You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
103 lines
2.4 KiB
103 lines
2.4 KiB
/*
|
|
HTTP RPC server supporting calls via uri params, jsonrpc, and jsonrpc over websockets
|
|
|
|
# Client Requests
|
|
|
|
Suppose we want to expose the rpc function `HelloWorld(name string, num int)`.
|
|
|
|
## GET (URI)
|
|
|
|
As a GET request, it would have URI encoded parameters, and look like:
|
|
|
|
```
|
|
curl 'http://localhost:8008/hello_world?name="my_world"&num=5'
|
|
```
|
|
|
|
Note the `'` around the url, which is just so bash doesn't ignore the quotes in `"my_world"`.
|
|
This should also work:
|
|
|
|
```
|
|
curl http://localhost:8008/hello_world?name=\"my_world\"&num=5
|
|
```
|
|
|
|
A GET request to `/` returns a list of available endpoints.
|
|
For those which take arguments, the arguments will be listed in order, with `_` where the actual value should be.
|
|
|
|
## POST (JSONRPC)
|
|
|
|
As a POST request, we use JSONRPC. For instance, the same request would have this as the body:
|
|
|
|
```
|
|
{
|
|
"jsonrpc": "2.0",
|
|
"id": "anything",
|
|
"method": "hello_world",
|
|
"params": {
|
|
"name": "my_world",
|
|
"num": 5
|
|
}
|
|
}
|
|
```
|
|
|
|
With the above saved in file `data.json`, we can make the request with
|
|
|
|
```
|
|
curl --data @data.json http://localhost:8008
|
|
```
|
|
|
|
## WebSocket (JSONRPC)
|
|
|
|
All requests are exposed over websocket in the same form as the POST JSONRPC.
|
|
Websocket connections are available at their own endpoint, typically `/websocket`,
|
|
though this is configurable when starting the server.
|
|
|
|
# Server Definition
|
|
|
|
Define some types and routes:
|
|
|
|
```
|
|
type ResultStatus struct {
|
|
Value string
|
|
}
|
|
|
|
// Define some routes
|
|
var Routes = map[string]*rpcserver.RPCFunc{
|
|
"status": rpcserver.NewRPCFunc(Status, "arg"),
|
|
}
|
|
|
|
// an rpc function
|
|
func Status(v string) (*ResultStatus, error) {
|
|
return &ResultStatus{v}, nil
|
|
}
|
|
|
|
```
|
|
|
|
Now start the server:
|
|
|
|
```
|
|
mux := http.NewServeMux()
|
|
rpcserver.RegisterRPCFuncs(mux, Routes)
|
|
wm := rpcserver.NewWebsocketManager(Routes)
|
|
mux.HandleFunc("/websocket", wm.WebsocketHandler)
|
|
logger := log.NewTMLogger(log.NewSyncWriter(os.Stdout))
|
|
go func() {
|
|
_, err := rpcserver.StartHTTPServer("0.0.0.0:8008", mux, logger)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
}()
|
|
|
|
```
|
|
|
|
Note that unix sockets are supported as well (eg. `/path/to/socket` instead of `0.0.0.0:8008`)
|
|
|
|
Now see all available endpoints by sending a GET request to `0.0.0.0:8008`.
|
|
Each route is available as a GET request, as a JSONRPCv2 POST request, and via JSONRPCv2 over websockets.
|
|
|
|
|
|
# Examples
|
|
|
|
* [Tendermint](https://github.com/tendermint/tendermint/blob/master/rpc/core/routes.go)
|
|
* [tm-monitor](https://github.com/tendermint/tendermint/blob/master/tools/tm-monitor/rpc.go)
|
|
*/
|
|
package rpc
|