NotAShelf
119f6d2e06
Signed-off-by: NotAShelf <raf@notashelf.dev> Change-Id: I7c9ccac175440d278fd129dbd53f04d66a6a6964
101 lines
2.7 KiB
Rust
101 lines
2.7 KiB
Rust
//! Media Stats UI - Pinakes plugin
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//!
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//! A UI-only plugin that adds a library statistics dashboard and a tag manager
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//! page. All UI definitions live in `pages/stats.json` and
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//! `pages/tag-manager.json`; this WASM binary provides the minimum lifecycle
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//! surface the host runtime requires.
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//!
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//! This plugin is kind = ["ui_page"]: no media-type, metadata, thumbnail, or
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//! event-handler extension points are needed. The host will never call them,
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//! but exporting them avoids linker warnings if the host performs capability
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//! discovery via symbol inspection.
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#![no_std]
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extern crate alloc;
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use core::alloc::Layout;
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#[global_allocator]
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static ALLOC: dlmalloc::GlobalDlmalloc = dlmalloc::GlobalDlmalloc;
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#[panic_handler]
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fn panic(_: &core::panic::PanicInfo) -> ! {
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core::arch::wasm32::unreachable()
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}
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// Host functions provided by the Pinakes runtime.
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unsafe extern "C" {
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// Write a result value back to the host (ptr + byte length).
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fn host_set_result(ptr: i32, len: i32);
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// Emit a structured log message to the host logger.
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// `level` mirrors tracing severity: 0=trace 1=debug 2=info 3=warn 4=error
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fn host_log(level: i32, ptr: i32, len: i32);
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}
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/// # Safety
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///
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/// `json` is a valid slice; the host copies the bytes before
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/// returning so there are no lifetime concerns.
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fn set_response(json: &[u8]) {
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unsafe { host_set_result(json.as_ptr() as i32, json.len() as i32) }
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}
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/// # Safety
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///
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/// Same as [`set_response`]
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fn log_info(msg: &[u8]) {
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unsafe { host_log(2, msg.as_ptr() as i32, msg.len() as i32) }
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}
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/// Allocate a buffer for the host to write request data into.
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///
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/// # Returns
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///
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/// The byte offset of the allocation, or -1 on failure.
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///
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/// # Safety
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///
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/// Size is positive; Layout construction cannot fail for align=1.
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#[unsafe(no_mangle)]
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pub extern "C" fn alloc(size: i32) -> i32 {
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if size <= 0 {
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return 0;
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}
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unsafe {
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let layout = Layout::from_size_align_unchecked(size as usize, 1);
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let ptr = alloc::alloc::alloc(layout);
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if ptr.is_null() { -1 } else { ptr as i32 }
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}
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}
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/// Called once after the plugin is loaded. Returns 0 on success.
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#[unsafe(no_mangle)]
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pub extern "C" fn initialize() -> i32 {
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log_info(b"media-stats-ui: initialized");
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0
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}
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/// Called before the plugin is unloaded. Returns 0 on success.
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#[unsafe(no_mangle)]
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pub extern "C" fn shutdown() -> i32 {
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log_info(b"media-stats-ui: shutdown");
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0
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}
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/// # Returns
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///
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/// an empty JSON array; this plugin adds no custom media types.
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#[unsafe(no_mangle)]
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pub extern "C" fn supported_media_types(_ptr: i32, _len: i32) {
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set_response(b"[]");
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}
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/// # Returns
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///
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/// An empty JSON array; this plugin handles no event types.
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#[unsafe(no_mangle)]
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pub extern "C" fn interested_events(_ptr: i32, _len: i32) {
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set_response(b"[]");
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}
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