/*
 * Copyright (C) 1994-2021 Altair Engineering, Inc.
 * For more information, contact Altair at www.altair.com.
 *
 * This file is part of both the OpenPBS software ("OpenPBS")
 * and the PBS Professional ("PBS Pro") software.
 *
 * Open Source License Information:
 *
 * OpenPBS is free software. You can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * OpenPBS 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 Affero General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Commercial License Information:
 *
 * PBS Pro is commercially licensed software that shares a common core with
 * the OpenPBS software.  For a copy of the commercial license terms and
 * conditions, go to: (http://www.pbspro.com/agreement.html) or contact the
 * Altair Legal Department.
 *
 * Altair's dual-license business model allows companies, individuals, and
 * organizations to create proprietary derivative works of OpenPBS and
 * distribute them - whether embedded or bundled with other software -
 * under a commercial license agreement.
 *
 * Use of Altair's trademarks, including but not limited to "PBS™",
 * "OpenPBS®", "PBS Professional®", and "PBS Pro™" and Altair's logos is
 * subject to Altair's trademark licensing policies.
 */

#include <pbs_config.h> /* the master config generated by configure */

/*
 * @file	stat_job.c
 *
 * @brief
 * 	stat_job.c	-	Functions which support the Status Job Batch Request.
 *
 * Included funtions are:
 *	svrcached()
 *	status_attrib()
 *	status_job()
 *	status_subjob()
 *
 */
#include <sys/types.h>
#include <stdlib.h>
#include "libpbs.h"
#include <ctype.h>
#include <time.h>
#include "server_limits.h"
#include "list_link.h"
#include "attribute.h"
#include "server.h"
#include "credential.h"
#include "batch_request.h"
#include "job.h"
#include "reservation.h"
#include "queue.h"
#include "work_task.h"
#include "pbs_error.h"
#include "pbs_nodes.h"
#include "svrfunc.h"
#include "pbs_ifl.h"
#include "ifl_internal.h"

/* Global Data Items: */

extern attribute_def job_attr_def[];
extern int resc_access_perm; /* see encode_resc() in attr_fn_resc.c */
extern struct server server;
extern char statechars[];
extern time_t time_now;

/**
 * @brief
 * 		svrcached - either link in (to phead) a cached svrattrl struct which is
 *		pointed to by the attribute, or if the cached struct isn't there or
 *		is out of date, then replace it with a new svrattrl structure.
 * @par
 *		When replacing, unlink and delete old one if the reference count goes
 *		to zero.
 *
 * @par[in,out]	pat	-	attribute structure which contains a cached svrattrl struct
 * @par[in,out]	phead	-	list of new attribute values
 * @par[in]	pdef	-	attribute for any parent object.
 *
 * @note
 *	If an attribute has the ATR_DFLAG_HIDDEN flag set, then no
 *	need to obtain and cache new svrattrl values.
 */

static void
svrcached(attribute *pat, pbs_list_head *phead, attribute_def *pdef)
{
	svrattrl *working = NULL;
	svrattrl *wcopy;
	svrattrl *encoded;

	if (pdef == NULL)
		return;

	if ((pdef->at_flags & ATR_DFLAG_HIDDEN) &&
	    (get_sattr_long(SVR_ATR_show_hidden_attribs) == 0)) {
		return;
	}
	if (pat->at_flags & ATR_VFLAG_MODCACHE) {
		/* free old cache value if the value has changed */
		free_svrcache(pat);
		encoded = NULL;
	} else {
		if (resc_access_perm & PRIV_READ)
			encoded = pat->at_priv_encoded;
		else
			encoded = pat->at_user_encoded;
	}

	if ((encoded == NULL) || (pat->at_flags & ATR_VFLAG_MODCACHE)) {
		if (is_attr_set(pat)) {
			/* encode and cache new svrattrl structure */
			(void) pdef->at_encode(pat, phead, pdef->at_name,
					       NULL, ATR_ENCODE_CLIENT, &working);
			if (resc_access_perm & PRIV_READ)
				pat->at_priv_encoded = working;
			else
				pat->at_user_encoded = working;

			pat->at_flags &= ~ATR_VFLAG_MODCACHE;
			while (working) {
				working->al_refct++; /* incr ref count */
				working = working->al_sister;
			}
		}
	} else {
		/* can use the existing cached svrattrl struture */

		working = encoded;
		if (working->al_refct < 2) {
			while (working) {
				CLEAR_LINK(working->al_link);
				if (phead != NULL)
					append_link(phead, &working->al_link, working);
				working->al_refct++; /* incr ref count */
				working = working->al_sister;
			}
		} else {
			/*
			 * already linked in, must make a copy to link
			 * NOTE: the copy points to the original's data
			 * so it should be freed by itself, hence the
			 * ref count is set to 1 and the sisters are not
			 * linked in
			 */
			while (working) {
				wcopy = malloc(sizeof(struct svrattrl));
				if (wcopy) {
					*wcopy = *working;
					working = working->al_sister;
					CLEAR_LINK(wcopy->al_link);
					if (phead != NULL)
						append_link(phead, &wcopy->al_link, wcopy);
					wcopy->al_refct = 1;
					wcopy->al_sister = NULL;
				}
			}
		}
	}
}

/*
 * status_attrib - add each requested or all attributes to the status reply
 *
 * @param[in,out]	pal 	-	specific attributes to status
 * @param[in]		pidx 	-	Search index of the attribute array
 * @param[in]		padef	-	attribute definition structure
 * @param[in,out]	pattr	-	attribute structure
 * @param[in]		limit	-	limit on size of def array
 * @param[in]		priv	-	user-client privilege
 * @param[in,out]	phead	-	pbs_list_head
 * @param[out]		bad 	-	RETURN: index of first bad attribute
 *
 * @return	int
 * @retval	0	: success
 * @retval	-1	: on error (bad attribute)
 */

int
status_attrib(svrattrl *pal, void *pidx, attribute_def *padef, attribute *pattr, int limit, int priv, pbs_list_head *phead, int *bad)
{
	int index;
	int nth = 0;

	priv &= (ATR_DFLAG_RDACC | ATR_DFLAG_SvWR); /* user-client privilege */
	resc_access_perm = priv;		    /* pass privilege to encode_resc()	*/

	/* for each attribute asked for or for all attributes, add to reply */

	if (pal) { /* client specified certain attributes */
		while (pal) {
			++nth;
			index = find_attr(pidx, padef, pal->al_name);
			if (index < 0) {
				*bad = nth;
				return (-1);
			}
			if ((padef + index)->at_flags & priv) {
				svrcached(pattr + index, phead, padef + index);
			}
			pal = (svrattrl *) GET_NEXT(pal->al_link);
		}
	} else { /* non specified, return all readable attributes */
		for (index = 0; index < limit; index++) {
			if ((padef + index)->at_flags & priv) {
				svrcached(pattr + index, phead, padef + index);
			}
		}
	}
	return (0);
}

/**
 * @brief
 * 		status_job - Build the status reply for a single job, regular or Array,
 *		but not a subjob of an Array Job.
 *
 * @param[in,out]	pjob	-	ptr to job to status
 * @param[in]		preq	-	request structure
 * @param[in]		pal	-	specific attributes to status
 * @param[in,out]	pstathd	-	RETURN: head of list to append status to
 * @param[out]		bad	-	RETURN: index of first bad attribute
 * @param[in]		dosubjobs -	flag to expand a Array job to include all subjobs
 *
 * @return	int
 * @retval	0	: success
 * @retval	PBSE_PERM	: client is not authorized to status the job
 * @retval	PBSE_SYSTEM	: memory allocation error
 * @retval	PBSE_NOATTR	: attribute error
 */

int
status_job(job *pjob, struct batch_request *preq, svrattrl *pal, pbs_list_head *pstathd, int *bad, int dosubjobs)
{
	struct brp_status *pstat;
	long oldtime = 0;
	int old_elig_flags = 0;
	int old_atyp_flags = 0;
	int revert_state_r = 0;

	/* see if the client is authorized to status this job */

	if (!get_sattr_long(SVR_ATR_query_others))
		if (svr_authorize_jobreq(preq, pjob))
			return (PBSE_PERM);

	/* calc eligible time on the fly and return, don't save. */
	if (get_sattr_long(SVR_ATR_EligibleTimeEnable) == TRUE) {
		if (get_jattr_long(pjob, JOB_ATR_accrue_type) == JOB_ELIGIBLE) {
			oldtime = get_jattr_long(pjob, JOB_ATR_eligible_time);
			set_jattr_l_slim(pjob, JOB_ATR_eligible_time,
					 time_now - get_jattr_long(pjob, JOB_ATR_sample_starttime), INCR);
		}
	} else {
		/* eligible_time_enable is off so, clear set flag so that eligible_time and accrue type dont show */
		old_elig_flags = get_jattr(pjob, JOB_ATR_eligible_time)->at_flags;
		mark_jattr_not_set(pjob, JOB_ATR_eligible_time);

		old_atyp_flags = get_jattr(pjob, JOB_ATR_accrue_type)->at_flags;
		mark_jattr_not_set(pjob, JOB_ATR_accrue_type);
	}

	/* allocate reply structure and fill in header portion */

	pstat = (struct brp_status *) malloc(sizeof(struct brp_status));
	if (pstat == NULL)
		return (PBSE_SYSTEM);
	CLEAR_LINK(pstat->brp_stlink);
	if ((pjob->ji_qs.ji_svrflags & JOB_SVFLG_ArrayJob) != 0 && dosubjobs)
		pstat->brp_objtype = MGR_OBJ_JOBARRAY_PARENT;
	else if ((pjob->ji_qs.ji_svrflags & JOB_SVFLG_SubJob) != 0 && dosubjobs)
		pstat->brp_objtype = MGR_OBJ_SUBJOB;
	else
		pstat->brp_objtype = MGR_OBJ_JOB;
	(void) strcpy(pstat->brp_objname, pjob->ji_qs.ji_jobid);
	CLEAR_HEAD(pstat->brp_attr);
	append_link(pstathd, &pstat->brp_stlink, pstat);
	preq->rq_reply.brp_count++;

	/* Temporarily set suspend/user suspend states for the stat */
	if (check_job_state(pjob, JOB_STATE_LTR_RUNNING)) {
		if (pjob->ji_qs.ji_svrflags & JOB_SVFLG_Suspend) {
			set_job_state(pjob, JOB_STATE_LTR_SUSPENDED);
			revert_state_r = 1;
		} else if (pjob->ji_qs.ji_svrflags & JOB_SVFLG_Actsuspd) {
			set_job_state(pjob, JOB_STATE_LTR_USUSPENDED);
			revert_state_r = 1;
		}
	}

	/* add attributes to the status reply */

	*bad = 0;
	if (status_attrib(pal, job_attr_idx, job_attr_def, pjob->ji_wattr, JOB_ATR_LAST, preq->rq_perm, &pstat->brp_attr, bad))
		return (PBSE_NOATTR);

	/* reset eligible time, it was calctd on the fly, real calctn only when accrue_type changes */

	if (get_sattr_long(SVR_ATR_EligibleTimeEnable) != 0) {
		if (get_jattr_long(pjob, JOB_ATR_accrue_type) == JOB_ELIGIBLE)
			set_jattr_l_slim(pjob, JOB_ATR_eligible_time, oldtime, SET);
	} else {
		/* reset the set flags */
		get_jattr(pjob, JOB_ATR_eligible_time)->at_flags = old_elig_flags;

		get_jattr(pjob, JOB_ATR_accrue_type)->at_flags = old_atyp_flags;
	}

	if (revert_state_r)
		set_job_state(pjob, JOB_STATE_LTR_RUNNING);

	return (0);
}

/**
 * @brief
 * 		status_subjob - status a single subjob (of an Array Job)
 *		Works by statusing the parrent unless subjob is actually running.
 *
 * @param[in,out]	pjob	-	ptr to parent Array
 * @param[in]		preq	-	request structure
 * @param[in]		pal	-	specific attributes to status
 * @param[in]		subj	-	if not = -1 then include subjob [n]
 * @param[in,out]	pstathd	-	RETURN: head of list to append status to
 * @param[out]		bad	-	RETURN: index of first bad attribute
 * @param[in]		dosubjobs -	flag to expand a Array job to include all subjobs
 *
 * @return	int
 * @retval	0	: success
 * @retval	PBSE_PERM	: client is not authorized to status the job
 * @retval	PBSE_SYSTEM	: memory allocation error
 * @retval	PBSE_IVALREQ	: something wrong with the flags
 */
int
status_subjob(job *pjob, struct batch_request *preq, svrattrl *pal, int subj, pbs_list_head *pstathd, int *bad, int dosubjobs)
{
	int limit = (int) JOB_ATR_LAST;
	struct brp_status *pstat;
	job *psubjob; /* ptr to job to status */
	char realstate;
	int rc = 0;
	int oldeligflags = 0;
	int oldatypflags = 0;
	char *old_subjob_comment = NULL;
	char sjst;
	int sjsst;
	char *objname;

	/* see if the client is authorized to status this job */

	if (!get_sattr_long(SVR_ATR_query_others))
		if (svr_authorize_jobreq(preq, pjob))
			return (PBSE_PERM);

	if ((pjob->ji_qs.ji_svrflags & JOB_SVFLG_ArrayJob) == 0)
		return PBSE_IVALREQ;

	/* if subjob job obj exists, use real job structure */

	psubjob = get_subjob_and_state(pjob, subj, &sjst, &sjsst);
	if (psubjob)
		return status_job(psubjob, preq, pal, pstathd, bad, dosubjobs);

	if (sjst == JOB_STATE_LTR_UNKNOWN)
		return PBSE_UNKJOBID;

	/* otherwise we fake it with info from the parent      */
	/* allocate reply structure and fill in header portion */

	objname = create_subjob_id(pjob->ji_qs.ji_jobid, subj);
	if (objname == NULL)
		return PBSE_SYSTEM;

	/* for the general case, we don't want to include the parent's */
	/* array related attrbutes as they belong only to the Array    */
	if (pal == NULL)
		limit = JOB_ATR_array;
	pstat = (struct brp_status *) malloc(sizeof(struct brp_status));
	if (pstat == NULL)
		return (PBSE_SYSTEM);
	CLEAR_LINK(pstat->brp_stlink);
	if (dosubjobs)
		pstat->brp_objtype = MGR_OBJ_SUBJOB;
	else
		pstat->brp_objtype = MGR_OBJ_JOB;
	(void) strcpy(pstat->brp_objname, objname);
	CLEAR_HEAD(pstat->brp_attr);
	append_link(pstathd, &pstat->brp_stlink, pstat);
	preq->rq_reply.brp_count++;

	/* add attributes to the status reply */

	*bad = 0;

	/*
	 * fake the job state and comment by setting the parent job's state
	 * and comment to that of the subjob
	 */
	realstate = get_job_state(pjob);
	set_job_state(pjob, sjst);

	if (sjst == JOB_STATE_LTR_EXPIRED || sjst == JOB_STATE_LTR_FINISHED) {
		if (sjsst == JOB_SUBSTATE_FINISHED) {
			if (is_jattr_set(pjob, JOB_ATR_Comment)) {
				old_subjob_comment = strdup(get_jattr_str(pjob, JOB_ATR_Comment));
				if (old_subjob_comment == NULL)
					return (PBSE_SYSTEM);
			}
			if (set_jattr_str_slim(pjob, JOB_ATR_Comment, "Subjob finished", NULL)) {
				return (PBSE_SYSTEM);
			}
		} else if (sjsst == JOB_SUBSTATE_FAILED) {
			if (is_jattr_set(pjob, JOB_ATR_Comment)) {
				old_subjob_comment = strdup(get_jattr_str(pjob, JOB_ATR_Comment));
				if (old_subjob_comment == NULL)
					return (PBSE_SYSTEM);
			}
			if (set_jattr_str_slim(pjob, JOB_ATR_Comment, "Subjob failed", NULL)) {
				return (PBSE_SYSTEM);
			}
		} else if (sjsst == JOB_SUBSTATE_TERMINATED) {
			if (is_jattr_set(pjob, JOB_ATR_Comment)) {
				old_subjob_comment = strdup(get_jattr_str(pjob, JOB_ATR_Comment));
				if (old_subjob_comment == NULL)
					return (PBSE_SYSTEM);
			}
			if (set_jattr_str_slim(pjob, JOB_ATR_Comment, "Subjob terminated", NULL)) {
				return (PBSE_SYSTEM);
			}
		}
	}

	/* when eligible_time_enable is off,				      */
	/* clear the set flag so that eligible_time and accrue_type dont show */
	if (get_sattr_long(SVR_ATR_EligibleTimeEnable) == 0) {
		attribute *attr = get_jattr(pjob, JOB_ATR_eligible_time);

		oldeligflags = attr->at_flags;
		mark_jattr_not_set(pjob, JOB_ATR_eligible_time);

		attr = get_jattr(pjob, JOB_ATR_accrue_type);
		oldatypflags = attr->at_flags;
		mark_jattr_not_set(pjob, JOB_ATR_accrue_type);
	}

	if (status_attrib(pal, job_attr_idx, job_attr_def, pjob->ji_wattr, limit, preq->rq_perm, &pstat->brp_attr, bad))
		rc = PBSE_NOATTR;

	/* Set the parent state back to what it really is */
	set_job_state(pjob, realstate);

	/* Set the parent comment back to what it really is */
	if (old_subjob_comment != NULL) {
		if (set_jattr_str_slim(pjob, JOB_ATR_Comment, old_subjob_comment, NULL)) {
			return (PBSE_SYSTEM);
		}

		free(old_subjob_comment);
	}

	/* reset the flags */
	if (get_sattr_long(SVR_ATR_EligibleTimeEnable) == 0) {
		attribute *attr = get_jattr(pjob, JOB_ATR_eligible_time);
		attr->at_flags = oldeligflags;

		attr = get_jattr(pjob, JOB_ATR_accrue_type);
		attr->at_flags = oldatypflags;
	}

	return (rc);
}