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516 lines
15 KiB
516 lines
15 KiB
package client
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import (
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"context"
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"strings"
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"sync"
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"time"
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"github.com/pkg/errors"
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amino "github.com/tendermint/go-amino"
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cmn "github.com/tendermint/tendermint/libs/common"
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tmpubsub "github.com/tendermint/tendermint/libs/pubsub"
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ctypes "github.com/tendermint/tendermint/rpc/core/types"
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rpcclient "github.com/tendermint/tendermint/rpc/lib/client"
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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 with a Tendermint node over
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JSON RPC and WebSockets.
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This is the main implementation you probably want to use in production code.
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There are other implementations when calling the Tendermint node in-process
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(Local), or when you want to mock out the server for test code (mock).
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You can subscribe for any event published by Tendermint using Subscribe method.
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Note delivery is best-effort. If you don't read events fast enough or network is
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slow, Tendermint might cancel the subscription. The client will attempt to
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resubscribe (you don't need to do anything). It will keep trying every second
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indefinitely until successful.
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Request batching is available for JSON RPC requests over HTTP, which conforms to
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the JSON RPC specification (https://www.jsonrpc.org/specification#batch). See
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the example for more details.
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*/
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type HTTP struct {
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remote string
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rpc *rpcclient.JSONRPCClient
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*baseRPCClient
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*WSEvents
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}
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// BatchHTTP provides the same interface as `HTTP`, but allows for batching of
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// requests (as per https://www.jsonrpc.org/specification#batch). Do not
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// instantiate directly - rather use the HTTP.NewBatch() method to create an
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// instance of this struct.
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//
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// Batching of HTTP requests is thread-safe in the sense that multiple
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// goroutines can each create their own batches and send them using the same
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// HTTP client. Multiple goroutines could also enqueue transactions in a single
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// batch, but ordering of transactions in the batch cannot be guaranteed in such
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// an example.
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type BatchHTTP struct {
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rpcBatch *rpcclient.JSONRPCRequestBatch
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*baseRPCClient
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}
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// rpcClient is an internal interface to which our RPC clients (batch and
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// non-batch) must conform. Acts as an additional code-level sanity check to
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// make sure the implementations stay coherent.
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type rpcClient interface {
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ABCIClient
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HistoryClient
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NetworkClient
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SignClient
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StatusClient
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}
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// baseRPCClient implements the basic RPC method logic without the actual
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// underlying RPC call functionality, which is provided by `caller`.
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type baseRPCClient struct {
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caller rpcclient.JSONRPCCaller
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}
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var _ rpcClient = (*HTTP)(nil)
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var _ rpcClient = (*BatchHTTP)(nil)
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var _ rpcClient = (*baseRPCClient)(nil)
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//-----------------------------------------------------------------------------
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// HTTP
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// NewHTTP takes a remote endpoint in the form <protocol>://<host>:<port> and
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// the websocket path (which always seems to be "/websocket")
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func NewHTTP(remote, wsEndpoint string) *HTTP {
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rc := rpcclient.NewJSONRPCClient(remote)
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cdc := rc.Codec()
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ctypes.RegisterAmino(cdc)
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rc.SetCodec(cdc)
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return &HTTP{
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rpc: rc,
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remote: remote,
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baseRPCClient: &baseRPCClient{caller: rc},
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WSEvents: newWSEvents(cdc, remote, wsEndpoint),
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}
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}
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var _ Client = (*HTTP)(nil)
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// NewBatch creates a new batch client for this HTTP client.
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func (c *HTTP) NewBatch() *BatchHTTP {
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rpcBatch := c.rpc.NewRequestBatch()
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return &BatchHTTP{
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rpcBatch: rpcBatch,
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baseRPCClient: &baseRPCClient{
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caller: rpcBatch,
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},
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}
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}
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//-----------------------------------------------------------------------------
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// BatchHTTP
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// Send is a convenience function for an HTTP batch that will trigger the
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// compilation of the batched requests and send them off using the client as a
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// single request. On success, this returns a list of the deserialized results
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// from each request in the sent batch.
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func (b *BatchHTTP) Send() ([]interface{}, error) {
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return b.rpcBatch.Send()
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}
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// Clear will empty out this batch of requests and return the number of requests
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// that were cleared out.
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func (b *BatchHTTP) Clear() int {
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return b.rpcBatch.Clear()
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}
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// Count returns the number of enqueued requests waiting to be sent.
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func (b *BatchHTTP) Count() int {
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return b.rpcBatch.Count()
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}
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//-----------------------------------------------------------------------------
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// baseRPCClient
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func (c *baseRPCClient) Status() (*ctypes.ResultStatus, error) {
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result := new(ctypes.ResultStatus)
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_, err := c.caller.Call("status", map[string]interface{}{}, result)
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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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return result, nil
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}
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func (c *baseRPCClient) ABCIInfo() (*ctypes.ResultABCIInfo, error) {
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result := new(ctypes.ResultABCIInfo)
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_, err := c.caller.Call("abci_info", map[string]interface{}{}, result)
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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 result, nil
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}
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func (c *baseRPCClient) ABCIQuery(path string, data cmn.HexBytes) (*ctypes.ResultABCIQuery, error) {
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return c.ABCIQueryWithOptions(path, data, DefaultABCIQueryOptions)
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}
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func (c *baseRPCClient) ABCIQueryWithOptions(path string, data cmn.HexBytes, opts ABCIQueryOptions) (*ctypes.ResultABCIQuery, error) {
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result := new(ctypes.ResultABCIQuery)
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_, err := c.caller.Call("abci_query",
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map[string]interface{}{"path": path, "data": data, "height": opts.Height, "prove": opts.Prove},
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result)
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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 result, nil
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}
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func (c *baseRPCClient) BroadcastTxCommit(tx types.Tx) (*ctypes.ResultBroadcastTxCommit, error) {
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result := new(ctypes.ResultBroadcastTxCommit)
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_, err := c.caller.Call("broadcast_tx_commit", map[string]interface{}{"tx": tx}, result)
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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 result, nil
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}
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func (c *baseRPCClient) 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 *baseRPCClient) 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 *baseRPCClient) broadcastTX(route string, tx types.Tx) (*ctypes.ResultBroadcastTx, error) {
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result := new(ctypes.ResultBroadcastTx)
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_, err := c.caller.Call(route, map[string]interface{}{"tx": tx}, result)
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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 result, nil
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}
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func (c *baseRPCClient) UnconfirmedTxs(limit int) (*ctypes.ResultUnconfirmedTxs, error) {
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result := new(ctypes.ResultUnconfirmedTxs)
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_, err := c.caller.Call("unconfirmed_txs", map[string]interface{}{"limit": limit}, result)
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if err != nil {
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return nil, errors.Wrap(err, "unconfirmed_txs")
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}
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return result, nil
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}
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func (c *baseRPCClient) NumUnconfirmedTxs() (*ctypes.ResultUnconfirmedTxs, error) {
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result := new(ctypes.ResultUnconfirmedTxs)
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_, err := c.caller.Call("num_unconfirmed_txs", map[string]interface{}{}, result)
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if err != nil {
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return nil, errors.Wrap(err, "num_unconfirmed_txs")
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}
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return result, nil
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}
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func (c *baseRPCClient) NetInfo() (*ctypes.ResultNetInfo, error) {
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result := new(ctypes.ResultNetInfo)
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_, err := c.caller.Call("net_info", map[string]interface{}{}, result)
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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 result, nil
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}
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func (c *baseRPCClient) DumpConsensusState() (*ctypes.ResultDumpConsensusState, error) {
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result := new(ctypes.ResultDumpConsensusState)
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_, err := c.caller.Call("dump_consensus_state", map[string]interface{}{}, result)
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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 result, nil
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}
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func (c *baseRPCClient) ConsensusState() (*ctypes.ResultConsensusState, error) {
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result := new(ctypes.ResultConsensusState)
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_, err := c.caller.Call("consensus_state", map[string]interface{}{}, result)
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if err != nil {
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return nil, errors.Wrap(err, "ConsensusState")
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}
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return result, nil
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}
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func (c *baseRPCClient) Health() (*ctypes.ResultHealth, error) {
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result := new(ctypes.ResultHealth)
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_, err := c.caller.Call("health", map[string]interface{}{}, result)
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if err != nil {
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return nil, errors.Wrap(err, "Health")
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}
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return result, nil
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}
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func (c *baseRPCClient) BlockchainInfo(minHeight, maxHeight int64) (*ctypes.ResultBlockchainInfo, error) {
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result := new(ctypes.ResultBlockchainInfo)
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_, err := c.caller.Call("blockchain",
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map[string]interface{}{"minHeight": minHeight, "maxHeight": maxHeight},
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result)
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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 result, nil
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}
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func (c *baseRPCClient) Genesis() (*ctypes.ResultGenesis, error) {
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result := new(ctypes.ResultGenesis)
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_, err := c.caller.Call("genesis", map[string]interface{}{}, result)
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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 result, nil
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}
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func (c *baseRPCClient) Block(height *int64) (*ctypes.ResultBlock, error) {
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result := new(ctypes.ResultBlock)
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_, err := c.caller.Call("block", map[string]interface{}{"height": height}, result)
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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 result, nil
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}
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func (c *baseRPCClient) BlockResults(height *int64) (*ctypes.ResultBlockResults, error) {
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result := new(ctypes.ResultBlockResults)
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_, err := c.caller.Call("block_results", map[string]interface{}{"height": height}, result)
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if err != nil {
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return nil, errors.Wrap(err, "Block Result")
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}
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return result, nil
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}
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func (c *baseRPCClient) Commit(height *int64) (*ctypes.ResultCommit, error) {
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result := new(ctypes.ResultCommit)
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_, err := c.caller.Call("commit", map[string]interface{}{"height": height}, result)
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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 result, nil
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}
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func (c *baseRPCClient) Tx(hash []byte, prove bool) (*ctypes.ResultTx, error) {
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result := new(ctypes.ResultTx)
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params := map[string]interface{}{
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"hash": hash,
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"prove": prove,
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}
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_, err := c.caller.Call("tx", params, result)
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if err != nil {
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return nil, errors.Wrap(err, "Tx")
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}
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return result, nil
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}
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func (c *baseRPCClient) TxSearch(query string, prove bool, page, perPage int) (*ctypes.ResultTxSearch, error) {
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result := new(ctypes.ResultTxSearch)
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params := map[string]interface{}{
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"query": query,
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"prove": prove,
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"page": page,
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"per_page": perPage,
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}
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_, err := c.caller.Call("tx_search", params, result)
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if err != nil {
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return nil, errors.Wrap(err, "TxSearch")
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}
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return result, nil
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}
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func (c *baseRPCClient) Validators(height *int64) (*ctypes.ResultValidators, error) {
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result := new(ctypes.ResultValidators)
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_, err := c.caller.Call("validators", map[string]interface{}{"height": height}, result)
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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 result, nil
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}
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func (c *baseRPCClient) BroadcastEvidence(ev types.Evidence) (*ctypes.ResultBroadcastEvidence, error) {
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result := new(ctypes.ResultBroadcastEvidence)
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_, err := c.caller.Call("broadcast_evidence", map[string]interface{}{"evidence": ev}, result)
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if err != nil {
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return nil, errors.Wrap(err, "BroadcastEvidence")
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}
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return result, nil
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}
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//-----------------------------------------------------------------------------
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// WSEvents
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type WSEvents struct {
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cmn.BaseService
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cdc *amino.Codec
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remote string
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endpoint string
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ws *rpcclient.WSClient
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mtx sync.RWMutex
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// query -> chan
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subscriptions map[string]chan ctypes.ResultEvent
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}
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func newWSEvents(cdc *amino.Codec, remote, endpoint string) *WSEvents {
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wsEvents := &WSEvents{
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cdc: cdc,
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endpoint: endpoint,
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remote: remote,
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subscriptions: make(map[string]chan ctypes.ResultEvent),
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}
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wsEvents.BaseService = *cmn.NewBaseService(nil, "WSEvents", wsEvents)
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return wsEvents
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}
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// OnStart implements cmn.Service by starting WSClient and event loop.
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func (w *WSEvents) OnStart() error {
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w.ws = rpcclient.NewWSClient(w.remote, w.endpoint, rpcclient.OnReconnect(func() {
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// resubscribe immediately
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w.redoSubscriptionsAfter(0 * time.Second)
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}))
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w.ws.SetCodec(w.cdc)
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err := w.ws.Start()
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if err != nil {
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return err
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}
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go w.eventListener()
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return nil
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}
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// OnStop implements cmn.Service by stopping WSClient.
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func (w *WSEvents) OnStop() {
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_ = w.ws.Stop()
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}
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// Subscribe implements EventsClient by using WSClient to subscribe given
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// subscriber to query. By default, returns a channel with cap=1. Error is
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// returned if it fails to subscribe.
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// Channel is never closed to prevent clients from seeing an erroneus event.
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func (w *WSEvents) Subscribe(ctx context.Context, subscriber, query string,
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outCapacity ...int) (out <-chan ctypes.ResultEvent, err error) {
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if err := w.ws.Subscribe(ctx, query); err != nil {
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return nil, err
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}
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outCap := 1
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if len(outCapacity) > 0 {
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outCap = outCapacity[0]
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}
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outc := make(chan ctypes.ResultEvent, outCap)
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w.mtx.Lock()
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// subscriber param is ignored because Tendermint will override it with
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// remote IP anyway.
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w.subscriptions[query] = outc
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w.mtx.Unlock()
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return outc, nil
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}
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// Unsubscribe implements EventsClient by using WSClient to unsubscribe given
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// subscriber from query.
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func (w *WSEvents) Unsubscribe(ctx context.Context, subscriber, query string) error {
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if err := w.ws.Unsubscribe(ctx, query); err != nil {
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return err
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}
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w.mtx.Lock()
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_, ok := w.subscriptions[query]
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if ok {
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delete(w.subscriptions, query)
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}
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w.mtx.Unlock()
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return nil
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}
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// UnsubscribeAll implements EventsClient by using WSClient to unsubscribe
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// given subscriber from all the queries.
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func (w *WSEvents) UnsubscribeAll(ctx context.Context, subscriber string) error {
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if err := w.ws.UnsubscribeAll(ctx); err != nil {
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return err
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}
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w.mtx.Lock()
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w.subscriptions = make(map[string]chan ctypes.ResultEvent)
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w.mtx.Unlock()
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return nil
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}
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// After being reconnected, it is necessary to redo subscription to server
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// otherwise no data will be automatically received.
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func (w *WSEvents) redoSubscriptionsAfter(d time.Duration) {
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time.Sleep(d)
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w.mtx.RLock()
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defer w.mtx.RUnlock()
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for q := range w.subscriptions {
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err := w.ws.Subscribe(context.Background(), q)
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if err != nil {
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w.Logger.Error("Failed to resubscribe", "err", err)
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}
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}
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}
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func isErrAlreadySubscribed(err error) bool {
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return strings.Contains(err.Error(), tmpubsub.ErrAlreadySubscribed.Error())
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}
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func (w *WSEvents) eventListener() {
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for {
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select {
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case resp, ok := <-w.ws.ResponsesCh:
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if !ok {
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return
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}
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if resp.Error != nil {
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w.Logger.Error("WS error", "err", resp.Error.Error())
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// Error can be ErrAlreadySubscribed or max client (subscriptions per
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// client) reached or Tendermint exited.
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// We can ignore ErrAlreadySubscribed, but need to retry in other
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// cases.
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if !isErrAlreadySubscribed(resp.Error) {
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// Resubscribe after 1 second to give Tendermint time to restart (if
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// crashed).
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w.redoSubscriptionsAfter(1 * time.Second)
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}
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continue
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}
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result := new(ctypes.ResultEvent)
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err := w.cdc.UnmarshalJSON(resp.Result, result)
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if err != nil {
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w.Logger.Error("failed to unmarshal response", "err", err)
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continue
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}
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w.mtx.RLock()
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if out, ok := w.subscriptions[result.Query]; ok {
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if cap(out) == 0 {
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out <- *result
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} else {
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select {
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case out <- *result:
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default:
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|
w.Logger.Error("wanted to publish ResultEvent, but out channel is full", "result", result, "query", result.Query)
|
|
}
|
|
}
|
|
}
|
|
w.mtx.RUnlock()
|
|
case <-w.Quit():
|
|
return
|
|
}
|
|
}
|
|
}
|