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299 lines
8.5 KiB
299 lines
8.5 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"
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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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"github.com/tendermint/tendermint/rpc/coretypes"
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rpctypes "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, hreq *http.Request) {
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fail := func(res rpctypes.RPCResponse) {
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if err := WriteRPCResponseHTTPError(w, res); err != nil {
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logger.Error("Failed writing error response", "res", res, "err", err)
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}
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}
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// For POST requests, reject a non-root URL path. This should not happen
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// in the standard configuration, since the wrapper checks the path.
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if hreq.URL.Path != "/" {
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fail(rpctypes.RPCInvalidRequestError(nil, fmt.Errorf("invalid path: %q", hreq.URL.Path)))
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return
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}
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b, err := io.ReadAll(hreq.Body)
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if err != nil {
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fail(rpctypes.RPCInvalidRequestError(nil, fmt.Errorf("reading request body: %w", err)))
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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, hreq, funcMap)
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return
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}
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requests, err := parseRequests(b)
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if err != nil {
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fail(rpctypes.RPCParseError(fmt.Errorf("decoding request: %w", err)))
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return
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}
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// Set the default response cache to true unless
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// 1. Any RPC request rrror.
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// 2. Any RPC request doesn't allow to be cached.
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// 3. Any RPC request has the height argument and the value is 0 (the default).
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var responses []rpctypes.RPCResponse
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mayCache := true
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for _, req := range requests {
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// Ignore notifications, which this service does not support.
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if req.ID == nil {
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logger.Debug("Ignoring notification", "req", req)
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continue
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}
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rpcFunc, ok := funcMap[req.Method]
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if !ok || rpcFunc.ws {
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responses = append(responses, rpctypes.RPCMethodNotFoundError(req.ID))
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mayCache = false
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continue
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}
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if !rpcFunc.cache {
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mayCache = false
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}
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args, err := parseParams(rpcFunc, hreq, req)
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if err != nil {
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responses = append(responses, rpctypes.RPCInvalidParamsError(
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req.ID, fmt.Errorf("converting JSON parameters: %w", err)))
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mayCache = false
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continue
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}
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if hasDefaultHeight(req, args) {
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mayCache = false
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}
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returns := rpcFunc.f.Call(args)
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logger.Debug("HTTPJSONRPC", "method", req.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, rpctypes.NewRPCSuccessResponse(req.ID, result))
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// if this already of type RPC error then forward that error
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case *rpctypes.RPCError:
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responses = append(responses, rpctypes.NewRPCErrorResponse(req.ID, e.Code, e.Message, e.Data))
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mayCache = false
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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 coretypes.ErrZeroOrNegativeHeight, coretypes.ErrZeroOrNegativePerPage,
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coretypes.ErrPageOutOfRange, coretypes.ErrInvalidRequest:
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responses = append(responses, rpctypes.RPCInvalidRequestError(req.ID, err))
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mayCache = false
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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, rpctypes.RPCInternalError(req.ID, err))
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mayCache = false
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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, mayCache, responses...); wErr != nil {
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logger.Error("failed to write 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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// parseRequests parses a JSON-RPC request or request batch from data.
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func parseRequests(data []byte) ([]rpctypes.RPCRequest, error) {
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var reqs []rpctypes.RPCRequest
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var err error
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isArray := bytes.HasPrefix(bytes.TrimSpace(data), []byte("["))
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if isArray {
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err = json.Unmarshal(data, &reqs)
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} else {
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reqs = append(reqs, rpctypes.RPCRequest{})
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err = json.Unmarshal(data, &reqs[0])
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}
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if err != nil {
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return nil, err
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}
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return reqs, nil
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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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// parseParams parses the JSON parameters of rpcReq into the arguments of fn,
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// returning the corresponding argument values or an error.
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func parseParams(fn *RPCFunc, httpReq *http.Request, rpcReq rpctypes.RPCRequest) ([]reflect.Value, error) {
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ctx := rpctypes.WithCallInfo(httpReq.Context(), &rpctypes.CallInfo{
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RPCRequest: &rpcReq,
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HTTPRequest: httpReq,
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})
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args := []reflect.Value{reflect.ValueOf(ctx)}
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if len(rpcReq.Params) == 0 {
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return args, nil
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}
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fargs, err := jsonParamsToArgs(fn, rpcReq.Params)
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if err != nil {
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return nil, err
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}
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return append(args, fargs...), 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 = [context.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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func hasDefaultHeight(r rpctypes.RPCRequest, h []reflect.Value) bool {
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switch r.Method {
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case "block", "block_results", "commit", "consensus_params", "validators":
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return len(h) < 2 || h[1].IsZero()
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default:
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return false
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}
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}
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