stop kebab-casing and validate component names (#1294)

* stop kebab-casing and validate component names

* tests

* validate  for wasm-compose

* don't validate , change name to composition-root

* new tests in

* lose import map cow and shorten compostition root name

Author: macovedj

crates/wasm-compose/CONFIG.md

@@ -7,16 +7,16 @@ To specify the configuration file to use, pass the `--config` option to
 
 The configuration file has the following top-level fields:
 
-* `search-paths` : `list<string>` (optional) - a list of paths to search for
-dependencies.
-* `skip-validation` : `bool` (optional) - a boolean indicating whether to skip
-validation of the resulting composed component.
-* `dependencies` : `map<string, dependency>` (optional) - a map specifying the
-explicit locations of transitive dependencies.
-* `instantiations` : `map<string, instantiation>` (optional) - a map specifying
-the explicit instantiations of transitive dependencies.
-* `definitions` : `list<string>` (optional) - a list of paths to _definition_
-components.
+- `search-paths` : `list<string>` (optional) - a list of paths to search for
+  dependencies.
+- `skip-validation` : `bool` (optional) - a boolean indicating whether to skip
+  validation of the resulting composed component.
+- `dependencies` : `map<string, dependency>` (optional) - a map specifying the
+  explicit locations of transitive dependencies.
+- `instantiations` : `map<string, instantiation>` (optional) - a map specifying
+  the explicit instantiations of transitive dependencies.
+- `definitions` : `list<string>` (optional) - a list of paths to _definition_
+  components.
 
 ## Dependencies
 
@@ -25,10 +25,10 @@ dependency, rather than searching the configured search paths.
 
 A dependency has the following fields:
 
-* `path` : `string` - the path to the WebAssembly component file; the path is
+- `path` : `string` - the path to the WebAssembly component file; the path is
   relative to the configuration file.
 
-* `import` : `string` (optional) - the name to use for importing the component.
+- `import` : `string` (optional) - the name to use for importing the component.
   If not present, the component at the given path will be defined directly in
   the composed component.
 
@@ -49,11 +49,11 @@ dependencies:
 
 In the above example, two dependencies are defined in the configuration:
 
-* `a` - the contents of `a.wasm` will be defined directly in the composed
-component.
-* `b` - a component of the same type as `b.wasm` will be imported in the
-composed component with name `b`; the original file will not be embedded in the
-composed component.
+- `a` - the contents of `a.wasm` will be defined directly in the composed
+  component.
+- `b` - a component of the same type as `b.wasm` will be imported in the
+  composed component with name `b`; the original file will not be embedded in the
+  composed component.
 
 _Note: importing components from a composed component is not currently
 supported in [Wasmtime](https://github.com/bytecodealliance/wasmtime)._
@@ -68,19 +68,19 @@ instantiated, even allowing a dependency to be instantiated multiple times.
 
 An instantiation has the following fields:
 
-* `dependency` : `string` (optional) - the name of the dependency to
+- `dependency` : `string` (optional) - the name of the dependency to
   instantiate.
 
   If unspecified, the instantiation will be for a dependency of the same name
   as the instantiation itself.
 
-* `arguments` : `map<string, argument>` (optional) - a mapping of argument
+- `arguments` : `map<string, argument>` (optional) - a mapping of argument
   names to arguments.
 
   Argument names match the names of the imports of the dependency being
   instantiated.
 
-Note that the instantiation name `$input` is special and signifies how the input
+Note that the instantiation name `root` is special and signifies how the input
 component is to be instantiated.
 
 ### Instantiation arguments
@@ -90,9 +90,9 @@ to the instantiation of a dependency.
 
 An argument has the following fields:
 
-* `instance` : `string` - the name of the instance to pass as the argument.
+- `instance` : `string` - the name of the instance to pass as the argument.
 
-* `export` : `string` (optional) - the name of the exported instance on
+- `export` : `string` (optional) - the name of the exported instance on
   `instance` to use as the argument.
 
   If not present, the instance specified by `instance` will be passed directly.
@@ -106,7 +106,7 @@ A slightly complex example of configuring instantiations:
 
 ```yaml
 instantiations:
-  $input:
+  root:
     arguments:
       a: b
   b:
@@ -118,7 +118,7 @@ instantiations:
     dependency: f
 ```
 
-In the above example, the `$input` instantiation (i.e. the root instantiation)
+In the above example, the `root` instantiation (i.e. the root instantiation)
 has explicitly specified that the argument named `a` is to be provided instance
 `b`.
 

crates/wasm-compose/example/server/config.yml

@@ -2,7 +2,7 @@ search-paths:
   - ../service/target/wasm32-wasi/release
 
 instantiations:
-  $input:
+  root:
     arguments:
       example:service/[email protected]:
         instance: svc

crates/wasm-compose/src/composer.rs

@@ -17,7 +17,7 @@ use wasmparser::{
 };
 
 /// The root component name used in configuration.
-pub const ROOT_COMPONENT_NAME: &str = "$input";
+pub const ROOT_COMPONENT_NAME: &str = "root";
 
 /// A reference to an instance import on a component.
 #[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]

crates/wasm-compose/src/encoding.rs

@@ -2,7 +2,6 @@ use crate::graph::{
     type_desc, CompositionGraph, EncodeOptions, ExportIndex, ImportIndex, InstanceId,
 };
 use anyhow::{anyhow, bail, Result};
-use heck::ToKebabCase;
 use indexmap::{IndexMap, IndexSet};
 use petgraph::EdgeDirection;
 use smallvec::SmallVec;
@@ -1038,7 +1037,7 @@ enum ImportMapEntry<'a> {
 /// Represents the import map built during the encoding
 /// of a composition graph.
 #[derive(Default)]
-struct ImportMap<'a>(IndexMap<Cow<'a, str>, ImportMapEntry<'a>>);
+struct ImportMap<'a>(IndexMap<&'a str, ImportMapEntry<'a>>);
 
 impl<'a> ImportMap<'a> {
     fn new(import_components: bool, graph: &'a CompositionGraph) -> Result<Self> {
@@ -1062,7 +1061,7 @@ impl<'a> ImportMap<'a> {
             assert!(self
                 .0
                 .insert(
-                    entry.component.name.to_kebab_case().into(),
+                    &entry.component.name,
                     ImportMapEntry::Component(&entry.component),
                 )
                 .is_none());

crates/wasm-compose/src/graph.rs

@@ -11,6 +11,7 @@ use std::{
     sync::atomic::{AtomicUsize, Ordering},
 };
 use wasmparser::{
+    names::ComponentName,
     types::{
         ComponentAnyTypeId, ComponentEntityType, ComponentInstanceTypeId, Remap, Remapping,
         ResourceId, SubtypeCx, Types, TypesRef,
@@ -48,12 +49,11 @@ pub struct Component<'a> {
 
 impl<'a> Component<'a> {
     /// Constructs a new component from reading the given file.
-    pub fn from_file(name: impl Into<String>, path: impl AsRef<Path>) -> Result<Self> {
+    pub fn from_file(name: &str, path: impl AsRef<Path>) -> Result<Self> {
         let path = path.as_ref();
         log::info!("parsing WebAssembly component file `{}`", path.display());
-
         let component = Self::parse(
-            name.into(),
+            ComponentName::new(name, 0)?.to_string(),
             Some(path.to_owned()),
             wat::parse_file(path)
                 .with_context(|| {
@@ -83,8 +83,12 @@ impl<'a> Component<'a> {
         }
 
         log::info!("parsing WebAssembly component from bytes");
-        let component =
-            Self::parse(name.into(), None, bytes).context("failed to parse component")?;
+        let component = Self::parse(
+            ComponentName::new(&name.into(), 0)?.to_string(),
+            None,
+            bytes,
+        )
+        .context("failed to parse component")?;
 
         log::debug!("WebAssembly component parsed:\n{component:#?}",);
 

crates/wasm-compose/tests/compositions/complex-import/composed.wat

@@ -14,7 +14,7 @@
       (export (;1;) "m2" (func (type 1)))
     )
   )
-  (import "input" (component (;0;) (type 0)))
+  (import "root" (component (;0;) (type 0)))
   (type (;1;)
     (component
       (type (;0;)

crates/wasm-compose/tests/compositions/conflict-on-import/error.txt

@@ -1 +1 @@
-cannot import instance with name `a` for an instantiation argument of component `b` because it conflicts with an imported instantiation argument of component `$input`
+cannot import instance with name `a` for an instantiation argument of component `b` because it conflicts with an imported instantiation argument of component `root`

crates/wasm-compose/tests/compositions/connect-resources/config.yml

@@ -1,5 +1,5 @@
 instantiations:
-  $input:
+  root:
     arguments:
       example:service/[email protected]:
         instance: logger

crates/wasm-compose/tests/compositions/def-mismatch/error.txt

@@ -1,4 +1,4 @@
-failed to connect instance `$input` to definition component `tests/compositions/def-mismatch/definitions.wat`
+failed to connect instance `root` to definition component `tests/compositions/def-mismatch/definitions.wat`
 
 Caused by:
     source instance export `foo` is not compatible with target instance import `foo`

crates/wasm-compose/tests/compositions/export-on-import/config.yml

@@ -1,5 +1,5 @@
 instantiations:
-  $input:
+  root:
     arguments:
       a:
         instance: a