大改，整理项目结构，完成rust ffi调用，写好tcp接口

chusql-core/storage/tests/wal_test.rs

@@ -0,0 +1,101 @@
+use chusql_core_storage::protocol::Row;
+use chusql_core_storage::wal::{Wal, WalOp};
+use serde_json::json;
+
+// WAL 测试：追加、读取、清空、截断尾巴。
+
+
+/// 用键值对构造一行
+fn row(pairs: &[(&str, serde_json::Value)]) -> Row {
+    let mut m = Row::new();
+    for (k, v) in pairs {
+        m.insert((*k).to_string(), v.clone());
+    }
+    m
+}
+
+/// 三种操作写完都能原样读回
+#[test]
+fn append_and_read_round_trips() {
+    let dir = tempfile::tempdir().unwrap();
+    let wal = Wal::new(dir.path().join("wal.log"));
+
+    let ops = [
+        WalOp::Insert {
+            table: "users".into(),
+            row: row(&[("id", json!(1)), ("name", json!("Alice"))]),
+        },
+        WalOp::ReplaceAll {
+            table: "users".into(),
+            rows: vec![
+                row(&[("id", json!(1)), ("name", json!("Alice"))]),
+                row(&[("id", json!(2)), ("name", json!("Bob"))]),
+            ],
+        },
+        WalOp::DropColumn {
+            table: "users".into(),
+            column: "age".into(),
+            rows: vec![
+                row(&[("id", json!(1)), ("name", json!("Alice"))]),
+                row(&[("id", json!(2)), ("name", json!("Bob"))]),
+            ],
+        },
+    ];
+    for op in ops {
+        wal.clear().unwrap();
+        wal.append(&op).unwrap();
+        assert_eq!(wal.read().unwrap().unwrap(), op);
+    }
+}
+
+/// 文件不存在或为空都返回 None
+#[test]
+fn read_without_content_returns_none() {
+    let dir = tempfile::tempdir().unwrap();
+    let missing = Wal::new(dir.path().join("missing.log"));
+    assert!(missing.read().unwrap().is_none());
+
+    let path = dir.path().join("wal.log");
+    std::fs::write(&path, b"").unwrap();
+    let empty = Wal::new(&path);
+    assert!(empty.read().unwrap().is_none());
+}
+
+/// 清空后读不到
+#[test]
+fn clear_truncates() {
+    let dir = tempfile::tempdir().unwrap();
+    let path = dir.path().join("wal.log");
+    let wal = Wal::new(&path);
+
+    wal.append(&WalOp::Insert {
+        table: "t".into(),
+        row: row(&[("id", json!(1))]),
+    })
+    .unwrap();
+    assert!(wal.read().unwrap().is_some());
+
+    wal.clear().unwrap();
+    assert!(wal.read().unwrap().is_none());
+    assert_eq!(std::fs::metadata(&path).unwrap().len(), 0);
+}
+
+/// 尾巴截断被忽略
+#[test]
+fn truncated_tail_is_ignored() {
+    let dir = tempfile::tempdir().unwrap();
+    let path = dir.path().join("wal.log");
+    let wal = Wal::new(&path);
+
+    wal.append(&WalOp::Insert {
+        table: "users".into(),
+        row: row(&[("id", json!(1)), ("name", json!("Alice"))]),
+    })
+    .unwrap();
+
+    let full = std::fs::read(&path).unwrap();
+    std::fs::write(&path, &full[..full.len() - 5]).unwrap();
+
+    assert!(wal.read().unwrap().is_none());
+}
+