aquatic_ws_protocol: refactor, moving code into submodules

aquatic_ws_protocol/src/response/error.rs

@@ -0,0 +1,24 @@
+use std::borrow::Cow;
+
+use serde::{Deserialize, Serialize};
+
+use crate::common::*;
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum ErrorResponseAction {
+    Announce,
+    Scrape,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct ErrorResponse {
+    #[serde(rename = "failure reason")]
+    pub failure_reason: Cow<'static, str>,
+    /// Action of original request
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub action: Option<ErrorResponseAction>,
+    // Should not be renamed
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub info_hash: Option<InfoHash>,
+}