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lib/httpserver/sendfile.py

@@ -0,0 +1,25 @@
+# Memory efficient file transfer
+#
+# Copyright 2021 (c) Erik de Lange
+# Released under MIT license
+
+_buffer = bytearray(512)  # adjust size to your systems available memory
+_bmview = memoryview(_buffer)  # reuse pre-allocated _buffer
+
+
+def sendfile(conn, filename):
+    """ Send a file to a connection in chunks - lowering memory usage.
+
+    :param socket conn: connection to send the file content to
+    :param str filename: name of file the send
+    """
+    try:
+        with open(filename, "rb") as fp:
+            while True:
+                n = fp.readinto(_buffer)
+                if n == 0:
+                    break
+                conn.write(_bmview[:n])
+    except:
+        print(f"WEB:File {filename} not found")
+