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516 lines
15 KiB
516 lines
15 KiB
package rpcserver
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"net/http"
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"reflect"
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"sort"
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"time"
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"github.com/gorilla/websocket"
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. "github.com/tendermint/go-common"
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"github.com/tendermint/go-wire"
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"github.com/tendermint/tendermint/events"
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ctypes "github.com/tendermint/tendermint/rpc/core/types"
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. "github.com/tendermint/tendermint/rpc/types"
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"github.com/tendermint/tendermint/types"
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)
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func RegisterRPCFuncs(mux *http.ServeMux, funcMap map[string]*RPCFunc) {
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// HTTP endpoints
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for funcName, rpcFunc := range funcMap {
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mux.HandleFunc("/"+funcName, makeHTTPHandler(rpcFunc))
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}
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// JSONRPC endpoints
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mux.HandleFunc("/", makeJSONRPCHandler(funcMap))
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}
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//-------------------------------------
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// function introspection
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// holds all type information for each 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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}
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// wraps a function for quicker introspection
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func NewRPCFunc(f interface{}, args []string) *RPCFunc {
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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: args,
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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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// function introspection
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//-----------------------------------------------------------------------------
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// rpc.json
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// jsonrpc calls grab the given method's function info and runs reflect.Call
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func makeJSONRPCHandler(funcMap map[string]*RPCFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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b, _ := ioutil.ReadAll(r.Body)
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// if its an empty request (like from a browser),
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// just display a list of functions
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if len(b) == 0 {
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writeListOfEndpoints(w, r, funcMap)
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return
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}
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var request RPCRequest
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err := json.Unmarshal(b, &request)
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if err != nil {
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WriteRPCResponse(w, NewRPCResponse("", nil, err.Error()))
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return
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}
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if len(r.URL.Path) > 1 {
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WriteRPCResponse(w, NewRPCResponse(request.ID, nil, fmt.Sprintf("Invalid JSONRPC endpoint %s", r.URL.Path)))
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return
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}
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rpcFunc := funcMap[request.Method]
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if rpcFunc == nil {
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WriteRPCResponse(w, NewRPCResponse(request.ID, nil, "RPC method unknown: "+request.Method))
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return
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}
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args, err := jsonParamsToArgs(rpcFunc, request.Params)
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if err != nil {
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WriteRPCResponse(w, NewRPCResponse(request.ID, nil, err.Error()))
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return
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}
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returns := rpcFunc.f.Call(args)
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log.Info("HTTPJSONRPC", "method", request.Method, "args", args, "returns", returns)
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result, err := unreflectResult(returns)
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if err != nil {
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WriteRPCResponse(w, NewRPCResponse(request.ID, nil, err.Error()))
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return
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}
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WriteRPCResponse(w, NewRPCResponse(request.ID, result, ""))
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}
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}
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// covert a list of interfaces to properly typed values
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func jsonParamsToArgs(rpcFunc *RPCFunc, params []interface{}) ([]reflect.Value, error) {
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if len(rpcFunc.argNames) != len(params) {
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return nil, errors.New(fmt.Sprintf("Expected %v parameters (%v), got %v (%v)",
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len(rpcFunc.argNames), rpcFunc.argNames, len(params), params))
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}
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values := make([]reflect.Value, len(params))
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for i, p := range params {
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ty := rpcFunc.args[i]
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v, err := _jsonObjectToArg(ty, p)
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if err != nil {
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return nil, err
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}
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values[i] = v
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}
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return values, nil
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}
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func _jsonObjectToArg(ty reflect.Type, object interface{}) (reflect.Value, error) {
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var err error
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v := reflect.New(ty)
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wire.ReadJSONObjectPtr(v.Interface(), object, &err)
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if err != nil {
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return v, err
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}
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v = v.Elem()
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return v, nil
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}
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// rpc.json
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//-----------------------------------------------------------------------------
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// rpc.http
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// convert from a function name to the http handler
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func makeHTTPHandler(rpcFunc *RPCFunc) func(http.ResponseWriter, *http.Request) {
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return func(w http.ResponseWriter, r *http.Request) {
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args, err := httpParamsToArgs(rpcFunc, r)
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if err != nil {
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WriteRPCResponse(w, NewRPCResponse("", nil, err.Error()))
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return
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}
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returns := rpcFunc.f.Call(args)
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log.Info("HTTPRestRPC", "method", r.URL.Path, "args", args, "returns", returns)
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result, err := unreflectResult(returns)
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if err != nil {
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WriteRPCResponse(w, NewRPCResponse("", nil, err.Error()))
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return
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}
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WriteRPCResponse(w, NewRPCResponse("", result, ""))
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}
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}
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// Covert an http query to a list of properly typed values.
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// To be properly decoded the arg must be a concrete type from tendermint (if its an interface).
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func httpParamsToArgs(rpcFunc *RPCFunc, r *http.Request) ([]reflect.Value, error) {
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argTypes := rpcFunc.args
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argNames := rpcFunc.argNames
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var err error
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values := make([]reflect.Value, len(argNames))
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for i, name := range argNames {
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ty := argTypes[i]
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arg := GetParam(r, name)
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values[i], err = _jsonStringToArg(ty, arg)
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if err != nil {
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return nil, err
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}
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}
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return values, nil
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}
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func _jsonStringToArg(ty reflect.Type, arg string) (reflect.Value, error) {
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var err error
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v := reflect.New(ty)
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wire.ReadJSONPtr(v.Interface(), []byte(arg), &err)
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if err != nil {
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return v, err
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}
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v = v.Elem()
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return v, nil
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}
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// rpc.http
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//-----------------------------------------------------------------------------
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// rpc.websocket
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const (
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writeChanCapacity = 20
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wsWriteTimeoutSeconds = 30 // each write times out after this
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wsReadTimeoutSeconds = 30 // connection times out if we haven't received *anything* in this long, not even pings.
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wsPingTickerSeconds = 10 // send a ping every PingTickerSeconds.
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)
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// a single websocket connection
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// contains listener id, underlying ws connection,
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// and the event switch for subscribing to events
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type WSConnection struct {
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QuitService
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id string
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baseConn *websocket.Conn
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writeChan chan RPCResponse
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readTimeout *time.Timer
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pingTicker *time.Ticker
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funcMap map[string]*RPCFunc
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evsw *events.EventSwitch
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}
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// new websocket connection wrapper
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func NewWSConnection(baseConn *websocket.Conn, funcMap map[string]*RPCFunc, evsw *events.EventSwitch) *WSConnection {
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wsc := &WSConnection{
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id: baseConn.RemoteAddr().String(),
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baseConn: baseConn,
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writeChan: make(chan RPCResponse, writeChanCapacity), // error when full.
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funcMap: funcMap,
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evsw: evsw,
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}
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wsc.QuitService = *NewQuitService(log, "WSConnection", wsc)
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return wsc
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}
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// wsc.Start() blocks until the connection closes.
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func (wsc *WSConnection) OnStart() error {
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wsc.QuitService.OnStart()
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// Read subscriptions/unsubscriptions to events
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go wsc.readRoutine()
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// Custom Ping handler to touch readTimeout
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wsc.readTimeout = time.NewTimer(time.Second * wsReadTimeoutSeconds)
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wsc.pingTicker = time.NewTicker(time.Second * wsPingTickerSeconds)
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wsc.baseConn.SetPingHandler(func(m string) error {
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wsc.baseConn.WriteControl(websocket.PongMessage, []byte(m), time.Now().Add(time.Second*wsWriteTimeoutSeconds))
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wsc.readTimeout.Reset(time.Second * wsReadTimeoutSeconds)
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return nil
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})
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wsc.baseConn.SetPongHandler(func(m string) error {
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wsc.readTimeout.Reset(time.Second * wsReadTimeoutSeconds)
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return nil
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})
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go wsc.readTimeoutRoutine()
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// Write responses, BLOCKING.
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wsc.writeRoutine()
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return nil
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}
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func (wsc *WSConnection) OnStop() {
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wsc.QuitService.OnStop()
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wsc.evsw.RemoveListener(wsc.id)
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wsc.readTimeout.Stop()
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wsc.pingTicker.Stop()
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// The write loop closes the websocket connection
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// when it exits its loop, and the read loop
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// closes the writeChan
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}
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func (wsc *WSConnection) readTimeoutRoutine() {
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select {
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case <-wsc.readTimeout.C:
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log.Notice("Stopping connection due to read timeout")
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wsc.Stop()
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case <-wsc.Quit:
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return
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}
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}
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// Attempt to write response to writeChan and record failures
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func (wsc *WSConnection) writeRPCResponse(resp RPCResponse) {
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select {
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case wsc.writeChan <- resp:
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default:
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log.Notice("Stopping connection due to writeChan overflow", "id", wsc.id)
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wsc.Stop() // writeChan capacity exceeded, error.
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}
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}
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// Read from the socket and subscribe to or unsubscribe from events
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func (wsc *WSConnection) readRoutine() {
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// Do not close writeChan, to allow writeRPCResponse() to fail.
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// defer close(wsc.writeChan)
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for {
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select {
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case <-wsc.Quit:
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return
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default:
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var in []byte
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// Do not set a deadline here like below:
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// wsc.baseConn.SetReadDeadline(time.Now().Add(time.Second * wsReadTimeoutSeconds))
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// The client may not send anything for a while.
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// We use `readTimeout` to handle read timeouts.
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_, in, err := wsc.baseConn.ReadMessage()
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if err != nil {
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log.Notice("Failed to read from connection", "id", wsc.id)
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// an error reading the connection,
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// kill the connection
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wsc.Stop()
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return
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}
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var request RPCRequest
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err = json.Unmarshal(in, &request)
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if err != nil {
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errStr := fmt.Sprintf("Error unmarshaling data: %s", err.Error())
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wsc.writeRPCResponse(NewRPCResponse(request.ID, nil, errStr))
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continue
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}
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switch request.Method {
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case "subscribe":
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if len(request.Params) != 1 {
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wsc.writeRPCResponse(NewRPCResponse(request.ID, nil, "subscribe takes 1 event parameter string"))
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continue
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}
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if event, ok := request.Params[0].(string); !ok {
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wsc.writeRPCResponse(NewRPCResponse(request.ID, nil, "subscribe takes 1 event parameter string"))
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continue
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} else {
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log.Notice("Subscribe to event", "id", wsc.id, "event", event)
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wsc.evsw.AddListenerForEvent(wsc.id, event, func(msg types.EventData) {
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// NOTE: RPCResponses of subscribed events have id suffix "#event"
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wsc.writeRPCResponse(NewRPCResponse(request.ID+"#event", ctypes.ResultEvent{event, msg}, ""))
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})
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continue
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}
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case "unsubscribe":
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if len(request.Params) == 0 {
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log.Notice("Unsubscribe from all events", "id", wsc.id)
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wsc.evsw.RemoveListener(wsc.id)
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wsc.writeRPCResponse(NewRPCResponse(request.ID, nil, ""))
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continue
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} else if len(request.Params) == 1 {
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if event, ok := request.Params[0].(string); !ok {
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wsc.writeRPCResponse(NewRPCResponse(request.ID, nil, "unsubscribe takes 0 or 1 event parameter strings"))
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continue
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} else {
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log.Notice("Unsubscribe from event", "id", wsc.id, "event", event)
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wsc.evsw.RemoveListenerForEvent(event, wsc.id)
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wsc.writeRPCResponse(NewRPCResponse(request.ID, nil, ""))
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continue
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}
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} else {
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wsc.writeRPCResponse(NewRPCResponse(request.ID, nil, "unsubscribe takes 0 or 1 event parameter strings"))
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continue
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}
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default:
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rpcFunc := wsc.funcMap[request.Method]
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if rpcFunc == nil {
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wsc.writeRPCResponse(NewRPCResponse(request.ID, nil, "RPC method unknown: "+request.Method))
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continue
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}
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args, err := jsonParamsToArgs(rpcFunc, request.Params)
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if err != nil {
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wsc.writeRPCResponse(NewRPCResponse(request.ID, nil, err.Error()))
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continue
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}
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returns := rpcFunc.f.Call(args)
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log.Info("WSJSONRPC", "method", request.Method, "args", args, "returns", returns)
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result, err := unreflectResult(returns)
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if err != nil {
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wsc.writeRPCResponse(NewRPCResponse(request.ID, nil, err.Error()))
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continue
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} else {
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wsc.writeRPCResponse(NewRPCResponse(request.ID, result, ""))
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continue
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}
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}
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}
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}
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}
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// receives on a write channel and writes out on the socket
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func (wsc *WSConnection) writeRoutine() {
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defer wsc.baseConn.Close()
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var n, err = int(0), error(nil)
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for {
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select {
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case <-wsc.Quit:
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return
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case <-wsc.pingTicker.C:
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err := wsc.baseConn.WriteMessage(websocket.PingMessage, []byte{})
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if err != nil {
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log.Error("Failed to write ping message on websocket", "error", err)
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wsc.Stop()
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return
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}
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case msg := <-wsc.writeChan:
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buf := new(bytes.Buffer)
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wire.WriteJSON(msg, buf, &n, &err)
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if err != nil {
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log.Error("Failed to marshal RPCResponse to JSON", "error", err)
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} else {
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wsc.baseConn.SetWriteDeadline(time.Now().Add(time.Second * wsWriteTimeoutSeconds))
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if err = wsc.baseConn.WriteMessage(websocket.TextMessage, buf.Bytes()); err != nil {
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log.Warn("Failed to write response on websocket", "error", err)
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wsc.Stop()
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return
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}
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}
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}
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}
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}
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//----------------------------------------
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// Main manager for all websocket connections
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// Holds the event switch
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// NOTE: The websocket path is defined externally, e.g. in node/node.go
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type WebsocketManager struct {
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websocket.Upgrader
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funcMap map[string]*RPCFunc
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evsw *events.EventSwitch
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}
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func NewWebsocketManager(funcMap map[string]*RPCFunc, evsw *events.EventSwitch) *WebsocketManager {
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return &WebsocketManager{
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funcMap: funcMap,
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evsw: evsw,
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Upgrader: websocket.Upgrader{
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ReadBufferSize: 1024,
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WriteBufferSize: 1024,
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CheckOrigin: func(r *http.Request) bool {
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// TODO
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return true
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},
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},
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}
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}
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// Upgrade the request/response (via http.Hijack) and starts the WSConnection.
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func (wm *WebsocketManager) WebsocketHandler(w http.ResponseWriter, r *http.Request) {
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wsConn, err := wm.Upgrade(w, r, nil)
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if err != nil {
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// TODO - return http error
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log.Error("Failed to upgrade to websocket connection", "error", err)
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return
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}
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// register connection
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con := NewWSConnection(wsConn, wm.funcMap, wm.evsw)
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log.Notice("New websocket connection", "origin", con.id)
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con.Start() // Blocking
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}
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// rpc.websocket
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//-----------------------------------------------------------------------------
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// 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 errV.Interface() != nil {
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return nil, fmt.Errorf("%v", errV.Interface())
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}
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return returns[0].Interface(), nil
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}
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// writes a list of available rpc endpoints as an html page
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func writeListOfEndpoints(w http.ResponseWriter, r *http.Request, funcMap map[string]*RPCFunc) {
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noArgNames := []string{}
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argNames := []string{}
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for name, funcData := range funcMap {
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if len(funcData.args) == 0 {
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noArgNames = append(noArgNames, name)
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} else {
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argNames = append(argNames, name)
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}
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}
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sort.Strings(noArgNames)
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sort.Strings(argNames)
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buf := new(bytes.Buffer)
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buf.WriteString("<html><body>")
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buf.WriteString("<br>Available endpoints:<br>")
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for _, name := range noArgNames {
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link := fmt.Sprintf("http://%s/%s", r.Host, name)
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buf.WriteString(fmt.Sprintf("<a href=\"%s\">%s</a></br>", link, link))
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}
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buf.WriteString("<br>Endpoints that require arguments:<br>")
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for _, name := range argNames {
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link := fmt.Sprintf("http://%s/%s?", r.Host, name)
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funcData := funcMap[name]
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for i, argName := range funcData.argNames {
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link += argName + "=_"
|
|
if i < len(funcData.argNames)-1 {
|
|
link += "&"
|
|
}
|
|
}
|
|
buf.WriteString(fmt.Sprintf("<a href=\"%s\">%s</a></br>", link, link))
|
|
}
|
|
buf.WriteString("</body></html>")
|
|
w.Header().Set("Content-Type", "text/html")
|
|
w.WriteHeader(200)
|
|
w.Write(buf.Bytes())
|
|
}
|