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243 lines
6.2 KiB
243 lines
6.2 KiB
package proxy
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import (
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"context"
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"errors"
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"fmt"
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"os"
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"syscall"
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abciclient "github.com/tendermint/tendermint/abci/client"
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"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 abciclient.Creator, logger log.Logger, metrics *Metrics) AppConns {
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return NewMultiAppConn(clientCreator, logger, metrics)
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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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logger log.Logger
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metrics *Metrics
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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 stoppableClient
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mempoolConnClient stoppableClient
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queryConnClient stoppableClient
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snapshotConnClient stoppableClient
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clientCreator abciclient.Creator
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}
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// TODO: this is a totally internal and quasi permanent shim for
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// clients. eventually we can have a single client and have some kind
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// of reasonable lifecycle witout needing an explicit stop method.
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type stoppableClient interface {
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abciclient.Client
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Stop() error
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}
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// NewMultiAppConn makes all necessary abci connections to the application.
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func NewMultiAppConn(clientCreator abciclient.Creator, logger log.Logger, metrics *Metrics) AppConns {
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multiAppConn := &multiAppConn{
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logger: logger,
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metrics: metrics,
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clientCreator: clientCreator,
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}
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multiAppConn.BaseService = *service.NewBaseService(logger, "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(ctx context.Context) error {
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c, err := app.abciClientFor(ctx, 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.(stoppableClient)
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app.queryConn = NewAppConnQuery(c, app.metrics)
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c, err = app.abciClientFor(ctx, 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.(stoppableClient)
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app.snapshotConn = NewAppConnSnapshot(c, app.metrics)
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c, err = app.abciClientFor(ctx, 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.(stoppableClient)
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app.mempoolConn = NewAppConnMempool(c, app.metrics)
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c, err = app.abciClientFor(ctx, 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.(stoppableClient)
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app.consensusConn = NewAppConnConsensus(c, app.metrics)
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// Kill Tendermint if the ABCI application crashes.
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app.startWatchersForClientErrorToKillTendermint(ctx)
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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) startWatchersForClientErrorToKillTendermint(ctx context.Context) {
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// this function starts a number of threads (per abci client)
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// that will SIGTERM's our own PID if any of the ABCI clients
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// exit/return early. If the context is canceled then these
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// functions will not kill tendermint.
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killFn := func(conn string, err error, logger log.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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type op struct {
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connClient stoppableClient
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name string
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}
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for _, client := range []op{
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{
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connClient: app.consensusConnClient,
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name: connConsensus,
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},
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{
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connClient: app.mempoolConnClient,
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name: connMempool,
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},
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{
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connClient: app.queryConnClient,
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name: connQuery,
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},
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{
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connClient: app.snapshotConnClient,
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name: connSnapshot,
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},
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} {
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go func(name string, client stoppableClient) {
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client.Wait()
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if ctx.Err() != nil {
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return
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}
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if err := client.Error(); err != nil {
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killFn(name, err, app.logger)
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}
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}(client.name, client.connClient)
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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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if !errors.Is(err, service.ErrAlreadyStopped) {
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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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}
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if app.mempoolConnClient != nil {
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if err := app.mempoolConnClient.Stop(); err != nil {
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if !errors.Is(err, service.ErrAlreadyStopped) {
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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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}
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if app.queryConnClient != nil {
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if err := app.queryConnClient.Stop(); err != nil {
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if !errors.Is(err, service.ErrAlreadyStopped) {
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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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}
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if app.snapshotConnClient != nil {
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if err := app.snapshotConnClient.Stop(); err != nil {
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if !errors.Is(err, service.ErrAlreadyStopped) {
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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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}
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func (app *multiAppConn) abciClientFor(ctx context.Context, conn string) (abciclient.Client, error) {
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c, err := app.clientCreator(app.logger.With(
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"module", "abci-client",
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"connection", conn))
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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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if err := c.Start(ctx); 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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