lotus/cli/chain.go

package cli

import (
	"encoding/json"
	"fmt"

	"gopkg.in/urfave/cli.v2"

	"github.com/filecoin-project/go-lotus/chain"
	cid "github.com/ipfs/go-cid"
)

var chainCmd = &cli.Command{
	Name:  "chain",
	Usage: "Interact with filecoin blockchain",
	Subcommands: []*cli.Command{
		chainHeadCmd,
		chainGetBlock,
	},
}

var chainHeadCmd = &cli.Command{
	Name:  "head",
	Usage: "Print chain head",
	Action: func(cctx *cli.Context) error {
		api, err := getAPI(cctx)
		if err != nil {
			return err
		}
		ctx := reqContext(cctx)

		head, err := api.ChainHead(ctx)
		if err != nil {
			return err
		}

		for _, c := range head.Cids() {
			fmt.Println(c)
		}
		return nil
	},
}

var chainGetBlock = &cli.Command{
	Name:  "getblock",
	Usage: "Get a block and print its details",
	Flags: []cli.Flag{
		&cli.BoolFlag{
			Name:  "raw",
			Usage: "print just the raw block header",
		},
	},
	Action: func(cctx *cli.Context) error {
		api, err := getAPI(cctx)
		if err != nil {
			return err
		}
		ctx := reqContext(cctx)

		if !cctx.Args().Present() {
			return fmt.Errorf("must pass cid of block to print")
		}

		bcid, err := cid.Decode(cctx.Args().First())
		if err != nil {
			return err
		}

		blk, err := api.ChainGetBlock(ctx, bcid)
		if err != nil {
			return err
		}

		if cctx.Bool("raw") {
			out, err := json.MarshalIndent(blk, "", "  ")
			if err != nil {
				return err
			}

			fmt.Println(string(out))
			return nil
		}

		msgs, err := api.ChainGetBlockMessages(ctx, bcid)
		if err != nil {
			return err
		}

		cblock := struct {
			chain.BlockHeader
			Messages []*chain.SignedMessage
		}{}

		cblock.BlockHeader = *blk
		cblock.Messages = msgs

		out, err := json.MarshalIndent(cblock, "", "  ")
		if err != nil {
			return err
		}

		fmt.Println(string(out))
		return nil

	},
}