ref: Remove all unused errors (#163)

Author: LeoPatOZ

src/error.rs

@@ -10,26 +10,12 @@ use crate::robust_provider::Error as RobustProviderError;
 
 #[derive(Error, Debug, Clone)]
 pub enum ScannerError {
-    // #[error("WebSocket error: {0}")]
-    // WebSocketError(#[from] tokio_tungstenite::tungstenite::Error),
-    #[error("Serialization error: {0}")]
-    SerializationError(Arc<serde_json::Error>),
-
     #[error("RPC error: {0}")]
     RpcError(Arc<RpcError<TransportErrorKind>>),
 
-    #[error("Channel send error")]
-    ChannelError,
-
     #[error("Service is shutting down")]
     ServiceShutdown,
 
-    #[error("No subscriber set for streaming")]
-    NoSubscriber,
-
-    #[error("Historical sync failed: {0}")]
-    HistoricalSyncError(String),
-
     #[error("Block not found, Block Id: {0}")]
     BlockNotFound(BlockId),
 
@@ -50,12 +36,6 @@ impl From<RobustProviderError> for ScannerError {
     }
 }
 
-impl From<serde_json::Error> for ScannerError {
-    fn from(error: serde_json::Error) -> Self {
-        ScannerError::SerializationError(Arc::new(error))
-    }
-}
-
 impl From<RpcError<TransportErrorKind>> for ScannerError {
     fn from(error: RpcError<TransportErrorKind>) -> Self {
         ScannerError::RpcError(Arc::new(error))