First server executable

helpers.h

@@ -0,0 +1,34 @@
+#ifndef HELPERS_H_
+#define HELPERS_H_
+
+#include <iostream>
+#include <string>
+
+#include <stdint.h>
+
+#include "json.hpp"
+
+
+// Reads configuration json from supplied filename
+// cfg - output json
+// filename - filepath from which to read json
+// log - ostream to log human readable errors to - can be nullptr
+// Returns - true if read and parse is successful
+bool read_config_json(nlohmann::json& cfg, const std::string& filename, std::ostream* log);
+
+// Reads configuration json from supplied istream
+// cfg - output json
+// in - istream from which to read json
+// log - ostream to log human readable errors to - can be nullptr
+// Returns - true if read and parse is successful
+bool read_config_json(nlohmann::json& cfg, std::istream& in, std::ostream* log);
+
+// JSON Extraction Helpers
+// out value is modified only if an extraction happened
+// Returns - whether an extraction happened
+bool json_extract(const nlohmann::json& j, const std::string& key, std::string& out);
+bool json_extract(const nlohmann::json& j, const std::string& key, int& out);
+bool json_extract(const nlohmann::json& j, const std::string& key, bool& out);
+bool json_extract(const nlohmann::json& j, const std::string& key, uint16_t& out);
+
+#endif // HELPERS_H_