neo-go/scripts/compare-states/compare-states.go

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package main
import (
"context"
"errors"
"fmt"
"os"
"github.com/davecgh/go-spew/spew"
"github.com/nspcc-dev/neo-go/pkg/rpc/client"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/pmezard/go-difflib/difflib"
"github.com/urfave/cli"
)
func initClient(addr string, name string) (*client.Client, uint32, error) {
c, err := client.New(context.Background(), addr, client.Options{})
if err != nil {
return nil, 0, fmt.Errorf("RPC %s: %w", name, err)
}
err = c.Init()
if err != nil {
return nil, 0, fmt.Errorf("RPC %s init: %w", name, err)
}
h, err := c.GetBlockCount()
if err != nil {
return nil, 0, fmt.Errorf("RPC %s block count: %w", name, err)
}
return c, h, nil
}
func getRoots(ca *client.Client, cb *client.Client, h uint32) (util.Uint256, util.Uint256, error) {
ra, err := ca.GetStateRootByHeight(h)
if err != nil {
return util.Uint256{}, util.Uint256{}, fmt.Errorf("getstateroot from A for %d: %w", h, err)
}
rb, err := cb.GetStateRootByHeight(h)
if err != nil {
return util.Uint256{}, util.Uint256{}, fmt.Errorf("getstateroot from B for %d: %w", h, err)
}
return ra.Root, rb.Root, nil
}
func bisectState(ca *client.Client, cb *client.Client, h uint32) (uint32, error) {
ra, rb, err := getRoots(ca, cb, 0)
if err != nil {
return 0, err
}
fmt.Printf("at %d: %s vs %s\n", 0, ra.StringLE(), rb.StringLE())
if ra != rb {
return 0, nil
}
good := uint32(0)
ra, rb, err = getRoots(ca, cb, h)
if err != nil {
return 0, err
}
fmt.Printf("at %d: %s vs %s\n", h, ra.StringLE(), rb.StringLE())
if ra.Equals(rb) {
return 0, fmt.Errorf("state matches at %d", h)
}
bad := h
for bad-good > 1 {
next := good + (bad-good)/2
ra, rb, err = getRoots(ca, cb, next)
if err != nil {
return 0, err
}
fmt.Printf("at %d: %s vs %s\n", next, ra.StringLE(), rb.StringLE())
if ra == rb {
good = next
} else {
bad = next
}
}
return bad, nil
}
func cliMain(c *cli.Context) error {
a := c.Args().Get(0)
b := c.Args().Get(1)
if a == "" {
return errors.New("no arguments given")
}
if b == "" {
return errors.New("missing second argument")
}
ca, ha, err := initClient(a, "A")
if err != nil {
return err
}
cb, hb, err := initClient(b, "B")
if err != nil {
return err
}
if ha != hb {
return errors.New("chains have different heights")
}
h, err := bisectState(ca, cb, ha-1)
if err != nil {
return err
}
blk, err := ca.GetBlockByIndex(h)
if err != nil {
return err
}
fmt.Printf("state differs at %d, block %s\n", h, blk.Hash().StringLE())
for _, t := range blk.Transactions {
fmt.Printf("transaction %s:\n", t.Hash().StringLE())
la, err := ca.GetApplicationLog(t.Hash(), nil)
if err != nil {
return err
}
lb, err := cb.GetApplicationLog(t.Hash(), nil)
if err != nil {
return err
}
da := spew.Sdump(la)
db := spew.Sdump(lb)
diff, _ := difflib.GetUnifiedDiffString(difflib.UnifiedDiff{
A: difflib.SplitLines(da),
B: difflib.SplitLines(db),
FromFile: a,
FromDate: "",
ToFile: b,
ToDate: "",
Context: 1,
})
fmt.Println(diff)
}
return nil
}
func main() {
ctl := cli.NewApp()
ctl.Name = "compare-states"
ctl.Version = "1.0"
ctl.Usage = "compare-states RPC_A RPC_B"
ctl.Action = cliMain
if err := ctl.Run(os.Args); err != nil {
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, ctl.Usage)
os.Exit(1)
}
}