rust view panic can make reducer fail #3794
Description
it looks like that views can stop reducers from working if they error out.
#[table(name = test_table_datatypes, public)]
pub struct TestTableDatatypes {
#[primary_key]
#[auto_inc]
pub t_u64: u64,
#[index(btree)]
pub t_u32: u32,
// shortened for clarity
}
#[reducer]
pub fn clear_integration_tests(ctx: &ReducerContext){
for row in ctx.db.test_table_datatypes().iter(){
ctx.db.test_table_datatypes().delete(row);
}
}
#[view(name = test_first_type_row, public)]
pub fn view_test_first_type_row(ctx: &ViewContext) -> Vec<TestTableDatatypes>{
vec![ctx.db.test_table_datatypes().t_u32().filter(0..u32::MAX).next().unwrap()]
}i know i shouldn't use unwrap like that and have it as
#[view(name = test_first_type_row, public)]
pub fn view_test_first_type_row(ctx: &ViewContext) -> Vec<TestTableDatatypes>{
if let Some(row) = ctx.db.test_table_datatypes().t_u32().filter(0..u32::MAX).next(){
vec![row]
} else{
vec![]
}
}but i wanted to know what happens when views error.
log errror
2025-11-30T14:39:40.725175Z PANIC: test_first_type_row src\main_types\integration_tests.rs:159: called `Option::unwrap()` on a `None` value
in core::ops::function::Fn::call::hd2f658f7d0e1fd39
in std::panicking::rust_panic_with_hook::he3dc6abfb01fb415
in std::panicking::begin_panic_handler::{{closure}}::h8f2339f35afafb93
in std::sys::backtrace::__rust_end_short_backtrace::h4aa478b171e13037
in __rustc[de2ca18b4c54d5b8]::rust_begin_unwind
in core::panicking::panic_fmt::h808dbde205a89691
in core::panicking::panic::hd2efa669b7ab826e
in core::option::unwrap_failed::h314697a0a1a32358
in <Func as spacetimedb::rt::View<(),Elem>>::invoke::h9ee815c87d661ca5
in spacetimedb::rt::invoke_view::h8a69c95d34f7731a
in spacetime_module::main_types::integration_tests::view_test_first_type_row::invoke::h2271714ae5c944ad
in __call_view__
2025-11-30T14:39:45.698837Z PANIC: test_first_type_row src\main_types\integration_tests.rs:159: called `Option::unwrap()` on a `None` value
in core::ops::function::Fn::call::hd2f658f7d0e1fd39
in std::panicking::rust_panic_with_hook::he3dc6abfb01fb415
in std::panicking::begin_panic_handler::{{closure}}::h8f2339f35afafb93
in std::sys::backtrace::__rust_end_short_backtrace::h4aa478b171e13037
in __rustc[de2ca18b4c54d5b8]::rust_begin_unwind
in core::panicking::panic_fmt::h808dbde205a89691
in core::panicking::panic::hd2efa669b7ab826e
in core::option::unwrap_failed::h314697a0a1a32358
in <Func as spacetimedb::rt::View<(),Elem>>::invoke::h9ee815c87d661ca5
in spacetimedb::rt::invoke_view::h8a69c95d34f7731a
in spacetime_module::main_types::integration_tests::view_test_first_type_row::invoke::h2271714ae5c944ad
in __call_view__
server cmd error
←[2m2025-11-30T14:39:40.725436Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m27←[0m←[2m:←[0m view "test_first_type_row" runtime error: error while executing at wasm backtrace:
0: 0x31dbe - spacetime_module.wasm!__rustc[de2ca18b4c54d5b8]::__rust_abort
1: 0x2fc0a - spacetime_module.wasm!__rustc[de2ca18b4c54d5b8]::__rust_start_panic
2: 0x32a51 - spacetime_module.wasm!__rustc[de2ca18b4c54d5b8]::rust_panic
3: 0x32a41 - spacetime_module.wasm!std::panicking::rust_panic_with_hook::he3dc6abfb01fb415
4: 0x31f2c - spacetime_module.wasm!std::panicking::begin_panic_handler::{{closure}}::h8f2339f35afafb93
5: 0x31e66 - spacetime_module.wasm!std::sys::backtrace::__rust_end_short_backtrace::h4aa478b171e13037
6: 0x325dd - spacetime_module.wasm!__rustc[de2ca18b4c54d5b8]::rust_begin_unwind
7: 0x33734 - spacetime_module.wasm!core::panicking::panic_fmt::h808dbde205a89691
8: 0x336fd - spacetime_module.wasm!core::panicking::panic::hd2efa669b7ab826e
9: 0x34dab - spacetime_module.wasm!core::option::unwrap_failed::h314697a0a1a32358
10: 0x11602 - spacetime_module.wasm!<Func as spacetimedb::rt::View<(),Elem>>::invoke::h9ee815c87d661ca5
11: 0x10cd - spacetime_module.wasm!spacetimedb::rt::invoke_view::h8a69c95d34f7731a
12: 0x1261b - spacetime_module.wasm!spacetime_module::main_types::integration_tests::view_test_first_type_row::invoke::h2271714ae5c944ad
13: 0x26e6a - spacetime_module.wasm!__call_view__
←[2m2025-11-30T14:39:40.725803Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #14: __rustc[de2ca18b4c54d5b8]::__rust_abort
←[2m2025-11-30T14:39:40.728062Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #13: __rustc[de2ca18b4c54d5b8]::__rust_start_panic
←[2m2025-11-30T14:39:40.728487Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #12: __rustc[de2ca18b4c54d5b8]::rust_panic
←[2m2025-11-30T14:39:40.729174Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #11: std::panicking::rust_panic_with_hook::he3dc6abfb01fb415
←[2m2025-11-30T14:39:40.729513Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #10: std::panicking::begin_panic_handler::{{closure}}::h8f2339f35afafb93
←[2m2025-11-30T14:39:40.729855Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #9: std::sys::backtrace::__rust_end_short_backtrace::h4aa478b171e13037
←[2m2025-11-30T14:39:40.730069Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #8: __rustc[de2ca18b4c54d5b8]::rust_begin_unwind
←[2m2025-11-30T14:39:40.730287Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #7: core::panicking::panic_fmt::h808dbde205a89691
←[2m2025-11-30T14:39:40.730498Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #6: core::panicking::panic::hd2efa669b7ab826e
←[2m2025-11-30T14:39:40.730760Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #5: core::option::unwrap_failed::h314697a0a1a32358
←[2m2025-11-30T14:39:40.730983Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #4: <Func as spacetimedb::rt::View<(),Elem>>::invoke::h9ee815c87d661ca5
←[2m2025-11-30T14:39:40.731205Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #3: spacetimedb::rt::invoke_view::h8a69c95d34f7731a
←[2m2025-11-30T14:39:40.731417Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #2: spacetime_module::main_types::integration_tests::view_test_first_type_row::invoke::h2271714ae5c944ad
←[2m2025-11-30T14:39:40.731630Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #1: __call_view__
←[2m2025-11-30T14:39:45.698947Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m27←[0m←[2m:←[0m view "test_first_type_row" runtime error: error while executing at wasm backtrace:
0: 0x31dbe - spacetime_module.wasm!__rustc[de2ca18b4c54d5b8]::__rust_abort
1: 0x2fc0a - spacetime_module.wasm!__rustc[de2ca18b4c54d5b8]::__rust_start_panic
2: 0x32a51 - spacetime_module.wasm!__rustc[de2ca18b4c54d5b8]::rust_panic
3: 0x32a41 - spacetime_module.wasm!std::panicking::rust_panic_with_hook::he3dc6abfb01fb415
4: 0x31f2c - spacetime_module.wasm!std::panicking::begin_panic_handler::{{closure}}::h8f2339f35afafb93
5: 0x31e66 - spacetime_module.wasm!std::sys::backtrace::__rust_end_short_backtrace::h4aa478b171e13037
6: 0x325dd - spacetime_module.wasm!__rustc[de2ca18b4c54d5b8]::rust_begin_unwind
7: 0x33734 - spacetime_module.wasm!core::panicking::panic_fmt::h808dbde205a89691
8: 0x336fd - spacetime_module.wasm!core::panicking::panic::hd2efa669b7ab826e
9: 0x34dab - spacetime_module.wasm!core::option::unwrap_failed::h314697a0a1a32358
10: 0x11602 - spacetime_module.wasm!<Func as spacetimedb::rt::View<(),Elem>>::invoke::h9ee815c87d661ca5
11: 0x10cd - spacetime_module.wasm!spacetimedb::rt::invoke_view::h8a69c95d34f7731a
12: 0x1261b - spacetime_module.wasm!spacetime_module::main_types::integration_tests::view_test_first_type_row::invoke::h2271714ae5c944ad
13: 0x26e6a - spacetime_module.wasm!__call_view__
←[2m2025-11-30T14:39:45.699340Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #14: __rustc[de2ca18b4c54d5b8]::__rust_abort
←[2m2025-11-30T14:39:45.701429Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #13: __rustc[de2ca18b4c54d5b8]::__rust_start_panic
←[2m2025-11-30T14:39:45.701772Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #12: __rustc[de2ca18b4c54d5b8]::rust_panic
←[2m2025-11-30T14:39:45.702097Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #11: std::panicking::rust_panic_with_hook::he3dc6abfb01fb415
←[2m2025-11-30T14:39:45.702389Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #10: std::panicking::begin_panic_handler::{{closure}}::h8f2339f35afafb93
←[2m2025-11-30T14:39:45.702657Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #9: std::sys::backtrace::__rust_end_short_backtrace::h4aa478b171e13037
←[2m2025-11-30T14:39:45.702911Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #8: __rustc[de2ca18b4c54d5b8]::rust_begin_unwind
←[2m2025-11-30T14:39:45.703142Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #7: core::panicking::panic_fmt::h808dbde205a89691
←[2m2025-11-30T14:39:45.703409Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #6: core::panicking::panic::hd2efa669b7ab826e
←[2m2025-11-30T14:39:45.703646Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #5: core::option::unwrap_failed::h314697a0a1a32358
←[2m2025-11-30T14:39:45.703693Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #4: <Func as spacetimedb::rt::View<(),Elem>>::invoke::h9ee815c87d661ca5
←[2m2025-11-30T14:39:45.703947Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #3: spacetimedb::rt::invoke_view::h8a69c95d34f7731a
←[2m2025-11-30T14:39:45.704180Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #2: spacetime_module::main_types::integration_tests::view_test_first_type_row::invoke::h2271714ae5c944ad
←[2m2025-11-30T14:39:45.704418Z←[0m ←[32m INFO←[0m ←[2mcrates\core\src\host\wasmtime\wasmtime_module.rs←[0m←[2m:←[0m←[2m31←[0m←[2m:←[0m Frame #1: __call_view__