package local import ( "context" "errors" "fmt" "time" rpccore "github.com/tendermint/tendermint/internal/rpc/core" "github.com/tendermint/tendermint/libs/bytes" "github.com/tendermint/tendermint/libs/log" "github.com/tendermint/tendermint/libs/pubsub" "github.com/tendermint/tendermint/libs/pubsub/query" rpcclient "github.com/tendermint/tendermint/rpc/client" "github.com/tendermint/tendermint/rpc/coretypes" rpctypes "github.com/tendermint/tendermint/rpc/jsonrpc/types" "github.com/tendermint/tendermint/types" ) /* Local is a Client implementation that directly executes the rpc functions on a given node, without going through HTTP or GRPC. This implementation is useful for: * Running tests against a node in-process without the overhead of going through an http server * Communication between an ABCI app and Tendermint core when they are compiled in process. For real clients, you probably want to use client.HTTP. For more powerful control during testing, you probably want the "client/mock" package. You can subscribe for any event published by Tendermint using Subscribe method. Note delivery is best-effort. If you don't read events fast enough, Tendermint might cancel the subscription. The client will attempt to resubscribe (you don't need to do anything). It will keep trying indefinitely with exponential backoff (10ms -> 20ms -> 40ms) until successful. */ type Local struct { *types.EventBus Logger log.Logger ctx *rpctypes.Context env *rpccore.Environment } // NodeService describes the portion of the node interface that the // local RPC client constructor needs to build a local client. type NodeService interface { RPCEnvironment() *rpccore.Environment EventBus() *types.EventBus } // New configures a client that calls the Node directly. func New(node NodeService) (*Local, error) { env := node.RPCEnvironment() if env == nil { return nil, errors.New("rpc is nil") } return &Local{ EventBus: node.EventBus(), Logger: log.NewNopLogger(), ctx: &rpctypes.Context{}, env: env, }, nil } var _ rpcclient.Client = (*Local)(nil) // SetLogger allows to set a logger on the client. func (c *Local) SetLogger(l log.Logger) { c.Logger = l } func (c *Local) Status(ctx context.Context) (*coretypes.ResultStatus, error) { return c.env.Status(c.ctx) } func (c *Local) ABCIInfo(ctx context.Context) (*coretypes.ResultABCIInfo, error) { return c.env.ABCIInfo(c.ctx) } func (c *Local) ABCIQuery(ctx context.Context, path string, data bytes.HexBytes) (*coretypes.ResultABCIQuery, error) { return c.ABCIQueryWithOptions(ctx, path, data, rpcclient.DefaultABCIQueryOptions) } func (c *Local) ABCIQueryWithOptions( ctx context.Context, path string, data bytes.HexBytes, opts rpcclient.ABCIQueryOptions) (*coretypes.ResultABCIQuery, error) { return c.env.ABCIQuery(c.ctx, path, data, opts.Height, opts.Prove) } func (c *Local) BroadcastTxCommit(ctx context.Context, tx types.Tx) (*coretypes.ResultBroadcastTxCommit, error) { return c.env.BroadcastTxCommit(c.ctx, tx) } func (c *Local) BroadcastTxAsync(ctx context.Context, tx types.Tx) (*coretypes.ResultBroadcastTx, error) { return c.env.BroadcastTxAsync(c.ctx, tx) } func (c *Local) BroadcastTxSync(ctx context.Context, tx types.Tx) (*coretypes.ResultBroadcastTx, error) { return c.env.BroadcastTxSync(c.ctx, tx) } func (c *Local) UnconfirmedTxs(ctx context.Context, limit *int) (*coretypes.ResultUnconfirmedTxs, error) { return c.env.UnconfirmedTxs(c.ctx, limit) } func (c *Local) NumUnconfirmedTxs(ctx context.Context) (*coretypes.ResultUnconfirmedTxs, error) { return c.env.NumUnconfirmedTxs(c.ctx) } func (c *Local) CheckTx(ctx context.Context, tx types.Tx) (*coretypes.ResultCheckTx, error) { return c.env.CheckTx(c.ctx, tx) } func (c *Local) RemoveTx(ctx context.Context, txKey types.TxKey) error { return c.env.Mempool.RemoveTxByKey(txKey) } func (c *Local) NetInfo(ctx context.Context) (*coretypes.ResultNetInfo, error) { return c.env.NetInfo(c.ctx) } func (c *Local) DumpConsensusState(ctx context.Context) (*coretypes.ResultDumpConsensusState, error) { return c.env.DumpConsensusState(c.ctx) } func (c *Local) ConsensusState(ctx context.Context) (*coretypes.ResultConsensusState, error) { return c.env.GetConsensusState(c.ctx) } func (c *Local) ConsensusParams(ctx context.Context, height *int64) (*coretypes.ResultConsensusParams, error) { return c.env.ConsensusParams(c.ctx, height) } func (c *Local) Health(ctx context.Context) (*coretypes.ResultHealth, error) { return c.env.Health(c.ctx) } func (c *Local) BlockchainInfo(ctx context.Context, minHeight, maxHeight int64) (*coretypes.ResultBlockchainInfo, error) { //nolint:lll return c.env.BlockchainInfo(c.ctx, minHeight, maxHeight) } func (c *Local) Genesis(ctx context.Context) (*coretypes.ResultGenesis, error) { return c.env.Genesis(c.ctx) } func (c *Local) GenesisChunked(ctx context.Context, id uint) (*coretypes.ResultGenesisChunk, error) { return c.env.GenesisChunked(c.ctx, id) } func (c *Local) Block(ctx context.Context, height *int64) (*coretypes.ResultBlock, error) { return c.env.Block(c.ctx, height) } func (c *Local) BlockByHash(ctx context.Context, hash bytes.HexBytes) (*coretypes.ResultBlock, error) { return c.env.BlockByHash(c.ctx, hash) } func (c *Local) BlockResults(ctx context.Context, height *int64) (*coretypes.ResultBlockResults, error) { return c.env.BlockResults(c.ctx, height) } func (c *Local) Commit(ctx context.Context, height *int64) (*coretypes.ResultCommit, error) { return c.env.Commit(c.ctx, height) } func (c *Local) Validators(ctx context.Context, height *int64, page, perPage *int) (*coretypes.ResultValidators, error) { //nolint:lll return c.env.Validators(c.ctx, height, page, perPage) } func (c *Local) Tx(ctx context.Context, hash bytes.HexBytes, prove bool) (*coretypes.ResultTx, error) { return c.env.Tx(c.ctx, hash, prove) } func (c *Local) TxSearch( _ context.Context, queryString string, prove bool, page, perPage *int, orderBy string, ) (*coretypes.ResultTxSearch, error) { return c.env.TxSearch(c.ctx, queryString, prove, page, perPage, orderBy) } func (c *Local) BlockSearch( _ context.Context, queryString string, page, perPage *int, orderBy string, ) (*coretypes.ResultBlockSearch, error) { return c.env.BlockSearch(c.ctx, queryString, page, perPage, orderBy) } func (c *Local) BroadcastEvidence(ctx context.Context, ev types.Evidence) (*coretypes.ResultBroadcastEvidence, error) { return c.env.BroadcastEvidence(c.ctx, ev) } func (c *Local) Subscribe( ctx context.Context, subscriber, queryString string, outCapacity ...int) (out <-chan coretypes.ResultEvent, err error) { q, err := query.New(queryString) if err != nil { return nil, fmt.Errorf("failed to parse query: %w", err) } outCap := 1 if len(outCapacity) > 0 { outCap = outCapacity[0] } var sub types.Subscription if outCap > 0 { sub, err = c.EventBus.Subscribe(ctx, subscriber, q, outCap) } else { sub, err = c.EventBus.SubscribeUnbuffered(ctx, subscriber, q) } if err != nil { return nil, fmt.Errorf("failed to subscribe: %w", err) } outc := make(chan coretypes.ResultEvent, outCap) go c.eventsRoutine(sub, subscriber, q, outc) return outc, nil } func (c *Local) eventsRoutine( sub types.Subscription, subscriber string, q pubsub.Query, outc chan<- coretypes.ResultEvent) { for { select { case msg := <-sub.Out(): result := coretypes.ResultEvent{ SubscriptionID: msg.SubscriptionID(), Query: q.String(), Data: msg.Data(), Events: msg.Events(), } if cap(outc) == 0 { outc <- result } else { select { case outc <- result: default: c.Logger.Error("wanted to publish ResultEvent, but out channel is full", "result", result, "query", result.Query) } } case <-sub.Canceled(): if sub.Err() == pubsub.ErrUnsubscribed { return } c.Logger.Error("subscription was canceled, resubscribing...", "err", sub.Err(), "query", q.String()) sub = c.resubscribe(subscriber, q) if sub == nil { // client was stopped return } case <-c.Quit(): return } } } // Try to resubscribe with exponential backoff. func (c *Local) resubscribe(subscriber string, q pubsub.Query) types.Subscription { attempts := 0 for { if !c.IsRunning() { return nil } sub, err := c.EventBus.Subscribe(context.Background(), subscriber, q) if err == nil { return sub } attempts++ time.Sleep((10 << uint(attempts)) * time.Millisecond) // 10ms -> 20ms -> 40ms } } func (c *Local) Unsubscribe(ctx context.Context, subscriber, queryString string) error { args := pubsub.UnsubscribeArgs{Subscriber: subscriber} var err error args.Query, err = query.New(queryString) if err != nil { // if this isn't a valid query it might be an ID, so // we'll try that. It'll turn into an error when we // try to unsubscribe. Eventually, perhaps, we'll want // to change the interface to only allow // unsubscription by ID, but that's a larger change. args.ID = queryString } return c.EventBus.Unsubscribe(ctx, args) } func (c *Local) UnsubscribeAll(ctx context.Context, subscriber string) error { return c.EventBus.UnsubscribeAll(ctx, subscriber) }