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package proxy
import (
"github.com/pkg/errors"
cmn "github.com/tendermint/tmlibs/common"
)
//-----------------------------
// Tendermint's interface to the application consists of multiple connections
type AppConns interface {
cmn.Service
Mempool() AppConnMempool
Consensus() AppConnConsensus
Query() AppConnQuery
}
func NewAppConns(clientCreator ClientCreator, handshaker Handshaker) AppConns {
return NewMultiAppConn(clientCreator, handshaker)
}
//-----------------------------
// multiAppConn implements AppConns
type Handshaker interface {
Handshake(AppConns) error
}
// a multiAppConn is made of a few appConns (mempool, consensus, query)
// and manages their underlying abci clients, including the handshake
// which ensures the app and tendermint are synced.
// TODO: on app restart, clients must reboot together
type multiAppConn struct {
cmn.BaseService
handshaker Handshaker
mempoolConn *appConnMempool
consensusConn *appConnConsensus
queryConn *appConnQuery
clientCreator ClientCreator
}
// Make all necessary abci connections to the application
func NewMultiAppConn(clientCreator ClientCreator, handshaker Handshaker) *multiAppConn {
multiAppConn := &multiAppConn{
handshaker: handshaker,
clientCreator: clientCreator,
}
multiAppConn.BaseService = *cmn.NewBaseService(nil, "multiAppConn", multiAppConn)
return multiAppConn
}
// Returns the mempool connection
func (app *multiAppConn) Mempool() AppConnMempool {
return app.mempoolConn
}
// Returns the consensus Connection
func (app *multiAppConn) Consensus() AppConnConsensus {
return app.consensusConn
}
// Returns the query Connection
func (app *multiAppConn) Query() AppConnQuery {
return app.queryConn
}
func (app *multiAppConn) OnStart() error {
// query connection
querycli, err := app.clientCreator.NewABCIClient()
if err != nil {
return errors.Wrap(err, "Error creating ABCI client (query connection)")
}
querycli.SetLogger(app.Logger.With("module", "abci-client", "connection", "query"))
if _, err := querycli.Start(); err != nil {
return errors.Wrap(err, "Error starting ABCI client (query connection)")
}
app.queryConn = NewAppConnQuery(querycli)
// mempool connection
memcli, err := app.clientCreator.NewABCIClient()
if err != nil {
return errors.Wrap(err, "Error creating ABCI client (mempool connection)")
}
memcli.SetLogger(app.Logger.With("module", "abci-client", "connection", "mempool"))
if _, err := memcli.Start(); err != nil {
return errors.Wrap(err, "Error starting ABCI client (mempool connection)")
}
app.mempoolConn = NewAppConnMempool(memcli)
// consensus connection
concli, err := app.clientCreator.NewABCIClient()
if err != nil {
return errors.Wrap(err, "Error creating ABCI client (consensus connection)")
}
concli.SetLogger(app.Logger.With("module", "abci-client", "connection", "consensus"))
if _, err := concli.Start(); err != nil {
return errors.Wrap(err, "Error starting ABCI client (consensus connection)")
}
app.consensusConn = NewAppConnConsensus(concli)
// ensure app is synced to the latest state
if app.handshaker != nil {
return app.handshaker.Handshake(app)
}
return nil
}