Metadata difference command

cli/src/commands/explore/mod.rs

@@ -80,7 +80,6 @@ pub enum PalletSubcommand {
     Storage(StorageSubcommand),
 }
 
-/// cargo run -- explore --file=../artifacts/polkadot_metadata.scale
 pub async fn run(opts: Opts, output: &mut impl std::io::Write) -> color_eyre::Result<()> {
     // get the metadata
     let bytes = opts.file_or_url.fetch().await?;

cli/src/commands/explore/storage.rs

@@ -47,7 +47,7 @@ pub async fn explore_storage(
     };
 
     // if specified call storage entry wrong, show user the storage entries to choose from (but this time as an error):
-    let Some(storage) = storage_metadata.entries().find(|entry| entry.name().to_lowercase() == entry_name.to_lowercase()) else {
+    let Some(storage) = storage_metadata.entries().iter().find(|entry| entry.name().to_lowercase() == entry_name.to_lowercase()) else {
         let storage_entries = print_available_storage_entries(storage_metadata, pallet_name);
         let description = format!("Usage:\n    subxt explore {pallet_name} storage <STORAGE_ENTRY>\n        view details for a specific storage entry\n\n{storage_entries}");
         return Err(eyre!("Storage entry \"{entry_name}\" not found in \"{pallet_name}\" pallet!\n\n{description}"));
@@ -164,14 +164,18 @@ fn print_available_storage_entries(
     storage_metadata: &StorageMetadata,
     pallet_name: &str,
 ) -> String {
-    if storage_metadata.entries().len() == 0 {
+    if storage_metadata.entries().is_empty() {
         format!("No <STORAGE_ENTRY>'s available in the \"{pallet_name}\" pallet.")
     } else {
         let mut output = format!(
             "Available <STORAGE_ENTRY>'s in the \"{}\" pallet:",
             pallet_name
         );
-        let mut strings: Vec<_> = storage_metadata.entries().map(|s| s.name()).collect();
+        let mut strings: Vec<_> = storage_metadata
+            .entries()
+            .iter()
+            .map(|s| s.name())
+            .collect();
         strings.sort();
         for entry in strings {
             write!(output, "\n    {}", entry).unwrap();

cli/src/commands/mod.rs

@@ -4,6 +4,7 @@
 
 pub mod codegen;
 pub mod compatibility;
+pub mod diff;
 pub mod explore;
 pub mod metadata;
 pub mod version;

cli/src/main.rs

@@ -15,6 +15,7 @@ enum Command {
     Metadata(commands::metadata::Opts),
     Codegen(commands::codegen::Opts),
     Compatibility(commands::compatibility::Opts),
+    Diff(commands::diff::Opts),
     Version(commands::version::Opts),
     Explore(commands::explore::Opts),
 }
@@ -28,6 +29,7 @@ async fn main() -> color_eyre::Result<()> {
         Command::Metadata(opts) => commands::metadata::run(opts, &mut output).await,
         Command::Codegen(opts) => commands::codegen::run(opts, &mut output).await,
         Command::Compatibility(opts) => commands::compatibility::run(opts, &mut output).await,
+        Command::Diff(opts) => commands::diff::run(opts, &mut output).await,
         Command::Version(opts) => commands::version::run(opts, &mut output),
         Command::Explore(opts) => commands::explore::run(opts, &mut output).await,
     }

cli/src/utils.rs

@@ -5,14 +5,16 @@
 use clap::Args;
 use color_eyre::eyre;
 
+use std::str::FromStr;
 use std::{fs, io::Read, path::PathBuf};
+
 use subxt_codegen::utils::{MetadataVersion, Uri};
 
 pub mod type_description;
 pub mod type_example;
 
 /// The source of the metadata.
-#[derive(Debug, Args)]
+#[derive(Debug, Args, Clone)]
 pub struct FileOrUrl {
     /// The url of the substrate node to query for metadata for codegen.
     #[clap(long, value_parser)]
@@ -94,3 +96,26 @@ pub fn with_indent(s: String, indent: usize) -> String {
         .collect::<Vec<_>>()
         .join("\n")
 }
+
+impl FromStr for FileOrUrl {
+    type Err = &'static str;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let path = std::path::Path::new(s);
+        if path.exists() {
+            Ok(FileOrUrl {
+                url: None,
+                file: Some(PathBuf::from(s)),
+                version: None,
+            })
+        } else {
+            Uri::from_str(s)
+                .map_err(|_| "no path or uri could be crated")
+                .map(|uri| FileOrUrl {
+                    url: Some(uri),
+                    file: None,
+                    version: None,
+                })
+        }
+    }
+}

codegen/src/api/storage.rs

@@ -30,11 +30,12 @@ pub fn generate_storage(
     should_gen_docs: bool,
 ) -> Result<TokenStream2, CodegenError> {
     let Some(storage) = pallet.storage() else {
-        return Ok(quote!())
+        return Ok(quote!());
     };
 
     let storage_fns = storage
         .entries()
+        .iter()
         .map(|entry| {
             generate_storage_entry_fns(type_gen, pallet, entry, crate_path, should_gen_docs)
         })
@@ -104,7 +105,7 @@ fn generate_storage_entry_fns(
     let pallet_name = pallet.name();
     let storage_name = storage_entry.name();
     let Some(storage_hash) = pallet.storage_hash(storage_name) else {
-        return Err(CodegenError::MissingStorageMetadata(pallet_name.into(), storage_name.into()))
+        return Err(CodegenError::MissingStorageMetadata(pallet_name.into(), storage_name.into()));
     };
 
     let fn_name = format_ident!("{}", storage_entry.name().to_snake_case());
@@ -157,7 +158,7 @@ fn generate_storage_entry_fns(
     // so expose a function to create this entry, too:
     let root_entry_fn = if is_map_type {
         let fn_name_root = format_ident!("{}_root", fn_name);
-        quote! (
+        quote!(
             #docs
             pub fn #fn_name_root(
                 &self,

metadata/src/lib.rs

@@ -20,7 +20,7 @@ mod from_into;
 mod utils;
 
 use scale_info::{form::PortableForm, PortableRegistry, Variant};
-use std::collections::HashMap;
+use std::collections::{HashMap, HashSet};
 use std::sync::Arc;
 use utils::ordered_map::OrderedMap;
 use utils::variant_index::VariantIndex;
@@ -138,6 +138,16 @@ impl Metadata {
     {
         utils::retain::retain_metadata(self, pallet_filter, api_filter);
     }
+
+    /// Get type hash for a type in the registry
+    pub fn type_hash(&self, id: u32) -> Option<[u8; 32]> {
+        self.types.resolve(id)?;
+        Some(crate::utils::validation::get_type_hash(
+            &self.types,
+            id,
+            &mut HashSet::<u32>::new(),
+        ))
+    }
 }
 
 /// Metadata for a specific pallet.
@@ -303,8 +313,8 @@ impl StorageMetadata {
     }
 
     /// An iterator over the storage entries.
-    pub fn entries(&self) -> impl ExactSizeIterator<Item = &StorageEntryMetadata> {
-        self.entries.values().iter()
+    pub fn entries(&self) -> &[StorageEntryMetadata] {
+        self.entries.values()
     }
 
     /// Return a specific storage entry given its name.
@@ -387,7 +397,7 @@ pub enum StorageHasher {
 }
 
 /// Is the storage entry optional, or does it have a default value.
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, Eq, PartialEq)]
 pub enum StorageEntryModifier {
     /// The storage entry returns an `Option<T>`, with `None` if the key is not present.
     Optional,
@@ -490,7 +500,7 @@ pub struct RuntimeApiMetadata<'a> {
 
 impl<'a> RuntimeApiMetadata<'a> {
     /// Trait name.
-    pub fn name(&self) -> &str {
+    pub fn name(&self) -> &'a str {
         &self.inner.name
     }
     /// Trait documentation.
@@ -509,6 +519,11 @@ impl<'a> RuntimeApiMetadata<'a> {
     pub fn method_hash(&self, method_name: &str) -> Option<[u8; 32]> {
         crate::utils::validation::get_runtime_api_hash(self, method_name)
     }
+
+    /// Return a hash for the runtime API trait.
+    pub fn hash(&self) -> [u8; 32] {
+        crate::utils::validation::get_runtime_trait_hash(*self)
+    }
 }
 
 #[derive(Debug, Clone)]

metadata/src/utils/validation.rs

@@ -175,7 +175,7 @@ fn get_type_def_hash(
 }
 
 /// Obtain the hash representation of a `scale_info::Type` identified by id.
-fn get_type_hash(
+pub fn get_type_hash(
     registry: &PortableRegistry,
     id: u32,
     visited_ids: &mut HashSet<u32>,
@@ -283,7 +283,7 @@ fn get_runtime_method_hash(
 }
 
 /// Obtain the hash of all of a runtime API trait, including all of its methods.
-fn get_runtime_trait_hash(trait_metadata: RuntimeApiMetadata) -> [u8; HASH_LEN] {
+pub fn get_runtime_trait_hash(trait_metadata: RuntimeApiMetadata) -> [u8; HASH_LEN] {
     let mut visited_ids = HashSet::new();
     let trait_name = &*trait_metadata.inner.name;
     let method_bytes = trait_metadata
@@ -379,14 +379,17 @@ pub fn get_pallet_hash(pallet: PalletMetadata) -> [u8; HASH_LEN] {
     let storage_bytes = match pallet.storage() {
         Some(storage) => {
             let prefix_hash = hash(storage.prefix().as_bytes());
-            let entries_hash = storage.entries().fold([0u8; HASH_LEN], |bytes, entry| {
-                // We don't care what order the storage entries occur in, so XOR them together
-                // to make the order irrelevant.
-                xor(
-                    bytes,
-                    get_storage_entry_hash(registry, entry, &mut visited_ids),
-                )
-            });
+            let entries_hash = storage
+                .entries()
+                .iter()
+                .fold([0u8; HASH_LEN], |bytes, entry| {
+                    // We don't care what order the storage entries occur in, so XOR them together
+                    // to make the order irrelevant.
+                    xor(
+                        bytes,
+                        get_storage_entry_hash(registry, entry, &mut visited_ids),
+                    )
+                });
             concat_and_hash2(&prefix_hash, &entries_hash)
         }
         None => [0u8; HASH_LEN],
@@ -496,6 +499,7 @@ mod tests {
     struct A {
         pub b: Box<B>,
     }
+
     #[allow(dead_code)]
     #[derive(scale_info::TypeInfo)]
     struct B {
@@ -507,6 +511,7 @@ mod tests {
     #[derive(scale_info::TypeInfo)]
     // TypeDef::Composite with TypeDef::Array with Typedef::Primitive.
     struct AccountId32([u8; HASH_LEN]);
+
     #[allow(dead_code)]
     #[derive(scale_info::TypeInfo)]
     // TypeDef::Variant.
@@ -525,6 +530,7 @@ mod tests {
         // TypeDef::BitSequence.
         BitSeq(BitVec<u8, Lsb0>),
     }
+
     #[allow(dead_code)]
     #[derive(scale_info::TypeInfo)]
     // Ensure recursive types and TypeDef variants are captured.
@@ -533,6 +539,7 @@ mod tests {
         composite: AccountId32,
         type_def: DigestItem,
     }
+
     #[allow(dead_code)]
     #[derive(scale_info::TypeInfo)]
     // Simulate a PalletCallMetadata.