joystream/node/src/node_rpc.rs

// This file is part of Substrate.

// Copyright (C) 2019-2020 Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! A collection of node-specific RPC methods.
//!
//! Since `substrate` core functionality makes no assumptions
//! about the modules used inside the runtime, so do
//! RPC methods defined in `sc-rpc` crate.
//! It means that `client/rpc` can't have any methods that
//! need some strong assumptions about the particular runtime.
//!
//! The RPCs available in this crate however can make some assumptions
//! about how the runtime is constructed and what FRAME pallets
//! are part of it. Therefore all node-runtime-specific RPCs can
//! be placed here or imported from corresponding FRAME RPC definitions.

#![warn(missing_docs)]

use std::sync::Arc;

use node_runtime::UncheckedExtrinsic;
use node_runtime::{opaque::Block, AccountId, Balance, BlockNumber, Hash, Index};
use sc_consensus_babe::{Config, Epoch};
use sc_consensus_babe_rpc::BabeRpcHandler;
use sc_consensus_epochs::SharedEpochChanges;
use sc_finality_grandpa::{SharedAuthoritySet, SharedVoterState};
use sc_finality_grandpa_rpc::GrandpaRpcHandler;
use sc_keystore::KeyStorePtr;
use sc_rpc_api::DenyUnsafe;
use sp_api::ProvideRuntimeApi;
use sp_block_builder::BlockBuilder;
use sp_blockchain::{Error as BlockChainError, HeaderBackend, HeaderMetadata};
use sp_consensus::SelectChain;
use sp_consensus_babe::BabeApi;
use sp_transaction_pool::TransactionPool;

/// Light client extra dependencies.
pub struct LightDeps<C, F, P> {
    /// The client instance to use.
    pub client: Arc<C>,
    /// Transaction pool instance.
    pub pool: Arc<P>,
    /// Remote access to the blockchain (async).
    pub remote_blockchain: Arc<dyn sc_client_api::light::RemoteBlockchain<Block>>,
    /// Fetcher instance.
    pub fetcher: Arc<F>,
}

/// Extra dependencies for BABE.
pub struct BabeDeps {
    /// BABE protocol config.
    pub babe_config: Config,
    /// BABE pending epoch changes.
    pub shared_epoch_changes: SharedEpochChanges<Block, Epoch>,
    /// The keystore that manages the keys of the node.
    pub keystore: KeyStorePtr,
}

/// Extra dependencies for GRANDPA
pub struct GrandpaDeps {
    /// Voting round info.
    pub shared_voter_state: SharedVoterState,
    /// Authority set info.
    pub shared_authority_set: SharedAuthoritySet<Hash, BlockNumber>,
}

/// Full client dependencies.
pub struct FullDeps<C, P, SC> {
    /// The client instance to use.
    pub client: Arc<C>,
    /// Transaction pool instance.
    pub pool: Arc<P>,
    /// The SelectChain Strategy
    pub select_chain: SC,
    /// Whether to deny unsafe calls
    pub deny_unsafe: DenyUnsafe,
    /// BABE specific dependencies.
    pub babe: BabeDeps,
    /// GRANDPA specific dependencies.
    pub grandpa: GrandpaDeps,
}

/// Instantiate all Full RPC extensions.
pub fn create_full<C, P, M, SC>(deps: FullDeps<C, P, SC>) -> jsonrpc_core::IoHandler<M>
where
    C: ProvideRuntimeApi<Block>,
    C: HeaderBackend<Block> + HeaderMetadata<Block, Error = BlockChainError> + 'static,
    C: Send + Sync + 'static,
    C::Api: substrate_frame_rpc_system::AccountNonceApi<Block, AccountId, Index>,
    C::Api: pallet_transaction_payment_rpc::TransactionPaymentRuntimeApi<
        Block,
        Balance,
        UncheckedExtrinsic,
    >,
    C::Api: BabeApi<Block>,
    C::Api: BlockBuilder<Block>,
    P: TransactionPool + 'static,
    M: jsonrpc_core::Metadata + Default,
    SC: SelectChain<Block> + 'static,
{
    use pallet_transaction_payment_rpc::{TransactionPayment, TransactionPaymentApi};
    use substrate_frame_rpc_system::{FullSystem, SystemApi};

    let mut io = jsonrpc_core::IoHandler::default();
    let FullDeps {
        client,
        pool,
        select_chain,
        deny_unsafe,
        babe,
        grandpa,
    } = deps;
    let BabeDeps {
        keystore,
        babe_config,
        shared_epoch_changes,
    } = babe;
    let GrandpaDeps {
        shared_voter_state,
        shared_authority_set,
    } = grandpa;

    io.extend_with(SystemApi::to_delegate(FullSystem::new(
        client.clone(),
        pool,
        deny_unsafe,
    )));
    // Making synchronous calls in light client freezes the browser currently,
    // more context: https://github.com/paritytech/substrate/pull/3480
    // These RPCs should use an asynchronous caller instead.
    io.extend_with(TransactionPaymentApi::to_delegate(TransactionPayment::new(
        client.clone(),
    )));
    io.extend_with(sc_consensus_babe_rpc::BabeApi::to_delegate(
        BabeRpcHandler::new(
            client,
            shared_epoch_changes,
            keystore,
            babe_config,
            select_chain,
            deny_unsafe,
        ),
    ));
    io.extend_with(sc_finality_grandpa_rpc::GrandpaApi::to_delegate(
        GrandpaRpcHandler::new(shared_authority_set, shared_voter_state),
    ));

    io
}

/// Instantiate all Light RPC extensions.
pub fn create_light<C, P, M, F>(deps: LightDeps<C, F, P>) -> jsonrpc_core::IoHandler<M>
where
    C: sp_blockchain::HeaderBackend<Block>,
    C: Send + Sync + 'static,
    F: sc_client_api::light::Fetcher<Block> + 'static,
    P: TransactionPool + 'static,
    M: jsonrpc_core::Metadata + Default,
{
    use substrate_frame_rpc_system::{LightSystem, SystemApi};

    let LightDeps {
        client,
        pool,
        remote_blockchain,
        fetcher,
    } = deps;
    let mut io = jsonrpc_core::IoHandler::default();
    io.extend_with(SystemApi::<Hash, AccountId, Index>::to_delegate(
        LightSystem::new(client, remote_blockchain, fetcher, pool),
    ));

    io
}