329 lines
10 KiB
C++
329 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include <dirent.h>
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#include <dlfcn.h>
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#include <ftw.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <cassert>
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#include <iostream>
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#include <mutex>
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#include <condition_variable>
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#include <Poco/Timestamp.h>
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#include <Poco/StringTokenizer.h>
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#include "Common.hpp"
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#include "IoUtil.hpp"
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#include "LOOLProtocol.hpp"
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#include <LOOLWebSocket.hpp>
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#include "Log.hpp"
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#include "Unit.hpp"
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#include "Util.hpp"
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const int NumToPrefork = 20;
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// Inside the WSD process
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class UnitPrefork : public UnitWSD
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{
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std::string _failure;
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Poco::Timestamp _startTime;
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size_t _childPSS;
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size_t _childDirty;
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std::mutex _mutex;
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std::condition_variable _cv;
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std::vector< std::shared_ptr<LOOLWebSocket> > _childSockets;
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public:
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UnitPrefork()
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: _childPSS(0),
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_childDirty(0)
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{
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setHasKitHooks();
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#ifdef TEST_DIRTY_NUMBERS
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setTimeout(100 * 1000);
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#endif
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}
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virtual void preSpawnCount(int &numPrefork) override
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{
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numPrefork = NumToPrefork;
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}
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virtual bool filterChildMessage(const std::vector<char>& payload) override
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{
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const std::string memory = LOOLProtocol::getFirstLine(payload);
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Poco::StringTokenizer tokens(memory, " ");
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if (tokens[0] == "error:")
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{
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_failure = memory;
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}
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else
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{
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LOG_INF("Got memory stats [" << memory << "].");
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assert(tokens.count() == 2);
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_childPSS = atoi(tokens[0].c_str());
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_childDirty = atoi(tokens[1].c_str());
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}
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// Don't signal before wait.
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std::unique_lock<std::mutex> lock(_mutex);
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_cv.notify_one();
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return true;
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}
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virtual void newChild(const std::shared_ptr<LOOLWebSocket> &socket) override
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{
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std::unique_lock<std::mutex> lock(_mutex);
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_childSockets.push_back(socket);
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LOG_INF("Unit-prefork: got new child, have " << _childSockets.size() << " of " << NumToPrefork);
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if (_childSockets.size() >= NumToPrefork)
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{
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Poco::Timestamp::TimeDiff elapsed = _startTime.elapsed();
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const auto totalTime = (1000. * elapsed)/Poco::Timestamp::resolution();
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LOG_INF("Launched " << _childSockets.size() << " in " << totalTime);
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size_t totalPSSKb = 0;
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size_t totalDirtyKb = 0;
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// Skip the last one as it's not completely initialized yet.
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for (size_t i = 0; i < _childSockets.size() - 1; ++i)
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{
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LOG_INF("Getting memory of child #" << i + 1 << " of " << _childSockets.size());
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_childSockets[i]->sendFrame("unit-memdump: \n", sizeof("unit-memdump: \n"));
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if (_cv.wait_for(lock, std::chrono::milliseconds(5 * 1000)) == std::cv_status::timeout)
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{
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_failure = "Timed out waiting for child to respond to unit-memdump.";
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std::cerr << _failure << std::endl;
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exitTest(TestResult::TEST_FAILED);
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return;
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}
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std::cerr << "child # " << i + 1 << " pss: " << _childPSS << " (totalPSS: " << (totalPSSKb + _childPSS)
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<< "), dirty: " << _childDirty << " (totalDirty: " << (totalDirtyKb + _childDirty) << std::endl;
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totalPSSKb += _childPSS;
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_childPSS = 0;
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totalDirtyKb += _childDirty;
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_childDirty = 0;
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}
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std::cerr << "Memory use total " << totalPSSKb << "k shared "
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<< totalDirtyKb << "k dirty" << std::endl;
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totalPSSKb /= _childSockets.size();
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totalDirtyKb /= _childSockets.size();
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std::cerr << "Memory use average " << totalPSSKb << "k shared "
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<< totalDirtyKb << "k dirty" << std::endl;
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std::cerr << "Launch time total " << totalTime << " ms" << std::endl;
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std::cerr << "Launch time average " << (totalTime / _childSockets.size()) << " ms" << std::endl;
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if (!_failure.empty())
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{
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std::cerr << "UnitPrefork failed due to: " << _failure << std::endl;
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exitTest(TestResult::TEST_FAILED);
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}
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else
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{
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std::cerr << "UnitPrefork success." << std::endl;
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exitTest(TestResult::TEST_OK);
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}
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}
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}
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};
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namespace
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{
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std::vector<int> pids;
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const char *startsWith(const char *line, const char *tag)
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{
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int len = strlen(tag);
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if (!strncmp(line, tag, len))
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{
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while (!isdigit(line[len]) && line[len] != '\0')
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++len;
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const auto str = std::string(line + len, strlen(line + len) - 1);
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return line + len;
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}
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return nullptr;
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}
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std::string readMemorySizes(FILE *inStream)
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{
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size_t numPSSKb = 0;
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size_t numDirtyKb = 0;
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char line[4096] = { 0 };
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while (fgets(line, sizeof (line), inStream))
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{
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const char *value;
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if ((value = startsWith(line, "Private_Dirty:")) ||
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(value = startsWith(line, "Shared_Dirty:")))
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numDirtyKb += atoi(value);
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else if ((value = startsWith(line, "Pss:")))
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numPSSKb += atoi(value);
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}
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std::ostringstream oss;
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oss << numPSSKb << " " << numDirtyKb;
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const auto res = oss.str();
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LOG_INF("readMemorySize: [" << res << "].");
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if (res.empty())
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{
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LOG_ERR("Failed to read memory stats.");
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throw std::runtime_error("Failed to read memory stats.");
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}
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return res;
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}
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}
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// Inside the forkit & kit processes
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class UnitKitPrefork : public UnitKit
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{
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FILE *_procSMaps;
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std::string _failure;
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public:
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UnitKitPrefork()
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: _procSMaps(NULL)
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{
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std::cerr << "UnitKit Prefork init !\n";
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}
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~UnitKitPrefork()
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{
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if (_procSMaps)
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fclose(_procSMaps);
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}
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virtual void launchedKit(int pid) override
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{
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// by the magic of forking - this should appear
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// in the last kit child nearly fully formed.
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pids.push_back(pid);
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}
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// Check that we have no unexpected open sockets.
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void checkSockets()
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{
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DIR *fds = opendir ("/proc/self/fd");
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struct dirent *ent;
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int deviceCount = 0, rdbCount = 0, resCount = 0,
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numSockets = 0, numUnexpected = 0, pipeCount = 0;
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while ((ent = readdir(fds)))
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{
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if (ent->d_name[0] == '.')
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continue;
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char name[1024 + 32];
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char buffer[4096];
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strcpy (name, "/proc/self/fd/");
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strncat(name, ent->d_name, 1024);
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size_t len;
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memset(buffer, 0, sizeof(buffer));
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if ((len = readlink(name, buffer, sizeof(buffer)-1) > 0))
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{
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assert(len<sizeof(buffer));
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numSockets++;
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char *extDot = strrchr(buffer, '.');
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LOG_INF("fd:" << ent->d_name << " -> " << buffer);
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if (!strncmp(buffer, "/dev/", sizeof ("/dev/") -1))
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deviceCount++;
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else if (extDot && !strcmp(extDot, ".res"))
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resCount++;
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else if (extDot && !strcmp(extDot, ".rdb"))
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rdbCount++;
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else if (strstr(buffer, "unit-prefork.log") || // our log
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strstr(buffer, "loolwsd.log") || // debug log
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(strstr(buffer, "/proc/") && // our readdir
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strstr(buffer, "/fd")))
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; // ignore
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else if (!strncmp(buffer, "pipe:[", 6))
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pipeCount++;
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else
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{
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fprintf(stderr, "Unexpected descriptor: %s -> %s\n", ent->d_name, buffer);
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numUnexpected++;
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}
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}
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}
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fprintf(stderr, "%d devices, %d rdb %d resources, %d pipes, %d descriptors total: %d unexpected\n",
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deviceCount, rdbCount, resCount, pipeCount, numSockets, numUnexpected);
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// 3 Pipes at most: 1 input, 1 output, file redirection (or so I imagine them).
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if (pipeCount > 3 || numUnexpected > 0)
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_failure = std::string("Error: unexpected inherited sockets ") +
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std::to_string(numUnexpected) + " and pipes " +
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std::to_string(pipeCount);
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}
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virtual void postFork() override
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{
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checkSockets();
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// before we drop the caps we can even open our /proc files !
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const std::string procName = std::string("/proc/") +
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std::to_string(getpid()) +
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std::string("/smaps");
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_procSMaps = fopen(procName.c_str(), "r");
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if (_procSMaps == NULL)
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{
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_failure = "Failed to open process: " + procName;
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throw std::runtime_error(_failure);
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}
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}
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virtual bool filterKitMessage(const std::shared_ptr<LOOLWebSocket> &ws,
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std::string &message) override
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{
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const auto token = LOOLProtocol::getFirstToken(message);
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if (token == "unit-memdump:")
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{
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#ifdef TEST_DIRTY_NUMBERS
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// Jitter the numbers so they're not all the same.
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struct timeval t;
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gettimeofday(&t, NULL);
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srand(t.tv_usec);
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size_t size = ((size_t)rand() * 4096 * 1024) / RAND_MAX;
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std::cerr << "allocate " << size << std::endl;
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memset (malloc (size), 0, size);
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#endif
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std::string memory;
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if (!_failure.empty())
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memory = _failure;
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else
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memory = readMemorySizes(_procSMaps);
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LOG_INF("filterKitMessage sending back: [" << memory << "].");
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ws->sendFrame(memory.c_str(), memory.length());
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return true;
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}
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return false;
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}
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};
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UnitBase *unit_create_wsd(void)
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{
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return new UnitPrefork();
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}
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UnitBase *unit_create_kit(void)
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{
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return new UnitKitPrefork();
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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