mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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light-client: Add experimental light-client support (#965)
* rpc/types: Decode `SubstrateTxStatus` for substrate and smoldot Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * lightclient: Add light client Error Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * lightclient: Add background task to manage RPC responses Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * lightclient: Implement the light client RPC in subxt Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * subxt: Expose light client under experimental feature-flag Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * artifacts: Add development chain spec for local nodes Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Update cargo lock Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * examples: Add light client example Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Update sp-* crates and smoldot to use git with branch / rev Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Apply cargo fmt Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Fix clippy Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Import hashmap entry Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * lightclient: Fetch spec only if jsonrpsee feature is enabled Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Update subxt/src/rpc/lightclient/background.rs Co-authored-by: Niklas Adolfsson <niklasadolfsson1@gmail.com> * Fix typo Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * artifacts: Update dev chain spec Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * types: Handle storage replies from chainHead_storage Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * artifacts: Add polkadot spec Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * lightclient: Handle RPC error responses Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * examples: Tx basic with light client for local nodes Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * example: Light client coprehensive example for live chains Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * examples: Remove prior light client example Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * feature: Rename experimental to unstable Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * book: Add light client section Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * testing: Fix clippy Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * lightclient: Ignore validated events Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust tests for light-clients and normal clients Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * testing: Keep lightclient variant Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Remove support for chainHead_storage for light client Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Update light client to point to crates.io Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Update sp-crates from crates.io Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Replace Atomic with u64 Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Add LightClientBuilder Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust chainspec with provided bootnodes Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Add potential_relay_chains to light client builder Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Move the light-client to the background task Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust tracing logs Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Update book and example Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Apply cargo fmt Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Remove dev_spec.json artifact Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Examples fix duplicate Cargo.toml Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Use tracing_subscriber crate Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Fix clippy for different features Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Add comment about bootNodes Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Add comment about tracing-sub dependency Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Run integration-tests with light-client Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Feature guard some incompatible tests Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * ci: Enable light-client tests under feature flag Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * ci: Fix git step name Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust flags for testing Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust warnings Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Rename feature flag jsonrpsee-ws to jsonrpsee Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Fix cargo check Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * ci: Run tests on just 2 threads Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Move light-client to subxt/src/client Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust LightClientBuilder Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Use ws_url to construct light client for testing Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Refactor background Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Address feedback Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Remove polkadot.spec and trim sub_id Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Wait for substrate to produce block before connecting light client Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust builder and tests Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Apply fmt Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * ci: Use release for light client testing Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Add single test for light-client Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Wait for more blocks Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Use polkadot endpoint for testing Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust cargo check Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * examples: Remove light client chain connection example Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust cargo.toml section for the old example Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust background task to use usize for subscription Id Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Build bootnodes with serde_json::Value directly Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Make channel between subxt user and subxt background unbounded Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Update subxt/src/client/lightclient/builder.rs Co-authored-by: Niklas Adolfsson <niklasadolfsson1@gmail.com> * Switch to smoldot 0.6.0 from 0.5.0 Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Move testing to `full_client` and `light_client` higher modules Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Remove subscriptionID type Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Remove subxt/integration-testing feature flag Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust wait_for_blocks documentation Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Adjust utils import for testing Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> * Remove into_iter from builder construction Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> --------- Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> Co-authored-by: Niklas Adolfsson <niklasadolfsson1@gmail.com>
This commit is contained in:
Alexandru Vasile
@@ -0,0 +1,48 @@
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// Copyright 2019-2023 Parity Technologies (UK) Ltd.
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// This file is dual-licensed as Apache-2.0 or GPL-3.0.
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// see LICENSE for license details.
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//! # Light Client
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//!
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//! The Light Client aims to contribute to the decentralization of blockchains by providing connectivity
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//! to the P2P network and behaving similarly to a full node.
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//!
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//! To enable this functionality, the unstable-light-client feature flag needs to be enabled.
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//!
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//! To connect to a blockchain network, the Light Client requires a trusted sync state of the network, named "chain spec".
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//! This can be obtained by making a `sync_state_genSyncSpec` RPC call to a trusted node.
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//!
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//! The following is an example of fetching the chain spec from a local running onde on port 9933.
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//!
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//! ```bash
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//! curl -H "Content-Type: application/json" -d '{"id":1, "jsonrpc":"2.0", "method": "sync_state_genSyncSpec", "params":[true]}' http://localhost:9933/ | jq .result > chain_spec.json
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//! ```
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//!
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//! ## Example
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//!
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//! You can construct a Light Client from a trusted chain spec stored on disk.
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//! Similary, the Light Client can fetch the chain spec from a running node and
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//! overwrite the bootNodes section. The `jsonrpsee` feature flag exposes the
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//! `build_from_url` method.
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//!
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//! ```rust,ignore
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//! let light_client = LightClientBuilder::new()
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//! .bootnodes(
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//! ["/ip4/127.0.0.1/tcp/30333/p2p/12D3KooWEyoppNCUx8Yx66oV9fJnriXwCcXwDDUA2kj6vnc6iDEp"]
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//! )
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//! .build_from_url("ws://127.0.0.1:9944")
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//! .await?;
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//! ```
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//!
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//! Here's an example which connects to a local chain and submits a transaction.
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//!
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//! You can run the example using the following command:
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//!
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//! ```bash
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//! cargo run --example unstable_light_client_tx_basic --features="unstable-light-client jsonrpsee"
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//! ```
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//!
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//! ```rust,ignore
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#![doc = include_str!("../../../examples/unstable_light_client_tx_basic.rs")]
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//! ```
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//!
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@@ -10,12 +10,14 @@
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//! - [Constants](constants)
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//! - [Blocks](blocks)
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//! - [Runtime APIs](runtime_apis)
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//! - [Unstable Light Client](light_client)
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//!
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//! Alternately, [go back](super).
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pub mod blocks;
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pub mod constants;
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pub mod events;
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pub mod light_client;
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pub mod runtime_apis;
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pub mod storage;
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pub mod transactions;
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@@ -0,0 +1,436 @@
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// Copyright 2019-2023 Parity Technologies (UK) Ltd.
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// This file is dual-licensed as Apache-2.0 or GPL-3.0.
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// see LICENSE for license details.
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use futures::stream::StreamExt;
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use futures_util::future::{self, Either};
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use serde::Deserialize;
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use serde_json::value::RawValue;
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use std::{collections::HashMap, str::FromStr, sync::Arc};
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use tokio::sync::{mpsc, oneshot};
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use super::LightClientError;
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use smoldot_light::{platform::default::DefaultPlatform as Platform, ChainId};
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const LOG_TARGET: &str = "light-client-background";
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/// The response of an RPC method.
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pub type MethodResponse = Result<Box<RawValue>, LightClientError>;
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/// Message protocol between the front-end client that submits the RPC requests
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/// and the backend handler that produces responses from the chain.
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///
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/// The light client uses a single object [`smoldot_light::JsonRpcResponses`] to
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/// handle all requests and subscriptions from a chain. A background task is spawned
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/// to multiplex the rpc responses and to provide them back to their rightful submitters.
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#[derive(Debug)]
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pub enum FromSubxt {
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/// The RPC method request.
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Request {
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/// The method of the request.
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method: String,
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/// The parameters of the request.
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params: String,
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/// Channel used to send back the result.
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sender: oneshot::Sender<MethodResponse>,
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},
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/// The RPC subscription (pub/sub) request.
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Subscription {
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/// The method of the request.
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method: String,
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/// The parameters of the request.
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params: String,
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/// Channel used to send back the subscription ID if successful.
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sub_id: oneshot::Sender<MethodResponse>,
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/// Channel used to send back the notifcations.
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sender: mpsc::UnboundedSender<Box<RawValue>>,
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},
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}
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/// Background task data.
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pub struct BackgroundTask {
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/// Smoldot light client implementation that leverages the exposed platform.
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client: smoldot_light::Client<Arc<Platform>>,
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/// The ID of the chain used to identify the chain protocol (ie. substrate).
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///
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/// Note: A single chain is supported for a client. This aligns with the subxt's
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/// vision of the Client.
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chain_id: ChainId,
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/// Unique ID for RPC calls.
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request_id: usize,
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/// Map the request ID of a RPC method to the frontend `Sender`.
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requests: HashMap<usize, oneshot::Sender<MethodResponse>>,
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/// Subscription calls first need to make a plain RPC method
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/// request to obtain the subscription ID.
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///
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/// The RPC method request is made in the background and the response should
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/// not be sent back to the user.
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/// Map the request ID of a RPC method to the frontend `Sender`.
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id_to_subscription: HashMap<
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usize,
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(
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oneshot::Sender<MethodResponse>,
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mpsc::UnboundedSender<Box<RawValue>>,
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),
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>,
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/// Map the subscription ID to the frontend `Sender`.
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subscriptions: HashMap<usize, mpsc::UnboundedSender<Box<RawValue>>>,
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}
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impl BackgroundTask {
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/// Constructs a new [`BackgroundTask`].
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pub fn new(client: smoldot_light::Client<Arc<Platform>>, chain_id: ChainId) -> BackgroundTask {
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BackgroundTask {
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client,
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chain_id,
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request_id: 1,
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requests: Default::default(),
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id_to_subscription: Default::default(),
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subscriptions: Default::default(),
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}
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}
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/// Fetch and increment the request ID.
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fn next_id(&mut self) -> usize {
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let next = self.request_id;
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self.request_id = self.request_id.wrapping_add(1);
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next
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}
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/// Handle the registration messages received from the user.
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async fn handle_requests(&mut self, message: FromSubxt) {
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match message {
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FromSubxt::Request {
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method,
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params,
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sender,
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} => {
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let id = self.next_id();
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let request = format!(
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r#"{{"jsonrpc":"2.0","id":"{}", "method":"{}","params":{}}}"#,
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id, method, params
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);
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self.requests.insert(id, sender);
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let result = self.client.json_rpc_request(request, self.chain_id);
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if let Err(err) = result {
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tracing::warn!(
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target: LOG_TARGET,
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"Cannot send RPC request to lightclient {:?}",
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err.to_string()
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);
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let sender = self
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.requests
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.remove(&id)
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.expect("Channel is inserted above; qed");
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// Send the error back to frontend.
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if sender
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.send(Err(LightClientError::Request(err.to_string())))
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.is_err()
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{
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tracing::warn!(
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target: LOG_TARGET,
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"Cannot send RPC request error to id={id}",
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);
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}
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}
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}
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FromSubxt::Subscription {
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method,
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params,
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sub_id,
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sender,
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} => {
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// For subscriptions we need to make a plain RPC request to the subscription method.
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// The server will return as a result the subscription ID.
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let id = self.next_id();
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let request = format!(
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r#"{{"jsonrpc":"2.0","id":"{}", "method":"{}","params":{}}}"#,
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id, method, params
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);
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self.id_to_subscription.insert(id, (sub_id, sender));
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let result = self.client.json_rpc_request(request, self.chain_id);
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if let Err(err) = result {
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tracing::warn!(
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target: LOG_TARGET,
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"Cannot send RPC request to lightclient {:?}",
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err.to_string()
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);
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let (sub_id, _) = self
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.id_to_subscription
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.remove(&id)
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.expect("Channels are inserted above; qed");
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// Send the error back to frontend.
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if sub_id
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.send(Err(LightClientError::Request(err.to_string())))
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.is_err()
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{
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tracing::warn!(
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target: LOG_TARGET,
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"Cannot send RPC request error to id={id}",
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);
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}
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}
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}
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};
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}
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/// Parse the response received from the light client and sent it to the appropriate user.
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fn handle_rpc_response(&mut self, response: String) {
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match RpcResponse::from_str(&response) {
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Ok(RpcResponse::Error { id, error }) => {
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let Ok(id) = id.parse::<usize>() else {
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tracing::warn!(target: LOG_TARGET, "Cannot send error. Id={id} is not a valid number");
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return
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};
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if let Some(sender) = self.requests.remove(&id) {
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if sender
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.send(Err(LightClientError::Request(error.to_string())))
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.is_err()
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{
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tracing::warn!(
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target: LOG_TARGET,
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"Cannot send method response to id={id}",
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);
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}
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} else if let Some((sub_id_sender, _)) = self.id_to_subscription.remove(&id) {
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if sub_id_sender
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.send(Err(LightClientError::Request(error.to_string())))
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.is_err()
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{
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tracing::warn!(
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target: LOG_TARGET,
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"Cannot send method response to id {:?}",
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id
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);
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}
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}
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}
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Ok(RpcResponse::Method { id, result }) => {
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let Ok(id) = id.parse::<usize>() else {
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tracing::warn!(target: LOG_TARGET, "Cannot send response. Id={id} is not a valid number");
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return
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};
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// Send the response back.
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if let Some(sender) = self.requests.remove(&id) {
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if sender.send(Ok(result)).is_err() {
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tracing::warn!(
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target: LOG_TARGET,
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"Cannot send method response to id={id}",
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);
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}
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} else if let Some((sub_id_sender, sender)) = self.id_to_subscription.remove(&id) {
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let Ok(sub_id) = result
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.get()
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.trim_start_matches('"')
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.trim_end_matches('"')
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.parse::<usize>() else {
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tracing::warn!(
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target: LOG_TARGET,
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"Subscription id={result} is not a valid number",
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);
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return;
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};
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tracing::trace!(target: LOG_TARGET, "Received subscription id={sub_id}");
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if sub_id_sender.send(Ok(result)).is_err() {
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tracing::warn!(
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target: LOG_TARGET,
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"Cannot send method response to id={id}",
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);
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} else {
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// Track this subscription ID if send is successful.
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self.subscriptions.insert(sub_id, sender);
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}
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}
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}
|
||||
Ok(RpcResponse::Subscription { method, id, result }) => {
|
||||
let Ok(id) = id.parse::<usize>() else {
|
||||
tracing::warn!(target: LOG_TARGET, "Cannot send subscription. Id={id} is not a valid number");
|
||||
return
|
||||
};
|
||||
|
||||
if let Some(sender) = self.subscriptions.get_mut(&id) {
|
||||
// Send the current notification response.
|
||||
if sender.send(result).is_err() {
|
||||
tracing::warn!(
|
||||
target: LOG_TARGET,
|
||||
"Cannot send notification to subscription id={id} method={method}",
|
||||
);
|
||||
|
||||
// Remove the sender if the subscription dropped the receiver.
|
||||
self.subscriptions.remove(&id);
|
||||
}
|
||||
}
|
||||
}
|
||||
Err(err) => {
|
||||
tracing::warn!(target: LOG_TARGET, "cannot decode RPC response {:?}", err);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Perform the main background task:
|
||||
/// - receiving requests from subxt RPC method / subscriptions
|
||||
/// - provides the results from the light client back to users.
|
||||
pub async fn start_task(
|
||||
&mut self,
|
||||
from_subxt: mpsc::UnboundedReceiver<FromSubxt>,
|
||||
from_node: smoldot_light::JsonRpcResponses,
|
||||
) {
|
||||
let from_subxt_event = tokio_stream::wrappers::UnboundedReceiverStream::new(from_subxt);
|
||||
let from_node_event = futures_util::stream::unfold(from_node, |mut from_node| async {
|
||||
from_node.next().await.map(|result| (result, from_node))
|
||||
});
|
||||
|
||||
tokio::pin!(from_subxt_event, from_node_event);
|
||||
|
||||
let mut from_subxt_event_fut = from_subxt_event.next();
|
||||
let mut from_node_event_fut = from_node_event.next();
|
||||
|
||||
loop {
|
||||
match future::select(from_subxt_event_fut, from_node_event_fut).await {
|
||||
// Message received from subxt.
|
||||
Either::Left((subxt_message, previous_fut)) => {
|
||||
let Some(message) = subxt_message else {
|
||||
tracing::trace!(target: LOG_TARGET, "Subxt channel closed");
|
||||
break;
|
||||
};
|
||||
tracing::trace!(
|
||||
target: LOG_TARGET,
|
||||
"Received register message {:?}",
|
||||
message
|
||||
);
|
||||
|
||||
self.handle_requests(message).await;
|
||||
|
||||
from_subxt_event_fut = from_subxt_event.next();
|
||||
from_node_event_fut = previous_fut;
|
||||
}
|
||||
// Message received from rpc handler: lightclient response.
|
||||
Either::Right((node_message, previous_fut)) => {
|
||||
// Smoldot returns `None` if the chain has been removed (which subxt does not remove).
|
||||
let Some(response) = node_message else {
|
||||
tracing::trace!(target: LOG_TARGET, "Smoldot RPC responses channel closed");
|
||||
break;
|
||||
};
|
||||
tracing::trace!(
|
||||
target: LOG_TARGET,
|
||||
"Received smoldot RPC result {:?}",
|
||||
response
|
||||
);
|
||||
|
||||
self.handle_rpc_response(response);
|
||||
|
||||
// Advance backend, save frontend.
|
||||
from_subxt_event_fut = previous_fut;
|
||||
from_node_event_fut = from_node_event.next();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
tracing::trace!(target: LOG_TARGET, "Task closed");
|
||||
}
|
||||
}
|
||||
|
||||
/// The RPC response from the light-client.
|
||||
/// This can either be a response of a method, or a notification from a subscription.
|
||||
#[derive(Debug, Clone)]
|
||||
enum RpcResponse {
|
||||
Method {
|
||||
/// Response ID.
|
||||
id: String,
|
||||
/// The result of the method call.
|
||||
result: Box<RawValue>,
|
||||
},
|
||||
Subscription {
|
||||
/// RPC method that generated the notification.
|
||||
method: String,
|
||||
/// Subscription ID.
|
||||
id: String,
|
||||
/// Result.
|
||||
result: Box<RawValue>,
|
||||
},
|
||||
Error {
|
||||
/// Response ID.
|
||||
id: String,
|
||||
/// Error.
|
||||
error: Box<RawValue>,
|
||||
},
|
||||
}
|
||||
|
||||
impl std::str::FromStr for RpcResponse {
|
||||
type Err = serde_json::Error;
|
||||
|
||||
fn from_str(response: &str) -> Result<Self, Self::Err> {
|
||||
// Helper structures to deserialize from raw RPC strings.
|
||||
#[derive(Deserialize, Debug)]
|
||||
struct Response {
|
||||
/// JSON-RPC version.
|
||||
#[allow(unused)]
|
||||
jsonrpc: String,
|
||||
/// Result.
|
||||
result: Box<RawValue>,
|
||||
/// Request ID
|
||||
id: String,
|
||||
}
|
||||
#[derive(Deserialize)]
|
||||
struct NotificationParams {
|
||||
/// The ID of the subscription.
|
||||
subscription: String,
|
||||
/// Result.
|
||||
result: Box<RawValue>,
|
||||
}
|
||||
#[derive(Deserialize)]
|
||||
struct ResponseNotification {
|
||||
/// JSON-RPC version.
|
||||
#[allow(unused)]
|
||||
jsonrpc: String,
|
||||
/// RPC method that generated the notification.
|
||||
method: String,
|
||||
/// Result.
|
||||
params: NotificationParams,
|
||||
}
|
||||
#[derive(Deserialize)]
|
||||
struct ErrorResponse {
|
||||
/// JSON-RPC version.
|
||||
#[allow(unused)]
|
||||
jsonrpc: String,
|
||||
/// Request ID.
|
||||
id: String,
|
||||
/// Error.
|
||||
error: Box<RawValue>,
|
||||
}
|
||||
|
||||
// Check if the response can be mapped as an RPC method response.
|
||||
let result: Result<Response, _> = serde_json::from_str(response);
|
||||
if let Ok(response) = result {
|
||||
return Ok(RpcResponse::Method {
|
||||
id: response.id,
|
||||
result: response.result,
|
||||
});
|
||||
}
|
||||
|
||||
let result: Result<ResponseNotification, _> = serde_json::from_str(response);
|
||||
if let Ok(notification) = result {
|
||||
return Ok(RpcResponse::Subscription {
|
||||
id: notification.params.subscription,
|
||||
method: notification.method,
|
||||
result: notification.params.result,
|
||||
});
|
||||
}
|
||||
|
||||
let error: ErrorResponse = serde_json::from_str(response)?;
|
||||
Ok(RpcResponse::Error {
|
||||
id: error.id,
|
||||
error: error.error,
|
||||
})
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,191 @@
|
||||
// Copyright 2019-2023 Parity Technologies (UK) Ltd.
|
||||
// This file is dual-licensed as Apache-2.0 or GPL-3.0.
|
||||
// see LICENSE for license details.
|
||||
|
||||
use super::{rpc::LightClientRpc, LightClient, LightClientError};
|
||||
use crate::{config::Config, error::Error, OnlineClient};
|
||||
|
||||
#[cfg(feature = "jsonrpsee")]
|
||||
use jsonrpsee::{
|
||||
async_client::ClientBuilder,
|
||||
client_transport::ws::{Uri, WsTransportClientBuilder},
|
||||
core::client::ClientT,
|
||||
rpc_params,
|
||||
};
|
||||
use smoldot_light::ChainId;
|
||||
use std::num::NonZeroU32;
|
||||
use std::sync::Arc;
|
||||
|
||||
/// Builder for [`LightClient`].
|
||||
#[derive(Clone, Debug)]
|
||||
pub struct LightClientBuilder {
|
||||
max_pending_requests: NonZeroU32,
|
||||
max_subscriptions: u32,
|
||||
bootnodes: Option<Vec<serde_json::Value>>,
|
||||
potential_relay_chains: Option<Vec<ChainId>>,
|
||||
}
|
||||
|
||||
impl Default for LightClientBuilder {
|
||||
fn default() -> Self {
|
||||
Self {
|
||||
max_pending_requests: NonZeroU32::new(128)
|
||||
.expect("Valid number is greater than zero; qed"),
|
||||
max_subscriptions: 1024,
|
||||
bootnodes: None,
|
||||
potential_relay_chains: None,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl LightClientBuilder {
|
||||
/// Create a new [`LightClientBuilder`].
|
||||
pub fn new() -> LightClientBuilder {
|
||||
LightClientBuilder::default()
|
||||
}
|
||||
|
||||
/// Overwrite the bootnodes of the chain specification.
|
||||
///
|
||||
/// Can be used to provide trusted entities to the chain spec, or for
|
||||
/// testing environments.
|
||||
pub fn bootnodes<'a>(mut self, bootnodes: impl IntoIterator<Item = &'a str>) -> Self {
|
||||
self.bootnodes = Some(bootnodes.into_iter().map(Into::into).collect());
|
||||
self
|
||||
}
|
||||
|
||||
/// Maximum number of JSON-RPC in the queue of requests waiting to be processed.
|
||||
/// This parameter is necessary for situations where the JSON-RPC clients aren't
|
||||
/// trusted. If you control all the requests that are sent out and don't want them
|
||||
/// to fail, feel free to pass `u32::max_value()`.
|
||||
///
|
||||
/// Default is 128.
|
||||
pub fn max_pending_requests(mut self, max_pending_requests: NonZeroU32) -> Self {
|
||||
self.max_pending_requests = max_pending_requests;
|
||||
self
|
||||
}
|
||||
|
||||
/// Maximum number of active subscriptions before new ones are automatically
|
||||
/// rejected. Any JSON-RPC request that causes the server to generate notifications
|
||||
/// counts as a subscription.
|
||||
///
|
||||
/// Default is 1024.
|
||||
pub fn max_subscriptions(mut self, max_subscriptions: u32) -> Self {
|
||||
self.max_subscriptions = max_subscriptions;
|
||||
self
|
||||
}
|
||||
|
||||
/// If the chain spec defines a parachain, contains the list of relay chains to choose
|
||||
/// from. Ignored if not a parachain.
|
||||
///
|
||||
/// This field is necessary because multiple different chain can have the same identity.
|
||||
///
|
||||
/// For example: if user A adds a chain named "Kusama", then user B adds a different chain
|
||||
/// also named "Kusama", then user B adds a parachain whose relay chain is "Kusama", it would
|
||||
/// be wrong to connect to the "Kusama" created by user A.
|
||||
pub fn potential_relay_chains(
|
||||
mut self,
|
||||
potential_relay_chains: impl IntoIterator<Item = ChainId>,
|
||||
) -> Self {
|
||||
self.potential_relay_chains = Some(potential_relay_chains.into_iter().collect());
|
||||
self
|
||||
}
|
||||
|
||||
/// Build the light client with specified URL to connect to.
|
||||
/// You must provide the port number in the URL.
|
||||
///
|
||||
/// ## Panics
|
||||
///
|
||||
/// Panics if being called outside of `tokio` runtime context.
|
||||
#[cfg(feature = "jsonrpsee")]
|
||||
pub async fn build_from_url<T: Config, Url: AsRef<str>>(
|
||||
self,
|
||||
url: Url,
|
||||
) -> Result<LightClient<T>, Error> {
|
||||
let chain_spec = fetch_url(url.as_ref()).await?;
|
||||
|
||||
self.build_client(chain_spec).await
|
||||
}
|
||||
|
||||
/// Build the light client from chain spec.
|
||||
///
|
||||
/// The most important field of the configuration is the chain specification.
|
||||
/// This is a JSON document containing all the information necessary for the client to
|
||||
/// connect to said chain.
|
||||
///
|
||||
/// The chain spec must be obtained from a trusted entity.
|
||||
///
|
||||
/// It can be fetched from a trused node with the following command:
|
||||
/// ```bash
|
||||
/// curl -H "Content-Type: application/json" -d '{"id":1, "jsonrpc":"2.0", "method": "sync_state_genSyncSpec", "params":[true]}' http://localhost:9944/ | jq .result > res.spec
|
||||
/// ```
|
||||
///
|
||||
/// # Note
|
||||
///
|
||||
/// For testing environments, please populate the "bootNodes" if the not already provided.
|
||||
/// See [`Self::bootnodes`] for more details.
|
||||
///
|
||||
/// ## Panics
|
||||
///
|
||||
/// Panics if being called outside of `tokio` runtime context.
|
||||
pub async fn build<T: Config>(self, chain_spec: &str) -> Result<LightClient<T>, Error> {
|
||||
let chain_spec = serde_json::from_str(chain_spec)
|
||||
.map_err(|_| Error::LightClient(LightClientError::InvalidChainSpec))?;
|
||||
|
||||
self.build_client(chain_spec).await
|
||||
}
|
||||
|
||||
/// Build the light client.
|
||||
async fn build_client<T: Config>(
|
||||
self,
|
||||
mut chain_spec: serde_json::Value,
|
||||
) -> Result<LightClient<T>, Error> {
|
||||
// Set custom bootnodes if provided.
|
||||
if let Some(bootnodes) = self.bootnodes {
|
||||
if let serde_json::Value::Object(map) = &mut chain_spec {
|
||||
map.insert("bootNodes".to_string(), serde_json::Value::Array(bootnodes));
|
||||
}
|
||||
}
|
||||
|
||||
let config = smoldot_light::AddChainConfig {
|
||||
specification: &chain_spec.to_string(),
|
||||
json_rpc: smoldot_light::AddChainConfigJsonRpc::Enabled {
|
||||
max_pending_requests: self.max_pending_requests,
|
||||
max_subscriptions: self.max_subscriptions,
|
||||
},
|
||||
potential_relay_chains: self.potential_relay_chains.unwrap_or_default().into_iter(),
|
||||
database_content: "",
|
||||
user_data: (),
|
||||
};
|
||||
|
||||
let rpc = LightClientRpc::new(config)?;
|
||||
let online_client = OnlineClient::<T>::from_rpc_client(Arc::new(rpc)).await?;
|
||||
Ok(LightClient(online_client))
|
||||
}
|
||||
}
|
||||
|
||||
/// Fetch the chain spec from the URL.
|
||||
#[cfg(feature = "jsonrpsee")]
|
||||
async fn fetch_url(url: impl AsRef<str>) -> Result<serde_json::Value, Error> {
|
||||
let url = url
|
||||
.as_ref()
|
||||
.parse::<Uri>()
|
||||
.map_err(|_| Error::LightClient(LightClientError::InvalidUrl))?;
|
||||
|
||||
if url.scheme_str() != Some("ws") && url.scheme_str() != Some("wss") {
|
||||
return Err(Error::LightClient(LightClientError::InvalidScheme));
|
||||
}
|
||||
|
||||
let (sender, receiver) = WsTransportClientBuilder::default()
|
||||
.build(url)
|
||||
.await
|
||||
.map_err(|_| LightClientError::Handshake)?;
|
||||
|
||||
let client = ClientBuilder::default()
|
||||
.request_timeout(core::time::Duration::from_secs(180))
|
||||
.max_notifs_per_subscription(4096)
|
||||
.build_with_tokio(sender, receiver);
|
||||
|
||||
client
|
||||
.request("sync_state_genSyncSpec", rpc_params![true])
|
||||
.await
|
||||
.map_err(|err| Error::Rpc(crate::error::RpcError::ClientError(Box::new(err))))
|
||||
}
|
||||
@@ -0,0 +1,75 @@
|
||||
// Copyright 2019-2023 Parity Technologies (UK) Ltd.
|
||||
// This file is dual-licensed as Apache-2.0 or GPL-3.0.
|
||||
// see LICENSE for license details.
|
||||
|
||||
//! This module provides support for light clients.
|
||||
|
||||
mod background;
|
||||
mod builder;
|
||||
mod rpc;
|
||||
|
||||
use derivative::Derivative;
|
||||
|
||||
use crate::{
|
||||
client::{OfflineClientT, OnlineClientT},
|
||||
config::Config,
|
||||
OnlineClient,
|
||||
};
|
||||
|
||||
pub use builder::LightClientBuilder;
|
||||
|
||||
/// Light client error.
|
||||
#[derive(Debug, thiserror::Error)]
|
||||
pub enum LightClientError {
|
||||
/// Error encountered while adding the chain to the light-client.
|
||||
#[error("Failed to add the chain to the light client: {0}.")]
|
||||
AddChainError(String),
|
||||
/// The background task is closed.
|
||||
#[error("Failed to communicate with the background task.")]
|
||||
BackgroundClosed,
|
||||
/// Invalid RPC parameters cannot be serialized as JSON string.
|
||||
#[error("RPC parameters cannot be serialized as JSON string.")]
|
||||
InvalidParams,
|
||||
/// Error originated while trying to submit a RPC request.
|
||||
#[error("RPC request cannot be sent: {0}.")]
|
||||
Request(String),
|
||||
/// The provided URL scheme is invalid.
|
||||
///
|
||||
/// Supported versions: WS, WSS.
|
||||
#[error("The provided URL scheme is invalid.")]
|
||||
InvalidScheme,
|
||||
/// The provided URL is invalid.
|
||||
#[error("The provided URL scheme is invalid.")]
|
||||
InvalidUrl,
|
||||
/// The provided chain spec is invalid.
|
||||
#[error("The provided chain spec is not a valid JSON object.")]
|
||||
InvalidChainSpec,
|
||||
/// Handshake error while connecting to a node.
|
||||
#[error("WS handshake failed.")]
|
||||
Handshake,
|
||||
}
|
||||
|
||||
/// The light-client RPC implementation that is used to connect with the chain.
|
||||
#[derive(Derivative)]
|
||||
#[derivative(Clone(bound = ""))]
|
||||
pub struct LightClient<T: Config>(OnlineClient<T>);
|
||||
|
||||
impl<T: Config> OnlineClientT<T> for LightClient<T> {
|
||||
fn rpc(&self) -> &crate::rpc::Rpc<T> {
|
||||
self.0.rpc()
|
||||
}
|
||||
}
|
||||
|
||||
impl<T: Config> OfflineClientT<T> for LightClient<T> {
|
||||
fn metadata(&self) -> crate::Metadata {
|
||||
self.0.metadata()
|
||||
}
|
||||
|
||||
fn genesis_hash(&self) -> <T as Config>::Hash {
|
||||
self.0.genesis_hash()
|
||||
}
|
||||
|
||||
fn runtime_version(&self) -> crate::rpc::types::RuntimeVersion {
|
||||
self.0.runtime_version()
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,209 @@
|
||||
// Copyright 2019-2023 Parity Technologies (UK) Ltd.
|
||||
// This file is dual-licensed as Apache-2.0 or GPL-3.0.
|
||||
// see LICENSE for license details.
|
||||
|
||||
use super::{
|
||||
background::{BackgroundTask, FromSubxt, MethodResponse},
|
||||
LightClientError,
|
||||
};
|
||||
use crate::{
|
||||
error::{Error, RpcError},
|
||||
rpc::{RpcClientT, RpcFuture, RpcSubscription},
|
||||
};
|
||||
use futures::{stream::StreamExt, Stream};
|
||||
use serde_json::value::RawValue;
|
||||
use smoldot_light::{platform::default::DefaultPlatform as Platform, ChainId};
|
||||
use std::pin::Pin;
|
||||
use tokio::sync::{mpsc, mpsc::error::SendError, oneshot};
|
||||
use tokio_stream::wrappers::UnboundedReceiverStream;
|
||||
|
||||
pub const LOG_TARGET: &str = "light-client";
|
||||
|
||||
/// The light-client RPC implementation that is used to connect with the chain.
|
||||
#[derive(Clone)]
|
||||
pub struct LightClientRpc {
|
||||
/// Communicate with the backend task that multiplexes the responses
|
||||
/// back to the frontend.
|
||||
to_backend: mpsc::UnboundedSender<FromSubxt>,
|
||||
}
|
||||
|
||||
impl LightClientRpc {
|
||||
/// Constructs a new [`LightClientRpc`], providing the chain specification.
|
||||
///
|
||||
/// The chain specification can be downloaded from a trusted network via
|
||||
/// the `sync_state_genSyncSpec` RPC method. This parameter expects the
|
||||
/// chain spec in text format (ie not in hex-encoded scale-encoded as RPC methods
|
||||
/// will provide).
|
||||
///
|
||||
/// ## Panics
|
||||
///
|
||||
/// Panics if being called outside of `tokio` runtime context.
|
||||
pub fn new(
|
||||
config: smoldot_light::AddChainConfig<'_, (), impl Iterator<Item = ChainId>>,
|
||||
) -> Result<LightClientRpc, Error> {
|
||||
tracing::trace!(target: LOG_TARGET, "Create light client");
|
||||
|
||||
let mut client = smoldot_light::Client::new(Platform::new(
|
||||
env!("CARGO_PKG_NAME").into(),
|
||||
env!("CARGO_PKG_VERSION").into(),
|
||||
));
|
||||
|
||||
let smoldot_light::AddChainSuccess {
|
||||
chain_id,
|
||||
json_rpc_responses,
|
||||
} = client
|
||||
.add_chain(config)
|
||||
.map_err(|err| LightClientError::AddChainError(err.to_string()))?;
|
||||
|
||||
let (to_backend, backend) = mpsc::unbounded_channel();
|
||||
|
||||
// `json_rpc_responses` can only be `None` if we had passed `json_rpc: Disabled`.
|
||||
let rpc_responses = json_rpc_responses.expect("Light client RPC configured; qed");
|
||||
|
||||
tokio::spawn(async move {
|
||||
let mut task = BackgroundTask::new(client, chain_id);
|
||||
task.start_task(backend, rpc_responses).await;
|
||||
});
|
||||
|
||||
Ok(LightClientRpc { to_backend })
|
||||
}
|
||||
|
||||
/// Submits an RPC method request to the light-client.
|
||||
///
|
||||
/// This method sends a request to the light-client to execute an RPC method with the provided parameters.
|
||||
/// The parameters are parsed into a valid JSON object in the background.
|
||||
fn method_request(
|
||||
&self,
|
||||
method: String,
|
||||
params: String,
|
||||
) -> Result<oneshot::Receiver<MethodResponse>, SendError<FromSubxt>> {
|
||||
let (sender, receiver) = oneshot::channel();
|
||||
|
||||
self.to_backend.send(FromSubxt::Request {
|
||||
method,
|
||||
params,
|
||||
sender,
|
||||
})?;
|
||||
|
||||
Ok(receiver)
|
||||
}
|
||||
|
||||
/// Makes an RPC subscription call to the light-client.
|
||||
///
|
||||
/// This method sends a request to the light-client to establish an RPC subscription with the provided parameters.
|
||||
/// The parameters are parsed into a valid JSON object in the background.
|
||||
fn subscription_request(
|
||||
&self,
|
||||
method: String,
|
||||
params: String,
|
||||
) -> Result<
|
||||
(
|
||||
oneshot::Receiver<MethodResponse>,
|
||||
mpsc::UnboundedReceiver<Box<RawValue>>,
|
||||
),
|
||||
SendError<FromSubxt>,
|
||||
> {
|
||||
let (sub_id, sub_id_rx) = oneshot::channel();
|
||||
let (sender, receiver) = mpsc::unbounded_channel();
|
||||
|
||||
self.to_backend.send(FromSubxt::Subscription {
|
||||
method,
|
||||
params,
|
||||
sub_id,
|
||||
sender,
|
||||
})?;
|
||||
|
||||
Ok((sub_id_rx, receiver))
|
||||
}
|
||||
}
|
||||
|
||||
impl RpcClientT for LightClientRpc {
|
||||
fn request_raw<'a>(
|
||||
&'a self,
|
||||
method: &'a str,
|
||||
params: Option<Box<RawValue>>,
|
||||
) -> RpcFuture<'a, Box<RawValue>> {
|
||||
let client = self.clone();
|
||||
|
||||
Box::pin(async move {
|
||||
let params = match params {
|
||||
Some(params) => serde_json::to_string(¶ms).map_err(|_| {
|
||||
RpcError::ClientError(Box::new(LightClientError::InvalidParams))
|
||||
})?,
|
||||
None => "[]".into(),
|
||||
};
|
||||
|
||||
// Fails if the background is closed.
|
||||
let rx = client
|
||||
.method_request(method.to_string(), params)
|
||||
.map_err(|_| RpcError::ClientError(Box::new(LightClientError::BackgroundClosed)))?;
|
||||
|
||||
// Fails if the background is closed.
|
||||
let response = rx
|
||||
.await
|
||||
.map_err(|_| RpcError::ClientError(Box::new(LightClientError::BackgroundClosed)))?;
|
||||
|
||||
tracing::trace!(target: LOG_TARGET, "RPC response {:?}", response);
|
||||
|
||||
response.map_err(|err| RpcError::ClientError(Box::new(err)))
|
||||
})
|
||||
}
|
||||
|
||||
fn subscribe_raw<'a>(
|
||||
&'a self,
|
||||
sub: &'a str,
|
||||
params: Option<Box<RawValue>>,
|
||||
_unsub: &'a str,
|
||||
) -> RpcFuture<'a, RpcSubscription> {
|
||||
let client = self.clone();
|
||||
|
||||
Box::pin(async move {
|
||||
tracing::trace!(
|
||||
target: LOG_TARGET,
|
||||
"Subscribe to {:?} with params {:?}",
|
||||
sub,
|
||||
params
|
||||
);
|
||||
|
||||
let params = match params {
|
||||
Some(params) => serde_json::to_string(¶ms).map_err(|_| {
|
||||
RpcError::ClientError(Box::new(LightClientError::InvalidParams))
|
||||
})?,
|
||||
None => "[]".into(),
|
||||
};
|
||||
|
||||
// Fails if the background is closed.
|
||||
let (sub_id, notif) = client
|
||||
.subscription_request(sub.to_string(), params)
|
||||
.map_err(|_| RpcError::ClientError(Box::new(LightClientError::BackgroundClosed)))?;
|
||||
|
||||
// Fails if the background is closed.
|
||||
let result = sub_id
|
||||
.await
|
||||
.map_err(|_| RpcError::ClientError(Box::new(LightClientError::BackgroundClosed)))?
|
||||
.map_err(|err| {
|
||||
RpcError::ClientError(Box::new(LightClientError::Request(err.to_string())))
|
||||
})?;
|
||||
|
||||
let sub_id = result
|
||||
.get()
|
||||
.trim_start_matches('"')
|
||||
.trim_end_matches('"')
|
||||
.to_string();
|
||||
tracing::trace!(target: LOG_TARGET, "Received subscription ID: {}", sub_id);
|
||||
|
||||
let stream = UnboundedReceiverStream::new(notif);
|
||||
|
||||
let rpc_substription_stream: Pin<
|
||||
Box<dyn Stream<Item = Result<Box<RawValue>, RpcError>> + Send + 'static>,
|
||||
> = Box::pin(stream.map(Ok));
|
||||
|
||||
let rpc_subscription: RpcSubscription = RpcSubscription {
|
||||
stream: rpc_substription_stream,
|
||||
id: Some(sub_id),
|
||||
};
|
||||
|
||||
Ok(rpc_subscription)
|
||||
})
|
||||
}
|
||||
}
|
||||
@@ -11,6 +11,9 @@
|
||||
mod offline_client;
|
||||
mod online_client;
|
||||
|
||||
#[cfg(feature = "unstable-light-client")]
|
||||
mod lightclient;
|
||||
|
||||
pub use offline_client::{OfflineClient, OfflineClientT};
|
||||
pub use online_client::{
|
||||
ClientRuntimeUpdater, OnlineClient, OnlineClientT, RuntimeUpdaterStream, Update, UpgradeError,
|
||||
@@ -18,3 +21,6 @@ pub use online_client::{
|
||||
|
||||
#[cfg(feature = "jsonrpsee")]
|
||||
pub use online_client::default_rpc_client;
|
||||
|
||||
#[cfg(feature = "unstable-light-client")]
|
||||
pub use lightclient::{LightClient, LightClientBuilder, LightClientError};
|
||||
|
||||
@@ -8,6 +8,9 @@ mod dispatch_error;
|
||||
|
||||
use core::fmt::Debug;
|
||||
|
||||
#[cfg(feature = "unstable-light-client")]
|
||||
pub use crate::client::LightClientError;
|
||||
|
||||
// Re-export dispatch error types:
|
||||
pub use dispatch_error::{
|
||||
ArithmeticError, DispatchError, ModuleError, RawModuleError, TokenError, TransactionalError,
|
||||
@@ -64,6 +67,10 @@ pub enum Error {
|
||||
/// The bytes representing an error that we were unable to decode.
|
||||
#[error("An error occurred but it could not be decoded: {0:?}")]
|
||||
Unknown(Vec<u8>),
|
||||
/// Light client error.
|
||||
#[cfg(feature = "unstable-light-client")]
|
||||
#[error("An error occurred but it could not be decoded: {0:?}")]
|
||||
LightClient(#[from] LightClientError),
|
||||
/// Other error.
|
||||
#[error("Other error: {0}")]
|
||||
Other(String),
|
||||
|
||||
@@ -53,6 +53,11 @@ mod only_used_in_docs_or_tests {
|
||||
use tokio as _;
|
||||
}
|
||||
|
||||
// Suppress an unused dependency warning because tracing_subscriber is
|
||||
// only used in example code snippets at the time of writing.
|
||||
#[cfg(test)]
|
||||
use tracing_subscriber as _;
|
||||
|
||||
// Used to enable the js feature for wasm.
|
||||
#[cfg(feature = "web")]
|
||||
#[allow(unused_imports)]
|
||||
|
||||
@@ -239,6 +239,8 @@ pub type SystemProperties = serde_json::Map<String, serde_json::Value>;
|
||||
///
|
||||
/// This is copied from `sp-transaction-pool` to avoid a dependency on that crate. Therefore it
|
||||
/// must be kept compatible with that type from the target substrate version.
|
||||
///
|
||||
/// Substrate produces `camelCase` events, while smoldot produces `CamelCase` events.
|
||||
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
|
||||
#[serde(rename_all = "camelCase")]
|
||||
pub enum SubstrateTxStatus<Hash, BlockHash> {
|
||||
|
||||
Reference in New Issue
Block a user