/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
// 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):
//

// db_purge:
// purge workunit and result records that are no longer needed from
// the database

#include <cstdio>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <cstring>
#include <cstdlib>
#include <ctime>
#include <string>
#include <time.h>
#include <errno.h>

using namespace std;

#include "boinc_db.h"
#include "util.h"
#include "parse.h"
#include "sched_config.h"
#include "sched_util.h"
#include "sched_msgs.h"

#include "error_numbers.h"

#define LOCKFILE "db_purge.out"
#define PIDFILE  "db_purge.pid"

#define WU_FILENAME_PREFIX              "wu_archive"
#define RESULT_FILENAME_PREFIX          "result_archive"
#define WU_INDEX_FILENAME_PREFIX        "wu_index"
#define RESULT_INDEX_FILENAME_PREFIX    "result_index"

#define DB_QUERY_LIMIT                  1000

SCHED_CONFIG    config;
FILE            *wu_stream=NULL;
FILE            *re_stream=NULL;
FILE            *wu_index_stream=NULL;
FILE            *re_index_stream=NULL;
int             time_int=0;

// These is used if limiting the total number of workunits to eliminate
int purged_workunits= 0;

// If non-negative, maximum number of workunits to purge. Since all
// results associated with a purged workunit are also purged, this
// also limits the number of purged results.
int max_number_workunits_to_purge=-1;

// set on command line if compression of archives is desired
#define COMPRESSION_NONE    0
#define COMPRESSION_GZIP    1
#define COMPRESSION_ZIP     2

// subscripts MUST be in agreement with defines above
char *suffix[3]={"", ".gz", ".zip"};

// default is no compression
int compress=COMPRESSION_NONE;

// set on command line if archive files should be closed and re-opened
// after getting some max no of WU in the file
int max_wu_per_file=0;

// keep track of how many WU archived in file so far
int wu_stored_in_file=0;

// this opens the archive.  Only subtle thing is that if the user has
// asked for compression, then we popen(2) a pipe to gzip or zip.
// This does 'in place' compression.
//
void open_archive(char* filename_prefix, FILE*& f){
    char path[256];
    char command[512];

    // append appropriate suffix for file type
    sprintf(path, "../archives/%s_%d.xml", filename_prefix, time_int);
    strcat(path, suffix[compress]);

    // and construct appropriate command if needed
    if (compress==COMPRESSION_GZIP)
        sprintf(command, "gzip - > %s", path);
   
    if (compress==COMPRESSION_ZIP)
        sprintf(command, "zip %s -", path);

    log_messages.printf(SCHED_MSG_LOG::NORMAL, "Opening archive %s\n", path);

    // in the case with no compression, just open the file, else open
    // a pipe to the compression executable.
    if (compress==COMPRESSION_NONE) {   
        if (!(f = fopen( path,"w"))) {
            log_messages.printf(SCHED_MSG_LOG::CRITICAL,"Can't open archive file %s %s\n",
                path, errno?strerror(errno):"");
            exit(3);
        }
    }
    else if (!(f = popen(command,"w"))) {
        log_messages.printf(SCHED_MSG_LOG::CRITICAL,"Can't open pipe %s %s\n", 
            command, errno?strerror(errno):"");
        exit(4);
    }

    // set buffering to line buffered, since we are outputing XML on a
    // line-by-line basis.
    //
    setlinebuf(f);

    return;
}

void close_archive(char *filename, FILE*& fp){
    char path[256];

    // Set file pointer to NULL after closing file to indicate that
    // it's closed.
    if (!fp)
        return;

    // In case of errors, carry on anyway.  This is deliberate, not lazy
    if (compress==COMPRESSION_NONE)
        fclose(fp);
    else
        pclose(fp);
    
    fp=NULL;

    // append appropriate file type
    sprintf(path, "../archives/%s_%d.xml", filename, time_int);
    strcat(path, suffix[compress]);
    
    log_messages.printf(SCHED_MSG_LOG::NORMAL,
        "Closed archive file %s containing records of %d workunits\n",
        path, wu_stored_in_file);

    return;
}

// opens the various archive files.  Guarantees that the timestamp
// does not equal the previous timestamp
//
void open_all_archives() {
    int old_time=time_int;
    
    // make sure we get a NEW value of the file timestamp!
    while (old_time == (time_int = (int)time(0)))
        sleep(1);
    
    // open all the archives.
    open_archive(WU_FILENAME_PREFIX,           wu_stream);
    open_archive(RESULT_FILENAME_PREFIX,       re_stream);
    open_archive(RESULT_INDEX_FILENAME_PREFIX, re_index_stream);
    open_archive(WU_INDEX_FILENAME_PREFIX,     wu_index_stream);

    return;
}

// closes (and optionally compresses) the archive files.  Clears file
// pointers to indicate that files are not open.
//
void close_all_archives() {
    close_archive(WU_FILENAME_PREFIX,           wu_stream);
    close_archive(RESULT_FILENAME_PREFIX,       re_stream);
    close_archive(RESULT_INDEX_FILENAME_PREFIX, re_index_stream);
    close_archive(WU_INDEX_FILENAME_PREFIX,     wu_index_stream);
    log_messages.printf(SCHED_MSG_LOG::NORMAL,
        "Closed archive files with %d workunits\n",
        wu_stored_in_file
    );

    return;
}


// The exit handler always calls this at the end to be sure that the
// database is closed cleanly.
void close_db_exit_handler() {
    boinc_db.close();
    return; 
}

int archive_result(DB_RESULT& result) {
    fprintf(re_stream,
        "<result_archive>\n"
        "    <id>%d</id>\n",
        result.id
    );

    string r1, r2;
    r1= result.stderr_out;
    xml_escape(r1, r2);

    fprintf(
        re_stream,
        "  <create_time>%d</create_time>\n"
        "  <workunitid>%d</workunitid>\n"
        "  <server_state>%d</server_state>\n"
        "  <outcome>%d</outcome>\n"
        "  <client_state>%d</client_state>\n"
        "  <hostid>%d</hostid>\n"
        "  <userid>%d</userid>\n"
        "  <report_deadline>%d</report_deadline>\n"
        "  <sent_time>%d</sent_time>\n"
        "  <received_time>%d</received_time>\n"
        "  <name>%s</name>\n"
        "  <cpu_time>%.15e</cpu_time>\n"
        "  <xml_doc_in>%s</xml_doc_in>\n"
        "  <xml_doc_out>%s</xml_doc_out>\n"
        "  <stderr_out>%s</stderr_out>\n"
        "  <batch>%d</batch>\n"
        "  <file_delete_state>%d</file_delete_state>\n"
        "  <validate_state>%d</validate_state>\n"
        "  <claimed_credit>%.15e</claimed_credit>\n"
        "  <granted_credit>%.15e</granted_credit>\n"
        "  <opaque>%f</opaque>\n"
        "  <random>%d</random>\n"
        "  <app_version_num>%d</app_version_num>\n"
        "  <appid>%d</appid>\n"
        "  <exit_status>%d</exit_status>\n"
        "  <teamid>%d</teamid>\n"
        "  <priority>%d</priority>\n"
        "  <mod_time>%s</mod_time>\n",
        result.create_time,
        result.workunitid,
        result.server_state,
        result.outcome,
        result.client_state,
        result.hostid,
        result.userid,
        result.report_deadline,
        result.sent_time,
        result.received_time,
        result.name,
        result.cpu_time,
        result.xml_doc_in,
        result.xml_doc_out,
        r2.c_str(),
        result.batch,
        result.file_delete_state,
        result.validate_state,
        result.claimed_credit,
        result.granted_credit,
        result.opaque,
        result.random,
        result.app_version_num,
        result.appid,
        result.exit_status,
        result.teamid,
        result.priority,
        result.mod_time
    );

    fprintf(re_stream,
        "</result_archive>\n"
    );

    fprintf(re_index_stream,
        "%d     %d\n",
        result.id, time_int
    );

    return 0;
}

int archive_wu(DB_WORKUNIT& wu) {
    fprintf(wu_stream,
        "<workunit_archive>\n"
        "    <id>%d</id>\n",
        wu.id
    );
    fprintf(wu_stream,
        "  <create_time>%d</create_time>\n"
        "  <appid>%d</appid>\n"
        "  <name>%s</name>\n"
        "  <xml_doc>%s</xml_doc>\n"
        "  <batch>%d</batch>\n"
        "  <rsc_fpops_est>%.15e</rsc_fpops_est>\n"
        "  <rsc_fpops_bound>%.15e</rsc_fpops_bound>\n"
        "  <rsc_memory_bound>%.15e</rsc_memory_bound>\n"
        "  <rsc_disk_bound>%.15e</rsc_disk_bound>\n"
        "  <need_validate>%d</need_validate>\n"
        "  <canonical_resultid>%d</canonical_resultid>\n"
        "  <canonical_credit>%.15e</canonical_credit>\n"
        "  <transition_time>%d</transition_time>\n"
        "  <delay_bound>%d</delay_bound>\n"
        "  <error_mask>%d</error_mask>\n"
        "  <file_delete_state>%d</file_delete_state>\n"
        "  <assimilate_state>%d</assimilate_state>\n"
        "  <hr_class>%d</hr_class>\n"
        "  <opaque>%f</opaque>\n"
        "  <min_quorum>%d</min_quorum>\n"
        "  <target_nresults>%d</target_nresults>\n"
        "  <max_error_results>%d</max_error_results>\n"
        "  <max_total_results>%d</max_total_results>\n"
        "  <max_success_results>%d</max_success_results>\n"
        "  <result_template_file>%s</result_template_file>\n"
        "  <priority>%d</priority>\n"
        "  <mod_time>%s</mod_time>\n",
        wu.create_time,
        wu.appid,
        wu.name,
        wu.xml_doc,
        wu.batch,
        wu.rsc_fpops_est,
        wu.rsc_fpops_bound,
        wu.rsc_memory_bound,
        wu.rsc_disk_bound,
        wu.need_validate,
        wu.canonical_resultid,
        wu.canonical_credit,
        wu.transition_time,
        wu.delay_bound,
        wu.error_mask,
        wu.file_delete_state,
        wu.assimilate_state,
        wu.hr_class,
        wu.opaque,
        wu.min_quorum,
        wu.target_nresults,
        wu.max_error_results,
        wu.max_total_results,
        wu.max_success_results,
        wu.result_template_file,
        wu.priority,
        wu.mod_time
    );

    fprintf(wu_stream,
        "</workunit_archive>\n"
    );

    fprintf(wu_index_stream,
        "%d     %d\n",
        wu.id, time_int
    );

    return 0;
}

int purge_and_archive_results(DB_WORKUNIT& wu, int& number_results) {
    int retval= 0;
    DB_RESULT result;
    char buf[256];

    number_results=0;

    sprintf(buf, "where workunitid=%d", wu.id);
    while (!result.enumerate(buf)) {
       retval= archive_result(result);
       if (retval) return retval;
       log_messages.printf(SCHED_MSG_LOG::DEBUG,"Archived result [%d] to a file\n", result.id);

       retval= result.delete_from_db();
       if (retval) return retval;
       log_messages.printf(SCHED_MSG_LOG::DEBUG,"Purged result [%d] from database\n", result.id);

       number_results++;
    }
    return 0;
}

// return nonzer if did anything
//
bool do_pass() {
    int retval= 0;

    // The number of workunits/results purged in a single pass of
    // do_pass().  Since do_pass() may be invoked multiple times,
    // corresponding global variables store global totals.
    //
    int do_pass_purged_workunits = 0;
    int do_pass_purged_results = 0;

    // check to see if we got a stop signal.  Note that if we do catch
    // a stop signal here, we call an exit handler that closes [and
    // optionally compresses] files before returning to the OS.
    //
    check_stop_daemons();

    bool did_something = false;
    DB_WORKUNIT wu;
    char buf[256];

    // select all workunits with file_delete_state='DONE'
    //
    sprintf(buf, "where file_delete_state=%d limit %d", FILE_DELETE_DONE,
            DB_QUERY_LIMIT);

    int n=0; // cleared in purge_and_archive_results, but avoid
             // compiler complaints about uninitialized
    while (!wu.enumerate(buf)) {
        did_something = true;
        
        // if archives have not already been opened, then open them.
        if (!wu_stream)
            open_all_archives();

        retval = purge_and_archive_results(wu, n);
        do_pass_purged_results += n;

        retval= archive_wu(wu);
        if (retval) {
            log_messages.printf(SCHED_MSG_LOG::CRITICAL,
                "Failed to write to XML file workunit:%d\n", wu.id
            );
            exit(5);
        }
        log_messages.printf(SCHED_MSG_LOG::DEBUG,"Archived workunit [%d] to a file\n", wu.id);

        //purge workunit from DB
        retval= wu.delete_from_db();
        if (retval) {
            log_messages.printf(SCHED_MSG_LOG::CRITICAL,"Can't delete workunit [%d] from database:%d\n", wu.id, retval);
            exit(6);
        }
        log_messages.printf(SCHED_MSG_LOG::DEBUG,"Purged workunit [%d] from database\n", wu.id);

        purged_workunits++;
        do_pass_purged_workunits++;
        wu_stored_in_file++;

        // flush the various output files.
        fflush(NULL);

        // if file has got max # of workunits, close and compress it.
        // This sets file pointers to NULL
        if (max_wu_per_file && wu_stored_in_file>=max_wu_per_file) {
            close_all_archives();
            wu_stored_in_file=0;
        }

        if (max_number_workunits_to_purge>=0 && purged_workunits >= max_number_workunits_to_purge)
            break;

    }

    log_messages.printf(SCHED_MSG_LOG::NORMAL,
        "Archived %d workunits and %d results\n",
        do_pass_purged_workunits,do_pass_purged_results
    );

    if (wu_stored_in_file>0) {
        log_messages.printf(SCHED_MSG_LOG::DEBUG,
            "Currently open archive files contain %d workunits\n",
            wu_stored_in_file);
    }

    return did_something;
}

int main(int argc, char** argv) {
    int retval;
    bool asynch = false, one_pass = false;
    int i;

    check_stop_daemons();
    for (i=1; i<argc; i++) {
        if (!strcmp(argv[i], "-asynch")) {
            asynch = true;
        } else if (!strcmp(argv[i], "-one_pass")) {
            one_pass = true;
        } else if (!strcmp(argv[i], "-d")) {
            log_messages.set_debug_level(atoi(argv[++i]));
        } else if (!strcmp(argv[i], "-max")) {
            // This is the limit on the maximum number of workunits to
            // purge.  Since all results associated with those WU are
            // also purged, it indirectly controls that number as
            // well.
            max_number_workunits_to_purge= atoi(argv[++i]);
        } else if (!strcmp(argv[i], "-zip")) {
            // compress output files using zip.  If used with
            // -max_wu_per_file then the files get compressed after
            // being closed.  In any case the files are compressed
            // when db_purge exits on a signal.
            compress=COMPRESSION_ZIP;
            // compress output files using gzip.  If used with
            // -max_wu_per_file then the files get compressed after
            // being closed.  In any case the files are compressed
            // when db_purge exits on a signal.
        } else if (!strcmp(argv[i], "-gzip")) {
            compress=COMPRESSION_GZIP;
        } else if (!strcmp(argv[i], "-max_wu_per_file")) {
            // This is the limit on the maximum number of workunits to
            // purge into a given file. The file is then closed and
            // another file is opened. This can be used to get a
            // series of bite-sized files instead of one huge file.
            max_wu_per_file = atoi(argv[++i]);
        } else {
            log_messages.printf(SCHED_MSG_LOG::CRITICAL,
                "Unrecognized arg: %s\n",
                argv[i]
            );
        }
    }

    retval = config.parse_file("..");
    if (retval) {
        log_messages.printf(SCHED_MSG_LOG::CRITICAL,
            "Can't parse config file\n"
        );
        exit(1);
    }

    if (asynch) {
        if (fork()) {
            exit(0);
        }
    }

    log_messages.printf(SCHED_MSG_LOG::NORMAL, "Starting\n");

    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 DB\n");
        exit(2);
    }
    install_stop_signal_handler();


    //time_t  now;
    //struct tm tim;
    //size_t i;

    //now= time(0);
    //tim= *(localtime(&now));
    //i= strftime(time_int,30,"%b%d_%Y_%H:%M:%S", &tim);
    mkdir("../archives", 0777);

    // on exit, either via the check_stop_daemons signal handler, or
    // through a regular call to exit, these functions will be called
    // in the opposite order of registration.
    atexit(close_db_exit_handler);
    atexit(close_all_archives);

    if (one_pass) {
        do_pass();
    } else {
        while (1) {
            if (max_number_workunits_to_purge>=0 && purged_workunits >= max_number_workunits_to_purge)
                break;
            if (!do_pass())
                sleep(10);
        }
    }    

    // files and database are closed by exit handler
    exit(0);
}

#ifdef __GNUC__
static volatile const char  __attribute__((unused)) *BOINCrcsid="$Id$";
#else
static volatile const char *BOINCrcsid="$Id$";
#endif