pg: Add postgres support

Supports migrations

Change-Id: Ifca8358d4f57a4b417f1d972e400e98767e01bb5

1 files changed, 76 insertions, 0 deletions

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;
+    }
+
+}