build: generate openapi from grpc

buf.gen.yaml

@@ -1,10 +1,12 @@
 version: v1
+
 plugins:
   # core apis
   - name: go
     out: rpc/flipt
     opt:
       - paths=source_relative
+      - Mgnostic/openapi/v3/annotations.proto=github.com/google/gnostic-models/openapiv3
     strategy: all
   - name: go-grpc
     out: rpc/flipt
@@ -23,3 +25,12 @@ plugins:
       - paths=source_relative
       - grpc_api_configuration=rpc/flipt/flipt.yaml
     strategy: all
+  - plugin: buf.build/community/google-gnostic-openapi
+    out: sdk
+    opt:
+      - version=1.47.0
+      - fq_schema_naming=false
+      - default_response=false
+      - title=api
+      - description=
+

go.mod

@@ -192,6 +192,7 @@ require (
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/protobuf v1.5.4 // indirect
 	github.com/google/flatbuffers v24.3.25+incompatible // indirect
+	github.com/google/gnostic-models v0.6.9-0.20230804172637-c7be7c783f49 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
 	github.com/google/pprof v0.0.0-20240509144519-723abb6459b7 // indirect
 	github.com/google/s2a-go v0.1.7 // indirect

go.sum

@@ -354,6 +354,8 @@ github.com/golang/snappy v0.0.4 h1:yAGX7huGHXlcLOEtBnF4w7FQwA26wojNCwOYAEhLjQM=
 github.com/golang/snappy v0.0.4/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/google/flatbuffers v24.3.25+incompatible h1:CX395cjN9Kke9mmalRoL3d81AtFUxJM+yDthflgJGkI=
 github.com/google/flatbuffers v24.3.25+incompatible/go.mod h1:1AeVuKshWv4vARoZatz6mlQ0JxURH0Kv5+zNeJKJCa8=
+github.com/google/gnostic-models v0.6.9-0.20230804172637-c7be7c783f49 h1:0VpGH+cDhbDtdcweoyCVsF3fhN8kejK6rFe/2FFX2nU=
+github.com/google/gnostic-models v0.6.9-0.20230804172637-c7be7c783f49/go.mod h1:BkkQ4L1KS1xMt2aWSPStnn55ChGC0DPOn2FQYj+f25M=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=

internal/cmd/protoc-gen-go-flipt-sdk/http.go

@@ -9,6 +9,7 @@ import (
 	"google.golang.org/genproto/googleapis/api/serviceconfig"
 	"google.golang.org/protobuf/compiler/protogen"
 	"google.golang.org/protobuf/encoding/protojson"
+	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/reflect/protoreflect"
 	"sigs.k8s.io/yaml"
 )
@@ -32,6 +33,21 @@ func generateHTTP(gen *protogen.Plugin, grpcAPIConfig string) {
 	}
 
 	m := mappings{}
+
+	for _, f := range gen.Files {
+		if !f.Generate {
+			continue
+		}
+		for _, s := range f.Services {
+			for _, m := range s.Methods {
+				if rule := proto.GetExtension(m.Desc.Options(), annotations.E_Http).(*annotations.HttpRule); rule != nil {
+					rule.Selector = string(m.Desc.FullName())
+					config.Http.Rules = append(config.Http.Rules, rule)
+				}
+			}
+		}
+	}
+
 	for _, r := range config.Http.Rules {
 		rule := rule{
 			body: r.Body == "*",
@@ -53,7 +69,6 @@ func generateHTTP(gen *protogen.Plugin, grpcAPIConfig string) {
 		default:
 			fmt.Fprintf(os.Stderr, "unsupported pattern: %T\n", r.Pattern)
 		}
-
 		m[r.Selector] = rule
 	}