/*
 * odissey.
 *
 * PostgreSQL connection pooler and request router.
*/

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

#include <machinarium.h>
#include <soprano.h>

#include "od_macro.h"
#include "od_list.h"
#include "od_pid.h"
#include "od_syslog.h"
#include "od_log.h"
#include "od_scheme.h"
#include "od_lex.h"
#include "od_config.h"
#include "od_stat.h"
#include "od_server.h"
#include "od_server_pool.h"
#include "od_client.h"
#include "od_client_list.h"
#include "od_client_pool.h"
#include "od_route_id.h"
#include "od_route.h"
#include "od_route_pool.h"
#include "od.h"
#include "od_io.h"
#include "od_pooler.h"
#include "od_fe.h"
#include "od_tls.h"

void od_feclose(od_client_t *client)
{
	od_pooler_t *pooler = client->pooler;
	if (client->route) {
		od_route_t *route = client->route;
		od_clientpool_set(&route->client_pool, client, OD_CUNDEF);
		client->route = NULL;
	}
	if (client->io) {
		machine_close(client->io);
		machine_free_io(client->io);
		client->io = NULL;
	}
	od_clientlist_unlink(&pooler->client_list, client);
	od_clientfree(client);
}

int od_feerror(od_client_t *client, char *fmt, ...)
{
	od_pooler_t *pooler = client->pooler;

	char message[512];
	va_list args;
	va_start(args, fmt);
	int len;
	len = vsnprintf(message, sizeof(message), fmt, args);
	va_end(args);

	od_error(&pooler->od->log, client->io, "C: %s", message);

	so_stream_t *stream = &client->stream;
	so_stream_reset(stream);
	int rc;
	rc = so_bewrite_error(stream, message, len);
	if (rc == -1)
		return -1;
	rc = od_write(client->io, stream);
	return rc;
}

static int
od_festartup_read(od_client_t *client)
{
	od_pooler_t *pooler = client->pooler;
	so_stream_t *stream = &client->stream;
	so_stream_reset(stream);
	for (;;) {
		uint32_t pos_size = so_stream_used(stream);
		uint8_t *pos_data = stream->s;
		uint32_t len;
		int to_read;
		to_read = so_read_startup(&len, &pos_data, &pos_size);
		if (to_read == 0)
			break;
		if (to_read == -1) {
			od_error(&pooler->od->log, client->io,
			         "C (startup): bad startup packet");
			return -1;
		}
		int rc = so_stream_ensure(stream, to_read);
		if (rc == -1)
			return -1;
		rc = machine_read(client->io, (char*)stream->p, to_read, INT_MAX);
		if (rc < 0) {
			od_error(&pooler->od->log, client->io,
			         "C (startup): read error: %s",
			         machine_error(client->io));
			return -1;
		}
		so_stream_advance(stream, to_read);
	}
	return 0;
}

int od_festartup(od_client_t *client)
{
	od_pooler_t *pooler = client->pooler;
	int rc;
	rc = od_festartup_read(client);
	if (rc == -1)
		return -1;
	so_stream_t *stream = &client->stream;
	rc = so_beread_startup(&client->startup,
	                       stream->s,
	                       so_stream_used(stream));
	if (rc == -1)
		return -1;

	/* client ssl request */
	rc = od_tlsfe_accept(pooler->env, client->io, pooler->tls,
	                     &client->stream,
	                     &pooler->od->log, "C",
	                     &pooler->od->scheme,
	                     &client->startup);
	if (rc == -1)
		return -1;

	if (! client->startup.is_ssl_request)
		return 0;

	/* read startup-cancel message followed after ssl
	 * negotiation */
	assert(client->startup.is_ssl_request);
	rc = od_festartup_read(client);
	if (rc == -1)
		return -1;
	rc = so_beread_startup(&client->startup,
	                       stream->s,
	                       so_stream_used(stream));
	if (rc == -1)
		return -1;
	return 0;
}

int od_fekey(od_client_t *client)
{
	client->key.key_pid = client->id;
	client->key.key = 1 + rand();
	return 0;
}

int od_fesetup(od_client_t *client)
{
	od_pooler_t *pooler = client->pooler;
	so_stream_t *stream = &client->stream;
	so_stream_reset(stream);
	int rc;
	rc = so_bewrite_backend_key_data(stream, client->key.key_pid,
	                                 client->key.key);
	if (rc == -1)
		return -1;
	rc = so_bewrite_parameter_status(stream, "", 1, "", 1);
	if (rc == -1)
		return -1;
	rc = od_write(client->io, stream);
	if (rc == -1) {
		od_error(&pooler->od->log, client->io, "C (setup): write error: %s",
		         machine_error(client->io));
		return -1;
	}
	return 0;
}

int od_feready(od_client_t *client)
{
	od_pooler_t *pooler = client->pooler;
	so_stream_t *stream = &client->stream;
	so_stream_reset(stream);
	int rc;
	rc = so_bewrite_ready(stream, 'I');
	if (rc == -1)
		return -1;
	rc = od_write(client->io, stream);
	if (rc == -1) {
		od_error(&pooler->od->log, client->io, "C: write error: %s",
		         machine_error(client->io));
		return -1;
	}
	return 0;
}