Function with_tenant_key

nodedb/src/engine/sparse/btree.rs:30–42

Build a tenant-scoped composite key `"{tenant}:{a}:{b}"` using thread-local buffer.

(tenant_id: u64, a: &str, b: &str, f: impl FnOnce(&str) -> R)

/// Build a tenant-scoped composite key `"{tenant}:{a}:{b}"` using thread-local buffer.
fn with_tenant_key<R>(tenant_id: u64, a: &str, b: &str, f: impl FnOnce(&str) -> R) -> R {
    KEY_BUF.with(|buf| {
        let mut buf = buf.borrow_mut();
        buf.clear();
        use std::fmt::Write;
        let _ = write!(buf, "{tenant_id}");
        buf.push(':');
        buf.push_str(a);
        buf.push(':');
        buf.push_str(b);
        f(&buf)
    })
}

/// Build a tenant-scoped index key `"{tenant}:{a}:{b}:{c}:{d}"`.
pub(super) fn with_tenant_key4<R>(