From 0d8a3cbaf848d15169f25bff0920d3c804b1b186 Mon Sep 17 00:00:00 2001
From: Aayush <arajasek94@gmail.com>
Date: Wed, 26 Apr 2023 10:07:52 -0400
Subject: [PATCH] feat: shed tool to report on any consensus mismatches in
 history

---
 cmd/lotus-shed/main.go       |  1 +
 cmd/lotus-shed/mismatches.go | 53 ++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)
 create mode 100644 cmd/lotus-shed/mismatches.go

diff --git a/cmd/lotus-shed/main.go b/cmd/lotus-shed/main.go
index 1f4d953f9..9cb1cd32c 100644
--- a/cmd/lotus-shed/main.go
+++ b/cmd/lotus-shed/main.go
@@ -86,6 +86,7 @@ func main() {
 		replayOfflineCmd,
 		msgindexCmd,
 		FevmAnalyticsCmd,
+		mismatchesCmd,
 	}
 
 	app := &cli.App{
diff --git a/cmd/lotus-shed/mismatches.go b/cmd/lotus-shed/mismatches.go
new file mode 100644
index 000000000..8dd1be352
--- /dev/null
+++ b/cmd/lotus-shed/mismatches.go
@@ -0,0 +1,53 @@
+package main
+
+import (
+	"fmt"
+
+	lcli "github.com/filecoin-project/lotus/cli"
+	"github.com/urfave/cli/v2"
+)
+
+var mismatchesCmd = &cli.Command{
+	Name:        "mismatches",
+	Description: "Walk up the chain, recomputing state, and reporting any mismatches",
+	Action: func(cctx *cli.Context) error {
+		srv, err := lcli.GetFullNodeServices(cctx)
+		if err != nil {
+			return err
+		}
+		defer srv.Close() //nolint:errcheck
+
+		api := srv.FullNodeAPI()
+		ctx := lcli.ReqContext(cctx)
+
+		checkTs, err := api.ChainHead(ctx)
+		if err != nil {
+			return err
+		}
+
+		for checkTs.Height() != 0 {
+			if checkTs.Height()%10000 == 0 {
+				fmt.Println("Reached height ", checkTs.Height())
+			}
+
+			execTsk := checkTs.Parents()
+			execTs, err := api.ChainGetTipSet(ctx, execTsk)
+			if err != nil {
+				return err
+			}
+
+			st, err := api.StateCompute(ctx, execTs.Height(), nil, execTsk)
+			if err != nil {
+				return err
+			}
+
+			if st.Root != checkTs.ParentState() {
+				fmt.Println("consensus mismatch found at height ", execTs.Height())
+			}
+
+			checkTs = execTs
+		}
+
+		return nil
+	},
+}