Added process manager

configs/ncsambawatcher.service

@@ -1,7 +1,6 @@
 [Unit]
 Description=A service which scan Nextcloud folders
-After=network.target docker.service
-Requires=docker.service
+After=network.target
 
 [Service]
 ExecStart=/usr/bin/ncsambawatcher

src/guarder.h

@@ -4,37 +4,26 @@
 #include <sys/types.h>
 #include <sys/shm.h>
 #include <sys/ipc.h>
-#include <sys/sem.h>
-#include <unistd.h>
 
 class guarder{
 private:
     const int shmid;
-    const int semid;
-
-    void semaphoreOp(int op) {
-        struct sembuf sb{};
-        sb.sem_num = 0;
-        sb.sem_op = op;
-        sb.sem_flg = 0;
-        semop(semid, &sb, 1);
-    }
 
     void setFlag(bool value)
     {
-        semaphoreOp(-1);
         bool *flag = static_cast<bool *>(shmat(shmid, nullptr, 0));
         *flag = value;
         shmdt(flag);
-        semaphoreOp(1);
     }
 
 public:
-    guarder() : shmid(shmget(IPC_PRIVATE, sizeof(bool), 0666 | IPC_CREAT)), semid(semget(IPC_PRIVATE, 1, 0666 | IPC_CREAT))
+    guarder() : shmid(shmget(IPC_PRIVATE, sizeof(bool), 0666 | IPC_CREAT))
     {
         setFlagOff();
     }
 
+    guarder(guarder &g) : shmid(g.shmid) {}
+
     void setFlagOff()
     {
         setFlag(false);
@@ -47,18 +36,15 @@ public:
 
     bool isFlagOn()
     {
-        semaphoreOp(-1);
         bool *flag = static_cast<bool *>(shmat(shmid, nullptr, 0));
         bool ret = *flag;
         shmdt(flag);
-        semaphoreOp(1);
         return ret;
     }
 
     ~guarder()
     {
         shmctl(shmid, IPC_RMID, nullptr);
-        semctl(semid, 0, IPC_RMID);
     }
 
 };

src/main.cpp

@@ -1,102 +1,120 @@
-#include <stdio.h>
-#include <unistd.h>
-#include <sys/wait.h>
 #include <iostream>
-#include <thread>
-#include <vector>
-#include <set>
 #include <array>
 #include <string>
-#include <mutex>
-#include <condition_variable>
-#include <cstdio>
+#include <vector>
+#include <unistd.h>
+#include <sys/types.h>
+#include <syslog.h>
+#include <fcntl.h>
+#include <signal.h>
+#include "locations.h"
 #include "usermanager.h"
+#include "guarder.h"
+#include "processManager.h"
 
+#define MAXNAMESIZE 255
+#define SCAN_DONE_SIG SIGRTMIN
 #define SCAN_CMD_USR "docker exec --user www-data nextcloud /var/www/html/occ files:scan --path="
 
+int p1[2];
+guarder guard;
 userManager manager;
-std::condition_variable cv;
-std::mutex mtx;
 
-void readingThreadFunc()
+void flushManagerToPipe()
 {
-    FILE *logpipe = popen(LOGFILE, "r");
-    std::array<char, 256> buffer;
-
-    while (fgets(buffer.data(), buffer.size(), logpipe) != nullptr)
+    if (!guard.isFlagOn())
     {
-        std::string line(buffer.data());
-
-        if (line.find('|') == std::string::npos)
-            continue;
-
-        std::vector<std::string> x = splitLogFile(line, '|');
-        std::string user(x.at(USER_LOG_LOCATION));
+        std::vector<std::string> users = manager.getFlaggedUsers();
 
+        for (std::vector<std::string>::iterator it = users.begin(); it != users.end(); ++it)
         {
-            std::lock_guard<std::mutex> lock(mtx);
-            manager.addUser(user);
-            manager.setUserFlagged(user);
+            int size = it->size();
+            write(p1[1], &size, sizeof(int));
+            write(p1[1], it->data(), size * sizeof(char));
         }
 
-        cv.notify_one();
-
-        std::cout << "User find: " << user << std::endl;
+        manager.unflagAllUsers();
     }
 }
 
-void scannerThreadFunc()
+void handler(int sig) 
 {
-    std::unique_lock<std::mutex> lock(mtx);
-    std::vector<pid_t> childrens;
-    while (true)
+    if (sig == SCAN_DONE_SIG)
     {
-        cv.wait(lock, []
-                { return manager.isAnybodyFlagged(); });
-
-        std::set<std::string> scanUsers = manager.getFlaggedUsers();
-        manager.unflagAllUsers();
-
-        lock.unlock();
-        childrens.clear();
-
-        for (const std::string& user : scanUsers)
-        {
-            pid_t child = fork();
-
-            if (child < 0)
-            {
-                std::cerr << "Fork failed for: " << user << std::endl;
-            }
-            else if (child == 0) // child
-            {
-                std::string cmd = (std::string(SCAN_CMD_USR) + user);
-                execl("/bin/sh", "sh", "-c", cmd.c_str(), static_cast<char *>(nullptr));
-                std::cerr << "Scan failed" << std::endl;
-                _exit(EXIT_FAILURE);
-            }
-            else // parent
-            {
-                childrens.push_back(child);
-            }
-        }
-
-        for (const pid_t& pid : childrens)
-        {
-            waitpid(pid, nullptr, 0);
-        }
-
-        lock.lock();
+        flushManagerToPipe();
     }
 }
 
 int main()
 {
-    std::thread readingThread(readingThreadFunc);
-    std::thread scannerThread(scannerThreadFunc);
+    openlog("ncsambawatcher", LOG_PID | LOG_CONS, LOG_USER);
+    pipe(p1);
 
-    readingThread.join();
-    scannerThread.join();
+    pid_t parent = getpid();
+    pid_t child = fork();
 
-    return 0;
+    if (child > 0) // parent
+    {
+        signal(SCAN_DONE_SIG, handler);
+        close(p1[0]); // read
+
+        FILE *logpipe = popen(LOGFILE, "r");
+        std::array<char, 256> buffer;
+
+        while (fgets(buffer.data(), buffer.size(), logpipe) != nullptr)
+        {
+            std::string line(buffer.data());
+
+            if (line.find('|') == std::string::npos)
+                continue;
+
+            std::vector<std::string> x = splitLogFile(line, '|');
+            std::string user(x.at(USER_LOG_LOCATION));
+            manager.addUser(user);
+            manager.setUserFlagged(user);
+
+            std::cout << "User find: " << user << std::endl;
+
+            flushManagerToPipe();
+        }
+
+        fclose(logpipe);
+        close(p1[1]); // write
+    }
+    else // child
+    {
+        close(p1[1]); // write
+
+        int size;
+        char *buffer = nullptr;
+        processManager pm;
+
+        while (read(p1[0], &size, sizeof(int)))
+        {
+            if (buffer == nullptr)
+                buffer = new char[size];
+
+            read(p1[0], buffer, size * sizeof(char));
+            std::string name(buffer);
+            std::string cmd = std::string(SCAN_CMD_USR) + name;
+
+            std::cout << "Scan received for: " << name << std::endl;
+
+            pm.runTask(name, cmd);
+
+            kill(parent, SCAN_DONE_SIG);
+
+            if (buffer != nullptr)
+            {
+                delete[] buffer;
+                buffer = nullptr;
+            }
+        }
+
+        close(p1[0]); // read
+    }
+
+    closelog();
+
+    return EXIT_SUCCESS;
 }

src/processManager.h

@@ -0,0 +1,41 @@
+#ifndef _PROCCESSMANAGER_H
+#define _PROCCESSMANAGER_H
+
+#include <map>
+#include <string>
+#include <unistd.h>
+#include <sys/types.h>
+#include "guarder.h"
+#include "usermanager.h"
+
+class processManager
+{
+private:
+    std::map<std::string, guarder> running;
+
+    bool getIdTag(std::string &id)
+    {
+        return running[id].isFlagOn();
+    }
+
+
+public:  
+
+    void runTask(std::string &id, std::string &cmdCommand)
+    {
+        if (!getIdTag(id))
+        {
+            running[id].setFlagOn();
+            pid_t child = fork();
+
+            if (child == 0) // child
+            {
+                system(cmdCommand.c_str());
+                running[id].setFlagOff();
+                exit(EXIT_SUCCESS);
+            }
+        }
+    }
+};
+
+#endif // _PROCCESSMANAGER_H

src/usermanager.h

@@ -4,9 +4,7 @@
 #include <string>
 #include <map>
 #include <vector>
-#include <set>
 #include <sstream>
-#include <mutex>
 #include "locations.h"
 
 std::vector<std::string> splitLogFile(const std::string& input, char delimiter);
@@ -15,7 +13,6 @@ class userManager
 {
 private:
     std::map<std::string, bool> users;
-    std::mutex mtx;
 
 public:
     
@@ -26,7 +23,6 @@ public:
 
     void addUser(std::string &user)
     {
-        std::lock_guard<std::mutex> lock(mtx);
         if (users.count(user) == 0)
         {
             users[user] = false;
@@ -35,19 +31,16 @@ public:
 
     void removeUser(std::string &user)
     {
-        std::lock_guard<std::mutex> lock(mtx);
         users.erase(user);
     }
 
     bool isContains(std::string &user)
     {
-        std::lock_guard<std::mutex> lock(mtx);
         return users.count(user) == 1;
     }
 
     void setUserFlagged(std::string &user)
     {
-        std::lock_guard<std::mutex> lock(mtx);
         if (users.count(user) == 1)
         {
             users[user] = true;
@@ -56,7 +49,6 @@ public:
 
     void setUserUnflagged(std::string &user)
     {
-        std::lock_guard<std::mutex> lock(mtx);
         if (users.count(user) == 1)
         {
             users[user] = false;
@@ -65,56 +57,38 @@ public:
 
     void unflagAllUsers()
     {
-        std::lock_guard<std::mutex> lock(mtx);
         for (std::map<std::string, bool>::iterator it = users.begin(); it != users.end(); ++it)
         {
             it->second = false;
         }
     }
 
-    std::set<std::string> getUsers()
+    std::vector<std::string> getUsers()
     {
-        std::set<std::string> ret;
-
-        std::lock_guard<std::mutex> lock(mtx);
+        std::vector<std::string> ret;
 
         for (std::map<std::string, bool>::iterator it = users.begin(); it != users.end(); ++it)
         {
-            ret.insert(it->first);
+            ret.push_back(it->first);
         }
 
         return ret;
     }
 
-    std::set<std::string> getFlaggedUsers()
+    std::vector<std::string> getFlaggedUsers()
     {
-        std::set<std::string> ret;
-
-        std::lock_guard<std::mutex> lock(mtx);
+        std::vector<std::string> ret;
 
         for (std::map<std::string, bool>::iterator it = users.begin(); it != users.end(); ++it)
         {
             if (it->second)
             {
-                ret.insert(it->first);
+                ret.push_back(it->first);
             }
         }
 
         return ret;
     }
-
-    bool isAnybodyFlagged()
-    {
-        std::lock_guard<std::mutex> lock(mtx);
-    
-        for (std::map<std::string, bool>::iterator it = users.begin(); it != users.end(); ++it)
-        {
-            if (it->second)
-                return true;
-        }
-
-        return false;
-    }
 };
 
 #endif // _USERMAN_H