add a getblock command

api/api.go

@@ -39,6 +39,8 @@ type API interface {
 	ChainSubmitBlock(ctx context.Context, blk *chain.BlockMsg) error // TODO: check serialization
 	ChainGetRandomness(context.Context, *chain.TipSet) ([]byte, error)
 	ChainWaitMsg(context.Context, cid.Cid) (*MsgWait, error)
+	ChainGetBlock(context.Context, cid.Cid) (*chain.BlockHeader, error)
+	ChainGetBlockMessages(context.Context, cid.Cid) ([]*chain.SignedMessage, error)
 
 	// messages
 

api/struct.go

@@ -17,10 +17,12 @@ type Struct struct {
 		ID      func(context.Context) (peer.ID, error)
 		Version func(context.Context) (Version, error)
 
-		ChainSubmitBlock   func(ctx context.Context, blk *chain.BlockMsg) error
-		ChainHead          func(context.Context) (*chain.TipSet, error)
-		ChainGetRandomness func(context.Context, *chain.TipSet) ([]byte, error)
-		ChainWaitMsg       func(context.Context, cid.Cid) (*MsgWait, error)
+		ChainSubmitBlock      func(ctx context.Context, blk *chain.BlockMsg) error
+		ChainHead             func(context.Context) (*chain.TipSet, error)
+		ChainGetRandomness    func(context.Context, *chain.TipSet) ([]byte, error)
+		ChainWaitMsg          func(context.Context, cid.Cid) (*MsgWait, error)
+		ChainGetBlock         func(context.Context, cid.Cid) (*chain.BlockHeader, error)
+		ChainGetBlockMessages func(context.Context, cid.Cid) ([]*chain.SignedMessage, error)
 
 		MpoolPending func(context.Context, *chain.TipSet) ([]*chain.SignedMessage, error)
 		MpoolPush    func(context.Context, *chain.SignedMessage) error
@@ -130,4 +132,12 @@ func (c *Struct) MpoolGetNonce(ctx context.Context, addr address.Address) (uint6
 	return c.Internal.MpoolGetNonce(ctx, addr)
 }
 
+func (c *Struct) ChainGetBlock(ctx context.Context, b cid.Cid) (*chain.BlockHeader, error) {
+	return c.Internal.ChainGetBlock(ctx, b)
+}
+
+func (c *Struct) ChainGetBlockMessages(ctx context.Context, b cid.Cid) ([]*chain.SignedMessage, error) {
+	return c.Internal.ChainGetBlockMessages(ctx, b)
+}
+
 var _ API = &Struct{}

chain/address/address.go

@@ -5,7 +5,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"strconv"
-	"strings"
 
 	"github.com/filecoin-project/go-bls-sigs"
 	"github.com/filecoin-project/go-leb128"
@@ -106,8 +105,12 @@ func (a Address) Marshal() ([]byte, error) {
 
 // UnmarshalJSON implements the json unmarshal interface.
 func (a *Address) UnmarshalJSON(b []byte) error {
-	in := strings.TrimSuffix(strings.TrimPrefix(string(b), `"`), `"`)
-	addr, err := decode(in)
+	var s string
+	if err := json.Unmarshal(b, &s); err != nil {
+		return err
+	}
+
+	addr, err := decode(s)
 	if err != nil {
 		return err
 	}
@@ -117,7 +120,7 @@ func (a *Address) UnmarshalJSON(b []byte) error {
 
 // MarshalJSON implements the json marshal interface.
 func (a Address) MarshalJSON() ([]byte, error) {
-	return json.Marshal(a.String())
+	return []byte(`"` + a.String() + `"`), nil
 }
 
 // Format implements the Formatter interface.

cli/chain.go

@@ -1,9 +1,13 @@
 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{
@@ -11,6 +15,7 @@ var chainCmd = &cli.Command{
 	Usage: "Interact with filecoin blockchain",
 	Subcommands: []*cli.Command{
 		chainHeadCmd,
+		chainGetBlock,
 	},
 }
 
@@ -35,3 +40,67 @@ var chainHeadCmd = &cli.Command{
 		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
+
+	},
+}

go.mod

@@ -67,6 +67,7 @@ require (
 	go4.org v0.0.0-20190313082347-94abd6928b1d // indirect
 	golang.org/x/sync v0.0.0-20190423024810-112230192c58 // indirect
 	golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7
+	google.golang.org/appengine v1.4.0 // indirect
 	gopkg.in/urfave/cli.v2 v2.0.0-20180128182452-d3ae77c26ac8
 	launchpad.net/gocheck v0.0.0-20140225173054-000000000087 // indirect
 )

node/api.go

@@ -55,6 +55,19 @@ func (a *API) ChainWaitMsg(ctx context.Context, msg cid.Cid) (*api.MsgWait, erro
 	panic("TODO")
 }
 
+func (a *API) ChainGetBlock(ctx context.Context, msg cid.Cid) (*chain.BlockHeader, error) {
+	return a.Chain.GetBlock(msg)
+}
+
+func (a *API) ChainGetBlockMessages(ctx context.Context, msg cid.Cid) ([]*chain.SignedMessage, error) {
+	b, err := a.Chain.GetBlock(msg)
+	if err != nil {
+		return nil, err
+	}
+
+	return a.Chain.MessagesForBlock(b)
+}
+
 func (a *API) ID(context.Context) (peer.ID, error) {
 	return a.Host.ID(), nil
 }