Get rid of asyncio

No point in using it when it only delegates to a ThreadPoolExecutor anyway.

ia-upload-stream

@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 # Only external dependency: requests
 import argparse
-import asyncio
 import base64
 import collections
 import concurrent.futures
@@ -176,10 +175,12 @@ def upload_one(url, uploadId, partNumber, data, contentMd5, size, headers, progr
 	return partNumber, r.headers['ETag']
 
 
-async def wait_first(tasks, parts):
+def wait_first(tasks, parts):
 	task = tasks.popleft()
+	done, _ = concurrent.futures.wait({task})
+	assert task in done
 	try:
-		partNumber, eTag = await task
+		partNumber, eTag = task.result()
 	except UploadError as e:
 		# The upload task can't add an accurate parts list, so add that here and reraise
 		e.parts = parts
@@ -188,7 +189,7 @@ async def wait_first(tasks, parts):
 	logger.info(f'Upload of part {partNumber} OK, ETag: {eTag}')
 
 
-async def upload(item, filename, metadata, *, iaConfigFile = None, partSize = 100*1024*1024, tries = 3, concurrency = 1, queueDerive = True, keepOldVersion = True, complete = True, uploadId = None, parts = None, progress = True):
+def upload(item, filename, metadata, *, iaConfigFile = None, partSize = 100*1024*1024, tries = 3, concurrency = 1, queueDerive = True, keepOldVersion = True, complete = True, uploadId = None, parts = None, progress = True):
 	f = sys.stdin.buffer
 
 	# Read `ia` config
@@ -215,11 +216,10 @@ async def upload(item, filename, metadata, *, iaConfigFile = None, partSize = 10
 	if parts is None:
 		parts = []
 	tasks = collections.deque()
-	loop = asyncio.get_event_loop()
 	with concurrent.futures.ThreadPoolExecutor(max_workers = concurrency) as executor:
 		for partNumber in itertools.count(start = len(parts) + 1):
 			while len(tasks) >= concurrency:
-				await wait_first(tasks, parts)
+				wait_first(tasks, parts)
 			data = io.BytesIO()
 			with maybe_file_progress_bar(progress, data, 'write', 'reading input') as w:
 				readinto_size_limit(f, w, partSize)
@@ -234,10 +234,10 @@ async def upload(item, filename, metadata, *, iaConfigFile = None, partSize = 10
 			logger.info(f'MD5: {h.hexdigest()}')
 			contentMd5 = base64.b64encode(h.digest()).decode('ascii')
 
-			task = loop.run_in_executor(executor, upload_one, url, uploadId, partNumber, data, contentMd5, size, headers, progress, tries)
+			task = executor.submit(upload_one, url, uploadId, partNumber, data, contentMd5, size, headers, progress, tries)
 			tasks.append(task)
 	while tasks:
-		await wait_first(tasks, parts)
+		wait_first(tasks, parts)
 
 	# If --no-complete is used, raise the special error to be caught in main for pretty printing.
 	if not complete:
@@ -337,7 +337,7 @@ def main():
 	logging.basicConfig(level = logging.INFO, format = '{asctime}.{msecs:03.0f}  {levelname}  {name}  {message}', datefmt = '%Y-%m-%d %H:%M:%S', style = '{')
 	try:
 		if not args.abort:
-			asyncio.run(upload(
+			upload(
 				args.item,
 				args.filename,
 				args.metadata,
@@ -351,7 +351,7 @@ def main():
 				uploadId = args.uploadId,
 				parts = args.parts,
 				progress = args.progress,
-			))
+			)
 		else:
 			abort(
 				args.item,