Add MySQL Cache Manager & code cleanup

cache_managers/mysql_cache_manager/include/db_conn.h

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+// Copyright 2016 Etix Labs
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <cppconn/resultset.h> // for ResultSet
+#include <mutex>               // for mutex
+#include <stdbool.h>           // for bool, false
+#include <string>              // for string
+#include <utility>             // for pair, make_pair
+
+#include "query_result.h"
+
+namespace sql {
+class Connection;
+class Driver;
+class ResultSet;
+}
+
+namespace etix {
+
+namespace cameradar {
+
+namespace mysql {
+
+//! MySQL Database connection handling
+//! Abstracts all connection to the database
+class db_connection {
+private:
+    static const std::string create_database_query;
+
+    //! SQL driver
+    sql::Driver* driver = nullptr;
+    //! SQL connection
+    sql::Connection* connection = nullptr;
+    std::mutex access_mtx;
+    bool connected = false;
+
+    std::string db_name;
+
+    //! Create the database if it doesn't exist at connector launch
+    empty_result create_database(void);
+
+public:
+    db_connection(void);
+    ~db_connection(void);
+
+    //! Try to connect to the database
+    std::pair<bool, std::string> connect(const std::string& host,
+                                         const std::string& user,
+                                         const std::string& pass,
+                                         const std::string& db_name,
+                                         bool create_db_if_not_exist = true);
+
+    //! Execute a MySQL command
+    empty_result execute(const std::string& request);
+
+    //! Execute a query
+    query_result<sql::ResultSet*> query(const std::string& query);
+
+    bool is_connected();
+
+    //! Return db_name
+    const std::string&
+    get_db_name(void) const {
+        return this->db_name;
+    }
+};
+
+} // mysql
+
+} // cameradar
+
+} // etix

cache_managers/mysql_cache_manager/include/mysql_cache_manager.h

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+// Copyright 2016 Etix Labs
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <cachemanager.h>
+#include <configuration.h>
+#include <db_conn.h>
+#include <fmt.h>
+#include <logger.h>
+#include <stream_model.h>
+#include <vector>
+
+namespace etix {
+
+namespace cameradar {
+
+struct mysql_configuration {
+    unsigned int port;
+    std::string host;
+    std::string db_name;
+    std::string user;
+    std::string password;
+
+    mysql_configuration() = default;
+
+    mysql_configuration(unsigned int port,
+                        const std::string& host,
+                        const std::string& db_name,
+                        const std::string& user = "",
+                        const std::string& password = "")
+    : port(port), host(host), db_name(db_name), user(user), password(password) {}
+};
+
+class mysql_cache_manager : public cache_manager_base {
+private:
+    static const std::string name;
+    std::vector<etix::cameradar::stream_model> streams;
+    std::shared_ptr<etix::cameradar::configuration> configuration;
+    etix::cameradar::mysql_configuration db_conf;
+    etix::cameradar::mysql::db_connection connection;
+
+    static const std::string create_table_query;
+    static const std::string insert_with_id_query;
+    static const std::string exist_query;
+    static const std::string get_results_query;
+    static const std::string update_result_query;
+
+public:
+    using cache_manager_base::cache_manager_base;
+    ~mysql_cache_manager();
+
+    // Specific to MySQL
+    bool execute_query(const std::string& query);
+
+    const std::string& get_name() const override;
+    static const std::string& static_get_name();
+    bool load_mysql_conf(std::shared_ptr<etix::cameradar::configuration> configuration);
+    bool configure(std::shared_ptr<etix::cameradar::configuration> configuration) override;
+
+    void set_streams(std::vector<etix::cameradar::stream_model> model);
+
+    void update_stream(const etix::cameradar::stream_model& newmodel);
+
+    std::vector<etix::cameradar::stream_model> get_streams();
+
+    std::vector<etix::cameradar::stream_model> get_valid_streams();
+};
+}
+}

cache_managers/mysql_cache_manager/include/query_result.h

@@ -0,0 +1,65 @@
+// Copyright 2016 Etix Labs
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+namespace etix {
+
+namespace cameradar {
+
+namespace mysql {
+
+enum class execute_result { success, not_found, no_row_updated, sql_error, error };
+
+//! Wrapper of a DB query result
+//! Templated on the data type we want to return (list<model>, bool, whatever)
+template <typename DataType>
+struct query_result {
+    DataType data;
+    execute_result state;
+    std::string error_msg;
+
+    inline bool
+    success(void) const {
+        return state == execute_result::success;
+    }
+    inline bool
+    error(void) const {
+        return not success();
+    }
+};
+
+//! Empty query result for when we just want to return the status
+//! of the request with no associated data
+template <>
+struct query_result<void> {
+    execute_result state;
+    std::string error_msg;
+
+    inline bool
+    success(void) const {
+        return state == execute_result::success;
+    }
+    inline bool
+    error(void) const {
+        return not success();
+    }
+};
+typedef query_result<void> empty_result;
+
+} //! mysql
+
+} //! cameradar
+
+} //! etix