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File: annot.c

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liblognorm 0.3.4-1
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/**
 * @file annot.c
 * @brief Implementation of the annotation set object.
 * @class ln_annot annot.h
 *//*
 * Copyright 2011 by Rainer Gerhards and Adiscon GmbH.
 *
 * This file is part of liblognorm.
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Sannott, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * A copy of the LGPL v2.1 can be found in the file "COPYING" in this distribution.
 */
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>
#include <libestr.h>
#include <libee/libee.h>
#include <libee/event.h>

#include "liblognorm.h"
#include "lognorm.h"
#include "samp.h"
#include "annot.h"
#include "internal.h"

ln_annotSet*
ln_newAnnotSet(ln_ctx ctx)
{
	ln_annotSet *as;

	if((as = calloc(1, sizeof(struct ln_annotSet_s))) == NULL)
		goto done;
	as->ctx = ctx;
done:	return as;
}


void
ln_deleteAnnotSet(ln_annotSet *as)
{
	ln_annot *node, *nodeDel;
	if(as == NULL)
		goto done;

	for(node = as->aroot ; node != NULL ; ) {
		nodeDel = node;
		node = node->next;
		ln_deleteAnnot(nodeDel);
	}
	free(as);
done:	return;
}


ln_annot*
ln_findAnnot(ln_annotSet *as, es_str_t *tag)
{
	ln_annot *annot;
	if(as == NULL) {
		annot = NULL;
		goto done;
	}

	for(  annot = as->aroot
	    ; annot != NULL && es_strcmp(annot->tag, tag)
	    ; annot = annot->next) {
		; /* do nothing, just search... */
	}
done:	return annot;
}


/**
 * Combine two annotations.
 * @param[in] annot currently existing and surviving annotation
 * @param[in] add   annotation to be added. This will be destructed
 *                  as part of the process.
 * @returns 0 if ok, something else otherwise
 */
inline int
ln_combineAnnot(ln_annot *annot, ln_annot *add)
{
	int r = 0;
	ln_annot_op *op, *opdel;

	for(op = add->oproot ; op != NULL ; ) {
		CHKR(ln_addAnnotOp(annot, op->opc, op->name, op->value));
		opdel = op;
		op = op->next;
		free(opdel);
	}
done:	return r;
}


int
ln_addAnnotToSet(ln_annotSet *as, ln_annot *annot)
{
	int r = 0;
	ln_annot *aexist;
	assert(annot->tag != NULL);
	aexist = ln_findAnnot(as, annot->tag);
	if(aexist == NULL) {
		/* does not yet exist, simply store new annot */
		annot->next = as->aroot;
		as->aroot = annot;
	} else { /* annotation already exists, combine */
		r = ln_combineAnnot(aexist, annot);
	}
	return r;
}


ln_annot*
ln_newAnnot(es_str_t *tag)
{
	ln_annot *annot;

	if((annot = calloc(1, sizeof(struct ln_annot_s))) == NULL)
		goto done;
	annot->tag = tag;
done:	return annot;
}


void
ln_deleteAnnot(ln_annot *annot)
{
	ln_annot_op *node, *nodeDel;
	if(annot == NULL)
		goto done;

	for(node = annot->oproot ; node != NULL ; ) {
		nodeDel = node;
		es_deleteStr(node->name);
		if(node->value != NULL)
			es_deleteStr(node->value);
		node = node->next;
		free(nodeDel);
	}
	free(annot);
done:	return;
}


int
ln_addAnnotOp(ln_annot *annot, ln_annot_opcode opc, es_str_t *name, es_str_t *value)
{
	int r = -1;
	ln_annot_op *node;

	if((node = calloc(1, sizeof(struct ln_annot_op_s))) == NULL)
		goto done;
	node->opc = opc;
	node->name = name;
	node->value = value;

	if(annot->oproot != NULL) {
		node->next = annot->oproot;
	}
	annot->oproot = node;
	r = 0;

done:	return r;
}


/* annotate the event with a specific tag. helper to keep code
 * small and easy to follow.
 */
static inline int
ln_annotateEventWithTag(ln_ctx ctx, struct ee_event *event, es_str_t *tag)
{
	int r=0;
	ln_annot *annot;
	ln_annot_op *op;
	struct ee_field *field;

	annot = ln_findAnnot(ctx->pas, tag);
	for(op = annot->oproot ; op != NULL ; op = op->next) {
		if(op->opc == ln_annot_ADD) {
			CHKN(field = ee_newField(ctx->eectx));
			CHKR(ee_nameField(field, op->name));
			CHKR(ee_addStrValueToField(field, op->value));
			CHKR(ee_addFieldToEvent(event, field));
		} else {
			// TODO: implement
		}
	}

done: 	return r;
}


int
ln_annotateEvent(ln_ctx ctx, struct ee_event *event)
{
	int r = 0;
	void *cookie;
	struct ee_tagbucket *tagbucket;
	es_str_t *tag;

	/* shortcut: terminate immediately if nothing to do... */
	if(ctx->pas->aroot == NULL)
		goto done;

	/* iterate over tagbucket */
	ee_EventGetTagbucket(event, &tagbucket);
	cookie = NULL;
	while(1) {
		CHKR(ee_TagbucketGetNextTag(tagbucket, &cookie, &tag));
		if(cookie == NULL)
			break;	/* end iteration */
		CHKR(ln_annotateEventWithTag(ctx, event, tag));
	}

done:	return r;
}