fix(core): change allowed_random_relayers to opt-in model

Author: shiyasmohd

crates/core/src/app_state.rs

@@ -49,8 +49,8 @@ impl RelayersAllowedForRandom {
             // If the list is empty, it means all relayers are allowed (equivalent to "*")
             allowed_relayers.is_empty() || allowed_relayers.contains(relayer)
         } else {
-            // If no configuration exists for this chain, all relayers are allowed by default
-            true
+            // If no configuration exists for this chain, the feature is disabled
+            false
         }
     }
 }

crates/core/src/transaction/api/send_random_transaction.rs

@@ -31,7 +31,9 @@ pub async fn send_transaction_random(
 
 /// Selects a random available relayer for the specified chain.
 ///
-/// Filters out paused and internal-only relayers before making the selection.
+/// Filters out paused, internal-only, and relayers only allowed for random selection.
+/// Note: The random relayer feature must be explicitly enabled via `allowed_random_relayers`
+/// config for the network, otherwise all relayers will be filtered out.
 async fn select_random_relayer(
     state: &Arc<AppState>,
     chain_id: &ChainId,

documentation/rrelayer/docs/pages/config/networks/config.mdx

@@ -182,12 +182,13 @@ the documentation in the signer provider pages:
 ### allowed_random_relayers - optional
 
 Controls which relayers are eligible for selection when using the random relayer endpoint.
-If not specified, all available relayers can be selected (equivalent to `"*"`).
+**If not specified, the random relayer feature is disabled for this network.**
 
 **Options:**
-- `"*"` - Allow all relayers (default behavior)
+- `"*"` - Allow all relayers for random selection
 - Single address - Only allow one specific relayer for random selection
 - Array of addresses - Allow only the specified relayers for random selection
+- Not specified - Random relayer feature disabled
 
 ```yaml [rrelayer.yaml]
 name: first-rrelayer
@@ -210,14 +211,14 @@ networks: // [!code focus]
 
 **Examples:**
 
-Allow all relayers (default):
+Enable for all relayers:
 ```yaml
 allowed_random_relayers: "*"
 ```
 
 Allow only specific relayers:
 ```yaml
-allowed_random_relayers: 
+allowed_random_relayers:
   - "0x742f0677b50b0F1C2151865Dcb98BF32FeaF65c9"
   - "0x8ba1f109551bD432803012645Hac136c6d3A60E7"
 ```

documentation/rrelayer/docs/pages/integration/sdk/transactions/node.mdx

@@ -256,7 +256,7 @@ const txRequest: TransactionToSend = {
 };
 
 // Send to a random relayer on the specified chain
-let response = await client.network.sendTransactionRandom(chainId, txRequest);
+let response = await client.network.sendRandom(chainId, txRequest);
 
 // returns a TransactionReceipt - import { TransactionReceipt } from 'rrelayer';
 let relayTransactionResult = await client.transaction.waitForTransactionReceiptById(