lighthouse/common
Pawan Dhananjay 99737c551a Improve eth1 fallback logging (#2490)
## Issue Addressed

Resolves #2487 

## Proposed Changes

Logs a message once in every invocation of `Eth1Service::update` method if the primary endpoint is unavailable for some reason. 

e.g.
```log
Aug 03 00:09:53.517 WARN Error connecting to eth1 node endpoint  action: trying fallbacks, endpoint: http://localhost:8545/, service: eth1_rpc
Aug 03 00:09:56.959 INFO Fetched data from fallback              fallback_number: 1, service: eth1_rpc
```

The main aim of this PR is to have an accompanying message to the "action: trying fallbacks" error message that is returned when checking the endpoint for liveness. This is mainly to indicate to the user that the fallback was live and reachable. 

## Additional info
This PR is not meant to be a catch all for all cases where the primary endpoint failed. For instance, this won't log anything if the primary node was working fine during endpoint liveness checking and failed during deposit/block fetching. This is done intentionally to reduce number of logs while initial deposit/block sync and to avoid more complicated logic.
2021-08-30 00:51:26 +00:00
..
account_utils
clap_utils
compare_fields
compare_fields_derive
deposit_contract
directory
eth2
eth2_config
eth2_interop_keypairs
eth2_network_config
eth2_wallet_manager
fallback Improve eth1 fallback logging (#2490) 2021-08-30 00:51:26 +00:00
filesystem
hashset_delay
lighthouse_metrics
lighthouse_version
lockfile
logging
lru_cache
malloc_utils
monitoring_api
remote_signer_consumer
sensitive_url
slot_clock
target_check
task_executor
test_random_derive
validator_dir
warp_utils
README.md

eth2

Common crates containing eth2-specific logic.