lighthouse/slasher/Cargo.toml
Mac L fe75a0a9a1 Add background file logging (#2762)
## Issue Addressed

Closes #1996 

## Proposed Changes

Run a second `Logger` via `sloggers` which logs to a file in the background with:
- separate `debug-level` for background and terminal logging
- the ability to limit log size
- rotation through a customizable number of log files
- an option to compress old log files (`.gz` format)

Add the following new CLI flags:
- `--logfile-debug-level`: The debug level of the log files
- `--logfile-max-size`: The maximum size of each log file
- `--logfile-max-number`: The number of old log files to store
- `--logfile-compress`: Whether to compress old log files

By default background logging uses the `debug` log level and saves logfiles to:
- Beacon Node:  `$HOME/.lighthouse/$network/beacon/logs/beacon.log`
- Validator Client:  `$HOME/.lighthouse/$network/validators/logs/validator.log`

Or, when using the `--datadir` flag:
`$datadir/beacon/logs/beacon.log` and `$datadir/validators/logs/validator.log`

Once rotated, old logs are stored like so: `beacon.log.1`, `beacon.log.2` etc. 
> Note: `beacon.log.1` is always newer than `beacon.log.2`.

## Additional Info

Currently the default value of `--logfile-max-size` is 200 (MB) and `--logfile-max-number` is 5.
This means that the maximum storage space that the logs will take up by default is 1.2GB. 
(200MB x 5 from old log files + <200MB the current logfile being written to)
Happy to adjust these default values to whatever people think is appropriate. 

It's also worth noting that when logging to a file, we lose our custom `slog` formatting. This means the logfile logs look like this:
```
Oct 27 16:02:50.305 INFO Lighthouse started, version: Lighthouse/v2.0.1-8edd9d4+, module: lighthouse:413
Oct 27 16:02:50.305 INFO Configured for network, name: prater, module: lighthouse:414
```
2021-11-30 03:25:32 +00:00

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TOML

[package]
name = "slasher"
version = "0.1.0"
authors = ["Michael Sproul <michael@sigmaprime.io>"]
edition = "2018"
[dependencies]
bincode = "1.3.1"
byteorder = "1.3.4"
eth2_ssz = "0.4.0"
eth2_ssz_derive = "0.3.0"
flate2 = { version = "1.0.14", features = ["zlib"], default-features = false }
lazy_static = "1.4.0"
lighthouse_metrics = { path = "../common/lighthouse_metrics" }
filesystem = { path = "../common/filesystem" }
lmdb = "0.8"
lmdb-sys = "0.8"
parking_lot = "0.11.0"
rand = "0.7.3"
safe_arith = { path = "../consensus/safe_arith" }
serde = "1.0"
serde_derive = "1.0"
slog = "2.5.2"
sloggers = { version = "2.1.1", features = ["json"] }
tree_hash = "0.4.0"
tree_hash_derive = "0.4.0"
types = { path = "../consensus/types" }
[dev-dependencies]
maplit = "1.0.2"
rayon = "1.3.0"
tempfile = "3.1.0"
logging = { path = "../common/logging" }