Metadata V16: Be more dynamic over which hasher is used. (#1974)

* Use DynamicHasher256 to support Blake2 or Keccack depending on chain

* remove Config::Hash associated type, replace with HashFor<Config> alias

* Fix doc links

* fix wasm tests

* Don't strip system pallet associated types. check System.Hashing, not Hash. Rename BlockHash trait to Hash

* Tweak comment

* fmt

* fix merge

* Fix typo

testing/integration-tests/src/full_client/client/archive_rpcs.rs

@@ -16,7 +16,6 @@ use subxt::{
     client::OnlineClient,
     config::{Config, Hasher},
     utils::AccountId32,
-    SubstrateConfig,
 };
 use subxt_rpcs::methods::chain_head::{
     ArchiveStorageEventItem, Bytes, StorageQuery, StorageQueryType,
@@ -178,6 +177,7 @@ async fn archive_v1_storage() {
     let ctx = test_context().await;
     let rpc = ctx.chainhead_rpc_methods().await;
     let api = ctx.client();
+    let hasher = api.hasher();
     let mut blocks = fetch_finalized_blocks(&ctx, 3).await;
 
     while let Some(block) = blocks.next().await {
@@ -236,9 +236,7 @@ async fn archive_v1_storage() {
             ArchiveStorageEventItem {
                 key: Bytes(account_info_addr),
                 value: None,
-                hash: Some(<SubstrateConfig as Config>::Hasher::hash(
-                    &subxt_account_info
-                )),
+                hash: Some(hasher.hash(&subxt_account_info)),
                 closest_descendant_merkle_value: None,
                 child_trie_key: None
             }

testing/integration-tests/src/full_client/client/chain_head_rpcs.rs

@@ -15,7 +15,6 @@ use futures::Stream;
 use subxt::{
     config::Hasher,
     utils::{AccountId32, MultiAddress},
-    SubstrateConfig,
 };
 use subxt_rpcs::methods::chain_head::{
     FollowEvent, Initialized, MethodResponse, RuntimeEvent, RuntimeVersionEvent, StorageQuery,
@@ -329,6 +328,7 @@ async fn transaction_v1_broadcast() {
 
     let ctx = test_context().await;
     let api = ctx.client();
+    let hasher = api.hasher();
     let rpc = ctx.chainhead_rpc_methods().await;
 
     let tx_payload = node_runtime::tx()
@@ -374,7 +374,7 @@ async fn transaction_v1_broadcast() {
 
         let Some(ext) = block_extrinsics
             .iter()
-            .find(|ext| <SubstrateConfig as subxt::Config>::Hasher::hash(ext.bytes()) == tx_hash)
+            .find(|ext| hasher.hash(ext.bytes()) == tx_hash)
         else {
             continue;
         };

testing/integration-tests/src/full_client/frame/contracts.rs

@@ -12,7 +12,12 @@ use crate::{
     subxt_test, test_context, TestClient, TestConfig, TestContext,
 };
 use subxt::ext::futures::StreamExt;
-use subxt::{tx::TxProgress, utils::MultiAddress, Config, Error};
+use subxt::{
+    config::{Config, HashFor},
+    tx::TxProgress,
+    utils::MultiAddress,
+    Error,
+};
 use subxt_signer::sr25519::{self, dev};
 
 struct ContractsTestContext {
@@ -20,7 +25,7 @@ struct ContractsTestContext {
     signer: sr25519::Keypair,
 }
 
-type Hash = <TestConfig as Config>::Hash;
+type Hash = HashFor<TestConfig>;
 type AccountId = <TestConfig as Config>::AccountId;
 
 /// A dummy contract which does nothing at all.