Configuration reload

[romac]

Crate

ibc-relayer, ibc-relayer-cli

Summary

Add ability for Hermes to reload the configuration from disk without restarting it.

Problem Definition

At the moment, for Hermes to pick any change to its configuration, operators need to stop and restart Hermes.

We want to provide a mechanism to trigger a reloading of Hermes configuration without having to restart it, eg. via a POSIX signal (typically SIGHUP).

Proposal

• Add ability to parse the configuration from disk at runtime
• Perform a diff from the currently loaded configuration and the new one
• Spawn or shutdown the appropriate workers based on the configuration changes
• Hook up the SIGHUP signal to trigger a config reload

Acceptance Criteria

The relayer reacts to a SIGHUP signal by reloading the configuration and spawning or shutting down the affected workers.

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate milestone (priority) applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned