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# This file is part of Mysqlstat -*- c -*-
# Copyright (C) 2014-2016 Sergey Poznyakoff
#
# Mysqlstat is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# Mysqlstat 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Mysqlstat.  If not, see <http://www.gnu.org/licenses/>.

@define ROCOM@
/* Local variables:
   buffer-read-only: t
   End:
   vi: set ro:
*/
@enddefine@
@startperl@
$vars{'mysqlstat_translate_table'} = {
	processTotalCount       => q{process_total_count()},
	processActiveCount      => q{process_active_count()},
	processSlaveCount       => q{process_slave_count()}
};

$vars{'mysqlstat_translate'} = sub {
    my ($name) = @_;
    my $r = $vars{'mysqlstat_translate_table'}->{$name};
    if (!defined($r)) {
	print STDERR "no translation for $name!\n";
	exit(1);
    }
    $vars{'mysqlstat_get'}  = $r;
    return 0;
};	
	
$vars{'modulename'} = $vars{'name'};
$vars{'modulename'} =~ s#.*/##;
$vars{'modulename'} =~ s/\.c$//;

0;
@endperl@
@open ${modulename}.h@
/* THIS FILE IS GENERATED AUTOMATICALLY.  PLEASE DO NOT EDIT. */

extern unsigned mysqlstat_cache_timeout;

@open ${name}@
/* THIS FILE IS GENERATED AUTOMATICALLY.  PLEASE DO NOT EDIT. */

#include "mysqlstat.h"
#include "mysqlstat_mib.h"

/* Variable handlers.

   An instance handler only hands us one request at a time, unwrapping
   any eventual GETNEXT requests.  
*/

@foreach $i scalar@
  @startperl@
    &{$vars{'mysqlstat_translate'}}($vars{'i'});
  @endperl@

static int
handle_$i(netsnmp_mib_handler *handler,
                          netsnmp_handler_registration *reginfo,
                          netsnmp_agent_request_info   *reqinfo,
                          netsnmp_request_info         *requests)
{
  @if $i.settable@
    int ret;
  @end@
  @if $i.type eq 'ASN_OCTET_STR'@
    @eval $mysqlstat_type = q{char const *};@
  @elsif $i.type eq 'ASN_COUNTER64'@
    @eval $mysqlstat_type = q{uint64_t};@
  @elsif $i.type eq 'ASN_COUNTER'@
    @eval $mysqlstat_type = q{uint32_t};@
  @elsif $i.type eq 'ASN_INTEGER'@
    @eval $mysqlstat_type = q{uint32_t};@
  @elsif $i.type eq 'ASN_TIMETICKS'@
    @eval $mysqlstat_type = q{uint32_t};@
  @end@
    $mysqlstat_type val = $mysqlstat_get;

    switch(reqinfo->mode) {
    case MODE_GET:
  @if $i.type eq 'ASN_COUNTER64'@
    {
        struct counter64 ctr;
	ctr.high = val >> 32;
	ctr.low = val & 0xffffffff;
	snmp_set_var_typed_value(requests->requestvb, $i.type,
				 &ctr,
				 sizeof(ctr));
    }				 
  @elsif $i.type eq 'ASN_OCTET_STR'@
    {
       snmp_set_var_typed_value(requests->requestvb, $i.type,
 	                         val, strlen(val));
    }				
  @elsif $i.type eq 'ASN_COUNTER'@
    {
	snmp_set_var_typed_value(requests->requestvb, $i.type,
				 &val,
				 sizeof(val));
    }
  @elsif $i.type eq 'ASN_INTEGER'@
    {
	snmp_set_var_typed_value(requests->requestvb, $i.type,
				 &val,
				 sizeof(val));
    }
  @elsif $i.type eq 'ASN_TIMETICKS'@
    {
	snmp_set_var_typed_value(requests->requestvb, $i.type,
				 &val,
				 sizeof(val));
    }
  @else@
    @printf "unrecognized type %s for %s" $i.type $i@
  @end@
        break;

  @if $i.settable@
    /*
     * SET REQUEST
     *
     * multiple states in the transaction.  See:
     * http://www.net-snmp.org/tutorial-5/toolkit/mib_module/set-actions.jpg
     */
    case MODE_SET_RESERVE1:
	/* or you could use netsnmp_check_vb_type_and_size instead */
	ret = netsnmp_check_vb_type(requests->requestvb, $i.type);
        if (ret != SNMP_ERR_NOERROR)
	    netsnmp_set_request_error(reqinfo, requests, ret);
	break;

    case MODE_SET_RESERVE2:
    @if $mysqlstat_set_reserve2 ne ''@
        if ($mysqlstat_set_reserve2 (reqinfo, requests, vd)) {
	    netsnmp_set_request_error(reqinfo, requests,
				      SNMP_ERR_RESOURCEUNAVAILABLE);
	}
    @end@
	break;

    case MODE_SET_FREE:
    @if $mysqlstat_set_free ne ''@
        # Free resources allocated in RESERVE1 and/or
	# RESERVE2.  Something failed somewhere, and the states
	# below won't be called.
        $mysqlstat_set_free(reqinfo, requests, vd);
    @end@
	break;

    case MODE_SET_ACTION:
    @if $mysqlstat_set_action ne ''@
        ret = $mysqlstat_set_action(reqinfo, requests, vd);
        if (ret != SNMP_ERR_NOERROR)
	    netsnmp_set_request_error(reqinfo, requests, ret);
    @end@
	break;

    case MODE_SET_COMMIT:
    @if $mysqlstat_set_commit ne ''@
	# delete temporary storage
        if ($mysqlstat_set_commit(reqinfo, requests, vd))
	    netsnmp_set_request_error(reqinfo, requests, SNMP_ERR_COMMITFAILED);
    @end@
	break;

    case MODE_SET_UNDO:
    @if $mysqlstat_set_undo ne ''@
	# UNDO and return to previous value for the object
        if ($mysqlstat_set_undo(reqinfo, requests, vd))
	    netsnmp_set_request_error(reqinfo, requests, SNMP_ERR_UNDOFAILED);
    @end@
	break;
  @end@

    default:
	/* we should never get here, so this is a really bad error */
	snmp_log(LOG_ERR, "unknown mode (%d) in handle_${i}\n", reqinfo->mode );
	return SNMP_ERR_GENERR;
    }
    
    return SNMP_ERR_NOERROR;
}
@end@

@foreach $i table@
  ## Determine the first/last column names
  @eval $first_column = "-"@
  @eval $last_column = "-"@
  @foreach $c column@
    @if $c.readable@
      @if "$first_column" eq "-"@
        @eval $first_column = $c@
      @end@
      @eval $last_column = $c@
    @end@
  @end@

@push@
@append ${modulename}.h@
/* column number definitions for table $i */
  @foreach $c column@
#define COLUMN_$c.uc		$c.subid
  @end@

struct ${i}_entry {
    /* Index values */
    @foreach $idx index@
     @if $idx.needlength@
      @startperl@
      &{$vars{'set_field_dim'}}($vars{'idx'});
      @endperl@
      @if $field_dim > 0@
    $idx.decl $idx[$field_dim];
      @else@
    $idx.decl *$idx;
      @end@
    size_t ${idx}_len;
     @else@
    $idx.decl $idx;
     @end@
    @end@

    /* Column values */
    @foreach $c nonindex@
     @if $c.readable@
      @if $c.needlength@
      @startperl@
      &{$vars{'set_field_dim'}}($vars{'c'});
      @endperl@
      @if $field_dim > 0@
    $c.decl ${c}[$field_dim];
      @else@
    $c.decl *$c;
      @end@
    size_t ${c}_len;
      @else@
    $c.decl $c;
      @end@
     @end@
    @end@
};

int ${i}_load(netsnmp_cache *cache, void *vmagic);
void ${i}_entry_free(void *data);
@pop@

static void
${i}_free(netsnmp_cache *cache, void *vmagic)
{
	netsnmp_tdata  *table = (netsnmp_tdata *) vmagic;
	netsnmp_tdata_row *row;

	while ((row = netsnmp_tdata_row_first(table))) {
		${i}_entry_free(row->data);
		SNMP_FREE(row->data);
		netsnmp_tdata_remove_and_delete_row(table, row);
	}
}

/** handles requests for the $i table */
static int
handle_table_${i}(
    netsnmp_mib_handler               *handler,
    netsnmp_handler_registration      *reginfo,
    netsnmp_agent_request_info        *reqinfo,
    netsnmp_request_info              *requests)
{
    netsnmp_request_info       *request;
    netsnmp_table_request_info *table_info;
    struct ${i}_entry          *table_entry;

    switch (reqinfo->mode) {
    case MODE_GET:
        for (request = requests; request; request = request->next) {
            table_entry = (struct ${i}_entry *)
                           netsnmp_tdata_extract_entry(request);
            table_info  =  netsnmp_extract_table_info(request);
    
            switch (table_info->colnum) {
            @foreach $c column@
              @if $c.readable@
            case COLUMN_$c.uc:
                if (!table_entry) {
                    netsnmp_set_request_error(reqinfo, request,
                                              SNMP_NOSUCHINSTANCE);
                    continue;
                }
                @if $c.needlength@
                snmp_set_var_typed_value(request->requestvb, $c.type,
                                         table_entry->$c,
                                         table_entry->${c}_len);
                @elsif $c.type eq 'ASN_COUNTER64'@@
	        snmp_set_var_typed_value(requests->requestvb, $c.type,
				         &table_entry->$c,
				         sizeof(table_entry->$c));
                @else@
                snmp_set_var_typed_integer(request->requestvb, $c.type,
                                           table_entry->$c);
                @end@
                break;
              @end@
            @end@
            default:
                netsnmp_set_request_error(reqinfo, request,
                                          SNMP_NOSUCHOBJECT);
                break;
            }
        }
        break;
    default:
	/* we should never get here, so this is a really bad error */
	snmp_log(LOG_ERR, "unknown mode (%d) in handle_table_${i}\n",
                 reqinfo->mode);
	return SNMP_ERR_GENERR;

    }
    return SNMP_ERR_NOERROR;
}

/** Initialize the $i table by defining its contents and how it's structured */
static void
initialize_table_$i(void)
{
    const oid ${i}_oid[] = {$i.commaoid};
    const size_t ${i}_oid_len   = OID_LENGTH(${i}_oid);
    netsnmp_handler_registration    *reg;
    netsnmp_tdata                   *table_data;
    netsnmp_table_registration_info *table_info;
    netsnmp_cache                   *cache;

    DEBUGMSGTL(("${modulename}", "initializing table $i\n"));

    reg = netsnmp_create_handler_registration("$i", handle_table_${i},
	                                      ${i}_oid, ${i}_oid_len,
                                              HANDLER_CAN_RONLY);

    table_data = netsnmp_tdata_create_table("$i", 0);
    if (!table_data) {
        snmp_log(LOG_ERR,"error creating tdata table for $i\n");
        return;
    }
    cache = netsnmp_cache_create(mysqlstat_cache_timeout,
                                  ${i}_load, ${i}_free,
                                  ${i}_oid, ${i}_oid_len);
    if (!cache) {
        snmp_log(LOG_ERR,"error creating cache for $i\n");
    } else
        cache->magic = (void *)table_data;
    table_info = SNMP_MALLOC_TYPEDEF(netsnmp_table_registration_info);
    if (!table_info) {
        snmp_log(LOG_ERR,"error creating table info for $i\n");
        return;
    }
    netsnmp_table_helper_add_indexes(table_info,
    @foreach $idx index@
                           $idx.type,  /* index: $idx */
    @end@
                           0);

    table_info->min_column = COLUMN_$first_column.uc;
    table_info->max_column = COLUMN_$last_column.uc;
    
    netsnmp_tdata_register(reg, table_data, table_info);
    if (cache) 
	netsnmp_inject_handler(reg, netsnmp_cache_handler_get(cache));
/*	
        netsnmp_inject_handler_before(reg, netsnmp_cache_handler_get(cache),
                                      TABLE_TDATA_NAME);
*/
}

@end@

/** Initializes the $name module */
void
init_$modulename(void)
{
  @foreach $i scalar@
    @startperl@
      &{$vars{'mysqlstat_translate'}}($vars{'i'});
    @endperl@
$mysqlstat_if
    const oid ${i}_oid[] = { $i.commaoid };
$mysqlstat_endif
  @end@

  DEBUGMSGTL(("$modulename", "Initializing\n"));
  
  @foreach $i scalar@
    @startperl@
      &{$vars{'mysqlstat_translate'}}($vars{'i'});
    @endperl@
    netsnmp_register_scalar(
        netsnmp_create_handler_registration("$i", handle_$i,
                               ${i}_oid, OID_LENGTH(${i}_oid),
    @if !$i.settable@
                               HANDLER_CAN_RONLY
    @end@
    @if $i.settable@
                               HANDLER_CAN_RWRITE
    @end@
        ));
  @end@

  @foreach $i table@
    initialize_table_$i();
  @end@
}

void
deinit_$modulename(void)
{
	/* Nothing */
}
@calldefine ROCOM@


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