Nitro validation client connects to the Rust validation server

[pmikolajczyk41]

Since the Nitro validation client uses JSON RPC communication, we actually have to abandon nice HTTP path-based routing in favor of a single root dispatcher, that inspects the method field in the JSON RPC envelope.

This PR makes necessary changes and adds a system test, where we create a validation client object (Nitro native component) connected to a running Rust validation service and ensure that the two communicate properly.

Next steps:

• add a system test for validating a block using the Rust validation server
• consider migrating from axum to a simpler jsonrpsee (dedicated for JSON RPC) server backend; this is not critical, because axum works well and has nice integrations (e.g. for tracing), but we actually don't need all its capabilities

---

closes NIT-4594

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.70%. Comparing base (b9b3864) to head (8445d14).
⚠️ Report is 64 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4450      +/-   ##
==========================================
+ Coverage   32.72%   34.70%   +1.98%     
==========================================
  Files         493      493              
  Lines       58290    58290              
==========================================
+ Hits        19076    20231    +1155     
+ Misses      35868    34475    -1393     
- Partials     3346     3584     +238     

[github-actions]

❌ 11 Tests Failed:

Tests completed	Failed	Passed	Skipped
4301	11	4290	0

View the top 3 failed tests by shortest run time

TestNitroNodeVersionAlerter

Stack Traces | 1.870s run time

... [CONTENT TRUNCATED: Keeping last 20 lines]
INFO [03-04|10:00:05.140] Persisted trie from memory database      nodes=0   flushnodes=0 size=0.00B     flushsize=0.00B time=862ns        flushtime=0s gcnodes=0 gcsize=0.00B gctime=0s         livenodes=0   livesize=0.00B
INFO [03-04|10:00:05.140] Blockchain stopped
INFO [03-04|10:00:05.147] Starting work on payload                 id=0x032dee08a7d8221a
INFO [03-04|10:00:05.151] Submitted contract creation              hash=0xcb3b145beaa11bc4d864d5b1a402f8072db7623ef91f7c215a283f82a62d892a from=0x57Ff0F473737a1c161bfF9efDF016F7991585088 nonce=18 contract=0x548c9E48e32748F36CD0265E6e6359e20c2432FA value=0
INFO [03-04|10:00:05.151] Deploying admin logic contracts
�[90mhostio-test: len 13.80K vs 50.42K�[0;0m
INFO [03-04|10:00:05.155] Submitted transaction                    hash=0x60e0b638226cd50c2dce60dd90b7b9de9abb3ae104bc2d3c6e428302ea318e8f from=0x26E554a8acF9003b83495c7f45F06edCB803d4e3 nonce=9  recipient=0x3a0a61C11D96F5B8c1492bEaA5bDAedefFff15E8 value=0
INFO [03-04|10:00:05.159] Updated payload                          id=0x032dee08a7d8221a number=21 hash=cb6ab5..ba9e5c txs=1  withdrawals=0 gas=5,156,618  fees=5.156618e-06  root=7b3195..ccc9ce elapsed=11.340ms
INFO [03-04|10:00:05.163] Stopping work on payload                 id=0x032dee08a7d8221a reason=delivery
INFO [03-04|10:00:05.164] InboxTracker                             sequencerBatchCount=2 messageCount=2  l1Block=28 l1Timestamp=2026-03-04T10:00:03+0000
INFO [03-04|10:00:05.165] Imported new potential chain segment     number=21 hash=cb6ab5..ba9e5c blocks=1  txs=1  mgas=5.157  elapsed=4.880ms     mgasps=1056.582 triediffs=75.96KiB  triedirty=0.00B
INFO [03-04|10:00:05.166] Chain head was updated                   number=21 hash=cb6ab5..ba9e5c root=7b3195..ccc9ce elapsed="421.103µs"
INFO [03-04|10:00:05.168] Starting work on payload                 id=0x03685135851881ee
INFO [03-04|10:00:05.169] Updated payload                          id=0x03685135851881ee number=22 hash=99e461..b43bfc txs=0  withdrawals=0 gas=0          fees=0             root=8f1877..883585 elapsed="342.187µs"
INFO [03-04|10:00:05.169] Stopping work on payload                 id=0x03685135851881ee reason=delivery
INFO [03-04|10:00:05.170] Imported new potential chain segment     number=22 hash=99e461..b43bfc blocks=1  txs=0  mgas=0.000  elapsed="830.346µs" mgasps=0.000    triediffs=78.74KiB  triedirty=0.00B
INFO [03-04|10:00:05.170] Chain head was updated                   number=22 hash=99e461..b43bfc root=8f1877..883585 elapsed="38.381µs"
INFO [03-04|10:00:05.171] Log index head rendering in progress     firstblock=0 lastblock=1  processed=2  remaining=0 elapsed=3.851s
INFO [03-04|10:00:05.171] Log index head rendering finished        firstblock=0 lastblock=1  processed=2  elapsed=3.851s
--- FAIL: TestNitroNodeVersionAlerter (1.87s)

TestNitroNodeVersionAlerter

Stack Traces | 7.710s run time

... [CONTENT TRUNCATED: Keeping last 20 lines]
INFO [03-04|10:01:29.142] Stopping work on payload                 id=0x03fb77675f1966fc reason=delivery
INFO [03-04|10:01:29.142] Persisted dirty state to disk            size=4.49KiB   elapsed="322.655µs"
INFO [03-04|10:01:29.143] Blockchain stopped
INFO [03-04|10:01:29.143] Imported new potential chain segment     number=63 hash=d99dd1..e6e87b blocks=1  txs=1  mgas=0.021  elapsed=2.781ms     mgasps=7.549    triediffs=285.83KiB triedirty=0.00B
INFO [03-04|10:01:29.144] Chain head was updated                   number=63 hash=d99dd1..e6e87b root=515988..305dc6 elapsed="73.959µs"
INFO [03-04|10:01:29.146] Submitted transaction                    hash=0xef69e4f939ee449ba831a8a32a4608bb0e8e1f15ab99935e946bd671a4650b9c from=0xaF24Ca6c2831f4d4F629418b50C227DF0885613A nonce=19 recipient=0xaF24Ca6c2831f4d4F629418b50C227DF0885613A value=1
INFO [03-04|10:01:29.147] Deploying seq inbox bufferable
INFO [03-04|10:01:29.149] Starting work on payload                 id=0x03680371f0e5a477
INFO [03-04|10:01:29.150] Starting work on payload                 id=0x0391243673f54575
INFO [03-04|10:01:29.151] Updated payload                          id=0x03680371f0e5a477 number=59 hash=6411c5..5a1474 txs=1  withdrawals=0 gas=21000      fees=0.002098579089 root=888d2d..e9883a elapsed=1.066ms
INFO [03-04|10:01:29.151] Updated payload                          id=0x0391243673f54575 number=64 hash=d51ec8..f96844 txs=0  withdrawals=0 gas=0          fees=0              root=6275ce..a18263 elapsed="597.91µs"
INFO [03-04|10:01:29.151] Stopping work on payload                 id=0x0391243673f54575 reason=delivery
INFO [03-04|10:01:29.152] Stopping work on payload                 id=0x03680371f0e5a477 reason=delivery
INFO [03-04|10:01:29.153] Submitted transaction                    hash=0x33ead7ecd1a17203e1b93625e621715c665a832720fabb164491fd064902b2cb from=0xaF24Ca6c2831f4d4F629418b50C227DF0885613A nonce=24 recipient=0xaF24Ca6c2831f4d4F629418b50C227DF0885613A value=1,000,000,000,000
INFO [03-04|10:01:29.153] Imported new potential chain segment     number=64 hash=d51ec8..f96844 blocks=1  txs=0  mgas=0.000  elapsed=1.945ms     mgasps=0.000    triediffs=289.26KiB triedirty=0.00B
INFO [03-04|10:01:29.153] Chain head was updated                   number=64 hash=d51ec8..f96844 root=6275ce..a18263 elapsed="67.797µs"
INFO [03-04|10:01:29.153] Imported new potential chain segment     number=59 hash=6411c5..5a1474 blocks=1  txs=1  mgas=0.021  elapsed=2.581ms     mgasps=8.136    triediffs=294.14KiB triedirty=0.00B
INFO [03-04|10:01:29.154] Chain head was updated                   number=59 hash=6411c5..5a1474 root=888d2d..e9883a elapsed="189.485µs"
WARN [03-04|10:01:29.155] Getting file info                        dir= error="stat : no such file or directory"
--- FAIL: TestNitroNodeVersionAlerter (7.71s)

TestSequencerPriceAdjustsFrom25Gwei

Stack Traces | 8.010s run time

... [CONTENT TRUNCATED: Keeping last 20 lines]
INFO [03-04|10:00:15.652] Chain head was updated                   number=36 hash=9d26c2..2507ef root=427ab7..691fb3 elapsed="110.275µs"
INFO [03-04|10:00:15.660] Submitted transaction                    hash=0xf9c87d70bfa5a8485701e4c0e62faa71e2969f92d62b3af5a070cfe676196a1b from=0x26E554a8acF9003b83495c7f45F06edCB803d4e3 nonce=45 recipient=0x0C709F340F0BB2e361229e345B7e26999d0969Ab value=1
INFO [03-04|10:00:15.661] Submitted transaction                    hash=0xdd61f54a55166415244b19cfba314d94f859de852ba61d8bd7f37a3656308197 from=0xb386a74Dcab67b66F8AC07B4f08365d37495Dd23 nonce=16 recipient=0x8cf63Fc7416c20702562D8FB090FC4B9Ce2A4c67 value=0
INFO [03-04|10:00:15.661] DataPoster sent transaction              nonce=16 hash=dd61f5..308197 feeCap=2,846,692,140  tipCap=50,000,000    blobFeeCap=<nil> gas=161,860
INFO [03-04|10:00:15.661] BatchPoster: batch sent                  sequenceNumber=17 from=29 to=33 prevDelayed=1 currentDelayed=1 totalSegments=7  numBlobs=0
INFO [03-04|10:00:15.662] Starting work on payload                 id=0x030f12ec0d449059
INFO [03-04|10:00:15.663] Updated payload                          id=0x030f12ec0d449059 number=51 hash=2ed960..8a4a22 txs=1  withdrawals=0 gas=149,506    fees=7.4753e-06     root=29a003..0c04b5 elapsed=1.066ms
INFO [03-04|10:00:15.663] Stopping work on payload                 id=0x030f12ec0d449059 reason=delivery
INFO [03-04|10:00:15.665] Imported new potential chain segment     number=51 hash=2ed960..8a4a22 blocks=1  txs=1  mgas=0.150  elapsed=1.911ms     mgasps=78.233   triediffs=277.96KiB triedirty=0.00B
INFO [03-04|10:00:15.665] Chain head was updated                   number=51 hash=2ed960..8a4a22 root=29a003..0c04b5 elapsed="97.311µs"
INFO [03-04|10:00:15.671] Submitted transaction                    hash=0x1154d8400138eff3385eaf18f622d093d65bfc2d1acabc2bef49769334d476ce from=0x26E554a8acF9003b83495c7f45F06edCB803d4e3 nonce=46 recipient=0x0C709F340F0BB2e361229e345B7e26999d0969Ab value=1
INFO [03-04|10:00:15.681] Submitted transaction                    hash=0xd6cb1ad2fca24f61f8bdf8aacf09f69939110c3fda894c710c1a550425374c54 from=0x26E554a8acF9003b83495c7f45F06edCB803d4e3 nonce=9  recipient=0x26E554a8acF9003b83495c7f45F06edCB803d4e3 value=1
INFO [03-04|10:00:15.687] Submitted transaction                    hash=0x2149f2d9b1ecb02092c28bb8c387332de9eaf1dccf62cd95b233fada0aab541c from=0xaF24Ca6c2831f4d4F629418b50C227DF0885613A nonce=5  recipient=0xaF24Ca6c2831f4d4F629418b50C227DF0885613A value=1
INFO [03-04|10:00:15.691] Starting work on payload                 id=0x03ce45f292638490
INFO [03-04|10:00:15.692] Updated payload                          id=0x03ce45f292638490 number=40 hash=63855d..9bc0ce txs=1  withdrawals=0 gas=21000      fees=0.002082054089 root=bc4165..fe2aa3 elapsed="962.93µs"
INFO [03-04|10:00:15.693] Stopping work on payload                 id=0x03ce45f292638490 reason=delivery
INFO [03-04|10:00:15.694] Submitted transaction                    hash=0xc7f4f5e193ef9a67449c8481d8f0546eeb85aedd7ab78db9e9b44eda6b46378f from=0x26E554a8acF9003b83495c7f45F06edCB803d4e3 nonce=47 recipient=0x0C709F340F0BB2e361229e345B7e26999d0969Ab value=1
INFO [03-04|10:00:15.697] Imported new potential chain segment     number=40 hash=63855d..9bc0ce blocks=1  txs=1  mgas=0.021  elapsed=1.371ms     mgasps=15.309   triediffs=195.75KiB triedirty=0.00B
INFO [03-04|10:00:15.697] Chain head was updated                   number=40 hash=63855d..9bc0ce root=bc4165..fe2aa3 elapsed="66.794µs"
--- FAIL: TestSequencerPriceAdjustsFrom25Gwei (8.01s)

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[bragaigor]

LGTM overall, just a few minor comments

[bragaigor]

LGTM

[eljobe]

Nice. Very clear PR description that made it easier to review the code. Thanks.