通过ASM入口网关实现HTTP请求网格内gRPC服务

option(google.api.http) = {
  get: "/v1/talk/{data}/{meta}"
};

import "google/api/annotations.proto";
service LandingService {
  //Unary RPC
  rpc talk (TalkRequest) returns (TalkResponse) {
    option(google.api.http) = {
      get: "/v1/talk/{data}/{meta}"
    };
  }
...
}

message TalkRequest {
  string data = 1;
  string meta = 2;
}

# https://github.com/AliyunContainerService/hello-servicemesh-grpc
proto_path={path/to/hello-servicemesh-grpc}/proto
# https://github.com/grpc-ecosystem/grpc-gateway/tree/master/third_party/
proto_dep_path={path/to/third_party}
protoc \
    --proto_path=${proto_path} \
    --proto_path=${proto_dep_path} \
    --include_imports \
    --include_source_info \
    --descriptor_set_out=landing.proto-descriptor \
    "${proto_path}"/landing.proto

grpc-transcoder \
--version 1.7 \
--service_port 9996 \
--service_name grpc-server-svc \
--proto_pkg org.feuyeux.grpc \
--proto_svc LandingService \
--descriptor landing.proto-descriptor

• version：ASM实例的版本。
• service_port：gRPC服务端口。
• service_name：gRPC服务名称。
• proto_pkg：gRPC服务.proto包名的定义。
• proto_svc：gRPC服务.proto中服务名的定义。
• descriptor：Proto Descriptors文件本地路径。

#Generated by ASM(http://servicemesh.console.aliyun.com)
#GRPC Transcoder EnvoyFilter[1.7]
apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: grpc-transcoder-grpc-server-svc
spec:
  workloadSelector:
    labels:
      app: istio-ingressgateway
  configPatches:
    - applyTo: HTTP_FILTER
      match:
        context: GATEWAY
        listener:
          portNumber: 9996
          filterChain:
            filter:
              name: "envoy.filters.network.http_connection_manager"
              subFilter:
                name: "envoy.filters.http.router"
        proxy:
          proxyVersion: ^1\.7.*
      patch:
        operation: INSERT_BEFORE
        value:
          name: envoy.grpc_json_transcoder
          typed_config:
            '@type': type.googleapis.com/envoy.extensions.filters.http.grpc_json_transcoder.v3.GrpcJsonTranscoder
            proto_descriptor_bin: Ctl4ChVnb29nbGUvYXBpL2h0dHAucHJ...
            services: 
            - org.feuyeux.grpc.LandingService
            print_options:
              add_whitespace: true
              always_print_primitive_fields: true
              always_print_enums_as_ints: false
              preserve_proto_field_names: false

#获取入口网关POD名称
ingressgateway_pod=$(kubectl get pod -l app="istio-ingressgateway" -n istio-system -o jsonpath='{.items[0].metadata.name}')
#时间戳
timestamp=$(date "+%Y%m%d-%H%M%S")
#获取envoy动态配置并保存到dynamic_listeners-"$timestamp".json
kubectl -n istio-system exec $ingressgateway_pod \
  -c istio-proxy \
  -- curl -s "http://localhost:15000/config_dump?dynamic_listeners" >dynamic_listeners-"$timestamp".json
#确认配置中存在GrpcJsonTranscoder
grep -B3 -A7 GrpcJsonTranscoder dynamic_listeners-"$timestamp".json

{
  "name": "envoy.grpc_json_transcoder",
  "typed_config": {
    "@type": "type.googleapis.com/envoy.extensions.filters.http.grpc_json_transcoder.v3.GrpcJsonTranscoder",
    "services": [
      "org.feuyeux.grpc.LandingService"
    ],
    "print_options": {
      "add_whitespace": true,
      "always_print_primitive_fields": true
    },
    ...

• .proto文件定义的请求接口

  rpc talk (TalkRequest) returns (TalkResponse) {
    option(google.api.http) = {
      get: "/v1/talk/{data}/{meta}"
    };
  }

• .proto文件定义的响应声明

  message TalkResponse {
    int32 status = 1;
    repeated TalkResult results = 2;
  }
  
  message TalkResult {
    //timestamp
    int64 id = 1;
    //enum
    ResultType type = 2;
    // id:result uuid
    // idx:language index
    // data: hello
    // meta: serverside language
    map<string, string> kv = 3;
  }
  
  enum ResultType {
    OK = 0;
    FAIL = 1;
  }

#获取入口网关IP
INGRESS_IP=$(k -n istio-system get service istio-ingressgateway -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
#http请求入口网关的9996端口,/v1/talk/{data}/{meta}路径
curl http://$INGRESS_IP:9996/v1/talk/0/java

{
 "status": 200,
 "results": [
  {
   "id": "699882576081691",
   "type": "OK",
   "kv": {
    "data": "Hello",
    "meta": "JAVA",
    "id": "8c175d5c-d8a3-4197-a7f8-6e3e0ab1fe59",
    "idx": "0"
   }
  }
 ]
}