pg: Add postgres support

Supports migrations

Change-Id: Ifca8358d4f57a4b417f1d972e400e98767e01bb5

3 files changed, 128 insertions, 1 deletions

diff --git a/src/bot.cpp b/src/bot.cpp
index 03bea02..ad818a0 100644
--- a/src/bot.cpp
+++ b/src/bot.cpp
@@ -1,21 +1,72 @@
 
 #include <dpp/snowflake.h>
 #include <stdlib.h>
+#include <string>
 #include <142bot/bot.hpp>
 #include <dpp/dpp.h>
 #include <142bot/modules.hpp>
 #include <142bot/util.hpp>
 #include <fmt/format.h>
 #include <fmt/format-inl.h>
+#include <pqxx/pqxx>
+#include <142bot/db.hpp>
+#include <filesystem>
+
+namespace fs = std::filesystem;
 
 Bot::Bot(bool devel, dpp::cluster* cluster) {
     dev = devel;
     this->core = cluster;
+ 
+    std::ifstream f("config.json");
+    json cfg = json::parse(f);
+    std::string token = cfg.value("token", "bad-token");
+
+	this->conn = db::connect(cfg["postgres"]["host"], cfg["postgres"]["user"], cfg["postgres"]["pass"], cfg["postgres"]["database"], cfg["postgres"]["port"]);
+
+	run_database_migrations();
+
     this->loader = new ModuleLoader(this);
 	this->loader->load_all();
 //    this->loader->LoadAll();
 }
 
+/**
+ * Attempts to run migrations stored in a directory local to CWD.
+ * 
+ * Returns false on any error
+*/
+bool Bot::run_database_migrations() {
+
+	// Start a transaction
+	this->core->log(dpp::ll_info, "Attempting database migrations...");
+	pqxx::work w(this->conn);
+	// Get all files in ./migrations
+	std::string path = "./migrations";
+	for (const auto &entry : fs::directory_iterator(path)) {
+		std::ifstream f(entry.path());
+		std::ostringstream sstr;
+		sstr << f.rdbuf();
+		std::string stmt = sstr.str();
+
+		this->core->log(dpp::ll_debug, fmt::format("Attempting to migrate database with statement {}", stmt));
+
+		try {
+			w.exec0(stmt);
+		} catch (std::exception &e) {
+			w.abort();
+			this->core->log(dpp::ll_error, e.what());
+			return false;
+		}
+		
+	}
+
+	w.commit();
+	this->core->log(dpp::ll_info, "Done.");
+
+	return true;
+}
+
 bool Bot::isDevMode() {
     return dev;
 }
diff --git a/src/db.cpp b/src/db.cpp
new file mode 100644
index 0000000..92e3d1d
--- /dev/null
+++ b/src/db.cpp
@@ -0,0 +1,76 @@
+/*
+ * =====================================================================================
+ *
+ *       Filename:  db.cpp
+ *
+ *    Description:  Connection to a postgres database 
+ *
+ *        Version:  1.0
+ *        Created:  04/06/2023 11:40:39 AM
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  Cara Salter (muirrum), cara@devcara.com
+ *   Organization:  Worcester Polytechnic Institute
+ *
+ * =====================================================================================
+ */
+#include <fmt/core.h>
+#include <mutex>
+#include <stdlib.h>
+#include <stdio.h>
+#include <iostream>
+#include <142bot/db.hpp>
+#include <pqxx/pqxx>
+#include <fmt/format.h>
+#include <cstdarg>
+
+using namespace std;
+
+namespace db { 
+    std::mutex db_mutex;
+    std::string _error;
+
+    /**
+     * Connects to a postgres database, returns false if error
+     **/
+    pqxx::connection connect(const std::string &host, const std::string &user, const std::string &pass, const std::string &db, int port) {
+        std::lock_guard<std::mutex> db_lock(db_mutex);
+        
+        std::string cn_s = "postgresql://";
+
+        if (!user.empty()) {
+            cn_s = cn_s + user;
+        }
+        if (!pass.empty() && !user.empty()) {
+            cn_s = cn_s + ":" + pass;
+        }
+
+        if ((!user.empty() || !pass.empty())) {
+            cn_s = cn_s + "@";
+        }
+
+        if (!host.empty()) {
+            cn_s = cn_s + "localhost";
+        }
+        if (port != 0 && !host.empty()) {
+            cn_s = cn_s + ":" + std::to_string(port);
+        }
+        if (!db.empty()) {
+            cn_s = cn_s + "/" + db;
+        } 
+
+        try {
+            pqxx::connection c{cn_s};
+            return c;
+        } catch (std::exception const &e) {
+            _error = e.what();
+            throw e;
+        }
+    }
+
+    const std::string& error() {
+        return _error;
+    }
+
+}
diff --git a/src/main.cpp b/src/main.cpp
index 8f3ad9a..f54e418 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,6 +1,7 @@
 #include <dpp/dpp.h>
 #include <dpp/json.h>
 #include <142bot/bot.hpp>
+#include <142bot/db.hpp>
 
 #include <spdlog/spdlog.h>
 #include <spdlog/async.h>
@@ -17,7 +18,6 @@ int main(int argc, char const *argv[]) {
     std::ifstream f("config.json");
     json cfg = json::parse(f);
     string token = cfg.value("token", "bad-token");
-
     dpp::cluster bot(token, dpp::intents::i_all_intents);
 
 		std::shared_ptr<spdlog::logger> log;