Align prover_type changes with PR #6157 to avoid merge conflicts: use todo!()

for ZisK and OpenVM backends (no ProverType variant exists for them yet) and
call self.backend.prover_type() directly instead of storing it as a field.

Author: avilagaston9

crates/l2/prover/src/backend/openvm.rs

@@ -65,7 +65,7 @@ impl ProverBackend for OpenVmBackend {
     type SerializedInput = StdIn;
 
     fn prover_type(&self) -> ProverType {
-        ProverType::Exec
+        todo!("No ProverType variant exists for OpenVM yet")
     }
 
     fn serialize_input(&self, input: &ProgramInput) -> Result<Self::SerializedInput, BackendError> {

crates/l2/prover/src/backend/zisk.rs

@@ -114,7 +114,7 @@ impl ProverBackend for ZiskBackend {
     type SerializedInput = ();
 
     fn prover_type(&self) -> ProverType {
-        ProverType::Exec
+        todo!("No ProverType variant exists for ZisK yet")
     }
 
     fn serialize_input(&self, input: &ProgramInput) -> Result<Self::SerializedInput, BackendError> {

crates/l2/prover/src/prover.rs

@@ -4,7 +4,7 @@ use crate::{
 };
 use ethrex_guest_program::input::ProgramInput;
 use ethrex_l2::sequencer::utils::get_git_commit_hash;
-use ethrex_l2_common::prover::{BatchProof, ProofData, ProofFormat, ProverType};
+use ethrex_l2_common::prover::{BatchProof, ProofData, ProofFormat};
 use std::time::Duration;
 use tokio::{
     io::{AsyncReadExt, AsyncWriteExt},
@@ -62,18 +62,15 @@ struct Prover<B: ProverBackend> {
     proof_coordinator_endpoints: Vec<Url>,
     proving_time_ms: u64,
     commit_hash: String,
-    prover_type: ProverType,
 }
 
 impl<B: ProverBackend> Prover<B> {
     pub fn new(backend: B, cfg: &ProverConfig) -> Self {
-        let prover_type = backend.prover_type();
         Self {
             backend,
             proof_coordinator_endpoints: cfg.proof_coordinators.clone(),
             proving_time_ms: cfg.proving_time_ms,
             commit_hash: get_git_commit_hash(),
-            prover_type,
         }
     }
 
@@ -121,7 +118,8 @@ impl<B: ProverBackend> Prover<B> {
 
     async fn request_new_input(&self, endpoint: &Url) -> Result<Option<ProverData>, String> {
         // Request the input with the correct batch_number
-        let request = ProofData::batch_request(self.commit_hash.clone(), self.prover_type);
+        let request =
+            ProofData::batch_request(self.commit_hash.clone(), self.backend.prover_type());
         let response = connect_to_prover_server_wr(endpoint, &request)
             .await
             .map_err(|e| format!("Failed to get Response: {e}"))?;