update syn to 2 in web codegen (#3081)

actix-multipart-derive/CHANGES.md

@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+- Update `syn` dependency to `2`.
 - Minimum supported Rust version (MSRV) is now 1.65 due to transitive `time` dependency.
 
 ## 0.6.0 - 2023-02-26

actix-multipart-derive/Cargo.toml

@@ -17,11 +17,11 @@ all-features = true
 proc-macro = true
 
 [dependencies]
-darling = "0.14"
+darling = "0.20"
 parse-size = "1"
 proc-macro2 = "1"
 quote = "1"
-syn = "1"
+syn = "2"
 
 [dev-dependencies]
 actix-multipart = "0.6"

actix-router/src/resource.rs

@@ -252,7 +252,7 @@ impl ResourceDef {
     /// Multi-pattern resources can be constructed by providing a slice (or vec) of patterns.
     ///
     /// # Panics
-    /// Panics if path pattern is malformed.
+    /// Panics if any path patterns are malformed.
     ///
     /// # Examples
     /// ```
@@ -838,6 +838,7 @@ impl ResourceDef {
 
     fn construct<T: IntoPatterns>(paths: T, is_prefix: bool) -> Self {
         let patterns = paths.patterns();
+
         let (pat_type, segments) = match &patterns {
             Patterns::Single(pattern) => ResourceDef::parse(pattern, is_prefix, false),
 

actix-web-codegen/CHANGES.md

@@ -2,6 +2,7 @@
 
 ## Unreleased - 2023-xx-xx
 
+- Update `syn` dependency to `2`.
 - Minimum supported Rust version (MSRV) is now 1.65 due to transitive `time` dependency.
 
 ## 4.2.0 - 2023-02-26

actix-web-codegen/Cargo.toml

@@ -18,10 +18,10 @@ proc-macro = true
 actix-router = "0.5"
 proc-macro2 = "1"
 quote = "1"
-syn = { version = "1", features = ["full", "extra-traits"] }
+syn = { version = "2", features = ["full", "extra-traits"] }
 
 [dev-dependencies]
-actix-macros = "0.2.3"
+actix-macros = "0.2.4"
 actix-rt = "2.2"
 actix-test = "0.1"
 actix-utils = "3"

actix-web-codegen/src/route.rs

@@ -4,7 +4,54 @@ use actix_router::ResourceDef;
 use proc_macro::TokenStream;
 use proc_macro2::{Span, TokenStream as TokenStream2};
 use quote::{quote, ToTokens, TokenStreamExt};
-use syn::{parse_macro_input, AttributeArgs, Ident, LitStr, Meta, NestedMeta, Path};
+use syn::{punctuated::Punctuated, Ident, LitStr, Path, Token};
+
+#[derive(Debug)]
+pub struct RouteArgs {
+    path: syn::LitStr,
+    options: Punctuated<syn::MetaNameValue, Token![,]>,
+}
+
+impl syn::parse::Parse for RouteArgs {
+    fn parse(input: syn::parse::ParseStream<'_>) -> syn::Result<Self> {
+        // path to match: "/foo"
+        let path = input.parse::<syn::LitStr>().map_err(|mut err| {
+            err.combine(syn::Error::new(
+                err.span(),
+                r#"invalid service definition, expected #[<method>("<path>")]"#,
+            ));
+
+            err
+        })?;
+
+        // verify that path pattern is valid
+        let _ = ResourceDef::new(path.value());
+
+        // if there's no comma, assume that no options are provided
+        if !input.peek(Token![,]) {
+            return Ok(Self {
+                path,
+                options: Punctuated::new(),
+            });
+        }
+
+        // advance past comma separator
+        input.parse::<Token![,]>()?;
+
+        // if next char is a literal, assume that it is a string and show multi-path error
+        if input.cursor().literal().is_some() {
+            return Err(syn::Error::new(
+                Span::call_site(),
+                r#"Multiple paths specified! There should be only one."#,
+            ));
+        }
+
+        // zero or more options: name = "foo"
+        let options = input.parse_terminated(syn::MetaNameValue::parse, Token![,])?;
+
+        Ok(Self { path, options })
+    }
+}
 
 macro_rules! standard_method_type {
     (
@@ -182,70 +229,54 @@ struct Args {
 }
 
 impl Args {
-    fn new(args: AttributeArgs, method: Option<MethodType>) -> syn::Result<Self> {
+    fn new(args: RouteArgs, method: Option<MethodType>) -> syn::Result<Self> {
-        let mut path = None;
         let mut resource_name = None;
         let mut guards = Vec::new();
         let mut wrappers = Vec::new();
         let mut methods = HashSet::new();
 
-        if args.is_empty() {
-            return Err(syn::Error::new(
-                Span::call_site(),
-                format!(
-                    r#"invalid service definition, expected #[{}("<path>")]"#,
-                    method
-                        .map_or("route", |it| it.as_str())
-                        .to_ascii_lowercase()
-                ),
-            ));
-        }
-
         let is_route_macro = method.is_none();
         if let Some(method) = method {
             methods.insert(MethodTypeExt::Standard(method));
         }
 
-        for arg in args {
+        for nv in args.options {
-            match arg {
-                NestedMeta::Lit(syn::Lit::Str(lit)) => match path {
-                    None => {
-                        let _ = ResourceDef::new(lit.value());
-                        path = Some(lit);
-                    }
-                    _ => {
-                        return Err(syn::Error::new_spanned(
-                            lit,
-                            "Multiple paths specified! Should be only one!",
-                        ));
-                    }
-                },
-
-                NestedMeta::Meta(syn::Meta::NameValue(nv)) => {
             if nv.path.is_ident("name") {
-                        if let syn::Lit::Str(lit) = nv.lit {
+                if let syn::Expr::Lit(syn::ExprLit {
+                    lit: syn::Lit::Str(lit),
+                    ..
+                }) = nv.value
+                {
                     resource_name = Some(lit);
                 } else {
                     return Err(syn::Error::new_spanned(
-                                nv.lit,
+                        nv.value,
                         "Attribute name expects literal string!",
                     ));
                 }
             } else if nv.path.is_ident("guard") {
-                        if let syn::Lit::Str(lit) = nv.lit {
+                if let syn::Expr::Lit(syn::ExprLit {
+                    lit: syn::Lit::Str(lit),
+                    ..
+                }) = nv.value
+                {
                     guards.push(lit.parse::<Path>()?);
                 } else {
                     return Err(syn::Error::new_spanned(
-                                nv.lit,
+                        nv.value,
                         "Attribute guard expects literal string!",
                     ));
                 }
             } else if nv.path.is_ident("wrap") {
-                        if let syn::Lit::Str(lit) = nv.lit {
+                if let syn::Expr::Lit(syn::ExprLit {
+                    lit: syn::Lit::Str(lit),
+                    ..
+                }) = nv.value
+                {
                     wrappers.push(lit.parse()?);
                 } else {
                     return Err(syn::Error::new_spanned(
-                                nv.lit,
+                        nv.value,
                         "Attribute wrap expects type",
                     ));
                 }
@@ -255,19 +286,20 @@ impl Args {
                                 &nv,
                                 "HTTP method forbidden here. To handle multiple methods, use `route` instead",
                             ));
-                        } else if let syn::Lit::Str(ref lit) = nv.lit {
+                } else if let syn::Expr::Lit(syn::ExprLit {
-                            if !methods.insert(MethodTypeExt::try_from(lit)?) {
+                    lit: syn::Lit::Str(lit),
+                    ..
+                }) = nv.value.clone()
+                {
+                    if !methods.insert(MethodTypeExt::try_from(&lit)?) {
                         return Err(syn::Error::new_spanned(
-                                    &nv.lit,
+                            nv.value,
-                                    format!(
+                            format!("HTTP method defined more than once: `{}`", lit.value()),
-                                        "HTTP method defined more than once: `{}`",
-                                        lit.value()
-                                    ),
                         ));
                     }
                 } else {
                     return Err(syn::Error::new_spanned(
-                                nv.lit,
+                        nv.value,
                         "Attribute method expects literal string!",
                     ));
                 }
@@ -279,14 +311,8 @@ impl Args {
             }
         }
 
-                arg => {
-                    return Err(syn::Error::new_spanned(arg, "Unknown attribute."));
-                }
-            }
-        }
-
         Ok(Args {
-            path: path.unwrap(),
+            path: args.path,
             resource_name,
             guards,
             wrappers,
@@ -312,11 +338,7 @@ pub struct Route {
 }
 
 impl Route {
-    pub fn new(
+    pub fn new(args: RouteArgs, ast: syn::ItemFn, method: Option<MethodType>) -> syn::Result<Self> {
-        args: AttributeArgs,
-        ast: syn::ItemFn,
-        method: Option<MethodType>,
-    ) -> syn::Result<Self> {
         let name = ast.sig.ident.clone();
 
         // Try and pull out the doc comments so that we can reapply them to the generated struct.
@@ -324,7 +346,7 @@ impl Route {
         let doc_attributes = ast
             .attrs
             .iter()
-            .filter(|attr| attr.path.is_ident("doc"))
+            .filter(|attr| attr.path().is_ident("doc"))
             .cloned()
             .collect();
 
@@ -360,7 +382,7 @@ impl Route {
         let doc_attributes = ast
             .attrs
             .iter()
-            .filter(|attr| attr.path.is_ident("doc"))
+            .filter(|attr| attr.path().is_ident("doc"))
             .cloned()
             .collect();
 
@@ -455,7 +477,11 @@ pub(crate) fn with_method(
     args: TokenStream,
     input: TokenStream,
 ) -> TokenStream {
-    let args = parse_macro_input!(args as syn::AttributeArgs);
+    let args = match syn::parse(args) {
+        Ok(args) => args,
+        // on parse error, make IDEs happy; see fn docs
+        Err(err) => return input_and_compile_error(input, err),
+    };
 
     let ast = match syn::parse::<syn::ItemFn>(input.clone()) {
         Ok(ast) => ast,
@@ -480,7 +506,7 @@ pub(crate) fn with_methods(input: TokenStream) -> TokenStream {
     let (methods, others) = ast
         .attrs
         .into_iter()
-        .map(|attr| match MethodType::from_path(&attr.path) {
+        .map(|attr| match MethodType::from_path(attr.path()) {
             Ok(method) => Ok((method, attr)),
             Err(_) => Err(attr),
         })
@@ -492,13 +518,8 @@ pub(crate) fn with_methods(input: TokenStream) -> TokenStream {
         .into_iter()
         .map(Result::unwrap)
         .map(|(method, attr)| {
-            attr.parse_meta().and_then(|args| {
+            attr.parse_args()
-                if let Meta::List(args) = args {
+                .and_then(|args| Args::new(args, Some(method)))
-                    Args::new(args.nested.into_iter().collect(), Some(method))
-                } else {
-                    Err(syn::Error::new_spanned(attr, "Invalid input for macro"))
-                }
-            })
         })
         .collect::<Result<Vec<_>, _>>()
     {

actix-web-codegen/tests/trybuild/routes-missing-args-fail.stderr

@@ -1,4 +1,4 @@
-error: invalid service definition, expected #[get("<path>")]
+error: unexpected end of input, expected string literal
  --> tests/trybuild/routes-missing-args-fail.rs:4:1
   |
 4 | #[get]
@@ -6,11 +6,19 @@ error: invalid service definition, expected #[get("<path>")]
   |
   = note: this error originates in the attribute macro `get` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: Invalid input for macro
+error: invalid service definition, expected #[<method>("<path>")]
  --> tests/trybuild/routes-missing-args-fail.rs:4:1
   |
 4 | #[get]
   | ^^^^^^
+  |
+  = note: this error originates in the attribute macro `get` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: expected attribute arguments in parentheses: #[get(...)]
+ --> tests/trybuild/routes-missing-args-fail.rs:4:3
+  |
+4 | #[get]
+  |   ^^^
 
 error[E0277]: the trait bound `fn() -> impl std::future::Future<Output = String> {index}: HttpServiceFactory` is not satisfied
   --> tests/trybuild/routes-missing-args-fail.rs:13:55

actix-web-codegen/tests/trybuild/simple-fail.stderr

@@ -1,26 +1,42 @@
-error: Unknown attribute.
+error: expected `=`
- --> $DIR/simple-fail.rs:3:15
+ --> $DIR/simple-fail.rs:3:1
   |
 3 | #[get("/one", other)]
-  |               ^^^^^
+  | ^^^^^^^^^^^^^^^^^^^^^
+  |
+  = note: this error originates in the attribute macro `get` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: expected identifier or literal
+error: expected string literal
  --> $DIR/simple-fail.rs:8:8
   |
 8 | #[post(/two)]
   |        ^
 
-error: Unknown attribute.
+error: invalid service definition, expected #[<method>("<path>")]
+ --> $DIR/simple-fail.rs:8:8
+  |
+8 | #[post(/two)]
+  |        ^
+
+error: expected string literal
   --> $DIR/simple-fail.rs:15:9
    |
 15 | #[patch(PATCH_PATH)]
    |         ^^^^^^^^^^
 
-error: Multiple paths specified! Should be only one!
+error: invalid service definition, expected #[<method>("<path>")]
-  --> $DIR/simple-fail.rs:20:19
+  --> $DIR/simple-fail.rs:15:9
+   |
+15 | #[patch(PATCH_PATH)]
+   |         ^^^^^^^^^^
+
+error: Multiple paths specified! There should be only one.
+  --> $DIR/simple-fail.rs:20:1
    |
 20 | #[delete("/four", "/five")]
-   |                   ^^^^^^^
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: this error originates in the attribute macro `delete` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: HTTP method forbidden here. To handle multiple methods, use `route` instead
   --> $DIR/simple-fail.rs:25:19