Feature/node 4963 lit node api

[GTC6244]

WHAT

A few changes to enable the SDK wrapper!

These changes aren't functional, and most simply involve moving models out of the lit-node project and into lit-node-core project, so that they are properly useable by external parties. This is the continuation of a process set up original by Mike when he started writing the rust SDK.

The net result is that we have a lot of namespace changes.

There are also a couple of extra helper functions in the SDK that get consumed by the wrapper project.

FROM COPILOT

• Move test helper modules (auth_sig, pkp, session_sigs, lit_actions) from lit-node tests into lit-node-testnet::common and update test imports accordingly.
• Move PayedEndpoint and SessionKeySignedMessageV2 to lit-node-core and update lit-node modules to import them from there.

[Copilot]

Pull request overview

This PR restructures several shared Lit Node types and test helpers to support an SDK wrapper, primarily by moving common test utilities into lit-node-testnet and relocating shared models into lit-node-core.

Changes:

• Move test helper modules (auth_sig, pkp, session_sigs, lit_actions) from lit-node tests into lit-node-testnet::common and update test imports accordingly.
• Move PayedEndpoint and SessionKeySignedMessageV2 to lit-node-core and update lit-node modules to import them from there.

Reviewed changes

Copilot reviewed 42 out of 43 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
rust/lit-node/lit-node/tests/integration/signing.rs	Update PKP helper imports to lit-node-testnet
rust/lit-node/lit-node/tests/integration/shadow.rs	Update auth/pkp helper imports to lit-node-testnet
rust/lit-node/lit-node/tests/integration/session_sigs.rs	Switch helpers to lit-node-testnet; add local init_test
rust/lit-node/lit-node/tests/integration/lit_actions.rs	Switch helper imports to lit-node-testnet
rust/lit-node/lit-node/tests/integration/epoch_change_long.rs	Change RNG usage to lit-node-testnet::rand::shared_rng()
rust/lit-node/lit-node/tests/integration/backup_datil_long.rs	Update auth/pkp helper imports to lit-node-testnet
rust/lit-node/lit-node/tests/common/web_user_tests.rs	Swap helper imports to lit-node-testnet::common
rust/lit-node/lit-node/tests/common/mod.rs	Remove exported helper modules moved to lit-node-testnet
rust/lit-node/lit-node/tests/common/ecdsa.rs	Switch PKP helper imports to lit-node-testnet
rust/lit-node/lit-node/tests/acceptance/payment.rs	Use lit_node_core::PayedEndpoint + lit_core::bytes_to_hex
rust/lit-node/lit-node/src/utils/web.rs	Import SessionKeySignedMessageV2 from lit-node-core
rust/lit-node/lit-node/src/tasks/payment.rs	Import PayedEndpoint from lit-node-core
rust/lit-node/lit-node/src/payment/selection.rs	Import PayedEndpoint + session key model from lit-node-core
rust/lit-node/lit-node/src/payment/payment_tracker.rs	Import PayedEndpoint from lit-node-core
rust/lit-node/lit-node/src/payment/payment_delegation.rs	Import PayedEndpoint + session key model from lit-node-core
rust/lit-node/lit-node/src/payment/mod.rs	Remove payed_endpoint module export (moved to core)
rust/lit-node/lit-node/src/models/mod.rs	Remove models::auth module export (moved to core)
rust/lit-node/lit-node/src/endpoints/web_client.rs	Import PayedEndpoint + session key model from lit-node-core
rust/lit-node/lit-node/src/endpoints/versions/v2.rs	Import PayedEndpoint from lit-node-core
rust/lit-node/lit-node/src/endpoints/pkp.rs	Import PayedEndpoint + session key model from lit-node-core
rust/lit-node/lit-node/src/config/chain.rs	Import PayedEndpoint from lit-node-core
rust/lit-node/lit-node/src/auth/session_sigs.rs	Import SessionKeySignedMessageV2 from lit-node-core (incl tests)
rust/lit-node/lit-node/src/auth/auth_material.rs	Update tests to import session key model from lit-node-core
rust/lit-node/lit-node/live_testnet_b.toml	Remove unused live testnet sample config
rust/lit-node/lit-node/Cargo.toml	Use workspace deps for siwe, siwe-recap, tracing
rust/lit-node/lit-node-testnet/src/validator.rs	Switch random selection to shared RNG helper
rust/lit-node/lit-node-testnet/src/testnet/datil/mod.rs	Avoid panic if cached node accounts file missing
rust/lit-node/lit-node-testnet/src/rand.rs	Add shared_rng() helper and rename thread RNG getter
rust/lit-node/lit-node-testnet/src/node_collection.rs	Make handshake_nodes public; change socket address formatting
rust/lit-node/lit-node-testnet/src/lib.rs	Export new common module
rust/lit-node/lit-node-testnet/src/end_user/pkp/mainnet.rs	Minor formatting-only change
rust/lit-node/lit-node-testnet/src/end_user/mod.rs	Add from_secret_key, PKP pubkey lookup, logging tweaks
rust/lit-node/lit-node-testnet/src/common/session_sigs.rs	Remove init_test; adjust imports
rust/lit-node/lit-node-testnet/src/common/pkp.rs	Fix imports; add tracing usage
rust/lit-node/lit-node-testnet/src/common/mod.rs	New shared test helper module root
rust/lit-node/lit-node-testnet/src/common/lit_actions.rs	Move lit-actions helpers into lit-node-testnet::common
rust/lit-node/lit-node-testnet/src/common/auth_sig.rs	Use lit_node_core models + lit_core encoding utils
rust/lit-node/lit-node-testnet/Cargo.toml	Add dependencies needed by new common helpers
rust/lit-node/lit-node-core/src/models/session_key.rs	Fix intra-crate import; remove debug logging
rust/lit-node/lit-node-core/src/models/payed_endpoint.rs	Simplify parse error type to core Error::Parse
rust/lit-node/lit-node-core/src/models.rs	Export payed_endpoint + session_key from core models
rust/lit-node/Cargo.toml	Add workspace member + workspace deps for siwe, tracing, etc.
rust/lit-node/Cargo.lock	Lockfile updates incl. new lit-node-simple-api package

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[Copilot]

shared_rng() returns Arc<Mutex<ThreadRng>>, but ThreadRng contains Rc<UnsafeCell<...>> and is not Send, so it cannot be put behind std::sync::Mutex (this should fail to compile). Also, shared_rng() creates a brand new Arc<Mutex<_>> on every call, so callers don't actually share the same RNG instance. Consider using a global OnceLock<Mutex<StdRng>> (or similar) for a truly shared RNG, or keep RNG thread-local and avoid wrapping it in Arc<Mutex<...>>.

Suggested change

	pub fn shared_rng() -> Arc<Mutex<ThreadRng>> {
	let shared_rng = Arc::new(Mutex::new(get_thread_rng()));
	shared_rng
	}
	pub fn shared_rng() -> ThreadRng {
	get_thread_rng()
	}

[GTC6244]

This is intentional to allow it to work inside a multi-threaded environment - the API server.

[Copilot]

NodeSet.socket_address is being constructed with a scheme prefix (e.g. http://1.2.3.4:7470). The Rust SDK request builder later formats URLs as {url_prefix}://{socket_address}/{api_path}, so including the scheme here will produce invalid URLs like http://http://.... Keep socket_address as host:port only and let UrlPrefix control the scheme.

[GTC6244]

I'm not sure that this is true - otherwise all the tests would fail 🤷

[Copilot]

from_secret_key uses LocalWallet::from_bytes(secret_key).unwrap(), which will panic on invalid input and makes the API harder to use safely (especially if this is intended for an SDK wrapper). Consider returning a Result<Self, _> (or anyhow::Result<Self>) and propagating the error instead of unwrapping.

[GTC6244]

TBD if we do this, or let it failed. Currently it's all test code, and it's wrapped inside a rocket server for external use. The endpoint will certainly panic, but that doesn't bring things down. ( Definitely not graceful, though ).