1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179

// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
// This file is part of Frontier.
//
// Copyright (c) 2021-2022 Parity Technologies (UK) Ltd.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

use std::sync::Arc;

use ethereum_types::H256;
use serde::Deserialize;
// Substrate
use sp_api::ProvideRuntimeApi;
use sp_blockchain::HeaderBackend;
use sp_runtime::traits::Block as BlockT;
// Frontier
use fp_rpc::EthereumRuntimeRPCApi;

use super::{utils::FrontierDbMessage, Column, FrontierDbCmd, Operation};

#[derive(Debug, Deserialize)]
#[serde(untagged)]
pub enum MappingValue<H> {
	SubstrateBlockHash(H),
}

#[derive(Clone, Copy, Debug)]
pub enum MappingKey {
	EthBlockOrTransactionHash(H256),
}

pub struct MappingDb<'a, C, B: BlockT> {
	cmd: &'a FrontierDbCmd,
	client: Arc<C>,
	backend: Arc<fc_db::kv::Backend<B>>,
}

impl<'a, C, B: BlockT> MappingDb<'a, C, B>
where
	C: ProvideRuntimeApi<B>,
	C::Api: EthereumRuntimeRPCApi<B>,
	C: HeaderBackend<B>,
{
	pub fn new(
		cmd: &'a FrontierDbCmd,
		client: Arc<C>,
		backend: Arc<fc_db::kv::Backend<B>>,
	) -> Self {
		Self {
			cmd,
			client,
			backend,
		}
	}

	pub fn query(
		&self,
		column: &Column,
		key: &MappingKey,
		value: &Option<MappingValue<B::Hash>>,
	) -> sc_cli::Result<()> {
		match self.cmd.operation {
			Operation::Create => match (key, value) {
				// Insert a mapping commitment using the state at the requested block.
				(
					MappingKey::EthBlockOrTransactionHash(ethereum_block_hash),
					Some(MappingValue::SubstrateBlockHash(substrate_block_hash)),
				) => {
					if self
						.backend
						.mapping()
						.block_hash(ethereum_block_hash)?
						.is_none()
					{
						let existing_transaction_hashes: Vec<H256> = if let Some(statuses) = self
							.client
							.runtime_api()
							.current_transaction_statuses(*substrate_block_hash)
							.map_err(|e| format!("{:?}", e))?
						{
							statuses
								.iter()
								.map(|t| t.transaction_hash)
								.collect::<Vec<H256>>()
						} else {
							vec![]
						};

						let commitment = fc_db::kv::MappingCommitment::<B> {
							block_hash: *substrate_block_hash,
							ethereum_block_hash: *ethereum_block_hash,
							ethereum_transaction_hashes: existing_transaction_hashes,
						};

						self.backend.mapping().write_hashes(commitment)?;
					} else {
						return Err(self.key_not_empty_error(key));
					}
				}
				_ => return Err(self.key_value_error(key, value)),
			},
			Operation::Read => match (column, key) {
				// Given ethereum block hash, get substrate block hash.
				(Column::Block, MappingKey::EthBlockOrTransactionHash(ethereum_block_hash)) => {
					let value = self.backend.mapping().block_hash(ethereum_block_hash)?;
					println!("{:?}", value);
				}
				// Given ethereum transaction hash, get transaction metadata.
				(
					Column::Transaction,
					MappingKey::EthBlockOrTransactionHash(ethereum_transaction_hash),
				) => {
					let value = self
						.backend
						.mapping()
						.transaction_metadata(ethereum_transaction_hash)?;
					println!("{:?}", value);
				}
				_ => return Err(self.key_column_error(key, value)),
			},
			Operation::Update => match (key, value) {
				// Update a mapping commitment using the state at the requested block.
				(
					MappingKey::EthBlockOrTransactionHash(ethereum_block_hash),
					Some(MappingValue::SubstrateBlockHash(substrate_block_hash)),
				) => {
					if self
						.backend
						.mapping()
						.block_hash(ethereum_block_hash)?
						.is_some()
					{
						let existing_transaction_hashes: Vec<H256> = if let Some(statuses) = self
							.client
							.runtime_api()
							.current_transaction_statuses(*substrate_block_hash)
							.map_err(|e| format!("{:?}", e))?
						{
							statuses
								.iter()
								.map(|t| t.transaction_hash)
								.collect::<Vec<H256>>()
						} else {
							vec![]
						};

						let commitment = fc_db::kv::MappingCommitment::<B> {
							block_hash: *substrate_block_hash,
							ethereum_block_hash: *ethereum_block_hash,
							ethereum_transaction_hashes: existing_transaction_hashes,
						};

						self.backend.mapping().write_hashes(commitment)?;
					}
				}
				_ => return Err(self.key_value_error(key, value)),
			},
			Operation::Delete => {
				return Err("Delete operation is not supported for non-static keys"
					.to_string()
					.into())
			}
		}
		Ok(())
	}
}

impl<'a, C, B: BlockT> FrontierDbMessage for MappingDb<'a, C, B> {}