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rpc: add support for batched requests/responses (#3534)

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Continues from #3280 in building support for batched requests/responses in the JSON RPC (as per issue #3213).

* Add JSON RPC batching for client and server

As per #3213, this adds support for [JSON RPC batch requests and
responses](https://www.jsonrpc.org/specification#batch).

* Add additional checks to ensure client responses are the same as results

* Fix case where a notification is sent and no response is expected

* Add test to check that JSON RPC notifications in a batch are left out in responses

* Update CHANGELOG_PENDING.md

* Update PR number now that PR has been created

* Make errors start with lowercase letter

* Refactor batch functionality to be standalone

This refactors the batching functionality to rather act in a standalone
way. In light of supporting concurrent goroutines making use of the same
client, it would make sense to have batching functionality where one
could create a batch of requests per goroutine and send that batch
without interfering with a batch from another goroutine.

* Add examples for simple and batch HTTP client usage

* Check errors from writer and remove nolinter directives

* Make error strings start with lowercase letter

* Refactor examples to make them testable

* Use safer deferred shutdown for example Tendermint test node

* Recompose rpcClient interface from pre-existing interface components

* Rename WaitGroup for brevity

* Replace empty ID string with request ID

* Remove extraneous test case

* Convert first letter of errors.Wrap() messages to lowercase

* Remove extraneous function parameter

* Make variable declaration terse

* Reorder WaitGroup.Done call to help prevent race conditions in the face of failure

* Swap mutex to value representation and remove initialization

* Restore empty JSONRPC string ID in response to prevent nil

* Make JSONRPCBufferedRequest private

* Revert PR hard link in CHANGELOG_PENDING

* Add client ID for JSONRPCClient

This adds code to automatically generate a randomized client ID for the
JSONRPCClient, and adds a check of the IDs in the responses (if one was
set in the requests).

* Extract response ID validation into separate function

* Remove extraneous comments

* Reorder fields to indicate clearly which are protected by the mutex

* Refactor for loop to remove indexing

* Restructure and combine loop

* Flatten conditional block for better readability

* Make multi-variable declaration slightly more readable

* Change for loop style

* Compress error check statements

* Make function description more generic to show that we support different protocols

* Preallocate memory for request and result objects
This commit is contained in:
Thane Thomson
2019-04-17 11:10:12 -04:00
committed by Anton Kaliaev
parent 621c0e629d
commit 90465f727f
11 changed files with 747 additions and 133 deletions
Download Patch File Download Diff File Expand all files Collapse all files

100
rpc/lib/server/handlers.go
View File

@ -103,7 +103,7 @@ func makeJSONRPCHandler(funcMap map[string]*RPCFunc, cdc *amino.Codec, logger lo
return func(w http.ResponseWriter, r *http.Request) {
b, err := ioutil.ReadAll(r.Body)
if err != nil {
WriteRPCResponseHTTP(w, types.RPCInvalidRequestError(types.JSONRPCStringID(""), errors.Wrap(err, "Error reading request body")))
WriteRPCResponseHTTP(w, types.RPCInvalidRequestError(types.JSONRPCStringID(""), errors.Wrap(err, "error reading request body")))
return
}
// if its an empty request (like from a browser),
@ -113,49 +113,59 @@ func makeJSONRPCHandler(funcMap map[string]*RPCFunc, cdc *amino.Codec, logger lo
return
}
var request types.RPCRequest
err = json.Unmarshal(b, &request)
if err != nil {
WriteRPCResponseHTTP(w, types.RPCParseError(types.JSONRPCStringID(""), errors.Wrap(err, "Error unmarshalling request")))
return
}
// A Notification is a Request object without an "id" member.
// The Server MUST NOT reply to a Notification, including those that are within a batch request.
if request.ID == types.JSONRPCStringID("") {
logger.Debug("HTTPJSONRPC received a notification, skipping... (please send a non-empty ID if you want to call a method)")
return
}
if len(r.URL.Path) > 1 {
WriteRPCResponseHTTP(w, types.RPCInvalidRequestError(request.ID, errors.Errorf("Path %s is invalid", r.URL.Path)))
return
}
rpcFunc := funcMap[request.Method]
if rpcFunc == nil || rpcFunc.ws {
WriteRPCResponseHTTP(w, types.RPCMethodNotFoundError(request.ID))
return
}
ctx := &types.Context{JSONReq: &request, HTTPReq: r}
args := []reflect.Value{reflect.ValueOf(ctx)}
if len(request.Params) > 0 {
fnArgs, err := jsonParamsToArgs(rpcFunc, cdc, request.Params)
if err != nil {
WriteRPCResponseHTTP(w, types.RPCInvalidParamsError(request.ID, errors.Wrap(err, "Error converting json params to arguments")))
// first try to unmarshal the incoming request as an array of RPC requests
var (
requests []types.RPCRequest
responses []types.RPCResponse
)
if err := json.Unmarshal(b, &requests); err != nil {
// next, try to unmarshal as a single request
var request types.RPCRequest
if err := json.Unmarshal(b, &request); err != nil {
WriteRPCResponseHTTP(w, types.RPCParseError(types.JSONRPCStringID(""), errors.Wrap(err, "error unmarshalling request")))
return
}
args = append(args, fnArgs...)
requests = []types.RPCRequest{request}
}
returns := rpcFunc.f.Call(args)
logger.Info("HTTPJSONRPC", "method", request.Method, "args", args, "returns", returns)
result, err := unreflectResult(returns)
if err != nil {
WriteRPCResponseHTTP(w, types.RPCInternalError(request.ID, err))
return
for _, request := range requests {
// A Notification is a Request object without an "id" member.
// The Server MUST NOT reply to a Notification, including those that are within a batch request.
if request.ID == types.JSONRPCStringID("") {
logger.Debug("HTTPJSONRPC received a notification, skipping... (please send a non-empty ID if you want to call a method)")
continue
}
if len(r.URL.Path) > 1 {
responses = append(responses, types.RPCInvalidRequestError(request.ID, errors.Errorf("path %s is invalid", r.URL.Path)))
continue
}
rpcFunc, ok := funcMap[request.Method]
if !ok || rpcFunc.ws {
responses = append(responses, types.RPCMethodNotFoundError(request.ID))
continue
}
ctx := &types.Context{JSONReq: &request, HTTPReq: r}
args := []reflect.Value{reflect.ValueOf(ctx)}
if len(request.Params) > 0 {
fnArgs, err := jsonParamsToArgs(rpcFunc, cdc, request.Params)
if err != nil {
responses = append(responses, types.RPCInvalidParamsError(request.ID, errors.Wrap(err, "error converting json params to arguments")))
continue
}
args = append(args, fnArgs...)
}
returns := rpcFunc.f.Call(args)
logger.Info("HTTPJSONRPC", "method", request.Method, "args", args, "returns", returns)
result, err := unreflectResult(returns)
if err != nil {
responses = append(responses, types.RPCInternalError(request.ID, err))
continue
}
responses = append(responses, types.NewRPCSuccessResponse(cdc, request.ID, result))
}
if len(responses) > 0 {
WriteRPCResponseArrayHTTP(w, responses)
}
WriteRPCResponseHTTP(w, types.NewRPCSuccessResponse(cdc, request.ID, result))
}
}
@ -194,7 +204,7 @@ func mapParamsToArgs(rpcFunc *RPCFunc, cdc *amino.Codec, params map[string]json.
func arrayParamsToArgs(rpcFunc *RPCFunc, cdc *amino.Codec, params []json.RawMessage, argsOffset int) ([]reflect.Value, error) {
if len(rpcFunc.argNames) != len(params) {
return nil, errors.Errorf("Expected %v parameters (%v), got %v (%v)",
return nil, errors.Errorf("expected %v parameters (%v), got %v (%v)",
len(rpcFunc.argNames), rpcFunc.argNames, len(params), params)
}
@ -236,7 +246,7 @@ func jsonParamsToArgs(rpcFunc *RPCFunc, cdc *amino.Codec, raw []byte) ([]reflect
}
// Otherwise, bad format, we cannot parse
return nil, errors.Errorf("Unknown type for JSON params: %v. Expected map or array", err)
return nil, errors.Errorf("unknown type for JSON params: %v. Expected map or array", err)
}
// rpc.json
@ -261,7 +271,7 @@ func makeHTTPHandler(rpcFunc *RPCFunc, cdc *amino.Codec, logger log.Logger) func
fnArgs, err := httpParamsToArgs(rpcFunc, cdc, r)
if err != nil {
WriteRPCResponseHTTP(w, types.RPCInvalidParamsError(types.JSONRPCStringID(""), errors.Wrap(err, "Error converting http params to arguments")))
WriteRPCResponseHTTP(w, types.RPCInvalidParamsError(types.JSONRPCStringID(""), errors.Wrap(err, "error converting http params to arguments")))
return
}
args = append(args, fnArgs...)
@ -372,7 +382,7 @@ func _nonJSONStringToArg(cdc *amino.Codec, rt reflect.Type, arg string) (reflect
if isHexString {
if !expectingString && !expectingByteSlice {
err := errors.Errorf("Got a hex string arg, but expected '%s'",
err := errors.Errorf("got a hex string arg, but expected '%s'",
rt.Kind().String())
return reflect.ValueOf(nil), err, false
}
@ -631,7 +641,7 @@ func (wsc *wsConnection) readRoutine() {
var request types.RPCRequest
err = json.Unmarshal(in, &request)
if err != nil {
wsc.WriteRPCResponse(types.RPCParseError(types.JSONRPCStringID(""), errors.Wrap(err, "Error unmarshaling request")))
wsc.WriteRPCResponse(types.RPCParseError(types.JSONRPCStringID(""), errors.Wrap(err, "error unmarshaling request")))
continue
}
@ -654,7 +664,7 @@ func (wsc *wsConnection) readRoutine() {
if len(request.Params) > 0 {
fnArgs, err := jsonParamsToArgs(rpcFunc, wsc.cdc, request.Params)
if err != nil {
wsc.WriteRPCResponse(types.RPCInternalError(request.ID, errors.Wrap(err, "Error converting json params to arguments")))
wsc.WriteRPCResponse(types.RPCInternalError(request.ID, errors.Wrap(err, "error converting json params to arguments")))
continue
}
args = append(args, fnArgs...)