/*
* Parse the attributes component of a PCP connection string.
* Optionally, an initial attribute:value pair can be passed
* in as well to add to the parsed set.
*/
static int
parseAttributeSpec(
const char *spec, /* the original, complete string to parse */
char **position, /* parse from here onward and update at end */
int attribute,
char *value,
__pmHashCtl *attributes,
char **errmsg)
{
char *s, *start, *v = NULL;
char buffer[32]; /* must be large enough to hold largest attr name */
int buflen, attr, len, sts;
if (attribute != PCP_ATTR_NONE)
if ((sts = __pmHashAdd(attribute, (void *)value, attributes)) < 0)
return sts;
for (s = start = *position; s != NULL; s++) {
/* parse: foo=bar&moo&goo=blah ... go! */
if (*s == '\0' || *s == '/' || *s == '&') {
if ((*s == '\0' || *s == '/') && s == start)
break;
len = v ? (v - start - 1) : (s - start);
buflen = (len < sizeof(buffer)-1) ? len : sizeof(buffer)-1;
strncpy(buffer, start, buflen);
buffer[buflen] = '\0';
attr = __pmLookupAttrKey(buffer, buflen+1);
if (attr != PCP_ATTR_NONE) {
char *val = NULL;
if (v && (val = strndup(v, s - v)) == NULL) {
sts = -ENOMEM;
goto fail;
}
if ((sts = __pmHashAdd(attr, (void *)val, attributes)) < 0) {
free(val);
goto fail;
}
}
v = NULL;
if (*s == '\0' || *s == '/')
break;
start = s + 1; /* start of attribute name */
continue;
}
if (*s == '=') {
v = s + 1; /* start of attribute value */
}
}
*position = s;
return 0;
fail:
if (attribute != PCP_ATTR_NONE) /* avoid double free in caller */
__pmHashDel(attribute, (void *)value, attributes);
__pmFreeAttrsSpec(attributes);
return sts;
}
/* Delete every instance of a given metric from the data structure.
* The pmid is deleted from the pmidlist of every task containing an instance.
* Return a pointer to the first pmDesc found (the only thing salvaged from the
* smoking ruins), or nil if no instances were found.
*/
static pmDesc *
del_insts(pmID pmid)
{
optreq_t *rqp;
__pmHashNode *hp;
task_t *tp;
pmDesc *dp = NULL;
int i, sts, keep;
for (hp = __pmHashSearch(pmid, &pm_hash); hp != NULL; ) {
/* Do that BEFORE we nuke the node */
__pmHashNode * nextnode = hp->next;
if (pmid == (pmID)hp->key) {
rqp = (optreq_t *)hp->data;
tp = (task_t *)rqp->r_fetch->f_aux;
if ((sts = __pmOptFetchDel(&tp->t_fetch, rqp)) < 0)
die("del_insts: __pmOptFetchDel", sts);
if ((sts = __pmHashDel(pmid, (void *)rqp, &pm_hash)) < 0)
die("del_insts: __pmHashDel", sts);
/* save the first pmDesc pointer for return and subsequent
* re-use, but free all the others
*/
if (dp != NULL)
free(rqp->r_desc);
else
dp = rqp->r_desc;
if (rqp->r_numinst)
free(rqp->r_instlist);
free(rqp);
/* remove pmid from the task's pmid list */
for (i = 0; i < tp->t_numpmid; i++)
if (tp->t_pmidlist[i] == pmid)
break;
keep = (tp->t_numpmid - 1 - i) * sizeof(tp->t_pmidlist[0]);
if (keep) {
memmove(&tp->t_pmidlist[i], &tp->t_pmidlist[i+1], keep);
memmove(&tp->t_desclist[i], &tp->t_desclist[i+1], keep);
memmove(&tp->t_namelist[i], &tp->t_namelist[i+1], keep);
}
/* don't bother shrinking the pmidlist */
tp->t_numpmid--;
if (tp->t_numpmid == 0) {
/* TODO: nuke the task if that was the last pmID */
}
}
hp = nextnode;
}
return dp;
}
static void
undo(task_t *tp, optreq_t *rqp, int inst)
{
int j;
int k;
int sts;
if (rqp->r_numinst >= 1) {
/* remove instance from list of instance */
for (k =0, j = 0; j < rqp->r_numinst; j++) {
if (rqp->r_instlist[j] != inst)
rqp->r_instlist[k++] = rqp->r_instlist[j];
}
rqp->r_numinst = k;
if ((sts = __pmOptFetchDel(&tp->t_fetch, rqp)) < 0)
die("undo: __pmOptFetchDel", sts);
if (rqp->r_numinst == 0) {
/* no more instances, remove specification */
if (tp->t_fetch == NULL) {
/* no more specifications, remove task */
task_t *xtp;
task_t *ltp = NULL;
for (xtp = tasklist; xtp != NULL; xtp = xtp->t_next) {
if (xtp == tp) {
if (ltp == NULL)
tasklist = tp->t_next;
else
ltp->t_next = tp->t_next;
break;
}
ltp = xtp;
}
}
__pmHashDel(rqp->r_desc->pmid, (void *)rqp, &pm_hash);
free(rqp);
}
else
/* re-insert modified specification */
__pmOptFetchAdd(&tp->t_fetch, rqp);
}
else {
/*
* TODO ... current specification is for all instances,
* need to remove this instance from the set ...
* this requires some enhancement to optFetch
*
* pro tem, this metric-instance pair may continue to get
* logged, even though the logging state is recorded as
* OFF (this is the worst thing that can happen here)
*/
}
}
/* Delete an optreq_t from its task, free it and remove it from the hash list.
*/
static void
del_optreq(optreq_t *rqp)
{
int sts;
task_t *tp = (task_t *)rqp->r_fetch->f_aux;
if ((sts = __pmOptFetchDel(&tp->t_fetch, rqp)) < 0)
die("del_optreq: __pmOptFetchDel", sts);
if ((sts = __pmHashDel(rqp->r_desc->pmid, (void *)rqp, &pm_hash)) < 0)
die("del_optreq: __pmHashDel", sts);
free(rqp->r_desc);
if (rqp->r_numinst)
free(rqp->r_instlist);
free(rqp);
/* TODO: remove pmid from task if that was the last optreq_t for it */
/* TODO: remove task if last pmid removed */
}
/* Update an existing metric (given a pmValueSet) adding it to the specified
* task. Allocate and return a new task_t if the specified task pointer is nil.
*/
static int
update_metric(pmValueSet *vsp, int reqstate, int mflags, task_t **result)
{
pmID pmid = vsp->pmid;
task_t *ntp = *result; /* pointer to new task */
task_t *ctp; /* pointer to current task */
optreq_t *rqp;
pmDesc *dp;
int i, j, inst;
int sts, need = 0;
int addpmid = 0;
int freedp;
/* allocate a new task if null task pointer passed in */
if (ntp == NULL) {
ntp = calloc(1, sizeof(task_t));
if (ntp == NULL) {
__pmNoMem("update_metric: new task calloc", sizeof(task_t),
PM_FATAL_ERR);
}
*result = ntp;
}
if ((mflags & MF_HAS_INDOM) == 0) {
rqp = findoptreq(pmid, 0);
ctp = (task_t *)(rqp->r_fetch->f_aux);
if (!update_ok(ctp->t_state, reqstate))
return 1;
/* if the new state is advisory off, just remove the metric */
if ((PMLC_GET_MAYBE(reqstate)) ||
(PMLC_GET_MAND(reqstate) == 0 && PMLC_GET_ON(reqstate) == 0))
del_optreq(rqp);
else {
/* update the optreq. For single valued metrics there are no
* instances involved so the sole optreq can just be re-used.
*/
if ((sts = __pmOptFetchDel(&ctp->t_fetch, rqp)) < 0)
die("update_metric: 1 metric __pmOptFetchDel", sts);
__pmOptFetchAdd(&ntp->t_fetch, rqp);
linkback(ntp);
addpmid = 1;
}
}
else {
/* metric has an instance domain */
if (vsp->numval > 0) {
/* tricky: since optFetch can't handle instance profiles of the
* form "all except these specific instances", and managing it
* manually is just too hard, reject requests for specific
* metric instances if "all instances" of the metric are already
* being logged.
* Note: advisory off "all instances" is excepted since ANY request
* overrides and advisory off. E.g. "advisory off all" followed by
* "advisory on someinsts" turns on advisory logging for
* "someinsts". mflags will be zero for "advisory off" metrics.
*/
if (mflags & MF_HAS_ALL)
return 1; /* can't turn "all" into specific insts */
for (i = 0; i < vsp->numval; i++) {
dp = NULL;
freedp = 0;
inst = vsp->vlist[i].inst;
rqp = findoptreq(pmid, inst);
if (rqp != NULL) {
dp = rqp->r_desc;
ctp = (task_t *)(rqp->r_fetch->f_aux);
/* no work required if new task and current are the same */
if (ntp == ctp)
continue;
if (!update_ok(ctp->t_state, reqstate))
continue;
/* remove inst's group from current task */
if ((sts = __pmOptFetchDel(&ctp->t_fetch, rqp)) < 0)
die("update_metric: instance add __pmOptFetchDel", sts);
/* put group back if there are any instances left */
if (rqp->r_numinst > 1) {
/* remove inst from group */
for (j = 0; j < rqp->r_numinst; j++)
if (inst == rqp->r_instlist[j])
break;
/* don't call memmove to move zero bytes */
if (j < rqp->r_numinst - 1)
memmove(&rqp->r_instlist[j], &rqp->r_instlist[j+1],
(rqp->r_numinst - 1 - j) *
sizeof(rqp->r_instlist[0]));
rqp->r_numinst--;
/* (don't bother realloc-ing the instlist to a smaller size) */
__pmOptFetchAdd(&ctp->t_fetch, rqp);
linkback(ctp);
/* no need to update hash list, rqp already there */
}
/* if that was the last instance, free the group */
else {
if (( sts = __pmHashDel(pmid, (void *)rqp, &pm_hash)) < 0)
die("update_metric: instance __pmHashDel", sts);
freedp = 1;
free(rqp->r_instlist);
free(rqp);
}
}
/* advisory off (mandatory maybe) metrics don't get put into
* the data structure
*/
if (PMLC_GET_MAYBE(reqstate) ||
(PMLC_GET_MAND(reqstate) == 0 && PMLC_GET_ON(reqstate) == 0)) {
if (freedp)
free(dp);
continue;
}
addpmid = 1;
/* try to find an existing optreq_t for the instance */
rqp = find_instoptreq(ntp, pmid);
if (rqp != NULL) {
if ((sts = __pmOptFetchDel(&ntp->t_fetch, rqp)) < 0)
die("update_metric: instance add __pmOptFetchDel", sts);
}
/* no existing optreq_t found, allocate & populate a new one */
else {
rqp = (optreq_t *)calloc(1, sizeof(optreq_t));
if (rqp == NULL) {
__pmNoMem("update_metric: optreq calloc",
sizeof(optreq_t), PM_FATAL_ERR);
}
/* if the metric existed but the instance didn't, we don't
* have a valid pmDesc (dp), so find one.
*/
if (dp == NULL) {
/* find metric and associated pmDesc */
__pmHashNode *hp;
for (hp = __pmHashSearch(pmid, &pm_hash);
hp != NULL; hp = hp->next) {
if (pmid == (pmID)hp->key)
break;
}
assert(hp != NULL);
dp = ((optreq_t *)hp->data)->r_desc;
}
/* recycle pmDesc from the old group, if possible */
if (freedp) {
rqp->r_desc = dp;
freedp = 0;
}
/* otherwise allocate & copy a new pmDesc via dp */
else {
need = sizeof(pmDesc);
rqp->r_desc = (pmDesc *)malloc(need);
if (rqp->r_desc == NULL) {
__pmNoMem("update_metric: new inst pmDesc malloc",
need, PM_FATAL_ERR);
}
memcpy(rqp->r_desc, dp, need);
}
if ((sts = __pmHashAdd(pmid, (void *)rqp, &pm_hash)) < 0)
die("update_metric: __pmHashAdd", sts);
}
need = (rqp->r_numinst + 1) * sizeof(rqp->r_instlist[0]);
rqp->r_instlist = (int *)realloc(rqp->r_instlist, need);
if (rqp->r_instlist == NULL) {
__pmNoMem("update_metric: inst list resize", need,
PM_FATAL_ERR);
}
rqp->r_instlist[rqp->r_numinst++] = inst;
__pmOptFetchAdd(&ntp->t_fetch, rqp);
linkback(ntp);
if (freedp)
free(dp);
}
}
/* the vset has numval == 0, a request for "all instances" */
else {
/* if the metric is a singular instance that has mandatory logging
* or has at least one instance with mandatory logging on, a
* request for advisory logging cannot be honoured
*/
if ((mflags & MF_HAS_MAND) &&
PMLC_GET_MAND(reqstate) == 0 && PMLC_GET_MAYBE(reqstate) == 0)
return 1;
if (mflags & MF_HAS_ALL) {
/* if there is an "all instances" for the metric, it will be
* the only optreq_t for the metric
*/
rqp = findoptreq(pmid, 0);
ctp = (task_t *)rqp->r_fetch->f_aux;
/* if the metric is "advisory on, all instances" and the
* request is for "mandatory maybe, all instances" the current
* advisory logging state of the metric is retained
*/
if (PMLC_GET_MAND(ctp->t_state) == 0 && PMLC_GET_MAYBE(reqstate))
return 0;
/* advisory off & mandatory maybe metrics don't get put into
* the data structure
*/
if (PMLC_GET_MAYBE(reqstate) ||
(PMLC_GET_MAND(reqstate) == 0 && PMLC_GET_ON(reqstate) == 0)) {
del_optreq(rqp);
return 0;
}
addpmid = 1;
if ((sts = __pmOptFetchDel(&ctp->t_fetch, rqp)) < 0)
die("update_metric: all inst __pmOptFetchDel", sts);
/* don't delete from hash list, rqp re-used */
__pmOptFetchAdd(&ntp->t_fetch, rqp);
linkback(ntp);
}
else {
/* there are one or more specific instances for the metric.
* The metric cannot have an "all instances" at the same time.
*
* if the request is for "mandatory maybe, all instances" and
* the only instances of the metric all have advisory logging
* on, retain the current advisory semantics.
*/
if (PMLC_GET_MAYBE(reqstate) &&
(mflags & MF_HAS_INST) && !(mflags & MF_HAS_MAND))
return 0;
dp = del_insts(pmid);
/* advisory off (mandatory maybe) metrics don't get put into
* the data structure
*/
if (PMLC_GET_MAYBE(reqstate) ||
(PMLC_GET_MAND(reqstate) == 0 && PMLC_GET_ON(reqstate) == 0)) {
free(dp);
return 0;
}
addpmid = 1;
rqp = (optreq_t *)calloc(1, sizeof(optreq_t));
if (rqp == NULL) {
__pmNoMem("update_metric: all inst calloc",
sizeof(optreq_t), PM_FATAL_ERR);
}
rqp->r_desc = dp;
__pmOptFetchAdd(&ntp->t_fetch, rqp);
linkback(ntp);
if ((sts = __pmHashAdd(pmid, (void *)rqp, &pm_hash)) < 0)
die("update_metric: all inst __pmHashAdd", sts);
}
}
}
if (!addpmid)
return 0;
/* add pmid to new task if not already there */
for (i = 0; i < ntp->t_numpmid; i++)
if (pmid == ntp->t_pmidlist[i])
break;
if (i >= ntp->t_numpmid) {
pmDesc desc;
char *name;
int need;
if ((sts = pmLookupDesc(pmid, &desc)) < 0)
die("update_metric: cannot lookup desc", sts);
if ((sts = pmNameID(pmid, &name)) < 0)
die("update_metric: cannot lookup name", sts);
need = (ntp->t_numpmid + 1) * sizeof(pmID);
if (!(ntp->t_pmidlist = (pmID *)realloc(ntp->t_pmidlist, need)))
__pmNoMem("update_metric: grow task pmidlist", need, PM_FATAL_ERR);
need = (ntp->t_numpmid + 1) * sizeof(char *);
if (!(ntp->t_namelist = (char **)realloc(ntp->t_namelist, need)))
__pmNoMem("update_metric: grow task namelist", need, PM_FATAL_ERR);
need = (ntp->t_numpmid + 1) * sizeof(pmDesc);
if (!(ntp->t_desclist = (pmDesc *)realloc(ntp->t_desclist, need)))
__pmNoMem("update_metric: grow task desclist", need, PM_FATAL_ERR);
i = ntp->t_numpmid;
ntp->t_pmidlist[i] = pmid;
ntp->t_namelist[i] = name;
ntp->t_desclist[i] = desc;
ntp->t_numpmid++;
}
return 0;
}
