From e01f6168993af377b2a625176efff95b498b5d21 Mon Sep 17 00:00:00 2001
From: Glenn Glazer <coyot@lindenlab.com>
Date: Mon, 27 Jun 2016 15:30:57 -0700
Subject: SL-323: multithreaded downloader with progress bar

---
 indra/viewer_components/manager/download_update.py | 96 ++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100755 indra/viewer_components/manager/download_update.py

diff --git a/indra/viewer_components/manager/download_update.py b/indra/viewer_components/manager/download_update.py
new file mode 100755
index 0000000000..aa8555cd21
--- /dev/null
+++ b/indra/viewer_components/manager/download_update.py
@@ -0,0 +1,96 @@
+#!/usr/bin/env python
+
+# $LicenseInfo:firstyear=2016&license=internal$
+# 
+# Copyright (c) 2016, Linden Research, Inc.
+# 
+# The following source code is PROPRIETARY AND CONFIDENTIAL. Use of
+# this source code is governed by the Linden Lab Source Code Disclosure
+# Agreement ("Agreement") previously entered between you and Linden
+# Lab. By accessing, using, copying, modifying or distributing this
+# software, you acknowledge that you have been informed of your
+# obligations under the Agreement and agree to abide by those obligations.
+# 
+# ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+# WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+# COMPLETENESS OR PERFORMANCE.
+# $LicenseInfo:firstyear=2013&license=viewerlgpl$
+# Copyright (c) 2013, Linden Research, Inc.
+# $/LicenseInfo$
+
+"""
+@file   download_update.py
+@author coyot
+@date   2016-06-23
+"""
+
+"""
+Performs a download of an update.  In a separate script from update_manager so that we can
+call it with subprocess.
+"""
+
+import argparse
+import InstallerUserMessage as IUM
+import os
+import Queue
+import requests
+import threading
+
+
+def download_update(url = None, download_dir = None, size = None, progressbar = False, chunk_size = 1024):
+    #url to download from
+    #download_dir to download to
+    #total size (for progressbar) of download
+    #progressbar: whether to display one (not used for background downloads)
+    #chunk_size is in bytes
+    #in_queue is to communicate between download_update and the thread
+    #out_queue is to communicate between the thread and the progressbar
+    #if progressbar:
+        #out_queue = Queue.Queue()
+        #buffer_thread = ThreadedBuffer(size, in_queue, out_queue)
+        #buffer_thread.start()
+        #pb_thread = ThreadedBar(size, out_queue)
+        #pb_thread.start()
+    
+    queue = Queue.Queue()
+    filename = os.path.join(download_dir, url.split('/')[-1])
+    req = requests.get(url, stream=True)
+    down_thread = ThreadedDownload(req, filename, chunk_size, progressbar, queue)
+    down_thread.start()
+    
+    if progressbar:
+        frame = IUM.InstallerUserMessage(title = "Second Life Downloader", icon_name="head-sl-logo.gif")
+        frame.progress_bar(message = "Download Progress", size = size, pb_queue = queue)
+        frame.mainloop()
+
+class ThreadedDownload(threading.Thread):
+    def __init__(self, req, filename, chunk_size, progressbar, in_queue):
+        threading.Thread.__init__(self)
+        self.req = req
+        self.filename = filename
+        self.chunk_size = int(chunk_size)
+        self.progressbar = progressbar
+        self.in_queue = in_queue
+        
+    def run(self):
+        with open(self.filename, 'wb') as fd:
+            for chunk in self.req.iter_content(self.chunk_size):
+                fd.write(chunk)
+                if self.progressbar:
+                    self.in_queue.put(len(chunk))                       
+            self.in_queue.put(-1)
+
+def main():
+    parser = argparse.ArgumentParser("Download URI to directory")
+    parser.add_argument('--url', dest='url', help='URL of file to be downloaded', required=True)
+    parser.add_argument('--dir', dest='download_dir', help='directory to be downloaded to', required=True)
+    parser.add_argument('--pb', dest='progressbar', help='whether or not to show a progressbar', action="store_true", default = False)
+    parser.add_argument('--size', dest='size', help='size of download for progressbar')
+    parser.add_argument('--chunk_size', dest='chunk_size', help='max portion size of download to be loaded in memory in bytes.')
+    args = parser.parse_args()
+
+    download_update(url = args.url, download_dir = args.download_dir, size = args.size, progressbar = args.progressbar, chunk_size = args.chunk_size)
+
+
+if __name__ == "__main__":
+    main()
-- 
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