Move SearXNG instance check to nightly build

searx.space includes metrics for instance uptime, which is now
implemented as part of farside's nightly build. Accordingly, the
instance availability task built into farside now excludes searxng
instances.

Closes #95

.github/workflows/update-instances.yml

@@ -93,6 +93,7 @@ jobs:
             select(.value.version | . != null) |
             select(.value.network.asn_privacy == 0) |
             select(.value.http.error == null) |
+            select(.value.uptime.uptimeDay >= 99) |
             select(.value.tls.grade == "A+" or .value.tls.grade == "A") |
             select(.value.http.grade == "A+" or .value.http.grade == "A") |
             select(.value.html.grade == "V" or .value.html.grade == "F") |

lib/farside/instances.ex

@@ -7,6 +7,10 @@ defmodule Farside.Instances do
   @debug_header "======== "
   @debug_spacer "         "
 
+  # SearXNG instance uptimes are inspected as part of the nightly Farside build,
+  # and should not be included in the constant periodic update.
+  @skip_service_updates ["searxng"]
+
   def sync() do
     File.rename(@update_file, "#{@update_file}-prev")
     update()
@@ -51,19 +55,23 @@ defmodule Farside.Instances do
 
       IO.puts("#{@debug_header}#{service.type}")
 
-      result =
-        Enum.filter(service.instances, fn instance_url ->
-          request_url =
-            instance_url <>
-              EEx.eval_string(
-                service.test_url,
-                query: Enum.random(@queries)
-              )
-
-          IO.puts("#{@debug_spacer}#{request_url}")
-
-          request(request_url) == :good
-        end)
+      result = cond do
+        Enum.member?(@skip_service_updates, service.type) ->
+          service.instances
+        true ->
+          Enum.filter(service.instances, fn instance_url ->
+            request_url =
+              instance_url <>
+                EEx.eval_string(
+                  service.test_url,
+                  query: Enum.random(@queries)
+                )
+
+            IO.puts("#{@debug_spacer}#{request_url}")
+
+            request(request_url) == :good
+          end)
+      end
 
       add_to_db(service, result)
       log_results(service.type, result)