// The contents of this file are subject to the BOINC Public License
// Version 1.0 (the "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of the License at
// http://boinc.berkeley.edu/license_1.0.txt
//
// Software distributed under the License is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
// License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is the Berkeley Open Infrastructure for Network Computing.
//
// The Initial Developer of the Original Code is the SETI@home project.
// Portions created by the SETI@home project are Copyright (C) 2002
// University of California at Berkeley. All Rights Reserved.
//
// Contributor(s):
//

// The BOINC scheduling server.
//
// command-line options:

#include <cassert>
#include <cstdio>
#include <vector>
#include <string>
using namespace std;

#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>

#include "boinc_db.h"
#include "parse.h"
#include "filesys.h"
#include "error_numbers.h"
#include "shmem.h"
#include "util.h"

#include "sched_config.h"
#include "server_types.h"
#include "handle_request.h"
#include "sched_util.h"
#include "sched_msgs.h"
#include "main.h"

#ifdef _USING_FCGI_
#include "fcgi_stdio.h"
#endif

#define DEBUG_LEVEL  999

void get_log_path(char* p) {
    char buf[256];
    char path[256];
    gethostname(buf, 256);
    sprintf(path, "../log_%s", buf);
    mkdir(path, 0777);
    sprintf(p, "%s/cgi.log", path);
}

#define REQ_FILE_PREFIX "boinc_req_"
#define REPLY_FILE_PREFIX "boinc_reply_"
bool use_files = false;     // use disk files for req/reply msgs (for debugging)

SCHED_CONFIG config;
key_t sema_key;
int g_pid;

void send_message(char* msg, int delay) {
    fprintf(
        stdout,
        "Content-type: text/plain\n\n"
        "<scheduler_reply>\n"
        "    <message priority=\"low\">%s</message>\n"
        "    <request_delay>%d</request_delay>\n"
        "    <project_is_down/>\n"
        "</scheduler_reply>\n",
        msg, delay
    );
}

static bool db_opened=false;
int open_database() {
    int retval;

    if (db_opened) return 0;

    retval = boinc_db.open(config.db_name, config.db_host, config.db_user, config.db_passwd);
    if (retval) {
        log_messages.printf(SCHED_MSG_LOG::CRITICAL, "can't open database\n");
        return retval;
    }
    db_opened = true;
    return 0;
}

int main() {
    FILE* fin, *fout;
    int i, retval;
    char req_path[256], reply_path[256], path[256];
    SCHED_SHMEM* ssp=0;
    void* p;
    unsigned int counter=0;
    char* code_sign_key;
    bool project_stopped = false;

#ifndef _USING_FCGI_
    get_log_path(path);
    if (!freopen(path, "a", stderr)) {
        fprintf(stderr, "Can't redirect stderr\n");
        send_message("Server can't open log file", 3600);
        exit(0);
    }
#endif

    log_messages.set_debug_level(DEBUG_LEVEL);

    if (check_stop_sched()) {
        send_message("Project is temporarily shut down for maintenance", 3600);
        goto done;
    }

    retval = config.parse_file("..");
    if (retval) {
        log_messages.printf(SCHED_MSG_LOG::CRITICAL, "Can't parse config file\n");
        send_message("Server can't parse configuration file", 3600);
        exit(0);
    }

    sprintf(path, "%s/code_sign_public", config.key_dir);
    retval = read_file_malloc(path, code_sign_key);
    if (retval) {
        log_messages.printf(SCHED_MSG_LOG::CRITICAL,
            "Can't read code sign key file (%s)\n", path
        );
        send_message("Server can't find key file", 3600);
        exit(0);
    }

    get_project_dir(path, sizeof(path));
    get_key(path, 'a', sema_key);

    retval = attach_shmem(config.shmem_key, &p);
    if (retval) {
        log_messages.printf(SCHED_MSG_LOG::CRITICAL,
            "Can't attach shmem (feeder not running?)\n"
        );
        project_stopped = true;
    } else {
        ssp = (SCHED_SHMEM*)p;
        retval = ssp->verify();
        if (retval) {
            log_messages.printf(SCHED_MSG_LOG::CRITICAL,
                "shmem has wrong struct sizes - recompile\n"
            );
            send_message("Server has software problem", 3600);
            exit(0);
        }

        for (i=0; i<10; i++) {
            if (ssp->ready) break;
            log_messages.printf(SCHED_MSG_LOG::DEBUG, "waiting for ready flag\n");
            sleep(1);
        }
        if (!ssp->ready) {
            log_messages.printf(SCHED_MSG_LOG::CRITICAL, "feeder doesn't seem to be running\n");
            send_message("Server has software problem", 3600);
            exit(0);
        }
    }

    g_pid = getpid();
#ifdef _USING_FCGI_
    while(FCGI_Accept() >= 0) {
        counter++;
#endif
        if (project_stopped) {
            send_message("Project is temporarily shut down for maintenance", 3600);
            goto done;
        }
        fprintf(stdout,"Content-type: text/plain\n\n");
        if (use_files) {
            // the code below is convoluted because,
            // instead of going from stdin to stdout directly,
            // we go via a pair of disk files
            // (this makes it easy to save the input,
            // and to know the length of the output).
            //
            sprintf(req_path, "%s%d_%u", REQ_FILE_PREFIX, g_pid, counter);
            sprintf(reply_path, "%s%d_%u", REPLY_FILE_PREFIX, g_pid, counter);
            fout = fopen(req_path, "w");
            if (!fout) {
                log_messages.printf(SCHED_MSG_LOG::CRITICAL, "can't write request file\n");
                exit(1);
            }
            copy_stream(stdin, fout);
            fclose(fout);
            fin = fopen(req_path, "r");
            if (!fin) {
                log_messages.printf(SCHED_MSG_LOG::CRITICAL, "can't read request file\n");
                exit(1);
            }
            fout = fopen(reply_path, "w");
            if (!fout) {
                log_messages.printf(SCHED_MSG_LOG::CRITICAL, "can't write reply file\n");
                exit(1);
            }
            handle_request(fin, fout, *ssp, code_sign_key);
            fclose(fin);
            fclose(fout);
            fin = fopen(reply_path, "r");
            if (!fin) {
                log_messages.printf(SCHED_MSG_LOG::CRITICAL, "can't read reply file\n");
                exit(1);
            }
            copy_stream(fin, stdout);
            fclose(fin);
            //unlink(req_path);
            //unlink(reply_path);
        } else {
            handle_request(stdin, stdout, *ssp, code_sign_key);
        }
done:
#ifdef _USING_FCGI_
        continue;
    }
#endif
    if (db_opened) {
        boinc_db.close();
    }
}