libsql,namespaces: add client-side ATTACH support

Author: psarna

libsql-server/tests/namespaces/meta.rs

@@ -113,9 +113,8 @@ fn meta_store() {
             )?;
             let foo_conn = foo.connect()?;
 
-            foo_conn.execute("attach foo as foo", ()).await.unwrap();
             foo_conn
-                .execute("select * from foo.sqlite_master", ())
+                .execute_batch("attach foo as foo; select * from foo.sqlite_master")
                 .await
                 .unwrap();
         }

libsql/src/parser.rs

@@ -2,7 +2,7 @@
 
 use crate::{Error, Result};
 use fallible_iterator::FallibleIterator;
-use sqlite3_parser::ast::{Cmd, PragmaBody, QualifiedName, Stmt, TransactionType};
+use sqlite3_parser::ast::{Cmd, PragmaBody, QualifiedName, Stmt, TransactionType, Expr, Id};
 use sqlite3_parser::lexer::sql::{Parser, ParserError};
 
 /// A group of statements to be executed together.
@@ -30,6 +30,8 @@ pub enum StmtKind {
     Write,
     Savepoint,
     Release,
+    Attach,
+    Detach,
     Other,
 }
 
@@ -116,6 +118,12 @@ impl StmtKind {
                 savepoint_name: Some(_),
                 ..
             }) => Some(Self::Release),
+            Cmd::Stmt(Stmt::Attach {
+                expr: Expr::Id(Id(expr)),
+                db_name: Expr::Id(Id(name)),
+                ..
+            }) if expr == name => Some(Self::Attach),
+            Cmd::Stmt(Stmt::Detach(_)) => Some(Self::Detach),
             _ => None,
         }
     }

libsql/src/replication/connection.rs

@@ -66,7 +66,7 @@ impl State {
             (State::Txn, StmtKind::Release) => State::Txn,
             (_, StmtKind::Release) => State::Invalid,
 
-            (state, StmtKind::Other | StmtKind::Write | StmtKind::Read) => state,
+            (state, StmtKind::Other | StmtKind::Write | StmtKind::Read | StmtKind::Attach | StmtKind::Detach) => state,
             (State::Invalid, _) => State::Invalid,
 
             (State::Init, StmtKind::TxnBegin) => State::Txn,