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chainipc.go
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chainipc.go
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// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package ipcs
import (
"fmt"
"path/filepath"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/snow/triggers"
"github.com/ava-labs/avalanchego/utils/logging"
"github.com/ava-labs/avalanchego/utils/wrappers"
)
const (
// DefaultBaseURL can be used as a reasonable default value for the base URL
DefaultBaseURL = "/tmp"
ipcIdentifierPrefix = "ipc"
ipcConsensusIdentifier = "consensus"
ipcDecisionsIdentifier = "decisions"
)
type context struct {
log logging.Logger
networkID uint32
path string
}
// ChainIPCs maintains IPCs for a set of chains
type ChainIPCs struct {
context
chains map[ids.ID]*EventSockets
consensusEvents *triggers.EventDispatcher
decisionEvents *triggers.EventDispatcher
}
// NewChainIPCs creates a new *ChainIPCs that writes consensus and decision
// events to IPC sockets
func NewChainIPCs(log logging.Logger, path string, networkID uint32, consensusEvents *triggers.EventDispatcher, decisionEvents *triggers.EventDispatcher, defaultChainIDs []ids.ID) (*ChainIPCs, error) {
cipcs := &ChainIPCs{
context: context{
log: log,
networkID: networkID,
path: path,
},
chains: make(map[ids.ID]*EventSockets),
consensusEvents: consensusEvents,
decisionEvents: decisionEvents,
}
for _, chainID := range defaultChainIDs {
if _, err := cipcs.Publish(chainID); err != nil {
return nil, err
}
}
return cipcs, nil
}
// Publish creates a set of eventSockets for the given chainID
func (cipcs *ChainIPCs) Publish(chainID ids.ID) (*EventSockets, error) {
if es, ok := cipcs.chains[chainID]; ok {
cipcs.log.Info("returning existing blockchainID %s", chainID.String())
return es, nil
}
es, err := newEventSockets(cipcs.context, chainID, cipcs.consensusEvents, cipcs.decisionEvents)
if err != nil {
cipcs.log.Error("can't create ipcs: %s", err)
return nil, err
}
cipcs.chains[chainID] = es
cipcs.log.Info("created IPC sockets for blockchain %s at %s and %s", chainID.String(), es.ConsensusURL(), es.DecisionsURL())
return es, nil
}
// Unpublish stops the eventSocket for the given chain if it exists. It returns
// whether or not the socket existed and errors when trying to close it
func (cipcs *ChainIPCs) Unpublish(chainID ids.ID) (bool, error) {
chainIPCs, ok := cipcs.chains[chainID]
if !ok {
return false, nil
}
delete(cipcs.chains, chainID)
return true, chainIPCs.stop()
}
// GetPublishedBlockchains returns the chains that are currently being published
func (cipcs *ChainIPCs) GetPublishedBlockchains() []ids.ID {
chainIds := make([]ids.ID, 0, len(cipcs.chains))
for id := range cipcs.chains {
chainIds = append(chainIds, id)
}
return chainIds
}
func (cipcs *ChainIPCs) Shutdown() error {
cipcs.log.Info("shutting down chain IPCs")
errs := wrappers.Errs{}
for _, ch := range cipcs.chains {
errs.Add(ch.stop())
}
return errs.Err
}
func ipcURL(ctx context, chainID ids.ID, eventType string) string {
return filepath.Join(ctx.path, fmt.Sprintf("%d-%s-%s", ctx.networkID, chainID.String(), eventType))
}