adding chapter 7 source code

Chapter7/asyncio/asyncio_casestudy.py

@@ -0,0 +1,62 @@
+#asyncio_casestudy.py
+import asyncio
+import time
+
+import aiofiles, aiohttp
+from getfilelistpy import getfilelist
+
+TASK_POOL_SIZE = 10
+
+#update the resource object as per your API key and the gdriver folder id
+resource = {
+    "api_key": "AIzaSyDYKmm85keqnk41DpYa2bxddKrGns4z0",
+    "id": "0B8TxHW2Ci6dbckVweTRlV3RUU",
+    "fields": "files(name,id,webContentLink)",
+}
+
+async def mydownloader(name, queue):
+    while True:
+        # Get the file id and name from the queue
+        item = await queue.get()
+        try:
+            async with aiohttp.ClientSession(connector=aiohttp.TCPConnector(ssl=False)) as session:
+                async with session.get(item['webContentLink']) as resp:
+                    if resp.status == 200:
+                        f = await aiofiles.open('./files/{}'.format(
+                            item['name']), mode='wb')
+                        await f.write(await resp.read())
+                        await f.close()
+        finally:
+            print(f"{name}: Download completed for ",item['name'])
+            queue.task_done()
+
+def get_files(resource):
+    res = getfilelist.GetFileList(resource)
+    files_list = res['fileList'][0]
+    return files_list
+
+async def main ():
+    files = get_files(resource)
+    #add files info into the queue
+    myqueue = asyncio.Queue()
+    for item in files['files']:
+        myqueue.put_nowait(item)
+
+    tasks = []
+    for id in range(TASK_POOL_SIZE):
+        task = asyncio.create_task(
+            mydownloader(f'Task-{id+1}', myqueue))
+        tasks.append(task)
+
+    start_time = time.monotonic()
+    await myqueue.join()
+    total_exec_time = time.monotonic() - start_time
+
+    for task in tasks:
+        task.cancel()
+
+    await asyncio.gather(*tasks, return_exceptions=True)
+
+    print(f'Time taken to download: {total_exec_time:.2f} seconds')
+
+asyncio.run(main())