Tx evaluation #378

ginnun · 2025-09-12T10:03:16Z

Implements #306

The goal of this PR is to implement tx evaluation APIs while trying to stay compatible to the Blockfrost.io version, which are:

/utils/txs/evaluate
/utils/txs/evaluate/utxos

What is added

Two new endpoints and tests under a new compile configuration: evaluate
New cardano node client functions related to ledger: protocol_params and genesis_config
pallas_validate handling
Native tx evaluation in Rust using pallas (incomplete)
External tx evaluation in Haskell using ledger via a compiled binary

What is changed

Test folder layout. Now we can have separate files for each endpoint tests. This makes sense since we are going to have lots of them.
Underlying commit of the pallas tag. I ended up fixing a non-working part in pallas. So changed the hash of the tag. (I want to use tagging better in the future)
cargo.lock file content

Considerations

I am getting the protocol params and genesis from the Cardano node every time. This can be changed to use the new static implementation (or cached)
The build configuration evaluate will be built by default except windows and linux-aarch64 platforms (handled in build.rs).
The build configuration evaluate enables tx evaluation endpoints. It exists since pallat-validate crate isn't building for windows-all and linux-aarch64 at the moment.

Please run cargo clean to make sure everything is in a fresh state before compiling.

Haskell part: input-output-hk/testgen-hs#3

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michalrus

Hey, I started reviewing, but then noticed that it's a draft! Left a few comments either way :)

michalrus · 2025-09-16T10:21:19Z

nix/internal/unix.nix

    in
      (import inputs.flake-compat {
        src =
+          if targetSystem != "aarch64-darwin" && targetSystem != "aarch64-linux"


This looks like a merge/rebase artifact – wrong conflict resolution? The line is repeated.

Fixed in 418afac

michalrus · 2025-09-16T10:22:20Z

nix/internal/unix.nix

+              cp -r ${unpatched} $out
+              chmod -R +w $out
+              cd $out
+              patch -p1 -i ${./testgen-hs--enable-aarch64-linux.diff}


Wait, but we already have aarch64-linux on main. Something is off here, another conflict?

Fixed in 418afac

src/api/utils/txs/evaluate/model.rs

michalrus · 2025-09-16T10:25:16Z

crates/testgen/src/testgen.rs

-    sender: mpsc::Sender<FDRequest>,
-    current_child_pid: Arc<AtomicU32>,
+pub struct Testgen {
+    pub sender: mpsc::Sender<TestgenRequest>,


Why do these internal fields need to be public for everyone?

Resolved in a53a53c

michalrus · 2025-09-16T10:26:21Z

crates/testgen/src/testgen.rs

    }

-    /// This function is called at startup, so that we make sure that the worker is reasonable.
-    pub async fn startup_sanity_test(&self) -> Result<(), String> {


But isn’t this useful? Just in case that someone plugs another binary into the libexec directory.

This uses error serialization/deserialization. I can expect every binary integration to have a startup_sanity_test implementation of their own.
For evaluation, it's already handled via the init functionilty.

…ra tx-gen features)

…uation tests

ginnun marked this pull request as draft September 12, 2025 10:03

michalrus reviewed Sep 16, 2025

View reviewed changes

michalrus mentioned this pull request Sep 16, 2025

Implement tx submit evaluation via pallas & haskell #322

Closed

ginnun force-pushed the feat/tx-evaluation-rebased branch 3 times, most recently from c702f03 to a53a53c Compare September 22, 2025 12:06

ginnun changed the title ~~Feat/tx evaluation rebased~~ Tx evaluation Sep 23, 2025

ginnun force-pushed the feat/tx-evaluation-rebased branch from 7fb0adf to 52f662b Compare October 7, 2025 11:04

ginnun and others added 21 commits October 10, 2025 14:31

Implement tx submit evaluation via pallas

6f0316d

Ignare dead code warnings in the test code

2c748f2

Update pallas and resolve breaking changes

cf09eac

chore: add missing compile-time dependencies

df3c94c

chore: relax cargo-deny

dee8578

chore: fix the OCI (Docker) build

90215a1

feat: Create compile config 'evaluate'

1df1508

fix: aarch64-linux compilation of Pallas’ phase2

3b5a3dd

fix: a silly redirection bug

ebe64ca

fix: devshell on aarch64-linux

1ffd2ac

fix: don’t use musl on aarch64-linux – back to GNU

f4fed63

fix: drop -fexternal-interpreter for plutus-core

d87869d

chore: update nixpkgs for the new Rust and Clippy

e4c1b6a

chore: apply Clippy’s corrections

3e40245

chore: use the native aarch64-linux build of testgen-hs (with ext…

e54ae08

…ra tx-gen features)

feat: connect testgen-hs new Tx'Conway generator to the Rust eval…

7773ce6

…uation tests

fix: compilation warnings about unused variables

161464f

fix: make the failures prettier, and _not_ panics

0e32c19

feat: Native Rust evaluate, Haskell evaluate and tests

20fee4b

Remove unused dependencies

a5fddb3

Remove build config evaluate

c2acc53

ginnun added 13 commits October 10, 2025 14:33

Fix rebase artifacts -1-

097e168

Make sender not public

22e2c25

Initial support for v6 and formatting

f255e18

Implemented tx evalution for v6

83175aa

Better handling and errors for version 5 & 6

5b226d9

Add more tests to root evaluate

baf55d5

Disable a test for tx evaluate

26878b2

Better handling and errors for version 5 & 6 -2-

ab214b7

Introduced error wrapping for versions

bab8b36

Fix failing test

7d13307

Add native evaluator support back -1-

6a4c212

Add native evaluator support and configuration

10c5e61

Add tx_evaluator documentation

e67b1a9

ginnun force-pushed the feat/tx-evaluation-rebased branch from 3bcc5c5 to e67b1a9 Compare October 10, 2025 11:35

ginnun added 2 commits October 13, 2025 12:03

Add evaluator as a overridable query param

d9d014d

Improve evaluations with correct SlotConfig

b0ba559

michalrus linked an issue Nov 17, 2025 that may be closed by this pull request

Add POST /utils/txs/evaluate – how many execution units for a transaction #306

Open

Implement ogmious errors

102ee66

ginnun marked this pull request as ready for review December 15, 2025 10:02

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