Create error.rs and Add Basic Errors

src/error.rs

@@ -0,0 +1,25 @@
+use reqwest::{ Error as ReqwestError, StatusCode };
+use serde_json::Error as SerdeError;
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum HeliusError {
+    #[error("Bad request to {path}: {text}")]
+    BadRequest { path: String, text: String },
+
+    #[error("Internal server error: {code} - {text}")]
+    InternalError { code: StatusCode, text: String},
+
+    #[error("Too many requests made to {path}")]
+    TooManyRequests { path: String },
+
+    #[error("Unauthorized access to {path}: {text}")]
+    Unauthorized { path: String, text: String },
+
+    #[error("Unknown error has occurred: HTTP {code} - {text}")]
+    Unknown { code: StatusCode, text: String },
+}
+
+
+// Handy type alias
+pub type Result<T> = std::result::Result<T, HeliusError>;