/*
 * graphite.c
 *
 *  Created on: Jan 19, 2015
 *      Author: fmetz
 */
#include <sys/types.h>
#include <sys/socket.h>
#include <poll.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <string.h>

#include "log.h"
#include "call.h"
#include "graphite.h"
#include "socket.h"
#include "statistics.h"
#include "main.h"

struct timeval rtpe_latest_graphite_interval_start;

static socket_t graphite_sock;
static int connection_state = STATE_DISCONNECTED;
//struct totalstats totalstats_prev;
static time_t next_run;
// HEAD: static time_t rtpe_now, next_run;
static char* graphite_prefix = NULL;
static struct timeval graphite_interval_tv;

struct global_stats_counter rtpe_stats_graphite_diff;		// per-interval increases
static struct global_stats_counter rtpe_stats_graphite_intv;	// copied out when graphite stats run

struct global_gauge_min_max rtpe_gauge_graphite_min_max;
struct global_gauge_min_max rtpe_gauge_graphite_min_max_sampled;

struct global_rate_min_max rtpe_rate_graphite_min_max;
struct global_rate_min_max_avg rtpe_rate_graphite_min_max_avg_sampled;

struct global_sampled_min_max rtpe_sampled_graphite_min_max;
struct global_sampled_min_max rtpe_sampled_graphite_min_max_sampled;
static struct global_stats_sampled rtpe_sampled_graphite_min_max_diff;
static struct global_stats_sampled rtpe_sampled_graphite_min_max_intv;
struct global_sampled_avg rtpe_sampled_graphite_avg;


void set_graphite_interval_tv(struct timeval *tv) {
	graphite_interval_tv = *tv;
}

void set_prefix(char* prefix) {
	graphite_prefix = g_strdup(prefix);
}

void free_prefix(void) {
	g_free(graphite_prefix);
}

static int connect_to_graphite_server(const endpoint_t *graphite_ep) {
	int rc;

        if (!graphite_ep) {
                ilog(LOG_ERROR, "NULL graphite_ep");
                return -1;
        }

	ilog(LOG_INFO, "Connecting to graphite server %s", endpoint_print_buf(graphite_ep));

	rc = connect_socket_nb(&graphite_sock, SOCK_STREAM, graphite_ep);

	if (rtpe_config.graphite_timeout > 0 && !(graphite_sock.fd < 0)) {
		usertimeout(graphite_sock.fd, rtpe_config.graphite_timeout * 1000);
	}

	if (rc == -1) {
		ilog(LOG_ERROR,"Couldn't make socket for connecting to graphite.");
		return -1;
	}
	if (rc == 0)
		ilog(LOG_INFO, "Graphite server connected.");
	else {
		/* EINPROGRESS */
		ilog(LOG_INFO, "Connection to graphite is in progress.");
		connection_state = STATE_IN_PROGRESS;
	}

	return 0;
}

GString *print_graphite_data(void) {

	long long time_diff_us = timeval_diff(&rtpe_now, &rtpe_latest_graphite_interval_start);
	rtpe_latest_graphite_interval_start = rtpe_now;

	stats_counters_calc_diff(&rtpe_stats, &rtpe_stats_graphite_intv, &rtpe_stats_graphite_diff);
	stats_rate_min_max_avg_sample(&rtpe_rate_graphite_min_max, &rtpe_rate_graphite_min_max_avg_sampled,
			time_diff_us, &rtpe_stats_graphite_diff);

	stats_gauge_min_max_sample(&rtpe_gauge_graphite_min_max_sampled, &rtpe_gauge_graphite_min_max,
			&rtpe_stats_gauge);

	stats_sampled_calc_diff(&rtpe_stats_sampled, &rtpe_sampled_graphite_min_max_intv,
			&rtpe_sampled_graphite_min_max_diff);
	stats_sampled_min_max_sample(&rtpe_sampled_graphite_min_max, &rtpe_sampled_graphite_min_max_sampled);
	stats_sampled_avg(&rtpe_sampled_graphite_avg, &rtpe_sampled_graphite_min_max_diff);

	GString *graph_str = g_string_new("");

#define GPF(fmt, ...) \
	if (graphite_prefix) \
		g_string_append(graph_str, graphite_prefix); \
	g_string_append_printf(graph_str, fmt " %llu\n", ##__VA_ARGS__, (unsigned long long)rtpe_now.tv_sec)

	for (int i = 0; i < NGC_COUNT; i++) {
		GPF("%s_time_min %.6f", ng_command_strings[i],
				(double) atomic64_get(&rtpe_sampled_graphite_min_max_sampled.min.ng_command_times[i]) / 1000000.0);
		GPF("%s_time_max %.6f", ng_command_strings[i],
				(double) atomic64_get(&rtpe_sampled_graphite_min_max_sampled.max.ng_command_times[i]) / 1000000.0);
		GPF("%s_time_avg %.6f", ng_command_strings[i],
				(double) atomic64_get(&rtpe_sampled_graphite_avg.avg.ng_command_times[i]) / 1000000.0);

		GPF("%ss_ps_min " UINT64F, ng_command_strings[i], atomic64_get(&rtpe_rate_graphite_min_max_avg_sampled.min.ng_commands[i]));
		GPF("%ss_ps_max " UINT64F, ng_command_strings[i], atomic64_get(&rtpe_rate_graphite_min_max_avg_sampled.max.ng_commands[i]));
		GPF("%ss_ps_avg " UINT64F, ng_command_strings[i], atomic64_get(&rtpe_rate_graphite_min_max_avg_sampled.avg.ng_commands[i]));

		ilog(LOG_DEBUG, "Min/Max/Avg %s processing delay: %.6f/%.6f/%.6f sec",
			ng_command_strings[i],
			(double) atomic64_get(&rtpe_sampled_graphite_min_max_sampled.min.ng_command_times[i]) / 1000000.0,
			(double) atomic64_get(&rtpe_sampled_graphite_min_max_sampled.max.ng_command_times[i]) / 1000000.0,
			(double) atomic64_get(&rtpe_sampled_graphite_avg.avg.ng_command_times[i]) / 1000000.0);

		GPF("%s_count %" PRIu64, ng_command_strings[i], atomic64_get(&rtpe_stats.ng_commands[i]));
	}

	GPF("call_dur %.6f", (double) atomic64_get_na(&rtpe_stats_graphite_diff.total_calls_duration_intv) / 1000000.0);
	struct timeval avg_duration;
	uint64_t managed_sess = atomic64_get_na(&rtpe_stats_graphite_diff.managed_sess);
	if (managed_sess)
		timeval_from_us(&avg_duration, atomic64_get_na(&rtpe_stats_graphite_diff.call_duration) / managed_sess);
	else
		avg_duration = (struct timeval) {0,0};
	GPF("average_call_dur %llu.%06llu",(unsigned long long)avg_duration.tv_sec,(unsigned long long)avg_duration.tv_usec);
	GPF("forced_term_sess "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.forced_term_sess));
	GPF("managed_sess "UINT64F, atomic64_get(&rtpe_stats.managed_sess));
	GPF("managed_sess_min "UINT64F, atomic64_get_na(&rtpe_gauge_graphite_min_max_sampled.min.total_sessions));
	GPF("managed_sess_max "UINT64F, atomic64_get_na(&rtpe_gauge_graphite_min_max_sampled.max.total_sessions));
	GPF("current_sessions_total "UINT64F, atomic64_get(&rtpe_stats_gauge.total_sessions));
	GPF("current_sessions_own "UINT64F, atomic64_get(&rtpe_stats_gauge.total_sessions) - atomic64_get(&rtpe_stats_gauge.foreign_sessions));
	GPF("current_sessions_foreign "UINT64F, atomic64_get(&rtpe_stats_gauge.foreign_sessions));
	GPF("current_transcoded_media "UINT64F, atomic64_get(&rtpe_stats_gauge.transcoded_media));
	GPF("current_sessions_ipv4 "UINT64F, atomic64_get(&rtpe_stats_gauge.ipv4_sessions));
	GPF("current_sessions_ipv6 "UINT64F, atomic64_get(&rtpe_stats_gauge.ipv6_sessions));
	GPF("current_sessions_mixed "UINT64F, atomic64_get(&rtpe_stats_gauge.mixed_sessions));
	GPF("nopacket_relayed_sess "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.nopacket_relayed_sess));
	GPF("oneway_stream_sess "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.oneway_stream_sess));
	GPF("regular_term_sess "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.regular_term_sess));
	GPF("relayed_errors_user "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.errors_user));
	GPF("relayed_packets_user "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.packets_user));
	GPF("relayed_bytes_user "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.bytes_user));
	GPF("relayed_errors_kernel "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.errors_kernel));
	GPF("relayed_packets_kernel "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.packets_kernel));
	GPF("relayed_bytes_kernel "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.bytes_kernel));
	GPF("relayed_errors "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.errors_user) +
			atomic64_get_na(&rtpe_stats_graphite_diff.errors_kernel));
	GPF("relayed_packets "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.packets_user) +
			atomic64_get_na(&rtpe_stats_graphite_diff.packets_kernel));
	GPF("relayed_bytes "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.bytes_user) +
			atomic64_get_na(&rtpe_stats_graphite_diff.bytes_kernel));
	GPF("silent_timeout_sess "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.silent_timeout_sess));
	GPF("final_timeout_sess "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.final_timeout_sess));
	GPF("offer_timeout_sess "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.offer_timeout_sess));
	GPF("timeout_sess "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.timeout_sess));
	GPF("reject_sess "UINT64F, atomic64_get_na(&rtpe_stats_graphite_diff.rejected_sess));

	for (GList *l = all_local_interfaces.head; l; l = l->next) {
		struct local_intf *lif = l->data;
		// only show first-order interface entries: socket families must match
		if (lif->logical->preferred_family != lif->spec->local_address.addr.family)
			continue;
		int num_ports = lif->spec->port_pool.max - lif->spec->port_pool.min + 1;
		GPF("ports_free_%s_%s %i", lif->logical->name.s,
				sockaddr_print_buf(&lif->spec->local_address.addr),
				g_hash_table_size(lif->spec->port_pool.free_ports_ht));
		GPF("ports_used_%s_%s %i", lif->logical->name.s,
				sockaddr_print_buf(&lif->spec->local_address.addr),
				num_ports - g_hash_table_size(lif->spec->port_pool.free_ports_ht));
	}

	mutex_lock(&rtpe_codec_stats_lock);

	GList *chains = g_hash_table_get_keys(rtpe_codec_stats);
	int last_tv_sec = rtpe_now.tv_sec - 1;
	unsigned int idx = last_tv_sec & 1;
	for (GList *l = chains; l; l = l->next) {
		char *chain = l->data;
		struct codec_stats *stats_entry = g_hash_table_lookup(rtpe_codec_stats, chain);
		GPF("transcoder_%s %i", stats_entry->chain_brief,
				g_atomic_int_get(&stats_entry->num_transcoders));
		if (g_atomic_int_get(&stats_entry->last_tv_sec[idx]) != last_tv_sec)
			continue;
		GPF("transcoder_%s_packets %llu", stats_entry->chain_brief,
				(unsigned long long) atomic64_get(&stats_entry->packets_input[idx]));
		GPF("transcoder_%s_bytes %llu", stats_entry->chain_brief,
				(unsigned long long) atomic64_get(&stats_entry->bytes_input[idx]));
		GPF("transcoder_%s_samples %llu", stats_entry->chain_brief,
				(unsigned long long) atomic64_get(&stats_entry->pcm_samples[idx]));
	}

	mutex_unlock(&rtpe_codec_stats_lock);

	g_list_free(chains);


	ilog(LOG_DEBUG, "min_sessions:%llu max_sessions:%llu, call_dur_per_interval:%.6f at time %llu\n",
			(unsigned long long) atomic64_get_na(&rtpe_gauge_graphite_min_max_sampled.min.total_sessions),
			(unsigned long long) atomic64_get_na(&rtpe_gauge_graphite_min_max_sampled.max.total_sessions),
			(double) atomic64_get_na(&rtpe_stats_graphite_diff.total_calls_duration_intv) / 1000000.0,
			(unsigned long long ) rtpe_now.tv_sec);

	return graph_str;
}

static int send_graphite_data(void) {

	if (graphite_sock.fd < 0) {
		ilog(LOG_ERROR,"Graphite socket is not connected.");
		return -1;
	}

	GString *graph_str = print_graphite_data();

	size_t sent = 0;
	int blockings = 10; // let it block that many times
	while (sent < graph_str->len) {
		int rc = write(graphite_sock.fd, graph_str->str + sent, graph_str->len - sent);
		if (rc<0) {
			if (blockings <= 0 || (errno != EWOULDBLOCK && errno != EAGAIN && errno != EINTR)) {
				ilog(LOG_ERROR,"Could not write to graphite socket (%s). " \
						"Disconnecting graphite server.", strerror(errno));
				goto error;
			}
			rc = 0;
		}
		if (rc == 0) {
			// poor man's blocking handling
			blockings--;
			usleep(500000);
			continue;
		}
		sent += rc;
	}

	g_string_free(graph_str, TRUE);
	return 0;

error:
	g_string_free(graph_str, TRUE);
	close_socket(&graphite_sock);
	return -1;
}


static void graphite_loop_run(endpoint_t *graphite_ep, int seconds) {

	int rc=0;
	struct pollfd wfds[1];

        if (!graphite_ep) {
                ilog(LOG_ERROR, "NULL graphite_ep");
                return ;
        }

	if (connection_state == STATE_IN_PROGRESS && graphite_sock.fd >= 0) {
		wfds[0].fd=graphite_sock.fd;
		wfds[0].events = POLLOUT | POLLERR | POLLHUP | POLLNVAL;

		rc = poll(wfds,1,1000);
		if (rc == -1) {
			ilog(LOG_ERROR,"Error on the socket.");
			close_socket(&graphite_sock);
			connection_state = STATE_DISCONNECTED;
			return;
		} else if (rc==0) {
			// timeout
			return;
		} else {
			if (!(wfds[0].revents & POLLOUT)) {
				ilog(LOG_WARN,"fd is active but not ready for writing, poll events=%x",wfds[0].revents);
				close_socket(&graphite_sock);
				connection_state = STATE_DISCONNECTED;
				return;
			}
			rc = socket_error(&graphite_sock);
			if (rc < 0) ilog(LOG_ERROR,"getsockopt failure.");
			if (rc != 0) {
				ilog(LOG_ERROR,"Socket connect failed. fd: %i, Reason: %s\n",graphite_sock.fd, strerror(rc));
				close_socket(&graphite_sock);
				connection_state = STATE_DISCONNECTED;
				return;
			}
			ilog(LOG_INFO, "Graphite server connected.");
			connection_state = STATE_CONNECTED;
			next_run=0; // fake next run to skip sleep after reconnect
		}
	}

	gettimeofday(&rtpe_now, NULL);
	if (rtpe_now.tv_sec < next_run) {
		usleep(100000);
		return;
	}

	next_run = rtpe_now.tv_sec + seconds;

	if (graphite_sock.fd < 0 && connection_state == STATE_DISCONNECTED) {
		connect_to_graphite_server(graphite_ep);
	}

	if (graphite_sock.fd >= 0 && connection_state == STATE_CONNECTED) {
		add_total_calls_duration_in_interval(&graphite_interval_tv);

		gettimeofday(&rtpe_now, NULL);
		rc = send_graphite_data();
		if (rc < 0) {
			ilog(LOG_ERROR,"Sending graphite data failed.");
			close_socket(&graphite_sock);
			connection_state = STATE_DISCONNECTED;
		}
	}

}

void graphite_loop(void *d) {
	if (rtpe_config.graphite_interval <= 0) {
		ilog(LOG_WARNING,"Graphite send interval was not set. Setting it to 1 second.");
		rtpe_config.graphite_interval=1;
	}

	connect_to_graphite_server(&rtpe_config.graphite_ep);

	while (!rtpe_shutdown)
		graphite_loop_run(&rtpe_config.graphite_ep, rtpe_config.graphite_interval); // time in seconds
}
