resuma 0.4.5

Resuma - SSR + Resumability + Islands + Server Actions + JS Bridge for Rust
Documentation 
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//! Server-side data loading — `#[load]` handlers run before page render.

use crate::core::view::View;
use serde::{Deserialize, Serialize};
use serde_json::Value;

use super::request::FlowRequest;

/// Result of a `#[load]` handler exposed to components.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "status", rename_all = "snake_case")]
pub enum LoadValue<T> {
    Ok(T),
    Err(LoaderError),
    Pending,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LoaderError {
    pub status: u16,
    pub message: String,
}

impl std::fmt::Display for LoaderError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{} (status {})", self.message, self.status)
    }
}

impl LoaderError {
    pub fn new(status: u16, message: impl Into<String>) -> Self {
        Self {
            status,
            message: message.into(),
        }
    }
}

/// Render a `LoadValue` from `#[load]` with explicit pending and error branches.
pub fn load_boundary<T>(
    load: LoadValue<T>,
    ok: impl FnOnce(T) -> View,
    err: impl FnOnce(LoaderError) -> View,
    pending: impl FnOnce() -> View,
) -> View {
    match load {
        LoadValue::Ok(v) => ok(v),
        LoadValue::Err(e) => err(e),
        LoadValue::Pending => pending(),
    }
}

/// Type-erased loader dispatch signature used by the Flow registry.
pub type LoadFn = fn(&FlowRequest) -> LoadDispatch;

pub enum LoadDispatch {
    Ready(Value),
    Pending,
}