feat(AIP-217): add various rules for return_partial_success support

docs/rules/0132/request-unknown-fields.md

@@ -28,6 +28,7 @@ comes across any fields other than:
 - `string request_id` ([AIP-155][])
 - `google.protobuf.FieldMask read_mask` ([AIP-157][])
 - `View view` ([AIP-157][])
+- `bool return_partial_success` ([AIP-217][])
 
 It only checks field names; it does not validate type correctness. This is
 handled by other rules, such as

docs/rules/0217/return-partial-success-type.md

@@ -0,0 +1,67 @@
+---
+rule:
+  aip: 217
+  name: [core, '0217', return-partial-success-type]
+  summary: The return_partial_success field should be a bool.
+permalink: /217/return-partial-success-type
+redirect_from:
+  - /0217/return-partial-success-type
+---
+
+# States
+
+This rule enforces that the `return_partial_success` field is a `bool`, as
+mandated in [AIP-217][].
+
+## Details
+
+This rule looks at fields named `return_partial_success`, and complains if they
+are anything other than a `bool`.
+
+## Examples
+
+**Incorrect** code for this rule:
+
+```proto
+// Incorrect.
+message ListBooksRequest {
+  string parent = 1;
+  int32 page_size = 2;
+  string page_token = 3;
+  string return_partial_success = 4;  // Should be bool.
+}
+```
+
+**Correct** code for this rule:
+
+```proto
+// Correct.
+message ListBooksRequest {
+  string parent = 1;
+  int32 page_size = 2;
+  string page_token = 3;
+  bool return_partial_success = 4;
+}
+```
+
+## Disabling
+
+If you need to violate this rule, use a leading comment above the field.
+Remember to also include an [aip.dev/not-precedent][] comment explaining why.
+
+```proto
+message ListBooksRequest {
+  string parent = 1;
+  int32 page_size = 2;
+  string page_token = 3;
+  // (-- api-linter: core::0217::return-partial-success-type=disabled
+  //     aip.dev/not-precedent: We need to do this because reasons. --)
+  string return_partial_success = 4;
+}
+```
+
+If you need to violate this rule for an entire file, place the comment at the
+top of the file.
+
+[aip-217]: https://aip.dev/217
+[aip.dev/not-precedent]: https://aip.dev/not-precedent

docs/rules/0217/return-partial-success-with-unreachable.md

@@ -0,0 +1,91 @@
+---
+rule:
+  aip: 217
+  name: [core, '0217', return-partial-success-with-unreachable]
+  summary: The return_partial_success field should be paired with unreachable.
+permalink: /217/return-partial-success-with-unreachable
+redirect_from:
+  - /0217/return-partial-success-with-unreachable
+---
+
+# States
+
+This rule enforces that the `return_partial_success` field is paired with a
+corresponding `repeated string unreachable` field, as mandated in [AIP-217][].
+
+## Details
+
+This rule looks at methods that have a request field named
+`return_partial_success`, and complains if the response does not have a
+`repeated string unreachable` field.
+
+## Examples
+
+**Incorrect** code for this rule:
+
+```proto
+message ListBooksRequest {
+  string parent = 1;
+  int32 page_size = 2;
+  string page_token = 3;
+  // Incorrect. Missing unreachable response field.
+  string return_partial_success = 4;
+}
+
+message ListBooksResponse {
+    repeated Book books = 1;
+
+    string next_page_token = 2;
+
+    // Incorrect. Missing unreachable field.
+}
+```
+
+**Correct** code for this rule:
+
+```proto
+message ListBooksRequest {
+  string parent = 1;
+  int32 page_size = 2;
+  string page_token = 3;
+  // Correct.
+  bool return_partial_success = 4;
+}
+
+message ListBooksResponse {
+    repeated Book books = 1;
+
+    string next_page_token = 2;
+
+    // Correct.
+    repeated string unreachable = 3;
+}
+```
+
+## Disabling
+
+If you need to violate this rule, use a leading comment above the field.
+Remember to also include an [aip.dev/not-precedent][] comment explaining why.
+
+```proto
+message ListBooksRequest {
+  string parent = 1;
+  int32 page_size = 2;
+  string page_token = 3;
+  // (-- api-linter: core::0217::return-partial-success-with-unreachable=disabled
+  //     aip.dev/not-precedent: We need to do this because reasons. --)
+  string return_partial_success = 4;
+}
+
+message ListBooksResponse {
+    repeated Book books = 1;
+
+    string next_page_token = 2;
+}
+```
+
+If you need to violate this rule for an entire file, place the comment at the
+top of the file.
+
+[aip-217]: https://aip.dev/217
+[aip.dev/not-precedent]: https://aip.dev/not-precedent

rules/aip0132/request_unknown_fields.go

@@ -22,16 +22,17 @@ import (
 )
 
 var allowedFields = stringset.New(
-	"parent",       // AIP-132
-	"page_size",    // AIP-158
-	"page_token",   // AIP-158
-	"skip",         // AIP-158
-	"filter",       // AIP-132
-	"order_by",     // AIP-132
-	"show_deleted", // AIP-135
-	"request_id",   // AIP-155
-	"read_mask",    // AIP-157
-	"view",         // AIP-157
+	"parent",                 // AIP-132
+	"page_size",              // AIP-158
+	"page_token",             // AIP-158
+	"skip",                   // AIP-158
+	"filter",                 // AIP-132
+	"order_by",               // AIP-132
+	"show_deleted",           // AIP-135
+	"request_id",             // AIP-155
+	"read_mask",              // AIP-157
+	"view",                   // AIP-157
+	"return_partial_success", // AIP-217
 )
 
 // List methods should not have unrecognized fields.

rules/aip0132/request_unknown_fields_test.go

@@ -46,6 +46,7 @@ func TestUnknownFields(t *testing.T) {
 		{"ShowDeleted", "ListBooksRequest", "show_deleted", builder.FieldTypeBool(), testutils.Problems{}},
 		{"RequestId", "ListBooksRequest", "request_id", builder.FieldTypeImportedMessage(fieldMask), testutils.Problems{}},
 		{"ReadMask", "ListBooksRequest", "read_mask", builder.FieldTypeImportedMessage(fieldMask), testutils.Problems{}},
+		{"ReturnPartialSuccess", "ListBooksRequest", "return_partial_success", builder.FieldTypeImportedMessage(fieldMask), testutils.Problems{}},
 		{"View", "ListBooksRequest", "view", builder.FieldTypeEnum(builder.NewEnum("View").AddValue(builder.NewEnumValue("BASIC"))), testutils.Problems{}},
 		{"Invalid", "ListBooksRequest", "application_id", builder.FieldTypeString(), testutils.Problems{{Message: "explicitly described"}}},
 		{"Irrelevant", "EnumerteBooksRequest", "application_id", builder.FieldTypeString(), testutils.Problems{}},

rules/aip0217/aip0217.go

@@ -22,6 +22,8 @@ import "github.com/googleapis/api-linter/lint"
 func AddRules(r lint.RuleRegistry) error {
 	return r.Register(
 		217,
+		returnPartialSuccessType,
+		returnPartialSuccessWithUnreachable,
 		synonyms,
 		unreachableFieldType,
 	)

rules/aip0217/return_partial_success_type.go

@@ -0,0 +1,40 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package aip0217
+
+import (
+	"github.com/googleapis/api-linter/lint"
+	"github.com/googleapis/api-linter/locations"
+	"github.com/googleapis/api-linter/rules/internal/utils"
+	"github.com/jhump/protoreflect/desc"
+)
+
+var returnPartialSuccessType = &lint.FieldRule{
+	Name: lint.NewRuleName(217, "return-partial-success-type"),
+	OnlyIf: func(f *desc.FieldDescriptor) bool {
+		return f.GetName() == "return_partial_success"
+	},
+	LintField: func(f *desc.FieldDescriptor) (problems []lint.Problem) {
+		if utils.GetTypeName(f) != "bool" {
+			problems = append(problems, lint.Problem{
+				Message:    "`return_partial_success` field must be a `bool`.",
+				Suggestion: "bool",
+				Descriptor: f,
+				Location:   locations.FieldType(f),
+			})
+		}
+		return
+	},
+}

rules/aip0217/return_partial_success_type_test.go

@@ -0,0 +1,47 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package aip0217
+
+import (
+	"testing"
+
+	"github.com/googleapis/api-linter/rules/internal/testutils"
+)
+
+func TestReturnPartialSuccessType(t *testing.T) {
+	for _, test := range []struct {
+		name     string
+		Type     string
+		problems testutils.Problems
+	}{
+		{"Valid", "bool", testutils.Problems{}},
+		{"InvalidType", "string", testutils.Problems{{Suggestion: "bool"}}},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			f := testutils.ParseProto3Tmpl(t, `
+				message ListBooksRequest {
+					string parent = 1;
+					int32 page_size = 2;
+					string page_token = 3;
+					{{.Type}} return_partial_success = 4;
+				}
+			`, test)
+			field := f.GetMessageTypes()[0].FindFieldByName("return_partial_success")
+			if diff := test.problems.SetDescriptor(field).Diff(returnPartialSuccessType.Lint(f)); diff != "" {
+				t.Errorf(diff)
+			}
+		})
+	}
+}

rules/aip0217/return_partial_success_with_unreachable.go

@@ -0,0 +1,36 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package aip0217
+
+import (
+	"github.com/googleapis/api-linter/lint"
+	"github.com/jhump/protoreflect/desc"
+)
+
+var returnPartialSuccessWithUnreachable = &lint.MethodRule{
+	Name: lint.NewRuleName(217, "return-partial-success-with-unreachable"),
+	OnlyIf: func(m *desc.MethodDescriptor) bool {
+		return m.GetInputType().FindFieldByName("return_partial_success") != nil
+	},
+	LintMethod: func(m *desc.MethodDescriptor) (problems []lint.Problem) {
+		if m.GetOutputType().FindFieldByName("unreachable") == nil {
+			problems = append(problems, lint.Problem{
+				Message:    "`return_partial_success` must be added in conjunction with response field `repeated string unreachable`.",
+				Descriptor: m.GetInputType().FindFieldByName("return_partial_success"),
+			})
+		}
+		return
+	},
+}

rules/aip0217/return_partial_success_with_unreachable_test.go

@@ -0,0 +1,55 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package aip0217
+
+import (
+	"testing"
+
+	"github.com/googleapis/api-linter/rules/internal/testutils"
+)
+
+func TestReturnPartialSuccessWithUnreachable(t *testing.T) {
+	for _, test := range []struct {
+		name          string
+		ResponseField string
+		problems      testutils.Problems
+	}{
+		{"Valid", "repeated string unreachable = 1;", testutils.Problems{}},
+		{"InvalidMissingUnreachable", "", testutils.Problems{{Message: "repeated string unreachable"}}},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			f := testutils.ParseProto3Tmpl(t, `
+				service Library {
+					rpc ListBooks(ListBooksRequest) returns (ListBooksResponse);
+				}
+
+				message ListBooksRequest {
+					string parent = 1;
+					int32 page_size = 2;
+					string page_token = 3;
+					bool return_partial_success = 4;
+				}
+
+				message ListBooksResponse {
+					{{.ResponseField}}
+				}
+			`, test)
+			field := f.GetMessageTypes()[0].FindFieldByName("return_partial_success")
+			if diff := test.problems.SetDescriptor(field).Diff(returnPartialSuccessWithUnreachable.Lint(f)); diff != "" {
+				t.Errorf(diff)
+			}
+		})
+	}
+}