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349 lines
9.6 KiB
349 lines
9.6 KiB
package client
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import (
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"fmt"
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"github.com/pkg/errors"
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events "github.com/tendermint/go-events"
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"github.com/tendermint/go-rpc/client"
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wire "github.com/tendermint/go-wire"
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ctypes "github.com/tendermint/tendermint/rpc/core/types"
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"github.com/tendermint/tendermint/types"
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)
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/*
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HTTP is a Client implementation that communicates
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with a tendermint node over json rpc and websockets.
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This is the main implementation you probably want to use in
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production code. There are other implementations when calling
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the tendermint node in-process (local), or when you want to mock
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out the server for test code (mock).
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*/
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type HTTP struct {
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remote string
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rpc *rpcclient.ClientJSONRPC
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*WSEvents
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}
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// New takes a remote endpoint in the form tcp://<host>:<port>
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// and the websocket path (which always seems to be "/websocket")
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func NewHTTP(remote, wsEndpoint string) *HTTP {
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return &HTTP{
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rpc: rpcclient.NewClientJSONRPC(remote),
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remote: remote,
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WSEvents: newWSEvents(remote, wsEndpoint),
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}
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}
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func (c *HTTP) _assertIsClient() Client {
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return c
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}
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func (c *HTTP) _assertIsNetworkClient() NetworkClient {
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return c
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}
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func (c *HTTP) _assertIsEventSwitch() types.EventSwitch {
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return c
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}
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func (c *HTTP) Status() (*ctypes.ResultStatus, error) {
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tmResult := new(ctypes.TMResult)
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_, err := c.rpc.Call("status", []interface{}{}, tmResult)
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if err != nil {
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return nil, errors.Wrap(err, "Status")
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}
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// note: panics if rpc doesn't match. okay???
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return (*tmResult).(*ctypes.ResultStatus), nil
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}
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func (c *HTTP) ABCIInfo() (*ctypes.ResultABCIInfo, error) {
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tmResult := new(ctypes.TMResult)
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_, err := c.rpc.Call("abci_info", []interface{}{}, tmResult)
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if err != nil {
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return nil, errors.Wrap(err, "ABCIInfo")
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}
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return (*tmResult).(*ctypes.ResultABCIInfo), nil
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}
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func (c *HTTP) ABCIQuery(path string, data []byte, prove bool) (*ctypes.ResultABCIQuery, error) {
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tmResult := new(ctypes.TMResult)
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_, err := c.rpc.Call("abci_query", []interface{}{path, data, prove}, tmResult)
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if err != nil {
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return nil, errors.Wrap(err, "ABCIQuery")
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}
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return (*tmResult).(*ctypes.ResultABCIQuery), nil
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}
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func (c *HTTP) BroadcastTxCommit(tx types.Tx) (*ctypes.ResultBroadcastTxCommit, error) {
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tmResult := new(ctypes.TMResult)
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_, err := c.rpc.Call("broadcast_tx_commit", []interface{}{tx}, tmResult)
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if err != nil {
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return nil, errors.Wrap(err, "broadcast_tx_commit")
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}
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return (*tmResult).(*ctypes.ResultBroadcastTxCommit), nil
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}
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func (c *HTTP) BroadcastTxAsync(tx types.Tx) (*ctypes.ResultBroadcastTx, error) {
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return c.broadcastTX("broadcast_tx_async", tx)
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}
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func (c *HTTP) BroadcastTxSync(tx types.Tx) (*ctypes.ResultBroadcastTx, error) {
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return c.broadcastTX("broadcast_tx_sync", tx)
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}
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func (c *HTTP) broadcastTX(route string, tx types.Tx) (*ctypes.ResultBroadcastTx, error) {
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tmResult := new(ctypes.TMResult)
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_, err := c.rpc.Call(route, []interface{}{tx}, tmResult)
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if err != nil {
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return nil, errors.Wrap(err, route)
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}
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return (*tmResult).(*ctypes.ResultBroadcastTx), nil
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}
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func (c *HTTP) NetInfo() (*ctypes.ResultNetInfo, error) {
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tmResult := new(ctypes.TMResult)
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_, err := c.rpc.Call("net_info", nil, tmResult)
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if err != nil {
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return nil, errors.Wrap(err, "NetInfo")
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}
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return (*tmResult).(*ctypes.ResultNetInfo), nil
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}
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func (c *HTTP) DumpConsensusState() (*ctypes.ResultDumpConsensusState, error) {
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tmResult := new(ctypes.TMResult)
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_, err := c.rpc.Call("dump_consensus_state", nil, tmResult)
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if err != nil {
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return nil, errors.Wrap(err, "DumpConsensusState")
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}
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return (*tmResult).(*ctypes.ResultDumpConsensusState), nil
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}
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func (c *HTTP) BlockchainInfo(minHeight, maxHeight int) (*ctypes.ResultBlockchainInfo, error) {
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tmResult := new(ctypes.TMResult)
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_, err := c.rpc.Call("blockchain", []interface{}{minHeight, maxHeight}, tmResult)
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if err != nil {
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return nil, errors.Wrap(err, "BlockchainInfo")
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}
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return (*tmResult).(*ctypes.ResultBlockchainInfo), nil
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}
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func (c *HTTP) Genesis() (*ctypes.ResultGenesis, error) {
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tmResult := new(ctypes.TMResult)
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_, err := c.rpc.Call("genesis", nil, tmResult)
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if err != nil {
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return nil, errors.Wrap(err, "Genesis")
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}
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return (*tmResult).(*ctypes.ResultGenesis), nil
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}
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func (c *HTTP) Block(height int) (*ctypes.ResultBlock, error) {
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tmResult := new(ctypes.TMResult)
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_, err := c.rpc.Call("block", []interface{}{height}, tmResult)
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if err != nil {
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return nil, errors.Wrap(err, "Block")
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}
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return (*tmResult).(*ctypes.ResultBlock), nil
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}
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func (c *HTTP) Commit(height int) (*ctypes.ResultCommit, error) {
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tmResult := new(ctypes.TMResult)
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_, err := c.rpc.Call("commit", []interface{}{height}, tmResult)
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if err != nil {
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return nil, errors.Wrap(err, "Commit")
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}
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return (*tmResult).(*ctypes.ResultCommit), nil
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}
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func (c *HTTP) Validators() (*ctypes.ResultValidators, error) {
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tmResult := new(ctypes.TMResult)
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_, err := c.rpc.Call("validators", nil, tmResult)
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if err != nil {
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return nil, errors.Wrap(err, "Validators")
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}
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return (*tmResult).(*ctypes.ResultValidators), nil
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}
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/** websocket event stuff here... **/
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type WSEvents struct {
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types.EventSwitch
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remote string
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endpoint string
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ws *rpcclient.WSClient
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// used for signaling the goroutine that feeds ws -> EventSwitch
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quit chan bool
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done chan bool
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// used to maintain counts of actively listened events
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// so we can properly subscribe/unsubscribe
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// FIXME: thread-safety???
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// FIXME: reuse code from go-events???
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evtCount map[string]int // count how many time each event is subscribed
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listeners map[string][]string // keep track of which events each listener is listening to
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}
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func newWSEvents(remote, endpoint string) *WSEvents {
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return &WSEvents{
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EventSwitch: types.NewEventSwitch(),
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endpoint: endpoint,
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remote: remote,
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quit: make(chan bool, 1),
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done: make(chan bool, 1),
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evtCount: map[string]int{},
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listeners: map[string][]string{},
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}
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}
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func (w *WSEvents) _assertIsEventSwitch() types.EventSwitch {
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return w
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}
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// Start is the only way I could think the extend OnStart from
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// events.eventSwitch. If only it wasn't private...
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// BaseService.Start -> eventSwitch.OnStart -> WSEvents.Start
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func (w *WSEvents) Start() (bool, error) {
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st, err := w.EventSwitch.Start()
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// if we did start, then OnStart here...
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if st && err == nil {
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ws := rpcclient.NewWSClient(w.remote, w.endpoint)
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_, err = ws.Start()
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if err == nil {
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w.ws = ws
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go w.eventListener()
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}
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}
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return st, errors.Wrap(err, "StartWSEvent")
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}
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// Stop wraps the BaseService/eventSwitch actions as Start does
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func (w *WSEvents) Stop() bool {
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stop := w.EventSwitch.Stop()
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if stop {
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// send a message to quit to stop the eventListener
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w.quit <- true
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<-w.done
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w.ws.Stop()
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w.ws = nil
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}
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return stop
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}
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/** TODO: more intelligent subscriptions! **/
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func (w *WSEvents) AddListenerForEvent(listenerID, event string, cb events.EventCallback) {
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// no one listening -> subscribe
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if w.evtCount[event] == 0 {
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w.subscribe(event)
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}
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// if this listener was already listening to this event, return early
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for _, s := range w.listeners[listenerID] {
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if event == s {
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return
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}
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}
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// otherwise, add this event to this listener
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w.evtCount[event] += 1
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w.listeners[listenerID] = append(w.listeners[listenerID], event)
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w.EventSwitch.AddListenerForEvent(listenerID, event, cb)
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}
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func (w *WSEvents) RemoveListenerForEvent(event string, listenerID string) {
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// if this listener is listening already, splice it out
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found := false
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l := w.listeners[listenerID]
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for i, s := range l {
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if event == s {
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found = true
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w.listeners[listenerID] = append(l[:i], l[i+1:]...)
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break
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}
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}
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// if the listener wasn't already listening to the event, exit early
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if !found {
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return
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}
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// now we can update the subscriptions
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w.evtCount[event] -= 1
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if w.evtCount[event] == 0 {
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w.unsubscribe(event)
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}
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w.EventSwitch.RemoveListenerForEvent(event, listenerID)
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}
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func (w *WSEvents) RemoveListener(listenerID string) {
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// remove all counts for this listener
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for _, s := range w.listeners[listenerID] {
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w.evtCount[s] -= 1
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if w.evtCount[s] == 0 {
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w.unsubscribe(s)
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}
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}
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w.listeners[listenerID] = nil
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// then let the switch do it's magic
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w.EventSwitch.RemoveListener(listenerID)
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}
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// eventListener is an infinite loop pulling all websocket events
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// and pushing them to the EventSwitch.
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//
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// the goroutine only stops by closing quit
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func (w *WSEvents) eventListener() {
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for {
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select {
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case res := <-w.ws.ResultsCh:
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// res is json.RawMessage
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err := w.parseEvent(res)
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if err != nil {
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// FIXME: better logging/handling of errors??
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fmt.Printf("ws result: %+v\n", err)
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}
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case err := <-w.ws.ErrorsCh:
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// FIXME: better logging/handling of errors??
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fmt.Printf("ws err: %+v\n", err)
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case <-w.quit:
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// send a message so we can wait for the routine to exit
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// before cleaning up the w.ws stuff
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w.done <- true
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return
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}
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}
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}
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// parseEvent unmarshals the json message and converts it into
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// some implementation of types.TMEventData, and sends it off
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// on the merry way to the EventSwitch
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func (w *WSEvents) parseEvent(data []byte) (err error) {
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result := new(ctypes.TMResult)
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wire.ReadJSONPtr(result, data, &err)
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if err != nil {
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return err
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}
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event, ok := (*result).(*ctypes.ResultEvent)
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if !ok {
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// ignore silently (eg. subscribe, unsubscribe and maybe other events)
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return nil
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}
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// looks good! let's fire this baby!
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w.EventSwitch.FireEvent(event.Name, event.Data)
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return nil
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}
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// no way of exposing these failures, so we panic.
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// is this right? or silently ignore???
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func (w *WSEvents) subscribe(event string) {
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err := w.ws.Subscribe(event)
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if err != nil {
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panic(err)
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}
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}
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func (w *WSEvents) unsubscribe(event string) {
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err := w.ws.Unsubscribe(event)
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if err != nil {
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panic(err)
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}
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}
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