WASM Local-blob override (#7317)

* Provide WASM overwrite functionality in LocalCallExecutor

- add a new module `wasm_overwrite.rs` in client
  - scrapes given folder for runtimes
- add two new CLI Options `wasm-overwrite` and `wasm_overwrite_path`

* formatting

* Make comment clearer

remove sc-runtime-test from dev-dependencies

* comments

* Update client/service/src/client/wasm_overwrite.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Update client/service/src/client/wasm_overwrite.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Fix spaces, remove call into backend for 'heap_pages' in 'try_replace'

* Error if path is not a directory, Comments,

Doc Comment for WasmOverwrite

* make WasmOverwrite Option<>

* Change to one CLI argument for overwrites

- move getting runtime version into LocalCallExecutor

* change unwrap() to expect()

* comment

* Remove `check_overwrites`

* Encapsulate checking for overwrites in LocalCallExecutor

* move duplicate code into function

* Update client/cli/src/params/import_params.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* comma

* Update client/service/src/client/wasm_overwrite.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Update client/service/src/client/wasm_overwrite.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* cache hash in WasmBlob

* Update client/service/src/client/wasm_overwrite.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Update client/service/src/client/client.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* move getting overwrite into its own function

* fix error when directory is not a directory

* Error on duplicate WASM runtimes

* better comment, grammar

* docs

* Revert StateBackend back to _

* Update client/service/src/client/wasm_overwrite.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Update client/service/src/client/wasm_overwrite.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Update client/service/src/client/call_executor.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Add two tests, fix doc comments

Add a test for the runtime_version method of WasmOverwrite
Add a test for check_overwrite method of LocalCallExecutor

* remove redundant `Return` from expect msg

* Update client/cli/src/params/import_params.rs

Co-authored-by: David <dvdplm@gmail.com>

* Update client/service/src/client/call_executor.rs

Co-authored-by: David <dvdplm@gmail.com>

* Update client/service/src/client/wasm_overwrite.rs

Co-authored-by: David <dvdplm@gmail.com>

* Update client/service/src/config.rs

Co-authored-by: David <dvdplm@gmail.com>

* Update client/service/src/client/wasm_overwrite.rs

Co-authored-by: David <dvdplm@gmail.com>

* Add Module Documentation, match on '.wasm' extension

* Add test for scraping WASM blob

* fix expect

* remove creating another block in LocalCallExecutor test

* remove unused import

* add tests for duplicates and scraping wasm

* make tests a bit nicer

* add test for ignoring non-.wasm files

* check error message in test

* Update client/service/src/client/wasm_overwrite.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* remove println

* Update client/service/src/client/wasm_overwrite.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* make tests prettier

* Update client/service/src/client/wasm_overwrite.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* comment for seemingly random client

* locally-built -> custom

* remove unused import

* fix comment

* rename all references to overwrite with override

* fix cli flag in module documentation

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: David <dvdplm@gmail.com>

substrate/client/cli/src/params/import_params.rs

@@ -25,6 +25,7 @@ use crate::params::DatabaseParams;
 use crate::params::PruningParams;
 use sc_client_api::execution_extensions::ExecutionStrategies;
 use structopt::StructOpt;
+use std::path::PathBuf;
 
 /// Parameters for block import.
 #[derive(Debug, StructOpt)]
@@ -55,6 +56,12 @@ pub struct ImportParams {
 	)]
 	pub wasm_method: WasmExecutionMethod,
 
+	/// Specify the path where local WASM runtimes are stored.
+	///
+	/// These runtimes will override on-chain runtimes when the version matches.
+	#[structopt(long, value_name = "PATH", parse(from_os_str))]
+	pub wasm_runtime_overrides: Option<PathBuf>,
+
 	#[allow(missing_docs)]
 	#[structopt(flatten)]
 	pub execution_strategies: ExecutionStrategiesParams,
@@ -103,6 +110,12 @@ impl ImportParams {
 		self.wasm_method.into()
 	}
 
+	/// Enable overriding on-chain WASM with locally-stored WASM
+	/// by specifying the path where local WASM is stored.
+	pub fn wasm_runtime_overrides(&self) -> Option<PathBuf> {
+		self.wasm_runtime_overrides.clone()
+	}
+
 	/// Get execution strategies for the parameters
 	pub fn execution_strategies(&self, is_dev: bool, is_validator: bool) -> ExecutionStrategies {
 		let exec = &self.execution_strategies;