006 connection active drop single

✓ Passing This code compiles and runs correctly.

Code

~import app/db
~import std/io

~app/db:open(connstr: "postgres://localhost/test")
| connected c |> app/db:tx.begin(conn: c)
    | tx t |> app/db:tx.exec(tx: t, sql: "INSERT INTO users VALUES (1)")
        | ok t2 |> app/db:tx.commit(tx: t2)
            | committed conn |> std/io:print.ln("committed")
| connection-failed |> _

input.kz

Actual

Executing: INSERT INTO users VALUES (1)
COMMIT
committed
Connection closed

Expected output

Executing: INSERT INTO users VALUES (1)
COMMIT
committed
Connection closed

Imported Files

// open/tx lifecycle API — ground truth for korulang.org phantom explorer

const std = @import("std");

const Connection = struct { handle: i32 };
const Transaction = struct { conn_handle: i32 };

~pub event open { connstr: []const u8 }
| connected *Connection<connected!>
| connection-failed

~proc open|zig {
    _ = connstr;
    const c = std.heap.page_allocator.create(Connection) catch unreachable;
    c.* = Connection{ .handle = 42 };
    return .{ .connected = c };
}

~pub event tx.begin { conn: *Connection<!connected|!active> }
| tx *Transaction<started!>

~proc tx.begin|zig {
    const t = std.heap.page_allocator.create(Transaction) catch unreachable;
    t.* = Transaction{ .conn_handle = conn.handle };
    return .{ .tx = t };
}

~pub event tx.exec { tx: *Transaction<!started|!active>, sql: []const u8 }
| ok *Transaction<active!>

~proc tx.exec|zig {
    std.debug.print("Executing: {s}\n", .{sql});
    return .{ .ok = tx };
}

~pub event tx.commit { tx: *Transaction<!active> }
| committed *Connection<active!>

~proc tx.commit|zig {
    std.debug.print("COMMIT\n", .{});
    const c = std.heap.page_allocator.create(Connection) catch unreachable;
    c.* = Connection{ .handle = tx.conn_handle };
    std.heap.page_allocator.destroy(tx);
    return .{ .committed = c };
}

~pub event tx.rollback { tx: *Transaction<!active> }
| rolled-back *Connection<active!>

~proc tx.rollback|zig {
    std.debug.print("ROLLBACK\n", .{});
    const c = std.heap.page_allocator.create(Connection) catch unreachable;
    c.* = Connection{ .handle = tx.conn_handle };
    std.heap.page_allocator.destroy(tx);
    return .{ .rolled_back = c };
}

~[!]pub event close { conn: *Connection<!active> }

~proc close|zig {
    std.debug.print("Connection closed\n", .{});
    std.heap.page_allocator.destroy(conn);
}

db.kz

Test Configuration

MUST_RUN

← 005 transaction active nonvoid only 001 struct basic →