fix(web): job log polls while active, one service history limit (#7)

internal/master/web/server.go

@@ -23,6 +23,9 @@ import (
 //go:embed templates/*.html static/*
 var assets embed.FS
 
+// serviceJobsLimit is how many jobs the service page lists.
+const serviceJobsLimit = 20
+
 var agentNamePattern = regexp.MustCompile(`^[a-z0-9][a-z0-9-]{0,62}$`)
 
 // Store is the storage the UI reads and writes. *store.Store satisfies it.
@@ -203,7 +206,7 @@ func (s *Server) serviceDetail(r *http.Request, id int64) (pageData, error) {
 	} else if err != nil {
 		return data, err
 	}
-	data.Jobs, err = s.store.ListJobs(r.Context(), model.JobFilter{ServiceID: id, Limit: 20})
+	data.Jobs, err = s.store.ListJobs(r.Context(), model.JobFilter{ServiceID: id, Limit: serviceJobsLimit})
 	return data, err
 }
 
@@ -225,7 +228,7 @@ func (s *Server) serviceJobsFragment(w http.ResponseWriter, r *http.Request) {
 	if !ok {
 		return
 	}
-	jobs, err := s.store.ListJobs(r.Context(), model.JobFilter{ServiceID: id, Limit: 20})
+	jobs, err := s.store.ListJobs(r.Context(), model.JobFilter{ServiceID: id, Limit: serviceJobsLimit})
 	if err != nil {
 		s.fail(w, err)
 		return