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200 lines
5.0 KiB
200 lines
5.0 KiB
package proxy
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import (
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"fmt"
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"os"
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"syscall"
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abcicli "github.com/tendermint/tendermint/abci/client"
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tmlog "github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/libs/service"
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)
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const (
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connConsensus = "consensus"
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connMempool = "mempool"
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connQuery = "query"
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connSnapshot = "snapshot"
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)
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// AppConns is the Tendermint's interface to the application that consists of
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// multiple connections.
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type AppConns interface {
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service.Service
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// Mempool connection
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Mempool() AppConnMempool
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// Consensus connection
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Consensus() AppConnConsensus
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// Query connection
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Query() AppConnQuery
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// Snapshot connection
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Snapshot() AppConnSnapshot
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}
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// NewAppConns calls NewMultiAppConn.
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func NewAppConns(clientCreator ClientCreator) AppConns {
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return NewMultiAppConn(clientCreator)
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}
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// multiAppConn implements AppConns.
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//
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// A multiAppConn is made of a few appConns and manages their underlying abci
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// clients.
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// TODO: on app restart, clients must reboot together
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type multiAppConn struct {
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service.BaseService
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consensusConn AppConnConsensus
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mempoolConn AppConnMempool
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queryConn AppConnQuery
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snapshotConn AppConnSnapshot
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consensusConnClient abcicli.Client
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mempoolConnClient abcicli.Client
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queryConnClient abcicli.Client
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snapshotConnClient abcicli.Client
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clientCreator ClientCreator
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}
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// NewMultiAppConn makes all necessary abci connections to the application.
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func NewMultiAppConn(clientCreator ClientCreator) AppConns {
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multiAppConn := &multiAppConn{
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clientCreator: clientCreator,
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}
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multiAppConn.BaseService = *service.NewBaseService(nil, "multiAppConn", multiAppConn)
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return multiAppConn
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}
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func (app *multiAppConn) Mempool() AppConnMempool {
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return app.mempoolConn
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}
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func (app *multiAppConn) Consensus() AppConnConsensus {
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return app.consensusConn
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}
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func (app *multiAppConn) Query() AppConnQuery {
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return app.queryConn
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}
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func (app *multiAppConn) Snapshot() AppConnSnapshot {
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return app.snapshotConn
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}
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func (app *multiAppConn) OnStart() error {
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c, err := app.abciClientFor(connQuery)
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if err != nil {
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return err
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}
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app.queryConnClient = c
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app.queryConn = NewAppConnQuery(c)
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c, err = app.abciClientFor(connSnapshot)
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if err != nil {
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app.stopAllClients()
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return err
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}
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app.snapshotConnClient = c
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app.snapshotConn = NewAppConnSnapshot(c)
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c, err = app.abciClientFor(connMempool)
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if err != nil {
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app.stopAllClients()
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return err
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}
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app.mempoolConnClient = c
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app.mempoolConn = NewAppConnMempool(c)
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c, err = app.abciClientFor(connConsensus)
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if err != nil {
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app.stopAllClients()
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return err
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}
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app.consensusConnClient = c
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app.consensusConn = NewAppConnConsensus(c)
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// Kill Tendermint if the ABCI application crashes.
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go app.killTMOnClientError()
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return nil
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}
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func (app *multiAppConn) OnStop() {
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app.stopAllClients()
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}
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func (app *multiAppConn) killTMOnClientError() {
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killFn := func(conn string, err error, logger tmlog.Logger) {
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logger.Error(
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fmt.Sprintf("%s connection terminated. Did the application crash? Please restart tendermint", conn),
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"err", err)
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if killErr := kill(); killErr != nil {
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logger.Error("Failed to kill this process - please do so manually", "err", killErr)
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}
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}
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select {
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case <-app.consensusConnClient.Quit():
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if err := app.consensusConnClient.Error(); err != nil {
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killFn(connConsensus, err, app.Logger)
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}
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case <-app.mempoolConnClient.Quit():
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if err := app.mempoolConnClient.Error(); err != nil {
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killFn(connMempool, err, app.Logger)
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}
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case <-app.queryConnClient.Quit():
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if err := app.queryConnClient.Error(); err != nil {
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killFn(connQuery, err, app.Logger)
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}
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case <-app.snapshotConnClient.Quit():
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if err := app.snapshotConnClient.Error(); err != nil {
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killFn(connSnapshot, err, app.Logger)
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}
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}
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}
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func (app *multiAppConn) stopAllClients() {
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if app.consensusConnClient != nil {
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if err := app.consensusConnClient.Stop(); err != nil {
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app.Logger.Error("error while stopping consensus client", "error", err)
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}
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}
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if app.mempoolConnClient != nil {
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if err := app.mempoolConnClient.Stop(); err != nil {
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app.Logger.Error("error while stopping mempool client", "error", err)
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}
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}
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if app.queryConnClient != nil {
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if err := app.queryConnClient.Stop(); err != nil {
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app.Logger.Error("error while stopping query client", "error", err)
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}
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}
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if app.snapshotConnClient != nil {
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if err := app.snapshotConnClient.Stop(); err != nil {
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app.Logger.Error("error while stopping snapshot client", "error", err)
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}
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}
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}
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func (app *multiAppConn) abciClientFor(conn string) (abcicli.Client, error) {
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c, err := app.clientCreator.NewABCIClient()
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if err != nil {
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return nil, fmt.Errorf("error creating ABCI client (%s connection): %w", conn, err)
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}
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c.SetLogger(app.Logger.With("module", "abci-client", "connection", conn))
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if err := c.Start(); err != nil {
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return nil, fmt.Errorf("error starting ABCI client (%s connection): %w", conn, err)
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}
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return c, nil
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}
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func kill() error {
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p, err := os.FindProcess(os.Getpid())
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if err != nil {
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return err
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}
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return p.Signal(syscall.SIGTERM)
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}
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