op-node: Cleanup calldata source API

[trianglesphere]

Description

This provides a new set of objects which provide the following API guarantees:

• The opening of a data for a new L1 block will never fail.
• If it failed to get transactions, it does so in the calls to Next.

This greatly simplifies usage of this object when constructing new data. If the node did not keep track of the internal state, the external users of this API would have to keep track of this state in a more complex way.

Tests

Please describe any tests you've added. If you've added no tests, or left important behavior untested, please explain why not.

Additional context

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Metadata

• Fixes ENG-2746

[mergify[bot]]

This PR changes implementation code, but doesn't include a changeset. Did you forget to add one?

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⚠️ No Changeset found

Latest commit: 8e611a03f9507a563e924e0ae7233db584c02b52

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[mergify[bot]]

This PR has been added to the merge queue, and will be merged soon.

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This PR is next in line to be merged, and will be merged as soon as checks pass.