[SERVER-58915] Implement ReshardingDonorWriteRouter functionality along with unit tests - MongoDB Jira

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Backwards Compatibility:
Fully Compatible
Backport Requested:

v5.1, v5.0
Sprint:
Sharding 2021-08-09, Sharding 2021-09-06, Sharding 2021-09-20, Sharding 2021-10-04, Sharding 2021-10-18
Linked BF Score:
0
Story Points:
1

Tasks for this ticket

Implement the constructors and getters in the class.
- getDestinedRecipient should follow the behavior already defined in the free-standing function here. Note that many of the variables retrieved here will now already exist on the ReshardingDonorWriteRouter class.
- As part of implementing getDestinedRecipient, use TypeCollectionDonorFields::getTempReshardingNss() rather than calling constructTemporaryReshardingNss(). This is because the donor fields will already have the name constructed, so there's no need to re-calculate it.

Change this unit test to test your new class instead of the free-standing getDestinedRecipient() function. The devil is in the details here – if this is intimidating reach out to blake.oler to walk through how this would be done.

has to be done after

SERVER-58914 Create ReshardingDonorWriteRouter class with function stubs

has to be done before

SERVER-58918 Replace getDestinedRecipient() in the code-base with calls into the ReshardingDonorWriteRouter object

is duplicated by

SERVER-57666 Convert getDestinedRecipient() in resharding_util to be a class method

SERVER-58918 Replace getDestinedRecipient() in the code-base with calls into the ReshardingDonorWriteRouter object