      }
#endif
      questionData.reset();
    }

    b.reset();
  }
  catch (const PDNSException &AE) {
    g_log<<Logger::Error<<"Distributor caught fatal exception: "<<AE.reason<<endl;
    _exit(1);
  }
  catch (const std::exception& e) {
    g_log<<Logger::Error<<"Distributor caught fatal exception: "<<e.what()<<endl;
    _exit(1);
  }
  catch (...) {
    g_log<<Logger::Error<<"Caught an unknown exception when creating backend, probably"<<endl;
    _exit(1);
  }
}

template<class Answer, class Question, class Backend>int SingleThreadDistributor<Answer,Question,Backend>::question(Question& q, callback_t callback)
{
  int start = q.d_dt.udiff();
  std::unique_ptr<Answer> a = nullptr;
  bool allowRetry=true;
retry:
  try {
    if (!b) {
      allowRetry=false;
      b=make_unique<Backend>();
    }
    a=b->question(q); // a can be NULL!
  }
  catch(const PDNSException &e) {
    b.reset();
    if (!allowRetry) {
      g_log<<Logger::Error<<"Backend error: "<<e.reason<<endl;
      a=q.replyPacket();

      a->setRcode(RCode::ServFail);
      S.inc("servfail-packets");
      S.ringAccount("servfail-queries", q.qdomain, q.qtype);
    } else {
      g_log<<Logger::Notice<<"Backend error (retry once): "<<e.reason<<endl;
      goto retry;
    }
  }
  catch(...) {
    b.reset();
    if (!allowRetry) {
      g_log<<Logger::Error<<"Caught unknown exception in Distributor thread "<<std::this_thread::get_id()<<endl;
      a=q.replyPacket();

      a->setRcode(RCode::ServFail);
      S.inc("servfail-packets");
      S.ringAccount("servfail-queries", q.qdomain, q.qtype);
    } else {
      g_log<<Logger::Warning<<"Caught unknown exception in Distributor thread "<<std::this_thread::get_id()<<" (retry once)"<<endl;
      goto retry;
    }
  }
  callback(a, start);
#ifdef ENABLE_GSS_TSIG
  if (g_doGssTSIG && a != nullptr) {
    q.cleanupGSS(a->d.rcode);
  }
#endif
  return 0;
}

struct DistributorFatal{};

template<class Answer, class Question, class Backend>int MultiThreadDistributor<Answer,Question,Backend>::question(Question& q, callback_t callback)
{
  // this is passed to other process over pipe and released there
  auto questionData = std::make_unique<QuestionData>(q);
  auto ret = questionData->id = d_nextid++; // might be deleted after write!
  questionData->callback = callback;

  ++d_queued;
  if (!d_senders.at(questionData->id % d_senders.size()).send(std::move(questionData))) {
    --d_queued;
    questionData.reset();
    unixDie("write");
  }

  if (d_queued > d_maxQueueLength) {
    g_log<<Logger::Error<< d_queued <<" questions waiting for database/backend attention. Limit is "<<::arg().asNum("max-queue-length")<<", respawning"<<endl;
    // this will leak the entire contents of all pipes, nothing will be freed. Respawn when this happens!
    throw DistributorFatal();
  }

  return ret;
}

1	/*
2	* This file is part of PowerDNS or dnsdist.
3	* Copyright -- PowerDNS.COM B.V. and its contributors
4	*
5	* This program is free software; you can redistribute it and/or modify
6	* it under the terms of version 2 of the GNU General Public License as
7	* published by the Free Software Foundation.
8	*
9	* In addition, for the avoidance of any doubt, permission is granted to
10	* link this program with OpenSSL and to (re)distribute the binaries
11	* produced as the result of such linking.
12	*
13	* This program is distributed in the hope that it will be useful,
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16	* GNU General Public License for more details.
17	*
18	* You should have received a copy of the GNU General Public License
19	* along with this program; if not, write to the Free Software
20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21	*/
22	#pragma once
23	#ifdef HAVE_CONFIG_H
24	#include "config.h"
25	#endif
26	#include <string>
27	#include <deque>
28	#include <queue>
29	#include <vector>
30	#include <thread>
31	#include "threadname.hh"
32	#include <unistd.h>
33
34	#include "channel.hh"
35	#include "logger.hh"
36	#include "dns.hh"
37	#include "dnsbackend.hh"
38	#include "pdnsexception.hh"
39	#include "arguments.hh"
40	#include <atomic>
41	#include "statbag.hh"
42	#include "gss_context.hh"
43
44	extern StatBag S;
45
46	/** the Distributor template class enables you to multithread slow question/answer
47	processes.
48
49	Questions are posed to the Distributor, which returns the answer via a callback.
50
51	The Distributor spawns sufficient backends, and if they thrown an exception,
52	it will cycle the backend but drop the query that was active during the exception.
53	*/
54
55	template<class Answer, class Question, class Backend> class Distributor
56	{
57	public:
58	static Distributor* Create(int n=1); //!< Create a new Distributor with \param n threads
59	typedef std::function<void(std::unique_ptr<Answer>&, int)> callback_t;
60	virtual int question(Question&, callback_t callback) =0; //!< Submit a question to the Distributor
61	virtual int getQueueSize() =0; //!< Returns length of question queue
62	virtual bool isOverloaded() =0;
63	virtual ~Distributor() { cerr<<__func__<<endl;}	×
64	};
65
66	template<class Answer, class Question, class Backend> class SingleThreadDistributor
67	: public Distributor<Answer, Question, Backend>
68	{
69	public:
70	SingleThreadDistributor(const SingleThreadDistributor&) = delete;
71	void operator=(const SingleThreadDistributor&) = delete;
72	SingleThreadDistributor();
73	typedef std::function<void(std::unique_ptr<Answer>&, int)> callback_t;
74	int question(Question&, callback_t callback) override; //!< Submit a question to the Distributor
75	int getQueueSize() override {	×
76	return 0;	×
77	}	×
78
79	bool isOverloaded() override
80	{	×
81	return false;	×
82	}	×
83
84	private:
85	std::unique_ptr<Backend> b{nullptr};
86	};
87
88	template<class Answer, class Question, class Backend> class MultiThreadDistributor
89	: public Distributor<Answer, Question, Backend>
90	{
91	public:
92	MultiThreadDistributor(const MultiThreadDistributor&) = delete;
93	void operator=(const MultiThreadDistributor&) = delete;
94	MultiThreadDistributor(int n);
95	typedef std::function<void(std::unique_ptr<Answer>&, int)> callback_t;
96	int question(Question&, callback_t callback) override; //!< Submit a question to the Distributor
97	void distribute(int n);
98	int getQueueSize() override {	1✔
99	return d_queued;	1✔
100	}	1✔
101
102	struct QuestionData
103	{
104	QuestionData(const Question& query): Q(query)
105	{	1,203✔
106	start = Q.d_dt.udiff();	1,203✔
107	}	1,203✔
108
109	Question Q;
110	callback_t callback{nullptr};
111	int id{0};
112	int start{0};
113	};
114
115	bool isOverloaded() override
116	{	×
117	return d_overloadQueueLength && (d_queued > d_overloadQueueLength);	×
118	}	×
119
120	private:
121	std::vector<pdns::channel::Sender<QuestionData>> d_senders;
122	std::vector<pdns::channel::Receiver<QuestionData>> d_receivers;
123	time_t d_last_started{0};
124	std::atomic<unsigned int> d_queued{0};
125	unsigned int d_overloadQueueLength{0};
126	unsigned int d_maxQueueLength{0};
127	int d_nextid{0};
128	int d_num_threads{0};
129	};
130
131	template<class Answer, class Question, class Backend> Distributor<Answer,Question,Backend>* Distributor<Answer,Question,Backend>::Create(int n)
132	{	3✔
133	if( n == 1 )	3!
134	return new SingleThreadDistributor<Answer,Question,Backend>();	×
135	else	3✔
136	return new MultiThreadDistributor<Answer,Question,Backend>( n );	3✔
137	}	3✔
138
139	template<class Answer, class Question, class Backend>SingleThreadDistributor<Answer,Question,Backend>::SingleThreadDistributor()
140	{	×
141	g_log<<Logger::Error<<"Only asked for 1 backend thread - operating unthreaded"<<endl;	×
142	try {	×
143	b=make_unique<Backend>();	×
144	}	×
145	catch(const PDNSException &AE) {	×
146	g_log<<Logger::Error<<"Distributor caught fatal exception: "<<AE.reason<<endl;	×
147	_exit(1);	×
148	}	×
149	catch(const std::exception& e) {	×
150	g_log<<Logger::Error<<"Distributor caught fatal exception: "<<e.what()<<endl;	×
151	_exit(1);	×
152	}	×
153	catch(...) {	×
154	g_log<<Logger::Error<<"Caught an unknown exception when creating backend, probably"<<endl;	×
155	_exit(1);	×
156	}	×
157	}	×
158
159	template<class Answer, class Question, class Backend>MultiThreadDistributor<Answer,Question,Backend>::MultiThreadDistributor(int numberOfThreads) :
160	d_last_started(time(nullptr)), d_overloadQueueLength(::arg().asNum("overload-queue-length")), d_maxQueueLength(::arg().asNum("max-queue-length")), d_num_threads(numberOfThreads)
161	{	3✔
162	if (numberOfThreads < 1) {	3!
163	g_log<<Logger::Error<<"Asked for fewer than 1 threads, nothing to do"<<endl;	×
164	_exit(1);	×
165	}	×
166
167	for (int distributorIdx = 0; distributorIdx < numberOfThreads; distributorIdx++) {	17✔
168	auto [sender, receiver] = pdns::channel::createObjectQueue<QuestionData>(pdns::channel::SenderBlockingMode::SenderBlocking, pdns::channel::ReceiverBlockingMode::ReceiverBlocking);	14✔
169	d_senders.push_back(std::move(sender));	14✔
170	d_receivers.push_back(std::move(receiver));	14✔
171	}	14✔
172
173	g_log<<Logger::Warning<<"About to create "<<numberOfThreads<<" backend threads for UDP"<<endl;	3✔
174
175	for (int distributorIdx = 0; distributorIdx < numberOfThreads; distributorIdx++) {	17✔
176	std::thread t([=](){distribute(distributorIdx);});	14✔
177	t.detach();	14✔
178	Utility::usleep(50000); // we've overloaded mysql in the past :-)	14✔
179	}	14✔
180	g_log<<Logger::Warning<<"Done launching threads, ready to distribute questions"<<endl;	3✔
181	}	3✔
182
183
184	// start of a new thread
185	template<class Answer, class Question, class Backend>void MultiThreadDistributor<Answer,Question,Backend>::distribute(int ournum)
186	{	14✔
187	// this is the longest name we can use, not a typo
188	setThreadName("pdns/distributo");	14✔
189
190	try {	14✔
191	auto b = make_unique<Backend>(); // this will answer our questions	14✔
192	int queuetimeout = ::arg().asNum("queue-limit");	14✔
193	auto& receiver = d_receivers.at(ournum);	14✔
194
195	for (;;) {	1,207✔
196	auto tempQD = receiver.receive();	1,207✔
197	if (!tempQD) {	1,207!
198	unixDie("read");	×
199	}	×
200	--d_queued;	1,207✔
201	auto questionData = std::move(*tempQD);	1,207✔
202	std::unique_ptr<Answer> a = nullptr;	1,207✔
203	if (queuetimeout && questionData->Q.d_dt.udiff() > queuetimeout * 1000) {	1,207!
204	S.inc("timedout-packets");	×
205	continue;	×
206	}	×
207
208	bool allowRetry = true;	1,207✔
209	retry:	1,207✔
210	// this is the only point where we interact with the backend (synchronous)
211	try {	1,201✔
212	if (!b) {	1,201!
213	allowRetry = false;	1✔
214	b = make_unique<Backend>();	1✔
215	}	1✔
216	a = b->question(questionData->Q);	1,201✔
217	}	1,201✔
218	catch (const PDNSException &e) {	1,201✔
219	b.reset();	×
220	if (!allowRetry) {	×
221	g_log<<Logger::Error<<"Backend error: "<<e.reason<<endl;	×
222	a = questionData->Q.replyPacket();	×
223
224	a->setRcode(RCode::ServFail);	×
225	S.inc("servfail-packets");	×
226	S.ringAccount("servfail-queries", questionData->Q.qdomain, questionData->Q.qtype);	×
227	} else {	×
228	g_log<<Logger::Notice<<"Backend error (retry once): "<<e.reason<<endl;	×
229	goto retry;	×
230	}	×
231	}	×
232	catch (...) {	1,201✔
233	b.reset();	1✔
234	if (!allowRetry) {	1!
235	g_log<<Logger::Error<<"Caught unknown exception in Distributor thread "<<std::this_thread::get_id()<<endl;	×
236	a = questionData->Q.replyPacket();	×
237
238	a->setRcode(RCode::ServFail);	×
239	S.inc("servfail-packets");	×
240	S.ringAccount("servfail-queries", questionData->Q.qdomain, questionData->Q.qtype);	×
241	} else {	1✔
242	g_log<<Logger::Warning<<"Caught unknown exception in Distributor thread "<<std::this_thread::get_id()<<" (retry once)"<<endl;	1✔
243	goto retry;	1✔
244	}	1✔
245	}	1✔
246
247	questionData->callback(a, questionData->start);	1,199✔
248	#ifdef ENABLE_GSS_TSIG	1,199✔
249	if (g_doGssTSIG && a != nullptr) {	1,199!
250	questionData->Q.cleanupGSS(a->d.rcode);	×
251	}	×
252	#endif	1,199✔
253	questionData.reset();	1,199✔
254	}	1,199✔
255
256	b.reset();	6✔
257	}	6✔
258	catch (const PDNSException &AE) {	14✔
259	g_log<<Logger::Error<<"Distributor caught fatal exception: "<<AE.reason<<endl;	×
260	_exit(1);	×
261	}	×
262	catch (const std::exception& e) {	14✔
263	g_log<<Logger::Error<<"Distributor caught fatal exception: "<<e.what()<<endl;	×
264	_exit(1);	×
265	}	×
266	catch (...) {	14✔
267	g_log<<Logger::Error<<"Caught an unknown exception when creating backend, probably"<<endl;	×
268	_exit(1);	×
269	}	×
270	}	14✔
271
272	template<class Answer, class Question, class Backend>int SingleThreadDistributor<Answer,Question,Backend>::question(Question& q, callback_t callback)
273	{	×
274	int start = q.d_dt.udiff();	×
275	std::unique_ptr<Answer> a = nullptr;	×
276	bool allowRetry=true;	×
277	retry:	×
278	try {	×
279	if (!b) {	×
280	allowRetry=false;	×
281	b=make_unique<Backend>();	×
282	}	×
283	a=b->question(q); // a can be NULL!	×
284	}	×
285	catch(const PDNSException &e) {	×
286	b.reset();	×
287	if (!allowRetry) {	×
288	g_log<<Logger::Error<<"Backend error: "<<e.reason<<endl;	×
289	a=q.replyPacket();	×
290
291	a->setRcode(RCode::ServFail);	×
292	S.inc("servfail-packets");	×
293	S.ringAccount("servfail-queries", q.qdomain, q.qtype);	×
294	} else {	×
295	g_log<<Logger::Notice<<"Backend error (retry once): "<<e.reason<<endl;	×
296	goto retry;	×
297	}	×
298	}	×
299	catch(...) {	×
300	b.reset();	×
301	if (!allowRetry) {	×
302	g_log<<Logger::Error<<"Caught unknown exception in Distributor thread "<<std::this_thread::get_id()<<endl;	×
303	a=q.replyPacket();	×
304
305	a->setRcode(RCode::ServFail);	×
306	S.inc("servfail-packets");	×
307	S.ringAccount("servfail-queries", q.qdomain, q.qtype);	×
308	} else {	×
309	g_log<<Logger::Warning<<"Caught unknown exception in Distributor thread "<<std::this_thread::get_id()<<" (retry once)"<<endl;	×
310	goto retry;	×
311	}	×
312	}	×
313	callback(a, start);	×
314	#ifdef ENABLE_GSS_TSIG	×
315	if (g_doGssTSIG && a != nullptr) {	×
316	q.cleanupGSS(a->d.rcode);	×
317	}	×
318	#endif	×
319	return 0;	×
320	}	×
321
322	struct DistributorFatal{};
323
324	template<class Answer, class Question, class Backend>int MultiThreadDistributor<Answer,Question,Backend>::question(Question& q, callback_t callback)
325	{	1,203✔
326	// this is passed to other process over pipe and released there
327	auto questionData = std::make_unique<QuestionData>(q);	1,203✔
328	auto ret = questionData->id = d_nextid++; // might be deleted after write!	1,203✔
329	questionData->callback = callback;	1,203✔
330
331	++d_queued;	1,203✔
332	if (!d_senders.at(questionData->id % d_senders.size()).send(std::move(questionData))) {	1,203!
333	--d_queued;	×
334	questionData.reset();	×
335	unixDie("write");	×
336	}	×
337
338	if (d_queued > d_maxQueueLength) {	1,203!
339	g_log<<Logger::Error<< d_queued <<" questions waiting for database/backend attention. Limit is "<<::arg().asNum("max-queue-length")<<", respawning"<<endl;	1✔
340	// this will leak the entire contents of all pipes, nothing will be freed. Respawn when this happens!
341	throw DistributorFatal();	1✔
342	}	1✔
343
344	return ret;	1,202✔
345	}	1,203✔

PowerDNS / pdns / 12595591960

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