apisix/docs/en/latest/plugins/grpc-transcode.md

title
grpc-transcode

Name

HTTP(s) -> APISIX -> gRPC server

Proto

Attributes

• content: .proto file's content.

Add a proto

Here's an example, adding a proto which id is 1:

curl http://127.0.0.1:9080/apisix/admin/proto/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -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;
    }"
}'

Attribute List

Name	Type	Requirement	Default	Valid	Description
proto_id	string/integer	required			.proto content id.
service	string	required			the grpc service name.
method	string	required			the method name of grpc service.
deadline	number	optional	0		deadline for grpc, ms
pb_option	array[string(pb_option_def)]	optional			protobuf options

How To Enable

Here's an example, to enable the grpc-transcode plugin to specified route:

• attention: the scheme in the route's upstream must be grpc
• the grpc server example：grpc_server_example

curl http://127.0.0.1:9080/apisix/admin/routes/111 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "methods": ["GET"],
    "uri": "/grpctest",
    "plugins": {
        "grpc-transcode": {
            "proto_id": "1",
            "service": "helloworld.Greeter",
            "method": "SayHello"
        }
    },
    "upstream": {
        "scheme": "grpc",
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:50051": 1
        }
    }
}'

Test Plugin

The above configuration proxy:

curl -i http://127.0.0.1:9080/grpctest?name=world

response:

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"}

This means that the proxying is working.

Use pb_option option of grpc-transcode plugin

option list

• enum as result

  • enum_as_name
  • enum_as_value

• int64 as result

  • int64_as_number
  • int64_as_string
  • int64_as_hexstring

• default values option

  • auto_default_values
  • no_default_values
  • use_default_values
  • use_default_metatable

• hooks option

  • enable_hooks
  • disable_hooks

curl http://127.0.0.1:9080/apisix/admin/routes/23 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "methods": ["GET"],
    "uri": "/zeebe/WorkflowInstanceCreate",
    "plugins": {
        "grpc-transcode": {
            "proto_id": "1",
            "service": "gateway_protocol.Gateway",
            "method": "CreateWorkflowInstance",
            "pb_option":["int64_as_string"]
        }
    },
    "upstream": {
        "scheme": "grpc",
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:26500": 1
        }
    }
}'

Test pb_option

Visit configured 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" suggests pb_option configuration success.

Disable Plugin

Remove the corresponding json configuration in the plugin configuration to disable grpc-transcode. APISIX plugins are hot-reloaded, therefore no need to restart APISIX.

curl http://127.0.0.1:9080/apisix/admin/routes/111 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "uri": "/grpctest",
    "plugins": {},
    "upstream": {
        "scheme": "grpc",
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:50051": 1
        }
    }
}'