~repos /rust-embed

#rust#proc-macro#http

git clone https://pyrossh.dev/repos/rust-embed.git

rust macro which loads files into the rust binary at compile time during release and loads the file from the fs during dev.

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9c65ce09 — Day Fisher

1 year ago 
simple metadata_only
Files changed (1) hide show
  1. impl/src/lib.rs +38 -5
impl/src/lib.rs CHANGED
@@ -16,6 +16,7 @@ use syn::{parse_macro_input, Data, DeriveInput, Expr, ExprLit, Fields, Lit, Meta
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  fn embedded(
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  ident: &syn::Ident, relative_folder_path: Option<&str>, absolute_folder_path: String, prefix: Option<&str>, includes: &[String], excludes: &[String],
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+ metadata_only: bool,
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  ) -> syn::Result<TokenStream2> {
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  extern crate rust_embed_utils;
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@@ -25,7 +26,10 @@ fn embedded(
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  let includes: Vec<&str> = includes.iter().map(AsRef::as_ref).collect();
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  let excludes: Vec<&str> = excludes.iter().map(AsRef::as_ref).collect();
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  for rust_embed_utils::FileEntry { rel_path, full_canonical_path } in rust_embed_utils::get_files(absolute_folder_path.clone(), &includes, &excludes) {
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+ match_values.insert(
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+ rel_path.clone(),
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- match_values.insert(rel_path.clone(), embed_file(relative_folder_path, ident, &rel_path, &full_canonical_path)?);
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+ embed_file(relative_folder_path, ident, &rel_path, &full_canonical_path, metadata_only)?,
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+ );
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  list_values.push(if let Some(prefix) = prefix {
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  format!("{}{}", prefix, rel_path)
@@ -187,6 +191,7 @@ fn dynamic(ident: &syn::Ident, folder_path: String, prefix: Option<&str>, includ
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  fn generate_assets(
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  ident: &syn::Ident, relative_folder_path: Option<&str>, absolute_folder_path: String, prefix: Option<String>, includes: Vec<String>, excludes: Vec<String>,
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+ metadata_only: bool,
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  ) -> syn::Result<TokenStream2> {
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  let embedded_impl = embedded(
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  ident,
@@ -195,6 +200,7 @@ fn generate_assets(
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  prefix.as_deref(),
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  &includes,
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  &excludes,
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+ metadata_only,
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  );
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  if cfg!(feature = "debug-embed") {
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  return embedded_impl;
@@ -208,7 +214,7 @@ fn generate_assets(
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  })
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  }
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- fn embed_file(folder_path: Option<&str>, ident: &syn::Ident, rel_path: &str, full_canonical_path: &str) -> syn::Result<TokenStream2> {
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+ fn embed_file(folder_path: Option<&str>, ident: &syn::Ident, rel_path: &str, full_canonical_path: &str, metadata_only: bool) -> syn::Result<TokenStream2> {
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  let file = rust_embed_utils::read_file_from_fs(Path::new(full_canonical_path)).expect("File should be readable");
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  let hash = file.metadata.sha256_hash();
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  let last_modified = match file.metadata.last_modified() {
@@ -227,7 +233,11 @@ fn embed_file(folder_path: Option<&str>, ident: &syn::Ident, rel_path: &str, ful
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  #[cfg(not(feature = "mime-guess"))]
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  let mimetype_tokens = TokenStream2::new();
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+ let embedding_code = if metadata_only {
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+ quote! {
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+ const BYTES: &'static [u8] = &[];
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+ }
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- let embedding_code = if cfg!(feature = "compression") {
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+ } else if cfg!(feature = "compression") {
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  let folder_path = folder_path.ok_or(syn::Error::new(ident.span(), "`folder` must be provided under `compression` feature."))?;
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  // Print some debugging information
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  let full_relative_path = PathBuf::from_iter([folder_path, rel_path]);
@@ -273,6 +283,20 @@ fn find_attribute_values(ast: &syn::DeriveInput, attr_name: &str) -> Vec<String>
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  .collect()
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  }
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+ fn find_bool_attribute(ast: &syn::DeriveInput, attr_name: &str) -> Option<bool> {
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+ ast
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+ .attrs
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+ .iter()
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+ .find(|value| value.path().is_ident(attr_name))
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+ .and_then(|attr| match &attr.meta {
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+ Meta::NameValue(MetaNameValue {
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+ value: Expr::Lit(ExprLit { lit: Lit::Bool(val), .. }),
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+ ..
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+ }) => Some(val.value()),
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+ _ => None,
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+ })
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+ }
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+
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  fn impl_rust_embed(ast: &syn::DeriveInput) -> syn::Result<TokenStream2> {
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  match ast.data {
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  Data::Struct(ref data) => match data.fields {
@@ -294,6 +318,7 @@ fn impl_rust_embed(ast: &syn::DeriveInput) -> syn::Result<TokenStream2> {
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  let prefix = find_attribute_values(ast, "prefix").into_iter().next();
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  let includes = find_attribute_values(ast, "include");
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  let excludes = find_attribute_values(ast, "exclude");
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+ let metadata_only = find_bool_attribute(ast, "metadata_only").unwrap_or(false);
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  #[cfg(not(feature = "include-exclude"))]
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  if !includes.is_empty() || !excludes.is_empty() {
@@ -340,10 +365,18 @@ fn impl_rust_embed(ast: &syn::DeriveInput) -> syn::Result<TokenStream2> {
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  return Err(syn::Error::new_spanned(ast, message));
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  };
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+ generate_assets(
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+ &ast.ident,
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- generate_assets(&ast.ident, relative_path.as_deref(), absolute_folder_path, prefix, includes, excludes)
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+ relative_path.as_deref(),
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+ absolute_folder_path,
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+ prefix,
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+ includes,
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+ excludes,
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+ metadata_only,
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+ )
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  }
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- #[proc_macro_derive(RustEmbed, attributes(folder, prefix, include, exclude))]
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+ #[proc_macro_derive(RustEmbed, attributes(folder, prefix, include, exclude, metadata_only))]
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  pub fn derive_input_object(input: TokenStream) -> TokenStream {
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  let ast = parse_macro_input!(input as DeriveInput);
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  match impl_rust_embed(&ast) {