use io.BytesIO instead of writing images to disk

draw.py

@@ -1,5 +1,6 @@
 import hanabi
 from PIL import Image, ImageDraw, ImageFont
+import io
 
 def rounded_rectangle(image: ImageDraw, xy, corner_radius, fill=None, outline=None):
     upper_left_point = xy[0]
@@ -77,7 +78,7 @@ def render_card_friend(image, x, y, color, value):
     # if color == 'black': text_fill = (255, 255, 255)
     image.text((x + width/2.5, y + height/8), value, font=text_font, fill=text_fill)
 
-def draw_board_state(game, player_viewing, filename):
+def draw_board_state(game, player_viewing):
     width = int(400 / size)
     height = (width * 16) // 9
     if len(game.players) == 4:
@@ -196,8 +197,10 @@ def draw_board_state(game, player_viewing, filename):
     if len(game.players) < 4: y -= 50/size
     else: y -= 40/size
     draw.text((x, y), game.last_action_description, font=text_font, fill=text_fill)
-
-    image.save(filename)
+    image_file = io.BytesIO()
+    image.save(image_file, "PNG")
+    image_file.seek(0)
+    return image_file
 
 if __name__ == '__main__':
     game = hanabi.Game(['Giacomo', 'Gabriele', 'Fabrizio'])
@@ -213,4 +216,6 @@ def draw_board_state(game, player_viewing, filename):
     # game.hands['Giacomo'][0].is_value_known = True
     # game.hands['Giacomo'][0].not_values = [1, 2, 3]
     # game.hands['Giacomo'][0].not_colors = ['red', 'blue', 'green']
-    draw_board_state(game, 'Giacomo', 'image.png')
+    image = draw_board_state(game, 'Giacomo')
+    with open('image.png', 'wb') as f:
+        f.write(image.read())

hanabi.py

@@ -398,7 +398,9 @@ def main():
 
     while True:
         # print_board_state(game, game.players[game.active_player])
-        draw.draw_board_state(game, game.players[game.active_player], 'image.png')
+        image = draw.draw_board_state(game, game.players[game.active_player])
+        with open('image.png', 'wb') as f:
+            f.write(image.read())
 
         result = check_state(game)
         if result > 0:

main.py

@@ -54,12 +54,9 @@ def add_player(server, chat_id, user_id, name, allow_repeated_players=False):
 
 def send_game_views(bot, chat_game, last_player=''):
     for name, user_id in chat_game.player_to_user.items():
-        # TODO: Send directly generated image, without write to disk.
-        filename = str(user_id) + '.png'
-        draw.draw_board_state(chat_game.game, name, filename)
+        image = draw.draw_board_state(chat_game.game, name)
         try:
-            with open(filename, 'rb') as image:
-                bot.sendPhoto(user_id, image)
+            bot.sendPhoto(user_id, image)
         except Exception as ex:
             print(ex)
             pass
@@ -173,11 +170,9 @@ def handle_game_ending(bot, chat_game):
     send_game_views(bot, chat_game)
     chat_id = chat_game.chat_id
     game = chat_game.game
-    filename = str(chat_id) + '.png'
-    draw.draw_board_state(chat_game.game, '', filename)
+    image = draw.draw_board_state(chat_game.game)
     try:
-        with open(filename, 'rb') as image:
-            bot.sendPhoto(chat_id, image)
+        bot.sendPhoto(chat_id, image)
     except Exception as ex:
         print(ex)
 

todo.md

@@ -1,7 +1,6 @@
 # Todo
 
 ## Chatbot
-- Send image without writing to disk.
 - Dump memory to disk in order to resurrect games after crashes or disconnections
 
 ## Rendering