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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| package proxy | ||
|
|
||
| import ( | ||
| "context" | ||
| "os" | ||
| "os/signal" | ||
| "syscall" | ||
|
|
||
| "github.com/rs/zerolog" | ||
| "github.com/rs/zerolog/log" | ||
| "github.com/spf13/cobra" | ||
| "github.com/spf13/viper" | ||
|
|
||
| "github.com/shutter-network/shutter/shuttermint/cmd/shversion" | ||
| "github.com/shutter-network/shutter/shuttermint/proxy" | ||
| ) | ||
|
|
||
| var cfgFile string | ||
|
|
||
| func Cmd() *cobra.Command { | ||
| cmd := &cobra.Command{ | ||
| Use: "proxy", | ||
| Short: "Run a json rpc proxy", | ||
| Args: cobra.NoArgs, | ||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
| return proxyMain() | ||
| }, | ||
| } | ||
| cmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file") | ||
| cmd.MarkPersistentFlagRequired("config") | ||
| cmd.MarkPersistentFlagFilename("config") | ||
| return cmd | ||
| } | ||
|
|
||
| func readConfig() (proxy.Config, error) { | ||
| config := proxy.Config{} | ||
| viper.AddConfigPath("$HOME/.config/shutter") | ||
| viper.SetConfigName("proxy") | ||
| viper.SetConfigType("toml") | ||
| viper.SetConfigFile(cfgFile) | ||
| var err error | ||
| err = viper.ReadInConfig() | ||
| if _, ok := err.(viper.ConfigFileNotFoundError); ok { | ||
| // Config file not found | ||
| if cfgFile != "" { | ||
| return config, err | ||
| } | ||
| } else if err != nil { | ||
| return config, err // Config file was found but another error was produced | ||
| } | ||
| err = config.Unmarshal(viper.GetViper()) | ||
| return config, err | ||
| } | ||
|
|
||
| func proxyMain() error { | ||
| log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stderr}) | ||
|
|
||
| config, err := readConfig() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| log.Info().Msgf("Starting shutter proxy version %s", shversion.Version()) | ||
|
|
||
| ctx, cancel := context.WithCancel(context.Background()) | ||
| defer cancel() | ||
| termChan := make(chan os.Signal, 1) | ||
| signal.Notify(termChan, syscall.SIGINT, syscall.SIGTERM) | ||
| go func() { | ||
| sig := <-termChan | ||
| log.Info().Str("signal", sig.String()).Msg("Received signal, shutting down") | ||
| cancel() | ||
| }() | ||
|
|
||
| err = proxy.Run(ctx, config) | ||
| if err == context.Canceled { | ||
| log.Info().Msg("Bye.") | ||
| return nil | ||
| } | ||
| return err | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| // Package proxy contains a jsonrpc proxy implementation. | ||
| package proxy | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "encoding/json" | ||
| "io" | ||
| "net/http" | ||
| "net/http/httputil" | ||
| "net/url" | ||
| "time" | ||
|
|
||
| "github.com/go-chi/chi/v5" | ||
| "github.com/mitchellh/mapstructure" | ||
| "github.com/rs/zerolog/log" | ||
| "github.com/spf13/viper" | ||
| "golang.org/x/sync/errgroup" | ||
|
|
||
| "github.com/shutter-network/shutter/shuttermint/medley" | ||
| ) | ||
|
|
||
| type RPCRequest struct { | ||
| Version string `json:"jsonrpc"` | ||
| Method string `json:"method,omitempty"` | ||
| Params interface{} `json:"params,omitempty"` | ||
| ID interface{} `json:"id,omitempty"` | ||
| } | ||
|
|
||
| type Config struct { | ||
| CollatorURL, SequencerURL *url.URL | ||
| HTTPListenAddress string | ||
| } | ||
|
|
||
| func (config *Config) Unmarshal(v *viper.Viper) error { | ||
| err := v.Unmarshal(config, viper.DecodeHook( | ||
| mapstructure.ComposeDecodeHookFunc( | ||
| medley.StringToURL, | ||
| ))) | ||
| return err | ||
| } | ||
|
|
||
| type JSONRPCProxy struct { | ||
| collator, sequencer *httputil.ReverseProxy | ||
| } | ||
|
|
||
| func (p *JSONRPCProxy) SelectReverseProxy(method string) *httputil.ReverseProxy { | ||
| switch method { | ||
| case "eth_sendTransaction": | ||
| return p.collator | ||
| case "eth_sendRawTransaction": | ||
| return p.collator | ||
| default: | ||
| return p.sequencer | ||
| } | ||
| } | ||
|
|
||
| func (p *JSONRPCProxy) HandleRequest(w http.ResponseWriter, r *http.Request) { | ||
| body, err := io.ReadAll(r.Body) | ||
| if err != nil { | ||
| http.Error(w, "Bad request", http.StatusBadRequest) | ||
| return | ||
| } | ||
| rpcreq := RPCRequest{} | ||
| err = json.Unmarshal(body, &rpcreq) | ||
| if err != nil { | ||
| http.Error(w, "Bad request", http.StatusBadRequest) | ||
| return | ||
| } | ||
| log.Info().Str("method", rpcreq.Method).Msg("dispatching") | ||
|
|
||
| // make the body available again before letting reverse proxy handle the rest | ||
| r.Body = io.NopCloser(bytes.NewBuffer(body)) | ||
| p.SelectReverseProxy(rpcreq.Method).ServeHTTP(w, r) | ||
| } | ||
|
|
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| func Run(ctx context.Context, config Config) error { | ||
| p := JSONRPCProxy{ | ||
| collator: httputil.NewSingleHostReverseProxy(config.CollatorURL), | ||
| sequencer: httputil.NewSingleHostReverseProxy(config.SequencerURL), | ||
| } | ||
| router := chi.NewRouter() | ||
| router.Post("/*", p.HandleRequest) | ||
|
|
||
| httpServer := &http.Server{ | ||
| Addr: config.HTTPListenAddress, | ||
| Handler: router, | ||
| } | ||
| errorgroup, errorctx := errgroup.WithContext(ctx) | ||
| errorgroup.Go(httpServer.ListenAndServe) | ||
| errorgroup.Go(func() error { | ||
| <-errorctx.Done() | ||
| shutdownCtx, cancel := context.WithTimeout(context.Background(), 2*time.Second) | ||
| defer cancel() | ||
| return httpServer.Shutdown(shutdownCtx) | ||
| }) | ||
| return errorgroup.Wait() | ||
| } |