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100 lines
2.9 KiB
100 lines
2.9 KiB
package server
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import (
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"net/http"
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"reflect"
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"strings"
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"github.com/tendermint/tendermint/libs/log"
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)
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// RegisterRPCFuncs adds a route for each function in the funcMap, as well as
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// general jsonrpc and websocket handlers for all functions. "result" is the
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// interface on which the result objects are registered, and is popualted with
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// every RPCResponse
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func RegisterRPCFuncs(mux *http.ServeMux, funcMap map[string]*RPCFunc, logger log.Logger) {
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// HTTP endpoints
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for funcName, rpcFunc := range funcMap {
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mux.HandleFunc("/"+funcName, makeHTTPHandler(rpcFunc, logger))
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}
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// JSONRPC endpoints
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mux.HandleFunc("/", handleInvalidJSONRPCPaths(makeJSONRPCHandler(funcMap, logger)))
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}
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// Function introspection
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// RPCFunc contains the introspected type information for a function
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type RPCFunc struct {
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f reflect.Value // underlying rpc function
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args []reflect.Type // type of each function arg
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returns []reflect.Type // type of each return arg
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argNames []string // name of each argument
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ws bool // websocket only
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cache bool // allow the RPC response can be cached by the proxy cache server
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}
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// NewRPCFunc wraps a function for introspection.
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// f is the function, args are comma separated argument names
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// cache is a bool value to allow the client proxy server to cache the RPC results
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func NewRPCFunc(f interface{}, args string, cache bool) *RPCFunc {
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return newRPCFunc(f, args, false, cache)
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}
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// NewWSRPCFunc wraps a function for introspection and use in the websockets.
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func NewWSRPCFunc(f interface{}, args string) *RPCFunc {
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return newRPCFunc(f, args, true, false)
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}
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func newRPCFunc(f interface{}, args string, ws bool, c bool) *RPCFunc {
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var argNames []string
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if args != "" {
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argNames = strings.Split(args, ",")
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}
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return &RPCFunc{
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f: reflect.ValueOf(f),
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args: funcArgTypes(f),
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returns: funcReturnTypes(f),
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argNames: argNames,
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ws: ws,
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cache: c,
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}
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}
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// return a function's argument types
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func funcArgTypes(f interface{}) []reflect.Type {
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t := reflect.TypeOf(f)
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n := t.NumIn()
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typez := make([]reflect.Type, n)
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for i := 0; i < n; i++ {
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typez[i] = t.In(i)
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}
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return typez
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}
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// return a function's return types
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func funcReturnTypes(f interface{}) []reflect.Type {
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t := reflect.TypeOf(f)
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n := t.NumOut()
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typez := make([]reflect.Type, n)
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for i := 0; i < n; i++ {
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typez[i] = t.Out(i)
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}
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return typez
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}
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//-------------------------------------------------------------
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// NOTE: assume returns is result struct and error. If error is not nil, return it
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func unreflectResult(returns []reflect.Value) (interface{}, error) {
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errV := returns[1]
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if err, ok := errV.Interface().(error); ok && err != nil {
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return nil, err
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}
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rv := returns[0]
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// the result is a registered interface,
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// we need a pointer to it so we can marshal with type byte
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rvp := reflect.New(rv.Type())
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rvp.Elem().Set(rv)
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return rvp.Interface(), nil
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}
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