dslx: introduce function to easily measure endpoints #2618
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funder/drl2022-2024
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ooni/probe-engine
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bassosimone
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This diff introduces MeasureResolvedAddresses and other ancillary functions that allow us to express measuring endpoints in a very simple way and with less code than with previous dslx code. As a result, we can deprecate a bunch of dslx functions (we will actually clean them up at a later time). While there, make StreamList simpler and more efficient: we can stream w/o creating a goroutine. It suffices to create a sufficiently buffered channel and fill it, and we can do all the work in the current goroutine. While there, fix a bug where QUICHandshake was mistakenly using the host network rather than the measuring network to create UDP listening sockets, which, well..., generated lots of confusion for me 😅 🤦. While there, make sure the netemx.MustNewScenario function creates HTTP/3 listeners for DNS servers. Previously, we did not create such listeners, which however is necessary because we very often use DoH3. While there, make sure we have issues for upcoming work. Closes ooni/probe#2618.
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Feb 13, 2024
This diff introduces MeasureResolvedAddresses and other ancillary functions that allow us to express measuring endpoints in a very simple way and with less code than with previous dslx code. As a result, we can deprecate a bunch of dslx functions (we will actually clean them up at a later time). While there, make StreamList simpler and more efficient: we can stream w/o creating a goroutine. It suffices to create a sufficiently buffered channel and fill it, and we can do all the work in the current goroutine. While there, fix a bug where QUICHandshake was mistakenly using the host network rather than the measuring network to create UDP listening sockets, which, well..., generated lots of confusion for me 😅 🤦. While there, make sure the netemx.MustNewScenario function creates HTTP/3 listeners for DNS servers. Previously, we did not create such listeners, which however is necessary because we very often use DoH3. While there, make sure we have issues for upcoming work. Closes ooni/probe#2618.
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Measuring endpoints is still a bit difficult to do with dslx. Let us introduce a function to measure endpoints that allows us to write simple code to perform this task. Ideally, we would like to be able to "pipe" the results of the DNS lookup step(s) directly into such a function to obtain endpoint measurements.
The overall objective here is to cleanup and review dslx, then start using it in production and rewrite experiments using it. In turn, by doing that, we'll enable collecting better throttling metrics for experiments.
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