http: use current Tornado IOLoop when stopping. (Fixes #1715). #1716
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jodal
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Oct 21, 2018
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Yep I did a few tests on both tornado 5 and 4.4, seems fine. |
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Maybe target this for the |
This is in response to the breaking change in Tornado v5.0 where IOLoop.instance is now a deprecated alias for IOLoop.current. More info at https://www.tornadoweb.org/en/stable/releases/v5.0.0.html
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In Tornado 4.x and earlier, IOLoop.current() would return the global IOLoop if there was no IOLoop already running in the calling thread. This was the case when calling our websocket broadcast method from the HttpFrontend thread and so callbacks were correctly scheduled on the HttpServer thread's IOLoop. However, in Tornado 5.0+, the idea of a global IOLoop is gone and calling IOLoop.current() will simply create a new IOLoop if there isn't one already running in the calling thread. This incorrectly resulted in callbacks being scheduled on that new IOLoop which is never actually started and so the broadcasts were never sent. This is related to mopidy#1716.
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In Tornado 4.x and earlier, IOLoop.current() would return the global IOLoop if there was no IOLoop already running in the calling thread. This was the case when calling our websocket broadcast method from the HttpFrontend thread and so callbacks were correctly scheduled on the HttpServer thread's IOLoop. However, in Tornado 5.0+, the idea of a global IOLoop is gone and calling IOLoop.current() will simply create a new IOLoop if there isn't one already running in the calling thread. This incorrectly resulted in callbacks being scheduled on that new IOLoop which is never actually started and so the broadcasts were never sent. This is related to #1716.
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In Tornado 4.x and earlier, IOLoop.current() would return the global IOLoop if there was no IOLoop already running in the calling thread. This was the case when calling our websocket broadcast method from the HttpFrontend thread and so callbacks were correctly scheduled on the HttpServer thread's IOLoop. However, in Tornado 5.0+, the idea of a global IOLoop is gone and calling IOLoop.current() will simply create a new IOLoop if there isn't one already running in the calling thread. This incorrectly resulted in callbacks being scheduled on that new IOLoop which is never actually started and so the broadcasts were never sent. This is related to #1716. (cherry picked from commit 59a3935)
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From Tornado v5.0:
We were using IOLoop.instance to stop the HTTP server thread from a different thread.