Port configuration parsing to a separate object.

Change-Id: If5da63d2fdd498dcb6dde10469acaa91b00e60df
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

2 files changed, 127 insertions, 0 deletions

diff --git a/src/utils/config-parser.cpp b/src/utils/config-parser.cpp
new file mode 100644
index 00000000..e73b0f94
--- /dev/null
+++ b/src/utils/config-parser.cpp
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2015, 2016 ,2017 "IoT.bzh"
+ * Author "Romain Forlot" <romain.forlot@iot.bzh>
+ *
+ * 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.
+ */
+
+namespace utils
+{
+	config_parser_t::config_parser_t(int conf_file)
+		: conf_file_{conf_file}, devices_name{}
+	{}
+
+	/// @brief read the conf_file_ and will parse json objects
+	/// in it searching for canbus objects devices name.
+	///
+	/// @return Vector of can bus device name string.
+	void can_bus_t::read_conf()
+	{
+		FILE *fd = fdopen(conf_file_, "r");
+		if (fd)
+		{
+			std::fseek(fd, 0, SEEK_END);
+			config_content_.resize(std::ftell(fd));
+			std::rewind(fd);
+			std::fread(&config_content_[0], 1, config_content_.size(), fd);
+			std::fclose(fd);
+
+			DEBUG(binder_interface, "Configuration file content : %s", config_content_.c_str());
+		}
+		ERROR(binder_interface, "Problem at reading the conf file");
+	}
+
+	void parse_devices_name()
+	{
+		json_object *jo, *canbus;
+		const char* taxi;
+
+		jo = json_tokener_parse(config_content_.c_str());
+
+			if (jo == NULL || !json_object_object_get_ex(jo, "canbus", &canbus))
+			{
+				ERROR(binder_interface, "Can't find canbus node in the configuration file. Please review it.");
+				devices_name_.clear();
+			}
+			else if (json_object_get_type(canbus) != json_type_array)
+			{
+				taxi = json_object_get_string(canbus);
+				DEBUG(binder_interface, "Can bus found: %s", taxi);
+				devices_name_.push_back(std::string(taxi));
+			}
+			else
+			{
+				int n, i;
+				n = json_object_array_length(canbus);
+				for (i = 0 ; i < n ; i++)
+					devices_name_.push_back(json_object_get_string(json_object_array_get_idx(canbus, i)));
+			}
+	}
+
+	/// @brief Public method to access devices_name_ vector. If vector size equal 0
+	/// then it will parses the configuration file content to fill it. It could be empty even
+	/// after parsing if content file just don't have a correct "canbus" directive so you
+	/// have to test the returned value.
+	///
+	/// @return A const vector with string of linux CAN devices.
+	const std::vector<std::string>& get_devices_name()
+	{
+		if(devices_name_.empty())
+			parse_devices_name();
+
+		return devices_name_;
+	}
+}
\ No newline at end of file
diff --git a/src/utils/config-parser.hpp b/src/utils/config-parser.hpp
new file mode 100644
index 00000000..e6bd9d22
--- /dev/null
+++ b/src/utils/config-parser.hpp
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2015, 2016 ,2017 "IoT.bzh"
+ * Author "Romain Forlot" <romain.forlot@iot.bzh>
+ *
+ * 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 <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <json-c/json.h>
+
+#include <string>
+
+namespace utils
+{
+	class config_parser_t
+	{
+	private:
+		int conf_file_; /*!< conf_file_ - file that handle the binding configuration file */
+		std::string config_content_; /*!< config_content_ - String that contains the content of config file */
+		std::vector<std::string> devices_name_; /*!< devices_name - Found devices name after reading configuration file */
+
+		void parse_devices_name();
+	public:
+		config_parser_t(int conf_file);
+
+		void read_conf();
+		std::vector<std::string> get_devices_name();
+	};
+}