referrerpolicy=no-referrer-when-downgrade
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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
// This file is part of Substrate.

// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0

// 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/>.

//! Configuration trait for a CLI based on substrate

use crate::{
	arg_enums::Database, error::Result, DatabaseParams, ImportParams, KeystoreParams,
	NetworkParams, NodeKeyParams, OffchainWorkerParams, PruningParams, RpcEndpoint, SharedParams,
	SubstrateCli,
};
use log::warn;
use names::{Generator, Name};
use sc_service::{
	config::{
		BasePath, Configuration, DatabaseSource, ExecutorConfiguration, IpNetwork, KeystoreConfig,
		NetworkConfiguration, NodeKeyConfig, OffchainWorkerConfig, PrometheusConfig, PruningMode,
		Role, RpcBatchRequestConfig, RpcConfiguration, RpcMethods, TelemetryEndpoints,
		TransactionPoolOptions, WasmExecutionMethod,
	},
	BlocksPruning, ChainSpec, TracingReceiver,
};
use sc_tracing::logging::LoggerBuilder;
use std::{num::NonZeroU32, path::PathBuf};

/// The maximum number of characters for a node name.
pub(crate) const NODE_NAME_MAX_LENGTH: usize = 64;

/// Default sub directory to store network config.
pub(crate) const DEFAULT_NETWORK_CONFIG_PATH: &str = "network";

/// The recommended open file descriptor limit to be configured for the process.
const RECOMMENDED_OPEN_FILE_DESCRIPTOR_LIMIT: u64 = 10_000;

/// The default port.
pub const RPC_DEFAULT_PORT: u16 = 9944;
/// The default max number of subscriptions per connection.
pub const RPC_DEFAULT_MAX_SUBS_PER_CONN: u32 = 1024;
/// The default max request size in MB.
pub const RPC_DEFAULT_MAX_REQUEST_SIZE_MB: u32 = 15;
/// The default max response size in MB.
pub const RPC_DEFAULT_MAX_RESPONSE_SIZE_MB: u32 = 15;
/// The default concurrent connection limit.
pub const RPC_DEFAULT_MAX_CONNECTIONS: u32 = 100;
/// The default number of messages the RPC server
/// is allowed to keep in memory per connection.
pub const RPC_DEFAULT_MESSAGE_CAPACITY_PER_CONN: u32 = 64;

/// Default configuration values used by Substrate
///
/// These values will be used by [`CliConfiguration`] to set
/// default values for e.g. the listen port or the RPC port.
pub trait DefaultConfigurationValues {
	/// The port Substrate should listen on for p2p connections.
	///
	/// By default this is `30333`.
	fn p2p_listen_port() -> u16 {
		30333
	}

	/// The port Substrate should listen on for JSON-RPC connections.
	///
	/// By default this is `9944`.
	fn rpc_listen_port() -> u16 {
		RPC_DEFAULT_PORT
	}

	/// The port Substrate should listen on for prometheus connections.
	///
	/// By default this is `9615`.
	fn prometheus_listen_port() -> u16 {
		9615
	}
}

impl DefaultConfigurationValues for () {}

/// A trait that allows converting an object to a Configuration
pub trait CliConfiguration<DCV: DefaultConfigurationValues = ()>: Sized {
	/// Get the SharedParams for this object
	fn shared_params(&self) -> &SharedParams;

	/// Get the ImportParams for this object
	fn import_params(&self) -> Option<&ImportParams> {
		None
	}

	/// Get the PruningParams for this object
	fn pruning_params(&self) -> Option<&PruningParams> {
		self.import_params().map(|x| &x.pruning_params)
	}

	/// Get the KeystoreParams for this object
	fn keystore_params(&self) -> Option<&KeystoreParams> {
		None
	}

	/// Get the NetworkParams for this object
	fn network_params(&self) -> Option<&NetworkParams> {
		None
	}

	/// Get a reference to `OffchainWorkerParams` for this object.
	fn offchain_worker_params(&self) -> Option<&OffchainWorkerParams> {
		None
	}

	/// Get the NodeKeyParams for this object
	fn node_key_params(&self) -> Option<&NodeKeyParams> {
		self.network_params().map(|x| &x.node_key_params)
	}

	/// Get the DatabaseParams for this object
	fn database_params(&self) -> Option<&DatabaseParams> {
		self.import_params().map(|x| &x.database_params)
	}

	/// Get the base path of the configuration (if any)
	///
	/// By default this is retrieved from `SharedParams`.
	fn base_path(&self) -> Result<Option<BasePath>> {
		self.shared_params().base_path()
	}

	/// Returns `true` if the node is for development or not
	///
	/// By default this is retrieved from `SharedParams`.
	fn is_dev(&self) -> Result<bool> {
		Ok(self.shared_params().is_dev())
	}

	/// Gets the role
	///
	/// By default this is `Role::Full`.
	fn role(&self, _is_dev: bool) -> Result<Role> {
		Ok(Role::Full)
	}

	/// Get the transaction pool options
	///
	/// By default this is `TransactionPoolOptions::default()`.
	fn transaction_pool(&self, _is_dev: bool) -> Result<TransactionPoolOptions> {
		Ok(Default::default())
	}

	/// Get the network configuration
	///
	/// By default this is retrieved from `NetworkParams` if it is available otherwise it creates
	/// a default `NetworkConfiguration` based on `node_name`, `client_id`, `node_key` and
	/// `net_config_dir`.
	fn network_config(
		&self,
		chain_spec: &Box<dyn ChainSpec>,
		is_dev: bool,
		is_validator: bool,
		net_config_dir: PathBuf,
		client_id: &str,
		node_name: &str,
		node_key: NodeKeyConfig,
		default_listen_port: u16,
	) -> Result<NetworkConfiguration> {
		let network_config = if let Some(network_params) = self.network_params() {
			network_params.network_config(
				chain_spec,
				is_dev,
				is_validator,
				Some(net_config_dir),
				client_id,
				node_name,
				node_key,
				default_listen_port,
			)
		} else {
			NetworkConfiguration::new(node_name, client_id, node_key, Some(net_config_dir))
		};

		// TODO: Return error here in the next release:
		// https://github.com/paritytech/polkadot-sdk/issues/5266
		// if is_validator && network_config.public_addresses.is_empty() {}

		Ok(network_config)
	}

	/// Get the keystore configuration.
	///
	/// By default this is retrieved from `KeystoreParams` if it is available. Otherwise it uses
	/// `KeystoreConfig::InMemory`.
	fn keystore_config(&self, config_dir: &PathBuf) -> Result<KeystoreConfig> {
		self.keystore_params()
			.map(|x| x.keystore_config(config_dir))
			.unwrap_or_else(|| Ok(KeystoreConfig::InMemory))
	}

	/// Get the database cache size.
	///
	/// By default this is retrieved from `DatabaseParams` if it is available. Otherwise its `None`.
	fn database_cache_size(&self) -> Result<Option<usize>> {
		Ok(self.database_params().map(|x| x.database_cache_size()).unwrap_or_default())
	}

	/// Get the database backend variant.
	///
	/// By default this is retrieved from `DatabaseParams` if it is available. Otherwise its `None`.
	fn database(&self) -> Result<Option<Database>> {
		Ok(self.database_params().and_then(|x| x.database()))
	}

	/// Get the database configuration object for the parameters provided
	fn database_config(
		&self,
		base_path: &PathBuf,
		cache_size: usize,
		database: Database,
	) -> Result<DatabaseSource> {
		let role_dir = "full";
		let rocksdb_path = base_path.join("db").join(role_dir);
		let paritydb_path = base_path.join("paritydb").join(role_dir);
		Ok(match database {
			#[cfg(feature = "rocksdb")]
			Database::RocksDb => DatabaseSource::RocksDb { path: rocksdb_path, cache_size },
			Database::ParityDb => DatabaseSource::ParityDb { path: paritydb_path },
			Database::ParityDbDeprecated => {
				eprintln!(
					"WARNING: \"paritydb-experimental\" database setting is deprecated and will be removed in future releases. \
				Please update your setup to use the new value: \"paritydb\"."
				);
				DatabaseSource::ParityDb { path: paritydb_path }
			},
			Database::Auto => DatabaseSource::Auto { paritydb_path, rocksdb_path, cache_size },
		})
	}

	/// Get the trie cache maximum size.
	///
	/// By default this is retrieved from `ImportParams` if it is available. Otherwise its `0`.
	/// If `None` is returned the trie cache is disabled.
	fn trie_cache_maximum_size(&self) -> Result<Option<usize>> {
		Ok(self.import_params().map(|x| x.trie_cache_maximum_size()).unwrap_or_default())
	}

	/// Get the state pruning mode.
	///
	/// By default this is retrieved from `PruningMode` if it is available. Otherwise its
	/// `PruningMode::default()`.
	fn state_pruning(&self) -> Result<Option<PruningMode>> {
		self.pruning_params()
			.map(|x| x.state_pruning())
			.unwrap_or_else(|| Ok(Default::default()))
	}

	/// Get the block pruning mode.
	///
	/// By default this is retrieved from `block_pruning` if it is available. Otherwise its
	/// `BlocksPruning::KeepFinalized`.
	fn blocks_pruning(&self) -> Result<BlocksPruning> {
		self.pruning_params()
			.map(|x| x.blocks_pruning())
			.unwrap_or_else(|| Ok(BlocksPruning::KeepFinalized))
	}

	/// Get the chain ID (string).
	///
	/// By default this is retrieved from `SharedParams`.
	fn chain_id(&self, is_dev: bool) -> Result<String> {
		Ok(self.shared_params().chain_id(is_dev))
	}

	/// Get the name of the node.
	///
	/// By default a random name is generated.
	fn node_name(&self) -> Result<String> {
		Ok(generate_node_name())
	}

	/// Get the WASM execution method.
	///
	/// By default this is retrieved from `ImportParams` if it is available. Otherwise its
	/// `WasmExecutionMethod::default()`.
	fn wasm_method(&self) -> Result<WasmExecutionMethod> {
		Ok(self.import_params().map(|x| x.wasm_method()).unwrap_or_default())
	}

	/// Get the path where WASM overrides live.
	///
	/// By default this is `None`.
	fn wasm_runtime_overrides(&self) -> Option<PathBuf> {
		self.import_params().map(|x| x.wasm_runtime_overrides()).unwrap_or_default()
	}

	/// Get the RPC address.
	fn rpc_addr(&self, _default_listen_port: u16) -> Result<Option<Vec<RpcEndpoint>>> {
		Ok(None)
	}

	/// Returns the RPC method set to expose.
	///
	/// By default this is `RpcMethods::Auto` (unsafe RPCs are denied iff
	/// `rpc_external` returns true, respectively).
	fn rpc_methods(&self) -> Result<RpcMethods> {
		Ok(Default::default())
	}

	/// Get the maximum number of RPC server connections.
	fn rpc_max_connections(&self) -> Result<u32> {
		Ok(RPC_DEFAULT_MAX_CONNECTIONS)
	}

	/// Get the RPC cors (`None` if disabled)
	///
	/// By default this is `Some(Vec::new())`.
	fn rpc_cors(&self, _is_dev: bool) -> Result<Option<Vec<String>>> {
		Ok(Some(Vec::new()))
	}

	/// Get maximum RPC request payload size.
	fn rpc_max_request_size(&self) -> Result<u32> {
		Ok(RPC_DEFAULT_MAX_REQUEST_SIZE_MB)
	}

	/// Get maximum RPC response payload size.
	fn rpc_max_response_size(&self) -> Result<u32> {
		Ok(RPC_DEFAULT_MAX_RESPONSE_SIZE_MB)
	}

	/// Get maximum number of subscriptions per connection.
	fn rpc_max_subscriptions_per_connection(&self) -> Result<u32> {
		Ok(RPC_DEFAULT_MAX_SUBS_PER_CONN)
	}

	/// The number of messages the RPC server is allowed to keep in memory per connection.
	fn rpc_buffer_capacity_per_connection(&self) -> Result<u32> {
		Ok(RPC_DEFAULT_MESSAGE_CAPACITY_PER_CONN)
	}

	/// RPC server batch request configuration.
	fn rpc_batch_config(&self) -> Result<RpcBatchRequestConfig> {
		Ok(RpcBatchRequestConfig::Unlimited)
	}

	/// RPC rate limit configuration.
	fn rpc_rate_limit(&self) -> Result<Option<NonZeroU32>> {
		Ok(None)
	}

	/// RPC rate limit whitelisted ip addresses.
	fn rpc_rate_limit_whitelisted_ips(&self) -> Result<Vec<IpNetwork>> {
		Ok(vec![])
	}

	/// RPC rate limit trust proxy headers.
	fn rpc_rate_limit_trust_proxy_headers(&self) -> Result<bool> {
		Ok(false)
	}

	/// Get the prometheus configuration (`None` if disabled)
	///
	/// By default this is `None`.
	fn prometheus_config(
		&self,
		_default_listen_port: u16,
		_chain_spec: &Box<dyn ChainSpec>,
	) -> Result<Option<PrometheusConfig>> {
		Ok(None)
	}

	/// Get the telemetry endpoints (if any)
	///
	/// By default this is retrieved from the chain spec loaded by `load_spec`.
	fn telemetry_endpoints(
		&self,
		chain_spec: &Box<dyn ChainSpec>,
	) -> Result<Option<TelemetryEndpoints>> {
		Ok(chain_spec.telemetry_endpoints().clone())
	}

	/// Get the default value for heap pages
	///
	/// By default this is `None`.
	fn default_heap_pages(&self) -> Result<Option<u64>> {
		Ok(None)
	}

	/// Returns an offchain worker config wrapped in `Ok(_)`
	///
	/// By default offchain workers are disabled.
	fn offchain_worker(&self, role: &Role) -> Result<OffchainWorkerConfig> {
		self.offchain_worker_params()
			.map(|x| x.offchain_worker(role))
			.unwrap_or_else(|| Ok(OffchainWorkerConfig::default()))
	}

	/// Returns `Ok(true)` if authoring should be forced
	///
	/// By default this is `false`.
	fn force_authoring(&self) -> Result<bool> {
		Ok(Default::default())
	}

	/// Returns `Ok(true)` if grandpa should be disabled
	///
	/// By default this is `false`.
	fn disable_grandpa(&self) -> Result<bool> {
		Ok(Default::default())
	}

	/// Get the development key seed from the current object
	///
	/// By default this is `None`.
	fn dev_key_seed(&self, _is_dev: bool) -> Result<Option<String>> {
		Ok(Default::default())
	}

	/// Get the tracing targets from the current object (if any)
	///
	/// By default this is retrieved from [`SharedParams`] if it is available. Otherwise its
	/// `None`.
	fn tracing_targets(&self) -> Result<Option<String>> {
		Ok(self.shared_params().tracing_targets())
	}

	/// Get the TracingReceiver value from the current object
	///
	/// By default this is retrieved from [`SharedParams`] if it is available. Otherwise its
	/// `TracingReceiver::default()`.
	fn tracing_receiver(&self) -> Result<TracingReceiver> {
		Ok(self.shared_params().tracing_receiver())
	}

	/// Get the node key from the current object
	///
	/// By default this is retrieved from `NodeKeyParams` if it is available. Otherwise its
	/// `NodeKeyConfig::default()`.
	fn node_key(&self, net_config_dir: &PathBuf) -> Result<NodeKeyConfig> {
		let is_dev = self.is_dev()?;
		let role = self.role(is_dev)?;
		self.node_key_params()
			.map(|x| x.node_key(net_config_dir, role, is_dev))
			.unwrap_or_else(|| Ok(Default::default()))
	}

	/// Get maximum runtime instances
	///
	/// By default this is `None`.
	fn max_runtime_instances(&self) -> Result<Option<usize>> {
		Ok(Default::default())
	}

	/// Get maximum different runtimes in cache
	///
	/// By default this is `2`.
	fn runtime_cache_size(&self) -> Result<u8> {
		Ok(2)
	}

	/// Activate or not the automatic announcing of blocks after import
	///
	/// By default this is `false`.
	fn announce_block(&self) -> Result<bool> {
		Ok(true)
	}

	/// Create a Configuration object from the current object
	fn create_configuration<C: SubstrateCli>(
		&self,
		cli: &C,
		tokio_handle: tokio::runtime::Handle,
	) -> Result<Configuration> {
		let is_dev = self.is_dev()?;
		let chain_id = self.chain_id(is_dev)?;
		let chain_spec = cli.load_spec(&chain_id)?;
		let base_path = base_path_or_default(self.base_path()?, &C::executable_name());
		let config_dir = build_config_dir(&base_path, chain_spec.id());
		let net_config_dir = build_net_config_dir(&config_dir);
		let client_id = C::client_id();
		let database_cache_size = self.database_cache_size()?.unwrap_or(1024);
		let database = self.database()?.unwrap_or(
			#[cfg(feature = "rocksdb")]
			{
				Database::RocksDb
			},
			#[cfg(not(feature = "rocksdb"))]
			{
				Database::ParityDb
			},
		);
		let node_key = self.node_key(&net_config_dir)?;
		let role = self.role(is_dev)?;
		let max_runtime_instances = self.max_runtime_instances()?.unwrap_or(8);
		let is_validator = role.is_authority();
		let keystore = self.keystore_config(&config_dir)?;
		let telemetry_endpoints = self.telemetry_endpoints(&chain_spec)?;
		let runtime_cache_size = self.runtime_cache_size()?;

		let rpc_addrs: Option<Vec<sc_service::config::RpcEndpoint>> = self
			.rpc_addr(DCV::rpc_listen_port())?
			.map(|addrs| addrs.into_iter().map(Into::into).collect());

		Ok(Configuration {
			impl_name: C::impl_name(),
			impl_version: C::impl_version(),
			tokio_handle,
			transaction_pool: self.transaction_pool(is_dev)?,
			network: self.network_config(
				&chain_spec,
				is_dev,
				is_validator,
				net_config_dir,
				client_id.as_str(),
				self.node_name()?.as_str(),
				node_key,
				DCV::p2p_listen_port(),
			)?,
			keystore,
			database: self.database_config(&config_dir, database_cache_size, database)?,
			data_path: config_dir,
			trie_cache_maximum_size: self.trie_cache_maximum_size()?,
			state_pruning: self.state_pruning()?,
			blocks_pruning: self.blocks_pruning()?,
			executor: ExecutorConfiguration {
				wasm_method: self.wasm_method()?,
				default_heap_pages: self.default_heap_pages()?,
				max_runtime_instances,
				runtime_cache_size,
			},
			wasm_runtime_overrides: self.wasm_runtime_overrides(),
			rpc: RpcConfiguration {
				addr: rpc_addrs,
				methods: self.rpc_methods()?,
				max_connections: self.rpc_max_connections()?,
				cors: self.rpc_cors(is_dev)?,
				max_request_size: self.rpc_max_request_size()?,
				max_response_size: self.rpc_max_response_size()?,
				id_provider: None,
				max_subs_per_conn: self.rpc_max_subscriptions_per_connection()?,
				port: DCV::rpc_listen_port(),
				message_buffer_capacity: self.rpc_buffer_capacity_per_connection()?,
				batch_config: self.rpc_batch_config()?,
				rate_limit: self.rpc_rate_limit()?,
				rate_limit_whitelisted_ips: self.rpc_rate_limit_whitelisted_ips()?,
				rate_limit_trust_proxy_headers: self.rpc_rate_limit_trust_proxy_headers()?,
			},
			prometheus_config: self
				.prometheus_config(DCV::prometheus_listen_port(), &chain_spec)?,
			telemetry_endpoints,
			offchain_worker: self.offchain_worker(&role)?,
			force_authoring: self.force_authoring()?,
			disable_grandpa: self.disable_grandpa()?,
			dev_key_seed: self.dev_key_seed(is_dev)?,
			tracing_targets: self.tracing_targets()?,
			tracing_receiver: self.tracing_receiver()?,
			chain_spec,
			announce_block: self.announce_block()?,
			role,
			base_path,
		})
	}

	/// Get the filters for the logging.
	///
	/// This should be a list of comma-separated values.
	/// Example: `foo=trace,bar=debug,baz=info`
	///
	/// By default this is retrieved from `SharedParams`.
	fn log_filters(&self) -> Result<String> {
		Ok(self.shared_params().log_filters().join(","))
	}

	/// Should the detailed log output be enabled.
	fn detailed_log_output(&self) -> Result<bool> {
		Ok(self.shared_params().detailed_log_output())
	}

	/// Is log reloading enabled?
	fn enable_log_reloading(&self) -> Result<bool> {
		Ok(self.shared_params().enable_log_reloading())
	}

	/// Should the log color output be disabled?
	fn disable_log_color(&self) -> Result<bool> {
		Ok(self.shared_params().disable_log_color())
	}

	/// Initialize substrate. This must be done only once per process.
	///
	/// This method:
	///
	/// 1. Sets the panic handler
	/// 2. Optionally customize logger/profiling
	/// 2. Initializes the logger
	/// 3. Raises the FD limit
	///
	/// The `logger_hook` closure is executed before the logger is constructed
	/// and initialized. It is useful for setting up a custom profiler.
	///
	/// Example:
	/// ```
	/// use sc_tracing::{SpanDatum, TraceEvent};
	/// struct TestProfiler;
	///
	/// impl sc_tracing::TraceHandler for TestProfiler {
	///  	fn handle_span(&self, sd: &SpanDatum) {}
	/// 		fn handle_event(&self, _event: &TraceEvent) {}
	/// };
	///
	/// fn logger_hook() -> impl FnOnce(&mut sc_cli::LoggerBuilder, &sc_service::Configuration) -> () {
	/// 	|logger_builder, config| {
	/// 			logger_builder.with_custom_profiling(Box::new(TestProfiler{}));
	/// 	}
	/// }
	/// ```
	fn init<F>(&self, support_url: &String, impl_version: &String, logger_hook: F) -> Result<()>
	where
		F: FnOnce(&mut LoggerBuilder),
	{
		sp_panic_handler::set(support_url, impl_version);

		let mut logger = LoggerBuilder::new(self.log_filters()?);
		logger
			.with_log_reloading(self.enable_log_reloading()?)
			.with_detailed_output(self.detailed_log_output()?);

		if let Some(tracing_targets) = self.tracing_targets()? {
			let tracing_receiver = self.tracing_receiver()?;
			logger.with_profiling(tracing_receiver, tracing_targets);
		}

		if self.disable_log_color()? {
			logger.with_colors(false);
		}

		// Call hook for custom profiling setup.
		logger_hook(&mut logger);

		logger.init()?;

		match fdlimit::raise_fd_limit() {
			Ok(fdlimit::Outcome::LimitRaised { to, .. }) =>
				if to < RECOMMENDED_OPEN_FILE_DESCRIPTOR_LIMIT {
					warn!(
						"Low open file descriptor limit configured for the process. \
						Current value: {:?}, recommended value: {:?}.",
						to, RECOMMENDED_OPEN_FILE_DESCRIPTOR_LIMIT,
					);
				},
			Ok(fdlimit::Outcome::Unsupported) => {
				// Unsupported platform (non-Linux)
			},
			Err(error) => {
				warn!(
					"Failed to configure file descriptor limit for the process: \
					{}, recommended value: {:?}.",
					error, RECOMMENDED_OPEN_FILE_DESCRIPTOR_LIMIT,
				);
			},
		}

		Ok(())
	}
}

/// Generate a valid random name for the node
pub fn generate_node_name() -> String {
	loop {
		let node_name = Generator::with_naming(Name::Numbered)
			.next()
			.expect("RNG is available on all supported platforms; qed");
		let count = node_name.chars().count();

		if count < NODE_NAME_MAX_LENGTH {
			return node_name
		}
	}
}

/// Returns the value of `base_path` or the default_path if it is None
pub(crate) fn base_path_or_default(
	base_path: Option<BasePath>,
	executable_name: &String,
) -> BasePath {
	base_path.unwrap_or_else(|| BasePath::from_project("", "", executable_name))
}

/// Returns the default path for configuration  directory based on the chain_spec
pub(crate) fn build_config_dir(base_path: &BasePath, chain_spec_id: &str) -> PathBuf {
	base_path.config_dir(chain_spec_id)
}

/// Returns the default path for the network configuration inside the configuration dir
pub(crate) fn build_net_config_dir(config_dir: &PathBuf) -> PathBuf {
	config_dir.join(DEFAULT_NETWORK_CONFIG_PATH)
}

/// Returns the default path for the network directory starting from the provided base_path
/// or from the default base_path.
pub(crate) fn build_network_key_dir_or_default(
	base_path: Option<BasePath>,
	chain_spec_id: &str,
	executable_name: &String,
) -> PathBuf {
	let config_dir =
		build_config_dir(&base_path_or_default(base_path, executable_name), chain_spec_id);
	build_net_config_dir(&config_dir)
}