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package proxy
import (
"fmt"
"io"
abcicli "github.com/tendermint/tendermint/abci/client"
"github.com/tendermint/tendermint/abci/example/counter"
"github.com/tendermint/tendermint/abci/example/kvstore"
"github.com/tendermint/tendermint/abci/types"
tmsync "github.com/tendermint/tendermint/libs/sync"
)
// ClientCreator creates new ABCI clients.
type ClientCreator interface {
// NewABCIClient returns a new ABCI client.
NewABCIClient() (abcicli.Client, error)
}
//----------------------------------------------------
// local proxy uses a mutex on an in-proc app
type localClientCreator struct {
mtx *tmsync.RWMutex
app types.Application
}
// NewLocalClientCreator returns a ClientCreator for the given app,
// which will be running locally.
func NewLocalClientCreator(app types.Application) ClientCreator {
return &localClientCreator{
mtx: new(tmsync.RWMutex),
app: app,
}
}
func (l *localClientCreator) NewABCIClient() (abcicli.Client, error) {
return abcicli.NewLocalClient(l.mtx, l.app), nil
}
//---------------------------------------------------------------
// remote proxy opens new connections to an external app process
type remoteClientCreator struct {
addr string
transport string
mustConnect bool
}
// NewRemoteClientCreator returns a ClientCreator for the given address (e.g.
// "192.168.0.1") and transport (e.g. "tcp"). Set mustConnect to true if you
// want the client to connect before reporting success.
func NewRemoteClientCreator(addr, transport string, mustConnect bool) ClientCreator {
return &remoteClientCreator{
addr: addr,
transport: transport,
mustConnect: mustConnect,
}
}
func (r *remoteClientCreator) NewABCIClient() (abcicli.Client, error) {
remoteApp, err := abcicli.NewClient(r.addr, r.transport, r.mustConnect)
if err != nil {
return nil, fmt.Errorf("failed to connect to proxy: %w", err)
}
return remoteApp, nil
}
// DefaultClientCreator returns a default ClientCreator, which will create a
// local client if addr is one of: 'counter', 'counter_serial', 'kvstore',
// 'persistent_kvstore' or 'noop', otherwise - a remote client.
//
// The Closer is a noop except for persistent_kvstore applications,
// which will clean up the store.
func DefaultClientCreator(addr, transport, dbDir string) (ClientCreator, io.Closer) {
switch addr {
case "counter":
return NewLocalClientCreator(counter.NewApplication(false)), noopCloser{}
case "counter_serial":
return NewLocalClientCreator(counter.NewApplication(true)), noopCloser{}
case "kvstore":
return NewLocalClientCreator(kvstore.NewApplication()), noopCloser{}
case "persistent_kvstore":
app := kvstore.NewPersistentKVStoreApplication(dbDir)
return NewLocalClientCreator(app), app
case "noop":
return NewLocalClientCreator(types.NewBaseApplication()), noopCloser{}
default:
mustConnect := false // loop retrying
return NewRemoteClientCreator(addr, transport, mustConnect), noopCloser{}
}
}
type noopCloser struct{}
func (noopCloser) Close() error { return nil }