rust部分推进：进程间通信（Windows平台命名管线）、内存页表、B+树、WAL恢复系统、动态配置

chusql-storage/src/protocol.rs

@@ -0,0 +1,53 @@
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+
+// 协议定义：Haskell ↔ Rust 之间那条"行分隔 JSON"消息的类型（请求 / 响应）。
+
+/// 一行：列名到 JSON 值的映射。
+pub type Row = HashMap<String, serde_json::Value>;
+
+/// 列类型；跟 Haskell 侧 TInt / TStr / TBool 对应。
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(rename_all = "lowercase")]
+pub enum ColumnType {
+    Int,
+    Str,
+    Bool,
+}
+
+/// 一列的 schema。
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+pub struct SchemaColumn {
+    pub name: String,
+    pub ty: ColumnType,
+}
+
+/// 请求；method 字段做 tag。
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(tag = "method", rename_all = "snake_case")]
+pub enum Request {
+    Ping,
+    Scan { table: String },
+    Insert {
+        table: String,
+        row: Row,
+        #[serde(default)]
+        key: Option<i64>,
+    },
+    LookupByIndex { table: String, key: i64 },
+    ReplaceAll { table: String, rows: Vec<Row> },
+    ListTables,
+    DescribeTable { table: String },
+}
+
+/// 响应；status 字段做 tag。
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(tag = "status", rename_all = "lowercase")]
+pub enum Response {
+    Pong,
+    Rows { rows: Vec<Row> },
+    Tables { tables: Vec<String> },
+    Schema { columns: Vec<SchemaColumn> },
+    Ok,
+    Error { message: String },
+}