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Added a note about concurrency

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This commit is contained in:
Joel Collins 2020-03-15 16:30:34 +00:00
parent 6092e8ab5d
commit 414be0405e
1 changed files with 10 additions and 1 deletions
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11
openflexure_microscope/api/v2/views/streams.py
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@ -18,7 +18,16 @@ class MjpegStream(View):
@doc_response(200, mimetype="multipart/x-mixed-replace")
def get(self):
"""
MJPEG stream from the microscope camera
MJPEG stream from the microscope camera.
Note: While the code actually getting frame data from a camera and storing it in
camera.frame runs in a thread, the gen(microscope.camera) generator does not.
This response is therefore blocking. The generator just yields the most recent
frame from the camera object, passed to the Flask response, and then repeats until
the connection is closed.
Without monkey patching with gevent, or using a native threaded server, the stream
will block all proceeding requests.
"""
microscope = find_component("org.openflexure.microscope")
# Restart stream worker thread