A client for accessing a nodejs Seneca service from Go.
go get github.com/pborman/uuid
go get github.com/baldmountain/senecaIgnore the message about no buildable Go source files. We are just getting the repository.
To use the Seneca client you just create a Requester and call Act on it. There are Requesters for the tcp and web transport. All the Requesters implement the Acter interface.
type Acter interface {
Act(req interface{}, res interface{}) ([]byte, error)
io.Closer
}The io.Closer interface specifies a Close method for the Requester that
is used to close any open network connections the Requester may have opened.
The Act method takes two parameters. The first is a struct specifying the request.
It should look something like:
type echo struct {
Role string `json:"role"`
Cmd string `json:"cmd"`
Msg string `json:"msg"`
}where the fields specify the pattern of the seneca request and any parameters
sent to the Seneca action. Note the json:"role" for the Role field. This allows
us to specify a lowercase json name since the Go JSON library only encodes exported
names. (The ones that start with a capital letter.)
The second parameter to Act is a response struct to capture the reply from the service. It should include any fields that you want to decode from the response. Any extra fields in the response, that are not specified in the response struct, are discarded.
The Act method returns the JSON byte array for the response struct and an error if there was one.
To actually call the service just create either a web.Requester or a tcp.Requester and call Act on it. Pass both the request and response structs.
r := web.Requester{Host: "localhost", Port: 3030}
req := echo{Role: "echo", Cmd: "echo", Msg: "Hello, world!"}
res := &echo{}
// call the remote service
_, err := r.Act(req, res)
if err != nil {
fmt.Println("error", err)
} else {
fmt.Println(res.Msg)
}In this case the response is the same as the request so we can pass an instance of echo. Most likely you'll create a different response structure to match the response from the service.
See the example folder for an example Go program that calls a Nodejs Seneca echo service. In order to run the service you'll need a recent version of Nodejs.
NOTE: This library probably isn't thread safe. If you make requests from multiple Goroutines using the same requester you will most likely get unexpected results.
The MIT License (MIT)
Copyright (c) 2015 Geoffrey Clements
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.