op-sync-tester: eth namespace relay

[pcw109550]

Description

Fully implement the eth namespace, validating with unit tests.

Adds ReadOnlyELBackend interface to wrap around ethclient.Client, for ensuring we are calling only the read only rpcs and ease of testing.

Sync Tester backend will access the EL through ReadOnlyELBackend, and eth namespace APIs is used to craft the appropriate response.

Generalized the Session state as

type Session struct {
	SessionID string

	// Canonical view of the chain
	CurrentState FCUState

	InitialState FCUState
}

type FCUState struct {
	Latest    uint64
	Safe      uint64
	Finalized uint64
}

To hold the initial fcu state and the current fcu state. eth rpcs will use the current fcu state to decide to relay or not.

Block labels (latest, safe, finalized) is handled.

Tests

Unit test for eth_getBlockReceipts, eth_getBlockByHash, eth_getBlockByNumber added.

Additional context

We need correctness of relay for both eth / engine namespace for proper sync. Worth to validate each namespace using unit tests, and this PR for eth.

Metadata

• May close op-sync-tester: Support eth namespace #16700

[codecov]

Codecov Report

❌ Patch coverage is 7.47664% with 99 lines in your changes missing coverage. Please review.
✅ Project coverage is 8.23%. Comparing base (f207738) to head (fa49d11).
⚠️ Report is 9 commits behind head on develop.

Files with missing lines	Patch %	Lines
op-sync-tester/synctester/backend/sync_tester.go	9.87%	73 Missing ⚠️
op-sync-tester/synctester/backend/el_reader.go	0.00%	26 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (f207738) and HEAD (fa49d11). Click for more details.

HEAD has 4 uploads less than BASE

Flag	BASE (f207738)	HEAD (fa49d11)
cannon-go-tests-64	2	0
contracts-bedrock-tests	2	0

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #17117       +/-   ##
============================================
- Coverage    45.71%    8.23%   -37.49%     
============================================
  Files         1478        3     -1475     
  Lines       119947      255   -119692     
============================================
- Hits         54837       21    -54816     
+ Misses       61263      234    -61029     
+ Partials      3847        0     -3847     

Flag	Coverage Δ
cannon-go-tests-64	?
contracts-bedrock-tests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
op-sync-tester/synctester/backend/backend.go	4.83% <ø> (-50.00%)	⬇️
op-sync-tester/synctester/backend/el_reader.go	0.00% <0.00%> (ø)
op-sync-tester/synctester/backend/sync_tester.go	10.77% <9.87%> (+0.68%)	⬆️

... and 1476 files with indirect coverage changes

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