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260 lines
7.6 KiB
260 lines
7.6 KiB
package server
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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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tmjson "github.com/tendermint/tendermint/libs/json"
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"github.com/tendermint/tendermint/libs/log"
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ctypes "github.com/tendermint/tendermint/rpc/core/types"
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"github.com/tendermint/tendermint/rpc/jsonrpc/types"
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)
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// HTTP + JSON handler
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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, logger log.Logger) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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b, err := ioutil.ReadAll(r.Body)
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if err != nil {
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res := types.RPCInvalidRequestError(nil,
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fmt.Errorf("error reading request body: %w", err),
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)
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if wErr := WriteRPCResponseHTTPError(w, res); wErr != nil {
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logger.Error("failed to write response", "res", res, "err", wErr)
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}
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return
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}
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// if its an empty request (like from a browser), just display a list of
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// 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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// first try to unmarshal the incoming request as an array of RPC requests
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var (
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requests []types.RPCRequest
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responses []types.RPCResponse
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)
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if err := json.Unmarshal(b, &requests); err != nil {
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// next, try to unmarshal as a single request
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var request types.RPCRequest
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if err := json.Unmarshal(b, &request); err != nil {
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res := types.RPCParseError(fmt.Errorf("error unmarshaling request: %w", err))
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if wErr := WriteRPCResponseHTTPError(w, res); wErr != nil {
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logger.Error("failed to write response", "res", res, "err", wErr)
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}
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return
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}
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requests = []types.RPCRequest{request}
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}
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for _, request := range requests {
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request := request
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// A Notification is a Request object without an "id" member.
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// The Server MUST NOT reply to a Notification, including those that are within a batch request.
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if request.ID == nil {
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logger.Debug(
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"HTTPJSONRPC received a notification, skipping... (please send a non-empty ID if you want to call a method)",
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"req", request,
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)
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continue
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}
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if len(r.URL.Path) > 1 {
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responses = append(
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responses,
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types.RPCInvalidRequestError(request.ID, fmt.Errorf("path %s is invalid", r.URL.Path)),
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)
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continue
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}
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rpcFunc, ok := funcMap[request.Method]
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if !ok || rpcFunc.ws {
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responses = append(responses, types.RPCMethodNotFoundError(request.ID))
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continue
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}
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ctx := &types.Context{JSONReq: &request, HTTPReq: r}
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args := []reflect.Value{reflect.ValueOf(ctx)}
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if len(request.Params) > 0 {
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fnArgs, err := jsonParamsToArgs(rpcFunc, request.Params)
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if err != nil {
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responses = append(
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responses,
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types.RPCInvalidParamsError(request.ID, fmt.Errorf("error converting json params to arguments: %w", err)),
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)
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continue
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}
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args = append(args, fnArgs...)
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}
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returns := rpcFunc.f.Call(args)
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logger.Debug("HTTPJSONRPC", "method", request.Method, "args", args, "returns", returns)
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result, err := unreflectResult(returns)
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switch e := err.(type) {
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// if no error then return a success response
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case nil:
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responses = append(responses, types.NewRPCSuccessResponse(request.ID, result))
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// if this already of type RPC error then forward that error
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case *types.RPCError:
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responses = append(responses, types.NewRPCErrorResponse(request.ID, e.Code, e.Message, e.Data))
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default: // we need to unwrap the error and parse it accordingly
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switch errors.Unwrap(err) {
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// check if the error was due to an invald request
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case ctypes.ErrZeroOrNegativeHeight, ctypes.ErrZeroOrNegativePerPage,
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ctypes.ErrPageOutOfRange, ctypes.ErrInvalidRequest:
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responses = append(responses, types.RPCInvalidRequestError(request.ID, err))
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// lastly default all remaining errors as internal errors
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default: // includes ctypes.ErrHeightNotAvailable and ctypes.ErrHeightExceedsChainHead
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responses = append(responses, types.RPCInternalError(request.ID, err))
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}
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}
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}
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if len(responses) > 0 {
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if wErr := WriteRPCResponseHTTP(w, responses...); wErr != nil {
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logger.Error("failed to write responses", "res", responses, "err", wErr)
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}
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}
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}
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}
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func handleInvalidJSONRPCPaths(next http.HandlerFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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// Since the pattern "/" matches all paths not matched by other registered patterns,
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// we check whether the path is indeed "/", otherwise return a 404 error
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if r.URL.Path != "/" {
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http.NotFound(w, r)
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return
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}
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next(w, r)
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}
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}
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func mapParamsToArgs(
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rpcFunc *RPCFunc,
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params map[string]json.RawMessage,
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argsOffset int,
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) ([]reflect.Value, error) {
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values := make([]reflect.Value, len(rpcFunc.argNames))
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for i, argName := range rpcFunc.argNames {
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argType := rpcFunc.args[i+argsOffset]
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if p, ok := params[argName]; ok && p != nil && len(p) > 0 {
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val := reflect.New(argType)
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err := tmjson.Unmarshal(p, val.Interface())
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if err != nil {
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return nil, err
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}
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values[i] = val.Elem()
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} else { // use default for that type
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values[i] = reflect.Zero(argType)
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}
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}
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return values, nil
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}
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func arrayParamsToArgs(
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rpcFunc *RPCFunc,
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params []json.RawMessage,
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argsOffset int,
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) ([]reflect.Value, error) {
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if len(rpcFunc.argNames) != len(params) {
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return nil, fmt.Errorf("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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argType := rpcFunc.args[i+argsOffset]
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val := reflect.New(argType)
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err := tmjson.Unmarshal(p, val.Interface())
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if err != nil {
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return nil, err
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}
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values[i] = val.Elem()
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}
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return values, nil
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}
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// raw is unparsed json (from json.RawMessage) encoding either a map or an
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// array.
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//
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// Example:
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// rpcFunc.args = [rpctypes.Context string]
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// rpcFunc.argNames = ["arg"]
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func jsonParamsToArgs(rpcFunc *RPCFunc, raw []byte) ([]reflect.Value, error) {
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const argsOffset = 1
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// TODO: Make more efficient, perhaps by checking the first character for '{' or '['?
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// First, try to get the map.
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var m map[string]json.RawMessage
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err := json.Unmarshal(raw, &m)
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if err == nil {
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return mapParamsToArgs(rpcFunc, m, argsOffset)
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}
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// Otherwise, try an array.
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var a []json.RawMessage
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err = json.Unmarshal(raw, &a)
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if err == nil {
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return arrayParamsToArgs(rpcFunc, a, argsOffset)
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}
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// Otherwise, bad format, we cannot parse
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return nil, fmt.Errorf("unknown type for JSON params: %v. Expected map or array", err)
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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("//%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("//%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 + "=_"
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if i < len(funcData.argNames)-1 {
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link += "&"
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}
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}
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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("</body></html>")
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w.Header().Set("Content-Type", "text/html")
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w.WriteHeader(200)
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w.Write(buf.Bytes()) // nolint: errcheck
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}
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