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/* omhiredis.c
* Copyright 2012 Talksum, Inc
*
* 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 3 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 program. If not, see
* <http://www.gnu.org/licenses/>.
*
* Author: Brian Knox
* <briank@talksum.com>
*/
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <assert.h>
#include <signal.h>
#include <time.h>
#include <hiredis/hiredis.h>
#include "rsyslog.h"
#include "conf.h"
#include "syslogd-types.h"
#include "srUtils.h"
#include "template.h"
#include "module-template.h"
#include "errmsg.h"
#include "cfsysline.h"
MODULE_TYPE_OUTPUT
MODULE_TYPE_NOKEEP
MODULE_CNFNAME("omhiredis")
/* internal structures
*/
DEF_OMOD_STATIC_DATA
DEFobjCurrIf(errmsg)
typedef struct _instanceData {
redisContext *conn;
uchar *server;
int port;
unsigned uLastHiredisErrno;
uchar *tplName;
} instanceData;
static struct cnfparamdescr actpdescr[] = {
{ "server", eCmdHdlrGetWord, 0 },
{ "serverport", eCmdHdlrInt, 0 },
{ "template", eCmdHdlrGetWord, 1 }
};
static struct cnfparamblk actpblk =
{ CNFPARAMBLK_VERSION,
sizeof(actpdescr)/sizeof(struct cnfparamdescr),
actpdescr
};
BEGINcreateInstance
CODESTARTcreateInstance
ENDcreateInstance
BEGINisCompatibleWithFeature
CODESTARTisCompatibleWithFeature
if(eFeat == sFEATURERepeatedMsgReduction)
iRet = RS_RET_OK;
ENDisCompatibleWithFeature
static void closeHiredis(instanceData *pData)
{
if(pData->conn != NULL) {
redisFree(pData->conn);
pData->conn = NULL;
}
}
BEGINfreeInstance
CODESTARTfreeInstance
closeHiredis(pData);
free(pData->server);
free(pData->port);
free(pData->tplName);
ENDfreeInstance
BEGINdbgPrintInstInfo
CODESTARTdbgPrintInstInfo
/* nothing special here */
ENDdbgPrintInstInfo
static rsRetVal initHiredis(instanceData *pData, int bSilent)
{
char *server;
DEFiRet;
server = (pData->server == NULL) ? "127.0.0.1" : (char*) pData->server;
DBGPRINTF("omhiredis: trying connect to '%s' at port %d\n", server, pData->port);
struct timeval timeout = { 1, 500000 }; // 1.5 seconds
pData->conn = redisConnectWithTimeout(server, pData->port, timeout);
if (pData->conn->err) {
if(!bSilent)
errmsg.LogError(0, RS_RET_SUSPENDED,
"can not initialize redis handle");
ABORT_FINALIZE(RS_RET_SUSPENDED);
}
finalize_it:
RETiRet;
}
rsRetVal writeHiredis(uchar *message, instanceData *pData)
{
redisReply *reply;
DEFiRet;
if(pData->conn == NULL) {
CHKiRet(initHiredis(pData, 0));
}
reply = redisCommand(pData->conn, message);
if (!reply->integer) {
perror ("redisCommand()");
dbgprintf("omhiredis: redisCommand error\n");
freeReplyObject(reply);
ABORT_FINALIZE(RS_RET_ERR);
} else {
freeReplyObject(reply);
}
finalize_it:
if(iRet == RS_RET_OK) {
pData->uLastHiredisErrno = 0; /* reset error for error supression */
}
RETiRet;
}
BEGINtryResume
CODESTARTtryResume
if(pData->conn == NULL) {
iRet = initHiredis(pData, 1);
}
ENDtryResume
BEGINdoAction
CODESTARTdoAction
iRet = writeHiredis(ppString[0], pData);
ENDdoAction
static inline void
setInstParamDefaults(instanceData *pData)
{
pData->server = NULL;
pData->port = 6379;
pData->tplName = NULL;
}
BEGINnewActInst
struct cnfparamvals *pvals;
int i;
CODESTARTnewActInst
if((pvals = nvlstGetParams(lst, &actpblk, NULL)) == NULL) {
ABORT_FINALIZE(RS_RET_MISSING_CNFPARAMS);
}
CHKiRet(createInstance(&pData));
setInstParamDefaults(pData);
CODE_STD_STRING_REQUESTparseSelectorAct(1)
for(i = 0 ; i < actpblk.nParams ; ++i) {
if(!pvals[i].bUsed)
continue;
if(!strcmp(actpblk.descr[i].name, "server")) {
pData->server = (uchar*)es_str2cstr(pvals[i].val.d.estr, NULL);
} else if(!strcmp(actpblk.descr[i].name, "serverport")) {
pData->port = (int) pvals[i].val.d.n, NULL;
} else if(!strcmp(actpblk.descr[i].name, "template")) {
pData->tplName = (uchar*)es_str2cstr(pvals[i].val.d.estr, NULL);
} else {
dbgprintf("omhiredis: program error, non-handled "
"param '%s'\n", actpblk.descr[i].name);
}
}
if(pData->tplName == NULL) {
dbgprintf("omhiredis: action requires a template name");
ABORT_FINALIZE(RS_RET_MISSING_CNFPARAMS);
}
// template string 0 is just a regular string
OMSRsetEntry(*ppOMSR, 0,(uchar*)pData->tplName, OMSR_NO_RQD_TPL_OPTS);
CODE_STD_FINALIZERnewActInst
cnfparamvalsDestruct(pvals, &actpblk);
ENDnewActInst
BEGINparseSelectorAct
CODESTARTparseSelectorAct
// tell the engine we only want one template string
CODE_STD_STRING_REQUESTparseSelectorAct(1)
if(!strncmp((char*) p, ":omhiredis:", sizeof(":omhiredis:") - 1)) {
errmsg.LogError(0, RS_RET_LEGA_ACT_NOT_SUPPORTED,
"omhiredis supports only v6 config format, use: "
"action(type=\"omhiredis\" server=...)");
}
ABORT_FINALIZE(RS_RET_CONFLINE_UNPROCESSED);
CODE_STD_FINALIZERparseSelectorAct
ENDparseSelectorAct
BEGINmodExit
CODESTARTmodExit
ENDmodExit
BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_OMOD_QUERIES
CODEqueryEtryPt_STD_CONF2_OMOD_QUERIES
ENDqueryEtryPt
BEGINmodInit()
CODESTARTmodInit
*ipIFVersProvided = CURR_MOD_IF_VERSION; /* only supports rsyslog 6 configs */
CODEmodInit_QueryRegCFSLineHdlr
CHKiRet(objUse(errmsg, CORE_COMPONENT));
INITChkCoreFeature(bCoreSupportsBatching, CORE_FEATURE_BATCHING);
DBGPRINTF("omhiredis: module compiled with rsyslog version %s.\n", VERSION);
ENDmodInit
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