feat: index genesis transactions

[n0izn0iz]

Depends on gnolang/gno#1941

[jefft0]

Related to gnolang/gno#1941

[zivkovicmilos]

@n0izn0iz
I think you can just add a special "genesis" fetch before we start the main run routines for fetching blocks / block result chunks, since for the genesis block we only need the block results (block 0 is unfetchable) as part of gnolang/gno#1941

[n0izn0iz]

agree, would simplify, was planning on doing that

[n0izn0iz]

added tests in 763c68a

[ajnavarro]

Please, check the tests. Mocks are used to simulate dependencies our system interacts with. This helps us focus on testing the real functionality without checking the mock itself.

To make sure our tests are testing what is needed, we need to test not just the happy path but also different possible errors. Here are some scenarios we should include:

• Remote Server Failure: What happens if the remote server fails? We need to make sure our system handles server issues properly.
• Genesis Retrieval Issues: What happens if the genesis data can’t be retrieved? This could be due to network problems, data corruption, or other issues.
• Unexpected Genesis Object Type: What happens if the genesis object is not the expected type? Type mismatches can cause unexpected behavior, so our tests should check how the system deals with this.

These scenarios are important, but we should also think of other possible cases to ensure our system is robust and reliable.

[n0izn0iz]

improved tests in 0a31d61

it helped me catch nil deref corner cases, thanks

[zivkovicmilos]

Looking at the implementation now, I think we made a right choice in the relevant gno genesis PR 👍

I've left a few comments that should be addressed before we merge, but nothing groundbreaking 🙏

[n0izn0iz]

there is one remaining problem, maybe the indexer should ignore genesis result if the node returns the well known "height must be greater than 0" otherwise we can't index test4 anymore

btw just saw that test3 returns "Height must be greater than 0" (yes the error message lost capitalization on "height" in test4)

[zivkovicmilos]

@n0izn0iz I'll fix up the tests on this branch 🙏

[zivkovicmilos]

@n0izn0iz

I think we got the PR to a working state -- but there is a problem:

The indexer will break for networks that don't have the genesis results in their storage.

I've circumvented this problem by providing the genesis state fetch error as a soft one, which doesn't derail the indexer:
ca459d3

[zivkovicmilos]

Thank you for the fixup 🙏

[ajnavarro]

Tested locally, it won't break current indexes.