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harden(server): cap concurrent gRPC streams per connection #99

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Merged
0xHansLee merged 1 commit into from
Aug 7, 2026
Merged

harden(server): cap concurrent gRPC streams per connection #99

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7 changes: 7 additions & 0 deletions server/server.go
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Original file line number Diff line number Diff line change
Expand Up @@ -31,11 +31,18 @@ import (
"google.golang.org/grpc/status"
)

// maxConcurrentStreams bounds concurrent RPCs per client connection. The kernel serves a
// single co-located consensus client, so legitimate load stays far below this; the cap
// keeps a misbehaving peer from parking unbounded long-lived handlers (e.g. registration
// lag-retry waits).
const maxConcurrentStreams = 64

func Serve(cfg *config.Config) (*grpc.Server, chan error) {
errCh := make(chan error)

serverOpts := []grpc.ServerOption{
grpc.UnaryInterceptor(recoveryInterceptor()),
grpc.MaxConcurrentStreams(maxConcurrentStreams),
}

if cfg.GRPC.TLSEnabled() {
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