cleanup(dslx): use model.UnderlyingNetwork for testing #1377
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We want to use the DSL inside the oohelperd. We don't care about collecting observations in the oohelperd. So, the plan is that of abstracting the ConnPool, renaming it Runtime, and giving it the power to create abstract Traces. The oohelperd will use a MinimalRuntime (sketched out by this commit) that will not collect any observation. Measuring code, instead, will use a MeasurexRuntime that will collect observations. This commit is just the first step. We rename and introduce the MinimalRuntime. No significant functional changes so far.
Rather than using custom fields for testing, we can configure in the runtime a custom model.MeasuringNetwork. We're not doing this just to simplify the codebase, rather the underlying intent here is making sure we don't need to keep much state in each function, so we can refactor them to be pure functions wrapped by an adapter that produces the desired type. In turn, by doing that, we will be able to factor complexity around invoking functions and parsing their results. In turn, by doing that, we will be able to modify the signature of the functions and do the following: 1. allow the DSL model to include stages that take in input a Maybe value rather than a value, so we can observe failures more easily than we do now and we can write inline code to save into test keys; 2. allow the DSL model to much more easily be refactored to use channels, which in turn enables us to compose operations more naturally and increase the amount of overlapping (think, e.g., how this enables the possibility of waiting additional time for a DNS-over-UDP resolver to wait for late/duplicate replies).
This diff modifies dslx functions to always use the MeasuringNetwork for testing rather than using specific func fields. By doing this, we open up the possibility of simplifying the state of each func, with the ultimate goal of making them pure functions. By making them pure functions, we make the code more manageable and easy to modify, which opens up for additional refactorings.
This reverts commit 3b41a24.
bassosimone
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Feb 13, 2024
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Closes ooni/probe#2582