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195 lines
4.9 KiB
195 lines
4.9 KiB
package rpcserver
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import (
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"encoding/hex"
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"net/http"
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"reflect"
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"strings"
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"github.com/pkg/errors"
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amino "github.com/tendermint/go-amino"
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"github.com/tendermint/tendermint/libs/log"
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types "github.com/tendermint/tendermint/rpc/lib/types"
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)
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///////////////////////////////////////////////////////////////////////////////
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// HTTP + URI handler
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///////////////////////////////////////////////////////////////////////////////
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// convert from a function name to the http handler
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func makeHTTPHandler(rpcFunc *RPCFunc, cdc *amino.Codec, logger log.Logger) func(http.ResponseWriter, *http.Request) {
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// Always return -1 as there's no ID here.
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dummyID := types.JSONRPCIntID(-1) // URIClientRequestID
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// Exception for websocket endpoints
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if rpcFunc.ws {
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return func(w http.ResponseWriter, r *http.Request) {
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WriteRPCResponseHTTP(w, types.RPCMethodNotFoundError(dummyID))
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}
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}
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// All other endpoints
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return func(w http.ResponseWriter, r *http.Request) {
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logger.Debug("HTTP HANDLER", "req", r)
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ctx := &types.Context{HTTPReq: r}
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args := []reflect.Value{reflect.ValueOf(ctx)}
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fnArgs, err := httpParamsToArgs(rpcFunc, cdc, r)
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if err != nil {
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WriteRPCResponseHTTP(
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w,
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types.RPCInvalidParamsError(
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dummyID,
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errors.Wrap(err, "error converting http params to arguments"),
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),
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)
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return
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}
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args = append(args, fnArgs...)
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returns := rpcFunc.f.Call(args)
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logger.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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WriteRPCResponseHTTP(w, types.RPCInternalError(dummyID, err))
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return
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}
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WriteRPCResponseHTTP(w, types.NewRPCSuccessResponse(cdc, dummyID, 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, cdc *amino.Codec, r *http.Request) ([]reflect.Value, error) {
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// skip types.Context
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const argsOffset = 1
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values := make([]reflect.Value, len(rpcFunc.argNames))
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for i, name := range rpcFunc.argNames {
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argType := rpcFunc.args[i+argsOffset]
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values[i] = reflect.Zero(argType) // set default for that type
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arg := GetParam(r, name)
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// log.Notice("param to arg", "argType", argType, "name", name, "arg", arg)
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if arg == "" {
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continue
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}
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v, ok, err := nonJSONStringToArg(cdc, argType, arg)
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if err != nil {
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return nil, err
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}
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if ok {
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values[i] = v
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continue
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}
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values[i], err = jsonStringToArg(cdc, argType, 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(cdc *amino.Codec, rt reflect.Type, arg string) (reflect.Value, error) {
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rv := reflect.New(rt)
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err := cdc.UnmarshalJSON([]byte(arg), rv.Interface())
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if err != nil {
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return rv, err
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}
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rv = rv.Elem()
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return rv, nil
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}
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func nonJSONStringToArg(cdc *amino.Codec, rt reflect.Type, arg string) (reflect.Value, bool, error) {
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if rt.Kind() == reflect.Ptr {
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rv1, ok, err := nonJSONStringToArg(cdc, rt.Elem(), arg)
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switch {
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case err != nil:
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return reflect.Value{}, false, err
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case ok:
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rv := reflect.New(rt.Elem())
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rv.Elem().Set(rv1)
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return rv, true, nil
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default:
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return reflect.Value{}, false, nil
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}
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} else {
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return _nonJSONStringToArg(cdc, rt, arg)
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}
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}
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// NOTE: rt.Kind() isn't a pointer.
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func _nonJSONStringToArg(cdc *amino.Codec, rt reflect.Type, arg string) (reflect.Value, bool, error) {
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isIntString := ReInt.Match([]byte(arg))
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isQuotedString := strings.HasPrefix(arg, `"`) && strings.HasSuffix(arg, `"`)
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isHexString := strings.HasPrefix(strings.ToLower(arg), "0x")
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var expectingString, expectingByteSlice, expectingInt bool
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switch rt.Kind() {
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case reflect.Int,
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reflect.Uint,
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reflect.Int8,
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reflect.Uint8,
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reflect.Int16,
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reflect.Uint16,
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reflect.Int32,
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reflect.Uint32,
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reflect.Int64,
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reflect.Uint64:
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expectingInt = true
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case reflect.String:
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expectingString = true
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case reflect.Slice:
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expectingByteSlice = rt.Elem().Kind() == reflect.Uint8
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}
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if isIntString && expectingInt {
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qarg := `"` + arg + `"`
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rv, err := jsonStringToArg(cdc, rt, qarg)
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if err != nil {
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return rv, false, err
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}
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return rv, true, nil
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}
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if isHexString {
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if !expectingString && !expectingByteSlice {
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err := errors.Errorf("got a hex string arg, but expected '%s'",
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rt.Kind().String())
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return reflect.ValueOf(nil), false, err
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}
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var value []byte
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value, err := hex.DecodeString(arg[2:])
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if err != nil {
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return reflect.ValueOf(nil), false, err
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}
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if rt.Kind() == reflect.String {
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return reflect.ValueOf(string(value)), true, nil
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}
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return reflect.ValueOf(value), true, nil
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}
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if isQuotedString && expectingByteSlice {
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v := reflect.New(reflect.TypeOf(""))
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err := cdc.UnmarshalJSON([]byte(arg), v.Interface())
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if err != nil {
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return reflect.ValueOf(nil), false, err
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}
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v = v.Elem()
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return reflect.ValueOf([]byte(v.String())), true, nil
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}
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return reflect.ValueOf(nil), false, nil
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}
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