feat(node-framework): Add Main Node Client layer (#2132)

Note: healthchecks for `Main Node` and `Eth` client layers will be added
in the next PR(there is a general principle of change.)

## Checklist

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- [ ] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [ ] Tests for the changes have been added / updated.
- [ ] Documentation comments have been added / updated.
- [ ] Code has been formatted via `zk fmt` and `zk lint`.
- [ ] Spellcheck has been run via `zk spellcheck`.

core/node/node_framework/src/implementations/layers/main_node_client.rs

@@ -0,0 +1,48 @@
+use std::num::NonZeroUsize;
+
+use anyhow::Context;
+use zksync_types::{url::SensitiveUrl, L2ChainId};
+use zksync_web3_decl::client::{Client, DynClient, L2};
+
+use crate::{
+    implementations::resources::main_node_client::MainNodeClientResource,
+    service::ServiceContext,
+    wiring_layer::{WiringError, WiringLayer},
+};
+
+#[derive(Debug)]
+pub struct MainNodeClientLayer {
+    url: SensitiveUrl,
+    rate_limit_rps: NonZeroUsize,
+    l2_chain_id: L2ChainId,
+}
+
+impl MainNodeClientLayer {
+    pub fn new(url: SensitiveUrl, rate_limit_rps: NonZeroUsize, l2_chain_id: L2ChainId) -> Self {
+        Self {
+            url,
+            rate_limit_rps,
+            l2_chain_id,
+        }
+    }
+}
+
+#[async_trait::async_trait]
+impl WiringLayer for MainNodeClientLayer {
+    fn layer_name(&self) -> &'static str {
+        "main_node_client_layer"
+    }
+
+    async fn wire(self: Box<Self>, mut context: ServiceContext<'_>) -> Result<(), WiringError> {
+        let main_node_client = Client::http(self.url)
+            .context("failed creating JSON-RPC client for main node")?
+            .for_network(self.l2_chain_id.into())
+            .with_allowed_requests_per_second(self.rate_limit_rps)
+            .build();
+
+        context.insert_resource(MainNodeClientResource(
+            Box::new(main_node_client) as Box<DynClient<L2>>
+        ))?;
+        Ok(())
+    }
+}

core/node/node_framework/src/implementations/layers/mod.rs

@@ -8,6 +8,7 @@ pub mod eth_watch;
 pub mod healtcheck_server;
 pub mod house_keeper;
 pub mod l1_gas;
+pub mod main_node_client;
 pub mod metadata_calculator;
 pub mod object_store;
 pub mod pk_signing_eth_client;