lib.rs

// This file is part of Substrate.

// Copyright (C) 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.

//! # Remote Externalities
//!
//! An equivalent of `sp_io::TestExternalities` that can load its state from a remote substrate
//! based chain, or a local state snapshot file.

use async_recursion::async_recursion;
use codec::{Decode, Encode};
use indicatif::{ProgressBar, ProgressStyle};
use jsonrpsee::{
	core::params::ArrayParams,
	http_client::{HttpClient, HttpClientBuilder},
};
use log::*;
use serde::de::DeserializeOwned;
use sp_core::{
	hashing::twox_128,
	hexdisplay::HexDisplay,
	storage::{
		well_known_keys::{is_default_child_storage_key, DEFAULT_CHILD_STORAGE_KEY_PREFIX},
		ChildInfo, ChildType, PrefixedStorageKey, StorageData, StorageKey,
	},
	H256,
};
pub use sp_io::TestExternalities;
use sp_runtime::{traits::Block as BlockT, StateVersion};
use spinners::{Spinner, Spinners};
use std::{
	cmp::max,
	fs,
	ops::{Deref, DerefMut},
	path::{Path, PathBuf},
	time::{Duration, Instant},
};
use substrate_rpc_client::{rpc_params, BatchRequestBuilder, ChainApi, ClientT, StateApi};

type KeyValue = (StorageKey, StorageData);
type TopKeyValues = Vec<KeyValue>;
type ChildKeyValues = Vec<(ChildInfo, Vec<KeyValue>)>;

const LOG_TARGET: &str = "remote-ext";
const DEFAULT_HTTP_ENDPOINT: &str = "https://rpc.polkadot.io:443";
/// The snapshot that we store on disk.
#[derive(Decode, Encode)]
struct Snapshot<B: BlockT> {
	state_version: StateVersion,
	block_hash: B::Hash,
	raw_storage: Vec<(H256, Vec<u8>)>,
	storage_root: H256,
}

/// An externalities that acts exactly the same as [`sp_io::TestExternalities`] but has a few extra
/// bits and pieces to it, and can be loaded remotely.
pub struct RemoteExternalities<B: BlockT> {
	/// The inner externalities.
	pub inner_ext: TestExternalities,
	/// The block hash it which we created this externality env.
	pub block_hash: B::Hash,
}

impl<B: BlockT> Deref for RemoteExternalities<B> {
	type Target = TestExternalities;
	fn deref(&self) -> &Self::Target {
		&self.inner_ext
	}
}

impl<B: BlockT> DerefMut for RemoteExternalities<B> {
	fn deref_mut(&mut self) -> &mut Self::Target {
		&mut self.inner_ext
	}
}

/// The execution mode.
#[derive(Clone)]
pub enum Mode<B: BlockT> {
	/// Online. Potentially writes to a snapshot file.
	Online(OnlineConfig<B>),
	/// Offline. Uses a state snapshot file and needs not any client config.
	Offline(OfflineConfig),
	/// Prefer using a snapshot file if it exists, else use a remote server.
	OfflineOrElseOnline(OfflineConfig, OnlineConfig<B>),
}

impl<B: BlockT> Default for Mode<B> {
	fn default() -> Self {
		Mode::Online(OnlineConfig::default())
	}
}

/// Configuration of the offline execution.
///
/// A state snapshot config must be present.
#[derive(Clone)]
pub struct OfflineConfig {
	/// The configuration of the state snapshot file to use. It must be present.
	pub state_snapshot: SnapshotConfig,
}

/// Description of the transport protocol (for online execution).
#[derive(Debug, Clone)]
pub enum Transport {
	/// Use the `URI` to open a new WebSocket connection.
	Uri(String),
	/// Use HTTP connection.
	RemoteClient(HttpClient),
}

impl Transport {
	fn as_client(&self) -> Option<&HttpClient> {
		match self {
			Self::RemoteClient(client) => Some(client),
			_ => None,
		}
	}

	// Build an HttpClient from a URI.
	async fn init(&mut self) -> Result<(), &'static str> {
		if let Self::Uri(uri) = self {
			log::debug!(target: LOG_TARGET, "initializing remote client to {:?}", uri);

			// If we have a ws uri, try to convert it to an http uri.
			// We use an HTTP client rather than WS because WS starts to choke with "accumulated
			// message length exceeds maximum" errors after processing ~10k keys when fetching
			// from a node running a default configuration.
			let uri = if uri.starts_with("ws://") {
				let uri = uri.replace("ws://", "http://");
				log::info!(target: LOG_TARGET, "replacing ws:// in uri with http://: {:?} (ws is currently unstable for fetching remote storage, for more see https://github.com/paritytech/jsonrpsee/issues/1086)", uri);
				uri
			} else if uri.starts_with("wss://") {
				let uri = uri.replace("wss://", "https://");
				log::info!(target: LOG_TARGET, "replacing wss:// in uri with https://: {:?} (ws is currently unstable for fetching remote storage, for more see https://github.com/paritytech/jsonrpsee/issues/1086)", uri);
				uri
			} else {
				uri.clone()
			};
			let http_client = HttpClientBuilder::default()
				.max_request_body_size(u32::MAX)
				.request_timeout(std::time::Duration::from_secs(60 * 5))
				.build(uri)
				.map_err(|e| {
					log::error!(target: LOG_TARGET, "error: {:?}", e);
					"failed to build http client"
				})?;

			*self = Self::RemoteClient(http_client)
		}

		Ok(())
	}
}

impl From<String> for Transport {
	fn from(uri: String) -> Self {
		Transport::Uri(uri)
	}
}

impl From<HttpClient> for Transport {
	fn from(client: HttpClient) -> Self {
		Transport::RemoteClient(client)
	}
}

/// Configuration of the online execution.
///
/// A state snapshot config may be present and will be written to in that case.
#[derive(Clone)]
pub struct OnlineConfig<B: BlockT> {
	/// The block hash at which to get the runtime state. Will be latest finalized head if not
	/// provided.
	pub at: Option<B::Hash>,
	/// An optional state snapshot file to WRITE to, not for reading. Not written if set to `None`.
	pub state_snapshot: Option<SnapshotConfig>,
	/// The pallets to scrape. These values are hashed and added to `hashed_prefix`.
	pub pallets: Vec<String>,
	/// Transport config.
	pub transport: Transport,
	/// Lookout for child-keys, and scrape them as well if set to true.
	pub child_trie: bool,
	/// Storage entry key prefixes to be injected into the externalities. The *hashed* prefix must
	/// be given.
	pub hashed_prefixes: Vec<Vec<u8>>,
	/// Storage entry keys to be injected into the externalities. The *hashed* key must be given.