Adds new execution strategy nativeElseWasm (#1546)

* fix: adds new execution strategy nativeElseWasm and replace nativeWhenPossible with it

* feat: adds cmd line params for execution strategies

* fix: uses of cmd line execution strategies

* chore: remove white spaces

* chore: remove println

* chore: remove whitespace

* fix: generating functions with context

* feat: add function to generate with_context declarations

* fix: add implementation for with_context function calls

* fix: add execution context to call_api_at function

* fix: making use of context to select strategy for block_builder

* chore: cleaning up

* fix: merging issues

* fix tests

* add wasm files

* chore: small doc for context fields

* chore: delete redundant docs

* fix: use full path for ExecutionContext

* fix: add context functions from inside fold_item_impl

* chore: remove clone

* fix: moving generative function to utils, remove unused imports

* fix: add missing full path for ExecutionContext

* fix: merge issues

* update wasm files

* fix: update to keep up with changes in master

* chore: remove unused functions, clean up

* fix test

* fix grumbles

* fix: add more tests

* fix: some refactorings

* feat: add execution strategy to call

* chore: small improvements

* fix: add message to panic

* fix tests

substrate/core/service/src/components.rs

@@ -437,8 +437,7 @@ impl<Factory: ServiceFactory> Components for FullComponents<Factory> {
 			db_settings,
 			executor,
 			&config.chain_spec,
-			config.block_execution_strategy,
-			config.api_execution_strategy,
+			config.execution_strategies.clone(),
 		)?), None))
 	}
 

substrate/core/service/src/config.rs

@@ -19,7 +19,7 @@
 use std::net::SocketAddr;
 use transaction_pool;
 use crate::chain_spec::ChainSpec;
-pub use client::ExecutionStrategy;
+pub use client::ExecutionStrategies;
 pub use client_db::PruningMode;
 pub use network::config::{NetworkConfiguration, Roles};
 use runtime_primitives::BuildStorage;
@@ -57,10 +57,8 @@ pub struct Configuration<C, G: Serialize + DeserializeOwned + BuildStorage> {
 	pub custom: C,
 	/// Node name.
 	pub name: String,
-	/// Block execution strategy.
-	pub block_execution_strategy: ExecutionStrategy,
-	/// Runtime API execution strategy.
-	pub api_execution_strategy: ExecutionStrategy,
+	/// Execution strategies.
+	pub execution_strategies: ExecutionStrategies,
 	/// RPC over HTTP binding address. `None` if disabled.
 	pub rpc_http: Option<SocketAddr>,
 	/// RPC over Websockets binding address. `None` if disabled.
@@ -89,8 +87,7 @@ impl<C: Default, G: Serialize + DeserializeOwned + BuildStorage> Configuration<C
 			keys: Default::default(),
 			custom: Default::default(),
 			pruning: PruningMode::default(),
-			block_execution_strategy: ExecutionStrategy::Both,
-			api_execution_strategy: ExecutionStrategy::Both,
+			execution_strategies: Default::default(),
 			rpc_http: None,
 			rpc_ws: None,
 			telemetry_url: None,

substrate/core/service/src/lib.rs

@@ -49,7 +49,7 @@ pub use chain_spec::{ChainSpec, Properties};
 pub use transaction_pool::txpool::{
 	self, Pool as TransactionPool, Options as TransactionPoolOptions, ChainApi, IntoPoolError
 };
-pub use client::{ExecutionStrategy, FinalityNotifications};
+pub use client::FinalityNotifications;
 
 pub use components::{ServiceFactory, FullBackend, FullExecutor, LightBackend,
 	LightExecutor, Components, PoolApi, ComponentClient,