rpc server: listen to ipv6 socket if available and `--experimental-…

…rpc-endpoint` CLI option (#4792)

Close #3488,
#4331

This changes/adds the following:

1. The default setting is that substrate starts a rpc server that
listens to localhost both Ipv4 and Ipv6 on the same port. Ipv6 is
allowed to fail because some platforms may not support it
2. A new RPC CLI option `--experimental-rpc-endpoint` which allow to
configure arbitrary listen addresses including the port, if this is
enabled no other interfaces are enabled.
3. If the local addr is not found for any of the sockets the server is
not started throws an error.
4. Remove the deny_unsafe from the RPC implementations instead this is
an extension to allow different polices for different interfaces/sockets
such one may enable unsafe on local interface and safe on only the
external interface.

So for instance in this PR it's now possible to start up three RPC
endpoints as follows:
```
$ polkadot --experimental-rpc-endpoint "listen-addr=127.0.0.1:9944,rpc-methods=unsafe" --experimental-rpc-endpoint "listen-addr=0.0.0.0:9945,rpc-methods=safe,rate-limit=100" --experimental-rpc-endpoint "listen-addr=[::1]:9944,optional=true"
```

#### Needs to be addressed

~1. Support binding to a random port if it's fails with the default
stuff for backward compatible reasons~
~2. How to sync that the rpc CLI params and that the rpc-listen-addr
align, hard to maintain...~
~3. Add similar warning prints for exposing unsafe methods on external
interfaces..~
~4. Inline todos + the hacky String conversion from rpc params.~

#### Cons with this PR

Manual strings parsing impl more error-prone than relying on clap....

//cc @jsdw @BulatSaif @PierreBesson @bkchr

---------

Co-authored-by: Sebastian Kunert <skunert49@gmail.com>

Cargo.toml

@@ -812,8 +812,8 @@ isahc = { version = "1.2" }
 itertools = { version = "0.11" }
 jobserver = { version = "0.1.26" }
 jsonpath_lib = { version = "0.3" }
-jsonrpsee = { version = "0.23.2" }
-jsonrpsee-core = { version = "0.23.2" }
+jsonrpsee = { version = "0.24.3" }
+jsonrpsee-core = { version = "0.24.3" }
 k256 = { version = "0.13.3", default-features = false }
 kitchensink-runtime = { path = "substrate/bin/node/runtime" }
 kvdb = { version = "0.13.0" }

cumulus/client/cli/src/lib.rs

@@ -21,13 +21,13 @@
 use std::{
 	fs,
 	io::{self, Write},
-	net::SocketAddr,
 	path::PathBuf,
 	sync::Arc,
 };
 
 use codec::Encode;
 use sc_chain_spec::ChainSpec;
+use sc_cli::RpcEndpoint;
 use sc_client_api::HeaderBackend;
 use sc_service::{
 	config::{PrometheusConfig, RpcBatchRequestConfig, TelemetryEndpoints},
@@ -423,7 +423,7 @@ impl sc_cli::CliConfiguration for NormalizedRunCmd {
 		self.base.rpc_cors(is_dev)
 	}
 
-	fn rpc_addr(&self, default_listen_port: u16) -> sc_cli::Result<Option<SocketAddr>> {
+	fn rpc_addr(&self, default_listen_port: u16) -> sc_cli::Result<Option<Vec<RpcEndpoint>>> {
 		self.base.rpc_addr(default_listen_port)
 	}
 

cumulus/polkadot-parachain/polkadot-parachain-lib/src/cli.rs

@@ -25,10 +25,10 @@ use clap::{Command, CommandFactory, FromArgMatches};
 use sc_chain_spec::ChainSpec;
 use sc_cli::{
 	CliConfiguration, DefaultConfigurationValues, ImportParams, KeystoreParams, NetworkParams,
-	SharedParams, SubstrateCli,
+	RpcEndpoint, SharedParams, SubstrateCli,
 };
 use sc_service::{config::PrometheusConfig, BasePath};
-use std::{fmt::Debug, marker::PhantomData, net::SocketAddr, path::PathBuf};
+use std::{fmt::Debug, marker::PhantomData, path::PathBuf};
 
 /// Trait that can be used to customize some of the customer-facing info related to the node binary
 /// that is being built using this library.
@@ -300,7 +300,7 @@ impl<Config: CliConfig> CliConfiguration<Self> for RelayChainCli<Config> {
 			.or_else(|| self.base_path.clone().map(Into::into)))
 	}
 
-	fn rpc_addr(&self, default_listen_port: u16) -> sc_cli::Result<Option<SocketAddr>> {
+	fn rpc_addr(&self, default_listen_port: u16) -> sc_cli::Result<Option<Vec<RpcEndpoint>>> {
 		self.base.base.rpc_addr(default_listen_port)
 	}
 

cumulus/polkadot-parachain/polkadot-parachain-lib/src/rpc.rs

@@ -24,10 +24,7 @@ use crate::{
 };
 use pallet_transaction_payment_rpc::{TransactionPayment, TransactionPaymentApiServer};
 use parachains_common::{AccountId, Balance, Block, Nonce};
-use sc_rpc::{
-	dev::{Dev, DevApiServer},
-	DenyUnsafe,
-};
+use sc_rpc::dev::{Dev, DevApiServer};
 use std::{marker::PhantomData, sync::Arc};
 use substrate_frame_rpc_system::{System, SystemApiServer};
 use substrate_state_trie_migration_rpc::{StateMigration, StateMigrationApiServer};
@@ -37,7 +34,6 @@ pub type RpcExtension = jsonrpsee::RpcModule<()>;
 
 pub(crate) trait BuildRpcExtensions<Client, Backend, Pool> {
 	fn build_rpc_extensions(
-		deny_unsafe: DenyUnsafe,
 		client: Arc<Client>,
 		backend: Arc<Backend>,
 		pool: Arc<Pool>,
@@ -56,7 +52,6 @@ where
 	RuntimeApi: ConstructNodeRuntimeApi<Block, ParachainClient<RuntimeApi>> + Send + Sync + 'static,
 {
 	fn build_rpc_extensions(
-		_deny_unsafe: DenyUnsafe,
 		_client: Arc<ParachainClient<RuntimeApi>>,
 		_backend: Arc<ParachainBackend>,
 		_pool: Arc<sc_transaction_pool::FullPool<Block, ParachainClient<RuntimeApi>>>,
@@ -79,18 +74,17 @@ where
 		+ substrate_frame_rpc_system::AccountNonceApi<Block, AccountId, Nonce>,
 {
 	fn build_rpc_extensions(
-		deny_unsafe: DenyUnsafe,
 		client: Arc<ParachainClient<RuntimeApi>>,
 		backend: Arc<ParachainBackend>,
 		pool: Arc<sc_transaction_pool::FullPool<Block, ParachainClient<RuntimeApi>>>,
 	) -> sc_service::error::Result<RpcExtension> {
 		let build = || -> Result<RpcExtension, Box<dyn std::error::Error + Send + Sync>> {
 			let mut module = RpcExtension::new(());
 
-			module.merge(System::new(client.clone(), pool, deny_unsafe).into_rpc())?;
+			module.merge(System::new(client.clone(), pool).into_rpc())?;
 			module.merge(TransactionPayment::new(client.clone()).into_rpc())?;
-			module.merge(StateMigration::new(client.clone(), backend, deny_unsafe).into_rpc())?;
-			module.merge(Dev::new(client, deny_unsafe).into_rpc())?;
+			module.merge(StateMigration::new(client.clone(), backend).into_rpc())?;
+			module.merge(Dev::new(client).into_rpc())?;
 
 			Ok(module)
 		};