File: info.c

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/*
 *  Copyright (C) 2004-2009 Christos Tsantilas
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA  02110-1301  USA.
 */

#include "common.h"
#include "c-icap.h"
#include "service.h"
#include "header.h"
#include "body.h"
#include "simple_api.h"
#include "stats.h"
#include "proc_threads_queues.h"
#include "debug.h"

int info_init_service(ci_service_xdata_t * srv_xdata,
                      struct ci_server_conf *server_conf);
int info_check_preview_handler(char *preview_data, int preview_data_len,
                               ci_request_t *);
int info_end_of_data_handler(ci_request_t * req);
void *info_init_request_data(ci_request_t * req);
void info_close_service();
void info_release_request_data(void *data);
int info_io(char *wbuf, int *wlen, char *rbuf, int *rlen, int iseof,
            ci_request_t * req);

CI_DECLARE_MOD_DATA ci_service_module_t info_service = {
    "info",                         /* mod_name, The module name */
    "C-icap run-time information",            /* mod_short_descr,  Module short description */
    ICAP_REQMOD,                    /* mod_type, The service type is request modification */
    info_init_service,              /* mod_init_service. Service initialization */
    NULL,                           /* post_init_service. Service initialization after c-icap
                    configured. Not used here */
    info_close_service,           /* mod_close_service. Called when service shutdowns. */
    info_init_request_data,         /* mod_init_request_data */
    info_release_request_data,      /* mod_release_request_data */
    info_check_preview_handler,     /* mod_check_preview_handler */
    info_end_of_data_handler,       /* mod_end_of_data_handler */
    info_io,                        /* mod_service_io */
    NULL,
    NULL
};

struct info_req_data {
    ci_membuf_t *body;
    int txt_mode;
    int childs;
    int *child_pids;
    int free_servers;
    int used_servers;
    unsigned int closing_childs;
    int *closing_child_pids;
    unsigned int started_childs;
    unsigned int closed_childs;
    unsigned int crashed_childs;
    struct stat_memblock *collect_stats;
};

extern struct childs_queue *childs_queue;
extern ci_proc_mutex_t accept_mutex;

int build_statistics(struct info_req_data *info_data);

int info_init_service(ci_service_xdata_t * srv_xdata,
                      struct ci_server_conf *server_conf)
{
    ci_service_set_xopts(srv_xdata,  CI_XAUTHENTICATEDUSER|CI_XAUTHENTICATEDGROUPS);
    return CI_OK;
}

void info_close_service()
{
    ci_debug_printf(5,"Service %s shutdown!\n", info_service.mod_name);
}

void *info_init_request_data(ci_request_t * req)
{
    struct info_req_data *info_data;

    info_data = malloc(sizeof(struct info_req_data));

    info_data->body = ci_membuf_new();
    info_data->childs = 0;
    info_data->child_pids = malloc(childs_queue->size * sizeof(int));
    info_data->free_servers = 0;
    info_data->used_servers = 0;
    info_data->closing_childs = 0;
    info_data->closing_child_pids = malloc(childs_queue->size * sizeof(int));
    info_data->started_childs = 0;
    info_data->closed_childs = 0;
    info_data->crashed_childs = 0;
    info_data->txt_mode = 0;
    if (req->args[0] != '\0') {
        if (strstr(req->args, "view=text"))
            info_data->txt_mode = 1;
    }

    info_data->collect_stats = malloc(ci_stat_memblock_size());
    info_data->collect_stats->sig = 0xFAFA;
    stat_memblock_fix(info_data->collect_stats);
    ci_stat_memblock_reset(info_data->collect_stats);

    return info_data;
}

void info_release_request_data(void *data)
{
    struct info_req_data *info_data = (struct info_req_data *)data;

    if (info_data->body)
        ci_membuf_free(info_data->body);

    if (info_data->collect_stats)
        free(info_data->collect_stats);

    free(info_data);
}


int info_check_preview_handler(char *preview_data, int preview_data_len,
                               ci_request_t * req)
{
    struct info_req_data *info_data = ci_service_data(req);

    if (ci_req_hasbody(req))
        return CI_MOD_ALLOW204;

    ci_req_unlock_data(req);

    ci_http_response_create(req, 1, 1); /*Build the responce headers */

    ci_http_response_add_header(req, "HTTP/1.0 200 OK");
    ci_http_response_add_header(req, "Server: C-ICAP");
    ci_http_response_add_header(req, "Content-Type: text/html");
    ci_http_response_add_header(req, "Content-Language: en");
    ci_http_response_add_header(req, "Connection: close");
    if (info_data->body) {
        build_statistics (info_data);
    }

    return CI_MOD_CONTINUE;
}

int info_end_of_data_handler(ci_request_t * req)
{
    return CI_MOD_DONE;
}

int info_io(char *wbuf, int *wlen, char *rbuf, int *rlen, int iseof,
            ci_request_t * req)
{
    int ret;
    struct info_req_data *info_data = ci_service_data(req);
    ret = CI_OK;

    if (wbuf && wlen) {
        if (info_data->body)
            *wlen = ci_membuf_read(info_data->body, wbuf, *wlen);
        else
            *wlen = CI_EOF;
    }

    return ret;
}

/*Statistisc implementation .....*/

void fill_queue_statistics(struct childs_queue *q, struct info_req_data *info_data)
{

    int i;
    int requests = 0;
    struct stat_memblock *stats, copy_stats;
    struct server_statistics *srv_stats;
    if (!q->childs)
        return;

    /*Merge childs data*/
    for (i = 0; i < q->size; i++) {
        if (q->childs[i].pid != 0 && q->childs[i].to_be_killed == 0) {
            if (info_data->child_pids)
                info_data->child_pids[info_data->childs] = q->childs[i].pid;
            info_data->childs++;
            info_data->free_servers += q->childs[i].freeservers;
            info_data->used_servers += q->childs[i].usedservers;
            requests += q->childs[i].requests;

            stats = q->stats_area + i * (q->stats_block_size);
            copy_stats.counters64_size = stats->counters64_size;
            copy_stats.counterskbs_size = stats->counterskbs_size;
            copy_stats.counters64 = (void *)stats + _CI_ALIGN(sizeof(struct stat_memblock));
            copy_stats.counterskbs = (void *)stats + _CI_ALIGN(sizeof(struct stat_memblock))
                                     + stats->counters64_size*sizeof(uint64_t);

            ci_stat_memblock_merge(info_data->collect_stats, &copy_stats);
        } else if (q->childs[i].pid != 0 && q->childs[i].to_be_killed) {
            if (info_data->closing_child_pids)
                info_data->closing_child_pids[info_data->closing_childs] = q->childs[i].pid;
            info_data->closing_childs++;
        }
    }
    /*Merge history data*/
    stats = q->stats_area + q->size * q->stats_block_size;
    copy_stats.counters64_size = stats->counters64_size;
    copy_stats.counterskbs_size = stats->counterskbs_size;
    copy_stats.counters64 = (void *)stats + _CI_ALIGN(sizeof(struct stat_memblock));
    copy_stats.counterskbs = (void *)stats + _CI_ALIGN(sizeof(struct stat_memblock))
                             + stats->counters64_size*sizeof(uint64_t);

    ci_stat_memblock_merge(info_data->collect_stats, &copy_stats);

    srv_stats =
        (struct server_statistics *)(q->stats_area + q->size * q->stats_block_size + q->stats_block_size);
    /*Compute server statistics*/
    info_data->started_childs = srv_stats->started_childs;
    info_data->closed_childs = srv_stats->closed_childs;
    info_data->crashed_childs = srv_stats->crashed_childs;
}

struct stats_tmpl {
    char *gen_template;
    char *statsHeader;
    char *statsEnd;
    char *childsHeader;
    char *childs_tmpl;
    char *childsEnd;
    char *closingChildsHeader;
    char *d1TableHeader_tmpl;
    char *d1TableEntry_tmpl;
    char *d1TableEnd_tmpl;
    char *statline_tmpl_int;
    char *statline_tmpl_kbs;
};

struct stats_tmpl txt_tmpl = {
    "Running Servers Statistics\n===========================\n"\
    "Children number: %d\nFree Servers: %d\nUsed Servers: %d\n"\
    "Started Processes: %u\nClosed Processes: %u\nCrashed Processes: %u\n"\
    "Closing Processes: %u"\
    "\n\n",
    "\n%s Statistics\n==================\n",
    "",
    "Child pids:",
    " %d",
    "\n",
    "Closing children pids:",
    "%s\n",
    "\t %s\n",
    "\n\n",
    "%s : %lld\n",
    "%s : %lld Kbs %d bytes\n"
};

struct stats_tmpl html_tmpl = {
    "<H1>Running Servers Statistics</H1>\n"\
    "<TABLE>"                                     \
    "<TR><TH>Children number:</TH><TD> %d<TD>"                     \
    "<TR><TH>Free Servers:</TH><TD> %d<TD>"                      \
    "<TR><TH>Used Servers:</TH><TD> %d<TD>"                      \
    "<TR><TH>Started Processes :</TH><TD> %u<TD>"                \
    "<TR><TH>Closed Processes: </TH><TD>%u<TD>"                  \
    "<TR><TH>Crashed Processes: </TH><TD>%u<TD>"                 \
    "<TR><TH>Closing Processes: </TH><TD>%u<TD>"                 \
    "</TABLE>\n",
    "<H1>%s Statistics</H1>\n<TABLE>",
    "</TABLE>",
    "<TABLE> <TR><TH>Child pids:</TH>",
    "<TD> %d</TD>",
    "</TR></TABLE>\n",
    "<TABLE> <TR><TH>Closing children pids:</TH>",
    "<TABLE> <TR><TH>%s</TH></TR>\n",
    "<TR><TD>%s</TD></TR>\n",
    "</TABLE>\n",
    "<TR><TH>%s:</TH><TD>  %lld</TD>\n",
    "<TR><TH>%s:</TH><TD>  %lld Kbs %d bytes</TD>\n"
};

#define LOCAL_BUF_SIZE 1024
int build_statistics(struct info_req_data *info_data)
{
    char buf[LOCAL_BUF_SIZE];
    char buf2[LOCAL_BUF_SIZE];
    int sz, gid, k;
    char *stat_group;
    struct stats_tmpl *tmpl;

    if (info_data->txt_mode)
        tmpl = &txt_tmpl;
    else
        tmpl = &html_tmpl;

    if (!info_data->body)
        return 0;

    fill_queue_statistics(childs_queue, info_data);

    sz = snprintf(buf, LOCAL_BUF_SIZE,tmpl->gen_template,
                  info_data->childs,
                  info_data->free_servers,
                  info_data->used_servers,
                  info_data->started_childs,
                  info_data->closed_childs,
                  info_data->crashed_childs,
                  info_data->closing_childs
                 );

    if (sz > LOCAL_BUF_SIZE)
        sz = LOCAL_BUF_SIZE;

    ci_membuf_write(info_data->body,buf, sz, 0);

    /*print childs pids ...*/
    ci_membuf_write(info_data->body, tmpl->childsHeader, strlen(tmpl->childsHeader), 0);
    for (k = 0; k < info_data->childs; k++) {
        sz = snprintf(buf, LOCAL_BUF_SIZE, tmpl->childs_tmpl, info_data->child_pids[k]);
        if (sz > LOCAL_BUF_SIZE)
            sz = LOCAL_BUF_SIZE;
        ci_membuf_write(info_data->body,buf, sz, 0);
    }
    ci_membuf_write(info_data->body, tmpl->childsEnd, strlen(tmpl->childsEnd), 0);

    /*print closing childs pids ...*/
    ci_membuf_write(info_data->body, tmpl->closingChildsHeader, strlen(tmpl->closingChildsHeader), 0);
    for (k = 0; k < info_data->closing_childs; k++) {
        sz = snprintf(buf, LOCAL_BUF_SIZE, tmpl->childs_tmpl, info_data->closing_child_pids[k]);
        if (sz > LOCAL_BUF_SIZE)
            sz = LOCAL_BUF_SIZE;
        ci_membuf_write(info_data->body,buf, sz, 0);
    }
    ci_membuf_write(info_data->body, tmpl->childsEnd, strlen(tmpl->childsEnd), 0);

    /*Print semaphores*/
    sz = snprintf(buf, LOCAL_BUF_SIZE, tmpl->d1TableHeader_tmpl, "Semaphores in use");
    if (sz > LOCAL_BUF_SIZE)
        sz = LOCAL_BUF_SIZE;
    ci_membuf_write(info_data->body,buf, sz, 0);

    accept_mutex.scheme->proc_mutex_print_info(&accept_mutex, buf2, LOCAL_BUF_SIZE);
    sz = snprintf(buf, LOCAL_BUF_SIZE, tmpl->d1TableEntry_tmpl, buf2);
    ci_membuf_write(info_data->body,buf, sz, 0);

    childs_queue->queue_mtx.scheme->proc_mutex_print_info(&childs_queue->queue_mtx, buf2, LOCAL_BUF_SIZE);
    sz = snprintf(buf, LOCAL_BUF_SIZE, tmpl->d1TableEntry_tmpl, buf2);
    ci_membuf_write(info_data->body,buf, sz, 0);

    ci_membuf_write(info_data->body, tmpl->d1TableEnd_tmpl, strlen(tmpl->d1TableEnd_tmpl), 0);

    /*Print shared mem*/
    sz = snprintf(buf, LOCAL_BUF_SIZE, tmpl->d1TableHeader_tmpl, "Shared mem blocks in use");
    if (sz > LOCAL_BUF_SIZE)
        sz = LOCAL_BUF_SIZE;
    ci_membuf_write(info_data->body,buf, sz, 0);

    if (childs_queue->shmid.scheme) {

        childs_queue->shmid.scheme->shared_mem_print_info(&childs_queue->shmid, buf2, LOCAL_BUF_SIZE);
        sz = snprintf(buf, LOCAL_BUF_SIZE, tmpl->d1TableEntry_tmpl, buf2);
        ci_membuf_write(info_data->body,buf, sz, 0);
    }
    ci_membuf_write(info_data->body, tmpl->d1TableEnd_tmpl, strlen(tmpl->d1TableEnd_tmpl), 0);


    for (gid = 0; gid < STAT_GROUPS.entries_num; gid++) {
        stat_group = STAT_GROUPS.groups[gid];

        sz = snprintf(buf, LOCAL_BUF_SIZE, tmpl->statsHeader, stat_group);
        if (sz > LOCAL_BUF_SIZE)
            sz = LOCAL_BUF_SIZE;
        ci_membuf_write(info_data->body, buf, sz, 0);
        for (k = 0; k < info_data->collect_stats->counters64_size && k < STAT_INT64.entries_num; k++) {
            if (gid == STAT_INT64.entries[k].gid) {
                sz = snprintf(buf, LOCAL_BUF_SIZE, tmpl->statline_tmpl_int,
                              STAT_INT64.entries[k].label,
                              info_data->collect_stats->counters64[k]);
                if (sz > LOCAL_BUF_SIZE)
                    sz = LOCAL_BUF_SIZE;
                ci_membuf_write(info_data->body,buf, sz, 0);
            }
        }

        for (k = 0; k < info_data->collect_stats->counterskbs_size && k < STAT_KBS.entries_num; k++) {
            if (gid == STAT_KBS.entries[k].gid) {
                sz = snprintf(buf, LOCAL_BUF_SIZE, tmpl->statline_tmpl_kbs,
                              STAT_KBS.entries[k].label,
                              info_data->collect_stats->counterskbs[k]);
                if (sz > LOCAL_BUF_SIZE)
                    sz = LOCAL_BUF_SIZE;
                ci_membuf_write(info_data->body,buf, sz, 0);
            }
        }
        ci_membuf_write(info_data->body,tmpl->statsEnd, strlen(tmpl->statsEnd), 0);
    }
    ci_membuf_write(info_data->body, NULL, 0, 1);

    return 1;
}