Panic error when reloading a dynamic path related to reactive_graph dependency

[CrawKatt]

hi, I've been trying to make a Web Dashboard for my Discord Bot, so I need to get data from the Discord API for some signals. But for some reason when reloading my path localhost:3000/dashboard/<guild_id> it returns a panic.

Panic Backtrace

    Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.38s
       Cargo finished cargo build --package=tailwind_actix --lib --target-dir=/home/crawkatt/RustroverProjects/tailwind_actix/target/front --target=wasm32-unknown-unknown --no-default-features --features=hydrate
       Front compiling WASM
    Tailwind finished tailwindcss --input style/tailwind.css --config tailwind.config.js --output /home/crawkatt/RustroverProjects/tailwind_actix/target/tmp/tailwind.css
   Compiling tailwind_actix v0.1.0 (/home/crawkatt/RustroverProjects/tailwind_actix)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.50s
       Cargo finished cargo build --package=tailwind_actix --bin=tailwind_actix --no-default-features --features=ssr
      Notify watching paths style/tailwind.css, src, public, tailwind.config.js
     Serving at http://127.0.0.1:3000
thread 'actix-rt|system:0|arbiter:0' panicked at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/reactive_graph-0.1.0/src/owner/arena.rs:57:25:
at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/reactive_graph-0.1.0/src/owner/arena.rs:60:29, the `sandboxed-arenas` feature is active, but no Arena is active
stack backtrace:
   0: rust_begin_unwind
             at /rustc/18b1161ec9eeab8927f91405bca0ddf59a4a26c9/library/std/src/panicking.rs:665:5
   1: core::panicking::panic_fmt
             at /rustc/18b1161ec9eeab8927f91405bca0ddf59a4a26c9/library/core/src/panicking.rs:74:14
   2: reactive_graph::owner::arena::Arena::with::{{closure}}::{{closure}}
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/reactive_graph-0.1.0/src/owner/arena.rs:57:25
   3: core::option::Option<T>::unwrap_or_else
             at /home/crawkatt/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/option.rs:1014:21
   4: reactive_graph::owner::arena::Arena::with::{{closure}}
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/reactive_graph-0.1.0/src/owner/arena.rs:53:22
   5: std::thread::local::LocalKey<core::cell::RefCell<T>>::with_borrow::{{closure}}
             at /home/crawkatt/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:471:26
   6: std::thread::local::LocalKey<T>::try_with
             at /home/crawkatt/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:283:12
   7: std::thread::local::LocalKey<T>::with
             at /home/crawkatt/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:260:9
   8: std::thread::local::LocalKey<core::cell::RefCell<T>>::with_borrow
             at /home/crawkatt/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:471:14
   9: reactive_graph::owner::arena::Arena::with
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/reactive_graph-0.1.0/src/owner/arena.rs:52:13
  10: <reactive_graph::owner::storage::SyncStorage as reactive_graph::owner::storage::Storage<T>>::try_with
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/reactive_graph-0.1.0/src/owner/storage.rs:75:9
  11: reactive_graph::owner::arena_item::ArenaItem<T,S>::try_with_value
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/reactive_graph-0.1.0/src/owner/arena_item.rs:105:9
  12: <reactive_graph::signal::write::WriteSignal<T,S> as reactive_graph::traits::Write>::try_write
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/reactive_graph-0.1.0/src/signal/write.rs:137:21
  13: <T as reactive_graph::traits::Update>::try_maybe_update
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/reactive_graph-0.1.0/src/traits.rs:507:24
  14: reactive_graph::traits::Update::try_update
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/reactive_graph-0.1.0/src/traits.rs:484:9
  15: <T as reactive_graph::traits::Set>::set
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/reactive_graph-0.1.0/src/traits.rs:540:9
  16: tailwind_actix::frontend::pages::server_settings::fetch_and_set_data::{{closure}}
             at ./src/frontend/pages/server_settings.rs:165:5
  17: tailwind_actix::frontend::pages::server_settings::__ServerSettings::{{closure}}
             at ./src/frontend/pages/server_settings.rs:37:82
  18: <core::pin::Pin<P> as core::future::future::Future>::poll
             at /home/crawkatt/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/future/future.rs:123:9
  19: tokio::runtime::task::core::Core<T,S>::poll::{{closure}}
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/task/core.rs:331:17
  20: tokio::loom::std::unsafe_cell::UnsafeCell<T>::with_mut
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/loom/std/unsafe_cell.rs:16:9
  21: tokio::runtime::task::core::Core<T,S>::poll
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/task/core.rs:320:13
  22: tokio::runtime::task::harness::poll_future::{{closure}}
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/task/harness.rs:499:19
  23: <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /home/crawkatt/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:272:9
  24: std::panicking::try::do_call
             at /home/crawkatt/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:557:40
  25: __rust_try
  26: std::panicking::try
             at /home/crawkatt/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:520:19
  27: std::panic::catch_unwind
             at /home/crawkatt/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:358:14
  28: tokio::runtime::task::harness::poll_future
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/task/harness.rs:487:18
  29: tokio::runtime::task::harness::Harness<T,S>::poll_inner
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/task/harness.rs:209:27
  30: tokio::runtime::task::harness::Harness<T,S>::poll
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/task/harness.rs:154:15
  31: tokio::runtime::task::raw::poll
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/task/raw.rs:271:5
  32: tokio::runtime::task::raw::RawTask::poll
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/task/raw.rs:201:18
  33: tokio::runtime::task::LocalNotified<S>::run
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/task/mod.rs:435:9
  34: tokio::task::local::LocalSet::tick::{{closure}}
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/task/local.rs:739:63
  35: tokio::runtime::coop::with_budget
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/coop.rs:107:5
  36: tokio::runtime::coop::budget
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/coop.rs:73:5
  37: tokio::task::local::LocalSet::tick
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/task/local.rs:739:31
  38: <tokio::task::local::RunUntil<T> as core::future::future::Future>::poll::{{closure}}
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/task/local.rs:1045:16
  39: tokio::task::local::LocalSet::with::{{closure}}
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/task/local.rs:793:13
  40: std::thread::local::LocalKey<T>::try_with
             at /home/crawkatt/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:283:12
  41: std::thread::local::LocalKey<T>::with
             at /home/crawkatt/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:260:9
  42: tokio::task::local::LocalSet::with
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/task/local.rs:791:9
  43: <tokio::task::local::RunUntil<T> as core::future::future::Future>::poll
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/task/local.rs:1031:9
  44: tokio::task::local::LocalSet::run_until::{{closure}}
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/task/local.rs:689:19
  45: <core::pin::Pin<P> as core::future::future::Future>::poll
             at /home/crawkatt/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/future/future.rs:123:9
  46: tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}::{{closure}}::{{closure}}
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/scheduler/current_thread/mod.rs:729:57
  47: tokio::runtime::coop::with_budget
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/coop.rs:107:5
  48: tokio::runtime::coop::budget
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/coop.rs:73:5
  49: tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}::{{closure}}
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/scheduler/current_thread/mod.rs:729:25
  50: tokio::runtime::scheduler::current_thread::Context::enter
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/scheduler/current_thread/mod.rs:428:19
  51: tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/scheduler/current_thread/mod.rs:728:36
  52: tokio::runtime::scheduler::current_thread::CoreGuard::enter::{{closure}}
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/scheduler/current_thread/mod.rs:807:68
  53: tokio::runtime::context::scoped::Scoped<T>::set
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/context/scoped.rs:40:9
  54: tokio::runtime::context::set_scheduler::{{closure}}
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/context.rs:180:26
  55: std::thread::local::LocalKey<T>::try_with
             at /home/crawkatt/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:283:12
  56: std::thread::local::LocalKey<T>::with
             at /home/crawkatt/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:260:9
  57: tokio::runtime::context::set_scheduler
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/context.rs:180:9
  58: tokio::runtime::scheduler::current_thread::CoreGuard::enter
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/scheduler/current_thread/mod.rs:807:27
  59: tokio::runtime::scheduler::current_thread::CoreGuard::block_on
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/scheduler/current_thread/mod.rs:716:19
  60: tokio::runtime::scheduler::current_thread::CurrentThread::block_on::{{closure}}
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/scheduler/current_thread/mod.rs:196:28
  61: tokio::runtime::context::runtime::enter_runtime
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/context/runtime.rs:65:16
  62: tokio::runtime::scheduler::current_thread::CurrentThread::block_on
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/scheduler/current_thread/mod.rs:184:9
  63: tokio::runtime::runtime::Runtime::block_on_inner
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/runtime.rs:368:47
  64: tokio::runtime::runtime::Runtime::block_on
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/runtime/runtime.rs:342:13
  65: tokio::task::local::LocalSet::block_on
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/task/local.rs:646:9
  66: actix_rt::runtime::Runtime::block_on
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/actix-rt-2.10.0/src/runtime.rs:138:9
  67: actix_rt::arbiter::Arbiter::with_tokio_rt::{{closure}}
             at /home/crawkatt/.cargo/registry/src/index.crates.io-6f17d22bba15001f/actix-rt-2.10.0/src/arbiter.rs:143:21
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

apparently the problem is in set_roles.set() and set_channels.set() since when commenting those lines the panic no longer occurs but I do not have how to assign the values I need.

My Component

use crate::frontend::components::header::Header;
use crate::frontend::components::role_dropdown::RoleDropdown;
use crate::frontend::components::sidebar::Sidebar;
use crate::frontend::components::channel_dropdown::ChannelDropdown;
use crate::models::guild::{DiscordChannel, DiscordRole};

use std::fmt::Debug;
use leptos::logging::log;
use leptos::prelude::*;
use leptos::task::spawn_local;
use leptos_router::hooks::use_params;
use leptos_router::params::Params;
use reqwest::Client;
use serde::de::DeserializeOwned;
use crate::frontend::components::text_card::TextCard;

#[derive(Params, PartialEq)]
struct DashboardParams {
    guild_id: Option<String>
}

#[component]
pub fn ServerSettings() -> impl IntoView {
    let active_dropdown = RwSignal::new(None);
    let params = use_params::<DashboardParams>();
    let guild_id = params
        .read()
        .as_ref()
        .ok()
        .and_then(|params| params.guild_id.clone())
        .unwrap_or_default();

    let (roles, set_roles) = signal(Vec::<DiscordRole>::new());
    let (channels, set_channels) = signal(Vec::<DiscordChannel>::new());
    let (message, set_message) = signal(String::new());
    spawn_local(async move {
        if let Err(why) = fetch_and_set_data(&guild_id, set_roles, set_channels).await {
            log!("Error fetching data: {why:#?}")
        }
    });

    view! {
        <div class="flex min-h-screen bg-gray-900 text-white">
            <Sidebar />
            <div class="flex-1 flex flex-col">
                <Header title="Bot Configuration" />
                <div class="p-6 grid grid-cols-2 gap-6">
                    <RoleDropdown
                        title="Admin Roles"
                        index={0}
                        allow_multiple=true
                        roles=roles
                        active_dropdown=active_dropdown
                    />
                    <RoleDropdown
                        title="Forbidden Roles"
                        index={1}
                        allow_multiple=true
                        roles=roles
                        active_dropdown=active_dropdown
                    />
                    <ChannelDropdown
                        title="Timeout Duration"
                        index={2}
                        allow_multiple=false
                        channels=channels
                        active_dropdown=active_dropdown
                    />
                    <ChannelDropdown
                        title="Welcome Channel"
                        index={3}
                        allow_multiple=false
                        channels=channels
                        active_dropdown=active_dropdown
                    />
                    <ChannelDropdown
                        title="Logs Channel"
                        index={4}
                        allow_multiple=false
                        channels=channels
                        active_dropdown=active_dropdown
                    />
                    <ChannelDropdown
                        title="Exceptions Channel"
                        index={5}
                        allow_multiple=false
                        channels=channels
                        active_dropdown=active_dropdown
                    />
                    <ChannelDropdown
                        title="OOC Channel"
                        index={6}
                        allow_multiple=false
                        channels=channels
                        active_dropdown=active_dropdown
                    />
                    <ChannelDropdown
                        title="Forbidden User"
                        index={7}
                        allow_multiple=false
                        channels=channels
                        active_dropdown=active_dropdown
                    />
                </div>
                <div class="p-6 grid grid-cols-2 gap-6">
                    <TextCard
                        title="Warn Message"
                        placeholder="Tu mensaje aquí"
                        on_change=set_message
                    />
                    <TextCard
                        title="Timeout Message"
                        placeholder="Tu mensaje aquí"
                        on_change=set_message
                    />
                    <TextCard
                        title="Welcome Message"
                        placeholder="Tu mensaje aquí"
                        on_change=set_message
                    />
                </div>
            </div>
        </div>
    };
}

async fn fetch_and_parse<T: DeserializeOwned + Debug>(
    client: &Client,
    url: &str,
) -> Result<T, String> {
    let response = client
        .get(url)
        .send()
        .await
        .map_err(|why| format!("Error al conectar con la API: {why}"))?;

    if !response.status().is_success() {
        return Err(format!("Error en la respuesta: {}", response.status()));
    }

    response
        .json::<T>()
        .await
        .map_err(|why| format!("Error al deserializar el JSON: {why}"))
}

async fn fetch_and_set_data(
    guild_id: &str,
    set_roles: WriteSignal<Vec<DiscordRole>>,
    set_channels: WriteSignal<Vec<DiscordChannel>>
) -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let roles_url = format!("http://localhost:3000/api/roles/{guild_id}");
    let channels_url = format!("http://localhost:3000/api/channels/{guild_id}");

    let roles = fetch_and_parse::<Vec<DiscordRole>>(&client, &roles_url).await?;
    let channels = fetch_and_parse::<Vec<DiscordChannel>>(&client, &channels_url).await?;

    set_roles.set(roles);
    set_channels.set(channels);

    Ok(())
}

how can I set the signals without having this panic? i'm kind of new with Leptos FullStack

[gbj]

By the time this finishes running

    spawn_local(async move {
        if let Err(why) = fetch_and_set_data(&guild_id, set_roles, set_channels).await {
            log!("Error fetching data: {why:#?}")
        }
    });

and tries to set the data, the entire page has already been rendered and sent to the client and has been thrown away.

If you're trying to load some async data to use in server rendering, you should be using resources and Suspense. Here's the relevant section of the docs.