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grpc-transcoding

HTTP(s) -> APISIX -> gRPC server

Proto

参数

  • content: .proto 文件的内容

添加proto

路径中最后的数字,会被用作 proto 的 id 做唯一标识,比如下面示例的 proto id1

curl http://127.0.0.1:9080/apisix/admin/proto/1 -X PUT -d '
{
    "content" : "syntax = \"proto3\";
    package helloworld;
    service Greeter {
        rpc SayHello (HelloRequest) returns (HelloReply) {}
    }
    message HelloRequest {
        string name = 1;
    }
    message HelloReply {
        string message = 1;
    }"
}'

参数

  • proto_id: .proto内容的id.
  • service: grpc服务名.
  • method: grpc服务中要调用的方法名.
  • pb_option: proto 编码过程中的转换选项. [ “int64_as_string” / “enum_as_value” / “auto_default_values” / “enable_hooks” ]

示例

使用 grpc-transcode 插件

在指定 route 中,代理 grpc 服务接口:

  • 注意: 这个 route 的属性service_protocol 必须设置为 grpc
  • 例子所代理的 grpc 服务可参考:grpc_server_example
curl http://127.0.0.1:9080/apisix/admin/routes/111 -X PUT -d '
{
    "methods": ["GET"],
    "uri": "/grpctest",
    "service_protocol": "grpc",
    "plugins": {
        "grpc-transcode": {
         "proto_id": "1",
         "service": "helloworld.Greeter",
         "method": "SayHello"
        }
    },
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:50051": 1
        }
    }
}'

测试

访问上面配置的 route:

$ curl -i http://127.0.0.1:9080/grpctest?name=world
HTTP/1.1 200 OK
Date: Fri, 16 Aug 2019 11:55:36 GMT
Content-Type: application/json
Transfer-Encoding: chunked
Connection: keep-alive
Server: APISIX web server
Proxy-Connection: keep-alive

{"message":"Hello world"}

这表示已成功代理。

使用 grpc-transcode 插件的 pb_option 选项

在指定 route 中,代理 grpc 服务接口:

选项清单

  • 枚举类型

    enum_as_name enum_as_value

  • 64位整型

    int64_as_number int64_as_string int64_as_hexstring

  • 使用默认值

    auto_default_values no_default_values use_default_values use_default_metatable

  • Hooks开关

    enable_hooks disable_hooks

curl http://127.0.0.1:9080/apisix/admin/routes/23 -X PUT -d '
{
    "methods": ["GET"],
    "uri": "/zeebe/WorkflowInstanceCreate",
    "service_protocol": "grpc",
    "plugins": {
        "grpc-transcode": {
         "proto_id": "1",
         "service": "gateway_protocol.Gateway",
         "method": "CreateWorkflowInstance",
         "pb_option":["int64_as_string"]
        }
    },
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:26500": 1
        }
    }
}'

测试

访问上面配置的 route:

$ curl -i "http://127.0.0.1:9080/zeebe/WorkflowInstanceCreate?bpmnProcessId=order-process&version=1&variables=\{\"orderId\":\"7\",\"ordervalue\":99\}"
HTTP/1.1 200 OK
Date: Wed, 13 Nov 2019 03:38:27 GMT
Content-Type: application/json
Transfer-Encoding: chunked
Connection: keep-alive
grpc-encoding: identity
grpc-accept-encoding: gzip
Server: APISIX web server
Trailer: grpc-status
Trailer: grpc-message

{"workflowKey":"#2251799813685260","workflowInstanceKey":"#2251799813688013","bpmnProcessId":"order-process","version":1}

"workflowKey":"#2251799813685260" 这表示已成功。