refactor(iroh-net): generalize derp naming to relay to prepare for future refactors

[ramfox]

Description

We have been making breaking changes to the DERP protocol and are planning future changes that will better take advantage of / integrate with QUIC in our hole-punching schemes.

Some notable changes:

CLI Config changes:

derp_nodes -> relay_nodes

API Changes

NodeAddr::with_derp_url -> NodeAddr::with_relay_url
NodeAddr::derp_url -> NodeAddr::relay_url
AddrInfo::derp_url -> AddrInfo::relay_url
DerpUrl -> RelayUrl
EndpointInfo::derp_url -> EndpointInfo::relay_url
DerpMode -> RelayMode
DerpMap -> RelayMap
MagicEndpointBuilder::derp_mode -> MagicEndpointBuilder::relay_mode
MagicEndpoint::my_derp -> MagicEndpoint::my_relay
default_eu_derp_node -> default_eu_relay_node
default_na_derp_node -> default_na_relay_node

CLI command changes

iroh-cli blob get --derp_url -> iroh-cli blob get --relay_url
iroh-cli doctor accept --local_derper -> iroh-cli doctor accept --local_relay_server
iroh-cli doctor connect --local_derper -> iroh-cli doctor connect --local_relay_server
iroh-cli doctor derp_urls -> iroh-cli doctor relay_urls

Derper Changes

• now called iroh-relay
• feature is iroh-relay
  To run a relay server: cargo run --bin iroh-relay --features="iroh-relay"

Change checklist

• Self-review.
• Documentation updates if relevant.
• Tests if relevant.

[Arqu]

Left some quick comments regarding the CI.

[Arqu]

This should probably also be iroh-relay but will break regardless. Need to update infra once it lands. Will file an issue for myself.

[Arqu]

To cheat for now you can do cp target/optimized-release/iroh-relay ../chuck/netsim/bins/derper given commands/args have remained the same. I can do another pass to bring all the other infra in line with the rename.

[Arqu]

cheat code derper instead of iroh-relay

[Arqu]

The logs indicate that they fail to set up a connection (given it's mostly a rename PR, functionality should remain the same). I did a manual run and saw it trying to reach default derpers which those tests shouldn't. Which pointed me to https://github.com/n0-computer/chuck/blob/main/fixtures/derp.config.toml which we feed into the iroh binary at run time.

To make things work with the current state of the PR we just need to rename [[derp_nodes]] into [[relay_nodes]] and it correctly picks up the config and works fine from there.

We can potentially roll this back to the first version you pinged me where we had everything renamed to iroh-relay and I can cook up a netsim branch that lines everything up with it. Then we just merge in succession.

[Arqu]

/netsim branch iroh-relay-cfg

[Arqu]

/netsim branch iroh-relay-cfg

[Arqu]

And we need to update the release ci script