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122 lines
3.1 KiB
122 lines
3.1 KiB
package proxy
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import (
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"context"
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"fmt"
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"net"
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"net/http"
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"github.com/tendermint/tendermint/libs/log"
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tmpubsub "github.com/tendermint/tendermint/libs/pubsub"
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"github.com/tendermint/tendermint/light"
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lrpc "github.com/tendermint/tendermint/light/rpc"
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rpchttp "github.com/tendermint/tendermint/rpc/client/http"
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rpcserver "github.com/tendermint/tendermint/rpc/jsonrpc/server"
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)
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// A Proxy defines parameters for running an HTTP server proxy.
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type Proxy struct {
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Addr string // TCP address to listen on, ":http" if empty
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Config *rpcserver.Config
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Client *lrpc.Client
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Logger log.Logger
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Listener net.Listener
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}
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// NewProxy creates the struct used to run an HTTP server for serving light
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// client rpc requests.
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func NewProxy(
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lightClient *light.Client,
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listenAddr, providerAddr string,
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config *rpcserver.Config,
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logger log.Logger,
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opts ...lrpc.Option,
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) (*Proxy, error) {
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rpcClient, err := rpchttp.NewWithTimeout(providerAddr, config.WriteTimeout)
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if err != nil {
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return nil, fmt.Errorf("failed to create http client for %s: %w", providerAddr, err)
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}
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return &Proxy{
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Addr: listenAddr,
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Config: config,
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Client: lrpc.NewClient(rpcClient, lightClient, opts...),
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Logger: logger,
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}, nil
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}
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// ListenAndServe configures the rpcserver.WebsocketManager, sets up the RPC
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// routes to proxy via Client, and starts up an HTTP server on the TCP network
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// address p.Addr.
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// See http#Server#ListenAndServe.
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func (p *Proxy) ListenAndServe() error {
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listener, mux, err := p.listen()
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if err != nil {
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return err
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}
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p.Listener = listener
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return rpcserver.Serve(
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listener,
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mux,
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p.Logger,
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p.Config,
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)
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}
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// ListenAndServeTLS acts identically to ListenAndServe, except that it expects
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// HTTPS connections.
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// See http#Server#ListenAndServeTLS.
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func (p *Proxy) ListenAndServeTLS(certFile, keyFile string) error {
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listener, mux, err := p.listen()
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if err != nil {
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return err
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}
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p.Listener = listener
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return rpcserver.ServeTLS(
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listener,
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mux,
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certFile,
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keyFile,
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p.Logger,
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p.Config,
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)
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}
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func (p *Proxy) listen() (net.Listener, *http.ServeMux, error) {
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mux := http.NewServeMux()
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// 1) Register regular routes.
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r := RPCRoutes(p.Client)
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rpcserver.RegisterRPCFuncs(mux, r, p.Logger)
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// 2) Allow websocket connections.
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wmLogger := p.Logger.With("protocol", "websocket")
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wm := rpcserver.NewWebsocketManager(r,
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rpcserver.OnDisconnect(func(remoteAddr string) {
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err := p.Client.UnsubscribeAll(context.Background(), remoteAddr)
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if err != nil && err != tmpubsub.ErrSubscriptionNotFound {
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wmLogger.Error("Failed to unsubscribe addr from events", "addr", remoteAddr, "err", err)
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}
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}),
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rpcserver.ReadLimit(p.Config.MaxBodyBytes),
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)
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wm.SetLogger(wmLogger)
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mux.HandleFunc("/websocket", wm.WebsocketHandler)
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// 3) Start a client.
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if !p.Client.IsRunning() {
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if err := p.Client.Start(); err != nil {
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return nil, mux, fmt.Errorf("can't start client: %w", err)
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}
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}
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// 4) Start listening for new connections.
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listener, err := rpcserver.Listen(p.Addr, p.Config.MaxOpenConnections)
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if err != nil {
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return nil, mux, err
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}
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return listener, mux, nil
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}
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