lotus/cli/state.go

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package cli
import (
"bytes"
"context"
"encoding/json"
"fmt"
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"github.com/filecoin-project/specs-actors/actors/builtin"
"reflect"
"strconv"
"strings"
"github.com/filecoin-project/go-address"
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"github.com/filecoin-project/specs-actors/actors/abi"
"github.com/filecoin-project/specs-actors/actors/builtin/market"
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miner2 "github.com/filecoin-project/specs-actors/actors/builtin/miner"
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samsig "github.com/filecoin-project/specs-actors/actors/builtin/multisig"
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"github.com/filecoin-project/specs-actors/actors/builtin/paych"
"github.com/filecoin-project/specs-actors/actors/builtin/power"
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"github.com/libp2p/go-libp2p-core/peer"
"golang.org/x/xerrors"
"github.com/filecoin-project/lotus/api"
"github.com/filecoin-project/lotus/chain/types"
"github.com/filecoin-project/lotus/miner"
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"github.com/docker/go-units"
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"github.com/ipfs/go-cid"
cbg "github.com/whyrusleeping/cbor-gen"
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"gopkg.in/urfave/cli.v2"
)
var stateCmd = &cli.Command{
Name: "state",
Usage: "Interact with and query filecoin chain state",
Flags: []cli.Flag{
&cli.StringFlag{
Name: "tipset",
Usage: "specify tipset to call method on (pass comma separated array of cids)",
},
},
Subcommands: []*cli.Command{
statePowerCmd,
stateSectorsCmd,
stateProvingSetCmd,
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statePledgeCollateralCmd,
stateListActorsCmd,
stateListMinersCmd,
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stateGetActorCmd,
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stateLookupIDCmd,
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stateReplaySetCmd,
stateSectorSizeCmd,
stateReadStateCmd,
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stateListMessagesCmd,
stateComputeStateCmd,
stateCallCmd,
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stateGetDealSetCmd,
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stateWaitMsgCmd,
stateMinerInfo,
},
}
var stateMinerInfo = &cli.Command{
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Name: "miner-info",
Usage: "Retrieve miner information",
ArgsUsage: "[minerAddress]",
Action: func(cctx *cli.Context) error {
api, closer, err := GetFullNodeAPI(cctx)
if err != nil {
return err
}
defer closer()
ctx := ReqContext(cctx)
if !cctx.Args().Present() {
return fmt.Errorf("must specify miner to get information for")
}
addr, err := address.NewFromString(cctx.Args().First())
if err != nil {
return err
}
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ts, err := LoadTipSet(ctx, cctx, api)
if err != nil {
return err
}
act, err := api.StateGetActor(ctx, addr, ts.Key())
if err != nil {
return err
}
aso, err := api.ChainReadObj(ctx, act.Head)
if err != nil {
return err
}
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var mst miner2.State
if err := mst.UnmarshalCBOR(bytes.NewReader(aso)); err != nil {
return err
}
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mi := mst.Info
fmt.Printf("Owner:\t%s\n", mi.Owner)
fmt.Printf("Worker:\t%s\n", mi.Worker)
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fmt.Printf("PeerID:\t%s\n", mi.PeerId)
fmt.Printf("SectorSize:\t%s (%d)\n", units.BytesSize(float64(mi.SectorSize)), mi.SectorSize)
return nil
},
}
func parseTipSetString(cctx *cli.Context) ([]cid.Cid, error) {
ts := cctx.String("tipset")
if ts == "" {
return nil, nil
}
strs := strings.Split(ts, ",")
var cids []cid.Cid
for _, s := range strs {
c, err := cid.Parse(strings.TrimSpace(s))
if err != nil {
return nil, err
}
cids = append(cids, c)
}
return cids, nil
}
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func LoadTipSet(ctx context.Context, cctx *cli.Context, api api.FullNode) (*types.TipSet, error) {
cids, err := parseTipSetString(cctx)
if err != nil {
return nil, err
}
if len(cids) == 0 {
return nil, nil
}
k := types.NewTipSetKey(cids...)
ts, err := api.ChainGetTipSet(ctx, k)
if err != nil {
return nil, err
}
return ts, nil
}
var statePowerCmd = &cli.Command{
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Name: "power",
Usage: "Query network or miner power",
ArgsUsage: "[<minerAddress> (optional)]",
Action: func(cctx *cli.Context) error {
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api, closer, err := GetFullNodeAPI(cctx)
if err != nil {
return err
}
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defer closer()
ctx := ReqContext(cctx)
var maddr address.Address
if cctx.Args().Present() {
maddr, err = address.NewFromString(cctx.Args().First())
if err != nil {
return err
}
}
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ts, err := LoadTipSet(ctx, cctx, api)
if err != nil {
return err
}
power, err := api.StateMinerPower(ctx, maddr, ts.Key())
if err != nil {
return err
}
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tp := power.TotalPower
if cctx.Args().Present() {
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mp := power.MinerPower
percI := types.BigDiv(types.BigMul(mp, types.NewInt(1000000)), tp)
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fmt.Printf("%s(%s) / %s(%s) ~= %0.4f%%\n", mp.String(), types.SizeStr(mp), tp.String(), types.SizeStr(tp), float64(percI.Int64())/10000)
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} else {
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fmt.Printf("%s(%s)\n", tp.String(), types.SizeStr(tp))
}
return nil
},
}
var stateSectorsCmd = &cli.Command{
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Name: "sectors",
Usage: "Query the sector set of a miner",
ArgsUsage: "[minerAddress]",
Action: func(cctx *cli.Context) error {
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api, closer, err := GetFullNodeAPI(cctx)
if err != nil {
return err
}
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defer closer()
ctx := ReqContext(cctx)
if !cctx.Args().Present() {
return fmt.Errorf("must specify miner to list sectors for")
}
maddr, err := address.NewFromString(cctx.Args().First())
if err != nil {
return err
}
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ts, err := LoadTipSet(ctx, cctx, api)
if err != nil {
return err
}
sectors, err := api.StateMinerSectors(ctx, maddr, ts.Key())
if err != nil {
return err
}
for _, s := range sectors {
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fmt.Printf("%d: %x\n", s.Info.Info.SectorNumber, s.Info.Info.SealedCID)
}
return nil
},
}
var stateProvingSetCmd = &cli.Command{
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Name: "proving",
Usage: "Query the proving set of a miner",
ArgsUsage: "[minerAddress]",
Action: func(cctx *cli.Context) error {
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api, closer, err := GetFullNodeAPI(cctx)
if err != nil {
return err
}
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defer closer()
ctx := ReqContext(cctx)
if !cctx.Args().Present() {
return fmt.Errorf("must specify miner to list sectors for")
}
maddr, err := address.NewFromString(cctx.Args().First())
if err != nil {
return err
}
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ts, err := LoadTipSet(ctx, cctx, api)
if err != nil {
return err
}
sectors, err := api.StateMinerProvingSet(ctx, maddr, ts.Key())
if err != nil {
return err
}
for _, s := range sectors {
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fmt.Printf("%d: %x\n", s.Info.Info.SectorNumber, s.Info.Info.SealedCID)
}
return nil
},
}
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var stateReplaySetCmd = &cli.Command{
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Name: "replay",
Usage: "Replay a particular message within a tipset",
ArgsUsage: "[tipsetKey messageCid]",
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Action: func(cctx *cli.Context) error {
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if cctx.Args().Len() < 1 {
fmt.Println("usage: [tipset] <message cid>")
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fmt.Println("The last cid passed will be used as the message CID")
fmt.Println("All preceding ones will be used as the tipset")
return nil
}
args := cctx.Args().Slice()
mcid, err := cid.Decode(args[len(args)-1])
if err != nil {
return fmt.Errorf("message cid was invalid: %s", err)
}
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api, closer, err := GetFullNodeAPI(cctx)
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if err != nil {
return err
}
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defer closer()
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ctx := ReqContext(cctx)
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var ts *types.TipSet
{
var tscids []cid.Cid
for _, s := range args[:len(args)-1] {
c, err := cid.Decode(s)
if err != nil {
return fmt.Errorf("tipset cid was invalid: %s", err)
}
tscids = append(tscids, c)
}
if len(tscids) > 0 {
var headers []*types.BlockHeader
for _, c := range tscids {
h, err := api.ChainGetBlock(ctx, c)
if err != nil {
return err
}
headers = append(headers, h)
}
ts, err = types.NewTipSet(headers)
} else {
r, err := api.StateWaitMsg(ctx, mcid)
if err != nil {
return xerrors.Errorf("finding message in chain: %w", err)
}
ts, err = api.ChainGetTipSet(ctx, r.TipSet.Parents())
}
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if err != nil {
return err
}
}
res, err := api.StateReplay(ctx, ts.Key(), mcid)
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if err != nil {
return xerrors.Errorf("replay call failed: %w", err)
}
fmt.Println("Replay receipt:")
fmt.Printf("Exit code: %d\n", res.Receipt.ExitCode)
fmt.Printf("Return: %x\n", res.Receipt.Return)
fmt.Printf("Gas Used: %s\n", res.Receipt.GasUsed)
if res.Receipt.ExitCode != 0 {
fmt.Printf("Error message: %q\n", res.Error)
}
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return nil
},
}
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var statePledgeCollateralCmd = &cli.Command{
Name: "pledge-collateral",
Usage: "Get minimum miner pledge collateral",
Action: func(cctx *cli.Context) error {
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api, closer, err := GetFullNodeAPI(cctx)
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if err != nil {
return err
}
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defer closer()
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ctx := ReqContext(cctx)
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ts, err := LoadTipSet(ctx, cctx, api)
if err != nil {
return err
}
coll, err := api.StatePledgeCollateral(ctx, ts.Key())
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if err != nil {
return err
}
fmt.Println(types.FIL(coll))
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return nil
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},
}
var stateGetDealSetCmd = &cli.Command{
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Name: "get-deal",
Usage: "View on-chain deal info",
ArgsUsage: "[dealId]",
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Action: func(cctx *cli.Context) error {
api, closer, err := GetFullNodeAPI(cctx)
if err != nil {
return err
}
defer closer()
ctx := ReqContext(cctx)
if !cctx.Args().Present() {
return fmt.Errorf("must specify deal ID")
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}
dealid, err := strconv.ParseUint(cctx.Args().First(), 10, 64)
if err != nil {
return xerrors.Errorf("parsing deal ID: %w", err)
}
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ts, err := LoadTipSet(ctx, cctx, api)
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if err != nil {
return err
}
deal, err := api.StateMarketStorageDeal(ctx, abi.DealID(dealid), ts.Key())
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if err != nil {
return err
}
data, err := json.MarshalIndent(deal, "", " ")
if err != nil {
return err
}
fmt.Println(string(data))
return nil
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},
}
var stateListMinersCmd = &cli.Command{
Name: "list-miners",
Usage: "list all miners in the network",
Action: func(cctx *cli.Context) error {
api, closer, err := GetFullNodeAPI(cctx)
if err != nil {
return err
}
defer closer()
ctx := ReqContext(cctx)
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ts, err := LoadTipSet(ctx, cctx, api)
if err != nil {
return err
}
miners, err := api.StateListMiners(ctx, ts.Key())
if err != nil {
return err
}
for _, m := range miners {
fmt.Println(m.String())
}
return nil
},
}
var stateListActorsCmd = &cli.Command{
Name: "list-actors",
Usage: "list all actors in the network",
Action: func(cctx *cli.Context) error {
api, closer, err := GetFullNodeAPI(cctx)
if err != nil {
return err
}
defer closer()
ctx := ReqContext(cctx)
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ts, err := LoadTipSet(ctx, cctx, api)
if err != nil {
return err
}
actors, err := api.StateListActors(ctx, ts.Key())
if err != nil {
return err
}
for _, a := range actors {
fmt.Println(a.String())
}
return nil
},
}
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var stateGetActorCmd = &cli.Command{
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Name: "get-actor",
Usage: "Print actor information",
ArgsUsage: "[actorrAddress]",
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Action: func(cctx *cli.Context) error {
api, closer, err := GetFullNodeAPI(cctx)
if err != nil {
return err
}
defer closer()
ctx := ReqContext(cctx)
if !cctx.Args().Present() {
return fmt.Errorf("must pass address of actor to get")
}
addr, err := address.NewFromString(cctx.Args().First())
if err != nil {
return err
}
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ts, err := LoadTipSet(ctx, cctx, api)
if err != nil {
return err
}
a, err := api.StateGetActor(ctx, addr, ts.Key())
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if err != nil {
return err
}
fmt.Printf("Address:\t%s\n", addr)
fmt.Printf("Balance:\t%s\n", types.FIL(a.Balance))
fmt.Printf("Nonce:\t\t%d\n", a.Nonce)
fmt.Printf("Code:\t\t%s\n", a.Code)
fmt.Printf("Head:\t\t%s\n", a.Head)
return nil
},
}
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var stateLookupIDCmd = &cli.Command{
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Name: "lookup",
Usage: "Find corresponding ID address",
ArgsUsage: "[address]",
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Action: func(cctx *cli.Context) error {
api, closer, err := GetFullNodeAPI(cctx)
if err != nil {
return err
}
defer closer()
ctx := ReqContext(cctx)
if !cctx.Args().Present() {
return fmt.Errorf("must pass address of actor to get")
}
addr, err := address.NewFromString(cctx.Args().First())
if err != nil {
return err
}
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ts, err := LoadTipSet(ctx, cctx, api)
if err != nil {
return err
}
a, err := api.StateLookupID(ctx, addr, ts.Key())
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if err != nil {
return err
}
fmt.Printf("%s\n", a)
return nil
},
}
var stateSectorSizeCmd = &cli.Command{
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Name: "sector-size",
Usage: "Look up miners sector size",
ArgsUsage: "[minerAddress]",
Action: func(cctx *cli.Context) error {
api, closer, err := GetFullNodeAPI(cctx)
if err != nil {
return err
}
defer closer()
ctx := ReqContext(cctx)
if !cctx.Args().Present() {
return fmt.Errorf("must pass miner's address")
}
addr, err := address.NewFromString(cctx.Args().First())
if err != nil {
return err
}
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ts, err := LoadTipSet(ctx, cctx, api)
if err != nil {
return err
}
ssize, err := api.StateMinerSectorSize(ctx, addr, ts.Key())
if err != nil {
return err
}
fmt.Printf("%d\n", ssize)
return nil
},
}
var stateReadStateCmd = &cli.Command{
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Name: "read-state",
Usage: "View a json representation of an actors state",
ArgsUsage: "[actorAddress]",
Action: func(cctx *cli.Context) error {
api, closer, err := GetFullNodeAPI(cctx)
if err != nil {
return err
}
defer closer()
ctx := ReqContext(cctx)
if !cctx.Args().Present() {
return fmt.Errorf("must pass address of actor to get")
}
addr, err := address.NewFromString(cctx.Args().First())
if err != nil {
return err
}
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ts, err := LoadTipSet(ctx, cctx, api)
if err != nil {
return err
}
act, err := api.StateGetActor(ctx, addr, ts.Key())
if err != nil {
return err
}
as, err := api.StateReadState(ctx, act, ts.Key())
if err != nil {
return err
}
data, err := json.MarshalIndent(as.State, "", " ")
if err != nil {
return err
}
fmt.Println(string(data))
return nil
},
}
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var stateListMessagesCmd = &cli.Command{
Name: "list-messages",
Usage: "list messages on chain matching given criteria",
Flags: []cli.Flag{
&cli.StringFlag{
Name: "to",
Usage: "return messages to a given address",
},
&cli.StringFlag{
Name: "from",
Usage: "return messages from a given address",
},
&cli.Uint64Flag{
Name: "toheight",
Usage: "don't look before given block height",
},
&cli.BoolFlag{
Name: "cids",
Usage: "print message CIDs instead of messages",
},
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},
Action: func(cctx *cli.Context) error {
api, closer, err := GetFullNodeAPI(cctx)
if err != nil {
return err
}
defer closer()
ctx := ReqContext(cctx)
var toa, froma address.Address
if tos := cctx.String("to"); tos != "" {
a, err := address.NewFromString(tos)
if err != nil {
return fmt.Errorf("given 'to' address %q was invalid: %w", tos, err)
}
toa = a
}
if froms := cctx.String("from"); froms != "" {
a, err := address.NewFromString(froms)
if err != nil {
return fmt.Errorf("given 'from' address %q was invalid: %w", froms, err)
}
froma = a
}
toh := cctx.Uint64("toheight")
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ts, err := LoadTipSet(ctx, cctx, api)
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if err != nil {
return err
}
msgs, err := api.StateListMessages(ctx, &types.Message{To: toa, From: froma}, ts.Key(), abi.ChainEpoch(toh))
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if err != nil {
return err
}
for _, c := range msgs {
if cctx.Bool("cids") {
fmt.Println(c.String())
continue
}
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m, err := api.ChainGetMessage(ctx, c)
if err != nil {
return err
}
b, err := json.MarshalIndent(m, "", " ")
if err != nil {
return err
}
fmt.Println(string(b))
}
return nil
},
}
var stateComputeStateCmd = &cli.Command{
Name: "compute-state",
Usage: "Perform state computations",
Flags: []cli.Flag{
&cli.Uint64Flag{
Name: "height",
Usage: "set the height to compute state at",
},
&cli.BoolFlag{
Name: "apply-mpool-messages",
Usage: "apply messages from the mempool to the computed state",
},
},
Action: func(cctx *cli.Context) error {
api, closer, err := GetFullNodeAPI(cctx)
if err != nil {
return err
}
defer closer()
ctx := ReqContext(cctx)
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ts, err := LoadTipSet(ctx, cctx, api)
if err != nil {
return err
}
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h := abi.ChainEpoch(cctx.Uint64("height"))
if h == 0 {
if ts == nil {
head, err := api.ChainHead(ctx)
if err != nil {
return err
}
ts = head
}
h = ts.Height()
}
var msgs []*types.Message
if cctx.Bool("apply-mpool-messages") {
pmsgs, err := api.MpoolPending(ctx, ts.Key())
if err != nil {
return err
}
pmsgs, err = miner.SelectMessages(ctx, api.StateGetActor, ts, pmsgs)
if err != nil {
return err
}
for _, sm := range pmsgs {
msgs = append(msgs, &sm.Message)
}
}
nstate, err := api.StateCompute(ctx, h, msgs, ts.Key())
if err != nil {
return err
}
fmt.Println("computed state cid: ", nstate)
return nil
},
}
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var stateWaitMsgCmd = &cli.Command{
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Name: "wait-msg",
Usage: "Wait for a message to appear on chain",
ArgsUsage: "[messageCid]",
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Flags: []cli.Flag{
&cli.StringFlag{
Name: "timeout",
Value: "10m",
},
},
Action: func(cctx *cli.Context) error {
if !cctx.Args().Present() {
return fmt.Errorf("must specify message cid to wait for")
}
api, closer, err := GetFullNodeAPI(cctx)
if err != nil {
return err
}
defer closer()
ctx := ReqContext(cctx)
msg, err := cid.Decode(cctx.Args().First())
if err != nil {
return err
}
mw, err := api.StateWaitMsg(ctx, msg)
if err != nil {
return err
}
fmt.Printf("message was executed in tipset: %s", mw.TipSet.Cids())
fmt.Printf("Exit Code: %d", mw.Receipt.ExitCode)
fmt.Printf("Gas Used: %s", mw.Receipt.GasUsed)
fmt.Printf("Return: %x", mw.Receipt.Return)
return nil
},
}
var stateCallCmd = &cli.Command{
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Name: "call",
Usage: "Invoke a method on an actor locally",
ArgsUsage: "[toAddress methodId <param1 param2 ...> (optional)]",
Flags: []cli.Flag{
&cli.StringFlag{
Name: "from",
Usage: "",
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Value: builtin.SystemActorAddr.String(),
},
&cli.StringFlag{
Name: "value",
Usage: "specify value field for invocation",
Value: "0",
},
&cli.StringFlag{
Name: "ret",
Usage: "specify how to parse output (auto, raw, addr, big)",
Value: "auto",
},
},
Action: func(cctx *cli.Context) error {
if cctx.Args().Len() < 2 {
return fmt.Errorf("must specify at least actor and method to invoke")
}
api, closer, err := GetFullNodeAPI(cctx)
if err != nil {
return err
}
defer closer()
ctx := ReqContext(cctx)
toa, err := address.NewFromString(cctx.Args().First())
if err != nil {
return fmt.Errorf("given 'to' address %q was invalid: %w", cctx.Args().First(), err)
}
froma, err := address.NewFromString(cctx.String("from"))
if err != nil {
return fmt.Errorf("given 'from' address %q was invalid: %w", cctx.String("from"), err)
}
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ts, err := LoadTipSet(ctx, cctx, api)
if err != nil {
return err
}
method, err := strconv.ParseUint(cctx.Args().Get(1), 10, 64)
if err != nil {
return fmt.Errorf("must pass method as a number")
}
value, err := types.ParseFIL(cctx.String("value"))
if err != nil {
return fmt.Errorf("failed to parse 'value': %s", err)
}
act, err := api.StateGetActor(ctx, toa, ts.Key())
if err != nil {
return fmt.Errorf("failed to lookup target actor: %s", err)
}
params, err := parseParamsForMethod(act.Code, method, cctx.Args().Slice()[2:])
if err != nil {
return fmt.Errorf("failed to parse params: %s", err)
}
ret, err := api.StateCall(ctx, &types.Message{
From: froma,
To: toa,
Value: types.BigInt(value),
GasLimit: types.NewInt(10000000000),
GasPrice: types.NewInt(0),
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Method: abi.MethodNum(method),
Params: params,
}, ts.Key())
if err != nil {
return fmt.Errorf("state call failed: %s", err)
}
if ret.ExitCode != 0 {
return fmt.Errorf("invocation failed (exit: %d): %s", ret.ExitCode, ret.Error)
}
s, err := formatOutput(cctx.String("ret"), ret.Return)
if err != nil {
return fmt.Errorf("failed to format output: %s", err)
}
fmt.Printf("return: %s\n", s)
return nil
},
}
func formatOutput(t string, val []byte) (string, error) {
switch t {
case "raw", "hex":
return fmt.Sprintf("%x", val), nil
case "address", "addr", "a":
a, err := address.NewFromBytes(val)
if err != nil {
return "", err
}
return a.String(), nil
case "big", "int", "bigint":
bi := types.BigFromBytes(val)
return bi.String(), nil
case "fil":
bi := types.FIL(types.BigFromBytes(val))
return bi.String(), nil
case "pid", "peerid", "peer":
pid, err := peer.IDFromBytes(val)
if err != nil {
return "", err
}
return pid.Pretty(), nil
case "auto":
if len(val) == 0 {
return "", nil
}
a, err := address.NewFromBytes(val)
if err == nil {
return "address: " + a.String(), nil
}
pid, err := peer.IDFromBytes(val)
if err == nil {
return "peerID: " + pid.Pretty(), nil
}
bi := types.BigFromBytes(val)
return "bigint: " + bi.String(), nil
default:
return "", fmt.Errorf("unrecognized output type: %q", t)
}
}
func parseParamsForMethod(act cid.Cid, method uint64, args []string) ([]byte, error) {
if len(args) == 0 {
return nil, nil
}
var f interface{}
switch act {
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case builtin.StorageMarketActorCodeID:
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f = market.Actor{}.Exports()[method]
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case builtin.StorageMinerActorCodeID:
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f = miner2.Actor{}.Exports()[method]
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case builtin.StoragePowerActorCodeID:
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f = power.Actor{}.Exports()[method]
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case builtin.MultisigActorCodeID:
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f = samsig.Actor{}.Exports()[method]
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case builtin.PaymentChannelActorCodeID:
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f = paych.Actor{}.Exports()[method]
default:
return nil, fmt.Errorf("the lazy devs didnt add support for that actor to this call yet")
}
rf := reflect.TypeOf(f)
if rf.NumIn() != 3 {
return nil, fmt.Errorf("expected referenced method to have three arguments")
}
paramObj := rf.In(2).Elem()
if paramObj.NumField() != len(args) {
return nil, fmt.Errorf("not enough arguments given to call that method (expecting %d)", paramObj.NumField())
}
p := reflect.New(paramObj)
for i := 0; i < len(args); i++ {
switch paramObj.Field(i).Type {
case reflect.TypeOf(address.Address{}):
a, err := address.NewFromString(args[i])
if err != nil {
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return nil, fmt.Errorf("failed to parse address: %s", err)
}
p.Elem().Field(i).Set(reflect.ValueOf(a))
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case reflect.TypeOf(uint64(0)):
val, err := strconv.ParseUint(args[i], 10, 64)
if err != nil {
return nil, err
}
p.Elem().Field(i).Set(reflect.ValueOf(val))
case reflect.TypeOf(peer.ID("")):
pid, err := peer.IDB58Decode(args[i])
if err != nil {
return nil, fmt.Errorf("failed to parse peer ID: %s", err)
}
p.Elem().Field(i).Set(reflect.ValueOf(pid))
default:
return nil, fmt.Errorf("unsupported type for call (TODO): %s", paramObj.Field(i).Type)
}
}
m := p.Interface().(cbg.CBORMarshaler)
buf := new(bytes.Buffer)
if err := m.MarshalCBOR(buf); err != nil {
return nil, fmt.Errorf("failed to marshal param object: %s", err)
}
return buf.Bytes(), nil
}