Milo: Move instance configuration to luci-config

milo/appengine/buildbucket/html.go

Index: milo/appengine/buildbucket/html.go
diff --git a/milo/appengine/buildbucket/html.go b/milo/appengine/buildbucket/html.go
index cf074c5b92ab1da1ff8df8ff53dfc391da8bf232..ca484e5e428835e44f6fc08e46994e445bb6c379 100644
--- a/milo/appengine/buildbucket/html.go
+++ b/milo/appengine/buildbucket/html.go
@@ -5,22 +5,31 @@
 package buildbucket
 
 import (
+	"context"
 	"errors"
 	"net/http"
 
 	"github.com/julienschmidt/httprouter"
+	"github.com/luci/luci-go/common/logging"
 	"github.com/luci/luci-go/milo/appengine/common"
+	"github.com/luci/luci-go/milo/common/config"
 	"github.com/luci/luci-go/server/router"
 	"github.com/luci/luci-go/server/templates"
 )
 
-// TODO(nodir): move this value to luci-config.
-const defaultServer = "cr-buildbucket.appspot.com"
+func parseBuilderQuery(c context.Context, r *http.Request, p httprouter.Params) (
+	query builderQuery, err error) {
 
-func parseBuilderQuery(r *http.Request, p httprouter.Params) (query builderQuery, err error) {
 	query.Server = r.FormValue("server")
 	if query.Server == "" {
-		query.Server = defaultServer
+		var settings *config.Settings
+		settings, err = common.GetSettings(c)
+		if err != nil || settings.Buildbucket == nil {
+			logging.WithError(err).Errorf(c, "failed to get settings")
+			err = errors.New("no server specified and buildbucket settings not configured")
+			return
+		}
+		query.Server = settings.Buildbucket.Host
 	}
 
 	query.Bucket = p.ByName("bucket")
@@ -45,7 +54,7 @@ func parseBuilderQuery(r *http.Request, p httprouter.Params) (query builderQuery
 // Note: The builder html template contains self links to "?limit=123", which could
 // potentially override any other request parameters set.
 func BuilderHandler(c *router.Context) {
-	query, err := parseBuilderQuery(c.Request, c.Params)
+	query, err := parseBuilderQuery(c.Context, c.Request, c.Params)
 	if err != nil {
 		common.ErrorPage(c, http.StatusBadRequest, err.Error())
 		return