Allow showing full country info in views

NETWORKING.md

@@ -253,6 +253,18 @@ Current players in server with ip in human readable format and time played of ea
 `*_player_stats`
 All players with online id and username with their time played stats in this server since creation of this database.
 
+A empty table named `v(server database version)_countries` will also be created in your database if not exists:
+```sql
+CREATE TABLE IF NOT EXISTS (table name above)
+(
+    country_code TEXT NOT NULL PRIMARY KEY UNIQUE, -- Unique 2-letter country code
+    country_flag TEXT NOT NULL, -- Unicode country flag representation of 2-letter country code
+    country_name TEXT NOT NULL -- Readable name of this country
+) WITHOUT ROWID;
+```
+
+If you want to see flags and readable names of countries in `*_full_stats` and `*_current_players` views, you need to initialize `v(server database version)_countries` table, check [this script](tools/generate-countries-table.py).
+
 For IP, online ID ban list or player reports, you need to create one yourself:
 ```sql
 CREATE TABLE ip_ban

src/network/protocols/server_lobby.cpp

@@ -258,6 +258,18 @@ void ServerLobby::initServerStatsTable()
     if (m_server_stats_table.empty())
         return;
 
+    // Extra default table _countries:
+    // Server owner need to initialise this table himself, check NETWORKING.md
+    std::string country_table_name = std::string("v") + StringUtils::toString(
+        ServerConfig::m_server_db_version) + "_countries";
+    query = StringUtils::insertValues(
+        "CREATE TABLE IF NOT EXISTS %s (\n"
+        "    country_code TEXT NOT NULL PRIMARY KEY UNIQUE, -- Unique 2-letter country code\n"
+        "    country_flag TEXT NOT NULL, -- Unicode country flag representation of 2-letter country code\n"
+        "    country_name TEXT NOT NULL -- Readable name of this country\n"
+        ") WITHOUT ROWID;", country_table_name.c_str());
+    easySQLQuery(query);
+
     // Default views:
     // _full_stats
     // Full stats with ip in human readable format and time played of each
@@ -269,10 +281,13 @@ void ServerLobby::initServerStatsTable()
     oss << "CREATE VIEW IF NOT EXISTS " << view_name << " AS\n"
         << "    SELECT host_id, ip,\n"
         << "    ((ip >> 24) & 255) ||'.'|| ((ip >> 16) & 255) ||'.'|| ((ip >>  8) & 255) ||'.'|| ((ip ) & 255) AS ip_readable,\n"
-        << "    port, online_id, username, player_num, country_code, version,\n"
+        << "    port, online_id, username, player_num,\n"
+        << "    " << m_server_stats_table << ".country_code AS country_code, country_flag, country_name, version,\n"
         << "    ROUND((STRFTIME(\"%s\", disconnected_time) - STRFTIME(\"%s\", connected_time)) / 60.0, 2) AS time_played,\n"
-        << "    connected_time, disconnected_time, ping\n"
+        << "    connected_time, disconnected_time, ping FROM " << m_server_stats_table << "\n"
-        << "    FROM " << m_server_stats_table << " ORDER BY connected_time DESC;";
+        << "    LEFT JOIN " << country_table_name << " ON "
+        <<      country_table_name << ".country_code = " << m_server_stats_table << ".country_code\n"
+        << "    ORDER BY connected_time DESC;";
     query = oss.str();
     easySQLQuery(query);
 
@@ -287,9 +302,12 @@ void ServerLobby::initServerStatsTable()
     oss << "CREATE VIEW IF NOT EXISTS " << view_name << " AS\n"
         << "    SELECT host_id, ip,\n"
         << "    ((ip >> 24) & 255) ||'.'|| ((ip >> 16) & 255) ||'.'|| ((ip >>  8) & 255) ||'.'|| ((ip ) & 255) AS ip_readable,\n"
-        << "    port, online_id, username, player_num, country_code, version,\n"
+        << "    port, online_id, username, player_num,\n"
+        << "    " << m_server_stats_table << ".country_code AS country_code, country_flag, country_name, version,\n"
         << "    ROUND((STRFTIME(\"%s\", 'now') - STRFTIME(\"%s\", connected_time)) / 60.0, 2) AS time_played,\n"
         << "    connected_time, ping FROM " << m_server_stats_table << "\n"
+        << "    LEFT JOIN " << country_table_name << " ON "
+        <<      country_table_name << ".country_code = " << m_server_stats_table << ".country_code\n"
         << "    WHERE connected_time = disconnected_time;";
     query = oss.str();
     easySQLQuery(query);

tools/generate-countries-table.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+
+# usage: generate-countries-table.py > countries.csv
+# in sqlite3 terminal:
+#
+# .mode csv
+# .headers off
+# .separator ";"
+# .import `full path to countries.csv` `v(database_version)_countries`
+#
+
+import csv
+import os
+import sys
+
+CSV_FILE = '../data/country_names.csv'
+# Use another name in the country_code header if you want countries names in different language
+READABLE_NAME = 'en'
+# ord("🇦") - ord("A")
+FLAG_OFFSET = 127397
+
+if not os.path.exists(CSV_FILE):
+    print("File = {} does not exist.".format(CSV_FILE))
+    sys.exit(1)
+
+with open(CSV_FILE, 'r') as csvfile:
+    country = csv.DictReader(csvfile, delimiter=';', quotechar='"')
+    # Skip header
+    next(country)
+    for row in country:
+        country_code = row['country_code']
+        codepoints = [ord(x) + FLAG_OFFSET for x in country_code]
+        print('%s;%s;%s' % (country_code, chr(codepoints[0]) + chr(codepoints[1]), row[READABLE_NAME]))