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action.c
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/* action.c
*
* Implementation of the action object.
*
* File begun on 2007-08-06 by RGerhards (extracted from syslogd.c)
*
* Some notes on processing (this hopefully makes it easier to find
* the right code in question): For performance reasons, this module
* uses different methods of message submission based on the user-selected
* configuration. This code is similar, but can not be abstracted because
* of the performance-affecting differences in it. As such, it is often
* necessary to triple-check that everything works well in *all* modes.
* The different modes (and calling sequence) are:
*
* if set iExecEveryNthOccur > 1 || iSecsExecOnceInterval
* - doSubmitToActionQComplex
* handles mark message reduction, but in essence calls
* - actionWriteToAction
* - qqueueEnqObj
* (now queue engine processing)
* if(pThis->bWriteAllMarkMsgs == RSFALSE)
* - doSubmitToActionQNotAllMark
* - doSubmitToActionQ (and from here like in the else case below!)
* else
* - doSubmitToActionQ
* - qqueueEnqObj
* (now queue engine processing)
*
* Note that bWriteAllMakrMsgs on or off creates almost the same processing.
* The difference ist that if WriteAllMarkMsgs is not set, we need to
* preprocess the batch and drop mark messages which are not yet due for
* writing.
*
* After dequeue, processing is as follows:
* - processBatchMain
* - ...
*
* MORE ON PROCESSING, QUEUES and FILTERING
* All filtering needs to be done BEFORE messages are enqueued to an
* action. In previous code, part of the filtering was done at the
* "remote end" of the action queue, which lead to problems in
* non-direct mode (because then things run asynchronously). In order
* to solve this problem once and for all, I have changed the code so
* that all filtering is done before enq, and processing on the
* dequeue side of action processing now always executes whatever is
* enqueued. This is the only way to handle things consistently and
* (as much as possible) in a queue-type agnostic way. However, it is
* a rather radical change, which I unfortunately needed to make from
* stable version 5.8.1 to 5.8.2. If new problems pop up, you now know
* what may be their cause. In any case, the way it is done now is the
* only correct one.
* A problem is that, under fortunate conditions, we use the current
* batch for the output system as well. This is very good from a performance
* point of view, but makes the distinction between enq and deq side of
* the queue a bit hard. The current idea is that the filter condition
* alone is checked at the deq side of the queue (seems to be unavoidable
* to do it that way), but all other complex conditons (like failover
* handling) go into the computation of the filter condition. For
* non-direct queues, we still enqueue only what is acutally necessary.
* Note that in this case the rest of the code must ensure that the filter
* is set to "true". While this is not perfect and not as simple as
* we would like to see it, it looks like the best way to tackle that
* beast.
* rgerhards, 2011-06-15
*
* Copyright 2007-2015 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Rsyslog 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 of the License, or
* (at your option) any later version.
*
* Rsyslog 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 Rsyslog. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
#include "config.h"
#include "rsyslog.h"
#include <stdio.h>
#include <assert.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include <errno.h>
#include <json.h>
#include "dirty.h"
#include "template.h"
#include "action.h"
#include "modules.h"
#include "cfsysline.h"
#include "srUtils.h"
#include "errmsg.h"
#include "batch.h"
#include "wti.h"
#include "rsconf.h"
#include "datetime.h"
#include "unicode-helper.h"
#include "atomic.h"
#include "ruleset.h"
#include "parserif.h"
#include "statsobj.h"
#define NO_TIME_PROVIDED 0 /* indicate we do not provide any cached time */
/* forward definitions */
static rsRetVal processBatchMain(void *pVoid, batch_t *pBatch, wti_t * const pWti);
static rsRetVal doSubmitToActionQ(action_t * const pAction, wti_t * const pWti, msg_t*);
static rsRetVal doSubmitToActionQComplex(action_t * const pAction, wti_t * const pWti, msg_t*);
static rsRetVal doSubmitToActionQNotAllMark(action_t * const pAction, wti_t * const pWti, msg_t*);
/* object static data (once for all instances) */
DEFobjCurrIf(obj)
DEFobjCurrIf(datetime)
DEFobjCurrIf(module)
DEFobjCurrIf(errmsg)
DEFobjCurrIf(statsobj)
DEFobjCurrIf(ruleset)
typedef struct configSettings_s {
int bActExecWhenPrevSusp; /* execute action only when previous one was suspended? */
int bActionWriteAllMarkMsgs; /* should all mark messages be unconditionally written? */
int iActExecOnceInterval; /* execute action once every nn seconds */
int iActExecEveryNthOccur; /* execute action every n-th occurence (0,1=always) */
time_t iActExecEveryNthOccurTO; /* timeout for n-occurence setting (in seconds, 0=never) */
int glbliActionResumeInterval;
int glbliActionResumeRetryCount; /* how often should suspended actions be retried? */
int bActionRepMsgHasMsg; /* last messsage repeated... has msg fragment in it */
uchar *pszActionName; /* short name for the action */
/* action queue and its configuration parameters */
queueType_t ActionQueType; /* type of the main message queue above */
int iActionQueueSize; /* size of the main message queue above */
int iActionQueueDeqBatchSize; /* batch size for action queues */
int iActionQHighWtrMark; /* high water mark for disk-assisted queues */
int iActionQLowWtrMark; /* low water mark for disk-assisted queues */
int iActionQDiscardMark; /* begin to discard messages */
int iActionQDiscardSeverity; /* by default, discard nothing to prevent unintentional loss */
int iActionQueueNumWorkers; /* number of worker threads for the mm queue above */
uchar *pszActionQFName; /* prefix for the main message queue file */
int64 iActionQueMaxFileSize;
int iActionQPersistUpdCnt; /* persist queue info every n updates */
int bActionQSyncQeueFiles; /* sync queue files */
int iActionQtoQShutdown; /* queue shutdown */
int iActionQtoActShutdown; /* action shutdown (in phase 2) */
int iActionQtoEnq; /* timeout for queue enque */
int iActionQtoWrkShutdown; /* timeout for worker thread shutdown */
int iActionQWrkMinMsgs; /* minimum messages per worker needed to start a new one */
int bActionQSaveOnShutdown; /* save queue on shutdown (when DA enabled)? */
int64 iActionQueMaxDiskSpace; /* max disk space allocated 0 ==> unlimited */
int iActionQueueDeqSlowdown; /* dequeue slowdown (simple rate limiting) */
int iActionQueueDeqtWinFromHr; /* hour begin of time frame when queue is to be dequeued */
int iActionQueueDeqtWinToHr; /* hour begin of time frame when queue is to be dequeued */
} configSettings_t;
configSettings_t cs; /* our current config settings */
configSettings_t cs_save; /* our saved (scope!) config settings */
/* the counter below counts actions created. It is used to obtain unique IDs for the action. They
* should not be relied on for any long-term activity (e.g. disk queue names!), but they are nice
* to have during one instance of an rsyslogd run. For example, I use them to name actions when there
* is no better name available.
*/
int iActionNbr = 0;
int bActionReportSuspension = 1;
int bActionReportSuspensionCont = 0;
/* tables for interfacing with the v6 config system */
static struct cnfparamdescr cnfparamdescr[] = {
{ "name", eCmdHdlrGetWord, 0 }, /* legacy: actionname */
{ "type", eCmdHdlrString, CNFPARAM_REQUIRED }, /* legacy: actionname */
{ "action.writeallmarkmessages", eCmdHdlrBinary, 0 }, /* legacy: actionwriteallmarkmessages */
{ "action.execonlyeverynthtime", eCmdHdlrInt, 0 }, /* legacy: actionexeconlyeverynthtime */
{ "action.execonlyeverynthtimetimeout", eCmdHdlrInt, 0 }, /* legacy: actionexeconlyeverynthtimetimeout */
{ "action.execonlyonceeveryinterval", eCmdHdlrInt, 0 }, /* legacy: actionexeconlyonceeveryinterval */
{ "action.execonlywhenpreviousissuspended", eCmdHdlrBinary, 0 }, /* legacy: actionexeconlywhenpreviousissuspended */
{ "action.repeatedmsgcontainsoriginalmsg", eCmdHdlrBinary, 0 }, /* legacy: repeatedmsgcontainsoriginalmsg */
{ "action.resumeretrycount", eCmdHdlrInt, 0 }, /* legacy: actionresumeretrycount */
{ "action.reportsuspension", eCmdHdlrBinary, 0 },
{ "action.reportsuspensioncontinuation", eCmdHdlrBinary, 0 },
{ "action.resumeinterval", eCmdHdlrInt, 0 },
{ "action.copymsg", eCmdHdlrBinary, 0 }
};
static struct cnfparamblk pblk =
{ CNFPARAMBLK_VERSION,
sizeof(cnfparamdescr)/sizeof(struct cnfparamdescr),
cnfparamdescr
};
/* ------------------------------ methods ------------------------------ */
/* This function returns the "current" time for this action. Current time
* is not necessarily real-time. In order to enhance performance, current
* system time is obtained the first time an action needs to know the time
* and then kept cached inside the action structure. Later requests will
* always return that very same time. Wile not totally accurate, it is far
* accurate in most cases and considered "acurate enough" for all cases.
* When changing the threading model, please keep in mind that this
* logic needs to be changed should we once allow more than one parallel
* call into the same action (object). As this is currently not supported,
* we simply cache the time inside the action object itself, after it
* is under mutex protection.
* Side-note: the value -1 is used as tActNow, because it also is the
* error return value of time(). So we would do a retry with the next
* invocation if time() failed. Then, of course, we would probably already
* be in trouble, but for the sake of performance we accept this very,
* very slight risk.
* This logic has been added as part of an overall performance improvment
* effort inspired by David Lang. -- rgerhards, 2008-09-16
* Note: this function does not use the usual iRet call conventions
* because that would provide little to no benefit but complicate things
* a lot. So we simply return the system time.
*/
static inline time_t
getActNow(action_t * const pThis)
{
assert(pThis != NULL);
if(pThis->tActNow == -1) {
pThis->tActNow = datetime.GetTime(NULL); /* good time call - the only one done */
if(pThis->tLastExec > pThis->tActNow) {
/* if we are traveling back in time, reset tLastExec */
pThis->tLastExec = (time_t) 0;
}
}
return pThis->tActNow;
}
/* resets action queue parameters to their default values. This happens
* after each action has been created in order to prevent any wild defaults
* to be used. It is somewhat against the original spirit of the config file
* reader, but I think it is a good thing to do.
* rgerhards, 2008-01-29
*/
static rsRetVal
actionResetQueueParams(void)
{
DEFiRet;
cs.ActionQueType = QUEUETYPE_DIRECT; /* type of the main message queue above */
cs.iActionQueueSize = 1000; /* size of the main message queue above */
cs.iActionQueueDeqBatchSize = 16; /* default batch size */
cs.iActionQHighWtrMark = -1; /* high water mark for disk-assisted queues */
cs.iActionQLowWtrMark = -1; /* low water mark for disk-assisted queues */
cs.iActionQDiscardMark = 980; /* begin to discard messages */
cs.iActionQDiscardSeverity = 8; /* discard warning and above */
cs.iActionQueueNumWorkers = 1; /* number of worker threads for the mm queue above */
cs.iActionQueMaxFileSize = 1024*1024;
cs.iActionQPersistUpdCnt = 0; /* persist queue info every n updates */
cs.bActionQSyncQeueFiles = 0;
cs.iActionQtoQShutdown = 0; /* queue shutdown */
cs.iActionQtoActShutdown = 1000; /* action shutdown (in phase 2) */
cs.iActionQtoEnq = 50; /* timeout for queue enque */
cs.iActionQtoWrkShutdown = 60000; /* timeout for worker thread shutdown */
cs.iActionQWrkMinMsgs = -1; /* minimum messages per worker needed to start a new one */
cs.bActionQSaveOnShutdown = 1; /* save queue on shutdown (when DA enabled)? */
cs.iActionQueMaxDiskSpace = 0;
cs.iActionQueueDeqSlowdown = 0;
cs.iActionQueueDeqtWinFromHr = 0;
cs.iActionQueueDeqtWinToHr = 25; /* 25 disables time windowed dequeuing */
cs.glbliActionResumeRetryCount = 0; /* I guess it is smart to reset this one, too */
d_free(cs.pszActionQFName);
cs.pszActionQFName = NULL; /* prefix for the main message queue file */
RETiRet;
}
/* destructs an action descriptor object
* rgerhards, 2007-08-01
*/
rsRetVal actionDestruct(action_t * const pThis)
{
DEFiRet;
ASSERT(pThis != NULL);
if(!strcmp((char*)modGetName(pThis->pMod), "builtin:omdiscard")) {
/* discard actions will be optimized out */
FINALIZE;
}
if(pThis->pQueue != NULL) {
qqueueDestruct(&pThis->pQueue);
}
/* destroy stats object, if we have one (may not always be
* be the case, e.g. if turned off)
*/
if(pThis->statsobj != NULL)
statsobj.Destruct(&pThis->statsobj);
if(pThis->pModData != NULL)
pThis->pMod->freeInstance(pThis->pModData);
pthread_mutex_destroy(&pThis->mutAction);
d_free(pThis->pszName);
d_free(pThis->ppTpl);
d_free(pThis->peParamPassing);
d_free(pThis->wrkrDataTable);
finalize_it:
d_free(pThis);
RETiRet;
}
/* Disable action, this means it will never again be usable
* until rsyslog is reloaded. Use only as a last resort, but
* depends on output module.
* rgerhards, 2007-08-02
*/
static inline void
actionDisable(action_t *__restrict__ const pThis)
{
pThis->bDisabled = 1;
}
/* create a new action descriptor object
* rgerhards, 2007-08-01
* Note that it is vital to set proper initial values as the v6 config
* system depends on these!
*/
rsRetVal actionConstruct(action_t **ppThis)
{
DEFiRet;
action_t *pThis;
ASSERT(ppThis != NULL);
CHKmalloc(pThis = (action_t*) calloc(1, sizeof(action_t)));
pThis->iResumeInterval = 30;
pThis->iResumeRetryCount = 0;
pThis->pszName = NULL;
pThis->bWriteAllMarkMsgs = 1;
pThis->iExecEveryNthOccur = 0;
pThis->iExecEveryNthOccurTO = 0;
pThis->iSecsExecOnceInterval = 0;
pThis->bExecWhenPrevSusp = 0;
pThis->bRepMsgHasMsg = 0;
pThis->bDisabled = 0;
pThis->isTransactional = 0;
pThis->bReportSuspension = -1; /* indicate "not yet set" */
pThis->bReportSuspensionCont = -1; /* indicate "not yet set" */
pThis->bCopyMsg = 0;
pThis->tLastOccur = datetime.GetTime(NULL); /* done once per action on startup only */
pThis->iActionNbr = iActionNbr;
pthread_mutex_init(&pThis->mutAction, NULL);
INIT_ATOMIC_HELPER_MUT(pThis->mutCAS);
/* indicate we have a new action */
++iActionNbr;
finalize_it:
*ppThis = pThis;
RETiRet;
}
/* action construction finalizer
*/
rsRetVal
actionConstructFinalize(action_t *__restrict__ const pThis, struct nvlst *lst)
{
DEFiRet;
uchar pszAName[64]; /* friendly name of our action */
if(!strcmp((char*)modGetName(pThis->pMod), "builtin:omdiscard")) {
/* discard actions will be optimized out */
FINALIZE;
}
/* generate a friendly name for us action stats */
if(pThis->pszName == NULL) {
snprintf((char*) pszAName, sizeof(pszAName)/sizeof(uchar), "action %d", iActionNbr);
pThis->pszName = ustrdup(pszAName);
}
/* cache transactional attribute */
pThis->isTransactional = pThis->pMod->mod.om.supportsTX;
if(pThis->isTransactional) {
int i;
for(i = 0 ; i < pThis->iNumTpls ; ++i) {
if(pThis->peParamPassing[i] != ACT_STRING_PASSING) {
errmsg.LogError(0, RS_RET_INVLD_OMOD, "action '%s'(%d) is transactional but "
"parameter %d "
"uses invalid paramter passing mode -- disabling "
"action. This is probably caused by a pre-v7 "
"output module that needs upgrade.",
pThis->pszName, pThis->iActionNbr, i);
actionDisable(pThis);
ABORT_FINALIZE(RS_RET_INVLD_OMOD);
}
}
}
/* support statistics gathering */
CHKiRet(statsobj.Construct(&pThis->statsobj));
CHKiRet(statsobj.SetName(pThis->statsobj, pThis->pszName));
CHKiRet(statsobj.SetOrigin(pThis->statsobj, (uchar*)"core.action"));
STATSCOUNTER_INIT(pThis->ctrProcessed, pThis->mutCtrProcessed);
CHKiRet(statsobj.AddCounter(pThis->statsobj, UCHAR_CONSTANT("processed"),
ctrType_IntCtr, CTR_FLAG_RESETTABLE, &pThis->ctrProcessed));
STATSCOUNTER_INIT(pThis->ctrFail, pThis->mutCtrFail);
CHKiRet(statsobj.AddCounter(pThis->statsobj, UCHAR_CONSTANT("failed"),
ctrType_IntCtr, CTR_FLAG_RESETTABLE, &pThis->ctrFail));
STATSCOUNTER_INIT(pThis->ctrSuspend, pThis->mutCtrSuspend);
CHKiRet(statsobj.AddCounter(pThis->statsobj, UCHAR_CONSTANT("suspended"),
ctrType_IntCtr, CTR_FLAG_RESETTABLE, &pThis->ctrSuspend));
STATSCOUNTER_INIT(pThis->ctrSuspendDuration, pThis->mutCtrSuspendDuration);
CHKiRet(statsobj.AddCounter(pThis->statsobj, UCHAR_CONSTANT("suspended.duration"),
ctrType_IntCtr, 0, &pThis->ctrSuspendDuration));
STATSCOUNTER_INIT(pThis->ctrResume, pThis->mutCtrResume);
CHKiRet(statsobj.AddCounter(pThis->statsobj, UCHAR_CONSTANT("resumed"),
ctrType_IntCtr, CTR_FLAG_RESETTABLE, &pThis->ctrResume));
CHKiRet(statsobj.ConstructFinalize(pThis->statsobj));
/* create our queue */
/* generate a friendly name for the queue */
snprintf((char*) pszAName, sizeof(pszAName)/sizeof(uchar), "%s queue",
pThis->pszName);
/* now check if we can run the action in "firehose mode" during stage one of
* its processing (that is before messages are enqueued into the action q).
* This is only possible if some features, which require strict sequence, are
* not used. Thankfully, that is usually the case. The benefit of firehose
* mode is much faster processing (and simpler code) -- rgerhards, 2010-06-08
*/
if( pThis->iExecEveryNthOccur > 1
|| pThis->iSecsExecOnceInterval
) {
DBGPRINTF("info: firehose mode disabled for action because "
"iExecEveryNthOccur=%d, iSecsExecOnceInterval=%d\n",
pThis->iExecEveryNthOccur, pThis->iSecsExecOnceInterval);
pThis->submitToActQ = doSubmitToActionQComplex;
} else if(pThis->bWriteAllMarkMsgs) {
/* full firehose submission mode, default case*/
pThis->submitToActQ = doSubmitToActionQ;
} else {
/* nearly full-speed submission mode */
pThis->submitToActQ = doSubmitToActionQNotAllMark;
}
/* create queue */
/* action queues always (for now) have just one worker. This may change when
* we begin to implement an interface the enable output modules to request
* to be run on multiple threads. So far, this is forbidden by the interface
* spec. -- rgerhards, 2008-01-30
*/
CHKiRet(qqueueConstruct(&pThis->pQueue, cs.ActionQueType, 1, cs.iActionQueueSize,
processBatchMain));
obj.SetName((obj_t*) pThis->pQueue, pszAName);
qqueueSetpAction(pThis->pQueue, pThis);
if(lst == NULL) { /* use legacy params? */
/* ... set some properties ... */
# define setQPROP(func, directive, data) \
CHKiRet_Hdlr(func(pThis->pQueue, data)) { \
errmsg.LogError(0, NO_ERRCODE, "Invalid " #directive ", \
error %d. Ignored, running with default setting", iRet); \
}
# define setQPROPstr(func, directive, data) \
CHKiRet_Hdlr(func(pThis->pQueue, data, (data == NULL)? 0 : strlen((char*) data))) { \
errmsg.LogError(0, NO_ERRCODE, "Invalid " #directive ", \
error %d. Ignored, running with default setting", iRet); \
}
setQPROP(qqueueSetsizeOnDiskMax, "$ActionQueueMaxDiskSpace", cs.iActionQueMaxDiskSpace);
setQPROP(qqueueSetiDeqBatchSize, "$ActionQueueDequeueBatchSize", cs.iActionQueueDeqBatchSize);
setQPROP(qqueueSetMaxFileSize, "$ActionQueueFileSize", cs.iActionQueMaxFileSize);
setQPROPstr(qqueueSetFilePrefix, "$ActionQueueFileName", cs.pszActionQFName);
setQPROP(qqueueSetiPersistUpdCnt, "$ActionQueueCheckpointInterval", cs.iActionQPersistUpdCnt);
setQPROP(qqueueSetbSyncQueueFiles, "$ActionQueueSyncQueueFiles", cs.bActionQSyncQeueFiles);
setQPROP(qqueueSettoQShutdown, "$ActionQueueTimeoutShutdown", cs.iActionQtoQShutdown );
setQPROP(qqueueSettoActShutdown, "$ActionQueueTimeoutActionCompletion", cs.iActionQtoActShutdown);
setQPROP(qqueueSettoWrkShutdown, "$ActionQueueWorkerTimeoutThreadShutdown", cs.iActionQtoWrkShutdown);
setQPROP(qqueueSettoEnq, "$ActionQueueTimeoutEnqueue", cs.iActionQtoEnq);
setQPROP(qqueueSetiHighWtrMrk, "$ActionQueueHighWaterMark", cs.iActionQHighWtrMark);
setQPROP(qqueueSetiLowWtrMrk, "$ActionQueueLowWaterMark", cs.iActionQLowWtrMark);
setQPROP(qqueueSetiDiscardMrk, "$ActionQueueDiscardMark", cs.iActionQDiscardMark);
setQPROP(qqueueSetiDiscardSeverity, "$ActionQueueDiscardSeverity", cs.iActionQDiscardSeverity);
setQPROP(qqueueSetiMinMsgsPerWrkr, "$ActionQueueWorkerThreadMinimumMessages", cs.iActionQWrkMinMsgs);
setQPROP(qqueueSetiNumWorkerThreads, "$ActionQueueWorkerThreads", cs.iActionQueueNumWorkers);
setQPROP(qqueueSetbSaveOnShutdown, "$ActionQueueSaveOnShutdown", cs.bActionQSaveOnShutdown);
setQPROP(qqueueSetiDeqSlowdown, "$ActionQueueDequeueSlowdown", cs.iActionQueueDeqSlowdown);
setQPROP(qqueueSetiDeqtWinFromHr, "$ActionQueueDequeueTimeBegin", cs.iActionQueueDeqtWinFromHr);
setQPROP(qqueueSetiDeqtWinToHr, "$ActionQueueDequeueTimeEnd", cs.iActionQueueDeqtWinToHr);
} else {
/* we have v6-style config params */
qqueueSetDefaultsActionQueue(pThis->pQueue);
qqueueApplyCnfParam(pThis->pQueue, lst);
}
# undef setQPROP
# undef setQPROPstr
qqueueDbgPrint(pThis->pQueue);
DBGPRINTF("Action %p: queue %p created\n", pThis, pThis->pQueue);
if(pThis->bUsesMsgPassingMode && pThis->pQueue->qType != QUEUETYPE_DIRECT) {
parser_warnmsg("module %s with message passing mode uses "
"non-direct queue. This most probably leads to undesired "
"results", (char*)modGetName(pThis->pMod));
}
/* and now reset the queue params (see comment in its function header!) */
actionResetQueueParams();
finalize_it:
RETiRet;
}
/* set the global resume interval
*/
rsRetVal actionSetGlobalResumeInterval(int iNewVal)
{
cs.glbliActionResumeInterval = iNewVal;
return RS_RET_OK;
}
/* returns the action state name in human-readable form
* returned string must not be modified.
* rgerhards, 2009-05-07
*/
static uchar *getActStateName(action_t * const pThis, wti_t * const pWti)
{
switch(getActionState(pWti, pThis)) {
case ACT_STATE_RDY:
return (uchar*) "rdy";
case ACT_STATE_ITX:
return (uchar*) "itx";
case ACT_STATE_RTRY:
return (uchar*) "rtry";
case ACT_STATE_SUSP:
return (uchar*) "susp";
case ACT_STATE_COMM:
return (uchar*) "comm";
default:
return (uchar*) "ERROR/UNKNWON";
}
}
/* returns a suitable return code based on action state
* rgerhards, 2009-05-07
*/
static rsRetVal getReturnCode(action_t * const pThis, wti_t * const pWti)
{
DEFiRet;
ASSERT(pThis != NULL);
switch(getActionState(pWti, pThis)) {
case ACT_STATE_RDY:
iRet = RS_RET_OK;
break;
case ACT_STATE_ITX:
if(pThis->bHadAutoCommit) {
pThis->bHadAutoCommit = 0; /* auto-reset */
iRet = RS_RET_PREVIOUS_COMMITTED;
} else {
iRet = RS_RET_DEFER_COMMIT;
}
break;
case ACT_STATE_RTRY:
iRet = RS_RET_SUSPENDED;
break;
case ACT_STATE_SUSP:
iRet = RS_RET_ACTION_FAILED;
break;
default:
DBGPRINTF("Invalid action engine state %u, program error\n",
getActionState(pWti, pThis));
iRet = RS_RET_ERR;
break;
}
RETiRet;
}
/* set the action to a new state
* rgerhards, 2007-08-02
*/
static inline void
actionSetState(action_t * const pThis, wti_t * const pWti, uint8_t newState)
{
setActionState(pWti, pThis, newState);
DBGPRINTF("Action %d transitioned to state: %s\n",
pThis->iActionNbr, getActStateName(pThis, pWti));
}
/* Handles the transient commit state. So far, this is
* mostly a dummy...
* rgerhards, 2007-08-02
*/
static void actionCommitted(action_t * const pThis, wti_t * const pWti)
{
actionSetState(pThis, pWti, ACT_STATE_RDY);
}
/* set action to "rtry" state.
* rgerhards, 2007-08-02
*/
static void actionRetry(action_t * const pThis, wti_t * const pWti)
{
actionSetState(pThis, pWti, ACT_STATE_RTRY);
incActionResumeInRow(pWti, pThis);
}
/* Suspend action, this involves changing the action state as well
* as setting the next retry time.
* if we have more than 10 retries, we prolong the
* retry interval. If something is really stalled, it will
* get re-tried only very, very seldom - but that saves
* CPU time. TODO: maybe a config option for that?
* rgerhards, 2007-08-02
*/
static inline void
actionSuspend(action_t * const pThis, wti_t * const pWti)
{
time_t ttNow;
int suspendDuration;
char timebuf[32];
/* we need to defer setting the action's own bReportSuspension state until
* after the full config has been processed. So the most simple case to do
* that is here. It's not a performance problem, as it happens infrequently.
* it's not a threading race problem, as always the same value will be written.
*/
if(pThis->bReportSuspension == -1)
pThis->bReportSuspension = bActionReportSuspension;
if(pThis->bReportSuspensionCont == -1) {
pThis->bReportSuspensionCont = bActionReportSuspensionCont;
if(pThis->bReportSuspensionCont == -1)
pThis->bReportSuspension = 1;
}
/* note: we can NOT use a cached timestamp, as time may have evolved
* since caching, and this would break logic (and it actually did so!)
*/
datetime.GetTime(&ttNow);
suspendDuration = pThis->iResumeInterval * (getActionNbrResRtry(pWti, pThis) / 10 + 1);
pThis->ttResumeRtry = ttNow + suspendDuration;
actionSetState(pThis, pWti, ACT_STATE_SUSP);
pThis->ctrSuspendDuration += suspendDuration;
if(getActionNbrResRtry(pWti, pThis) == 0) {
STATSCOUNTER_INC(pThis->ctrSuspend, pThis->mutCtrSuspend);
}
if( pThis->bReportSuspensionCont
|| (pThis->bReportSuspension && getActionNbrResRtry(pWti, pThis) == 0) ) {
ctime_r(&pThis->ttResumeRtry, timebuf);
timebuf[strlen(timebuf)-1] = '\0'; /* strip LF */
errmsg.LogMsg(0, RS_RET_SUSPENDED, LOG_WARNING,
"action '%s' suspended, next retry is %s",
pThis->pszName, timebuf);
}
DBGPRINTF("action '%s' suspended, earliest retry=%lld (now %lld), iNbrResRtry %d, "
"duration %d\n",
pThis->pszName, (long long) pThis->ttResumeRtry, (long long) ttNow,
getActionNbrResRtry(pWti, pThis), suspendDuration);
}
/* actually do retry processing. Note that the function receives a timestamp so
* that we do not need to call the (expensive) time() API.
* Note that we do the full retry processing here, doing the configured number of
* iterations. -- rgerhards, 2009-05-07
* We need to guard against module which always return RS_RET_OK from their tryResume()
* entry point. This is invalid, but has harsh consequences: it will cause the rsyslog
* engine to go into a tight loop. That obviously is not acceptable. As such, we track the
* count of iterations that a tryResume returning RS_RET_OK is immediately followed by
* an unsuccessful call to doAction(). If that happens more than 10 times, we assume
* the return acutally is a RS_RET_SUSPENDED. In order to go through the various
* resumption stages, we do this for every 10 requests. This magic number 10 may
* not be the most appropriate, but it should be thought of a "if nothing else helps"
* kind of facility: in the first place, the module should return a proper indication
* of its inability to recover. -- rgerhards, 2010-04-26.
*/
static rsRetVal
actionDoRetry(action_t * const pThis, wti_t * const pWti)
{
int iRetries;
int iSleepPeriod;
int bTreatOKasSusp;
DEFiRet;
ASSERT(pThis != NULL);
iRetries = 0;
while((*pWti->pbShutdownImmediate == 0) && getActionState(pWti, pThis) == ACT_STATE_RTRY) {
DBGPRINTF("actionDoRetry: %s enter loop, iRetries=%d\n", pThis->pszName, iRetries);
iRet = pThis->pMod->tryResume(pWti->actWrkrInfo[pThis->iActionNbr].actWrkrData);
DBGPRINTF("actionDoRetry: %s action->tryResume returned %d\n", pThis->pszName, iRet);
if((getActionResumeInRow(pWti, pThis) > 9) && (getActionResumeInRow(pWti, pThis) % 10 == 0)) {
bTreatOKasSusp = 1;
setActionResumeInRow(pWti, pThis, 0);
} else {
bTreatOKasSusp = 0;
}
if((iRet == RS_RET_OK) && (!bTreatOKasSusp)) {
DBGPRINTF("actionDoRetry: %s had success RDY again (iRet=%d)\n",
pThis->pszName, iRet);
if(pThis->bReportSuspension) {
errmsg.LogMsg(0, RS_RET_RESUMED, LOG_INFO, "action '%s' "
"resumed (module '%s')",
pThis->pszName, pThis->pMod->pszName);
}
setActionJustResumed(pWti, pThis, 1);
actionSetState(pThis, pWti, ACT_STATE_RDY);
} else if(iRet == RS_RET_SUSPENDED || bTreatOKasSusp) {
/* max retries reached? */
DBGPRINTF("actionDoRetry: %s check for max retries, iResumeRetryCount "
"%d, iRetries %d\n",
pThis->pszName, pThis->iResumeRetryCount, iRetries);
if((pThis->iResumeRetryCount != -1 && iRetries >= pThis->iResumeRetryCount)) {
actionSuspend(pThis, pWti);
if(getActionNbrResRtry(pWti, pThis) < 20)
incActionNbrResRtry(pWti, pThis);
} else {
++iRetries;
iSleepPeriod = pThis->iResumeInterval;
srSleep(iSleepPeriod, 0);
if(*pWti->pbShutdownImmediate) {
ABORT_FINALIZE(RS_RET_FORCE_TERM);
}
}
} else if(iRet == RS_RET_DISABLE_ACTION) {
actionDisable(pThis);
}
}
if(getActionState(pWti, pThis) == ACT_STATE_RDY) {
setActionNbrResRtry(pWti, pThis, 0);
}
finalize_it:
RETiRet;
}
static rsRetVal
actionCheckAndCreateWrkrInstance(action_t * const pThis, wti_t * const pWti)
{
DEFiRet;
if(pWti->actWrkrInfo[pThis->iActionNbr].actWrkrData == NULL) {
DBGPRINTF("wti %p: we need to create a new action worker instance for "
"action %d\n", pWti, pThis->iActionNbr);
CHKiRet(pThis->pMod->mod.om.createWrkrInstance(&(pWti->actWrkrInfo[pThis->iActionNbr].actWrkrData),
pThis->pModData));
pWti->actWrkrInfo[pThis->iActionNbr].pAction = pThis;
setActionState(pWti, pThis, ACT_STATE_RDY); /* action is enabled */
/* maintain worker data table -- only needed if wrkrHUP is requested! */
int freeSpot;
for(freeSpot = 0 ; freeSpot < pThis->wrkrDataTableSize ; ++freeSpot)
if(pThis->wrkrDataTable[freeSpot] == NULL)
break;
if(pThis->nWrkr == pThis->wrkrDataTableSize) {
// TODO: check realloc, fall back to old table if it fails. Better than nothing...
pThis->wrkrDataTable = realloc(pThis->wrkrDataTable,
(pThis->wrkrDataTableSize + 1) * sizeof(void*));
pThis->wrkrDataTableSize++;
}
dbgprintf("DDDD: writing data to table spot %d\n", freeSpot);
pThis->wrkrDataTable[freeSpot] = pWti->actWrkrInfo[pThis->iActionNbr].actWrkrData;
pThis->nWrkr++;
DBGPRINTF("wti %p: created action worker instance %d for "
"action %d\n", pWti, pThis->nWrkr, pThis->iActionNbr);
}
finalize_it:
RETiRet;
}
/* try to resume an action -- rgerhards, 2007-08-02
* changed to new action state engine -- rgerhards, 2009-05-07
*/
static rsRetVal
actionTryResume(action_t * const pThis, wti_t * const pWti)
{
DEFiRet;
time_t ttNow = NO_TIME_PROVIDED;
if(getActionState(pWti, pThis) == ACT_STATE_SUSP) {
/* if we are suspended, we need to check if the timeout expired.
* for this handling, we must always obtain a fresh timestamp. We used
* to use the action timestamp, but in this case we will never reach a
* point where a resumption is actually tried, because the action timestamp
* is always in the past. So we can not avoid doing a fresh time() call
* here. -- rgerhards, 2009-03-18
*/
datetime.GetTime(&ttNow); /* cache "now" */
if(ttNow >= pThis->ttResumeRtry) {
actionSetState(pThis, pWti, ACT_STATE_RTRY); /* back to retries */
}
}
if(getActionState(pWti, pThis) == ACT_STATE_RTRY) {
if(ttNow == NO_TIME_PROVIDED) /* use cached result if we have it */
datetime.GetTime(&ttNow);
CHKiRet(actionDoRetry(pThis, pWti));
}
if(Debug && (getActionState(pWti, pThis) == ACT_STATE_RTRY ||getActionState(pWti, pThis) == ACT_STATE_SUSP)) {
DBGPRINTF("actionTryResume: action %p state: %s, next retry (if applicable): %u [now %u]\n",
pThis, getActStateName(pThis, pWti), (unsigned) pThis->ttResumeRtry, (unsigned) ttNow);
}
finalize_it:
RETiRet;
}
/* prepare an action for performing work. This involves trying to recover it,
* depending on its current state.
* rgerhards, 2009-05-07
*/
static inline rsRetVal
actionPrepare(action_t *__restrict__ const pThis, wti_t *__restrict__ const pWti)
{
DEFiRet;
CHKiRet(actionCheckAndCreateWrkrInstance(pThis, pWti));
CHKiRet(actionTryResume(pThis, pWti));
/* if we are now ready, we initialize the transaction and advance
* action state accordingly
*/
if(getActionState(pWti, pThis) == ACT_STATE_RDY) {
iRet = pThis->pMod->mod.om.beginTransaction(pWti->actWrkrInfo[pThis->iActionNbr].actWrkrData);
switch(iRet) {
case RS_RET_OK:
actionSetState(pThis, pWti, ACT_STATE_ITX);
break;
case RS_RET_SUSPENDED:
actionRetry(pThis, pWti);
break;
case RS_RET_DISABLE_ACTION:
actionDisable(pThis);
break;
default:FINALIZE;
}
}
finalize_it:
RETiRet;
}
#if 0 // TODO: remove?
/* debug-print the contents of an action object
* rgerhards, 2007-08-02
*/
static rsRetVal actionDbgPrint(action_t *pThis)
{
DEFiRet;
char *sz;
dbgprintf("%s: ", module.GetStateName(pThis->pMod));
pThis->pMod->dbgPrintInstInfo(pThis->pModData);
dbgprintf("\n");
dbgprintf("\tInstance data: 0x%lx\n", (unsigned long) pThis->pModData);
dbgprintf("\tResume Interval: %d\n", pThis->iResumeInterval);
#if 0 // do we need this ???
if(getActionState(pWti, pThis) == ACT_STATE_SUSP) {
dbgprintf("\tresume next retry: %u, number retries: %d",
(unsigned) pThis->ttResumeRtry, pThis->iNbrResRtry);
}
#endif
dbgprintf("\tExec only when previous is suspended: %d\n", pThis->bExecWhenPrevSusp);
if(pThis->submitToActQ == doSubmitToActionQComplexBatch) {
sz = "slow, but feature-rich";
} else if(pThis->submitToActQ == doSubmitToActionQNotAllMarkBatch) {
sz = "fast, but supports partial mark messages";
} else if(pThis->submitToActQ == doSubmitToActionQBatch) {
sz = "firehose (fastest)";
} else {
sz = "unknown (need to update debug display?)";
}
dbgprintf("\tsubmission mode: %s\n", sz);
dbgprintf("\n");
RETiRet;
}
#endif
/* prepare the calling parameters for doAction()
* rgerhards, 2009-05-07
*/
static rsRetVal
prepareDoActionParams(action_t * __restrict__ const pAction,
wti_t * __restrict__ const pWti,
msg_t *__restrict__ const pMsg,
struct syslogTime *ttNow)
{
int i;
struct json_object *json;
actWrkrIParams_t *iparams;
actWrkrInfo_t *__restrict__ pWrkrInfo;
DEFiRet;
pWrkrInfo = &(pWti->actWrkrInfo[pAction->iActionNbr]);
if(pAction->isTransactional) {
CHKiRet(wtiNewIParam(pWti, pAction, &iparams));
for(i = 0 ; i < pAction->iNumTpls ; ++i) {
CHKiRet(tplToString(pAction->ppTpl[i], pMsg,
&actParam(iparams, pAction->iNumTpls, 0, i),
ttNow));
}
} else {
for(i = 0 ; i < pAction->iNumTpls ; ++i) {
switch(pAction->peParamPassing[i]) {
case ACT_STRING_PASSING:
CHKiRet(tplToString(pAction->ppTpl[i], pMsg,
&(pWrkrInfo->p.nontx.actParams[i]),
ttNow));
break;
case ACT_ARRAY_PASSING:
CHKiRet(tplToArray(pAction->ppTpl[i], pMsg,
(uchar***) &(pWrkrInfo->p.nontx.actParams[i].param), ttNow));
break;
case ACT_MSG_PASSING:
pWrkrInfo->p.nontx.actParams[i].param = (void*) pMsg;
break;
case ACT_JSON_PASSING:
CHKiRet(tplToJSON(pAction->ppTpl[i], pMsg, &json, ttNow));
pWrkrInfo->p.nontx.actParams[i].param = (void*) json;
break;
default:dbgprintf("software bug/error: unknown pAction->peParamPassing[%d] %d in prepareDoActionParams\n",
i, (int) pAction->peParamPassing[i]);
break;
}
}
}
finalize_it:
RETiRet;
}
static void
releaseDoActionParams(action_t *__restrict__ const pAction, wti_t *__restrict__ const pWti)
{
int jArr;
int j;
actWrkrInfo_t *__restrict__ pWrkrInfo;
uchar ***ppMsgs;
pWrkrInfo = &(pWti->actWrkrInfo[pAction->iActionNbr]);
for(j = 0 ; j < pAction->iNumTpls ; ++j) {
switch(pAction->peParamPassing[j]) {
case ACT_ARRAY_PASSING:
ppMsgs = (uchar***) pWrkrInfo->p.nontx.actParams[0].param;
if(((uchar**)ppMsgs)[j] != NULL) {
jArr = 0;
while(ppMsgs[j][jArr] != NULL) {
free(ppMsgs[j][jArr]);
ppMsgs[j][jArr] = NULL;
++jArr;
}
free(((uchar**)ppMsgs)[j]);
((uchar**)ppMsgs)[j] = NULL;
}
break;
case ACT_JSON_PASSING:
json_object_put((struct json_object*)
pWrkrInfo->p.nontx.actParams[j].param);
pWrkrInfo->p.nontx.actParams[j].param = NULL;
break;
case ACT_STRING_PASSING:
case ACT_MSG_PASSING:
/* no need to do anything with these */
break;