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limit number of /subscribe clients and queries per client (#3269)

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* limit number of /subscribe clients and queries per client

Add the following config variables (under [rpc] section):
  * max_subscription_clients
  * max_subscriptions_per_client
  * timeout_broadcast_tx_commit

Fixes #2826

new HTTPClient interface for subscriptions

finalize HTTPClient events interface

remove EventSubscriber

fix data race

```
WARNING: DATA RACE
Read at 0x00c000a36060 by goroutine 129:
  github.com/tendermint/tendermint/rpc/client.(*Local).Subscribe.func1()
      /go/src/github.com/tendermint/tendermint/rpc/client/localclient.go:168 +0x1f0

Previous write at 0x00c000a36060 by goroutine 132:
  github.com/tendermint/tendermint/rpc/client.(*Local).Subscribe()
      /go/src/github.com/tendermint/tendermint/rpc/client/localclient.go:191 +0x4e0
  github.com/tendermint/tendermint/rpc/client.WaitForOneEvent()
      /go/src/github.com/tendermint/tendermint/rpc/client/helpers.go:64 +0x178
  github.com/tendermint/tendermint/rpc/client_test.TestTxEventsSentWithBroadcastTxSync.func1()
      /go/src/github.com/tendermint/tendermint/rpc/client/event_test.go:139 +0x298
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:827 +0x162

Goroutine 129 (running) created at:
  github.com/tendermint/tendermint/rpc/client.(*Local).Subscribe()
      /go/src/github.com/tendermint/tendermint/rpc/client/localclient.go:164 +0x4b7
  github.com/tendermint/tendermint/rpc/client.WaitForOneEvent()
      /go/src/github.com/tendermint/tendermint/rpc/client/helpers.go:64 +0x178
  github.com/tendermint/tendermint/rpc/client_test.TestTxEventsSentWithBroadcastTxSync.func1()
      /go/src/github.com/tendermint/tendermint/rpc/client/event_test.go:139 +0x298
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:827 +0x162

Goroutine 132 (running) created at:
  testing.(*T).Run()
      /usr/local/go/src/testing/testing.go:878 +0x659
  github.com/tendermint/tendermint/rpc/client_test.TestTxEventsSentWithBroadcastTxSync()
      /go/src/github.com/tendermint/tendermint/rpc/client/event_test.go:119 +0x186
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:827 +0x162
==================
```

lite client works (tested manually)

godoc comments

httpclient: do not close the out channel

use TimeoutBroadcastTxCommit

no timeout for unsubscribe

but 1s Local (5s HTTP) timeout for resubscribe

format code

change Subscribe#out cap to 1

and replace config vars with RPCConfig

TimeoutBroadcastTxCommit can't be greater than rpcserver.WriteTimeout

rpc: Context as first parameter to all functions

reformat code

fixes after my own review

fixes after Ethan's review

add test stubs

fix config.toml

* fixes after manual testing

- rpc: do not recommend to use BroadcastTxCommit because it's slow and wastes
Tendermint resources (pubsub)
- rpc: better error in Subscribe and BroadcastTxCommit
- HTTPClient: do not resubscribe if err = ErrAlreadySubscribed

* fixes after Ismail's review

* Update rpc/grpc/grpc_test.go

Co-Authored-By: melekes <anton.kalyaev@gmail.com>
This commit is contained in:
Anton Kaliaev
2019-03-11 22:45:58 +04:00
committed by GitHub
parent 15f621141d
commit d741c7b478
36 changed files with 657 additions and 350 deletions
Download Patch File Download Diff File Expand all files Collapse all files

97
rpc/lib/server/handlers.go
View File

@ -2,7 +2,6 @@ package rpcserver
import (
"bytes"
"context"
"encoding/hex"
"encoding/json"
"fmt"
@ -129,20 +128,26 @@ func makeJSONRPCHandler(funcMap map[string]*RPCFunc, cdc *amino.Codec, logger lo
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
}
var args []reflect.Value
ctx := &types.Context{JSONReq: &request, HTTPReq: r}
args := []reflect.Value{reflect.ValueOf(ctx)}
if len(request.Params) > 0 {
args, err = jsonParamsToArgsRPC(rpcFunc, cdc, request.Params)
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")))
return
}
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 {
@ -205,13 +210,14 @@ func arrayParamsToArgs(rpcFunc *RPCFunc, cdc *amino.Codec, params []json.RawMess
return values, nil
}
// `raw` is unparsed json (from json.RawMessage) encoding either a map or an array.
// `argsOffset` should be 0 for RPC calls, and 1 for WS requests, where len(rpcFunc.args) != len(rpcFunc.argNames).
// raw is unparsed json (from json.RawMessage) encoding either a map or an
// array.
//
// Example:
// rpcFunc.args = [rpctypes.WSRPCContext string]
// rpcFunc.args = [rpctypes.Context string]
// rpcFunc.argNames = ["arg"]
func jsonParamsToArgs(rpcFunc *RPCFunc, cdc *amino.Codec, raw []byte, argsOffset int) ([]reflect.Value, error) {
func jsonParamsToArgs(rpcFunc *RPCFunc, cdc *amino.Codec, raw []byte) ([]reflect.Value, error) {
const argsOffset = 1
// TODO: Make more efficient, perhaps by checking the first character for '{' or '['?
// First, try to get the map.
@ -232,20 +238,6 @@ func jsonParamsToArgs(rpcFunc *RPCFunc, cdc *amino.Codec, raw []byte, argsOffset
return nil, errors.Errorf("Unknown type for JSON params: %v. Expected map or array", err)
}
// Convert a []interface{} OR a map[string]interface{} to properly typed values
func jsonParamsToArgsRPC(rpcFunc *RPCFunc, cdc *amino.Codec, params json.RawMessage) ([]reflect.Value, error) {
return jsonParamsToArgs(rpcFunc, cdc, params, 0)
}
// Same as above, but with the first param the websocket connection
func jsonParamsToArgsWS(rpcFunc *RPCFunc, cdc *amino.Codec, params json.RawMessage, wsCtx types.WSRPCContext) ([]reflect.Value, error) {
values, err := jsonParamsToArgs(rpcFunc, cdc, params, 1)
if err != nil {
return nil, err
}
return append([]reflect.Value{reflect.ValueOf(wsCtx)}, values...), nil
}
// rpc.json
//-----------------------------------------------------------------------------
// rpc.http
@ -258,15 +250,23 @@ func makeHTTPHandler(rpcFunc *RPCFunc, cdc *amino.Codec, logger log.Logger) func
WriteRPCResponseHTTP(w, types.RPCMethodNotFoundError(types.JSONRPCStringID("")))
}
}
// All other endpoints
return func(w http.ResponseWriter, r *http.Request) {
logger.Debug("HTTP HANDLER", "req", r)
args, err := httpParamsToArgs(rpcFunc, cdc, r)
ctx := &types.Context{HTTPReq: r}
args := []reflect.Value{reflect.ValueOf(ctx)}
fnArgs, err := httpParamsToArgs(rpcFunc, cdc, r)
if err != nil {
WriteRPCResponseHTTP(w, types.RPCInvalidParamsError(types.JSONRPCStringID(""), errors.Wrap(err, "Error converting http params to arguments")))
return
}
args = append(args, fnArgs...)
returns := rpcFunc.f.Call(args)
logger.Info("HTTPRestRPC", "method", r.URL.Path, "args", args, "returns", returns)
result, err := unreflectResult(returns)
if err != nil {
@ -280,10 +280,13 @@ func makeHTTPHandler(rpcFunc *RPCFunc, cdc *amino.Codec, logger log.Logger) func
// Covert an http query to a list of properly typed values.
// To be properly decoded the arg must be a concrete type from tendermint (if its an interface).
func httpParamsToArgs(rpcFunc *RPCFunc, cdc *amino.Codec, r *http.Request) ([]reflect.Value, error) {
values := make([]reflect.Value, len(rpcFunc.args))
// skip types.Context
const argsOffset = 1
values := make([]reflect.Value, len(rpcFunc.argNames))
for i, name := range rpcFunc.argNames {
argType := rpcFunc.args[i]
argType := rpcFunc.args[i+argsOffset]
values[i] = reflect.Zero(argType) // set default for that type
@ -434,8 +437,8 @@ type wsConnection struct {
// Send pings to server with this period. Must be less than readWait, but greater than zero.
pingPeriod time.Duration
// object that is used to subscribe / unsubscribe from events
eventSub types.EventSubscriber
// callback which is called upon disconnect
onDisconnect func(remoteAddr string)
}
// NewWSConnection wraps websocket.Conn.
@ -468,12 +471,11 @@ func NewWSConnection(
return wsc
}
// EventSubscriber sets object that is used to subscribe / unsubscribe from
// events - not Goroutine-safe. If none given, default node's eventBus will be
// used.
func EventSubscriber(eventSub types.EventSubscriber) func(*wsConnection) {
// OnDisconnect sets a callback which is used upon disconnect - not
// Goroutine-safe. Nop by default.
func OnDisconnect(onDisconnect func(remoteAddr string)) func(*wsConnection) {
return func(wsc *wsConnection) {
wsc.eventSub = eventSub
wsc.onDisconnect = onDisconnect
}
}
@ -527,8 +529,8 @@ func (wsc *wsConnection) OnStop() {
// Both read and write loops close the websocket connection when they exit their loops.
// The writeChan is never closed, to allow WriteRPCResponse() to fail.
if wsc.eventSub != nil {
wsc.eventSub.UnsubscribeAll(context.TODO(), wsc.remoteAddr)
if wsc.onDisconnect != nil {
wsc.onDisconnect(wsc.remoteAddr)
}
}
@ -538,11 +540,6 @@ func (wsc *wsConnection) GetRemoteAddr() string {
return wsc.remoteAddr
}
// GetEventSubscriber implements WSRPCConnection by returning event subscriber.
func (wsc *wsConnection) GetEventSubscriber() types.EventSubscriber {
return wsc.eventSub
}
// WriteRPCResponse pushes a response to the writeChan, and blocks until it is accepted.
// It implements WSRPCConnection. It is Goroutine-safe.
func (wsc *wsConnection) WriteRPCResponse(resp types.RPCResponse) {
@ -628,27 +625,23 @@ func (wsc *wsConnection) readRoutine() {
}
// Now, fetch the RPCFunc and execute it.
rpcFunc := wsc.funcMap[request.Method]
if rpcFunc == nil {
wsc.WriteRPCResponse(types.RPCMethodNotFoundError(request.ID))
continue
}
var args []reflect.Value
if rpcFunc.ws {
wsCtx := types.WSRPCContext{Request: request, WSRPCConnection: wsc}
if len(request.Params) > 0 {
args, err = jsonParamsToArgsWS(rpcFunc, wsc.cdc, request.Params, wsCtx)
}
} else {
if len(request.Params) > 0 {
args, err = jsonParamsToArgsRPC(rpcFunc, wsc.cdc, request.Params)
ctx := &types.Context{JSONReq: &request, WSConn: wsc}
args := []reflect.Value{reflect.ValueOf(ctx)}
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")))
continue
}
args = append(args, fnArgs...)
}
if err != nil {
wsc.WriteRPCResponse(types.RPCInternalError(request.ID, errors.Wrap(err, "Error converting json params to arguments")))
continue
}
returns := rpcFunc.f.Call(args)
// TODO: Need to encode args/returns to string if we want to log them