client

package
v0.31.8 Latest Latest
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 Go to latest Published: Jul 29, 2019 License: Apache-2.0 Imports: 16 Imported by: 0

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Index

Examples

Constants

This section is empty.

Variables

View Source 
var DefaultABCIQueryOptions = ABCIQueryOptions{Height: 0, Prove: false}

DefaultABCIQueryOptions are latest height (0) and prove false.

Functions

func DefaultWaitStrategy 

func DefaultWaitStrategy(delta int64) (abort error)

DefaultWaitStrategy is the standard backoff algorithm, but you can plug in another one

func WaitForHeight 

func WaitForHeight(c StatusClient, h int64, waiter Waiter) error

Wait for height will poll status at reasonable intervals until the block at the given height is available.

If waiter is nil, we use DefaultWaitStrategy, but you can also provide your own implementation

func WaitForOneEvent 

func WaitForOneEvent(c EventsClient, evtTyp string, timeout time.Duration) (types.TMEventData, error)

WaitForOneEvent subscribes to a websocket event for the given event time and returns upon receiving it one time, or when the timeout duration has expired.

This handles subscribing and unsubscribing under the hood

Types

type ABCIClient 

type ABCIClient interface {
	// Reading from abci app
	ABCIInfo() (*ctypes.ResultABCIInfo, error)
	ABCIQuery(path string, data cmn.HexBytes) (*ctypes.ResultABCIQuery, error)
	ABCIQueryWithOptions(path string, data cmn.HexBytes,
		opts ABCIQueryOptions) (*ctypes.ResultABCIQuery, error)

	// Writing to abci app
	BroadcastTxCommit(tx types.Tx) (*ctypes.ResultBroadcastTxCommit, error)
	BroadcastTxAsync(tx types.Tx) (*ctypes.ResultBroadcastTx, error)
	BroadcastTxSync(tx types.Tx) (*ctypes.ResultBroadcastTx, error)
}

ABCIClient groups together the functionality that principally affects the ABCI app. In many cases this will be all we want, so we can accept an interface which is easier to mock

type ABCIQueryOptions 

type ABCIQueryOptions struct {
	Height int64
	Prove  bool
}

ABCIQueryOptions can be used to provide options for ABCIQuery call other than the DefaultABCIQueryOptions.

type BatchHTTP added in v0.31.6 

type BatchHTTP struct {
	// contains filtered or unexported fields
}

BatchHTTP provides the same interface as `HTTP`, but allows for batching of requests (as per https://www.jsonrpc.org/specification#batch). Do not instantiate directly - rather use the HTTP.NewBatch() method to create an instance of this struct.

Batching of HTTP requests is thread-safe in the sense that multiple goroutines can each create their own batches and send them using the same HTTP client. Multiple goroutines could also enqueue transactions in a single batch, but ordering of transactions in the batch cannot be guaranteed in such an example.

func (BatchHTTP) ABCIInfo added in v0.31.6 

func (c BatchHTTP) ABCIInfo() (*ctypes.ResultABCIInfo, error)

func (BatchHTTP) ABCIQuery added in v0.31.6 

func (c BatchHTTP) ABCIQuery(path string, data cmn.HexBytes) (*ctypes.ResultABCIQuery, error)

func (BatchHTTP) ABCIQueryWithOptions added in v0.31.6 

func (c BatchHTTP) ABCIQueryWithOptions(path string, data cmn.HexBytes, opts ABCIQueryOptions) (*ctypes.ResultABCIQuery, error)

func (BatchHTTP) Block added in v0.31.6 

func (c BatchHTTP) Block(height *int64) (*ctypes.ResultBlock, error)

func (BatchHTTP) BlockResults added in v0.31.6 

func (c BatchHTTP) BlockResults(height *int64) (*ctypes.ResultBlockResults, error)

func (BatchHTTP) BlockchainInfo added in v0.31.6 

func (c BatchHTTP) BlockchainInfo(minHeight, maxHeight int64) (*ctypes.ResultBlockchainInfo, error)

func (BatchHTTP) BroadcastTxAsync added in v0.31.6 

func (c BatchHTTP) BroadcastTxAsync(tx types.Tx) (*ctypes.ResultBroadcastTx, error)

func (BatchHTTP) BroadcastTxCommit added in v0.31.6 

func (c BatchHTTP) BroadcastTxCommit(tx types.Tx) (*ctypes.ResultBroadcastTxCommit, error)

func (BatchHTTP) BroadcastTxSync added in v0.31.6 

func (c BatchHTTP) BroadcastTxSync(tx types.Tx) (*ctypes.ResultBroadcastTx, error)

func (*BatchHTTP) Clear added in v0.31.6 

func (b *BatchHTTP) Clear() int

Clear will empty out this batch of requests and return the number of requests that were cleared out.

func (BatchHTTP) Commit added in v0.31.6 

func (c BatchHTTP) Commit(height *int64) (*ctypes.ResultCommit, error)

func (BatchHTTP) ConsensusState added in v0.31.6 

func (c BatchHTTP) ConsensusState() (*ctypes.ResultConsensusState, error)

func (*BatchHTTP) Count added in v0.31.6 

func (b *BatchHTTP) Count() int

Count returns the number of enqueued requests waiting to be sent.

func (BatchHTTP) DumpConsensusState added in v0.31.6 

func (c BatchHTTP) DumpConsensusState() (*ctypes.ResultDumpConsensusState, error)

func (BatchHTTP) Genesis added in v0.31.6 

func (c BatchHTTP) Genesis() (*ctypes.ResultGenesis, error)

func (BatchHTTP) Health added in v0.31.6 

func (c BatchHTTP) Health() (*ctypes.ResultHealth, error)

func (BatchHTTP) NetInfo added in v0.31.6 

func (c BatchHTTP) NetInfo() (*ctypes.ResultNetInfo, error)

func (BatchHTTP) NumUnconfirmedTxs added in v0.31.6 

func (c BatchHTTP) NumUnconfirmedTxs() (*ctypes.ResultUnconfirmedTxs, error)

func (*BatchHTTP) Send added in v0.31.6 

func (b *BatchHTTP) Send() ([]interface{}, error)

Send is a convenience function for an HTTP batch that will trigger the compilation of the batched requests and send them off using the client as a single request. On success, this returns a list of the deserialized results from each request in the sent batch.

func (BatchHTTP) Status added in v0.31.6 

func (c BatchHTTP) Status() (*ctypes.ResultStatus, error)

func (BatchHTTP) Tx added in v0.31.6 

func (c BatchHTTP) Tx(hash []byte, prove bool) (*ctypes.ResultTx, error)

func (BatchHTTP) TxSearch added in v0.31.6 

func (c BatchHTTP) TxSearch(query string, prove bool, page, perPage int) (*ctypes.ResultTxSearch, error)

func (BatchHTTP) UnconfirmedTxs added in v0.31.6 

func (c BatchHTTP) UnconfirmedTxs(limit int) (*ctypes.ResultUnconfirmedTxs, error)

func (BatchHTTP) Validators added in v0.31.6 

func (c BatchHTTP) Validators(height *int64) (*ctypes.ResultValidators, error)

type Client 

type Client interface {
	cmn.Service
	ABCIClient
	EventsClient
	HistoryClient
	NetworkClient
	SignClient
	StatusClient
}

Client wraps most important rpc calls a client would make if you want to listen for events, test if it also implements events.EventSwitch

type EventsClient 

type EventsClient interface {
	// Subscribe subscribes given subscriber to query. Returns a channel with
	// cap=1 onto which events are published. An error is returned if it fails to
	// subscribe. outCapacity can be used optionally to set capacity for the
	// channel. Channel is never closed to prevent accidental reads.
	//
	// ctx cannot be used to unsubscribe. To unsubscribe, use either Unsubscribe
	// or UnsubscribeAll.
	Subscribe(ctx context.Context, subscriber, query string, outCapacity ...int) (out <-chan ctypes.ResultEvent, err error)
	// Unsubscribe unsubscribes given subscriber from query.
	Unsubscribe(ctx context.Context, subscriber, query string) error
	// UnsubscribeAll unsubscribes given subscriber from all the queries.
	UnsubscribeAll(ctx context.Context, subscriber string) error
}

EventsClient is reactive, you can subscribe to any message, given the proper string. see tendermint/types/events.go

type HTTP 

type HTTP struct {
	*WSEvents
	// contains filtered or unexported fields
}

HTTP is a Client implementation that communicates with a Tendermint node over JSON RPC and WebSockets.

This is the main implementation you probably want to use in production code. There are other implementations when calling the Tendermint node in-process (Local), or when you want to mock out the server for test code (mock).

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 or network is slow, Tendermint might cancel the subscription. The client will attempt to resubscribe (you don't need to do anything). It will keep trying every second indefinitely until successful.

Request batching is available for JSON RPC requests over HTTP, which conforms to the JSON RPC specification (https://www.jsonrpc.org/specification#batch). See the example for more details.

Example (Batching) 
package main

import (
	"fmt"

	"github.com/tendermint/tendermint/abci/example/kvstore"
	"github.com/tendermint/tendermint/rpc/client"

	ctypes "github.com/tendermint/tendermint/rpc/core/types"

	rpctest "github.com/tendermint/tendermint/rpc/test"
)

func main() {
	// Start a tendermint node (and kvstore) in the background to test against
	app := kvstore.NewKVStoreApplication()
	node := rpctest.StartTendermint(app, rpctest.SuppressStdout, rpctest.RecreateConfig)
	defer rpctest.StopTendermint(node)

	// Create our RPC client
	rpcAddr := rpctest.GetConfig().RPC.ListenAddress
	c := client.NewHTTP(rpcAddr, "/websocket")

	// Create our two transactions
	k1 := []byte("firstName")
	v1 := []byte("satoshi")
	tx1 := append(k1, append([]byte("="), v1...)...)

	k2 := []byte("lastName")
	v2 := []byte("nakamoto")
	tx2 := append(k2, append([]byte("="), v2...)...)

	txs := [][]byte{tx1, tx2}

	// Create a new batch
	batch := c.NewBatch()

	// Queue up our transactions
	for _, tx := range txs {
		if _, err := batch.BroadcastTxCommit(tx); err != nil {
			panic(err)
		}
	}

	// Send the batch of 2 transactions
	if _, err := batch.Send(); err != nil {
		panic(err)
	}

	// Now let's query for the original results as a batch
	keys := [][]byte{k1, k2}
	for _, key := range keys {
		if _, err := batch.ABCIQuery("/key", key); err != nil {
			panic(err)
		}
	}

	// Send the 2 queries and keep the results
	results, err := batch.Send()
	if err != nil {
		panic(err)
	}

	// Each result in the returned list is the deserialized result of each
	// respective ABCIQuery response
	for _, result := range results {
		qr, ok := result.(*ctypes.ResultABCIQuery)
		if !ok {
			panic("invalid result type from ABCIQuery request")
		}
		fmt.Println(string(qr.Response.Key), "=", string(qr.Response.Value))
	}

}

Output:

firstName = satoshi
lastName = nakamoto
Example (Simple) 
package main

import (
	"bytes"
	"fmt"

	"github.com/tendermint/tendermint/abci/example/kvstore"
	"github.com/tendermint/tendermint/rpc/client"

	rpctest "github.com/tendermint/tendermint/rpc/test"
)

func main() {
	// Start a tendermint node (and kvstore) in the background to test against
	app := kvstore.NewKVStoreApplication()
	node := rpctest.StartTendermint(app, rpctest.SuppressStdout, rpctest.RecreateConfig)
	defer rpctest.StopTendermint(node)

	// Create our RPC client
	rpcAddr := rpctest.GetConfig().RPC.ListenAddress
	c := client.NewHTTP(rpcAddr, "/websocket")

	// Create a transaction
	k := []byte("name")
	v := []byte("satoshi")
	tx := append(k, append([]byte("="), v...)...)

	// Broadcast the transaction and wait for it to commit (rather use
	// c.BroadcastTxSync though in production)
	bres, err := c.BroadcastTxCommit(tx)
	if err != nil {
		panic(err)
	}
	if bres.CheckTx.IsErr() || bres.DeliverTx.IsErr() {
		panic("BroadcastTxCommit transaction failed")
	}

	// Now try to fetch the value for the key
	qres, err := c.ABCIQuery("/key", k)
	if err != nil {
		panic(err)
	}
	if qres.Response.IsErr() {
		panic("ABCIQuery failed")
	}
	if !bytes.Equal(qres.Response.Key, k) {
		panic("returned key does not match queried key")
	}
	if !bytes.Equal(qres.Response.Value, v) {
		panic("returned value does not match sent value")
	}

	fmt.Println("Sent tx     :", string(tx))
	fmt.Println("Queried for :", string(qres.Response.Key))
	fmt.Println("Got value   :", string(qres.Response.Value))

}

Output:

Sent tx     : name=satoshi
Queried for : name
Got value   : satoshi

func NewHTTP 

func NewHTTP(remote, wsEndpoint string) *HTTP

NewHTTP takes a remote endpoint in the form <protocol>://<host>:<port> and the websocket path (which always seems to be "/websocket")

func (HTTP) ABCIInfo 

func (c HTTP) ABCIInfo() (*ctypes.ResultABCIInfo, error)

func (HTTP) ABCIQuery 

func (c HTTP) ABCIQuery(path string, data cmn.HexBytes) (*ctypes.ResultABCIQuery, error)

func (HTTP) ABCIQueryWithOptions 

func (c HTTP) ABCIQueryWithOptions(path string, data cmn.HexBytes, opts ABCIQueryOptions) (*ctypes.ResultABCIQuery, error)

func (HTTP) Block 

func (c HTTP) Block(height *int64) (*ctypes.ResultBlock, error)

func (HTTP) BlockResults 

func (c HTTP) BlockResults(height *int64) (*ctypes.ResultBlockResults, error)

func (HTTP) BlockchainInfo 

func (c HTTP) BlockchainInfo(minHeight, maxHeight int64) (*ctypes.ResultBlockchainInfo, error)

func (HTTP) BroadcastTxAsync 

func (c HTTP) BroadcastTxAsync(tx types.Tx) (*ctypes.ResultBroadcastTx, error)

func (HTTP) BroadcastTxCommit 

func (c HTTP) BroadcastTxCommit(tx types.Tx) (*ctypes.ResultBroadcastTxCommit, error)

func (HTTP) BroadcastTxSync 

func (c HTTP) BroadcastTxSync(tx types.Tx) (*ctypes.ResultBroadcastTx, error)

func (HTTP) Commit 

func (c HTTP) Commit(height *int64) (*ctypes.ResultCommit, error)

func (HTTP) ConsensusState 

func (c HTTP) ConsensusState() (*ctypes.ResultConsensusState, error)

func (HTTP) DumpConsensusState 

func (c HTTP) DumpConsensusState() (*ctypes.ResultDumpConsensusState, error)

func (HTTP) Genesis 

func (c HTTP) Genesis() (*ctypes.ResultGenesis, error)

func (HTTP) Health 

func (c HTTP) Health() (*ctypes.ResultHealth, error)

func (HTTP) NetInfo 

func (c HTTP) NetInfo() (*ctypes.ResultNetInfo, error)

func (*HTTP) NewBatch added in v0.31.6 

func (c *HTTP) NewBatch() *BatchHTTP

NewBatch creates a new batch client for this HTTP client.

func (HTTP) NumUnconfirmedTxs 

func (c HTTP) NumUnconfirmedTxs() (*ctypes.ResultUnconfirmedTxs, error)

func (HTTP) Status 

func (c HTTP) Status() (*ctypes.ResultStatus, error)

func (HTTP) Tx 

func (c HTTP) Tx(hash []byte, prove bool) (*ctypes.ResultTx, error)

func (HTTP) TxSearch 

func (c HTTP) TxSearch(query string, prove bool, page, perPage int) (*ctypes.ResultTxSearch, error)

func (HTTP) UnconfirmedTxs 

func (c HTTP) UnconfirmedTxs(limit int) (*ctypes.ResultUnconfirmedTxs, error)

func (HTTP) Validators 

func (c HTTP) Validators(height *int64) (*ctypes.ResultValidators, error)

type HistoryClient 

type HistoryClient interface {
	Genesis() (*ctypes.ResultGenesis, error)
	BlockchainInfo(minHeight, maxHeight int64) (*ctypes.ResultBlockchainInfo, error)
}

HistoryClient shows us data from genesis to now in large chunks.

type Local 

type Local struct {
	*types.EventBus
	Logger log.Logger
	// contains filtered or unexported fields
}

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.

func NewLocal 

func NewLocal(node *nm.Node) *Local

NewLocal configures a client that calls the Node directly.

Note that given how rpc/core works with package singletons, that you can only have one node per process. So make sure test cases don't run in parallel, or try to simulate an entire network in one process...

func (*Local) ABCIInfo 

func (c *Local) ABCIInfo() (*ctypes.ResultABCIInfo, error)

func (*Local) ABCIQuery 

func (c *Local) ABCIQuery(path string, data cmn.HexBytes) (*ctypes.ResultABCIQuery, error)

func (*Local) ABCIQueryWithOptions 

func (c *Local) ABCIQueryWithOptions(path string, data cmn.HexBytes, opts ABCIQueryOptions) (*ctypes.ResultABCIQuery, error)

func (*Local) Block 

func (c *Local) Block(height *int64) (*ctypes.ResultBlock, error)

func (*Local) BlockResults 

func (c *Local) BlockResults(height *int64) (*ctypes.ResultBlockResults, error)

func (*Local) BlockchainInfo 

func (c *Local) BlockchainInfo(minHeight, maxHeight int64) (*ctypes.ResultBlockchainInfo, error)

func (*Local) BroadcastTxAsync 

func (c *Local) BroadcastTxAsync(tx types.Tx) (*ctypes.ResultBroadcastTx, error)

func (*Local) BroadcastTxCommit 

func (c *Local) BroadcastTxCommit(tx types.Tx) (*ctypes.ResultBroadcastTxCommit, error)

func (*Local) BroadcastTxSync 

func (c *Local) BroadcastTxSync(tx types.Tx) (*ctypes.ResultBroadcastTx, error)

func (*Local) Commit 

func (c *Local) Commit(height *int64) (*ctypes.ResultCommit, error)

func (*Local) ConsensusState 

func (c *Local) ConsensusState() (*ctypes.ResultConsensusState, error)

func (*Local) DialPeers 

func (c *Local) DialPeers(peers []string, persistent bool) (*ctypes.ResultDialPeers, error)

func (*Local) DialSeeds 

func (c *Local) DialSeeds(seeds []string) (*ctypes.ResultDialSeeds, error)

func (*Local) DumpConsensusState 

func (c *Local) DumpConsensusState() (*ctypes.ResultDumpConsensusState, error)

func (*Local) Genesis 

func (c *Local) Genesis() (*ctypes.ResultGenesis, error)

func (*Local) Health 

func (c *Local) Health() (*ctypes.ResultHealth, error)

func (*Local) NetInfo 

func (c *Local) NetInfo() (*ctypes.ResultNetInfo, error)

func (*Local) NumUnconfirmedTxs 

func (c *Local) NumUnconfirmedTxs() (*ctypes.ResultUnconfirmedTxs, error)

func (*Local) SetLogger 

func (c *Local) SetLogger(l log.Logger)

SetLogger allows to set a logger on the client.

func (*Local) Status 

func (c *Local) Status() (*ctypes.ResultStatus, error)

func (*Local) Subscribe 

func (c *Local) Subscribe(ctx context.Context, subscriber, query string, outCapacity ...int) (out <-chan ctypes.ResultEvent, err error)

func (*Local) Tx 

func (c *Local) Tx(hash []byte, prove bool) (*ctypes.ResultTx, error)

func (*Local) TxSearch 

func (c *Local) TxSearch(query string, prove bool, page, perPage int) (*ctypes.ResultTxSearch, error)

func (*Local) UnconfirmedTxs 

func (c *Local) UnconfirmedTxs(limit int) (*ctypes.ResultUnconfirmedTxs, error)

func (*Local) Unsubscribe 

func (c *Local) Unsubscribe(ctx context.Context, subscriber, query string) error

func (*Local) UnsubscribeAll 

func (c *Local) UnsubscribeAll(ctx context.Context, subscriber string) error

func (*Local) Validators 

func (c *Local) Validators(height *int64) (*ctypes.ResultValidators, error)

type MempoolClient 

type MempoolClient interface {
	UnconfirmedTxs(limit int) (*ctypes.ResultUnconfirmedTxs, error)
	NumUnconfirmedTxs() (*ctypes.ResultUnconfirmedTxs, error)
}

MempoolClient shows us data about current mempool state.

type NetworkClient 

type NetworkClient interface {
	NetInfo() (*ctypes.ResultNetInfo, error)
	DumpConsensusState() (*ctypes.ResultDumpConsensusState, error)
	ConsensusState() (*ctypes.ResultConsensusState, error)
	Health() (*ctypes.ResultHealth, error)
}

NetworkClient is general info about the network state. May not be needed usually.

type SignClient 

type SignClient interface {
	Block(height *int64) (*ctypes.ResultBlock, error)
	BlockResults(height *int64) (*ctypes.ResultBlockResults, error)
	Commit(height *int64) (*ctypes.ResultCommit, error)
	Validators(height *int64) (*ctypes.ResultValidators, error)
	Tx(hash []byte, prove bool) (*ctypes.ResultTx, error)
	TxSearch(query string, prove bool, page, perPage int) (*ctypes.ResultTxSearch, error)
}

SignClient groups together the interfaces need to get valid signatures and prove anything about the chain

type StatusClient 

type StatusClient interface {
	// General chain info
	Status() (*ctypes.ResultStatus, error)
}

type WSEvents 

type WSEvents struct {
	cmn.BaseService
	// contains filtered or unexported fields
}

func (*WSEvents) OnStart 

func (w *WSEvents) OnStart() error

OnStart implements cmn.Service by starting WSClient and event loop.

func (*WSEvents) OnStop 

func (w *WSEvents) OnStop()

OnStop implements cmn.Service by stopping WSClient.

func (*WSEvents) Subscribe 

func (w *WSEvents) Subscribe(ctx context.Context, subscriber, query string,
	outCapacity ...int) (out <-chan ctypes.ResultEvent, err error)

Subscribe implements EventsClient by using WSClient to subscribe given subscriber to query. By default, returns a channel with cap=1. Error is returned if it fails to subscribe. Channel is never closed to prevent clients from seeing an erroneus event.

func (*WSEvents) Unsubscribe 

func (w *WSEvents) Unsubscribe(ctx context.Context, subscriber, query string) error

Unsubscribe implements EventsClient by using WSClient to unsubscribe given subscriber from query.

func (*WSEvents) UnsubscribeAll 

func (w *WSEvents) UnsubscribeAll(ctx context.Context, subscriber string) error

UnsubscribeAll implements EventsClient by using WSClient to unsubscribe given subscriber from all the queries.

type Waiter 

type Waiter func(delta int64) (abort error)

Waiter is informed of current height, decided whether to quit early

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