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| author | Ludovic Courtès <ludo@gnu.org> | 2023-06-15 22:50:18 +0200 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2023-06-16 00:14:52 +0200 |
| commit | 248cf06149b4f09bfca4a21710bc8e1bd47f6e61 (patch) | |
| tree | 157fce9420ead0df70a95605031c9024ffd85f05 /guix | |
| parent | 99a27d361e5e05173106a6e6939c7099101c510a (diff) | |
avahi: Resolve hosts for which name resolution fails.
This avoids attempts to connect to hosts that went off-line. This is
particularly important for 'guix-daemon --discover', which would so far
keep attempting to talk to LAN hosts after they vanished just because
their mDNS record hasn't expired, leading to significant delays when
fetching narinfos and substitutes.
* guix/avahi.scm (avahi-browse-service-thread)[service-resolver-callback]:
Add handler to RESOLVER-EVENT/FAILURE.
Diffstat (limited to 'guix')
| -rw-r--r-- | guix/avahi.scm | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/guix/avahi.scm b/guix/avahi.scm index 132e42f268..cb0c85f9f4 100644 --- a/guix/avahi.scm +++ b/guix/avahi.scm @@ -137,7 +137,15 @@ when STOP-LOOP? procedure returns true." (port port) (txt txt)))) (hash-set! %known-hosts service-name service*) - (proc 'new-service service*))))) + (proc 'new-service service*)))) + ((eq? event resolver-event/failure) + ;; Failure to resolve the host associated with a service. This + ;; usually means that the mDNS record hasn't expired yet but that + ;; the host went off-line. + (let ((service (hash-ref %known-hosts service-name))) + (when service + (proc 'remove-service service) + (hash-remove! %known-hosts service-name))))) (free-service-resolver! resolver)) (define (service-browser-callback browser interface protocol event |