feat: add deep health check (#3210)

Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>

crates/storage_impl/src/errors.rs

@@ -376,3 +376,53 @@ pub enum ConnectorError {
     #[error("Missing 3DS redirection payload: {field_name}")]
     MissingConnectorRedirectionPayload { field_name: &'static str },
 }
+
+#[derive(Debug, thiserror::Error)]
+pub enum HealthCheckDBError {
+    #[error("Error while connecting to database")]
+    DBError,
+    #[error("Error while writing to database")]
+    DBWriteError,
+    #[error("Error while reading element in the database")]
+    DBReadError,
+    #[error("Error while deleting element in the database")]
+    DBDeleteError,
+    #[error("Unpredictable error occurred")]
+    UnknownError,
+    #[error("Error in database transaction")]
+    TransactionError,
+}
+
+impl From<diesel::result::Error> for HealthCheckDBError {
+    fn from(error: diesel::result::Error) -> Self {
+        match error {
+            diesel::result::Error::DatabaseError(_, _) => Self::DBError,
+
+            diesel::result::Error::RollbackErrorOnCommit { .. }
+            | diesel::result::Error::RollbackTransaction
+            | diesel::result::Error::AlreadyInTransaction
+            | diesel::result::Error::NotInTransaction
+            | diesel::result::Error::BrokenTransactionManager => Self::TransactionError,
+
+            _ => Self::UnknownError,
+        }
+    }
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum HealthCheckRedisError {
+    #[error("Failed to establish Redis connection")]
+    RedisConnectionError,
+    #[error("Failed to set key value in Redis")]
+    SetFailed,
+    #[error("Failed to get key value in Redis")]
+    GetFailed,
+    #[error("Failed to delete key value in Redis")]
+    DeleteFailed,
+}
+
+#[derive(Debug, Clone, thiserror::Error)]
+pub enum HealthCheckLockerError {
+    #[error("Failed to establish Locker connection")]
+    FailedToCallLocker,
+}