From 5f1da94971feed8874a3fca8eedbaf44404c01a1 Mon Sep 17 00:00:00 2001
From: whyrusleeping <why@ipfs.io>
Date: Wed, 22 Jul 2020 19:30:51 -0700
Subject: [PATCH] implement method and parameter specification for send

---
 cli/send.go | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/cli/send.go b/cli/send.go
index ce7879a97..12c16ece3 100644
--- a/cli/send.go
+++ b/cli/send.go
@@ -1,11 +1,20 @@
 package cli
 
 import (
+	"bytes"
+	"context"
+	"encoding/hex"
+	"encoding/json"
 	"fmt"
+	"reflect"
 
 	"github.com/filecoin-project/go-address"
+	"github.com/filecoin-project/lotus/api"
+	"github.com/filecoin-project/lotus/chain/stmgr"
 	"github.com/filecoin-project/lotus/chain/types"
+	"github.com/filecoin-project/specs-actors/actors/abi"
 	"github.com/urfave/cli/v2"
+	cbg "github.com/whyrusleeping/cbor-gen"
 )
 
 var sendCmd = &cli.Command{
@@ -27,6 +36,19 @@ var sendCmd = &cli.Command{
 			Usage: "specify the nonce to use",
 			Value: -1,
 		},
+		&cli.Uint64Flag{
+			Name:  "method",
+			Usage: "specify method to invoke",
+			Value: 0,
+		},
+		&cli.StringFlag{
+			Name:  "params-json",
+			Usage: "specify invocation parameters in json",
+		},
+		&cli.StringFlag{
+			Name:  "params-hex",
+			Usage: "specify invocation parameters in hex",
+		},
 	},
 	Action: func(cctx *cli.Context) error {
 		api, closer, err := GetFullNodeAPI(cctx)
@@ -73,11 +95,34 @@ var sendCmd = &cli.Command{
 			return err
 		}
 
+		method := abi.MethodNum(cctx.Uint64("method"))
+
+		var params []byte
+		if cctx.IsSet("params-json") {
+			decparams, err := decodeTypedParams(ctx, api, toAddr, method, cctx.String("params-json"))
+			if err != nil {
+				return fmt.Errorf("failed to decode json params: %w", err)
+			}
+			params = decparams
+		}
+		if cctx.IsSet("params-hex") {
+			if params != nil {
+				return fmt.Errorf("can only specify one of 'params-json' and 'params-hex'")
+			}
+			decparams, err := hex.DecodeString(cctx.String("params-hex"))
+			if err != nil {
+				return fmt.Errorf("failed to decode hex params: %w", err)
+			}
+			params = decparams
+		}
+
 		msg := &types.Message{
 			From:     fromAddr,
 			To:       toAddr,
 			Value:    types.BigInt(val),
 			GasPrice: gp,
+			Method:   method,
+			Params:   params,
 		}
 
 		if cctx.Int64("nonce") > 0 {
@@ -103,3 +148,22 @@ var sendCmd = &cli.Command{
 		return nil
 	},
 }
+
+func decodeTypedParams(ctx context.Context, fapi api.FullNode, to address.Address, method abi.MethodNum, paramstr string) ([]byte, error) {
+	act, err := fapi.StateGetActor(ctx, to, types.EmptyTSK)
+	if err != nil {
+		return nil, err
+	}
+
+	p := reflect.New(stmgr.MethodsMap[act.Code][method].Params.Elem()).Interface().(cbg.CBORMarshaler)
+
+	if err := json.Unmarshal([]byte(paramstr), p); err != nil {
+		return nil, fmt.Errorf("unmarshaling input into params type: %w", err)
+	}
+
+	buf := new(bytes.Buffer)
+	if err := p.MarshalCBOR(buf); err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}