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/* Icecast
 *
 * This program is distributed under the GNU General Public License, version 2.
 * A copy of this license is included with this source.
 *
 * Copyright 2000-2004, Jack Moffitt <jack@xiph.org, 
 *                      Michael Smith <msmith@xiph.org>,
 *                      oddsock <oddsock@xiph.org>,
 *                      Karl Heyes <karl@xiph.org>
 *                      and others (see AUTHORS for details).
 */

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/* -*- c-basic-offset: 4; indent-tabs-mode: nil; -*- */
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/* slave.c
 * by Ciaran Anscomb <ciaran.anscomb@6809.org.uk>
 *
 * Periodically requests a list of streams from a master server
 * and creates source threads for any it doesn't already have.
 * */

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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>

#ifndef _WIN32
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#else
#include <winsock2.h>
#define snprintf _snprintf
#define strcasecmp stricmp
#define strncasecmp strnicmp
#endif

#include "os.h"

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#include "thread/thread.h"
#include "avl/avl.h"
#include "net/sock.h"
#include "httpp/httpp.h"
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#include "cfgfile.h"
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#include "global.h"
#include "util.h"
#include "connection.h"
#include "refbuf.h"
#include "client.h"
#include "stats.h"
#include "logging.h"
#include "source.h"
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#include "format.h"
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#define CATMODULE "slave"

static void *_slave_thread(void *arg);
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static thread_type *_slave_thread_id;
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static int slave_running = 0;
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static int update_settings = 0;
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volatile static unsigned int max_interval = 0;
volatile static int rescan_relays = 0;
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relay_server *relay_free (relay_server *relay)
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{
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    relay_server *next = relay->next;
    DEBUG1("freeing relay %s", relay->localmount);
    if (relay->source)
       source_free_source (relay->source);
    xmlFree (relay->server);
    xmlFree (relay->mount);
    xmlFree (relay->localmount);
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    if (relay->username)
        xmlFree (relay->username);
    if (relay->password)
        xmlFree (relay->password);
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    free (relay);
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    return next;
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}

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relay_server *relay_copy (relay_server *r)
{
    relay_server *copy = calloc (1, sizeof (relay_server));
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    if (copy)
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    {
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        copy->server = xmlStrdup (r->server);
        copy->mount = xmlStrdup (r->mount);
        copy->localmount = xmlStrdup (r->localmount);
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        if (r->username)
            copy->username = xmlStrdup (r->username);
        if (r->password)
            copy->password = xmlStrdup (r->password);
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        copy->port = r->port;
        copy->mp3metadata = r->mp3metadata;
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        copy->on_demand = r->on_demand;
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    }
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    return copy;
}
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/* force a recheck of the relays. This will recheck the master server if
 * a this is a slave.
 */
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void slave_recheck_mounts (void)
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{
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    max_interval = 0;
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    update_settings = 1;
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}

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/* Request slave thread to rescan the existing relays to see if any need
 * starting up, eg on-demand relays
 */
void slave_rescan (void)
{
    rescan_relays = 1;
}


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/* Request slave thread to check the relay list for changes and to
 * update the stats for the current streams.
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 */
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void slave_rebuild_mounts (void)
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{
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    update_settings = 1;
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    rescan_relays = 1;
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}

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void slave_initialize(void)
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{
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    if (slave_running)
        return;
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    slave_running = 1;
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    max_interval = 0;
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    _slave_thread_id = thread_create("Slave Thread", _slave_thread, NULL, THREAD_ATTACHED);
}
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void slave_shutdown(void)
{
    if (!slave_running)
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        return;
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    slave_running = 0;
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    DEBUG0 ("waiting for slave thread");
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    thread_join (_slave_thread_id);
}


/* This does the actual connection for a relay. A thread is
 * started off if a connection can be acquired
 */
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static void *start_relay_stream (void *arg)
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{
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    relay_server *relay = arg;
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    sock_t streamsock = SOCK_ERROR;
    source_t *src = relay->source;
    http_parser_t *parser = NULL;
    connection_t *con=NULL;
    char header[4096];

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    relay->running = 1;
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    INFO1("Starting relayed source at mountpoint \"%s\"", relay->localmount);
    do
    {
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        char *auth_header;

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        streamsock = sock_connect_wto (relay->server, relay->port, 30);
        if (streamsock == SOCK_ERROR)
        {
            WARN3("Failed to relay stream from master server, couldn't connect to http://%s:%d%s",
                    relay->server, relay->port, relay->mount);
            break;
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        }
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        con = create_connection (streamsock, -1, NULL);

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        if (relay->username && relay->password)
        {
            char *esc_authorisation;
            unsigned len = strlen(relay->username) + strlen(relay->password) + 2;

            auth_header = malloc (len);
            snprintf (auth_header, len, "%s:%s", relay->username, relay->password);
            esc_authorisation = util_base64_encode(auth_header);
            free(auth_header);
            len = strlen (esc_authorisation) + 24;
            auth_header = malloc (len);
            snprintf (auth_header, len,
                    "Authorization: Basic %s\r\n", esc_authorisation);
            free(esc_authorisation);
        }
        else
        {
            auth_header = strdup ("");
        }

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        /* At this point we may not know if we are relaying an mp3 or vorbis
         * stream, but only send the icy-metadata header if the relay details
         * state so (the typical case).  It's harmless in the vorbis case. If
         * we don't send in this header then relay will not have mp3 metadata.
         */
        sock_write(streamsock, "GET %s HTTP/1.0\r\n"
                "User-Agent: " ICECAST_VERSION_STRING "\r\n"
                "%s"
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                "%s"
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                "\r\n",
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                relay->mount,
                relay->mp3metadata?"Icy-MetaData: 1\r\n":"",
                auth_header);
        free (auth_header);
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        memset (header, 0, sizeof(header));
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        if (util_read_header (con->sock, header, 4096, READ_ENTIRE_HEADER) == 0)
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        {
            WARN0("Header read failed");
            break;
        }
        parser = httpp_create_parser();
        httpp_initialize (parser, NULL);
        if (! httpp_parse_response (parser, header, strlen(header), relay->localmount))
        {
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            ERROR0("Error parsing relay request");
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            break;
        }
        if (httpp_getvar (parser, HTTPP_VAR_ERROR_MESSAGE))
        {
            ERROR1("Error from relay request: %s", httpp_getvar(parser, HTTPP_VAR_ERROR_MESSAGE));
            break;
        }
        src->parser = parser;
        src->con = con;
        if (connection_complete_source (src) < 0)
        {
            DEBUG0("Failed to complete source initialisation");
            break;
        }
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        stats_event_inc(NULL, "source_relay_connections");
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        source_main (relay->source);

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        if (relay->on_demand == 0)
        {
            /* only keep refreshing YP entries for inactive on-demand relays */
            yp_remove (relay->localmount);
            relay->source->yp_public = -1;
        }

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        /* initiate an immediate relay cleanup run */
        relay->cleanup = 1;
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        rescan_relays = 1;
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        return NULL;
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    } while (0);

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    DEBUG1 ("failed relay, fallback to %s", relay->source->fallback_mount);
    if (relay->source->fallback_mount)
    {
        source_t *fallback_source;

        avl_tree_rlock(global.source_tree);
        fallback_source = source_find_mount (relay->source->fallback_mount);

        if (fallback_source != NULL)
            source_move_clients (relay->source, fallback_source);

        avl_tree_unlock (global.source_tree);
    }

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    if (con == NULL && streamsock != SOCK_ERROR)
        sock_close (streamsock);
    if (con)
        connection_close (con);
    src->con = NULL;
    if (parser)
        httpp_destroy (parser);
    src->parser = NULL;
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    source_clear_source (relay->source);
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    /* initiate an immediate relay cleanup run */
    relay->cleanup = 1;
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    rescan_relays = 1;
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    return NULL;
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}


/* wrapper for starting the provided relay stream */
static void check_relay_stream (relay_server *relay)
{
    if (relay->source == NULL)
    {
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        if (relay->localmount[0] != '/')
        {
            WARN1 ("relay mountpoint \"%s\" does not start with /, skipping",
                    relay->localmount);
            return;
        }
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        /* new relay, reserve the name */
        relay->source = source_reserve (relay->localmount);
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        if (relay->source)
            DEBUG1("Adding relay source at mountpoint \"%s\"", relay->localmount);
        else
            WARN1 ("new relay but source \"%s\" already exists", relay->localmount);
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    }
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    do
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    {
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        source_t *source = relay->source;
        if (relay->source == NULL || relay->running)
            break;
        if (relay->on_demand)
        {
            ice_config_t *config = config_get_config ();
            mount_proxy *mountinfo = config_find_mount (config, relay->localmount);

            if (mountinfo == NULL)
                source_update_settings (config, relay->source, mountinfo);
            config_release_config ();
            slave_rebuild_mounts();
            stats_event (relay->localmount, "listeners", "0");
            relay->source->on_demand = relay->on_demand;

            if (source->fallback_mount && source->fallback_override)
            {
                source_t *fallback;
                DEBUG1 ("checking %s for fallback override", source->fallback_mount);
                avl_tree_rlock (global.source_tree);
                fallback = source_find_mount (source->fallback_mount);
                if (fallback && fallback->running && fallback->listeners)
                {
                   DEBUG2 ("fallback running %d with %lu listeners", fallback->running, fallback->listeners);
                   source->on_demand_req = 1;
                }
                avl_tree_unlock (global.source_tree);
            }
            if (source->on_demand_req == 0)
                break;
        }

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        relay->thread = thread_create ("Relay Thread", start_relay_stream,
                relay, THREAD_ATTACHED);
        return;
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    } while(0);
    /* the relay thread may of shut down itself */
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    if (relay->cleanup && relay->thread)
    {
        DEBUG1 ("waiting for relay thread for \"%s\"", relay->localmount);
        thread_join (relay->thread);
        relay->thread = NULL;
        relay->cleanup = 0;
        relay->running = 0;
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        if (relay->on_demand)
        {
            ice_config_t *config = config_get_config ();
            mount_proxy *mountinfo = config_find_mount (config, relay->localmount);
            source_update_settings (config, relay->source, mountinfo);
            config_release_config ();
            stats_event (relay->localmount, "listeners", "0");
        }
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    }
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}

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/* compare the 2 relays to see if there are any changes, return 1 if
 * the relay needs to be restarted, 0 otherwise
 */
static int relay_has_changed (relay_server *new, relay_server *old)
{
    do
    {
        if (strcmp (new->mount, old->mount) != 0)
            break;
        if (strcmp (new->server, old->server) != 0)
            break;
        if (new->port != old->port)
            break;
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        if (new->mp3metadata != old->mp3metadata)
            break;
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        if (new->on_demand != old->on_demand)
            old->on_demand = new->on_demand;
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        return 0;
    } while (0);
    return 1;
}


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/* go through updated looking for relays that are different configured. The
 * returned list contains relays that should be kept running, current contains
 * the list of relays to shutdown
 */
static relay_server *
update_relay_set (relay_server **current, relay_server *updated)
{
    relay_server *relay = updated;
    relay_server *existing_relay, **existing_p;
    relay_server *new_list = NULL;

    while (relay)
    {
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        existing_relay = *current;
        existing_p = current;

        while (existing_relay)
        {
            /* break out if keeping relay */
            if (strcmp (relay->localmount, existing_relay->localmount) == 0)
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                if (relay_has_changed (relay, existing_relay) == 0)
                    break;
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            existing_p = &existing_relay->next;
            existing_relay = existing_relay->next;
        }
        if (existing_relay == NULL)
        {
            /* new one, copy and insert */
            existing_relay = relay_copy (relay);
        }
        else
        {
            *existing_p = existing_relay->next;
        }
        existing_relay->next = new_list;
        new_list = existing_relay;
        relay = relay->next;
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    }
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    return new_list;
}


/* update the relay_list with entries from new_relay_list. Any new relays
 * are added to the list, and any not listed in the provided new_relay_list
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 * are separated and returned in a separate list
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 */
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static relay_server *
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update_relays (relay_server **relay_list, relay_server *new_relay_list)
{
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    relay_server *active_relays, *cleanup_relays;
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    active_relays = update_relay_set (relay_list, new_relay_list);
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    cleanup_relays = *relay_list;
    /* re-assign new set */
    *relay_list = active_relays;

    return cleanup_relays;
}


static void relay_check_streams (relay_server *to_start, relay_server *to_free)
{
    relay_server *relay;

    while (to_free)
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    {
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        if (to_free->source)
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        {
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            if (to_free->running)
            {
                /* relay has been removed from xml, shut down active relay */
                DEBUG1 ("source shutdown request on \"%s\"", to_free->localmount);
                to_free->source->running = 0;
                thread_join (to_free->thread);
                slave_rebuild_mounts();
            }
            else
                stats_event (to_free->localmount, NULL, NULL);
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        }
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        to_free = relay_free (to_free);
    }

    relay = to_start;
    while (relay)
    {
        check_relay_stream (relay);
        relay = relay->next;
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    }
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}

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static int update_from_master(ice_config_t *config)
{
    char *master = NULL, *password = NULL, *username= NULL;
    int port;
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    sock_t mastersock;
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    int ret = 0;
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    char buf[256];
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    do
    {
        char *authheader, *data;
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        relay_server *new_relays = NULL, *cleanup_relays;
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        int len, count = 1;
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        int on_demand;
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        username = strdup (config->master_username);
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        if (config->master_password)
            password = strdup (config->master_password);
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        if (config->master_server)
            master = strdup (config->master_server);
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        port = config->master_server_port;
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        if (password == NULL || master == NULL || port == 0)
            break;
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        on_demand = config->on_demand;
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        ret = 1;
        config_release_config();
        mastersock = sock_connect_wto (master, port, 0);
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        if (mastersock == SOCK_ERROR)
        {
            WARN0("Relay slave failed to contact master server to fetch stream list");
            break;
        }
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        len = strlen(username) + strlen(password) + 2;
        authheader = malloc(len);
        snprintf (authheader, len, "%s:%s", username, password);
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        data = util_base64_encode(authheader);
        sock_write (mastersock,
                "GET /admin/streamlist.txt HTTP/1.0\r\n"
                "Authorization: Basic %s\r\n"
                "\r\n", data);
        free(authheader);
        free(data);

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        if (sock_read_line(mastersock, buf, sizeof(buf)) == 0 ||
                strncmp (buf, "HTTP/1.0 200", 12) != 0)
        {
            sock_close (mastersock);
            WARN0 ("Master rejected streamlist request");
            break;
        }

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        while (sock_read_line(mastersock, buf, sizeof(buf)))
        {
            if (!strlen(buf))
                break;
        }
        while (sock_read_line(mastersock, buf, sizeof(buf)))
        {
            relay_server *r;
            if (!strlen(buf))
                continue;
            DEBUG2 ("read %d from master \"%s\"", count++, buf);
            r = calloc (1, sizeof (relay_server));
            if (r)
            {
                r->server = xmlStrdup (master);
                r->port = port;
                r->mount = xmlStrdup (buf);
                r->localmount = xmlStrdup (buf);
                r->mp3metadata = 1;
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                r->on_demand = on_demand;
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                r->next = new_relays;
                new_relays = r;
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            }
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        }
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        sock_close (mastersock);

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        thread_mutex_lock (&(config_locks()->relay_lock));
        cleanup_relays = update_relays (&global.master_relays, new_relays);
        
        relay_check_streams (global.master_relays, cleanup_relays);
        relay_check_streams (NULL, new_relays);

        thread_mutex_unlock (&(config_locks()->relay_lock));

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    } while(0);

    if (master)
        free (master);
    if (username)
        free (username);
    if (password)
        free (password);

    return ret;
}


static void *_slave_thread(void *arg)
{
    ice_config_t *config;
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    unsigned int interval = 0;
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    source_recheck_mounts();

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    while (1)
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    {
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        relay_server *cleanup_relays;

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        thread_sleep (1000000);
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        if (slave_running == 0)
            break;
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        if (rescan_relays == 0 && max_interval > ++interval)
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            continue;

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        /* only update relays lists when required */
        if (max_interval <= interval)
        {
            DEBUG0 ("checking master stream list");
            config = config_get_config();
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            interval = 0;
            max_interval = config->master_update_interval;
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            /* the connection could take some time, so the lock can drop */
            if (update_from_master (config))
                config = config_get_config();
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            thread_mutex_lock (&(config_locks()->relay_lock));
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            cleanup_relays = update_relays (&global.relays, config->relay);
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            config_release_config();
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            relay_check_streams (global.relays, cleanup_relays);
            thread_mutex_unlock (&(config_locks()->relay_lock));
        }
        else
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        {
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            DEBUG0 ("rescanning relay lists");
            thread_mutex_lock (&(config_locks()->relay_lock));
            relay_check_streams (global.master_relays, NULL);
            relay_check_streams (global.relays, NULL);
            thread_mutex_unlock (&(config_locks()->relay_lock));
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        }
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        rescan_relays = 0;
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        if (update_settings)
        {
            update_settings = 0;
            source_recheck_mounts();
        }
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    }
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    DEBUG0 ("shutting down current relays");
    relay_check_streams (NULL, global.relays);
    relay_check_streams (NULL, global.master_relays);

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    INFO0 ("Slave thread shutdown complete");

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    return NULL;
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}
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