ZLMediaKit/server/WebHook.cpp

/*
 * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
 *
 * This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
 *
 * Use of this source code is governed by MIT license that can be found in the
 * LICENSE file in the root of the source tree. All contributing project authors
 * may be found in the AUTHORS file in the root of the source tree.
 */

#include <sstream>
#include "Util/logger.h"
#include "Util/onceToken.h"
#include "Util/NoticeCenter.h"
#include "Common/config.h"
#include "Common/MediaSource.h"
#include "Http/HttpSession.h"
#include "Http/HttpRequester.h"
#include "Network/Session.h"
#include "Rtsp/RtspSession.h"
#include "WebHook.h"
#include "WebApi.h"

using namespace std;
using namespace Json;
using namespace toolkit;
using namespace mediakit;

namespace Hook {
#define HOOK_FIELD "hook."

const string kEnable = HOOK_FIELD "enable";
const string kTimeoutSec = HOOK_FIELD "timeoutSec";
const string kOnPublish = HOOK_FIELD "on_publish";
const string kOnPlay = HOOK_FIELD "on_play";
const string kOnFlowReport = HOOK_FIELD "on_flow_report";
const string kOnRtspRealm = HOOK_FIELD "on_rtsp_realm";
const string kOnRtspAuth = HOOK_FIELD "on_rtsp_auth";
const string kOnStreamChanged = HOOK_FIELD "on_stream_changed";
const string kStreamChangedSchemas = HOOK_FIELD "stream_changed_schemas";
const string kOnStreamNotFound = HOOK_FIELD "on_stream_not_found";
const string kOnRecordMp4 = HOOK_FIELD "on_record_mp4";
const string kOnRecordTs = HOOK_FIELD "on_record_ts";
const string kOnShellLogin = HOOK_FIELD "on_shell_login";
const string kOnStreamNoneReader = HOOK_FIELD "on_stream_none_reader";
const string kOnHttpAccess = HOOK_FIELD "on_http_access";
const string kOnServerStarted = HOOK_FIELD "on_server_started";
const string kOnServerExited = HOOK_FIELD "on_server_exited";
const string kOnServerKeepalive = HOOK_FIELD "on_server_keepalive";
const string kOnSendRtpStopped = HOOK_FIELD "on_send_rtp_stopped";
const string kOnRtpServerTimeout = HOOK_FIELD "on_rtp_server_timeout";
const string kAliveInterval = HOOK_FIELD "alive_interval";
const string kRetry = HOOK_FIELD "retry";
const string kRetryDelay = HOOK_FIELD "retry_delay";

static onceToken token([]() {
    mINI::Instance()[kEnable] = false;
    mINI::Instance()[kTimeoutSec] = 10;
    // 默认hook地址设置为空，采用默认行为(例如不鉴权)
    mINI::Instance()[kOnPublish] = "";
    mINI::Instance()[kOnPlay] = "";
    mINI::Instance()[kOnFlowReport] = "";
    mINI::Instance()[kOnRtspRealm] = "";
    mINI::Instance()[kOnRtspAuth] = "";
    mINI::Instance()[kOnStreamChanged] = "";
    mINI::Instance()[kOnStreamNotFound] = "";
    mINI::Instance()[kOnRecordMp4] = "";
    mINI::Instance()[kOnRecordTs] = "";
    mINI::Instance()[kOnShellLogin] = "";
    mINI::Instance()[kOnStreamNoneReader] = "";
    mINI::Instance()[kOnHttpAccess] = "";
    mINI::Instance()[kOnServerStarted] = "";
    mINI::Instance()[kOnServerExited] = "";
    mINI::Instance()[kOnServerKeepalive] = "";
    mINI::Instance()[kOnSendRtpStopped] = "";
    mINI::Instance()[kOnRtpServerTimeout] = "";
    mINI::Instance()[kAliveInterval] = 30.0;
    mINI::Instance()[kRetry] = 1;
    mINI::Instance()[kRetryDelay] = 3.0;
    mINI::Instance()[kStreamChangedSchemas] = "rtsp/rtmp/fmp4/ts/hls/hls.fmp4";
});
} // namespace Hook

namespace Cluster {
#define CLUSTER_FIELD "cluster."
const string kOriginUrl = CLUSTER_FIELD "origin_url";
const string kTimeoutSec = CLUSTER_FIELD "timeout_sec";
const string kRetryCount = CLUSTER_FIELD "retry_count";

static onceToken token([]() {
    mINI::Instance()[kOriginUrl] = "";
    mINI::Instance()[kTimeoutSec] = 15;
    mINI::Instance()[kRetryCount] = 3;
});

} // namespace Cluster

static void parse_http_response(const SockException &ex, const Parser &res, const function<void(const Value &, const string &, bool)> &fun) {
    bool should_retry = true;
    if (ex) {
        auto errStr = StrPrinter << "[network err]:" << ex << endl;
        fun(Json::nullValue, errStr, should_retry);
        return;
    }
    if (res.status() != "200") {
        auto errStr = StrPrinter << "[bad http status code]:" << res.status() << endl;
        fun(Json::nullValue, errStr, should_retry);
        return;
    }
    Value result;
    try {
        stringstream ss(res.content());
        ss >> result;
    } catch (std::exception &ex) {
        auto errStr = StrPrinter << "[parse json failed]:" << ex.what() << endl;
        fun(Json::nullValue, errStr, should_retry);
        return;
    }
    auto code = result["code"];

    if (!code.isInt64()) {
        auto errStr = StrPrinter << "[json code]:" << "code not int:" << code << endl;
        fun(Json::nullValue, errStr, should_retry);
        return;
    }
    should_retry = false;
    if (code.asInt64() != 0) {
        auto errStr = StrPrinter << "[auth failed]: code:" << code << " msg:" << result["msg"] << endl;
        fun(Json::nullValue, errStr, should_retry);
        return;
    }

    try {
        fun(result, "", should_retry);
    } catch (std::exception &ex) {
        auto errStr = StrPrinter << "[do hook invoker failed]:" << ex.what() << endl;
        // 如果还是抛异常，那么再上抛异常
        fun(Json::nullValue, errStr, should_retry);
    }
}

string to_string(const Value &value) {
    return value.toStyledString();
}

string to_string(const HttpArgs &value) {
    return value.make();
}

const char *getContentType(const Value &value) {
    return "application/json";
}

const char *getContentType(const HttpArgs &value) {
    return "application/x-www-form-urlencoded";
}

string getVhost(const Value &value) {
    const char *key = VHOST_KEY;
    auto val = value.find(key, key + sizeof(VHOST_KEY) - 1);
    return val ? val->asString() : "";
}

string getVhost(const HttpArgs &value) {
    auto val = value.find(VHOST_KEY);
    return val != value.end() ? val->second : "";
}

static atomic<uint64_t> s_hook_index { 0 };

void do_http_hook(const string &url, const ArgsType &body, const function<void(const Value &, const string &)> &func, uint32_t retry) {
    GET_CONFIG(string, mediaServerId, General::kMediaServerId);
    GET_CONFIG(float, hook_timeoutSec, Hook::kTimeoutSec);
    GET_CONFIG(float, retry_delay, Hook::kRetryDelay);

    const_cast<ArgsType &>(body)["mediaServerId"] = mediaServerId;
    const_cast<ArgsType &>(body)["hook_index"] = s_hook_index++;

    auto requester = std::make_shared<HttpRequester>();
    requester->setMethod("POST");
    auto bodyStr = to_string(body);
    requester->setBody(bodyStr);
    requester->addHeader("Content-Type", getContentType(body));
    auto vhost = getVhost(body);
    if (!vhost.empty()) {
        requester->addHeader("X-VHOST", vhost);
    }
    Ticker ticker;
    requester->startRequester(url, [url, func, bodyStr, body, requester, ticker, retry](const SockException &ex, const Parser &res) mutable {
        onceToken token(nullptr, [&]() mutable { requester.reset(); });
        parse_http_response(ex, res, [&](const Value &obj, const string &err, bool should_retry) {
            if (!err.empty()) {
                // hook失败
                WarnL << "hook " << url << " " << ticker.elapsedTime() << "ms,failed" << err << ":" << bodyStr;

                if (retry-- > 0 && should_retry) {
                    requester->getPoller()->doDelayTask(MAX(retry_delay, 0.0) * 1000, [url, body, func, retry] {
                        do_http_hook(url, body, func, retry);
                        return 0;
                    });
                    // 重试不需要触发回调
                    return;
                }

            } else if (ticker.elapsedTime() > 500) {
                // hook成功，但是hook响应超过500ms，打印警告日志
                DebugL << "hook " << url << " " << ticker.elapsedTime() << "ms,success:" << bodyStr;
            }

            if (func) {
                func(obj, err);
            }
        });
    }, hook_timeoutSec);
}

void do_http_hook(const string &url, const ArgsType &body, const function<void(const Value &, const string &)> &func) {
    GET_CONFIG(uint32_t, hook_retry, Hook::kRetry);
    do_http_hook(url, body, func, hook_retry);
}

void dumpMediaTuple(const MediaTuple &tuple, Json::Value& item);

static ArgsType make_json(const MediaInfo &args) {
    ArgsType body;
    body["schema"] = args.schema;
    dumpMediaTuple(args, body);
    body["params"] = args.param_strs;
    return body;
}

static void reportServerStarted() {
    GET_CONFIG(bool, hook_enable, Hook::kEnable);
    GET_CONFIG(string, hook_server_started, Hook::kOnServerStarted);
    if (!hook_enable || hook_server_started.empty()) {
        return;
    }

    ArgsType body;
    for (auto &pr : mINI::Instance()) {
        body[pr.first] = (string &)pr.second;
    }
    // 执行hook
    do_http_hook(hook_server_started, body, nullptr);
}

static void reportServerExited() {
    GET_CONFIG(bool, hook_enable, Hook::kEnable);
    GET_CONFIG(string, hook_server_exited, Hook::kOnServerExited);
    if (!hook_enable || hook_server_exited.empty()) {
        return;
    }

    const ArgsType body;
    // 执行hook
    do_http_hook(hook_server_exited, body, nullptr);
}

// 服务器定时保活定时器
static Timer::Ptr g_keepalive_timer;
static void reportServerKeepalive() {
    GET_CONFIG(bool, hook_enable, Hook::kEnable);
    GET_CONFIG(string, hook_server_keepalive, Hook::kOnServerKeepalive);
    if (!hook_enable || hook_server_keepalive.empty()) {
        return;
    }

    GET_CONFIG(float, alive_interval, Hook::kAliveInterval);
    g_keepalive_timer = std::make_shared<Timer>(alive_interval,[]() {
        getStatisticJson([](const Value &data) mutable {
            ArgsType body;
            body["data"] = data;
            // 执行hook
            do_http_hook(hook_server_keepalive, body, nullptr);
        });
        return true;
    }, nullptr);
}

static const string kEdgeServerParam = "edge=1";

static string getPullUrl(const string &origin_fmt, const MediaInfo &info) {
    char url[1024] = { 0 };
    if ((ssize_t)origin_fmt.size() > snprintf(url, sizeof(url), origin_fmt.data(), info.app.data(), info.stream.data())) {
        WarnL << "get origin url failed, origin_fmt:" << origin_fmt;
        return "";
    }
    // 告知源站这是来自边沿站的拉流请求，如果未找到流请立即返回拉流失败
    return string(url) + '?' + kEdgeServerParam + '&' + VHOST_KEY + '=' + info.vhost + '&' + info.param_strs;
}

static void pullStreamFromOrigin(const vector<string> &urls, size_t index, size_t failed_cnt, const MediaInfo &args, const function<void()> &closePlayer) {
    GET_CONFIG(float, cluster_timeout_sec, Cluster::kTimeoutSec);
    GET_CONFIG(int, retry_count, Cluster::kRetryCount);

    auto url = getPullUrl(urls[index % urls.size()], args);
    auto timeout_sec = cluster_timeout_sec / urls.size();
    InfoL << "pull stream from origin, failed_cnt: " << failed_cnt << ", timeout_sec: " << timeout_sec << ", url: " << url;

    ProtocolOption option;
    option.enable_hls = option.enable_hls || (args.schema == HLS_SCHEMA);
    option.enable_mp4 = false;

    addStreamProxy(args.vhost, args.app, args.stream, url, retry_count, option, Rtsp::RTP_TCP, timeout_sec, [=](const SockException &ex, const string &key) mutable {
        if (!ex) {
            return;
        }
        // 拉流失败
        if (++failed_cnt == urls.size()) {
            // 已经重试所有源站了
            WarnL << "pull stream from origin final failed: " << url;
            closePlayer();
            return;
        }
        pullStreamFromOrigin(urls, index + 1, failed_cnt, args, closePlayer);
    });
}

static void *web_hook_tag = nullptr;

static mINI jsonToMini(const Value &obj) {
    mINI ret;
    if (obj.isObject()) {
        for (auto it = obj.begin(); it != obj.end(); ++it) {
            try {
                auto str = (*it).asString();
                ret[it.name()] = std::move(str);
            } catch (std::exception &) {
                WarnL << "Json is not convertible to string, key: " << it.name() << ", value: " << (*it);
            }
        }
    }
    return ret;
}

void installWebHook() {
    GET_CONFIG(bool, hook_enable, Hook::kEnable);

    NoticeCenter::Instance().addListener(&web_hook_tag, Broadcast::kBroadcastMediaPublish, [](BroadcastMediaPublishArgs) {
        GET_CONFIG(string, hook_publish, Hook::kOnPublish);
        if (!hook_enable || hook_publish.empty()) {
            invoker("", ProtocolOption());
            return;
        }
        // 异步执行该hook api，防止阻塞NoticeCenter
        auto body = make_json(args);
        body["ip"] = sender.get_peer_ip();
        body["port"] = sender.get_peer_port();
        body["id"] = sender.getIdentifier();
        body["originType"] = (int)type;
        body["originTypeStr"] = getOriginTypeString(type);
        // 执行hook
        do_http_hook(hook_publish, body, [invoker](const Value &obj, const string &err) mutable {
            if (err.empty()) {
                // 推流鉴权成功
                invoker(err, ProtocolOption(jsonToMini(obj)));
            } else {
                // 推流鉴权失败
                invoker(err, ProtocolOption());
            }
        });
    });

    NoticeCenter::Instance().addListener(&web_hook_tag, Broadcast::kBroadcastMediaPlayed, [](BroadcastMediaPlayedArgs) {
        GET_CONFIG(string, hook_play, Hook::kOnPlay);
        if (!hook_enable || hook_play.empty()) {
            invoker("");
            return;
        }
        auto body = make_json(args);
        body["ip"] = sender.get_peer_ip();
        body["port"] = sender.get_peer_port();
        body["id"] = sender.getIdentifier();
        // 执行hook
        do_http_hook(hook_play, body, [invoker](const Value &obj, const string &err) { invoker(err); });
    });

    NoticeCenter::Instance().addListener(&web_hook_tag, Broadcast::kBroadcastFlowReport, [](BroadcastFlowReportArgs) {
        GET_CONFIG(string, hook_flowreport, Hook::kOnFlowReport);
        if (!hook_enable || hook_flowreport.empty()) {
            return;
        }
        auto body = make_json(args);
        body["totalBytes"] = (Json::UInt64)totalBytes;
        body["duration"] = (Json::UInt64)totalDuration;
        body["player"] = isPlayer;
        body["ip"] = sender.get_peer_ip();
        body["port"] = sender.get_peer_port();
        body["id"] = sender.getIdentifier();
        // 执行hook
        do_http_hook(hook_flowreport, body, nullptr);
    });

    static const string unAuthedRealm = "unAuthedRealm";

    // 监听kBroadcastOnGetRtspRealm事件决定rtsp链接是否需要鉴权(传统的rtsp鉴权方案)才能访问
    NoticeCenter::Instance().addListener(&web_hook_tag, Broadcast::kBroadcastOnGetRtspRealm, [](BroadcastOnGetRtspRealmArgs) {
        GET_CONFIG(string, hook_rtsp_realm, Hook::kOnRtspRealm);
        if (!hook_enable || hook_rtsp_realm.empty()) {
            // 无需认证
            invoker("");
            return;
        }
        auto body = make_json(args);
        body["ip"] = sender.get_peer_ip();
        body["port"] = sender.get_peer_port();
        body["id"] = sender.getIdentifier();
        // 执行hook
        do_http_hook(hook_rtsp_realm, body, [invoker](const Value &obj, const string &err) {
            if (!err.empty()) {
                // 如果接口访问失败，那么该rtsp流认证失败
                invoker(unAuthedRealm);
                return;
            }
            invoker(obj["realm"].asString());
        });
    });

    // 监听kBroadcastOnRtspAuth事件返回正确的rtsp鉴权用户密码
    NoticeCenter::Instance().addListener(&web_hook_tag, Broadcast::kBroadcastOnRtspAuth, [](BroadcastOnRtspAuthArgs) {
        GET_CONFIG(string, hook_rtsp_auth, Hook::kOnRtspAuth);
        if (unAuthedRealm == realm || !hook_enable || hook_rtsp_auth.empty()) {
            // 认证失败
            invoker(false, makeRandStr(12));
            return;
        }
        auto body = make_json(args);
        body["ip"] = sender.get_peer_ip();
        body["port"] = sender.get_peer_port();
        body["id"] = sender.getIdentifier();
        body["user_name"] = user_name;
        body["must_no_encrypt"] = must_no_encrypt;
        body["realm"] = realm;
        // 执行hook
        do_http_hook(hook_rtsp_auth, body, [invoker](const Value &obj, const string &err) {
            if (!err.empty()) {
                // 认证失败
                invoker(false, makeRandStr(12));
                return;
            }
            invoker(obj["encrypted"].asBool(), obj["passwd"].asString());
        });
    });

    // 监听rtsp、rtmp源注册或注销事件
    NoticeCenter::Instance().addListener(&web_hook_tag, Broadcast::kBroadcastMediaChanged, [](BroadcastMediaChangedArgs) {
        GET_CONFIG(string, hook_stream_changed, Hook::kOnStreamChanged);
        if (!hook_enable || hook_stream_changed.empty()) {
            return;
        }
        GET_CONFIG_FUNC(std::set<std::string>, stream_changed_set, Hook::kStreamChangedSchemas, [](const std::string &str) {
            std::set<std::string> ret;
            auto vec = split(str, "/");
            for (auto &schema : vec) {
                trim(schema);
                if (!schema.empty()) {
                    ret.emplace(schema);
                }
            }
            return ret;
        });
        if (!stream_changed_set.empty() && stream_changed_set.find(sender.getSchema()) == stream_changed_set.end()) {
            // 该协议注册注销事件被忽略
            return;
        }

        ArgsType body;
        if (bRegist) {
            body = makeMediaSourceJson(sender);
            body["regist"] = bRegist;
        } else {
            body["schema"] = sender.getSchema();
            dumpMediaTuple(sender.getMediaTuple(), body);
            body["regist"] = bRegist;
        }
        // 执行hook
        do_http_hook(hook_stream_changed, body, nullptr);
    });

    GET_CONFIG_FUNC(vector<string>, origin_urls, Cluster::kOriginUrl, [](const string &str) {
        vector<string> ret;
        for (auto &url : split(str, ";")) {
            trim(url);
            if (!url.empty()) {
                ret.emplace_back(url);
            }
        }
        return ret;
    });

    // 监听播放失败(未找到特定的流)事件
    NoticeCenter::Instance().addListener(&web_hook_tag, Broadcast::kBroadcastNotFoundStream, [](BroadcastNotFoundStreamArgs) {
        if (!origin_urls.empty()) {
            // 设置了源站，那么尝试溯源
            static atomic<uint8_t> s_index { 0 };
            pullStreamFromOrigin(origin_urls, s_index.load(), 0, args, closePlayer);
            ++s_index;
            return;
        }

        if (start_with(args.param_strs, kEdgeServerParam)) {
            // 源站收到来自边沿站的溯源请求，流不存在时立即返回拉流失败
            closePlayer();
            return;
        }

        GET_CONFIG(string, hook_stream_not_found, Hook::kOnStreamNotFound);
        if (!hook_enable || hook_stream_not_found.empty()) {
            return;
        }
        auto body = make_json(args);
        body["ip"] = sender.get_peer_ip();
        body["port"] = sender.get_peer_port();
        body["id"] = sender.getIdentifier();

        // Hook回复立即关闭流
        auto res_cb = [closePlayer](const Value &res, const string &err) {
            bool flag = res["close"].asBool();
            if (flag) {
                closePlayer();
            }
        };

        // 执行hook
        do_http_hook(hook_stream_not_found, body, res_cb);
    });

    static auto getRecordInfo = [](const RecordInfo &info) {
        ArgsType body;
        body["start_time"] = (Json::UInt64)info.start_time;
        body["file_size"] = (Json::UInt64)info.file_size;
        body["time_len"] = info.time_len;
        body["file_path"] = info.file_path;
        body["file_name"] = info.file_name;
        body["folder"] = info.folder;
        body["url"] = info.url;
        dumpMediaTuple(info, body);
        return body;
    };

#ifdef ENABLE_MP4
    // 录制mp4文件成功后广播
    NoticeCenter::Instance().addListener(&web_hook_tag, Broadcast::kBroadcastRecordMP4, [](BroadcastRecordMP4Args) {
        GET_CONFIG(string, hook_record_mp4, Hook::kOnRecordMp4);
        if (!hook_enable || hook_record_mp4.empty()) {
            return;
        }
        // 执行hook
        do_http_hook(hook_record_mp4, getRecordInfo(info), nullptr);
    });
#endif // ENABLE_MP4

    NoticeCenter::Instance().addListener(&web_hook_tag, Broadcast::kBroadcastRecordTs, [](BroadcastRecordTsArgs) {
        GET_CONFIG(string, hook_record_ts, Hook::kOnRecordTs);
        if (!hook_enable || hook_record_ts.empty()) {
            return;
        }
        // 执行 hook
        do_http_hook(hook_record_ts, getRecordInfo(info), nullptr);
    });

    NoticeCenter::Instance().addListener(&web_hook_tag, Broadcast::kBroadcastShellLogin, [](BroadcastShellLoginArgs) {
        GET_CONFIG(string, hook_shell_login, Hook::kOnShellLogin);
        if (!hook_enable || hook_shell_login.empty()) {
            invoker("");
            return;
        }
        ArgsType body;
        body["ip"] = sender.get_peer_ip();
        body["port"] = sender.get_peer_port();
        body["id"] = sender.getIdentifier();
        body["user_name"] = user_name;
        body["passwd"] = passwd;

        // 执行hook
        do_http_hook(hook_shell_login, body, [invoker](const Value &, const string &err) { invoker(err); });
    });

    NoticeCenter::Instance().addListener(&web_hook_tag, Broadcast::kBroadcastStreamNoneReader, [](BroadcastStreamNoneReaderArgs) {
        if (!origin_urls.empty()) {
            // 边沿站无人观看时立即停止溯源
            sender.close(false);
            WarnL << "无人观看主动关闭流:" << sender.getOriginUrl();
            return;
        }
        GET_CONFIG(string, hook_stream_none_reader, Hook::kOnStreamNoneReader);
        if (!hook_enable || hook_stream_none_reader.empty()) {
            return;
        }

        ArgsType body;
        body["schema"] = sender.getSchema();
        dumpMediaTuple(sender.getMediaTuple(), body);
        weak_ptr<MediaSource> weakSrc = sender.shared_from_this();
        // 执行hook
        do_http_hook(hook_stream_none_reader, body, [weakSrc](const Value &obj, const string &err) {
            bool flag = obj["close"].asBool();
            auto strongSrc = weakSrc.lock();
            if (!flag || !err.empty() || !strongSrc) {
                return;
            }
            strongSrc->close(false);
            WarnL << "无人观看主动关闭流:" << strongSrc->getOriginUrl();
        });
    });

    NoticeCenter::Instance().addListener(&web_hook_tag, Broadcast::kBroadcastSendRtpStopped, [](BroadcastSendRtpStoppedArgs) {
        GET_CONFIG(string, hook_send_rtp_stopped, Hook::kOnSendRtpStopped);
        if (!hook_enable || hook_send_rtp_stopped.empty()) {
            return;
        }

        ArgsType body;
        dumpMediaTuple(sender.getMediaTuple(), body);
        body["ssrc"] = ssrc;
        body["originType"] = (int)sender.getOriginType(MediaSource::NullMediaSource());
        body["originTypeStr"] = getOriginTypeString(sender.getOriginType(MediaSource::NullMediaSource()));
        body["originUrl"] = sender.getOriginUrl(MediaSource::NullMediaSource());
        body["msg"] = ex.what();
        body["err"] = ex.getErrCode();
        // 执行hook
        do_http_hook(hook_send_rtp_stopped, body, nullptr);
    });

    /**
     * kBroadcastHttpAccess事件触发机制
     * 1、根据http请求头查找cookie，找到进入步骤3
     * 2、根据http url参数查找cookie，如果还是未找到cookie则进入步骤5
     * 3、cookie标记是否有权限访问文件，如果有权限，直接返回文件
     * 4、cookie中记录的url参数是否跟本次url参数一致，如果一致直接返回客户端错误码
     * 5、触发kBroadcastHttpAccess事件
     */
    // 开发者应该通过该事件判定http客户端是否有权限访问http服务器上的特定文件
    // ZLMediaKit会记录本次鉴权的结果至cookie
    // 如果鉴权成功，在cookie有效期内，那么下次客户端再访问授权目录时，ZLMediaKit会直接返回文件
    // 如果鉴权失败，在cookie有效期内，如果http url参数不变(否则会立即再次触发鉴权事件)，ZLMediaKit会直接返回错误码
    // 如果用户客户端不支持cookie，那么ZLMediaKit会根据url参数查找cookie并追踪用户，
    // 如果没有url参数，客户端又不支持cookie，那么会根据ip和端口追踪用户
    // 追踪用户的目的是为了缓存上次鉴权结果，减少鉴权次数，提高性能
    NoticeCenter::Instance().addListener(&web_hook_tag, Broadcast::kBroadcastHttpAccess, [](BroadcastHttpAccessArgs) {
        GET_CONFIG(string, hook_http_access, Hook::kOnHttpAccess);
        if (!hook_enable || hook_http_access.empty()) {
            // 未开启http文件访问鉴权，那么允许访问，但是每次访问都要鉴权；
            // 因为后续随时都可能开启鉴权(重载配置文件后可能重新开启鉴权)
            if (!HttpFileManager::isIPAllowed(sender.get_peer_ip())) {
                invoker("Your ip is not allowed to access the service.", "", 0);
            } else {
                invoker("", "", 0);
            }
            return;
        }

        ArgsType body;
        body["ip"] = sender.get_peer_ip();
        body["port"] = sender.get_peer_port();
        body["id"] = sender.getIdentifier();
        body["path"] = path;
        body["is_dir"] = is_dir;
        body["params"] = parser.params();
        for (auto &pr : parser.getHeader()) {
            body[string("header.") + pr.first] = pr.second;
        }
        // 执行hook
        do_http_hook(hook_http_access, body, [invoker](const Value &obj, const string &err) {
            if (!err.empty()) {
                // 如果接口访问失败，那么仅限本次没有访问http服务器的权限
                invoker(err, "", 0);
                return;
            }
            // err参数代表不能访问的原因，空则代表可以访问
            // path参数是该客户端能访问或被禁止的顶端目录，如果path为空字符串，则表述为当前目录
            // second参数规定该cookie超时时间，如果second为0，本次鉴权结果不缓存
            invoker(obj["err"].asString(), obj["path"].asString(), obj["second"].asInt());
        });
    });

    NoticeCenter::Instance().addListener(&web_hook_tag, Broadcast::KBroadcastRtpServerTimeout, [](BroadcastRtpServerTimeoutArgs) {
        GET_CONFIG(string, rtp_server_timeout, Hook::kOnRtpServerTimeout);
        if (!hook_enable || rtp_server_timeout.empty()) {
            return;
        }

        ArgsType body;
        body["local_port"] = local_port;
        body["stream_id"] = stream_id;
        body["tcp_mode"] = tcp_mode;
        body["re_use_port"] = re_use_port;
        body["ssrc"] = ssrc;
        do_http_hook(rtp_server_timeout, body);
    });

    // 汇报服务器重新启动
    reportServerStarted();

    // 定时上报保活
    reportServerKeepalive();
}

void unInstallWebHook() {
    g_keepalive_timer.reset();
    NoticeCenter::Instance().delListener(&web_hook_tag);
}

void onProcessExited() {
    reportServerExited();
}