feat(import): simpler import + state restore logic #625
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The pipeline code has been removed in favor of a simpler chain-of-responsibility approach, using `evaluateChain` and `asyncSelect`. `evaluateChain` is responsible for evaluating a data source against a chain of import handlers until one of them returns a new data source. To keep processing a data source like how the old pipeline code supported nested executions, `evaluateChain` is invoked inside a loop for every data source. `asyncSelect` is used to drive the loop execution, seleting `evaluateChain` promises whenever they are done. The state schema is updated to generically operate on serialized data sources. Instead of special-casing for remote files, the serialized DataSource type encodes this state.
DataSource objects now represent a single type, rather than the bag-of-types done originally.
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feat(DataSource): simplified data structure
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@PaulHax FYI I'm merging these changes into streaming-base and working off of that. |
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This commit contains two changes that probably can be split up into two separate PRs that can be applied to the base branch. I'm putting this up as a draft for now so @PaulHax can get a sense of the changes.
The pipeline code has been removed in favor of a simpler chain-of-responsibility approach, using
evaluateChainandasyncSelect.evaluateChainis responsible for evaluating a data source against a chain of import handlers until one of them returns a new data source.To keep processing a data source like how the old pipeline code supported nested executions,
evaluateChainis invoked inside a loop for every data source.asyncSelectis used to drive the loop execution, seletingevaluateChainpromises whenever they are done.The state schema is updated to generically operate on serialized data sources. Instead of special-casing for remote files, the serialized DataSource type encodes this state.