Development Update — April 2

Skywire: DMSG gRPC Listener

A new remote-management capability: DMSG gRPC listener for remote gotop and stats (#2271).

Design — a new DmsgGRPCPort (49) serves gRPC over DMSG alongside the existing local CLI gRPC. The DialDmsgRPC function was updated to dial the new port instead of DmsgHypervisorPort. This enables:

• Remote gotop (system activity monitor) over DMSG
• Stats streaming from any visor to any other visor
• Ping and latency measurements between visors

Both visors need the update — the local visor dials the new port and the remote visor listens on it. Once deployed, operators can run skywire cli visor ping or stream system activity from any visor they have authorized access to, all over the encrypted DMSG overlay.

Iterative DFS vertex aliasing fix — the route calculator’s iterative DFS (from yesterday’s OOM fix) had a subtle bug where the same vertex could appear multiple times in the pending set with different keys, causing the DFS to process it more than once. Fixed by using a pending map for canonical vertices.

VPN E2E test reliability — DMSG retry and traceroute fixes for flaky VPN end-to-end tests.

Skywire: UPDATE_CHANNEL Config

New config variable (#2273, #2274) — UPDATE_CHANNEL can now be set to stable, develop, latest, or a specific commit hash. This controls which build the Skywire updater pulls, enabling per-visor channel selection without rebuilding.

Restart test timing fixes — the routing rule expiry wait was increased from 10s to 15s, and SendSkyMessage’s HTTP timeout was reduced from 30s to 15s with 6 retries and exponential backoff (3s, 6s, 9s, …) for faster failure cycling.

Skywire: Dmsghttp Log Server Enhancements

The dmsghttp log server (used by the reward system to pull visor surveys and logs) gained:

• /debug/pprof/* endpoints behind whitelist auth (combining survey_whitelist + hypervisors + dmsgpty_whitelist)
• /visor.log behind whitelist auth (requires -s flag on the visor to enable log saving)
• A landing page at / with links to all available endpoints

The systemd service template was updated to use -ps flags (pprof + save-log) by default. Operators running visors as systemd services will automatically get these features on their next update.

DMSG: Keyfile and scriptExec Consolidation

--keyfile flag for dmsg-discovery (#364) — systemd-friendly key management. Instead of embedding the secret key in the config file or as a command-line argument, it can now be read from a dedicated key file with proper permissions.

scriptExec shared library — scriptExec* helpers were duplicated between dmsgweb and dmsgwebsrv (~220 lines). These were moved to a shared cmdutil.Skyenv* library in the vendored skywire-utilities package. Fixes the Windows array bug (inverted len check) and PowerShell quoting issues that were previously fixed only in skywire.

dmsghttp test hang fix — timeouts added to result reads and client-ready waits in the dmsghttp tests.

Conf file integration tests — added for both dmsgweb and dmsgweb srv commands.