Line data    Source code

       1              : /*
       2              :  ___________________________________________
       3              : |    _     ___                        _     |
       4              : |   | |   |__ \                      | |    |
       5              : |   | |__    ) |__ _  __ _  ___ _ __ | |_   |
       6              : |   | '_ \  / // _` |/ _` |/ _ \ '_ \| __|  |  HTTP/2 AGENT FOR MOCK TESTING
       7              : |   | | | |/ /| (_| | (_| |  __/ | | | |_   |  Version 0.0.z
       8              : |   |_| |_|____\__,_|\__, |\___|_| |_|\__|  |  https://github.com/testillano/h2agent
       9              : |                     __/ |                 |
      10              : |                    |___/                  |
      11              : |___________________________________________|
      12              : 
      13              : Licensed under the MIT License <http://opensource.org/licenses/MIT>.
      14              : SPDX-License-Identifier: MIT
      15              : Copyright (c) 2021 Eduardo Ramos
      16              : 
      17              : Permission is hereby  granted, free of charge, to any  person obtaining a copy
      18              : of this software and associated  documentation files (the "Software"), to deal
      19              : in the Software  without restriction, including without  limitation the rights
      20              : to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
      21              : copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
      22              : furnished to do so, subject to the following conditions:
      23              : 
      24              : The above copyright notice and this permission notice shall be included in all
      25              : copies or substantial portions of the Software.
      26              : 
      27              : THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
      28              : IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
      29              : FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
      30              : AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
      31              : LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
      32              : OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
      33              : SOFTWARE.
      34              : */
      35              : 
      36              : #pragma once
      37              : 
      38              : #include <string>
      39              : #include <unordered_set>
      40              : #include <unordered_map>
      41              : #include <functional>
      42              : #include <mutex>
      43              : #include <atomic>
      44              : 
      45              : #include <nlohmann/json.hpp>
      46              : 
      47              : namespace h2agent
      48              : {
      49              : namespace model
      50              : {
      51              : 
      52              : /**
      53              :  * Manages Server-Sent Events (SSE) connections for vault event streaming.
      54              :  *
      55              :  * Each connection watches a set of vault keys. When a vault mutation occurs,
      56              :  * matching connections receive the event via their write callback.
      57              :  */
      58              : class SseManager
      59              : {
      60              : public:
      61              :     using write_cb_t = std::function<void(const std::string &)>;
      62              : 
      63            5 :     SseManager() = default;
      64            5 :     ~SseManager() = default;
      65              : 
      66              :     /**
      67              :      * Registers an SSE connection.
      68              :      *
      69              :      * @param keys Set of vault keys this connection watches (empty = all keys)
      70              :      * @param writeCb Callback to write SSE-formatted data to the stream
      71              :      * @return Connection ID for later removal
      72              :      */
      73              :     uint64_t addConnection(std::unordered_set<std::string> keys, write_cb_t writeCb);
      74              : 
      75              :     /**
      76              :      * Removes an SSE connection.
      77              :      */
      78              :     void removeConnection(uint64_t id);
      79              : 
      80              :     /**
      81              :      * Notifies all matching connections of a vault mutation.
      82              :      * Called by Vault on every write.
      83              :      */
      84              :     void notify(const std::string &key, const nlohmann::json &value);
      85              : 
      86              :     /** Returns number of active SSE connections. */
      87              :     size_t activeConnections() const;
      88              : 
      89              : private:
      90              :     struct Connection {
      91              :         std::unordered_set<std::string> keys; // empty = watch all
      92              :         write_cb_t writeCb;
      93              :     };
      94              : 
      95              :     mutable std::mutex mutex_;
      96              :     std::unordered_map<uint64_t, Connection> connections_;
      97              :     std::atomic<uint64_t> next_id_{1};
      98              : };
      99              : 
     100              : }
     101              : }