projects/smsdaemon/Spooler.cpp

#include "Spooler.h"
#include <iostream>
#include <string>
#include <stdexcept>
#include <cstring>
#include <fstream>
#include <sstream>
#include <iomanip>
#include <errno.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <dirent.h>
#include <fcntl.h>
#include <stdlib.h>

#include "Util.h"

#include "Exceptions.h"

const std::string spooldir = "/var/spool/smsdaemon/";

using namespace std;


void errnoException(std::string msg = "")
{
        if (msg != "")
                msg += ": ";
        msg += std::string(strerror(errno));
        throw std::runtime_error(msg);
}


void Spooler::enqueue(std::string recipient, std::string message)
{
        bool error = false;
        lock();
        std::string file = findSpoolFilename();
        std::ofstream out(file.c_str());
        if (out) {
                out << recipient << "\n" << message;
                out.close();
        } else {
                error = true;
        }
        unlock();
        
        if (error)
                throw std::runtime_error("Could not create spoolfile");
        this->filename = file;
}

std::string Spooler::dequeue()
{
        lock();

        DIR* dir = opendir( spooldir.c_str() );
        if (dir == 0)
                errnoException();

        string file;
        string message; 
        dirent* entry;
        while ( (entry = readdir(dir)) != 0) 
        {
                if (entry->d_name[0] == '.' ) 
                {
                        continue;
                }
                else
                {
                        file = spooldir + string(entry->d_name);
                        break;
                }

        }

        closedir(dir);

        if (file != "") {
                message = Util::readfile(file);
                ::unlink(file.c_str());
        }

        unlock();

        this->filename = file;

        if (file != "")
                return message;
        else
                throw filenotfoundexception();
}

std::string Spooler::findSpoolFilename()
{
        std::string file;
        std::stringstream ss;

        int retrycount = 0;

        while(1) {
                ss.str(std::string()); //clear
                ss << std::setw(8) << std::setfill('0') << std::uppercase  << std::hex << rand();

                string file = spooldir;
                file += ss.str().c_str();

                int fd = ::open(file.c_str(), O_WRONLY | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR | S_IRGRP| S_IROTH);
                retrycount ++;

                if (fd != -1) {
                        ::close(fd);
                        return file;
                }
                int err = errno;
                ::close(fd);

                if (err == EEXIST) {
                        continue;
                }

                if (retrycount > 20)
                        throw std::runtime_error("to many retry attempt at creating spool file");

                throw std::runtime_error("no access to spool directory");       

        }
}

void Spooler::lock()
{
        lockfd = open(spooldir.c_str() , O_RDONLY);

        if (lockfd == -1) {
                errnoException("Couldn open lockfile");
        }

        int status = flock(lockfd, LOCK_EX);

        if (status == -1) {
                errnoException();
        }
}

void Spooler::unlock()
{
        flock(lockfd, LOCK_UN);
        close(lockfd);
}

string Spooler::getFilename()
{
        return filename;
}
1	torben	132	#include "Spooler.h"
2			#include <iostream>
3			#include <string>
4			#include <stdexcept>
5			#include <cstring>
6			#include <fstream>
7			#include <sstream>
8			#include <iomanip>
9			#include <errno.h>
10
11			#include <sys/types.h>
12			#include <sys/stat.h>
13			#include <sys/file.h>
14			#include <dirent.h>
15			#include <fcntl.h>
16			#include <stdlib.h>
17
18	torben	158	#include "Util.h"
19	torben	132
20			#include "Exceptions.h"
21
22			const std::string spooldir = "/var/spool/smsdaemon/";
23
24			using namespace std;
25
26
27			void errnoException(std::string msg = "")
28			{
29			if (msg != "")
30			msg += ": ";
31			msg += std::string(strerror(errno));
32			throw std::runtime_error(msg);
33			}
34
35
36
37			void Spooler::enqueue(std::string recipient, std::string message)
38			{
39			bool error = false;
40			lock();
41	torben	134	std::string file = findSpoolFilename();
42	torben	132	std::ofstream out(file.c_str());
43			if (out) {
44			out << recipient << "\n" << message;
45			out.close();
46			} else {
47			error = true;
48			}
49			unlock();
50
51			if (error)
52			throw std::runtime_error("Could not create spoolfile");
53	torben	134	this->filename = file;
54	torben	132	}
55
56			std::string Spooler::dequeue()
57			{
58			lock();
59
60			DIR* dir = opendir( spooldir.c_str() );
61			if (dir == 0)
62			errnoException();
63
64			string file;
65			string message;
66			dirent* entry;
67			while ( (entry = readdir(dir)) != 0)
68			{
69			if (entry->d_name[0] == '.' )
70			{
71			continue;
72			}
73			else
74			{
75			file = spooldir + string(entry->d_name);
76			break;
77			}
78
79			}
80
81			closedir(dir);
82
83			if (file != "") {
84			message = Util::readfile(file);
85			::unlink(file.c_str());
86			}
87
88			unlock();
89
90	torben	134	this->filename = file;
91
92	torben	132	if (file != "")
93			return message;
94			else
95			throw filenotfoundexception();
96			}
97
98	torben	134	std::string Spooler::findSpoolFilename()
99	torben	132	{
100			std::string file;
101			std::stringstream ss;
102
103			int retrycount = 0;
104
105			while(1) {
106			ss.str(std::string()); //clear
107			ss << std::setw(8) << std::setfill('0') << std::uppercase << std::hex << rand();
108
109			string file = spooldir;
110			file += ss.str().c_str();
111
112			int fd = ::open(file.c_str(), O_WRONLY \| O_CREAT \| O_EXCL, S_IRUSR \| S_IWUSR \| S_IRGRP\| S_IROTH);
113			retrycount ++;
114
115			if (fd != -1) {
116			::close(fd);
117			return file;
118			}
119	torben	155	int err = errno;
120			::close(fd);
121	torben	132
122	torben	155	if (err == EEXIST) {
123	torben	132	continue;
124	torben	155	}
125	torben	132
126			if (retrycount > 20)
127			throw std::runtime_error("to many retry attempt at creating spool file");
128
129			throw std::runtime_error("no access to spool directory");
130
131			}
132			}
133
134			void Spooler::lock()
135			{
136	torben	155	lockfd = open(spooldir.c_str() , O_RDONLY);
137	torben	132
138	torben	155	if (lockfd == -1) {
139	torben	132	errnoException("Couldn open lockfile");
140			}
141
142	torben	155	int status = flock(lockfd, LOCK_EX);
143	torben	132
144			if (status == -1) {
145			errnoException();
146			}
147			}
148
149			void Spooler::unlock()
150			{
151	torben	155	flock(lockfd, LOCK_UN);
152			close(lockfd);
153	torben	132	}
154	torben	134
155			string Spooler::getFilename()
156			{
157			return filename;
158			}