/*
The MIT License (MIT)

Copyright (c) 2013-2015 SRS(ossrs)

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#include <srs_app_http_stream.hpp>

#define SRS_STREAM_CACHE_CYCLE_SECONDS 30

#if defined(SRS_AUTO_HTTP_CORE)

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>

#include <sstream>
using namespace std;

#include <srs_protocol_buffer.hpp>
#include <srs_rtmp_utility.hpp>
#include <srs_kernel_log.hpp>
#include <srs_kernel_error.hpp>
#include <srs_app_st.hpp>
#include <srs_core_autofree.hpp>
#include <srs_app_config.hpp>
#include <srs_kernel_utility.hpp>
#include <srs_kernel_file.hpp>
#include <srs_kernel_flv.hpp>
#include <srs_rtmp_stack.hpp>
#include <srs_app_source.hpp>
#include <srs_rtmp_msg_array.hpp>
#include <srs_kernel_aac.hpp>
#include <srs_kernel_mp3.hpp>
#include <srs_kernel_ts.hpp>
#include <srs_app_pithy_print.hpp>
#include <srs_app_source.hpp>
#include <srs_app_server.hpp>

#endif

#ifdef SRS_AUTO_HTTP_SERVER

SrsStreamCache::SrsStreamCache(SrsSource* s, SrsRequest* r)
{
    req = r->copy();
    source = s;
    queue = new SrsMessageQueue(true);
    pthread = new SrsEndlessThread("http-stream", this);
    
    // TODO: FIXME: support reload.
    fast_cache = _srs_config->get_vhost_http_remux_fast_cache(req->vhost);
}

SrsStreamCache::~SrsStreamCache()
{
    srs_freep(pthread);
    
    srs_freep(queue);
    srs_freep(req);
}

int SrsStreamCache::update(SrsSource* s, SrsRequest* r)
{
    int ret = ERROR_SUCCESS;

    srs_freep(req);
    req = r->copy();
    source = s;
    
    return ret;
}

int SrsStreamCache::start()
{
    return pthread->start();
}

int SrsStreamCache::dump_cache(SrsConsumer* consumer, SrsRtmpJitterAlgorithm jitter)
{
    int ret = ERROR_SUCCESS;

    if (fast_cache <= 0) {
        srs_info("http: ignore dump fast cache.");
        return ret;
    }
    
    // the jitter is get from SrsSource, which means the time_jitter of vhost.
    if ((ret = queue->dump_packets(consumer, false, jitter)) != ERROR_SUCCESS) {
        return ret;
    }
    
    srs_trace("http: dump cache %d msgs, duration=%dms, cache=%.2fs", 
        queue->size(), queue->duration(), fast_cache);
    
    return ret;
}

int SrsStreamCache::cycle()
{
    int ret = ERROR_SUCCESS;
    
    // TODO: FIXME: support reload.
    if (fast_cache <= 0) {
        st_sleep(SRS_STREAM_CACHE_CYCLE_SECONDS);
        return ret;
    }
    
    // the stream cache will create consumer to cache stream,
    // which will trigger to fetch stream from origin for edge.
    SrsConsumer* consumer = NULL;
    if ((ret = source->create_consumer(NULL, consumer, false, false, true)) != ERROR_SUCCESS) {
        srs_error("http: create consumer failed. ret=%d", ret);
        return ret;
    }
    SrsAutoFree(SrsConsumer, consumer);

    SrsPithyPrint* pprint = SrsPithyPrint::create_http_stream_cache();
    SrsAutoFree(SrsPithyPrint, pprint);
    
    SrsMessageArray msgs(SRS_PERF_MW_MSGS);

    // set the queue size, which used for max cache.
    // TODO: FIXME: support reload.
    queue->set_queue_size(fast_cache);
    
    while (true) {
        pprint->elapse();

        // get messages from consumer.
        // each msg in msgs.msgs must be free, for the SrsMessageArray never free them.
        int count = 0;
        if ((ret = consumer->dump_packets(&msgs, count)) != ERROR_SUCCESS) {
            srs_error("http: get messages from consumer failed. ret=%d", ret);
            return ret;
        }
        
        if (count <= 0) {
            srs_info("http: sleep %dms for no msg", SRS_CONSTS_RTMP_PULSE_TIMEOUT_US);
            // directly use sleep, donot use consumer wait.
            st_usleep(SRS_CONSTS_RTMP_PULSE_TIMEOUT_US);
            
            // ignore when nothing got.
            continue;
        }

        if (pprint->can_print()) {
            srs_trace("-> "SRS_CONSTS_LOG_HTTP_STREAM_CACHE" http: got %d msgs, age=%d, min=%d, mw=%d", 
                count, pprint->age(), SRS_PERF_MW_MIN_MSGS, SRS_CONSTS_RTMP_PULSE_TIMEOUT_US / 1000);
        }
    
        // free the messages.
        for (int i = 0; i < count; i++) {
            SrsSharedPtrMessage* msg = msgs.msgs[i];
            queue->enqueue(msg);
        }
    }
    
    return ret;
}

ISrsStreamEncoder::ISrsStreamEncoder()
{
}

ISrsStreamEncoder::~ISrsStreamEncoder()
{
}

SrsTsStreamEncoder::SrsTsStreamEncoder()
{
    enc = new SrsTsEncoder();
}

SrsTsStreamEncoder::~SrsTsStreamEncoder()
{
    srs_freep(enc);
}

int SrsTsStreamEncoder::initialize(SrsFileWriter* w, SrsStreamCache* /*c*/)
{
    int ret = ERROR_SUCCESS;
    
    if ((ret = enc->initialize(w)) != ERROR_SUCCESS) {
        return ret;
    }
    
    return ret;
}

int SrsTsStreamEncoder::write_audio(int64_t timestamp, char* data, int size)
{
    return enc->write_audio(timestamp, data, size);
}

int SrsTsStreamEncoder::write_video(int64_t timestamp, char* data, int size)
{
    return enc->write_video(timestamp, data, size);
}

int SrsTsStreamEncoder::write_metadata(int64_t /*timestamp*/, char* /*data*/, int /*size*/)
{
    return ERROR_SUCCESS;
}

bool SrsTsStreamEncoder::has_cache()
{
    // for ts stream, use gop cache of SrsSource is ok.
    return false;
}

int SrsTsStreamEncoder::dump_cache(SrsConsumer* /*consumer*/, SrsRtmpJitterAlgorithm /*jitter*/)
{
    // for ts stream, ignore cache.
    return ERROR_SUCCESS;
}

SrsFlvStreamEncoder::SrsFlvStreamEncoder()
{
    enc = new SrsFlvEncoder();
}

SrsFlvStreamEncoder::~SrsFlvStreamEncoder()
{
    srs_freep(enc);
}

int SrsFlvStreamEncoder::initialize(SrsFileWriter* w, SrsStreamCache* /*c*/)
{
    int ret = ERROR_SUCCESS;
    
    if ((ret = enc->initialize(w)) != ERROR_SUCCESS) {
        return ret;
    }
    
    // write flv header.
    if ((ret = enc->write_header())  != ERROR_SUCCESS) {
        return ret;
    }
    
    return ret;
}

int SrsFlvStreamEncoder::write_audio(int64_t timestamp, char* data, int size)
{
    return enc->write_audio(timestamp, data, size);
}

int SrsFlvStreamEncoder::write_video(int64_t timestamp, char* data, int size)
{
    return enc->write_video(timestamp, data, size);
}

int SrsFlvStreamEncoder::write_metadata(int64_t timestamp, char* data, int size)
{
    return enc->write_metadata(timestamp, data, size);
}

bool SrsFlvStreamEncoder::has_cache()
{
    // for flv stream, use gop cache of SrsSource is ok.
    return false;
}

int SrsFlvStreamEncoder::dump_cache(SrsConsumer* /*consumer*/, SrsRtmpJitterAlgorithm /*jitter*/)
{
    // for flv stream, ignore cache.
    return ERROR_SUCCESS;
}

#ifdef SRS_PERF_FAST_FLV_ENCODER
SrsFastFlvStreamEncoder::SrsFastFlvStreamEncoder()
{
}

SrsFastFlvStreamEncoder::~SrsFastFlvStreamEncoder()
{
}

int SrsFastFlvStreamEncoder::write_tags(SrsSharedPtrMessage** msgs, int count)
{
    return enc->write_tags(msgs, count);
}
#endif

SrsAacStreamEncoder::SrsAacStreamEncoder()
{
    enc = new SrsAacEncoder();
    cache = NULL;
}

SrsAacStreamEncoder::~SrsAacStreamEncoder()
{
    srs_freep(enc);
}

int SrsAacStreamEncoder::initialize(SrsFileWriter* w, SrsStreamCache* c)
{
    int ret = ERROR_SUCCESS;
    
    cache = c;
    
    if ((ret = enc->initialize(w)) != ERROR_SUCCESS) {
        return ret;
    }
    
    return ret;
}

int SrsAacStreamEncoder::write_audio(int64_t timestamp, char* data, int size)
{
    return enc->write_audio(timestamp, data, size);
}

int SrsAacStreamEncoder::write_video(int64_t /*timestamp*/, char* /*data*/, int /*size*/)
{
    // aac ignore any flv video.
    return ERROR_SUCCESS;
}

int SrsAacStreamEncoder::write_metadata(int64_t /*timestamp*/, char* /*data*/, int /*size*/)
{
    // aac ignore any flv metadata.
    return ERROR_SUCCESS;
}

bool SrsAacStreamEncoder::has_cache()
{
    return true;
}

int SrsAacStreamEncoder::dump_cache(SrsConsumer* consumer, SrsRtmpJitterAlgorithm jitter)
{
    srs_assert(cache);
    return cache->dump_cache(consumer, jitter);
}

SrsMp3StreamEncoder::SrsMp3StreamEncoder()
{
    enc = new SrsMp3Encoder();
    cache = NULL;
}

SrsMp3StreamEncoder::~SrsMp3StreamEncoder()
{
    srs_freep(enc);
}

int SrsMp3StreamEncoder::initialize(SrsFileWriter* w, SrsStreamCache* c)
{
    int ret = ERROR_SUCCESS;
    
    cache = c;
    
    if ((ret = enc->initialize(w)) != ERROR_SUCCESS) {
        return ret;
    }
    
    if ((ret = enc->write_header()) != ERROR_SUCCESS) {
        return ret;
    }
    
    return ret;
}

int SrsMp3StreamEncoder::write_audio(int64_t timestamp, char* data, int size)
{
    return enc->write_audio(timestamp, data, size);
}

int SrsMp3StreamEncoder::write_video(int64_t /*timestamp*/, char* /*data*/, int /*size*/)
{
    // mp3 ignore any flv video.
    return ERROR_SUCCESS;
}

int SrsMp3StreamEncoder::write_metadata(int64_t /*timestamp*/, char* /*data*/, int /*size*/)
{
    // mp3 ignore any flv metadata.
    return ERROR_SUCCESS;
}

bool SrsMp3StreamEncoder::has_cache()
{
    return true;
}

int SrsMp3StreamEncoder::dump_cache(SrsConsumer* consumer, SrsRtmpJitterAlgorithm jitter)
{
    srs_assert(cache);
    return cache->dump_cache(consumer, jitter);
}

SrsStreamWriter::SrsStreamWriter(ISrsHttpResponseWriter* w)
{
    writer = w;
}

SrsStreamWriter::~SrsStreamWriter()
{
}

int SrsStreamWriter::open(std::string /*file*/)
{
    return ERROR_SUCCESS;
}

void SrsStreamWriter::close()
{
}

bool SrsStreamWriter::is_open()
{
    return true;
}

int64_t SrsStreamWriter::tellg()
{
    return 0;
}

int SrsStreamWriter::write(void* buf, size_t count, ssize_t* pnwrite)
{
    if (pnwrite) {
        *pnwrite = count;
    }
    return writer->write((char*)buf, (int)count);
}

int SrsStreamWriter::writev(iovec* iov, int iovcnt, ssize_t* pnwrite)
{
    return writer->writev(iov, iovcnt, pnwrite);
}

SrsLiveStream::SrsLiveStream(SrsSource* s, SrsRequest* r, SrsStreamCache* c)
{
    source = s;
    cache = c;
    req = r->copy();
}

SrsLiveStream::~SrsLiveStream()
{
    srs_freep(req);
}

int SrsLiveStream::update(SrsSource* s, SrsRequest* r)
{
    int ret = ERROR_SUCCESS;

    srs_freep(req);
    source = s;
    req = r->copy();

    return ret;
}

int SrsLiveStream::serve_http(ISrsHttpResponseWriter* w, ISrsHttpMessage* r)
{
    int ret = ERROR_SUCCESS;
    
    ISrsStreamEncoder* enc = NULL;
    
    srs_assert(entry);
    if (srs_string_ends_with(entry->pattern, ".flv")) {
        w->header()->set_content_type("video/x-flv");
#ifdef SRS_PERF_FAST_FLV_ENCODER
        enc = new SrsFastFlvStreamEncoder();
#else
        enc = new SrsFlvStreamEncoder();
#endif
    } else if (srs_string_ends_with(entry->pattern, ".aac")) {
        w->header()->set_content_type("audio/x-aac");
        enc = new SrsAacStreamEncoder();
    } else if (srs_string_ends_with(entry->pattern, ".mp3")) {
        w->header()->set_content_type("audio/mpeg");
        enc = new SrsMp3StreamEncoder();
    } else if (srs_string_ends_with(entry->pattern, ".ts")) {
        w->header()->set_content_type("video/MP2T");
        enc = new SrsTsStreamEncoder();
    } else {
        ret = ERROR_HTTP_LIVE_STREAM_EXT;
        srs_error("http: unsupported pattern %s", entry->pattern.c_str());
        return ret;
    }
    SrsAutoFree(ISrsStreamEncoder, enc);
    
    // create consumer of souce, ignore gop cache, use the audio gop cache.
    SrsConsumer* consumer = NULL;
    if ((ret = source->create_consumer(NULL, consumer, true, true, !enc->has_cache())) != ERROR_SUCCESS) {
        srs_error("http: create consumer failed. ret=%d", ret);
        return ret;
    }
    SrsAutoFree(SrsConsumer, consumer);
    srs_verbose("http: consumer created success.");

    SrsPithyPrint* pprint = SrsPithyPrint::create_http_stream();
    SrsAutoFree(SrsPithyPrint, pprint);
    
    SrsMessageArray msgs(SRS_PERF_MW_MSGS);
    
    // the memory writer.
    SrsStreamWriter writer(w);
    if ((ret = enc->initialize(&writer, cache)) != ERROR_SUCCESS) {
        srs_error("http: initialize stream encoder failed. ret=%d", ret);
        return ret;
    }
    
    // if gop cache enabled for encoder, dump to consumer.
    if (enc->has_cache()) {
        if ((ret = enc->dump_cache(consumer, source->jitter())) != ERROR_SUCCESS) {
            srs_error("http: dump cache to consumer failed. ret=%d", ret);
            return ret;
        }
    }
    
#ifdef SRS_PERF_FAST_FLV_ENCODER
    SrsFastFlvStreamEncoder* ffe = dynamic_cast<SrsFastFlvStreamEncoder*>(enc);
#endif

    // TODO: free and erase the disabled entry after all related connections is closed.
    while (entry->enabled) {
        pprint->elapse();

        // get messages from consumer.
        // each msg in msgs.msgs must be free, for the SrsMessageArray never free them.
        int count = 0;
        if ((ret = consumer->dump_packets(&msgs, count)) != ERROR_SUCCESS) {
            srs_error("http: get messages from consumer failed. ret=%d", ret);
            return ret;
        }
        
        if (count <= 0) {
            srs_info("http: sleep %dms for no msg", SRS_CONSTS_RTMP_PULSE_TIMEOUT_US);
            // directly use sleep, donot use consumer wait.
            st_usleep(SRS_CONSTS_RTMP_PULSE_TIMEOUT_US);
            
            // ignore when nothing got.
            continue;
        }

        if (pprint->can_print()) {
            srs_info("-> "SRS_CONSTS_LOG_HTTP_STREAM" http: got %d msgs, age=%d, min=%d, mw=%d", 
                count, pprint->age(), SRS_PERF_MW_MIN_MSGS, SRS_CONSTS_RTMP_PULSE_TIMEOUT_US / 1000);
        }
        
        // sendout all messages.
#ifdef SRS_PERF_FAST_FLV_ENCODER
        if (ffe) {
            ret = ffe->write_tags(msgs.msgs, count);
        } else {
            ret = streaming_send_messages(enc, msgs.msgs, count);
        }
#else
        ret = streaming_send_messages(enc, msgs.msgs, count);
#endif
    
        // free the messages.
        for (int i = 0; i < count; i++) {
            SrsSharedPtrMessage* msg = msgs.msgs[i];
            srs_freep(msg);
        }
        
        // check send error code.
        if (ret != ERROR_SUCCESS) {
            if (!srs_is_client_gracefully_close(ret)) {
                srs_error("http: send messages to client failed. ret=%d", ret);
            }
            return ret;
        }
    }
    
    return ret;
}

int SrsLiveStream::streaming_send_messages(ISrsStreamEncoder* enc, SrsSharedPtrMessage** msgs, int nb_msgs)
{
    int ret = ERROR_SUCCESS;
    
    for (int i = 0; i < nb_msgs; i++) {
        SrsSharedPtrMessage* msg = msgs[i];
        
        if (msg->is_audio()) {
            ret = enc->write_audio(msg->timestamp, msg->payload, msg->size);
        } else if (msg->is_video()) {
            ret = enc->write_video(msg->timestamp, msg->payload, msg->size);
        } else {
            ret = enc->write_metadata(msg->timestamp, msg->payload, msg->size);
        }
        
        if (ret != ERROR_SUCCESS) {
            return ret;
        }
    }
    
    return ret;
}

SrsLiveEntry::SrsLiveEntry(std::string m, bool h)
{
    mount = m;
    hstrs = h;
    
    stream = NULL;
    cache = NULL;

    req = NULL;
    source = NULL;
    
    std::string ext;
    size_t pos = string::npos;
    if ((pos = m.rfind(".")) != string::npos) {
        ext = m.substr(pos);
    }
    _is_flv = (ext == ".flv");
    _is_ts = (ext == ".ts");
    _is_mp3 = (ext == ".mp3");
    _is_aac = (ext == ".aac");
}

void SrsLiveEntry::reset_hstrs(bool h)
{
    hstrs = h;
}

bool SrsLiveEntry::is_flv()
{
    return _is_flv;
}

bool SrsLiveEntry::is_ts()
{
    return _is_ts;
}

bool SrsLiveEntry::is_aac()
{
    return _is_aac;
}

bool SrsLiveEntry::is_mp3()
{
    return _is_mp3;
}

SrsHlsM3u8Stream::SrsHlsM3u8Stream()
{
}

SrsHlsM3u8Stream::~SrsHlsM3u8Stream()
{
}

void SrsHlsM3u8Stream::set_m3u8(std::string v)
{
    m3u8 = v;
}

int SrsHlsM3u8Stream::serve_http(ISrsHttpResponseWriter* w, ISrsHttpMessage* r)
{
    int ret = ERROR_SUCCESS;
    
    std::string data = m3u8;
    
    w->header()->set_content_length((int)data.length());
    w->header()->set_content_type("application/x-mpegURL;charset=utf-8");

    if ((ret = w->write((char*)data.data(), (int)data.length())) != ERROR_SUCCESS) {
        if (!srs_is_client_gracefully_close(ret)) {
            srs_error("send m3u8 failed. ret=%d", ret);
        }
        return ret;
    }

    return ret;
}

SrsHlsTsStream::SrsHlsTsStream()
{
}

SrsHlsTsStream::~SrsHlsTsStream()
{
}

void SrsHlsTsStream::set_ts(std::string v)
{
    ts = v;
}

int SrsHlsTsStream::serve_http(ISrsHttpResponseWriter* w, ISrsHttpMessage* r)
{
    int ret = ERROR_SUCCESS;
    
    std::string data = ts;
    
    w->header()->set_content_length((int)data.length());
    w->header()->set_content_type("video/MP2T");

    if ((ret = w->write((char*)data.data(), (int)data.length())) != ERROR_SUCCESS) {
        if (!srs_is_client_gracefully_close(ret)) {
            srs_error("send ts failed. ret=%d", ret);
        }
        return ret;
    }

    return ret;
}

SrsHlsEntry::SrsHlsEntry()
{
    tmpl = NULL;
}

SrsHttpStreamServer::SrsHttpStreamServer(SrsServer* svr)
{
    server = svr;
    
    mux.hijack(this);
    _srs_config->subscribe(this);
}

SrsHttpStreamServer::~SrsHttpStreamServer()
{
    mux.unhijack(this);
    _srs_config->unsubscribe(this);
    
    if (true) {
        std::map<std::string, SrsLiveEntry*>::iterator it;
        for (it = tflvs.begin(); it != tflvs.end(); ++it) {
            SrsLiveEntry* entry = it->second;
            srs_freep(entry->req);
            srs_freep(entry);
        }
        tflvs.clear();
    }
    if (true) {
        std::map<std::string, SrsLiveEntry*>::iterator it;
        for (it = sflvs.begin(); it != sflvs.end(); ++it) {
            SrsLiveEntry* entry = it->second;
            srs_freep(entry);
        }
        sflvs.clear();
    }
}

int SrsHttpStreamServer::initialize()
{
    int ret = ERROR_SUCCESS;
    
    // remux rtmp to flv live streaming
    if ((ret = initialize_flv_streaming()) != ERROR_SUCCESS) {
        return ret;
    }
    
    return ret;
}

// TODO: FIXME: rename for HTTP FLV mount.
int SrsHttpStreamServer::http_mount(SrsSource* s, SrsRequest* r)
{
    int ret = ERROR_SUCCESS;
    
    // the id to identify stream.
    std::string sid = r->get_stream_url();
    SrsLiveEntry* entry = NULL;
    
    // create stream from template when not found.
    if (sflvs.find(sid) == sflvs.end()) {
        if (tflvs.find(r->vhost) == tflvs.end()) {
            srs_info("ignore mount flv stream for disabled");
            return ret;
        }

        SrsLiveEntry* tmpl = tflvs[r->vhost];

        std::string mount = tmpl->mount;

        // replace the vhost variable
        mount = srs_string_replace(mount, "[vhost]", r->vhost);
        mount = srs_string_replace(mount, "[app]", r->app);
        mount = srs_string_replace(mount, "[stream]", r->stream);

        // remove the default vhost mount
        mount = srs_string_replace(mount, SRS_CONSTS_RTMP_DEFAULT_VHOST"/", "/");
        
        entry = new SrsLiveEntry(mount, tmpl->hstrs);
    
        entry->cache = new SrsStreamCache(s, r);
        entry->stream = new SrsLiveStream(s, r, entry->cache);

        // TODO: FIXME: maybe refine the logic of http remux service.
        // if user push streams followed:
        //     rtmp://test.com/live/stream1
        //     rtmp://test.com/live/stream2
        // and they will using the same template, such as: [vhost]/[app]/[stream].flv
        // so, need to free last request object, otherwise, it will cause memory leak.
        srs_freep(tmpl->req);

        tmpl->source = s;
        tmpl->req = r->copy();
        
        sflvs[sid] = entry;
        
        // mount the http flv stream.
        // we must register the handler, then start the thread,
        // for the thread will cause thread switch context.
        // @see https://github.com/ossrs/srs/issues/404
        if ((ret = mux.handle(mount, entry->stream)) != ERROR_SUCCESS) {
            srs_error("http: mount flv stream for vhost=%s failed. ret=%d", sid.c_str(), ret);
            return ret;
        }
        
        // start http stream cache thread
        if ((ret = entry->cache->start()) != ERROR_SUCCESS) {
            srs_error("http: start stream cache failed. ret=%d", ret);
            return ret;
        }
        srs_trace("http: mount flv stream for vhost=%s, mount=%s", sid.c_str(), mount.c_str());
    } else {
        entry = sflvs[sid];
        entry->stream->update(s, r);
        entry->cache->update(s, r);
    }

    if (entry->stream) {
        entry->stream->entry->enabled = true;
        return ret;
    }
    
    return ret;
}

void SrsHttpStreamServer::http_unmount(SrsSource* s, SrsRequest* r)
{
    std::string sid = r->get_stream_url();

    if (sflvs.find(sid) == sflvs.end()) {
        srs_info("ignore unmount flv stream for disabled");
        return;
    }

    SrsLiveEntry* entry = sflvs[sid];
    entry->stream->entry->enabled = false;
}

int SrsHttpStreamServer::on_reload_vhost_added(string vhost)
{
    int ret = ERROR_SUCCESS;

    if ((ret = on_reload_vhost_http_remux_updated(vhost)) != ERROR_SUCCESS) {
        return ret;
    }

    return ret;
}

int SrsHttpStreamServer::on_reload_vhost_http_remux_updated(string vhost)
{
    int ret = ERROR_SUCCESS;

    if (tflvs.find(vhost) == tflvs.end()) {
        if ((ret = initialize_flv_entry(vhost)) != ERROR_SUCCESS) {
            return ret;
        }

        // http mount need SrsRequest and SrsSource param, only create a mapping template entry
        // and do mount automatically on playing http flv if this stream is a new http_remux stream.
        return ret;
    }

    SrsLiveEntry* tmpl = tflvs[vhost];
    SrsRequest* req = tmpl->req;
    SrsSource* source = tmpl->source;

    if (source && req) {
        // cleanup the exists http remux.
        http_unmount(source, req);
    }

    if (!_srs_config->get_vhost_http_remux_enabled(vhost)) {
        return ret;
    }

    string old_tmpl_mount = tmpl->mount;
    string new_tmpl_mount = _srs_config->get_vhost_http_remux_mount(vhost);
    bool hstrs = _srs_config->get_vhost_http_remux_hstrs(vhost);

    tmpl->reset_hstrs(hstrs);

    /**
     * TODO: not support to reload different mount url for the time being.
     * if the mount is change, need more logical thing to deal with.
     * such as erase stream from sflvs and free all related resource.
     */
    srs_assert(old_tmpl_mount == new_tmpl_mount);

    // do http mount directly with SrsRequest and SrsSource if stream is played already.
    if (req) {
        std::string sid = req->get_stream_url();

        if (sflvs.find(sid) != sflvs.end()) {
            SrsLiveEntry* stream = sflvs[sid];
            stream->reset_hstrs(hstrs);
        }
        // remount stream.
        if ((ret = http_mount(source, req)) != ERROR_SUCCESS) {
            srs_trace("vhost %s http_remux reload failed", vhost.c_str());
            return ret;
        }
    } else {
        // for without SrsRequest and SrsSource if stream is not played yet, do http mount automatically
        // when start play this http flv stream.
    }

    srs_trace("vhost %s http_remux reload success", vhost.c_str());

    return ret;
}

int SrsHttpStreamServer::hijack(ISrsHttpMessage* request, ISrsHttpHandler** ph)
{
    int ret = ERROR_SUCCESS;
    
    // when handler not the root, we think the handler is ok.
    ISrsHttpHandler* h = *ph? *ph : NULL;
    if (h && h->entry && h->entry->pattern != "/") {
        return ret;
    }
    
    // only hijack for http streaming, http-flv/ts/mp3/aac.
    std::string ext = request->ext();
    if (ext.empty()) {
        return ret;
    }
    
    // find the actually request vhost.
    SrsConfDirective* vhost = _srs_config->get_vhost(request->host());
    if (!vhost || !_srs_config->get_vhost_enabled(vhost)) {
        return ret;
    }
    
    // find the entry template for the stream.
    SrsLiveEntry* entry = NULL;
    if (true) {
        // no http streaming on vhost, ignore.
        std::map<std::string, SrsLiveEntry*>::iterator it = tflvs.find(vhost->arg0());
        if (it == tflvs.end()) {
            return ret;
        }
        
        // hstrs not enabled, ignore.
        // for origin, the http stream will be mount already when publish,
        //      so it must never enter this line for stream already mounted.
        // for edge, the http stream is trigger by hstrs and mount by it,
        //      so we only hijack when only edge and hstrs is on.
        entry = it->second;
        if (!entry->hstrs) {
            return ret;
        }

        // check entry and request extension.
        if (entry->is_flv()) {
            if (ext != ".flv") {
                return ret;
            }
        } else if (entry->is_ts()) {
            if (ext != ".ts") {
                return ret;
            }
        } else if (entry->is_mp3()) {
            if (ext != ".mp3") {
                return ret;
            }
        } else if (entry->is_aac()) {
            if (ext != ".aac") {
                return ret;
            }
        } else {
            return ret;
        }
    }
    
    // convert to concreate class.
    SrsHttpMessage* hreq = dynamic_cast<SrsHttpMessage*>(request);
    srs_assert(hreq);
    
    // hijack for entry.
    SrsRequest* r = hreq->to_request(vhost->arg0());
    SrsAutoFree(SrsRequest, r);

    std::string sid = r->get_stream_url();
    // check whether the http remux is enabled,
    // for example, user disable the http flv then reload.
    if (sflvs.find(sid) != sflvs.end()) {
        SrsLiveEntry* s_entry = sflvs[sid];
        if (!s_entry->stream->entry->enabled) {
            // only when the http entry is disabled, check the config whether http flv disable,
            // for the http flv edge use hijack to trigger the edge ingester, we always mount it
            // eventhough the origin does not exists the specified stream.
            if (!_srs_config->get_vhost_http_remux_enabled(r->vhost)) {
                srs_error("stream is disabled, hijack failed. ret=%d", ret);
                return ret;
            }
        }
    }

    SrsSource* s = NULL;
    if ((ret = SrsSource::fetch_or_create(r, server, &s)) != ERROR_SUCCESS) {
        return ret;
    }
    srs_assert(s != NULL);

    // create http streaming handler.
    if ((ret = http_mount(s, r)) != ERROR_SUCCESS) {
        return ret;
    }

    // use the handler if exists.
    if (ph) {
        if (sflvs.find(sid) != sflvs.end()) {
            entry = sflvs[sid];
            *ph = entry->stream;
        }
    }
    
    // trigger edge to fetch from origin.
    bool vhost_is_edge = _srs_config->get_vhost_is_edge(r->vhost);
    srs_trace("hstrs: source url=%s, is_edge=%d, source_id=%d[%d]",
        r->get_stream_url().c_str(), vhost_is_edge, s->source_id(), s->source_id());
    
    return ret;
}

int SrsHttpStreamServer::initialize_flv_streaming()
{
    int ret = ERROR_SUCCESS;

    // http flv live stream mount for each vhost.
    SrsConfDirective* root = _srs_config->get_root();
    for (int i = 0; i < (int)root->directives.size(); i++) {
        SrsConfDirective* conf = root->at(i);
        
        if (!conf->is_vhost()) {
            continue;
        }

        if ((ret = initialize_flv_entry(conf->arg0())) != ERROR_SUCCESS) {
            return ret;
        }
    }
    return ret;
}

int SrsHttpStreamServer::initialize_flv_entry(std::string vhost)
{
    int ret = ERROR_SUCCESS;

    if (!_srs_config->get_vhost_http_remux_enabled(vhost)) {
        return ret;
    }

    SrsLiveEntry* entry = new SrsLiveEntry(
        _srs_config->get_vhost_http_remux_mount(vhost),
        _srs_config->get_vhost_http_remux_hstrs(vhost)
    );

    tflvs[vhost] = entry;
    srs_trace("http flv live stream, vhost=%s, mount=%s", 
        vhost.c_str(), entry->mount.c_str());

    return ret;
}

#endif