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/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdint.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <regex.h>

#include <rte_eal.h>
#include <rte_log.h>
#include <rte_per_lcore.h>

#include "eal_private.h"

/* global log structure */
struct rte_logs rte_logs = {
	.type = ~0,
	.level = RTE_LOG_DEBUG,
	.file = NULL,
};

/* Stream to use for logging if rte_logs.file is NULL */
static FILE *default_log_stream;

/**
 * This global structure stores some informations about the message
 * that is currently being processed by one lcore
 */
struct log_cur_msg {
	uint32_t loglevel; /**< log level - see rte_log.h */
	uint32_t logtype;  /**< log type  - see rte_log.h */
};

struct rte_log_dynamic_type {
	const char *name;
	uint32_t loglevel;
};

 /* per core log */
static RTE_DEFINE_PER_LCORE(struct log_cur_msg, log_cur_msg);

/* default logs */

/* Change the stream that will be used by logging system */
int
rte_openlog_stream(FILE *f)
{
	rte_logs.file = f;
	return 0;
}

/* Set global log level */
void
rte_log_set_global_level(uint32_t level)
{
	rte_logs.level = (uint32_t)level;
}

/* Get global log level */
uint32_t
rte_log_get_global_level(void)
{
	return rte_logs.level;
}

int
rte_log_get_level(uint32_t type)
{
	if (type >= rte_logs.dynamic_types_len)
		return -1;

	return rte_logs.dynamic_types[type].loglevel;
}

int
rte_log_set_level(uint32_t type, uint32_t level)
{
	if (type >= rte_logs.dynamic_types_len)
		return -1;
	if (level > RTE_LOG_DEBUG)
		return -1;

	rte_logs.dynamic_types[type].loglevel = level;

	return 0;
}

/* set level */
int
rte_log_set_level_regexp(const char *pattern, uint32_t level)
{
	regex_t r;
	size_t i;

	if (level > RTE_LOG_DEBUG)
		return -1;

	if (regcomp(&r, pattern, 0) != 0)
		return -1;

	for (i = 0; i < rte_logs.dynamic_types_len; i++) {
		if (rte_logs.dynamic_types[i].name == NULL)
			continue;
		if (regexec(&r, rte_logs.dynamic_types[i].name, 0,
				NULL, 0) == 0)
			rte_logs.dynamic_types[i].loglevel = level;
	}

	return 0;
}

/* get the current loglevel for the message being processed */
int rte_log_cur_msg_loglevel(void)
{
	return RTE_PER_LCORE(log_cur_msg).loglevel;
}

/* get the current logtype for the message being processed */
int rte_log_cur_msg_logtype(void)
{
	return RTE_PER_LCORE(log_cur_msg).logtype;
}

static int
rte_log_lookup(const char *name)
{
	size_t i;

	for (i = 0; i < rte_logs.dynamic_types_len; i++) {
		if (rte_logs.dynamic_types[i].name == NULL)
			continue;
		if (strcmp(name, rte_logs.dynamic_types[i].name) == 0)
			return i;
	}

	return -1;
}

/* register an extended log type, assuming table is large enough, and id
 * is not yet registered.
 */
static int
__rte_log_register(const char *name, int id)
{
	char *dup_name = strdup(name);

	if (dup_name == NULL)
		return -ENOMEM;

	rte_logs.dynamic_types[id].name = dup_name;
	rte_logs.dynamic_types[id].loglevel = RTE_LOG_DEBUG;

	return id;
}

/* register an extended log type */
int
rte_log_register(const char *name)
{
	struct rte_log_dynamic_type *new_dynamic_types;
	int id, ret;

	id = rte_log_lookup(name);
	if (id >= 0)
		return id;

	new_dynamic_types = realloc(rte_logs.dynamic_types,
		sizeof(struct rte_log_dynamic_type) *
		(rte_logs.dynamic_types_len + 1));
	if (new_dynamic_types == NULL)
		return -ENOMEM;
	rte_logs.dynamic_types = new_dynamic_types;

	ret = __rte_log_register(name, rte_logs.dynamic_types_len);
	if (ret < 0)
		return ret;

	rte_logs.dynamic_types_len++;

	return ret;
}

struct logtype {
	uint32_t log_id;
	const char *logtype;
};

static const struct logtype logtype_strings[] = {
	{RTE_LOGTYPE_EAL,        "eal"},
	{RTE_LOGTYPE_MALLOC,     "malloc"},
	{RTE_LOGTYPE_RING,       "ring"},
	{RTE_LOGTYPE_MEMPOOL,    "mempool"},
	{RTE_LOGTYPE_TIMER,      "timer"},
	{RTE_LOGTYPE_PMD,        "pmd"},
	{RTE_LOGTYPE_HASH,       "hash"},
	{RTE_LOGTYPE_LPM,        "lpm"},
	{RTE_LOGTYPE_KNI,        "kni"},
	{RTE_LOGTYPE_ACL,        "acl"},
	{RTE_LOGTYPE_POWER,      "power"},
	{RTE_LOGTYPE_METER,      "meter"},
	{RTE_LOGTYPE_SCHED,      "sched"},
	{RTE_LOGTYPE_PORT,       "port"},
	{RTE_LOGTYPE_TABLE,      "table"},
	{RTE_LOGTYPE_PIPELINE,   "pipeline"},
	{RTE_LOGTYPE_MBUF,       "mbuf"},
	{RTE_LOGTYPE_CRYPTODEV,  "cryptodev"},
	{RTE_LOGTYPE_EFD,        "efd"},
	{RTE_LOGTYPE_EVENTDEV,   "eventdev"},
	{RTE_LOGTYPE_USER1,      "user1"},
	{RTE_LOGTYPE_USER2,      "user2"},
	{RTE_LOGTYPE_USER3,      "user3"},
	{RTE_LOGTYPE_USER4,      "user4"},
	{RTE_LOGTYPE_USER5,      "user5"},
	{RTE_LOGTYPE_USER6,      "user6"},
	{RTE_LOGTYPE_USER7,      "user7"},
	{RTE_LOGTYPE_USER8,      "user8"}
};

/* Logging should be first initializer (before drivers and bus) */
RTE_INIT_PRIO(rte_log_init, 101);
static void
rte_log_init(void)
{
	uint32_t i;

#if RTE_LOG_LEVEL >= RTE_LOG_DEBUG
	rte_log_set_global_level(RTE_LOG_INFO);
#else
	rte_log_set_global_level(RTE_LOG_LEVEL);
#endif

	rte_logs.dynamic_types = calloc(RTE_LOGTYPE_FIRST_EXT_ID,
		sizeof(struct rte_log_dynamic_type));
	if (rte_logs.dynamic_types == NULL)
		return;

	/* register legacy log types */
	for (i = 0; i < RTE_DIM(logtype_strings); i++)
		__rte_log_register(logtype_strings[i].logtype,
				logtype_strings[i].log_id);

	rte_logs.dynamic_types_len = RTE_LOGTYPE_FIRST_EXT_ID;
}

static const char *
loglevel_to_string(uint32_t level)
{
	switch (level) {
	case 0: return "disabled";
	case RTE_LOG_EMERG: return "emerg";
	case RTE_LOG_ALERT: return "alert";
	case RTE_LOG_CRIT: return "critical";
	case RTE_LOG_ERR: return "error";
	case RTE_LOG_WARNING: return "warning";
	case RTE_LOG_NOTICE: return "notice";
	case RTE_LOG_INFO: return "info";
	case RTE_LOG_DEBUG: return "debug";
	default: return "unknown";
	}
}

/* dump global level and registered log types */
void
rte_log_dump(FILE *f)
{
	size_t i;

	fprintf(f, "global log level is %s\n",
		loglevel_to_string(rte_log_get_global_level()));

	for (i = 0; i < rte_logs.dynamic_types_len; i++) {
		if (rte_logs.dynamic_types[i].name == NULL)
			continue;
		fprintf(f, "id %zu: %s, level is %s\n",
			i, rte_logs.dynamic_types[i].name,
			loglevel_to_string(rte_logs.dynamic_types[i].loglevel));
	}
}

/*
 * Generates a log message The message will be sent in the stream
 * defined by the previous call to rte_openlog_stream().
 */
int
rte_vlog(uint32_t level, uint32_t logtype, const char *format, va_list ap)
{
	int ret;
	FILE *f = rte_logs.file;
	if (f == NULL) {
		f = default_log_stream;
		if (f == NULL) {
			/*
			 * Grab the current value of stderr here, rather than
			 * just initializing default_log_stream to stderr. This
			 * ensures that we will always use the current value
			 * of stderr, even if the application closes and
			 * reopens it.
			 */
			f = stderr;
		}
	}

	if (level > rte_logs.level)
		return 0;
	if (logtype >= rte_logs.dynamic_types_len)
		return -1;
	if (level > rte_logs.dynamic_types[logtype].loglevel)
		return 0;

	/* save loglevel and logtype in a global per-lcore variable */
	RTE_PER_LCORE(log_cur_msg).loglevel = level;
	RTE_PER_LCORE(log_cur_msg).logtype = logtype;

	ret = vfprintf(f, format, ap);
	fflush(f);
	return ret;
}

/*
 * Generates a log message The message will be sent in the stream
 * defined by the previous call to rte_openlog_stream().
 * No need to check level here, done by rte_vlog().
 */
int
rte_log(uint32_t level, uint32_t logtype, const char *format, ...)
{
	va_list ap;
	int ret;

	va_start(ap, format);
	ret = rte_vlog(level, logtype, format, ap);
	va_end(ap);
	return ret;
}

/*
 * Called by environment-specific initialization functions.
 */
void
eal_log_set_default(FILE *default_log)
{
	default_log_stream = default_log;

#if RTE_LOG_DP_LEVEL >= RTE_LOG_DEBUG
	RTE_LOG(NOTICE, EAL,
		"Debug dataplane logs available - lower performance\n");
#endif
}