feat(storage): local binding errors for bad requests (#2763)

dbolduc · web-flow · commit 03f8b6bb98c5 · 2025-07-24T19:15:43.000-04:00
diff --git a/internal/api/model.go b/internal/api/model.go
@@ -14,7 +14,10 @@
 
 package api
 
-import "slices"
+import (
+	"slices"
+	"strings"
+)
 
 // Typez represent different field types that may be found in messages.
 type Typez int
@@ -344,6 +347,18 @@ type RoutingInfoVariant struct {
 	Codec any
 }
 
+func (v *RoutingInfoVariant) FieldName() string {
+	return strings.Join(v.FieldPath, ".")
+}
+
+func (v *RoutingInfoVariant) TemplateAsString() string {
+	var full []string
+	full = append(full, v.Prefix.Segments...)
+	full = append(full, v.Matching.Segments...)
+	full = append(full, v.Suffix.Segments...)
+	return strings.Join(full, "/")
+}
+
 type RoutingPathSpec struct {
 	// A sequence of matching segments.
 	//
diff --git a/internal/rust/templates/grpc-client/routinginfo.mustache b/internal/rust/templates/grpc-client/routinginfo.mustache
@@ -30,3 +30,28 @@ let x_goog_request_params = {
         {{/Routing}}
     ])
 };
+{{#Codec.RoutingRequired}}
+if x_goog_request_params.is_empty() {
+    use gax::error::binding::BindingError;
+    use gaxi::routing_parameter::Segment;
+    use gaxi::path_parameter::PathMismatchBuilder;
+    let mut paths = Vec::new();
+    {{#Routing}}
+    {{#Variants}}
+    {
+        let builder = PathMismatchBuilder::default().maybe_add(
+            Some(&req){{#Codec.FieldAccessors}}{{{.}}}{{/Codec.FieldAccessors}},
+            &[
+                {{#Codec.PrefixSegments}}{{{.}}}, {{/Codec.PrefixSegments}}
+                {{#Codec.MatchingSegments}}{{{.}}}, {{/Codec.MatchingSegments}}
+                {{#Codec.SuffixSegments}}{{{.}}}, {{/Codec.SuffixSegments}}
+            ],
+            "{{FieldName}}",
+            "{{{TemplateAsString}}}");
+        paths.push(builder.build());
+    }
+    {{/Variants}}
+    {{/Routing}}
+    return Err(gax::error::Error::binding(BindingError { paths }))
+}
+{{/Codec.RoutingRequired}}
