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.
203 lines
5.7 KiB
203 lines
5.7 KiB
package rpc
|
|
|
|
/*
|
|
TODO: support Call && GetStorage.
|
|
*/
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"github.com/tendermint/tendermint/binary"
|
|
"github.com/tendermint/tendermint/rpc/core"
|
|
"io/ioutil"
|
|
"net/http"
|
|
"reflect"
|
|
)
|
|
|
|
// cache all type information about each function up front
|
|
// (func, responseStruct, argNames)
|
|
var funcMap = map[string]*FuncWrapper{
|
|
"status": funcWrap(core.Status, []string{}),
|
|
"net_info": funcWrap(core.NetInfo, []string{}),
|
|
"blockchain": funcWrap(core.BlockchainInfo, []string{"min_height", "max_height"}),
|
|
"get_block": funcWrap(core.GetBlock, []string{"height"}),
|
|
"get_account": funcWrap(core.GetAccount, []string{"address"}),
|
|
"get_storage": funcWrap(core.GetStorage, []string{"address", "storage"}),
|
|
"call": funcWrap(core.Call, []string{"address", "data"}),
|
|
"list_validators": funcWrap(core.ListValidators, []string{}),
|
|
"dump_storage": funcWrap(core.DumpStorage, []string{"address"}),
|
|
"broadcast_tx": funcWrap(core.BroadcastTx, []string{"tx"}),
|
|
"list_accounts": funcWrap(core.ListAccounts, []string{}),
|
|
"unsafe/gen_priv_account": funcWrap(core.GenPrivAccount, []string{}),
|
|
"unsafe/sign_tx": funcWrap(core.SignTx, []string{"tx", "privAccounts"}),
|
|
}
|
|
|
|
func initHandlers() {
|
|
// HTTP endpoints
|
|
for funcName, funcInfo := range funcMap {
|
|
http.HandleFunc("/"+funcName, toHTTPHandler(funcInfo))
|
|
}
|
|
|
|
// JSONRPC endpoints
|
|
http.HandleFunc("/", JSONRPCHandler)
|
|
}
|
|
|
|
//-------------------------------------
|
|
|
|
// holds all type information for each function
|
|
type FuncWrapper struct {
|
|
f reflect.Value // function from "rpc/core"
|
|
args []reflect.Type // type of each function arg
|
|
returns []reflect.Type // type of each return arg
|
|
argNames []string // name of each argument
|
|
}
|
|
|
|
func funcWrap(f interface{}, args []string) *FuncWrapper {
|
|
return &FuncWrapper{
|
|
f: reflect.ValueOf(f),
|
|
args: funcArgTypes(f),
|
|
returns: funcReturnTypes(f),
|
|
argNames: args,
|
|
}
|
|
}
|
|
|
|
func funcArgTypes(f interface{}) []reflect.Type {
|
|
t := reflect.TypeOf(f)
|
|
n := t.NumIn()
|
|
types := make([]reflect.Type, n)
|
|
for i := 0; i < n; i++ {
|
|
types[i] = t.In(i)
|
|
}
|
|
return types
|
|
}
|
|
|
|
func funcReturnTypes(f interface{}) []reflect.Type {
|
|
t := reflect.TypeOf(f)
|
|
n := t.NumOut()
|
|
types := make([]reflect.Type, n)
|
|
for i := 0; i < n; i++ {
|
|
types[i] = t.Out(i)
|
|
}
|
|
return types
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// rpc.json
|
|
|
|
// jsonrpc calls grab the given method's function info and runs reflect.Call
|
|
func JSONRPCHandler(w http.ResponseWriter, r *http.Request) {
|
|
b, _ := ioutil.ReadAll(r.Body)
|
|
var request RPCRequest
|
|
err := json.Unmarshal(b, &request)
|
|
if err != nil {
|
|
WriteRPCResponse(w, NewRPCResponse(nil, err.Error()))
|
|
return
|
|
}
|
|
|
|
funcInfo := funcMap[request.Method]
|
|
if funcInfo == nil {
|
|
WriteRPCResponse(w, NewRPCResponse(nil, "RPC method unknown: "+request.Method))
|
|
return
|
|
}
|
|
args, err := jsonParamsToArgs(funcInfo, request.Params)
|
|
if err != nil {
|
|
WriteRPCResponse(w, NewRPCResponse(nil, err.Error()))
|
|
return
|
|
}
|
|
returns := funcInfo.f.Call(args)
|
|
response, err := unreflectResponse(returns)
|
|
if err != nil {
|
|
WriteRPCResponse(w, NewRPCResponse(nil, err.Error()))
|
|
return
|
|
}
|
|
WriteRPCResponse(w, NewRPCResponse(response, ""))
|
|
}
|
|
|
|
// covert a list of interfaces to properly typed values
|
|
func jsonParamsToArgs(funcInfo *FuncWrapper, params []interface{}) ([]reflect.Value, error) {
|
|
values := make([]reflect.Value, len(params))
|
|
for i, p := range params {
|
|
ty := funcInfo.args[i]
|
|
v, err := _jsonObjectToArg(ty, p)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
values[i] = v
|
|
}
|
|
return values, nil
|
|
}
|
|
|
|
func _jsonObjectToArg(ty reflect.Type, object interface{}) (reflect.Value, error) {
|
|
var err error
|
|
v := reflect.New(ty)
|
|
binary.ReadJSONFromObject(v.Interface(), object, &err)
|
|
if err != nil {
|
|
return v, err
|
|
}
|
|
v = v.Elem()
|
|
return v, nil
|
|
}
|
|
|
|
// rpc.json
|
|
//-----------------------------------------------------------------------------
|
|
// rpc.http
|
|
|
|
// convert from a function name to the http handler
|
|
func toHTTPHandler(funcInfo *FuncWrapper) func(http.ResponseWriter, *http.Request) {
|
|
return func(w http.ResponseWriter, r *http.Request) {
|
|
args, err := httpParamsToArgs(funcInfo, r)
|
|
if err != nil {
|
|
WriteRPCResponse(w, NewRPCResponse(nil, err.Error()))
|
|
return
|
|
}
|
|
returns := funcInfo.f.Call(args)
|
|
response, err := unreflectResponse(returns)
|
|
if err != nil {
|
|
WriteRPCResponse(w, NewRPCResponse(nil, err.Error()))
|
|
return
|
|
}
|
|
WriteRPCResponse(w, NewRPCResponse(response, ""))
|
|
}
|
|
}
|
|
|
|
// Covert an http query to a list of properly typed values.
|
|
// To be properly decoded the arg must be a concrete type from tendermint (if its an interface).
|
|
func httpParamsToArgs(funcInfo *FuncWrapper, r *http.Request) ([]reflect.Value, error) {
|
|
argTypes := funcInfo.args
|
|
argNames := funcInfo.argNames
|
|
|
|
var err error
|
|
values := make([]reflect.Value, len(argNames))
|
|
for i, name := range argNames {
|
|
ty := argTypes[i]
|
|
arg := GetParam(r, name)
|
|
values[i], err = _jsonStringToArg(ty, arg)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
return values, nil
|
|
}
|
|
|
|
func _jsonStringToArg(ty reflect.Type, arg string) (reflect.Value, error) {
|
|
var err error
|
|
v := reflect.New(ty)
|
|
binary.ReadJSON(v.Interface(), []byte(arg), &err)
|
|
if err != nil {
|
|
return v, err
|
|
}
|
|
v = v.Elem()
|
|
return v, nil
|
|
}
|
|
|
|
// rpc.http
|
|
//-----------------------------------------------------------------------------
|
|
|
|
// returns is Response struct and error. If error is not nil, return it
|
|
func unreflectResponse(returns []reflect.Value) (interface{}, error) {
|
|
errV := returns[1]
|
|
if errV.Interface() != nil {
|
|
return nil, fmt.Errorf("%v", errV.Interface())
|
|
}
|
|
return returns[0].Interface(), nil
|
|
}
|