sched: Interactive RPC Shell

cmd/lotus-shed/main.go

@@ -47,6 +47,7 @@ func main() {
 		sectorsCmd,
 		msgCmd,
 		electionCmd,
+		rpcCmd,
 	}
 
 	app := &cli.App{

cmd/lotus-shed/rpc.go

@@ -0,0 +1,133 @@
+package main
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"strings"
+	"text/scanner"
+
+	"github.com/chzyer/readline"
+	"github.com/urfave/cli/v2"
+	"golang.org/x/xerrors"
+
+	lcli "github.com/filecoin-project/lotus/cli"
+	"github.com/filecoin-project/lotus/node/repo"
+)
+
+var rpcCmd = &cli.Command{
+	Name:  "rpc",
+	Usage: "Interactive JsonPRC shell",
+	// TODO: flag for miner/worker
+	Action: func(cctx *cli.Context) error {
+		addr, headers, err := lcli.GetRawAPI(cctx, repo.FullNode)
+		if err != nil {
+			return err
+		}
+
+		u, err := url.Parse(addr)
+		if err != nil {
+			return xerrors.Errorf("parsing api URL: %w", err)
+		}
+
+		switch u.Scheme {
+		case "ws":
+			u.Scheme = "http"
+		case "wss":
+			u.Scheme = "https"
+		}
+
+		addr = u.String()
+
+		ctx := lcli.ReqContext(cctx)
+		ctx, cancel := context.WithCancel(ctx)
+		defer cancel()
+		afmt := lcli.NewAppFmt(cctx.App)
+
+		cs := readline.NewCancelableStdin(afmt.Stdin)
+		go func() {
+			<-ctx.Done()
+			cs.Close() // nolint:errcheck
+		}()
+
+		cctx.App.Metadata["repoType"] = repo.FullNode
+		if err := lcli.VersionCmd.Action(cctx); err != nil {
+			return err
+		}
+		fmt.Println("Usage: > Method [Param1, Param2, ...]")
+
+		rl, err := readline.NewEx(&readline.Config{
+			Stdin:             cs,
+			HistoryFile:       "/tmp/lotusrpc.tmp",
+			Prompt:            "> ",
+			EOFPrompt:         "exit",
+			HistorySearchFold: true,
+
+			// TODO: Some basic auto completion
+		})
+		if err != nil {
+			return err
+		}
+
+		for {
+			line, err := rl.Readline()
+			if err == readline.ErrInterrupt {
+				if len(line) == 0 {
+					break
+				} else {
+					continue
+				}
+			} else if err == io.EOF {
+				break
+			}
+
+			var s scanner.Scanner
+			s.Init(strings.NewReader(line))
+			s.Scan()
+			method := s.TokenText()
+
+			s.Scan()
+			params := line[s.Position.Offset:]
+
+			jreq, err := json.Marshal(struct {
+				Jsonrpc string          `json:"jsonrpc"`
+				ID      int             `json:"id"`
+				Method  string          `json:"method"`
+				Params  json.RawMessage `json:"params"`
+			}{
+				Jsonrpc: "2.0",
+				Method:  "Filecoin." + method,
+				Params:  json.RawMessage(params),
+				ID:      0,
+			})
+
+			req, err := http.NewRequest("POST", addr, bytes.NewReader(jreq))
+			if err != nil {
+				return err
+			}
+			req.Header = headers
+			resp, err := http.DefaultClient.Do(req)
+			if err != nil {
+				return err
+			}
+
+			rb, err := ioutil.ReadAll(resp.Body)
+			if err != nil {
+				return err
+			}
+
+			fmt.Println(string(rb))
+
+			if err := resp.Body.Close(); err != nil {
+				return err
+			}
+		}
+
+		return nil
+	},
+}