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Diffstat (limited to 'swarm/network/simulation/events.go')
| -rw-r--r-- | swarm/network/simulation/events.go | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/swarm/network/simulation/events.go b/swarm/network/simulation/events.go new file mode 100644 index 000000000..f9cfadb73 --- /dev/null +++ b/swarm/network/simulation/events.go @@ -0,0 +1,157 @@ +// Copyright 2018 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package simulation + +import ( + "context" + + "github.com/ethereum/go-ethereum/p2p/discover" + + "github.com/ethereum/go-ethereum/p2p" +) + +// PeerEvent is the type of the channel returned by Simulation.PeerEvents. +type PeerEvent struct { + // NodeID is the ID of node that the event is caught on. + NodeID discover.NodeID + // Event is the event that is caught. + Event *p2p.PeerEvent + // Error is the error that may have happened during event watching. + Error error +} + +// PeerEventsFilter defines a filter on PeerEvents to exclude messages with +// defined properties. Use PeerEventsFilter methods to set required options. +type PeerEventsFilter struct { + t *p2p.PeerEventType + protocol *string + msgCode *uint64 +} + +// NewPeerEventsFilter returns a new PeerEventsFilter instance. +func NewPeerEventsFilter() *PeerEventsFilter { + return &PeerEventsFilter{} +} + +// Type sets the filter to only one peer event type. +func (f *PeerEventsFilter) Type(t p2p.PeerEventType) *PeerEventsFilter { + f.t = &t + return f +} + +// Protocol sets the filter to only one message protocol. +func (f *PeerEventsFilter) Protocol(p string) *PeerEventsFilter { + f.protocol = &p + return f +} + +// MsgCode sets the filter to only one msg code. +func (f *PeerEventsFilter) MsgCode(c uint64) *PeerEventsFilter { + f.msgCode = &c + return f +} + +// PeerEvents returns a channel of events that are captured by admin peerEvents +// subscription nodes with provided NodeIDs. Additional filters can be set to ignore +// events that are not relevant. +func (s *Simulation) PeerEvents(ctx context.Context, ids []discover.NodeID, filters ...*PeerEventsFilter) <-chan PeerEvent { + eventC := make(chan PeerEvent) + + for _, id := range ids { + s.shutdownWG.Add(1) + go func(id discover.NodeID) { + defer s.shutdownWG.Done() + + client, err := s.Net.GetNode(id).Client() + if err != nil { + eventC <- PeerEvent{NodeID: id, Error: err} + return + } + events := make(chan *p2p.PeerEvent) + sub, err := client.Subscribe(ctx, "admin", events, "peerEvents") + if err != nil { + eventC <- PeerEvent{NodeID: id, Error: err} + return + } + defer sub.Unsubscribe() + + for { + select { + case <-ctx.Done(): + if err := ctx.Err(); err != nil { + select { + case eventC <- PeerEvent{NodeID: id, Error: err}: + case <-s.Done(): + } + } + return + case <-s.Done(): + return + case e := <-events: + match := len(filters) == 0 // if there are no filters match all events + for _, f := range filters { + if f.t != nil && *f.t != e.Type { + continue + } + if f.protocol != nil && *f.protocol != e.Protocol { + continue + } + if f.msgCode != nil && e.MsgCode != nil && *f.msgCode != *e.MsgCode { + continue + } + // all filter parameters matched, break the loop + match = true + break + } + if match { + select { + case eventC <- PeerEvent{NodeID: id, Event: e}: + case <-ctx.Done(): + if err := ctx.Err(); err != nil { + select { + case eventC <- PeerEvent{NodeID: id, Error: err}: + case <-s.Done(): + } + } + return + case <-s.Done(): + return + } + } + case err := <-sub.Err(): + if err != nil { + select { + case eventC <- PeerEvent{NodeID: id, Error: err}: + case <-ctx.Done(): + if err := ctx.Err(); err != nil { + select { + case eventC <- PeerEvent{NodeID: id, Error: err}: + case <-s.Done(): + } + } + return + case <-s.Done(): + return + } + } + } + } + }(id) + } + + return eventC +} |