Replace logging backend to log4rs and add log rotation (#1789)

* Replace logging backend to flexi-logger and add log rotation
* Changed flexi_logger to log4rs
* Disable logging level filtering in Root logger
* Support different logging levels for file and stdout
* Don't log messages from modules other than Grin-related
* Fix formatting
* Place backed up compressed log copies into log file directory
* Increase default log file size to 16 MiB
* Add comment to config file on log_max_size option

core/Cargo.toml

@@ -20,7 +20,7 @@ rand = "0.5"
 serde = "1"
 serde_derive = "1"
 siphasher = "0.2"
-slog = { version = "~2.3", features = ["max_level_trace", "release_max_level_trace"] }
+log = "0.4"
 chrono = "0.4.4"
 
 grin_keychain = { path = "../keychain" }

core/src/core/block.rs

@@ -36,7 +36,7 @@ use global;
 use keychain::{self, BlindingFactor};
 use pow::{Difficulty, Proof, ProofOfWork};
 use ser::{self, PMMRable, Readable, Reader, Writeable, Writer};
-use util::{secp, static_secp_instance, LOGGER};
+use util::{secp, static_secp_instance};
 
 /// Errors thrown by Block validation
 #[derive(Debug, Clone, Eq, PartialEq, Fail)]
@@ -425,12 +425,7 @@ impl Block {
 	/// Note: caller must validate the block themselves, we do not validate it
 	/// here.
 	pub fn hydrate_from(cb: CompactBlock, txs: Vec<Transaction>) -> Result<Block, Error> {
-		trace!(
-			LOGGER,
-			"block: hydrate_from: {}, {} txs",
-			cb.hash(),
-			txs.len(),
-		);
+		trace!("block: hydrate_from: {}, {} txs", cb.hash(), txs.len(),);
 
 		let header = cb.header.clone();
 

core/src/core/pmmr/pmmr.rs

@@ -22,7 +22,6 @@ use core::merkle_proof::MerkleProof;
 use core::pmmr::{Backend, ReadonlyPMMR};
 use core::BlockHeader;
 use ser::{PMMRIndexHashable, PMMRable};
-use util::LOGGER;
 
 /// 64 bits all ones: 0b11111111...1
 const ALL_ONES: u64 = u64::MAX;
@@ -137,7 +136,7 @@ where
 
 	/// Build a Merkle proof for the element at the given position.
 	pub fn merkle_proof(&self, pos: u64) -> Result<MerkleProof, String> {
-		debug!(LOGGER, "merkle_proof  {}, last_pos {}", pos, self.last_pos);
+		debug!("merkle_proof  {}, last_pos {}", pos, self.last_pos);
 
 		// check this pos is actually a leaf in the MMR
 		if !is_leaf(pos) {
@@ -384,14 +383,14 @@ where
 					None => hashes.push_str(&format!("{:>8} ", "??")),
 				}
 			}
-			trace!(LOGGER, "{}", idx);
-			trace!(LOGGER, "{}", hashes);
+			trace!("{}", idx);
+			trace!("{}", hashes);
 		}
 	}
 
 	/// Prints PMMR statistics to the logs, used for debugging.
 	pub fn dump_stats(&self) {
-		debug!(LOGGER, "pmmr: unpruned - {}", self.unpruned_size());
+		debug!("pmmr: unpruned - {}", self.unpruned_size());
 		self.backend.dump_stats();
 	}
 
@@ -418,8 +417,8 @@ where
 					None => hashes.push_str(&format!("{:>8} ", " .")),
 				}
 			}
-			debug!(LOGGER, "{}", idx);
-			debug!(LOGGER, "{}", hashes);
+			debug!("{}", idx);
+			debug!("{}", hashes);
 		}
 	}
 }

core/src/core/verifier_cache.rs

@@ -19,7 +19,6 @@ use lru_cache::LruCache;
 
 use core::hash::{Hash, Hashed};
 use core::{Output, TxKernel};
-use util::LOGGER;
 
 /// Verifier cache for caching expensive verification results.
 /// Specifically the following -
@@ -72,7 +71,6 @@ impl VerifierCache for LruVerifierCache {
 			}).cloned()
 			.collect::<Vec<_>>();
 		debug!(
-			LOGGER,
 			"lru_verifier_cache: kernel sigs: {}, not cached (must verify): {}",
 			kernels.len(),
 			res.len()
@@ -91,7 +89,6 @@ impl VerifierCache for LruVerifierCache {
 			}).cloned()
 			.collect::<Vec<_>>();
 		debug!(
-			LOGGER,
 			"lru_verifier_cache: rangeproofs: {}, not cached (must verify): {}",
 			outputs.len(),
 			res.len()

core/src/lib.rs

@@ -38,7 +38,7 @@ extern crate serde;
 extern crate serde_derive;
 extern crate siphasher;
 #[macro_use]
-extern crate slog;
+extern crate log;
 extern crate chrono;
 extern crate failure;
 #[macro_use]