Add defaul value when file dont exist

Author: Mechanix97

aggregation_mode/src/backend/config.rs

@@ -33,11 +33,18 @@ impl Config {
     }
 
     pub fn get_last_processed_block(&self) -> Result<u64, Box<dyn std::error::Error>> {
-        let mut file = File::open(&self.last_processed_block_filepath)?;
-        let mut contents = String::new();
-        file.read_to_string(&mut contents)?;
-        let lpb: LastProcessedBlock = serde_json::from_str(&contents)?;
-        Ok(lpb.last_processed_block)
+        match File::open(&self.last_processed_block_filepath) {
+            Err(_) =>{
+                // if file doesn't exist, default 0
+                Ok(0)
+            }
+            Ok(mut file) => {
+                let mut contents = String::new();
+                file.read_to_string(&mut contents)?;
+                let lpb: LastProcessedBlock = serde_json::from_str(&contents)?;
+                Ok(lpb.last_processed_block)
+            }
+        } 
     }
 
     pub fn update_last_processed_block(
@@ -51,6 +58,7 @@ impl Config {
         let mut file = OpenOptions::new()
             .write(true)
             .truncate(true)
+            .create(true)
             .open(&self.last_processed_block_filepath)?;
 
         let content = serde_json::to_string(&last_processed_block_struct)?;

config-files/config-proof-aggregator-mock.yaml

@@ -3,7 +3,7 @@ eth_ws_url: ws://localhost:8545
 max_proofs_in_queue: 1000
 proof_aggregation_service_address: 0xB0D4afd8879eD9F52b28595d31B441D079B2Ca07
 aligned_service_manager_address: 0x851356ae760d987E095750cCeb3bC6014560891C
-last_processed_block_filepath: config-files/proof-aggregator.last_processed_block.json
+last_processed_block_filepath: config-files/proof-aggregator2.last_processed_block.json
 ecdsa:
   private_key_store_path: config-files/anvil.proof-aggregator.ecdsa.key.json
   private_key_store_password: ''

config-files/proof-aggregator.last_processed_block.json

@@ -1 +1 @@
-{"last_processed_block":1305}
+{"last_processed_block":1346}