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limit number of /subscribe clients and queries per client (#3269) * 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>
6 years ago
  1. package coregrpc
  2. import (
  3. "context"
  4. "net"
  5. "google.golang.org/grpc"
  6. tmnet "github.com/tendermint/tendermint/libs/net"
  7. "github.com/tendermint/tendermint/rpc/core"
  8. )
  9. // Config is an gRPC server configuration.
  10. type Config struct {
  11. MaxOpenConnections int
  12. }
  13. // StartGRPCServer starts a new gRPC BroadcastAPIServer using the given
  14. // net.Listener.
  15. // NOTE: This function blocks - you may want to call it in a go-routine.
  16. func StartGRPCServer(env *core.Environment, ln net.Listener) error {
  17. grpcServer := grpc.NewServer()
  18. RegisterBroadcastAPIServer(grpcServer, &broadcastAPI{env: env})
  19. return grpcServer.Serve(ln)
  20. }
  21. // StartGRPCClient dials the gRPC server using protoAddr and returns a new
  22. // BroadcastAPIClient.
  23. func StartGRPCClient(protoAddr string) BroadcastAPIClient {
  24. conn, err := grpc.Dial(protoAddr, grpc.WithInsecure(), grpc.WithContextDialer(dialerFunc))
  25. if err != nil {
  26. panic(err)
  27. }
  28. return NewBroadcastAPIClient(conn)
  29. }
  30. func dialerFunc(ctx context.Context, addr string) (net.Conn, error) {
  31. return tmnet.Connect(addr)
  32. }